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Wyświetlanie 1-100 z 1613
Tytuł:
Інноваційний розвиток інформаційної сфери
Innovative development of information
Autorzy:
Sazonets, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/692486.pdf
Data publikacji:
2012
Wydawca:
Dnieprowski Uniwersytet Narodowy im. Ołesia Honczara
Tematy:
інноваційні процеси
інформаційна сфера
інформаційне суспільство
міжнародна корпорація
innovation
information sector
information society
international corporation
Opis:
Innovation processes, research intensity of production in the economy of Ukraine and the world is studied. The analysis of the information field as innovation priority sectors is submitted. Development process of global information society is presented. Development prospects of information processes of society are given
Досліджено інноваційні процеси, наукоємність виробництва в економіці України та в світі. Наведено аналіз інформаційної сфери як інноваційно пріоритетної галузі економіки. Представлено процес розвитку глобального інформаційного суспільства. Окреслено перспективи розвитку процесів інформатизації суспільства.
Źródło:
European Journal of Management Issues; 2012, 1; 30-38
2519-8564
Pojawia się w:
European Journal of Management Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Earthworm species as pointer for herbaceous flora distribution and health of soil in Onigambari Forest Reserve, Oyo state Nigeria
Autorzy:
Onafurume, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1076651.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Earthworms
Floristic composition
Natural forest
Relative importance value
Soil fertility
Opis:
Amongst various and diverse organisms, earthworms (Annelida: Oligochaeta) are the most important components of soil biota when it comes to soil formation and maintenance of soil structure and fertility. The presence of earthworms modifies the soil quality of the environment due to their burrowing and casting. This affects the activities of other organisms. Thus, they are also termed “ecosystem engineers”. However, while we begin to understand the role of surface casts, it is still unclear to what extent plants utilize subsurface casts. This work is a study of the floral community structure as influenced by surface cast so as to determine the functional groups of earthworms in the natural forest zone of Onigambari Forest Reserve. This reserve is located at latitude 07°25’N and longitude 3°53’E within the low and semi-deciduous forest belt of Nigeria. It is divided into two: natural and plantation forests. Herein, the simple random sampling technique was used to select 10 geo-referenced plots (15m × 15m each). Three 1.0m × 1.0m square quadrats were randomly laid on each plot to give 30 sampling points surveyed for data collection. Data were collected on floral composition, relative importance values (RIV), earthworm composition and diversity, and physicochemical components of the soil. Twenty eight herbaceous plants were enumerated. Andropogon gayanus had the highest relative importance value (RIV) of (20.499), while Acroceras zizanoides and Platostoma africanum had the least RIV (1.1782) amongst other four. Seven earthworm species were enumerated, with Eisenia fetida having the highest RIV (28.571), while Octoclasion cyaneam and Lumbricum rubellus had the least. The species richness of earthworms was high (0.8061) and evenly distributed (0.8405), but with a low diversity (H’ = 1.772). There are two functional groups of earthworm in the natural forest zone, seven were surface dwelling, while only Lumbricus terrestris was sub-surface dwelling. The health of flora and soil of the natural forest zone of Onigambari forest reserve is low. Prevention of outside influence on the forest zone, seeding and deposition of organic waste matter to the soil are strategies that would enhance abundance and diversity of earthworms in the natural forest zone.
Źródło:
World News of Natural Sciences; 2019, 26; 80-95
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of electromagnetic radiation emitted by telecommunication equipment of transsmision centers
Wyznaczenie promieniowania elektromagnetycznego urządzeń komunikacyjnych centrów przesyłowych
Autorzy:
Naumchuk, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/407753.pdf
Data publikacji:
2013
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
wide spectral electromagnetic sources
cellular network
antenna
base station
frequency
spectral density
voltage
źródła różnoczęstotliwościowego promieniowania elektromagnetycznego
sieć komórkowa
antena
stacja bazowa
częstotliwość
gęstość spektralna
napięcie
Opis:
Determining and forecasting of environmental influence of telecommunication equipment that is a source of electromagnetic radiation is still an actual challenge. The approach proposed enables to assess an impact of wide spectral electromagnetic sources on environment as well as to elaborate practical means of minimizing their influence.
Wyznaczenie i prognozowanie wpływu urządzeń komunikacyjnych będących źródłami różnoczęstotliwościowego promieniowania elektromagnetycznego na otaczające środowisko jest problemem aktualnym. Zaproponowane podejście pozwala ocenić wpływ promieniowania elektromagnetycznego źródeł różnoczęstotliwościowych na otaczające środowisko i opracować praktyczne sposoby na jego zmniejszenie.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2013, 4; 74-76
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The participation of peroxidase in adaptation of plants to moderate water deficit
Udział peroksydaz w adaptacji roślin do warunków umiarkowanego deficytu wody
Autorzy:
Nedukha, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/797468.pdf
Data publikacji:
2006
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Opis:
The aim of this investigation was to study the localization and activity of peroxidase (EC. 1.11.1.7) in the leaves of Sium latifolium L. and interaction of peroxidase activity with lignin synthesis at moderate water deficit. The leaves of two ecological forms (ecotypes) in flowering phase were studied. S. latifolium air- aquatic ecotype grew in water (on the bank of Psel River, Ukraine), and terrestrial ecotype plant grew along the bank of this river under the conditions of moderate water deficit. The immunocytochemical and biochemical methods were used for the investigation. Peroxidase activity was estimated in chloroplasts of both palisade and spongy mesophyll and in cell walls of epidermis and mesophyll. The adaptation of S. latifolium plants to the moderate water deficit leads to the increase of guaiacol- and ascorbate peroxidase activities and lignin content in leaves, and also to the appearance of peroxidase in vacuoles.
Zbadano lokalizację i aktywności peroksydaz (EC. 1.11.1.7) w liściach Sium latifolium oraz określono interakcję pomiędzy aktywnością enzymu i syntezą lignin w warunkach umiarkowanego deficytu wody. Badania przeprowadzono na dwóch ekotypach S. latifolium w fazie kwitnienia roślin. Uprawę ekotypu powietrzno-wodnego prowadzono w wodzie, na brzegu rzeki Psel na Ukrainie, a ekotypu lądowego wzdłuż brzegu rzeki w warunkach umiarkowanego deficytu wody. Zasosowano immunocytochemiczne i biochemiczne metody analizy aktywności peroksydazy i zawartości lignin. Aktywność peroksydazy oznaczono w chloroplastach miękiszu palisadowego i gąbczastego oraz w ścianach komórkowych epidermy i mezofilu. Adaptacja S. latifolium do waruków umiarkowanego deficytu wody wiązała się ze wzrostem aktywności enzymów i zawartością lignin, a także pojawieniem się peroksydaz w wakuolach liści ekotypu lądowego.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2006, 509
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Історична ретроспектива феномену популізму та політичної демагогії
Historical Retrospective of the Phenomenon of Populism and Political Demagogy
Autorzy:
Цапко, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/22676559.pdf
Data publikacji:
2021-03-18
Wydawca:
National Academy of Sciences of Ukraine. Institute of World History
Tematy:
популізм
політична демагогія
апризм
жетулізм і піронізм
політична система
політиканство
корупція
націоналізм
populism
political demagoguery
aprism
jetulism and pyronism
political system
politicking
corruption
nationalism
Opis:
У статті дається узагальнююча характеристика феномену популізму та політичної демагогії через призму їхнього історичного розвитку. Автор звертає особливу увагу на розкритті сутності понять «популізм» та «політична демагогія», визначаючи при цьому їхні як спільні риси так і відмінності. Зокрема зазначається, що незважаючи на свою зовнішню схожість, популізм та демагогія не є тотожними. Так популізм передбачає значно менш негативний спосіб отримання популярності серед мас, ніж демагогія, оскільки демагоги спекулюють реальними проблемами своєї аудиторії, представляють події, погляди опонента у фальшивому світлі, вдаються до фальсифікації фактів. У сучасній політичній практиці популізм виступає набагато складнішим та неоднозначним явищем, а демагогія є лише одним із багатьох його інструментів і стратегій. У цьому аспекті близьким за змістом є поняття «політиканство», яке, разом із демагогією, є одним з негативних проявів популізму. У статті також здійснюється одна з перших спроб визначити основні періоди історичного розвитку популізму та політичної демагогії, визначаючи при цьому основні напрямки їхньої еволюції. Поряд з цим, досліджуючи популізм та політичну демагогію в історичній ретроспективі, можна також зробити висновок, що об’єктивні умови виникнення цих суспільно-політичних явищ були пов’язані із соціальною тенденцією, у відповідності до якої маси є лише об’єктом політики. Суб’єктивні передумови для виникнення та поширення популізму викликані недосконалістю відносин «панування-підпорядкування», домінуванням масового суспільства. В досліджені робиться узагальнюючий висновок, що функціонування та поширеність популізму і політичної демагогії у сучасних політичних системах характеризується його детермінованістю культурними, історичними, політичними особливостями країн.
The article gives a general description of the phenomenon of populism and political demagoguery through the prism of their historical development. The author pays special attention to the disclosure of the essence of the concepts of “populism” and “political demagoguery”, while defining their common features and differences. In particular, it is noted that despite their outward resemblance, populism and demagoguery are not identical. Thus, populism provides a much less negative way of gaining popularity among the masses than demagoguery, because demagogues speculate on the real problems of their audience, present events, views of the opponent in a false light, resort to falsification of facts. In modern political practice, populism is a much more complex and ambiguous phenomenon, and demagoguery is only one of its many tools and strategies. In this aspect, the concept of “politicking” is close in meaning, which, along with demagoguery, is one of the negative manifestations of populism. The article also makes one of the first attempts to identify the main periods of historical development of populism and political demagoguery, while determining the main directions of their evolution. At the same time, examining populism and political demagoguery in historical retrospect, we can also conclude that the objective conditions for the emergence of these socio-political phenomena were related to the social trend, according to which the masses are only the object of politics. Subjective preconditions for the emergence and spread of populism are caused by the imperfection of the relationship “domination – subordination”, the dominance of mass society. In general, the study concludes that the functioning and prevalence of populism and political demagoguery in modern political systems is characterized by its determinism of cultural, historical, political characteristics of countries.
Źródło:
Проблеми всесвітньої історії; 2021, 13; 10-23
2707-6776
Pojawia się w:
Проблеми всесвітньої історії
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Шведська традиція державної опіки над культурною спадщиною
The Swedish Tradition of State Care for Cultural Heritage
Autorzy:
Присяжнюк, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/22676762.pdf
Data publikacji:
2022-01-27
Wydawca:
National Academy of Sciences of Ukraine. Institute of World History
Tematy:
культурна спадщина
старожитності
пам’ятка
антикваріат
антиквар
державна опіка
музей
cultural heritage
antiquities
monument
state guardianship
museum
antiques
Opis:
Скандинавські країни відрізняються тим, що в них з досить давніх-давен застосовувалася розумна система піклування про пам’ятки старовини. Тут не було «законів» в точному сенсі – їх замінювали численні королівські декрети. Виданий у 1886 році декрет короля Швеції щодо покровительства та охорони пам’яток старовини переслідував ті ж цілі, що й звичайний парламентський акт про пам’ятники. Швеція, таким чином, перебувала в особливо щасливому положенні в тому сенсі, що тут вже здавна держава прийняла на себе охорону всіх старовинних пам’яток країни, причому було встановлено принцип, за яким пам’ятники та предмети, відкриті розкопками на приватній землі, не надходили в розпорядження власника, а складали предмет опіки держави. Наприкінці ХІХ ст. було неможливо встановити подібний принцип шляхом прямого законодавства, але в Швеції це було наслідком традиційного звичаю, що принесло пам’ятникам та їх охороні незліченну користь. В зв’язку з цим шведське законодавство в сфері охорони культурної спадщини вважається найстарішим у світі. Традиція державної опіки над історичними пам’ятками налічує вже близько чотирьох століть. На зорі цієї традиції у XVII та на початку XVIII століть відбувалося становлення централізованої шведської держави з великими імперськими амбіціями, важливу роль в обґрунтуванні яких грало історичне надбання. Друга половина XIX ст. стала поворотним моментом у справі охорони пам’яток, результатом чого стає Декрет 1867 р., який двічі доповнювався у 1873 та 1886 рр. В ньому відображено тенденції професіоналізації та централізації охорони пам’яток. Декретом було ускладнено механізм узгодження знесення пам’ятників в процесі господарських робіт. Був уточнений механізм надання права на дослідження археологічної спадщини. В цілому прогресивність шведських норм до початку ХХ ст. не може не викликати захоплення, хоча законодавство про охорону пам’яток повністю складалося з королівських розпоряджень. Комплексний закон з охорони пам'яток в Швеції був прийнятий тільки у 1942 р.
The Nordic countries are notable for their ancient practice of reasonable care of their historical monuments. There were no ‘laws’ in the strict sense – it was replaced by numerous royal decrees. The decree of the King of Sweden, made in 1886, about patronage and protection of antiquities had the same goals as the parliamentary act about monuments. Sweden is in a particularly good position, because the state has long since taken over the protection of all antiquities in the country and it has established the principle that monuments and artefacts uncovered by excavations on private land do not come under the custody of the owner, but are the subject of state care. At the end of the 19th century it was not possible to establish this principle by direct legislation, but in Sweden it was due to the traditional custom that monuments and their protection have been of incalculable benefit. In this regard, Swedish legislation on the protection of cultural heritage is considered the oldest in the world. The tradition of state care for historical monuments here goes back some four centuries. At the beginning of this tradition in the 17th and early 18th centuries, a centralized Swedish state with great imperial ambitions and an important role in justifying its historical patrimony was formed. The second half of the 19th century was a turning point in monument conservation, resulting in the 1867 decree, which was amended twice, in 1873 and 1886. It reflects the tendencies of professionalization and centralization of monument preservation. The decree complicated the mechanism of approving the demolition of monuments during economic works. The mechanism for granting the right to investigate archaeological heritage was clarified. The overall progressive nature of Swedish regulations by the beginning of the twentieth century cannot but inspire respect, even though the whole legislation on monument conservation was comprised of royal decrees. It was not until 1942 that the Comprehensive Swedish Monument Preservation Act was adopted.
Źródło:
Проблеми всесвітньої історії; 2022, 17; 183-196
2707-6776
Pojawia się w:
Проблеми всесвітньої історії
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plastic expression of modern and neo-classical architecture of Odessa. On examples of Odessa revenue houses built between 1910 and 1914
Autorzy:
Polonskaya, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/107101.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Rzeszowski. Wydział Biologiczno-Rolniczy
Tematy:
Modernism
rational Modern
Neoclassicism
plastic expression of architecture
modernizm
racjonalizm nowoczesny
neoklasycyzm
plastyczna ekspresja architektury
Opis:
The objective of the paper is to show the general formal principles in the Modern and Neoclassical architectural styles based on the examples of Odessa’s architecture of the early 20th century. The article provides an analysis of the plastic expression of Revenue Houses built at the beginning of 20th century. Two Revenue Houses were the subject of detailed analysis – Chernigov and Shestopal’s Revenue House built in1912, designed by Leonid M. Chernigov; and the Karaim Society’s Revenue House, by architect: A. S. Pampulov built in 1913. The parallel existence of two architectural styles, namely Modernism and Neoclassicism, at the beginning of the 20th century, allows to formulate certain formal principles. The analysis of exemplary Revenue Houses enabled to determine the formal principles belonging to the functional-constructive, the artistic-tectonic and the decorative-symbolic decoration. In addition, the impact of Modern style on neoclassical style was established. Despite formal stylistic contradictions and lack of homogeneity of forms and shapes in architecture of different stylistic schools the same formal principles are applied, which allows one to date a building to one epoch, a certain historical period of architecture’s development.
Źródło:
Topiarius. Studia krajobrazowe; 2017, 4; 109-113
2449-9595
2543-926X
Pojawia się w:
Topiarius. Studia krajobrazowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bio-insecticidal activity of Delonix regia oil extracts on maize weevil Sitophilus zeamais (Motschulsky, 1855) (Coleoptera: Curculionidae)
Autorzy:
Obembe, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1178504.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Bio-insecticide
Delonix regia
Lethal
Mortality
Sitophilus zeamais
Opis:
The maize weevil, Sitophilus zeamais (Coleoptera: Curculionidae) is one of the major pest infesting stored grains world wide. Experiments were conducted to study the efficacies of D. regia oils on mortality and adult emergence of S. zeamais Motschulsky. The long time storage and viability of the treated maize grains were also investigated. Results obtained showed that D. regia oil at every concentration was lethal on S. zeamais. At 1.0%, 1.5%, and 2.0% concentration, there was 100% mortality of S. zeamais at 96 h of exposure. The least potent extract was 0.5% concentration. The extracts drastically reduced adult emergence to 0.0% in grains treated with 1.5% and 2.0% oil extracts concentration. Grains treated with 1.0%, 1.5% and 2.0% D. regia seed oil completely prevented infestation and subsequence damage of the treated maize grains for a period of three Months. Thereafter, 20.04% damage was observed in grains treated with 0.5% oil extract. The oil extracts at all concentrations in this experiment hardly affected germination as there was no significant difference between percentage germination in the treated grains and the control. The results obtained reveal that oil extracts of D, regia seeds are effective in controlling S. zeamais and could serve as alternative to the controversial convectional chemical insecticides
Źródło:
World Scientific News; 2017, 70, 2; 86-96
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Między sacrum a profanum. Rola i znaczenie rzeźby nagrobnej w dobie renesansu : przyczynek do dalszych badań
Between sacrum and profanum. The role and significance of tomb sculpture of the renaissance : a contribution to further research
Autorzy:
Hajduk, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/398573.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
fundacja
sztuka funeralna
rzeźba kommemoratywna
rzeźba nagrobna
renesans polski
benefactors
funeral art
tomb sculpture
commemorative sculpture
Renaissance in Poland
Opis:
Renesansowe mauzolea rodowe, w których istotne miejsce zajmowały rzeźbiarskie struktury nagrobne, stanowiły miejsce styku tego, co święte, z tym, co świeckie, ich wypadkową były dzieła sztuki – rozpatrywane w kategorii piękna. Wiązały się one przede wszystkim z treściami eschatologicznymi. Obiekty te stały się, zgodnie z zamierzeniami fundatorów, miejscem pochówku ich oraz często członków rodziny. Poprzez swą formę i wyposażenie niosły ze sobą wielorakie treści, odwołując się do wątków religijnych, politycznych lub historycznych. Artykuł stanowi próbę osadzenia typu renesansowego pomnika nagrobnego w historycznej przestrzeni sakralnej w kontekście kategorii piękna z uwzględnieniem jego roli jako przekaźnika treści ideowych. Wskazuje także na aktualność tematu, w tym szczególnie na potrzebę powstania nowoczesnego opracowania o wymowie ideowej dzieł plastyki funeralnej.
Ancestral Renaissance mausoleums, which sculptural tomb structures took an important place in, were the point of meeting between the sacred with the profane, their outcome was a work of art – considered in the category of beauty. They were connected mainly with eschatological significance. These objects became, intended by the founder, his and often also his family members` burial place. Through its form and equipment they brought diverse meanings with them referring to the religious, political or historical topics. The article is an attempt to set the type of Renaissance tombstone in the historical context of sacred space in the category of beauty in the context of its role as an ideological meanings` transmitter. It also indicates the topicality of the subject, particularly the need for the creation of a modern study with ideological overtones of funeral art works.
Źródło:
Architecturae et Artibus; 2017, 9, 1; 14-23
2080-9638
Pojawia się w:
Architecturae et Artibus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of water deficit on the structural and functional organization of Sium latifolium leaf cells
Wpływ deficytu wody na strukturalną i funkcjonalną organizację komórek liści Sium latifolium
Autorzy:
Nedukha, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/807154.pdf
Data publikacji:
2006
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Opis:
The influence of water deficit on both the anatomical structure of leaves and mesophyll cell ultrastructure of Sium latifolium during flowering phase was studied. Moreover the analysis of chlorophyll, carotenoids and cellulose content was performed. A comparative light-microscopic analysis of leaf of S. latifolium of air-water and terrestrial ecotype showed the decrease of leaflets and cell size. Water deficit provoked the change of mesophyll cell ultrastructure, an appearance of destructive signs in chloroplasts, the decrease of content of chlorophylls, the increase of carotenoids and crystalline cellulose content in the leaves of terrestrial ecotype. The obtained results testify to the phenotypical plasticity of Sium latifolium leaves at flowering phase during the water deficit.
W pracy badano wpływ deficytu wody na anatomiczną strukturę liści oraz ultrastrukturę komórek mezofilu. Pomiary przeprowadzono na dwóch ekotypach Sium latifolium (ekotyp powietrzno-wodny i ekotyp lądowy) w fazie kwitnienia. Przeprowadzono mikroskopowe pomiary struktur liścia oraz biochemiczne analizy zawartości chlorofilu, karotenidów i cellulozy w liściach badanych ekotypów. Analizy mikroskopowe wykazały spadek liczby listków oraz zmniejszenie wielkości komórek u lądowego ekotypu S. latifolium. Ponadto deficyt wody wywołał zmiany w ultrastrukturze komórek mezofilu ekotypu lądowego, objawiające się strukturalnymi zmianami w chloroplastach, spadkiem zawartości chlorofilu, wzrostem zawartości karotenoidów i krystalicznej celulozy. Otrzymane wyniki świadczą o fenotypowej plastyczności liści Sium latifolium w warunkach deficytu wody.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2006, 509
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytochemical Study of Selected Medicinal plant, Solanum Nigrum, the Algerian Desert
Autorzy:
Djaafar, Z.
Ridha, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/412362.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Medicinal plants
Solamun Nigrum
Phytochemical analysis
Opis:
Solanum Nigrum plant contains many compounds of High utility, such as: alkaloids, saponin, and others. Through this study in the field of plant chemistry that we can know all the components of the various parts (leaves, twigs, flowers, fruits and roots) of the plant Solanum Nigrum, and enhance the classification of the operations during the disclosure of the components of the plant and contents of secondary metabolism and some of which adopted the newly particularly alkaloids and terpenes as genetic indicators.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 1; 25-30
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synteza liganda Sym-Phos {dicykloheksylo[3-(2,4,6-trimetoksyfenylo)-4-metoksynaft-2-yl]fosfina} i jego zastosowanie w reakcji Suzuki-Miyaura
Synthesis of Sym-Phos {dicyclohexyl-[3-(2,4,6-trimethoxyphenyl)-4-methoxynaphth-2-yl]phosphine} ligand and its application in Suzuki-Miyaura reaction
Autorzy:
Kielar, K.
Demchuk, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1217096.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
sprzęganie krzyżowe
C,P-kompleksowanie
ligandy fosfinowe
reakcja Suzuki-Miyaura
kataliza homogeniczna
kompleksy palladowe
cross-coupling
C,P-complexation
phosphorus ligand
Suzuki-Miyaura reaction
homogeneous catalysis
palladium complexes
Opis:
Przedstawiono tanią, szybką oraz wydajną trzyetapową syntezę odpornego na działanie powietrza ligandu Sym-Phos o C,P-typie kompleksowania. Sym-Phos tworzy skuteczne palladowe katalizatory, mające wykorzystanie w trudnych przypadkach reakcji sprzęgania krzyżowego, prowadzonych w przyjaznych środowisku warunkach (woda, otwarta kolba, umiarkowana temperatura).
We present cheap, quick and efficient three-phase synthesis of air-resistant Sym-Phos ligand {dicyclohexyl[3-(2,4,6-trimethoxyphenyl)-4-methoxynaphth-2-yl]phosphine} of C,P-type complexes. Sym-Phos creates effective palladium catalysts to be used in difficult cases of cross-coupling reactions carried out under favourable conditions for the environment (water, unplugged flask, moderate temperature).
Źródło:
Chemik; 2012, 66, 6; 585-594
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of vertical soil collectors of thermal pumps
Modelowanie gruntowych kolektorów pionowych do pomp cieplnych
Autorzy:
Sydorchuk, B.
Naumchuk, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/407690.pdf
Data publikacji:
2016
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
thermal pumps
soil collectors
thermal conductivity
pompy cieplne
kolektory gruntowe
przewodność cieplna
Opis:
The mathematic model of non-stationary process of heat distribution in soil collector is made. Convection heat transfer in the tube of collector and in depth soil temperature are taken into account. Algorithm of soil collector determination of approximating transmission function collector is created. The results and diagrams of transitional processes and dynamic description of the object are given.
Zbudowano matematyczny model niestacjonarnego procesu dystrybucji ciepła w kolektorze gruntowym. Uwzględniono konwekcyjny transfer ciepła w rurze kolektora oraz rozkład temperatury na głębokości gruntu. Stworzony został algorytm aproksymacji dla określenia funkcji transferu ciepła z gruntowego wymiennika ciepła. Pokazano wyniki i wykresy procesów przejściowych oraz opis dynamiki obiektu.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2016, 1; 29-31
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasiclassical Theory of Spin-Valve Magnetoresistance: Role of Spin-Flip Scattering
Autorzy:
Baksalary, O. M.
Barnaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/1955445.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Jn
72.15.Gd
Opis:
The Boltzmann kinetic equation is used to analyse the in-plane electronic transport in magnetic multilayers. Both diffuse and electron-momentum-conserving spin-flip scattering processes are included. Numerical results show that the momentum-conserving scattering processes reduce the spin-valve magnetoresistance.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 261-264
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DSC analysis of tvarogs depending on the fat content
Analiza DSC twarogów w zależności od zawartości tłuszczu
Autorzy:
Brożek, O. M.
Bohdziewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/270631.pdf
Data publikacji:
2018
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
skaningowa kalorymetria różnicowa
twaróg
analiza termiczna
przemiany fazowe
differential scanning calorimetry
tvarog
thermal analysis
phase transitions
Opis:
Differential Scanning Calorimetry (DSC) allows qualitative and quantitative determination of changes heats flow in a sample by physicochemical changes such as melting or oxidation as a function of time and temperature, during heating or cooling of the sample. The aim of the study was to determine the use of DSC in the evaluation of tvarogs. To the analysis were used 9 tvarogs with differed fat content (skimmed, half-fat and full-fat). The basic chemical composition of tvarogs was determined (FoodScanTMLab), and tvarogs were freeze-dried (Alpha LD plus), then their chemical composition was calculated on the grounds of dry matter concentration. A Differential Scanning Calorimeter (TA Instruments DSC Q10) with the closed cooling system (RCS) was used to determine the heat transfer rate. Two tests were conducted. The first one in ranges of temperature from -30 to 60°C and the second in ranges from -40 to 80°C. The graphical representations to illustrate the dependence of heat transfer in function of temperature of the analyzed tvarogs were obtained. The full-fat tvarogs were characterized by significant differences, as opposed to the skim and half-fat tvarogs. In the half-fat and full-fat tvarogs were occurred the peaks of phase change in the temperature range of 3.68 to 18.33°C. The most peaks was observed in full-fat tvarogs, where exothermic reactions were observed more often than in the other tvarogs. The protein content in the tvarogs was not influenced to the results of DSC analysis in the range of used temperature. Differential Scanning Calorimetry can be used to determine and compare the thermal properties of tvarogs with different fat content.
Skaningowa kalorymetria różnicowa (DSC) pozwala na jakościowe oraz ilościowe określenie zmian przepływu ciepła w badanej próbce, które zachodzą w wyniku przemian fizykochemicznych np. topnienia czy utleniania, w funkcji czasu i temperatury, podczas ogrzewania lub chłodzenia tej próbki. Badania miały na celu określenie możliwości wykorzystania DSC w ocenie twarogu. Do analiz wybrano 9 twarogów, które różniły się między sobą zawartością tłuszczu (chude, półtłuste i tłuste). Dokonano oznaczenia podstawowego składu chemicznego (FoodScanTMLab), twarogi zliofilizowano (Alpha LD plus), a następnie na podstawie koncentracji suchej masy wyliczono ich skład chemiczny. Do określenia zależności przepływu ciepła od zmieniającej się temperatury próbki użyto skaningowego kalorymetru różnicowego (TA Instruments DSC Q10) z zamkniętym układem chłodzącym (RCS). Przeprowadzono dwie próby. Pierwszą w zakresie stosowanych temperatur od -30 do 60°C, a drugą od -40 do 80°C. Otrzymano wykresy zależności przepływu ciepła od temperatury analizowanych twarogów. Twarogi tłuste charakteryzowały się znacznymi różnicami uzyskanych wyników, w przeciwieństwie do twarogów chudych i półtłustych. W twarogach półtłustych i tłustych odnotowano piki przemian fazowych, które występowały w zakresie temperatur od 3,68 do 18,33°C. Najwięcej pików zaobserwowano w twarogach tłustych, gdzie wystąpiło także więcej reakcji egzotermicznych niż w pozostałych twarogach. Zawartość białka w badanych twarogach nie wpłynęła na wyniki analizy DSC w badanym zakresie temperatur. Metodę skaningowej kalorymetrii różnicowej można wykorzystać do porównania twarogów, ze względu na różną zawartość tłuszczu.
Źródło:
Aparatura Badawcza i Dydaktyczna; 2018, 23, 2; 83-90
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of predicting the water level in the Dniester river, depending on weather conditions
Autorzy:
Mandryk, O. M.
Horbiychuk, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/122864.pdf
Data publikacji:
2014
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
synthesis of mathematical models
genetic algorithm
chromosomes
external criterion aliquant frequency harmonic series forecasting accuracy
synteza modeli matematycznych
algorytm genetyczny
chromosomy
Opis:
This paper deals with a new method of constructing mathematical models of complex processes aliquant vibration frequencies, based on the ideas of genetic algorithms. Compared with the method of data handling group, this method makes it possible to synthesize mathematical models of any complexity without selecting the number of rows selection. Moreover, the use of genetic algorithms will significantly reduce the number of calculations when iterating the models. The new point method can be used to predict both the physical phenomena and complicated processes. The authors created the model of changes in the water level in the Dniester river on the basis that the above method gives satisfactory results of forecasting.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2014, 13, 1; 45-59
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Development of Mathematical Model of Gas-Turbine Unit Combustion for Chamber Functioning
Opracowanie matematycznego modelu spalania w komorach turbin gazowych
Autorzy:
Mandryk, O. M.
Mykhayliuk, Y. D.
Powiązania:
https://bibliotekanauki.pl/articles/385498.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
komora spalania
model matematyczny
silnik turbiny gazowej
charakterystyka ekologiczna
płyn roboczy
combustion chamber
mathematical model
gas-turbine engine
ecological characteristics
actuating medium
Opis:
W artykule przedstawiono podstawowe zagadnienia zwiększenia bezpieczeństwa ekologicznego nowoczesnych stacjonarnych silników turbin gazowych (UTG). Został utworzony matematyczny model komory spalania uwzględniający główne parametry eksploatacji urządzenia. W modelu wykorzystania turbiny gazowej w różnych trybach technologicznych uwzględniono temperaturę powietrza na otworze wlotowym sprężarki osiowej, temperaturę płynu roboczego wlotowych łopatek kierowniczych turbiny i temperaturę środowiska.
This article presents the basic issues of ecological safety improvement of present-day steady-state gas-turbine units. It has been developed the mathematical model diagnostics of combustion chamber considering the basic parameters of gas-turbine unit (GTU) operation under diff erent technological modes including the intake air temperature of the axial-flow compressor, the intake temperature of the actuating medium of the directing set of the high pressure turbine as well as the temperature of the environment.
Źródło:
Geomatics and Environmental Engineering; 2016, 10, 1; 69-78
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Endangered indigenous cattle breeds of Nigeria a case for their conservation and management
Autorzy:
Gwaza, D. S.
Momoh, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1192705.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cattle-breed
Conservation
endangered
genetic-diversity
Opis:
The Nigeria cattle breeds and their productivity were reviewed. A case was made for their conservation and management, an action plan was also proposed for the Nigerian government. The indigenous cattle breeds of Nigeria have short calving interval, are hardy and trypanotolerant, known for early maturity with low mortality rate for total herd (2% and 4.7% for Muturu and Keteku respectively). The Kuri has high potentials for milk production and can calve up to twelve times in life time. They also have enormous contribution to source of income to many cattle rearers in Nigeria. The indigenous cattle breeds of Nigeria are endangered. The Muturu, N’dama and Keteku are endangered due to extensive uncontrolled crossbreeding with exotic breeds. There is also waning interest among farmers in the use of intact indigenous breeds. The Kuri and Biu cattle breeds are endangered due primarily to environment factors. The civil war also had a significant effect on the elimination of some indigenous cattle breeds especially the forest breeds. The endangered indigenous cattle breed can be conserved by the In-situ techniques. The cost of maintenance of the insitu preservation is often high, but it is to be preferred because it is less technically involving and can be well manage given adequate technologies and funds. The inbreeding effect and maintenance of natural habitat can be reduce by use of appropriate mating system and preservation of the original environment. The live conservation techniques can be organise into park with wild life for revenue generation. Rural farming communities can also be organize to form National indigenous cattle breed ownership Scheme (NICABROS), as a community based conservation management technology are action plans that are propose for insitu conservation of Nigerian endangered cattle breeds.
Źródło:
World Scientific News; 2016, 30; 68-88
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pozycja konkurencyjna ukraińskich produktów rolno-spożywczych na rynku światowym
Competitiveness of Ukrainian agricultural products in the world market
Autorzy:
Pawlowska, L.D.
Jacenko, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/572457.pdf
Data publikacji:
2006
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Opis:
Podwyższenie wymogów w konkurencji na światowym rynku rolno-spożywczym zwiększa wagę problemu oceny międzynarodowej konkurencyjności sektora rolnego Ukrainy oraz jej regionów. Aktualny problem oceny możliwości eksportu ukraińskich produktów rolniczo-spożywczych na rynki światowe jest przedstawiony poprzez obliczenia indeksów relatywnych przewag komparatywnych RCA (Relative Comparative Advantage Index) oraz RSCA, który stanowi symetryczną transformację RCA i pozwala określić perspektywiczne rynki zbytu regionalnych produktów spożywczych. Szczególną uwagę poświęcono stosunkom z Polską.
In order to evaluate the competitiveness of Ukrainian agricultural products in world agri-food markets, indices RCA (Relative Comparative Advantage Index) and RSCA were calculated for products coming from the Zhytomir province in Ukraine. The perspectives of Ukrainian accession to the EU with respect to the agricultural sector and particularly the trade relations with Poland also were investigated.
Źródło:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2006, 15
2081-6960
Pojawia się w:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship between corporate culture and effectiveness of an organization
Zależność pomiędzy kulturą korporacyjną a efektywnością organizacji
Autorzy:
Momot, V. E.
Litvinenko, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/370789.pdf
Data publikacji:
2012
Wydawca:
Wyższa Szkoła Zarządzania Ochroną Pracy w Katowicach
Tematy:
kultura korporacyjna
wskaźniki wyników przedsiębiorstwa
zaangażowanie personelu
corporate culture
performance indicators of enterprise
personnel involvement
Opis:
The study examines the effects of four major organizational culture traits, involvement, consistency, adaptability and mission on measures of company effectiveness, with the use of data collected from machine-building enterprises. The results indicate that the mission trait is the most prominent of the four traits in terms of fostering overall company performance, sales growth, market share growth and ROA.
Praca bada wpływ czterech głównych cech kultury organizacyjnej tj. zaangażowania, zgodności, adaptowalności i misji na efektywność, z wykorzystaniem danych zebranych w przedsiębiorstwach przemysłu maszynowego. Rezultaty wskazują, że to właśnie misja jest najistotniejsza w odniesieniu do ogólnych wyników firmy, wzrostu sprzedaży, wzrostu udziału w rynku oraz wskaźnika rentowności aktywów.
Źródło:
Zeszyty Naukowe Wyższej Szkoły Zarządzania Ochroną Pracy w Katowicach; 2012, 1(8); 5-20
1895-3794
2300-0376
Pojawia się w:
Zeszyty Naukowe Wyższej Szkoły Zarządzania Ochroną Pracy w Katowicach
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strontium isotope systematics in the Oppstryn drainage basin, western Norway
Autorzy:
Sæther, O. M.
Beylich, A.
Åberg, G.
Powiązania:
https://bibliotekanauki.pl/articles/294659.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
strontium isotope
systematics
Oppstryn drainage basin
western Norway
Źródło:
Landform Analysis; 2007, 5; 71
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Osoblyvosti biotekhnologii otrymannia entomopatogennogo preparatu na osnovi Bacillus thuringiensis
Features biotechnology of producing entomopatogenic product based on Bacillus thuringiensis
Autorzy:
Myhalchenko, M.
Galkin, O.Y.
Dugan, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/77182.pdf
Data publikacji:
2011
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2011, 13 B
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ewaluacja efektywności chiralnych atropoizomerycznych ligandów fosfinowych w procesach asymetrycznych katalizowanych kompleksami metali przejściowych. Część 2: Ocena efektów elektronowych
Evaluating the effectiveness of atropisomeric chiral phosphine ligands in asymmetric processes catalyzed by transition metal complexes. Part 2: An assessment of electron effects
Autorzy:
Demchuk, O.M.
Łastawiecka, E.
Pietrusiewicz, K.M.
Powiązania:
https://bibliotekanauki.pl/articles/1216852.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
chiralne fosfiny
ligandy atropoizomeryczne
ligandy fosforowe
kataliza asymetryczna
efekty elektronowe
chiral phosphines
atropisomeric ligands
phosphorus ligands
asymmetric catalysis
electron effects
Opis:
Asymetryczna synteza z wykorzystaniem chiralnych kompleksów metali przejściowych jako katalizatorów jest jedną z najbardziej ekonomicznych, przyjaznych środowisku oraz chętnie wykorzystywanych w przemyśle farmaceutycznym transformacji organicznych. Jednak z powodu braku ogólnej teorii wiążącej budowę katalizatorów katalizatorów ze stereoselektywnością syntezy, dobór odpowiedniego katalizatora dla nowej reakcji nadal odbywa się empirycznie. Ideą niniejszego przeglądu jest wyłonienie zależności pomiędzy budową katalizatora, właściwościami elektronowymi podstawników znajdujących się w ligandzie a efektywnością katalityczną jego kompleksów z metalami przejściowymi, co może znaleźć przełożenie na łatwiejszy dobór optymalnego układu katalitycznego.
The asymmetric synthesis using the chiral transition metal complexes as catalysts is one of the most cost-effective, eco-friendly and readily used organic transformations used in the pharmaceutical industry. However, because of the lack of general theory linking the structure of catalysts with the synthesis stereoselectivity, the selection of an appropriate catalyst for a new reaction is still performed on an empirical basis. The idea of this overview is to show an interdependence between the catalyst structure, the electron properties of substituents placed on the ligand and the catalytic effectiveness of its transition metal complexes, which can make it easier to choose the optimum catalytic system.
Źródło:
Chemik; 2013, 67, 4; 325-340
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An alternative extension of the k-means algorithm for clustering categorical data
Autorzy:
San, O. M.
Huynh, V. N.
Nakamori, Y.
Powiązania:
https://bibliotekanauki.pl/articles/907406.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza skupień
dane kategoryczne
eksploracja danych
cluster analysis
categorical data
data mining
Opis:
Most of the earlier work on clustering has mainly been focused on numerical data whose inherent geometric properties can be exploited to naturally define distance functions between data points. Recently, the problem of clustering categorical data has started drawing interest. However, the computational cost makes most of the previous algorithms unacceptable for clustering very large databases. The k-means algorithm is well known for its efficiency in this respect. At the same time, working only on numerical data prohibits them from being used for clustering categorical data. The main contribution of this paper is to show how to apply the notion of "cluster centers'' on a dataset of categorical objects and how to use this notion for formulating the clustering problem of categorical objects as a partitioning problem. Finally, a k-means-like algorithm for clustering categorical data is introduced. The clustering performance of the algorithm is demonstrated with two well-known data sets, namely, soybean disease and nursery databases.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 2; 241-247
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Marketing strategies as a part of crisis management of enterprises
Autorzy:
Balanovska, T.I.
Gavrysh, O.M.
Kraciuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/29432293.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2015, 15[30], 4; 5-16
2081-6960
Pojawia się w:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study of the antioxidant activity and phytochemical composition of leaves extract between three varieties of date palm tree
Autorzy:
Eddine, L. S.
Ladjel, S.
Mohamed, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/412430.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Phoenyx dactylifera
polyphenol
DPPH radical-scavenging activity
reducing power
antimicrobial
south Algeria
Opis:
The date palm (Phoenyx dactylifera) consisted, for the people of southern Algeria, as tree of providence. Dates and their extracts are also used for many centuries as a medicine against allergy, inflammation, constipation and gastro-protective; they also have a high antibacterial and antioxidant activity. However, no studies are conducted to evaluate the extract from the leaves of date palm (Phoenyx dactylifera) in point of view of phytochemical composition, antimicrobial and the antioxidant activity. In this study, we have determined the phenolic compounds, antioxidant and antimicrobial activity of methanolic extracts from three varieties of leaves tree. According to the results the leaves extracts have very important values for polyphenols (215.24 to 156.46 mg GAE / g DW) and high antioxidant activity (324. 45 to 206.21 mg GAE / g DW), Diphenyl-1 picrylhydrazyl radical-scavenging activity (IC50 = 2.98 to 4.83 μg / ml); also the three extracts reveal a considerable antimicrobial potency and antifungal considerable activity, the diameter of inhibition is 35.2 to 39.5 mm (concentration 50 mg/ml) for Candida albicans ATCC 90026.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 9, 2; 162-171
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Further Study on Thermal Performance of Porous Fin with Temperature-Dependent Thermal Conductivity and Internal Heat Generation using Galerkin’s method of Weighted Residual
Autorzy:
Sobamowo, M. G.
Kamiyo, O. M.
Adeleye, O. A.
Powiązania:
https://bibliotekanauki.pl/articles/1046542.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Galerkin’s method of weighted residual
Porous Fin
Surface convective heat transfer
Temperature-Dependent Thermal Conductivity and Internal Heat Generation
Thermal performance
Opis:
This work is presented as a further study to our previous work, “Thermal performance analysis of a natural convection porous fin with temperature-dependent thermal conductivity and internal heat" published in "Thermal Science and Engineering Progress. 1 (2017) 39–52”, where it was assumed that the surface convection is negligible and heat is transferred only by natural convection in the porous fin. In this present study, such an assumption has been relaxed. Also, effects of surface convective heat transfer on the thermal performance of porous fin with temperature-dependent thermal conductivity and internal heat generation have been investigated using Galerkin’s method of weighted residual. The results of the Galerkin’s method of weighted residual show excellent agreement with the results of numerical method using shooting method coupled with Runge-Kutta method and also with the results of homotopy perturbation method. Thereafter, the developed analytical solutions are used to investigate the influences of the thermal model parameters on the thermal performance of the porous fin. It is found as the with the other model parameters that as the convective parameter increases, the rate of heat transfer from the base of the fin increases and consequently, the porous fin efficiency improves. However, increase in the nonlinear thermal conductivity parameter decreases the temperature distribution in the fin. Based on the high accuracy of the Galerkin’s method of weighted residual as displayed in this work, it is hoped that the simple analytical solutions given by the approximate analytical method will enhance the analysis of extended surfaces and also assist the designers.
Źródło:
World Scientific News; 2019, 138, 2; 167-191
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inelastic stability analysis of uniaxially compressed flat rectangular isotropic CCSS plate
Autorzy:
Ibearugbulem, O. M.
Eziefula, U. G.
Onwuka, D. O.
Powiązania:
https://bibliotekanauki.pl/articles/265658.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
deflection function
plastic buckling
rectangular plate
Taylor's series
work principle
płyta izotropowa
wyboczenia
metoda Taylora
Opis:
This study investigates the inelastic stability of a thin flat rectangular isotropic plate subjected to uniform uniaxial compressive loads using Taylor-Maclaurin series formulated deflection function. The plate has clamped and simply supported edges in both characteristic directions (CCSS boundary conditions). The governing equation is derived using a deformation plasticity theory and a work principle. Values of the plate buckling coefficient are calculated for aspect ratios from 0.1 to 2.0 at intervals of 0.1. The results compared favourably with the elastic stability values and the percentage differences ranged from -0.353% to -7.427%. Therefore, the theoretical approach proposed in this study is recommended for the inelastic stability analysis of thin flat rectangular isotropic plates under uniform in-plane compression.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 3; 637-645
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the Ecological-Economic Degree of Development in Countries of SE Europe – Weight Coefficients Technique
Oszacowanie ekologiczno-ekonomicznego poziomu rozwoju w krajach południowo-wschodniej Europy
Autorzy:
Golušin, M.
Ivanović, O. M.
Jovanović, L.
Domazet, S.
Powiązania:
https://bibliotekanauki.pl/articles/371440.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
Tematy:
wskaźniki ekologiczne
wskaźniki ekonomiczne
współczynniki ważności
Europa Południowo-Wschodnia
ecological indicators
economic indicators
weight coefficients
SE Europe
Opis:
The practice has indicated that there is a particularly sensitive relationship that exists between ecological and economic subsystem of sustainable development. Therefore this research suggests to compare the states of these two subsystems as a new conceptual frame which is essential for strategic conceptualization of development of countries, by the use of weight (importance) coefficients method. The research pointed out at a rather visible gap between the achieved degree of economic and ecological development in the countries of South Eastern Europe in respect to Germany and France – which were taken into consideration as two of the most developed countries in the European Union and in the entire world. The usage of statistic method of weight (importance) coefficients requires assigning a certain degree (of individual value) to each and every indicator. In order to have a better overview and to get more precise results the weight coefficients in range from 0 to 100 were used. The results obtained by using the scale with lower values showed less qualitative final outcome. Used statistical technique for indicated research has shown excellent results and requires additional improvements
Praktyka wskazuje na istnienie szczególnego powiązania pomiędzy ekologicznym i ekonomicznym subsytemem rozwoju zrównoważonego. Dlatego w prezentowanych badaniach dokonaliśmy porównania stanów tych dwóch subsystemów używając metody współczynników ważności – to nowa perspektywa niezbędna dla strategicznej konceptualizacji rozwoju poszczególnych krajów. Badania wskazały na istnienie poważnych rozbieżności pomiędzy osiągniętym poziomem ekonomicznego i ekologicznego rozwoju krajów Europy Południowo-Wschodniej a najbardziej rozwiniętymi krajami, tak w Unii Europejskiej, jak i z perspektywy ogólnoświatowej, którymi są Niemcy i Francja. Użycie metod statystycznych wymaga przypisania określonego stopnia (wartości indywidualnej) dla każdego wskaźnika. Aby uzyskać bardziej trafne wyniki użyto współczynników ważności z zakresu 1 – 100.
Źródło:
Problemy Ekorozwoju; 2012, 7, 1; 87-93
1895-6912
Pojawia się w:
Problemy Ekorozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Research of Tandem-Scheme UAV Model Aerodynamic Characteristics
Autorzy:
Masko, O. M.
Kryvokhatko, I. S.
Sukhov, V. V.
Powiązania:
https://bibliotekanauki.pl/articles/213671.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
UAV
tandem-scheme
aerodynamic characteristics
wingspan
stagger
dihedral angles
Opis:
Tandem-wing aerodynamic scheme became widespread for tube launch UAV due to possibility of required flight performance realization under tight dimension constraints. In this work results of wind tunnel weight and visual tests of UAV model with wingspans about 1 m are presented. Model aerodynamic characteristics were defined by six-component wind tunnel balance at Mach number 0.075 and Reynolds number 187 000 calculated for one wing chord of 0.11 m. Model stagger (390, 490, 590 mm), rear wing dihedral angle (0°, -5°, -9°), forward-to-rear wingspan ratio (0.67; 0.9; 0.92; 1.24) were variable. It was determined that model is longitudinal and directional static stable, has high maximal lift-drag ratio (in range from 10.6 to 13.7) and acceptable maximal lift coefficient without flaps (from 1.05 to 1.09) and critical angle of attack (from 15.1 to 16.4°). Stagger increasing leads to zero or positive maximal lift-drag ratio increasing. If forward wing span is larger than rear wing span than stagger increasing is more effective with zero dihedral angle. If rear wing span is larger than forward wing span than stagger increasing is more effective with negative dihedral angle.
Źródło:
Prace Instytutu Lotnictwa; 2014, 4 (237) December 2014; 63-75
0509-6669
2300-5408
Pojawia się w:
Prace Instytutu Lotnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An assessment of the influence of the main oil industry technological processes on the environment
Autorzy:
Mandryk, O. M.
Pukish, A. V.
Mykhailiuk, Y. D.
Powiązania:
https://bibliotekanauki.pl/articles/298951.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
oil production
ecological factors of influence on the environment
oil production technological process
Opis:
This article discusses the main dangerous ecological factors of influence of each individual technological process element of oil production on the environment, namely: preparation of the ground for well construction, oil production, transportation of well production, its storage in reservoirs, and storage of the oil industry wastes. There was developed a primary classification of the characteristic infuences of the main oil industry technological processes onto the environment.
Źródło:
AGH Drilling, Oil, Gas; 2015, 32, 4; 723-729
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Weathering rates, natural organic matter and global climate change : are they related ?
Autorzy:
Macalady, D. L.
Ranville, J. F.
Sæther, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/294396.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
weathering rates
natural organic matter
global climate change
Źródło:
Landform Analysis; 2007, 5; 49-50
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Additive Genetic Effect of Dam-sire, Dam, Common Maternal and Environmental Effect on Clutch Traits of Two Nigerian Local Chickens Populations
Autorzy:
Gwaza, D. S.
Dim, N. I.
Momoh, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1186738.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Tiv ecotypes
additive-effect
clutch-traits
dam-sire
Opis:
The study was conducted at Akpehe poultry farm, Makurdi. The objectives of the study were to assess the additive genetic effects of dam-sire, dam and maternal effects on clutch traits with the aim to apply these to selection and breeding in order to improve these traits.120 birds were used for the study, 60 each for the Fulani and the Tiv ecotypes. The birds were housed singly in identified cages and hand mated in the pen. Data were collected on clutch size, clutch number, pause length and number, month, sire, dam and ecotype. Ecotype significantly affected clutch size and clutch number. Pause length and number were not affected by ecotype. The additive genetic effect of the sire and dam significantly affected clutch size and clutch number. Heritability estimates due to sire on pulse length and pulse number were very low, while the heritability estimates for clutch number and clutch size were moderate. Non additive genetic effect of the dam ,other maternal environment as well as month significantly affected clutch number, pause length and number. Selecting superior birds based on clutch size and number due moderate heritability estimates will lead to genetic improvement in egg number especially when dam conditions and management employed are improved.
Źródło:
World Scientific News; 2016, 32; 1-12
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intrinsic Luminescence of the Undoped Glasses of (CaO-Ga$\text{}_{2}$O$\text{}_{3}$-GeO$\text{}_{2}$) System
Autorzy:
Padlyak, B. V.
Bordun, O. M.
Buchynskii, P. P.
Powiązania:
https://bibliotekanauki.pl/articles/2010938.pdf
Data publikacji:
1999-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Ce
78.60.-b
76.30.Mi
Opis:
For the first time the intrinsic luminescence in the undoped (CaO-Ga$\text{}_{2}$O$\text{}_{3}$-GeO$\text{}_{2}$) glasses with different composition has been found and investigated in the 80÷300 K temperature range. The new glasses of high chemical purity and optical quality with stoichiometric composition similar to that in calcium-gallium- germanium garnet (Ca$\text{}_{3}$Ga$\text{}_{2}$Ge$\text{}_{3}$O$\text{}_{12}$), trigonal Ca-gallogermanate (Ca$\text{}_{3}$Ga$\text{}_{2}$Ge$\text{}_{4}$O$\text{}_{14}$), and Ca$\text{}_{3}$Ga$\text{}_{2}$O$\text{}_{6}$ crystals were obtained by the high-temperature synthesis method. The luminescence and photoexcitation spectra analysis, supported by EPR spectroscopy data, yields the following results: (i) the UV-excited non-elementary broad emission band with maxima at roughly 500 nm and 420 nm in the (CaO-Ga$\text{}_{2}$O$\text{}_{3}$-GeO$\text{}_{2}$) glasses is due to recombination of ensemble of the transient hole O$\text{}^{-}$ centres; (ii) the emission bands with maxima at nearly 380 and 710 nm, which were distinctly revealed in glasses with the Ca$\text{}_{3}$Ga$\text{}_{2}$Ge$\text{}_{4}$O$\text{}_{14}$ and Ca$\text{}_{3}$Ga$\text{}_{2}$O$\text{}_{6}$ compositions, are assigned to the luminescence of UV-induced electron centres of two different types. Possible models of the luminescence centres in (CaO-Ga$\text{}_{2}$O$\text{}_{3}$-GeO$\text{}_{2}$) glass network are discussed.
Źródło:
Acta Physica Polonica A; 1999, 95, 6; 921-929
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metal Surface Dipole Moment and Work Function in the Linear Potential Model
Autorzy:
Mohammed, A. E.
Ghaly, A. Y.
Frege, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1891682.pdf
Data publikacji:
1991-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.30.+y
Opis:
Jellium metal surface properties such as the surface dipole barrier and work function are obtained in the linear potential approximation to the effective potential at the surface. The metal surface position and field strength are determined respectively by the requirement of overall charge neutrality and the constraint set on the electrostatic potential by the Budd-Vannimenus theorem. The calculations are primarily analytic and these properties are given in terms of universal functions of the field strength. The results obtained employing the Ceperly-Alder expression for the correlation energy closely approximate those of Lang and Kohn.
Źródło:
Acta Physica Polonica A; 1991, 80, 4; 591-600
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrically Detected Magnetic Resonance
Autorzy:
Fedorych, O. M.
Wilamowski, Z.
Jantsch, W.
Sadowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2038127.pdf
Data publikacji:
2004-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Pk
72.25.Rb
73.21.Fg
Opis:
We compare the results of electrically detected magnetic resonance in a 2D electron gas in Si/SiGe quantum wells with transport and magnetic resonance measurements on ferromagnetic Ga$\text{}_{1-x}$Mn$\text{}_{x}$As. The results lead us to the conclusion that observation of electrically detected magnetic resonance is possible only in the case of a slow spin relaxation, where the microwave resonant absorption leads to a noticeable change of spin magnetization.
Źródło:
Acta Physica Polonica A; 2004, 105, 6; 591-598
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A disaggregated measures approach of poverty status of farming households in Kwara State, Nigeria
Zdezagregowane pomiary ubóstwa wśród gospodarstw rolnych w stanie Kwara w Nigerii
Autorzy:
Akinsola, G.O.
Adewumi, O.M.
Ayinde, O.E.
Powiązania:
https://bibliotekanauki.pl/articles/43550.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
Tematy:
poverty
measurement
agriculture
household
poverty status
Kwara State
Nigeria
Opis:
In a bid to strengthen the agricultural sector in Nigeria, the Kwara State Government invited thirteen Zimbabwean farmers to participate in agricultural production in Kwara State in 2004. The main objective of this study therefore was to examine the effect of the activities of these foreign farmers on local farmers’ poverty status. A questionnaire was administered on the heads of farming households. A total of 240 respondents were used for the study, which was comprised of 120 contact and 120 non-contact heads of farming households. The analytical tools employed included descriptive statistics and the Foster, Greer and Thorbecke method. The result indicated that the non-contact farming households are poorer than the contact farming households. Using the disaggregated poverty profile, poverty is most severe among the age group of above 60 years. The intensity of poverty is also higher among the married group than the singles. Based on the education level, poverty seems to be most severe among those without any formal education. It is therefore recommended that a minimum of secondary school education should be encouraged among the farming households to prevent higher incidence of poverty in the study area.
W ramach starań o wzmocnienie sektora rolniczego w Nigerii w 2004 roku władze stanu Kwara zaprosiły trzynastu zimbabweńskich rolników do udziału w stanowej produkcji rolnej. Głównym celem badania była analiza wpływu działalności zagranicznych rolników na poziom ubóstwa wśród rolników lokalnych. Kwestionariusz skierowano do osób zarządzających gospodarstwami rolnymi. W badaniu udział wzięło 240 respondentów, w tym 120 mających styczność z działalnością zagranicznych rolników i 120 takich, którzy nie mają z nią styczności. Wykorzystano następujące narzędzia analityczne: statystykę opisową oraz metodę Fostera-Greera-Thorbecka. Zgodnie z uzyskanymi wynikami gospodarstwa rolne pozostające poza enklawą zagranicznych rolników były biedniejsze niż te w jej zasięgu. Według zdezagregowanego pomiaru ubóstwa bieda mocno dotyka osoby z grupy wiekowej powyżej 60 lat. Intensywność ubóstwa jest wyższa także u osób w związku małżeńskim niż stanu wolnego. Ubóstwo wydaje się również bardziej dotkliwe wśród osób nieposiadających oficjalnego wykształcenia. Zaleca się zatem wsparcie uzyskiwania minimalnego wykształcenia średniego przez pracowników gospodarstw rolnych, by zapobiec poszerzaniu zasięgu ubóstwa na badanym obszarze.
Źródło:
Journal of Agribusiness and Rural Development; 2016, 42, 4
1899-5241
Pojawia się w:
Journal of Agribusiness and Rural Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical approach into dynamic behavior of functionally graded circular plates resting on two-parameter foundations under excitation force
Autorzy:
Salawu, S. A.
Sobamowo, M. G.
Sadiq, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1030674.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Laplace-Padè
Nonlinear dynamic analysis
functional graded plate
two-dimensional differential transform
two-parameter foundations
Opis:
The study of dynamic behavior of functional graded circular plates has gained significant attention in engineering in recent time due to the vast application of the material in engineering and manufacturing industry. This study focus on the application of two-dimensional differential transform method to investigate the dynamic response of functional graded circular plates resting on two-parameter elastic foundations. However, the maximum deflection is obtained using dimensionless scheme, Laplace-Padè approximant is used to treat the small domain issue of the analytical solutions. Also, the solutions obtained are used for parametric investigation. From the results, it is found out that increase in Winkler, Pasternak and combine foundation parameters results to decrease in maximum deflection, increase in material properties of the functional graded plates leads to decrease in maximum deflection, clamped boundary condition has the lower deflection. Increasing the excitation frequency results in lower deflection. Results obtained maybe used as benchmark for validation of method using other approaches.
Źródło:
World Scientific News; 2020, 139, 2; 115-134
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cultivation of Oleaginous Microalgae Scenedesmus obliquus on Secondary Treated Municipal Wastewater as Growth Medium for Biodiesel Production
Autorzy:
Eida, M. F.
Darwesh, O. M.
Matter, I. A.
Powiązania:
https://bibliotekanauki.pl/articles/123215.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
biodiesel
microalgae
Scenedesmus
municipal wastewater biomass
oil contents
fatty acid composition
Opis:
Local single cell microalgae isolated from a wastewater swamp and identified as Scenedesmus obliquus was used to determine its applicability for utilization of domestic wastewater for biomass and lipid production. Secondary treated domestic wastewater with or without mixing of growth medium was used to cultivate S. obliquus for the biomass and lipid production as a renewable feedstock for biodiesel. S. obliquus showed the highest OD when grown in 100% Bold’s basal medium (BBM). S. obliquus utilized 95.2% and 78.5% of P and N contents, respectively, when grown in 25% WW+75% BBM mixture and the utilization efficiency of both elements decreased with the increasing wastewater portion in the mixture. Although the BBM displayed the highest dry biomass and lipid production (25.15% of the cell dry biomass). The lowest values were recorded for the uninoculated wastewater, followed by 100% wastewater enriched with S. obliquus. The obtained data revealed that the lipid classes of S. obliquus differs according to the cultivation medium and conditions. The highest percentage of C16-C18 fatty acids (54.76% from total lipids) were recorded in case of algae cultivated in 100% wastewater, followed by 46.96% in case of 100% BBM medium. These results suggest the utilization of mixtures containing a higher portion of secondary treated wastewater, such as 75% WW+25% BBM or 50% WW+50% BBM, could increase the economical production of the lipid-rich microalgae S. obliquus for biodiesel through saving water and nutrients.
Źródło:
Journal of Ecological Engineering; 2018, 19, 5; 38-51
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sound ray stability in the tram strait
Autorzy:
Hobæk, H.
Johannessen, O. M.
Sagen, H.
Hamre, T.
Powiązania:
https://bibliotekanauki.pl/articles/331760.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
In the research program "Acoustic Monitoring of the Ocean Climate in the Arctic" (AMOC), the objective is to assess the possibility of using acoustic methods to monitor any long term changes in temperature and ice thickness in the Arctic. The main influx/efflux of water (and heat) to the Arctic Ocean is through the Fram-Strait. Thus, monitoring the temperature distribution and water flux in the Fram-Strait is an important issue in this respect. In this presentation we focus on certain aspects of acoustic thermometry using ray tracing. In order to apply acoustic means for monitoring temperature and flux of water masses it is essential that it is possible to identify arrival of individual rays at the receiver location, while the environment undergoes seasonal and shorter time scale variations. The present study is based on ray simulations using environmental data for the period 1950-1990 in terms of decadal means. In addition a detailed map of one passing meso scale eddy was used. The main conclusion is that some rays may be identified most of the time, even during passing eddies.
Źródło:
Hydroacoustics; 2001, 4; 91-94
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Incidence of Phytophthora infestans (Mont.) de Bary on potato and tomato in Maine, 2006–2010
Autorzy:
Olanya, O.M.
Larkin, R.P.
Honeycutt, C.W.
Powiązania:
https://bibliotekanauki.pl/articles/66822.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Late blight, caused by Phytophthora infestans (Mont.) de Bary, is a devastating disease which is found worldwide. In Maine, United States (US), we recorded late blight on potato and tomato during the 2006–2009 cropping seasons. From 2006 to 2008, over 90% of the diseased samples were collected in potato fields from northern and central Aroostook County in Northern Maine, US. Then, in 2009, an unprecedented influx of inoculum on infected tomato transplants shipped to retail garden centers throughout the Northeast US significantly changed the late blight infection patterns. In 2009, 43% of diseased samples obtained were from tomato, and 57% from potato, and disease was found to occur all over the state. Moran’s index and spatial autocorrelation analysis of disease occurrence, geographical locations, host factors, and infection levels from previous years, were not statistically significant (p > 0.05). Therefore, random distributions of late blight incidences were recorded across locations and years. Nearest neighbor analysis revealed that mean spatial distances for late blight occurrence ranged from 1.51 to 71.4 km from 2006 to 2008, and 7.4 to 126.5 km in 2009. The frequency and locations of late blight outbreaks in 2009 were substantially greater than in 2006, 2007, and 2008, as affected by the influx of inoculum and movement of infected tomato seedlings as well as conducive environmental conditions. All were contributing factors for late blight occurrence in Maine. In 2010, few disease samples were collected, indicating that the influx of inoculum in 2009 did not persist to cause widespread disease in 2010. The reduction of inocula sources, fungicide protection of susceptible hosts, and the removal and destruction of infected tomato seedlings and potato cull piles or volunteer plants, can greatly reduce late blight occurrences and improve potato production. These actions should be considered as an integral part of late blight management programmes in regions where late blight commonly occurs.
Źródło:
Journal of Plant Protection Research; 2015, 55, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastic buckling analysis of uniaxially compressed CCCC stiffened isotropic plates
Autorzy:
Ibeabuchi, V. T.
Ibearugbulem, O. M.
Ezeah, C.
Ugwu, O. O.
Powiązania:
https://bibliotekanauki.pl/articles/1839782.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wyboczenie
blacha
metoda pracy
buckling
governing equation
polynomial function
uniaxially stiffened plate
work principle method
Opis:
This paper reports a research study that investigated buckling of stiffened rectangular isotropic plates elastically restrained along all the edges (CCCC) under uniaxial in-plane load, using the work principle approach. The stiffeners were assumed to be rigidly connected to the plate. Analyses for critical buckling of stiffened plates were carried out by varying parameters, such as the number of stiffeners, stiffness properties and aspect ratios. The study involved a theoretical derivation of a peculiar shape function by applying the boundary conditions of the plate on Taylor Maclaurin’s displacement function and substituted on buckling equation derived to obtain buckling solutions. The present solutions were validated using a trigonometric function in the energy method from previous works. Coefficients, K, were compared for various numbers of stiffeners and the maximum percentage difference obtained within the range of aspect ratios of 1.0 to 2.0 is shown in Figs 2 - 7. A number of numerical examples were presented to demonstrate the accuracy and convergence of the current solutions.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 84-95
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First report of Pythium aphanidermatum infecting tomato in Egypt and its control using biogenic silver nanoparticles
Autorzy:
Elshahawy, I.
Abouelnasr, H.M.
Lashin, S.M.
Darwesh, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/66024.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Pythium aphanidermatum
plant disease
tomato
Lycopersicon esculentum
Egypt
pest control
biogenic substance
silver nanoparticle
Opis:
In August 2016, tomato plants grown during a hot, wet summer with heavy soil flooding, displaying symptoms of wilting, dead plant, root rot with crown and stem rot, at Beni Suef and Fayoum governorates were examined. A number of 16 fungal isolates were isolated from tomato plants displaying the above symptoms. These isolates were classified as belonging to six species, namely: Alternaria solani, Chaetomium globosum, Fusarium solani, Fusarium oxysporum, Pythium spp. and Rhizoctonia solani. Isolates of Pythium spp. were prevalent and were found to be more pathogenic than the other fungal isolates. This species causes damping-off, root rot, sudden death, stem rot and fruit rot. The pathogen was identified as Pythium aphanidermatum based on morphological, cultural, and molecular characteristics. Biogenic silver nanoparticles (AgNPs) were produced using the F. oxysporum strain and characterized by transmission electron microscopy (TEM). The size of these spherical particles ranged from 10 to 30 nm. In vitro, biogenic AgNPs showed antifungal activity against P. aphanidermatum. In greenhouse and field experiments, AgNPs treatment significantly reduced the incidence of dead tomato plants due to root rot caused by P. aphanidermatum compared to the control. All of the investigated treatments were effective and the treatment of root dipping plus soil drenching was the most effective. To the best of our knowledge, this study describes P. aphanidermatum on tomato in Egypt for the first time. Also, biogenic AgNPs could be used for controlling root rot disease caused by this pathogen.
Źródło:
Journal of Plant Protection Research; 2018, 58, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Resonance Studies of the Origin of Ferromagnetism in Ga$\text{}_{1-x}$Mn$\text{}_{x}$As
Autorzy:
Fedorych, O. M.
Wilamowski, Z.
Potemski, M.
Byszewski, M.
Sadowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2036029.pdf
Data publikacji:
2003-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
76.30.Fc
75.50.Pp
75.30.Gw
Opis:
Different types of magnetic resonance observed in Ga$\text{}_{1-x}$Mn$\text{}_{x}$As reflect three different magnetic phases: para-, ferro-, and ferrimagnetic. Ferromagnet is characterized by single isotropic resonance line. A complex spectrum in ferrimagnet can be described by g factor equal to 1.44 and a sum of an axial and cubic anisotropy field. The axial field is by an order of magnitude greater than the cubic one. The complex structure of ferrimagnetic resonance is attributed to spin-wave resonance. Quantitative analysis of the dispersion of spin wave shows that the range of exchange coupling is very long, of the order of 25 nm, while spin-wave stiffness and the total exchange field are very small. The exchange field as evaluated from spin wave is by two orders of magnitude smaller than the Zener field corresponding to the critical temperature.
Źródło:
Acta Physica Polonica A; 2003, 103, 6; 607-612
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of the eddy current method features in the implementation of computer simulation algorithms for controlling the characteristics of the food production equipment parts
Autorzy:
Zashchepkina, N. M.
Zdorenko, V. G.
Sebko, V.
Markina, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/367785.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
computer simulation
food production modernization
quantitative indicator
coefficients influence
errors of aggregate measurements
symulacja komputerowa
produkcja żywności
modernizacja produkcji
wskaźnik ilościowy
błędy pomiarowe
Opis:
Purpose: The purpose of this article is to study the theoretical provisions of the operation of a vortex device in the implementation of a non-contact method of controlling the details of brewing equipment using computer simulation algorithms. Design/methodology/approach: The theoretical positions of thermal ECT operation with a copper product are obtained, which is controlled while maintaining a constant value of the magnetic field frequency f1 = 70.0 Hz, with small values of the generalized parameter x≤1.1 and increasing the parameter x due to the increase in the frequency of thermal ECT, that is, at x≥3.5. Findings: On the basis of computer simulation algorithms the results of the joint measuring control of diameter d, electrical resistance ρ and temperature t of the sample made of copper (in the temperature range from 20-160°C) and the results of determination of thermally dependent thermal ECT signals with the sample of equipment details and the values of specific normalized values that relate the ECT signals to the physical and mechanical characteristics of the samples of the equipment being monitored. Research limitations/implications: Product diameters range is 5 mm to 50 mm. The lower boundary is limited by the frequency of the magnetic field f = 20 Hz and the upper boundary by the diameter of the frame of the thermal eddy current transformer transducer is 50 mm. Perspective positions of work require further development in the direction of extending the limits of control of geometrical parameters of the samples due to the use of automated control systems based on overhead eddy current transformer transducers. Practical implications: The practical value of the work is to increase the overall likelihood of control of the parameters of brewing equipment parts by increasing its instrumental component Di, due to the reduction of measurement errors due to instrumental techniques and on the basis of computer modelling algorithms for three-parameter control of parts of brewing equipment, electrical and temperature parameters, allows to obtain the value of the overall control probability Dz = 0.998. Originality/value: The originality of the article is the study of the theoretical provisions of the eddy current transformer transducer and the implementation of a non-contact method of controlling the details of brewing equipment using computer simulation algorithms that take into account the modes of joint three-parameter control: at high values of the generalized parameter x (with three-parameter surface control), at small values of x (while controlling the value of the average cross section geometry, electrical, temperature settings) at a fixed frequency magnetic field (get information on the diameter d, resistivity ρ and temperature t with a certain depth of penetration of the magnetic field in the sample Δ).
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2019, 97, 1; 31-40
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the month of lactation on the yield, proximate chemical composition and mineral content of milk from primiparous and multiparous cows
Autorzy:
Pogorzelska, J.
Micinski, B.
Zieba, M.
Magzievish, O.M.
Micinski, J.
Powiązania:
https://bibliotekanauki.pl/articles/15911.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Źródło:
Journal of Elementology; 2018, 23, 4
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnosing corporate stability using grammatical evolution
Autorzy:
Brabazon, A.
O'Neill, M.
Powiązania:
https://bibliotekanauki.pl/articles/907637.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ewolucja gramatyczna
prognozowanie awarii
mapowanie procesu
grammatical evolution
corporate failure prediction
mapping process
Opis:
Grammatical Evolution (GE) is a novel data-driven, model-induction tool, inspired by the biological gene-to-protein mapping process. This study provides an introduction to GE, and demonstrates the methodology by applying it to construct a series of models for the prediction of bankruptcy, employing information drawn from financial statements. Unlike prior studies in this domain, the raw financial information is not preprocessed into pre-determined financial ratios. Instead, the ratios to be incorporated into the classification rule are evolved from the raw financial data. This allows the creation and subsequent evolution of alternative ratio-based representations of the financial data. A sample of 178 publicly quoted, US firms, drawn from the period 1991 to 2000 are used to train and test the model. The best evolved model correctly classified 86 (77)% of the firms in the in-sample training set (out-of-sample validation set), one year prior to failure.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 3; 363-374
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of arbuscular mycorrhizal fungal inoculations on the growth and polyphenol levels of garden leek (Allium porrum)
Autorzy:
Nasir, M.S.A.
Nunez, A.
McKeever, L.C.
Olanya, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/66601.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plant height
polyphenol content
root colonization
shoot weight
root weight
fungi
fungal spore
Rhizophagus intraradices
Gigaspora margarita
Glomus geosporum
Paraglomus occultum
Claroideoglomus claroideum
arbuscular mycorrhizal fungi
inoculation
garden leek
Allium porrum
Opis:
Arbuscular mycorrizal (AM) fungi may enhance plant growth and polyphenol production, however, there have been limited studies on the relationships between root colonization of different fungal species and polyphenol production on cultivated Allium porrum (garden leek). The effects of inoculation of AM fungi spores from Rhizophagus intraradices, Giga -spora margarita, Glomus geosporum, Paraglomus occultum, Claroideoglomus claroideum, and Glomus species on colonization of garden leek roots and symbiotic changes in polyphenol production and plant growth were evaluated in greenhouse experiments. There were significant differences (p < 0.05) in colonization of leek roots by AM fungi species. The greatest level of root colonization was recorded on plants inoculated with R. intraradices (73%) and the lowest level on C. claroideum (3.2%). Significant differences (p < 0.05) in plant height were recorded between AM inoculated plants and the controls. Polyphenol levels differed significantly (p < 0.05) between garden leek plants inoculated with AM fungi and the non-inoculated controls. The percentage increases in polyphenol (a derivative of kaempferol) on garden leeks inoculated with G. geosporum relative to the untreated controls ranged from 28 to 1123%. Due to symbiosis with different AM species, other polyphenols decreased in some instances (negative values) and increased in others for values of up to 590%. Results showed that AM fungi species exhibited remarkable differences in polyphenol levels in garden leeks. The high polyphenol production by garden leek plants inoculated with G. geosporum, and Glomus species could be exploited for enhanced resistance of garden leeks to insects and diseases. This research highlights an understudied area, notably the relationships between AM fungal inoculations, root colonizations and polyphenol production in garden leeks. The findings can be utilized to improve pest resistance and the quality of garden leek plants.
Źródło:
Journal of Plant Protection Research; 2018, 58, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE TRENDS OF DEVELOPMENT OF PHOSPHATE REGIME IN WESTERN BUG SURFACE WATERS ON THE TERRITORY OF UKRAINE
TENDENCJE ROZWOJU EUTRIFIZACJI FOSFORANOWEJ W WODACH POWIERZCHNIOWYCH ZACHODNIEGO BUGU NA TERENIE UKRAINY
ТЕНДЕНЦИИ ФОРМИРОВАНИЯ ФОСФАТНОГО РЕЖИМА ПОВЕРХНОСТНЫХ ВОД Р. ЗАПАДНЫЙ БУГ НА ТЕРРИТОРИИ УКРАИНЫ
Autorzy:
Voznyuk, N.N
Likho, E.A
Prischepa, A.N
Kopylova, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/576649.pdf
Data publikacji:
2017
Wydawca:
Międzynarodowy Instytut Innowacji Nauka – Edukacja – Rozwój w Warszawie
Tematy:
biogenic elements, рhosphate, eutrophication, water quality, control point
odżywki, fosforany, eutrofizacja, jakość wód, punkty monitoringu
биогенные вещества, фосфаты, эфтрофикация, качество воды, пункты наблюдения
Opis:
W artykule opisano tendencje rozwoju eutrofizacji fosforanowej w wodach powierzchniowych Zachodniego Bugu na terenie Ukrainy. Autorzy wyjaśnili, że jednym z podstawowych zagadnień dotyczących wód powierzchniowych rzeki Zachodni Bug jest proces eutrofizacji, który jest spowodowany napływem nadmiernej ilości substancji biogenicznych, tj. składników odżywczych w tym fosforanów dla glonów i innych organizmów żyjących w rzece Bug. W celu zbadania dynamiki zmian zawartości fosforanów w dorzeczu Zachodniego Bugu, przeprowadzono analizę koncentracji fosforanów wzdłuż koryta rzeki, zidentyfikowano zmienność sezonową zawartości fosforanów w reprezentatywnych punktach obserwacyjnych, główne źródła napływu fosforanów i zidentyfikowano najbardziej zanieczyszczone sekcje rzeki Bug. Na koniec zwrócono uwagę na konieczność przywrócenia i ochrony właściwego stanu ekologicznego rzek transgranicznych.
The article stipulates that one of the primary issues regarding surface waters of Western Bug river, specifically eutrophication, is caused by influx of excessive amount of biogens (which include phosphates).In order to study the dynamics of change of phosphate regime in Western Bug river basin, analysis of phosphate concentrations change alongside river bed has been performed, season-related features of phosphate contents in representative observation points have been determined, main phosphates influx sources and most polluted sections of the river have been identified.Finally, the attention has been focused on the necessity to restore and guard the "good" ecological state of transboundary rivers.
В статье, указано, что причиной одной из основных проблем поверхностных вод р. Западный Буг – эфтрофикации, является поступление избыточного количества биогенов (среди них фосфатов).С целью исследования динамики изменений фосфатного режима в бассейне реки Западный Буг проанализировано изменения концентраций фосфатов по руслу реки, сезонные особенности их содержания в репрезентативных пунктах наблюдения, установлены основные источники его поступления и наиболее загрязнённые участки реки.Как итог, акцентировано внимание на необходимости восстановления и охраны "хорошего" экологического состояния трансграничных рек.
Źródło:
International Journal of New Economics and Social Sciences; 2017, 5(1); 158-167
2450-2146
2451-1064
Pojawia się w:
International Journal of New Economics and Social Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single-pulse method for measuring the current-voltage characteristics of solar panels
Autorzy:
Bozhko, K. M.
Zashchepkina, N. M.
Markin, M. O.
Markina, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/378907.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
solar batteries
voltage-current characteristic
bateria słoneczna
charakterystyka napięciowo-prądowa
Opis:
Purpose: The purpose of the paper is to substantiate the new method of measuring the voltage-current characteristics of solar batteries based on the use of a digital oscilloscope and a special linear sweep device. Design/methodology/approach: To solve this problem, a test bench was developed on the basis of a solar radiation simulator. Findings: Practically it is proved that within the duration of a single pulse of 40 μs, it is possible to measure the voltage-current characteristics of an SB with a short-circuit current of up to 5.8 A. Research limitations/implications: The method is relevant for all types of solar batteries, but the measurements were carried out on serial samples of mono and polycrystalline silicon with a nominal output power of 30 to 140 W and a voltage of 12 V. Practical implications: The method can find its practical application in the development of an intelligent solar module. The technology of the intelligent module is based on the periodic removal of information on the operational parameters of the solar battery based on the measured voltage-current characteristic. Originality/value: Experimental confirmation of the effectiveness of the single-pulse measurement method of the voltage-current characteristic of a solar battery based on a linear current sweep.
Źródło:
Archives of Materials Science and Engineering; 2019, 99, 1/2; 24-29
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal assessment of a convective porous moving fins of different material properties using Laplace-variational iterative method
Autorzy:
Sobamowo, M. G.
Kamiyo, O. M.
Salami, M. O.
Yinusa, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/1030678.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Exact Method
Laplace-variational iterative method
Thermal response
Variable thermal conductivity
variational iterative method
Opis:
Investigation on thermal responses of different materials subjected to variant environmental condition has been a subject of ever-increasing research interest for decades. As such, research studies have shown different materials exhibiting peculiar characteristics of commercially used heat enhancement devices. Therefore, this work presents an investigation on thermal behaviour of a convective porous moving fins with temperature dependent thermal conductivity for five different materials. These materials include copper, Aluminium, Silicon nitride, Silicon carbide and Stainless steel. A hybrid method, viz- Laplace-variational iterative method (LVIM) is used to solve the model equation developed. And a perfect agreement is achieved when the result obtained from LVIM is verified with the exact solution. The result obtained shows that silicon carbide compete favourably with copper as the most efficient material in heat enhancement, while stainless steel shows the least performance. It is hoped that this work will serve as a template and a helpful tool for both scientist and engineers’ in future design of fins.
Źródło:
World Scientific News; 2020, 139, 2; 135-154
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
History of creation of the Mining Craft Faculty at the Katerynoslav Higher Technical Mining School (1900-1918)
Historia powstania Wydziału Sztuki Górniczej w Wyższej Technicznej Szkole Górniczej w Jekaterynosławiu (1900-1918)
Autorzy:
Bondarenko, V.I.
Kuzmenko, O.M.
Dychkovskiy, R.O.
Kovalevska, I.A.
Powiązania:
https://bibliotekanauki.pl/articles/350532.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Ukraina
górnictwo
szkolnictwo wyższe
Ukraine
mining
education
Opis:
The period of creation of leader faculty at National Mining University in Dnipropetrovsk (Ukraine) is considered. The basic scientific and methodological publications and researches are resulted. Situation in Ukraine mining in the beginning of 20th century are submitted.
W artykule przedstawiono proces powstawania Wydziału Górniczego, jednego z najważniejszych Wydziałów Narodowego Uniwersytetu Górniczego w Dniepropietrowsku (dawniej Jekaterynosław) na tle sytuacji górnictwa ukraińskiego na początku XX wieku. Zaprezentowano główne kierunki działalności naukowej Wydziału oraz najważniejsze osiągnięcia badawcze.
Źródło:
Górnictwo i Geoinżynieria; 2005, 29, 3/2; 13-23
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prooxidant–antioxidant system and change of alkaloids level in jimson weed (Datura stramonium L.) under the influence of static magnetic field
Wpływ stałego pola magnetycznego na układ prooksydacyjny i antyoksydacyjny oraz zmianę zawartości alkaloidów w bieluniu dziędzierzawie (Datura stramonium L.)
Autorzy:
Beno, Yu.J.
Zyn, A.R.
Brezvyn, O.M.
Dyka, M.V.
Powiązania:
https://bibliotekanauki.pl/articles/13090389.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Źródło:
Agronomy Science; 2017, 72, 3; 51-59
2544-4476
2544-798X
Pojawia się w:
Agronomy Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Survival potential of Phytophthora infestans sporangia in relation to environmental factors and late blight occurrence
Autorzy:
Olanya, O.M.
Anwar, M.
He, Z.
Larkin, R.P.
Honeycutt, C.W.
Powiązania:
https://bibliotekanauki.pl/articles/65009.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
survival
Phytophthora infestans
sporangia
environmental factor
late blight
occurrence
climate variability
potato
tomato
Opis:
Potato is an important crop globally and late blight (Phytophthora infestans) often results in severe crop loss. The cost for late blight control can be in excess of $210 million in the United States. We utilised a non-parametric density distribution analysis of local temperature (T) and relative humidity (RH), from 2005 to 2009, to assess and validate sporangia survival potential using survival model and late blight risks during the potato cropping season at Presque Isle, in the northern part of the state of Maine, USA. Modelbased analyses showed that ambient temperatures of 3−30°C and RH values of 45−100% were conducive for sporangia survival. Disease outbreaks and risk periods coincided with a high sporangia survival probability (15−35%). Due to the omission of solar radiation (SR) in the computation of survival potential in previous research, we applied a Cox proportional model to estimate the probability of sporangia survival [i.e. hazard at a specific time H(t)] as a function of baseline hazard (H0) and the influencing parameters. The model is: H(t) = H0(t) × exp(0.067ET + 0.138T + 0.083RH + 0.001SR) where ET is exposure time. The survival model indicated that RH (β = 0.083) and T (β = 0.138) were significant (p < 0.05) factors in sporangia survival in comparison to SR (β = 0.001). The hazard ratio, indicative of sporangia survival risk, varied with the predictors. For the unit increase of T, sporangia survival hazard increased by 1.148 times. The Cox model and sporangia hazard probabilities can be used for short-term disease forecasts based on the risk period most conducive for pathogen survival and targeted fungicide applications for optimum late blight management.
Źródło:
Journal of Plant Protection Research; 2016, 56, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pterosauria of the Great Oolite Group (Bathonian, Middle Jurassic) of Oxfordshire and Gloucestershire, England
Autorzy:
O’Sullivan, M.
Martill, D.M.
Powiązania:
https://bibliotekanauki.pl/articles/21923.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
The current understanding of UK Middle Jurassic pterosaur taxonomy is under-developed, leading to it being previously considered a time of low diversity. This is despite the presence of a productive but under-studied pterosaur-bearing horizon extending over parts of Oxfordshire and Gloucestershire. This unit, informally called the Stonesfield Slate, is part of the Great Oolite Group and it produces the largest number of Middle Jurassic pterosaurs. There are over 200 specimens distributed across museums in the United Kingdom, America, and Australia, almost all of which are accessioned under the genus Rhamphocephalus and referred to three species: the type species Rhamphocephalus prestwichi, Rhamphocephalus bucklandi, and Rhamphocephalus depressirostris. This study reviews the British Middle Jurassic Pterosauria assemblage, evaluating both their systematics and taxonomic diversity. The holotype of Rhamphocephalus, an isolated skull table, is found to be a misidentified crocodylomorph skull and the genus is considered a nomen dubium. The holotype of Rhamphocephalus bucklandi is identified as missing and that of Rhamphocephalus depressirostris has characters diagnostic at a family level, not a generic or specific one. Both species are considered dubious. Detailed examination of the entire assemblage shows that rather than being monogeneric, the assemblage contains at least five pterosaur taxa, representing three families. This diversity includes the potential earliest occurrences of both Monofenestrata and Pterodactyloidea. A new genus, Klobiodon rochei gen. et sp. nov. is described based on a well-preserved mandible. The English Bathonian pterosaur assemblage is shown to be diverse and indicates that, as has been suggested in other studies, the low-diversity signal in the Middle Jurassic is at least partially artificial.
Źródło:
Acta Palaeontologica Polonica; 2018, 63, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Macroevolutionary and morphofunctional patterns in theropod skulls: A morphometric approach
Autorzy:
Foth, C.
Rauhut, O.W.M.
Powiązania:
https://bibliotekanauki.pl/articles/21033.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
macroevolution
theropod dinosaur
skull
Theropoda
feeding ecology
biomechanics
evolution
Mesozoic
paleontology
Opis:
Theropod dinosaurs are one of the most remarkable lineages of terrestrial vertebrates in the Mesozoic, showing high taxo− nomic and ecological diversity. We investigate the cranial diversity of non−avian theropods and some basal birds, using geometric morphometrics to obtain insights into the evolutionary modifications of the skull. Theropod skulls mostly vary in the shape of the snout and length of the postorbital region (principal component [PC] 1), with further variation in orbit shape, depth of the postorbital region, and position of the jaw joint (PC 2 and PC 3). These results indicate that the cranial shape of theropods is closely correlated with phylogeny and dietary preference. Skull shapes of non−carnivorous taxa dif− fer significantly from carnivorous taxa, suggesting that dietary preference affects skull shape. Furthermore, we found a significant correlation between the first three PC axes and functional proxies (average maximum stress and an indicator of skull strength). Interestingly, basal birds occupy a large area within the morphospace, indicating a high cranial, and thus also ecological, diversity. However, we could include only a small number of basal avialan species, because their skulls are fragile and there are few good skull reconstructions. Taking the known diversity of basal birds from the Jehol biota into account, the present result might even underestimate the morphological diversity of basal avialans.
Źródło:
Acta Palaeontologica Polonica; 2013, 58, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparing measures of religiosity and spirituality in the experience of emotions – Development and Validation of a Scale of Non-Spiritual Religiosity
Autorzy:
Da Silva, João P.
Pereira, Anabela M.S.
Monteiro, Sara O.M.
Bartolo, Ana
Powiązania:
https://bibliotekanauki.pl/articles/2122002.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Religiosity
spirituality
emotions
scale
psychology
Opis:
This study aimed to compare measures of religiosity and spirituality in the experience of positive and negative emotions. For this purpose, a measure of non-spiritual religiosity (Religious Sense Scale) was developed. Method: The study has been conducted on a sample of 279 participants aged between 19 and 69 (M=24.42, SD=9.463) who completed a questionnaire that included the Religious Sense Scale, the Portuguese version of the Spiritual Well-being Questionnaire and the abridged Portuguese version of the Positive and Negative Affect Schedule. Findings: The was found to have excellent metrical properties for the measurement of religiosity or “religious sense”. Religious individuals differ from spiritual ones in the experience of emotions: spirituality tends to a greater experience of positive affect and religiosity to negative affect.
Źródło:
Polish Psychological Bulletin; 2020, 51, 1; 51-61
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fog computing and Big data in projects of class smart city
Autorzy:
Duda, O. M.
Kunanets, N. E.
Matsiuk, O. V.
Pasichnyk, V. V.
Rzheuskyi, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/411044.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
cloud technology
foggy computing
Big data
information technology platform
smart city
Opis:
The possibilities of using the information technology of foggy computing, which implements the processes of selecting primary messages from sensory nodes and their processing, and further transferring the results of primary computing to server environments based on information technology platforms of cloud type are analyzed in the article. It is noted that both of the approaches – mist and cloud computing – can be effectively used in a wide range of applications, in particular those that are used in information and technology complexes of “smart cities”. The system of parameters which distinguishes a separate class of information technologies called Big data is analyzed in the paper. The analysis made it possible to fix 10 basic parameters of the so-called 10 v, with the help of which a separate class of information technologies is allocated. Big data technologies, along with the technologies of foggy and cloud computing are elements of a powerful information technology platform that allows us to solve a wide range of problems for smart cities. The authors illustrated the system-technological connections of these classes of information technologies and analyzed the possibilities of their use in the context of implementation of the information technology project “Ternopil Smart city”.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2018, 7, 3; 7-12
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of concrete made with abakaliki quarry dust as fine aggregate using Scheffe’s optimization Model
Autorzy:
Chiemela, C.
Okoye, P.C.
Nwosu, P.C.
Oke, O.M.
Ohakwe, C.N.
Powiązania:
https://bibliotekanauki.pl/articles/11178.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
In recent years, Nigeria has witness rapid development especially in the area of infrastructural development like roads, bridges, buildings etc. The conventional methods used in concrete mixing have its own peculiar problems, like time wasting, material wasting and errors. These problems have been the cause of structural failures which has given rise to loss of life and properties. Hence the need to development a method that will take care of all these anomalies witness in the conventional method. This work is aim at removing these anomalies by the use of Scheffes optimization method. This optimization method can predict the compressive strength of a concrete given the mix ratios and also predict the mix ratios required to give a compressive strength for a particular concrete made by completely replacing river sand with quarry dust. With this method it will be easy to predict the compressive strength of concrete based on the type of structure it is to be used for, there by eliminating the problems associated with structural collapse due to errors in concrete mixing by conventional method.
Źródło:
International Letters of Natural Sciences; 2014, 15, 2
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Developing a set of measures to provide maximum hydraulic efficiency of gas gathering pipelines
Autorzy:
Volovetskyi, V. B.
Uhrynovskyi, A. V.
Doroshenko, Ya. V.
Shchyrba, O. M.
Stakhmych, Yu. S.
Powiązania:
https://bibliotekanauki.pl/articles/368779.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
well
gas
gas gathering pipeline
hydraulic efficiency
cleaning the inner cavity of pipelines
studnia
gaz
rurociąg
sprawność hydrauliczna
Opis:
Purpose: The purposes of this article are to study the effective ways of increasing the hydraulic efficiency of gas gathering pipelines of the Yuliivskyi oil and gas condensate production facility (OGCPF); to calculate the operation efficiency of gas gathering pipelines of the Yuliivskyi OGCPF and develop a set of measures to monitor their condition and improve their hydraulic characteristics; to investigate the technology of cleaning the inner cavity of flowlines of gas-condensate wells with foam, to perform the feasibility study on the prospects of its application in practice. Design/methodology/approach: The technology of cleaning the inner cavity of flowlines of gas-condensate wells with foam was investigated to objectively evaluate its application and determine the effectiveness of this measure. The research was carried out within the framework of research and development work by the specialists of the Ukrainian Scientific Research Institute of Natural Gases. Findings: The results of production studies showed that due to cleaning the flowlines of gas-condensate wells (No.85 and No.60) from the accumulation of liquid, the coefficients of their hydraulic efficiency increased by 12% and 7%, respectively. Measures taken to clean the inner cavity of the flowlines from liquid have proven their efficiency and can be recommended for other flowlines of wells at other production fields. Research limitations/implications: Based on the characteristics of gas gathering pipelines, it is reasonable to conduct experimental studies on the use of the proposed technology of cleaning the inner cavity with foam in the case of increasing its multiplicity. Practical implications: Using the wells of the Yuliivske oil and gas condensate field as case studies, the operating parameters were measured and the pressure losses along the length of the flowlines were calculated. According to the results of calculations at two wells (No.85 and No.60), a significant excess of the actual value of the flow friction characteristic over the theoretical value was established. To reduce excessive pressure losses due to the presence of liquid and improve the hydraulic characteristics of the wells, their inner cavities were cleaned using foam with the expansion ratio from 40 to 100. Originality/value: It is important to note that the advantages of foam piston include: ease of use, no occurrence of hydraulic shocks and preventing stuck during movement in the gas pipeline, application in both straight and inclined sections, no wear of the elements of the cleaning equipment, a rather efficient cleaning of gas pipelines.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2020, 101, 1; 27-41
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Analysis of Jump and Bifurcation Phenomena in a Forced Vibration of Geometrical Nonlinear Cantilever Beam: Application of Differential Transformation Method
Autorzy:
Sobamowo, M. G.
Yinusa, A. A.
Adeleye, O. A.
Oyelade, A. O.
Sadiq, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1031911.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Bifurcation Phenomenon
Differential transformation method
Jump phenomenon
Nonlinear vibration
Phase plane
Opis:
One of the classical features exhibited in nonlinear dynamics of engineering systems is the jump phenomenon, which is the discontinuous change in the steady state response of a system as a parameter is slowly varied. Such phenomenon is characterized by large amplitude dynamic responses of systems to small amplitude disturbances. It is established that this phenomenon cannot be described by the standard asymptotic and perturbation methods because they are limited to the study of small amplitude responses to small disturbances. Therefore, this paper presents the application of differential transformation method-Padé approximant to the solution of jump and bifurcation phenomena for a geometrical nonlinear cantilever beam subjected to a harmonic excitation. The accuracy and validity of the analytical solutions obtained by the differential transformation method are shown through a comparison of the results of the analytical solution with the corresponding results of the numerical solution obtained by fourth-order Runge-Kutta method and also with the results in a past study using harmonic balancing method. With the aid of the differential transformation method-Padé approximant, the effects of the nonlinear parameters in the model equation on the dynamic response of the beam are investigated. Also, the sensitivity of the beam to the external excitation amplitude is analyzed. In the distributed forced vibration, the jump phenomenon appeared in the response amplitude by variation of the excitation frequency while in the resonance frequency, the beat phenomenon with harmonic motion is seen for low level of excitation amplitude. At a certain frequency, the jump and bifurcation phenomena are seen in the curves of responses versus excitation amplitude. Additionally, the plots of the phase plane and time history of the system response are shown. It is established that the differential transformation method is a very useful mathematical tool for dealing with the nonlinear problems.
Źródło:
World Scientific News; 2020, 140; 26-58
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reducing Musculoskeletal Discomfort: Effects of an Office Ergonomics Workplace and Training Intervention
Autorzy:
Robertson, M. M.
O’Neill, M. J.
Powiązania:
https://bibliotekanauki.pl/articles/89721.pdf
Data publikacji:
2003
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
musculoskeletal
office ergonomics
intervention
praca biurowa
choroby narządów ruchu
fizjologia pracy
ergonomia
pomieszczenie biurowe
zagrożenia zdrowia
kręgosłup
pozycja przy pracy
Opis:
Effects of an office ergonomics workplace and training intervention on workers’ knowledge and self-reported musculoskeletal pain and discomfort were investigated. An instructional systems design process was used to develop an office ergonomics training program and the evaluation tools used to measure the effectiveness of the training program on workers’ office ergonomics knowledge and skills. It was hypothesized that the training and workplace intervention would allow the worker to more effectively use their workplace through increased office ergonomics knowledge and skills. Following the intervention, there was a significant increase in workers’ office ergonomics knowledge and awareness. Self-reported work-related musculoskeletal disorders significantly decreased for the group who had a workplace change and received ergonomic training relative to a workplace change-only group and a no intervention control group.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2003, 9, 4; 491-502
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of mechanical vapour compression refrigeration system part 2: performance challenge
Autorzy:
Mahmood, R. A.
Ali, O. M.
Al-Janabi, A.
Al-Doori, G.
Noor, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/2106451.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
para
układ chłodniczy
współczynnik wydajności
vapour compression
refrigeration system
cycle
coefficient of performance COP
Opis:
Reducing energy consumption and providing high performance for a vapour compression refrigeration system are big challenges that need more attention and investigation. This paper provides an extensive review of experimental and theoretical studies to present the vapour compression refrigeration system and its modifications that can be used to improve system’s performance and reduce its energy consumption. This paper also presents the challenges that can be considered as a gab of research for the future works and investigations. Cooling capacity, refrigerant effect, energy consumption can be improved by using vapour injection technique, natural working fluid, and heat exchanger. Based on the outcome of this paper, vapour injection technique using natural refrigerant such as water can provide ultimate friendly refrigeration system. Future vision for the vapour compression refrigeration system and its new design technique using Computational Fluid Dynamic (CFD) is also considered and presented.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 119--130
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Informative testing method of beer sewage samples for mini-breweries
Autorzy:
Pyrozhenko, Ye. V.
Sebko, V. V.
Zdorenko, V. G.
Zashchepkina, N. M.
Markina, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1818486.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
brewing technological process
sewage
informative methods
control
eddy current devices
proces technologiczny warzenia piwa
ścieki
metody informacyjne
kontrola
Opis:
Purpose: of the article is to investigate the theoretical rules of thermal transformer eddy current converter (TTC) during the preparation of ecological monitoring of brewery sewage samples based on the implementation of contactless two-parameter eddy current method of testing of the specific electrical conductivity λt and the temperature t of the beer sewage sample. It should be noted that this makes it possible to simultaneously prevent the causes of beer sewage samples deviation from the specified environmental safety indicators and to take adjustments. Design/methodology/approach: The theory of TTC operation concerning the electrical and temperature characteristics testing of beer sewage samples has been further developed by implement new universal transformation functions Δφt = f (Gt) and Δφ = f (xt), which relate the normalized difference components of the converter signals to physical and chemical characteristics of the sample. Due to this, it is possible to simultaneously prevent the causes of beer sewage samples deviation from the specified ecological safety indicators and to take appropriate adjustments. Findings: The method of two-parameter measuring test of the specific electrical conductivity λt and the temperature t of the beer sewage sample was developed on the basis of new universal transformation functions. Analysing the numerical data of electrical conductivity λ, TDS and pH at the initial temperature t1 = 15°C, the alkaline nature of beer sewage was determined. Research limitations/implications: The frequency range of the magnetic field f = 80-100 MHz, it is difficult to maintain in laboratory conditions, so the proposed method requires the use of modern high-frequency equipment, the radius of the probe depends on the radius of the primary converter frame. And therefore is quite a complicate to find appropriate tank. Practical implications: is to determine the nature of beer sewage based on the results of electrical and temperature parameters measurements during implementing a two-parameter eddy current method, which allows to prevent the reasons for beer sewage samples deviations from the specified environmental safety measures and to take appropriate adjustments. An important practical result is also the determination of the signal components and the normalized characteristics of the primary eddy current converter with a sample of beer sewage. They allow to calculate, design and create multi-parameter automated devices for measuring test of the physicochemical parameters of beer sewage samples. In turn, as a result of the physicochemical composition analysis of the sample, improving the accuracy of measurements of physicochemical parameters - there is an opportunity to improve and create advanced methods of wastewater purification on a weak electrolytic basis. Originality/value: The article originality is the investigation of the theoretical rules of thermal TTC by implementing a new multi-parameter eddy current method of measuring the specific electrical conductivity λt and the temperature t of the beer sewage sample based on the implementation of universal transformation functions Δφt = f (Gt) and Δφ = f (xt) that relate the converter signals to the physicochemical characteristics of the beer sewage sample, which helps to prevent the causes of the beer sewage samples deviation from the specified environmental safety indicators and take appropriate adjustments.
Źródło:
Archives of Materials Science and Engineering; 2020, 106, 1; 28--41
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drummondin E and Flinderole B are potential inhibitors of RNA-dependent RNA polymerase of SARS-CoV-2: an in silico study
Autorzy:
Akhtar, N.
Verma, H.
Silkari, O.M.
Upadhyay, A.K.
Kaushik, V.
Mannan, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/2096249.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
RNA polymerase
SARS-CoV-2
RNA-dependent
Drummondin E
Flinderole B
Opis:
Coronavirus disease 2019 caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has affected 235.6 million people worldwide. In the present study, RNA-dependent RNA polymerase (RdRp) (PDB Id: 6M71) of SARS-CoV-2, an essential enzyme needed for subgenomic replication and amplification of RNA, was selected. Similar to other RdRps, it is a conserved protein and a popular target for antiviral drug therapy. Based on a computational approach, potential RdRp inhibitors were identified. The absorption, distribution, metabolism, excretion, and toxicity (ADMET) of selected molecules were determined using computation tools. The potential inhibitors were docked to the RdRp and later confirmed by Molecular Dynamics (MD) using the “Flare” module of Cresset software. Drummondin E and Flinderole B had higher drug similarity scores among the compounds selected in this study. Both these compounds are noncarcinogenic, nonirritant, nontumorigenic, and nonmutagenic. Molecular docking studies showed that both compounds can bind to RdRp. The best ligand interaction patterns were validated by MD using the “Flare” module. MD was performed for the period of 100 ns with the time step of 1 fs. The simulation results suggest that Thr-680, Arg-624, Lys-676, and Val-557 are key interacting partners in the Drummondin E-RdRp complex, while Asp-618, Asp-760, Asp-623, Arg-624, and Asp-761 are the interacting partners in the Flinderole B-RdRp complex. Based on the in silico drug-likeness score; ADMET properties; and molecular simulation result, we surmise that Flinderole B and Drummondin E could impede SARS-CoV-2 genome replication and transcription by targeting the RdRp protein.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2022, 103, 1; 53-70
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Active system for reduction of noise parameters of car muffler with the use of pressure sensors based on silicon microcrystals
Autorzy:
Zinko, R.V.
Kutrakov, A.P.
Shybanov, S.V.
Zashchepkina, N.M.
Markina, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/2175781.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
active noise damping
car mufflers
noise reduction
high-temperature pressure sensors
filamentary crystals
aktywne tłumienie hałasu
tłumiki samochodowe
redukcja hałasu
wysokotemperaturowe czujniki ciśnienia
kryształy włókniste
Opis:
Purpose: The article contains the results of research and development of a system for active noise damping of an automobile engine. The proposed system of active noise suppression can significantly reduce the sound pressure level in the frequency band up to 500 Hz. The robotic principle of the developed system is based on the addition of an additional buffer tank with a variable volume in the silencer system. The use of high-temperature sensors with strain gauges based on silicon microcrystals to obtain information on the parameters of sound vibrations arising during the exhaust gas outflow made it possible to create a control system for changing the volume of the buffer tank. The results of testing the proposed system of active noise suppression of an internal combustion engine are presented. Design/methodology/approach: The active noise suppression system based on the Helmholtz resonator used tools to control general noise levels, experimental tests, complex mathematical modelling of acoustic processes in Solidworks, taking into account the conditions of propagation and attenuation of sound energy by intermediate closed volumes. Findings: The use of an additional resonator chamber with variable volume in the exhaust muffler of the internal combustion engine allowed to reduce the resonant phenomena in the zone of low-frequency pulsations of exhaust gas pressure from 57 Hz to 43 Hz at frequency drift in the range of 310… 350 Hz, which significantly improved its noise characteristics. Research limitations/implications: For further research, to improve the characteristics of the active noise suppression system, it is advisable to consider the use of several in in transient modes of engine operation. Practical implications: The developed design of active noise reduction is simpler in comparison with analogs and allows reducing the noise of exhaust gases in a low-frequency range. Originality/value: To reduce the noise, a variable-volume Helmholtz resonator was used, the efficiency of which is provided by high-temperature sensors of the original design.
Źródło:
Archives of Materials Science and Engineering; 2021, 109, 1; 35--41
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Four-parameter electromagnetic method for determining the parameters of brewery effluents
Autorzy:
Sebko, V. V.
Pyrozhenko, Ye. V.
Zashchepkina, N. M.
Zdorenko, V. G.
Markina, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/2201046.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
four-parameter electromagnetic method
brewery effluents
magnetic flux probe
MFP
conversion function
joint measurement
electrical conductivity
relative permittivity
density
temperature
metoda elektromagnetyczna
ścieki
strumień magnetyczny
funkcja konwersji
przewodność elektryczna
względna przenikalność elektryczna
gęstość
temperatura
Opis:
Purpose of the article is to study a four-parameter electromagnetic method for joint measurements of electrical resistivity k, relative permittivity εr, temperature t and density ρ of samples of acidic, alkaline and average effluents from a microbrewery based on a magnetic flux probe (MFP), which considers the influence of informative parameters of beer effluents on the components of the amplitude and phase signals of a multiparameter device. Design/methodology/approach The implementation of the four-parameter method is carried out on the basis of the dependences G1 = f (A1) and G2 = f (A2) at two frequencies of the electromagnetic field f0 and f1 for acid, alkaline and average effluent and allows you to jointly determine the four parameters of effluent samples with the same converter in the same control area. The proposed method makes it possible to improve the accuracy of identifying effluent samples since the obtained multiparameter information makes it possible to determine the nature and properties of effluent samples using only one transducer with certain physical characteristics. The research results lead to the expansion of the technical capabilities of electromagnetic measurement methods, as well as to an increase in the metrological characteristics of electromagnetic transducers and an increase in the accuracy of measuring the parameters of effluent samples compared to reference methods and measuring instruments. Thus, the implementation of this approach contributes to the prediction and prevention of the reasons for the deviation of beer effluent samples from the specified indicators of environmental safety. Findings The universal conversion functions MFP have been established, connecting the amplitude and phase components of the converter signals with the parameters k, εr, t and ρ of acidic, alkaline and average effluents. Based on the universal transformation functions G1 = f (A1) and G2 = f (A2), a four-parameter electromagnetic method for joint measurements of electrical resistivity k, relative permittivity εr, temperature t and density ρ of acidic, alkaline, and average effluents from breweries has been developed. When conducting research at two close frequencies of the electromagnetic field f0 = 20.3 MHz and f1 = 22 MHz, algorithms were obtained for measuring and calculating procedures for determining k, εr, t and ρ for samples of acidic, alkaline and average effluents from the brewing industry. Research limitations/implications Research perspectives consist in the creation of automated systems for multiparameter measuring control of the physicochemical characteristics of acidic and alkaline effluent from food and processing industries based on the immersed electromagnetic transducer. Based on the data obtained using informative methods to measure the parameters of effluent samples, an integrated method for treating beer effluents of various compositions will be proposed. At the same time, the scheme of the integrated treatment method should include a filter that provides the introduction of a magnetic fluid and a separation device that allows us to remove a fraction, including pollution in itself. Practical implications Is that the proposed four-parameter electromagnetic method makes it possible to determine to what composition the controlled samples of wastewater should be attributed (acidic or alkaline). It, in turn, makes it possible to choose a rational method for treating beer effluents and to prevent the reasons for the deviation of effluent samples from the environmental safety indicators set by the standards. Originality/value of the article is the research related to the expansion of the functional and technical capabilities of the electromagnetic two-frequency transducer MFP through the implementation of a four-parameter electromagnetic method of joint measurements of electrical resistivity k, relative permittivity εr, temperature t and density ρ of acidic, alkaline and average effluents from breweries. The universal transformation functions G1 = f (A1) and G2 = f (A2) found in the work at two close magnetic field frequencies, f0 = 20.3 MHz and f1 = 22 MHz, make it possible to control four physicochemical parameters of acidic, alkaline and average wastewater at the same time by the same MFP. An algorithm has been developed for determining the signal components of a two-frequency thermal MFP, the ranges of which correspond to the ranges of changes in electrical resistivity k, relative permittivity εr, temperature t and density ρ of acidic, alkaline, and average brewery effluents. The basic relations that describe the two-frequency four-parameter electromagnetic method of joint measurements of the physicochemical parameters of acidic, alkaline and averaged beer effluents have been obtained.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 113, 2; 49--64
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impregnating storage materials with neem seed oil against Callosobruchus maculatus Fabricus (Coleoptera: Chrysomelidae: Bruchinae) in Stored Bambara Seeds (Vigna subterranean L.) Verdcourt
Autorzy:
Ojiako, F.O.
Zakka, U.
Dialoke, S.A.
Ahuchaogu, C.E.
Nnebue, O.M.
Izuogu, C.P.
Powiązania:
https://bibliotekanauki.pl/articles/11675.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
Neem (Azadirachta indica A. Juss.) seed oil (NSO) is acclaimed to have some form of insecticidal action against more than 400 insect species in at least 10 to 13 orders. The main delimitating factor in the wide acceptance of this well tested plant as a storage pest bioinsecticide is its foul sulfurous smell and bitter taste which impinges on the acceptability and marketability of treated produce. To ameliorate this shortfall, therefore, an assessment of the potential of impregnating different storage materials; [plastic containers (PLC), Bagco bags (BCB), Black polyethylene bags (BPB), white polyethylene bags (WPB) and calico bags (CAB)], with NSO in the management of Callosobruchus maculatus (F.) in stored Bambara seeds (Vigna subterranea L.), was conducted in the laboratory. The experiment was laid out in a 4 x 5 factorial arrangement fitted into a completely randomized design (CRD). Factor A represented four concentrations of NSO (0.00, 0.50, 1.00, 1.50 ml/ 100g seed), while factor B were the five different storage materials. The treatments were replicated four times Generally, seeds stored with impregnated storage materials recorded more bruchids mortality, reduced oviposition rate, decreased number of emerged insects (F1 and F2) and had less damaged seeds (and hence decreased weevil perforation index, WPI) than the control. Concentration performance was dose related though the highest (1.50 %) did not differ statistically (P=0.05) from the medium (1.00 %) concentration. Seeds stored in BPBs had the highest mortalities, but recorded the lowest in number of eggs oviposited, egg/seed ratio, F1, F2 and cumulative emergence, respectively. These results differed significantly (P=0.05) with the seeds stored in other materials. BPB stored seeds were also the least damaged with lowest exit holes/seed, seeds with holes and WPI, respectively. The performance of BPB was closely followed by seeds stored in WPBs in all the parameters tested. Conversely, seeds stored in BCBs recorded the lowest mortalities but the highest in all other parameters assessed. Other storage materials (PLC and CAB) had better storage quality than BCB materials. Impregnation of storage materials with NSO could be a better option to direct seed application with its attendant drawback. The use of NSO impregnated black polyethylene bags, within the scope of the storage materials screened, to control damage by C. maculatus in stored Bambara seeds, should be encouraged.
Źródło:
International Letters of Natural Sciences; 2016, 52
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrasonic method of quality control for textile materials
Autorzy:
Zashchepkina, N. M.
Zdorenko, V. G.
Tierentyeva, N. R.
Markina, O. M.
Markin, M. O.
Bozhko, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/378534.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
control
quality
textile materials
ultrasonic method
kontrola
jakość
materiały tekstylne
metoda ultradźwiękowa
Opis:
Purpose: The ultrasonic amplitude method for controlling the surface texture density of textile materials was first studied and used. Design/methodology/approach: For the first time, the surface texture density has been determined. The research was conducted using the ultrasonic method, rather than by mathematical calculations, which made it possible to invent a new approach to contactless quality control of textile materials. In order to identify the functionality of bicomponent textile material, formed from raw materials with opposite hygroscopic properties, two-layer knitted fabrics were chosen to protect the human respiratory organs. As a hydrophilic type of raw material used yarn with composition is as follows – cotton 34%, flax 33%, viscose 33%, and in the function of a hydrophobic raw material, polypropylene multifilament yarn. Using the ultrasonic method, studies of a new type of knitwear were carried out, the values of the surface density of the material were obtained. Products from this composition provide respiratory protection from dust and comfortable work in the area of road repairs up to 8 hours. Findings: The combination of natural and synthetic materials for individual masks allowed them to be used under different operating conditions. The problem of structure and design of materials was resolved through the use of computer technology and computer-aided design of textiles, and the possibility of applying the ultrasonic amplitude method to control the surface density of textile materials was substantiated. During the analysis of the results of experimental studies, it was found necessary to ensure the uniformity of the physical and mechanical properties of textile materials in the production process. Using the ultrasonic method, the thickness gauge was used to determine the surface density of various materials for the manufacture of personal protective equipment for road maintenance workers. Research limitations/implications: The method of measurement has been tested and has no limitations. However, the study was conducted on samples of textile materials that were manufactured in Ukraine and according to patents of authors. Practical implications: Individual masks for the protection of human respiratory organs are recommended for use by road workers and cyclists. Originality/value: The originality of the results of the article is the experimental data of studies on the content of textile materials and the accuracy of measuring their surface density by an ultrasonic contactless device.
Źródło:
Archives of Materials Science and Engineering; 2019, 97, 1/2; 39-49
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Developing a complex of measures for liquid removal from gas condensate wells and flowlines using surfactants
Autorzy:
Volovetskyi, V.B.
Doroshenko, Ya.V.
Kogut, G.M.
Rybitskyi, I.V.
Doroshenko, J.I.
Shchyrba, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/2175794.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
well
gas
flowline
gas pipeline
liquid removal
hydrocarbon extraction
internal cavity cleaning
studnia
gaz
linia przepływu
gazociąg
usuwanie cieczy
ekstrakcja węglowodorów
czyszczenie wnęk wewnętrznych
Opis:
Purpose: The purpose of this work is to consider the complications that arise while operating gas condensate wells, in particular, the accumulation of hydrocarbon condensate, formation and condensation water at wells and flowlines, to develop a method for removing liquid from wells and flowlines before it entering a gas treatment unit and being treated with surfactants and to develop a method for the foam destruction in the gas-liquid flow. Design/methodology/approach: The operational parameters of gas-condensate wells of the Yuliivske oil and gas condensate field (OGCF) have been analysed. Wells have been identified that are operated in difficult conditions due to the accumulation of the liquid at the bottom hole and in flowlines. The volume of the liquid accumulated at the bottom hole of gas condensate wells is estimated. The quantity of surfactants, the volume and concentration of the solution required to remove the liquid were calculated individually for each well. The program of experimental researches has been made. The efficiency of the application of surfactant solution was experimentally determined and a positive result was achieved in the form of an increase in production by 10%. A new approach to the use of surfactant solution, as well as the foam destruction, has been proposed. The studies were performed within the framework of research and development work by the specialists of the Ukrainian Scientific Research Institute of Natural Gases. Findings: Comprehensive measures are proposed to increase the efficiency of gas condensate wells operation. They are monitoring of operational parameters of wells by pressure and temperature gauges installed at the wellhead and at the inlet gas pipelines of the gas treatment unit; calculation of the volume of accumulated fluid in the wellbore and flowline; installation of a complex of automated feeding a surfactant solution of both in the annulus of the wells and in the flowline. For this purpose, two options for the complex and and have a different principle of operation. To prevent foam from entering the gas treatment unit, a method of its destruction has been proposed. The implementation of the proposed comprehensive measures will allow controlling the well operation mode, timely liquid removal from the well and the flowline and ensure stable hydrocarbon production. Research limitations/implications: The obtained results of laboratory and experimental studies have shown that using a surfactant solution is reasonable to remove the liquid from gas condensate wells. To increase the efficiency of the measure, a new method of feeding surfactant solution was developed by installing a unit for automated feeding (UAF) of a surfactant solution at the mouth. Practical implications: The results of laboratory tests allow using a surfactant solution reasonably in order to remove the liquid from gas condensate wells, as well as possible further destruction of foam in the gas-liquid flow for increasing both the efficiency of the extraction and production volume. Originality/value: On the basis of previously performed experimental research, it has been established that it is advisable to use a surfactant solution to remove the liquid from gas condensate wells and flowlines. A new method of removing liquid from gas condensate wells and flowlines has been developed, as well as a method of destroying foam in a gas-liquid flow, which are original and can be implemented.
Źródło:
Archives of Materials Science and Engineering; 2021, 108, 1; 24--41
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of lycopene and astaxanthin in feed on metabolic parameters of laying hens, yolk color of eggs and their content of carotenoids and vitamin A when stored under refrigerated conditions
Autorzy:
Shevchenko, L.V.
Iakubchak, O.M.
Davydovych, V.A.
Honchar, V.V.
Ciorga, M.
Hartung, J.
Kołacz, R.
Powiązania:
https://bibliotekanauki.pl/articles/2087136.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
feed additives
antioxidants
laying hens
blood biochemical parameters
egg yolkquality
Źródło:
Polish Journal of Veterinary Sciences; 2021, 24, 4; 525-535
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of sol-gel process for preparation of functional materials
Autorzy:
Gaishun, V. E.
Demidenko, O. M.
Kosenok, Y. A.
Kovalenko, D. L.
Semchenko, A. V.
Strek, W.
Powiązania:
https://bibliotekanauki.pl/articles/385165.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
sol-gel
colored silica film
rust-proofing inorganic covers
colloidal nanosized silica
Opis:
A development of high-performance materials for electronics, optics, ceramics fabrication is restrained by traditional modes of their production. Basic technologies for materials include high-temperature physical and chemical processes and require special conditions to attain desired properties of final products. Advanced preparation methods for materials with new features are feasible on the basis of colloid-chemical processes and nanochemistry. In this respect the sol-to-gel transformation followed by solidification and chemical modification are of great interest to attain a variety of different functional properties of materials.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 121-123
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Short History of the Faculty of Medicine at the Historical University of Trnava: 375th anniversary of the University of Trnava, Slovakia
Krótka historia Wydziału Lekarskiego Historycznego Uniwersytetu Trnawskiego: 375-lecie Uniwersytetu Trnawskiego (Słowacja)
Autorzy:
Chmelík, B.
Rusnák, M.
Bučko, L.
O'Mullane, M.
Powiązania:
https://bibliotekanauki.pl/articles/271492.pdf
Data publikacji:
2011
Wydawca:
Górnośląska Wyższa Szkoła Pedagogiczna im. Kardynała Augusta Hlonda
Tematy:
Słowacja
uniwersytet
edukacja
Pázmán
zdrowie publiczne
medycyna
Slovakia
University of Trnava
education
Pázmány
public health
medicine
Opis:
Trnava, a town in Slovakia, declared 2010 the "Year of Trnava University," in honor of the 375th anniversary of the university's founding. It was originally called "Universitas Tyrnaviensis", established in 1635 under the guidance of Cardinal Pázmány. The university was initially founded by the Jesuit Order and continues to exemplify traditional Christian values in its teaching and research activities. In 1777, Universitas Tyrnaviensis was officially closed and moved to present day Budapest, and the university doors did not open again until the foundation of the Slovak state in 1993 which prompted the reinstatement of the older college. The present day university builds on the rich heritage passed down by previous generations. The current day Faculty of Health Care and Social Work builds on the heritage and achievements of the School of Medicine, founded in 1769, which bore numerous esteemed scholars and practitioners. The current day university continues the legacies as established within the ethos of Universitas Tyrnaviensis, such as rekindling the focus on humanitarian activities, attaining high teaching standards in education and high levels in scientific research. Without doubt, the rich history and scholarly achievements of Trnava University constitute an important part of national Slovak history.
Trnawa, miasto na Słowacji, rok 2010 ogłosiło "Rokiem Uniwersytetu Trnawskiego", aby tym samym uczcić 375 rocznicę założenia uczelni. Utworzona w roku 1635 pod kierownictwem kardynała Pázmány, pierwotnie nazywana ona była "Universitas Tyrnaviensis". Uniwersytet ten został założony przez Towarzystwo Jezusowe i nadal stara się w swojej działalności pedagogicznej i badawczej egzemplifikować tradycyjne wartości chrześcijańskie. W roku 1777 Universitas Tyrnaviensis został oficjalnie zamknięty i przeniesiony do Budapesztu, a drzwi uczelni zostały ponownie otwarte dopiero w momencie powstania Państwa słowackiego w 1993 roku, co pozwoliło na wznowienie funkcjonowania działalności. Dzisiejszy uniwersytet opiera się na bogatym dziedzictwie przekazanym przez poprzednie pokolenia. Obecny Wydział Nauk o Zdrowiu i Pracy Socjalnej rozwija się w oparciu o dorobek i osiągnięcia Szkoły Medycznej, założonej w 1769 roku, które wykształciła wielu wielkich uczonych i ekspertów-praktyków. Obecny Uniwersytet kontynuuje spuściznę Universitas Tyrnaviensis, opierając się na wartościach takich jak przywracanie zainteresowania działalnością humanitarną oraz osiąganie wysokich standardów nauczania w zakresie edukacji i badań naukowych. Bez wątpienia, ze względu na bogatą historię i osiągnięcia naukowe, historia Uniwersytetu Trnawskiego jest ważną częścią historii Słowacji.
Źródło:
Journal of Ecology and Health; 2011, R. 15, nr 6, 6; 296-301
2082-2634
Pojawia się w:
Journal of Ecology and Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of synthesis conditions on the properties of FeXCoYOZ - nanoparticles in SiO2Sol-gel film
Autorzy:
Sidsky, V. V.
Gaishun, V. E.
Demidenko, O. M.
Savitskaya, T. A.
Panykov, V. V.
Semchenko, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/385204.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
nanoparticle
AFM
FexCoyOz
phase change
primitive and face-centered cubic lattice
Opis:
Synthesis conditions influence on structure of FexCoyOz - nanoparticle in SiO2 - sol-gel coating is discussed. The samples are synthesized by hybrid sol - gel method including following stages: TEOS hydrolysis, introduction into sol of Co(NO3)2 . 6H20 and Fe(NO3)3 . 9H20, deposition of film-forming sol by spin-coating on silica substrate, heat treatment at the temperature from 200 up to 900 °C. The Synthesis conditions influence on a specific structural property of sol gel films is investigated by AFM.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 91-92
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental effectiveness studies of the technology for cleaning the inner cavity of gas gathering pipelines
Autorzy:
Volovetskyi, V. B.
Doroshenko, Ya. V.
Tarayevs'kyy, O. S.
Shchyrba, O. M.
Doroshenko, J. I.
Stakhmych, Yu. S.
Powiązania:
https://bibliotekanauki.pl/articles/1818794.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
gas
foam
gas gathering pipeline
hydraulic efficiency
cleaning the inner cavity of pipelines
gaz
piana
rurociąg
sprawność hydrauliczna
Opis:
Purpose: The purposes of the article are to determine the hydraulic efficiency of two gas gathering pipelines of the Yuliivskyi oil and gas condensate production facility (OGCPF) and develop a set of measures to increase it; to experimentally determine the efficiency of using foams to increase the hydraulic characteristics of the gas gathering pipelines in the Yuliivskyi OGCPF; to develop a set of measures that will help to improve the hydraulic characteristics of gas gathering pipelines. Design/methodology/approach: The research methodology consists in determining the hydraulic efficiency of gas gathering pipelines before and after cleaning their inner cavity with foams with different expansion ratios and comparing the obtained values, which allows to objectively assess the efficiency of this cleaning method. The studies were performed within the framework of research and development work by the specialists of the Ukrainian Scientific Research Institute of Natural Gases. Findings: The pilot testing was carried out to determine the efficiency of cleaning the inner cavity of gas gathering pipelines with foams with different expansion ratios. It showed positive results. It was determined that cleaning the inner cavity of gas gathering pipelines with foams with the expansion ratio from 80 to 90 led to an increase in the hydraulic efficiency coefficient by 10.5%, and with foams with the expansion ratio from 50 to 60 - by 5.7%. The measures taken to clean the inner cavity of gas gathering pipelines from liquid contaminations have proven their efficiency and can be recommended for other fields. Research limitations/implications: The obtained results show that it is reasonable to conduct the experimental studies on the efficiency of cleaning the inner cavity of gas gathering pipelines with the foams with higher expansion ratios. To achieve the maximum quality of cleaning the gas gathering pipelines, it is necessary to develop a new method that will combine the use of foam and gel piston.Practical implications: The performed experimental studies help to take a more reasonable approach to cleaning the inner cavity of gas gathering pipelines with foams and to predict in advance the effect of the foam expansion ratio on the hydraulic efficiency of gas gathering pipelines. Originality/value: The experimental studies on the effect of foam expansion ratios on the hydraulic efficiency of gas gathering pipelines are original.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2021, 105, 2; 61--77
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of foam-breaking measures after removing liquid contamination from wells and flowlines by using surface-active substances
Autorzy:
Volovetskyi, V. B.
Doroshenko, Ya. V.
Stetsiuk, S. M.
Matkivskyi, S. V.
Shchyrba, O. M.
Femiak, Y. M.
Kogut, G. M.
Powiązania:
https://bibliotekanauki.pl/articles/2201061.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
well
gas
flowline
liquid removal
gas-fluid flow
foam breaking
odwiert
gaz
linia przepływu
usuwanie cieczy
przepływ gaz-ciecz
Opis:
Purpose The purpose is to consider the complications that arise during the operation of gas condensate wells, in particular, the accumulation of liquid contamination. Development of new approaches to improve the efficiency of the separation equipment performance of gas gathering and treatment systems when a multiphase flow enters. Development of a foam breaking method in a gas-liquid flow after removal of liquid contaminants from wells and flowlines using surfactants. Design/methodology/approach An analysis was made of the complications that may arise when removing liquid contaminants from wells and flowlines using surfactants. Measures have been developed that will make it possible to timely prevent the ingress of foam into the separation equipment of gas gathering and treatment systems. Using computational fluid dynamics (CFD) modelling, an effective foam-breaking device was developed by supplying stable hydrocarbon condensate. Findings A method to minimize the negative impact of foam on the operation of separation equipment after fluid removal from wells and gas condensate field flowlines using a surfactant solution was elaborated. A method for its breaking was proposed to prevent the flow of foam into the gas processing unit. This method foresees the application of the technological scheme layout for supplying a stable hydrocarbon condensate to a gas-liquid flow entering the separators of the first of separation, both the main line and the measuring line. CFD modelling was used to study the process of foam breaking by feeding hydrocarbon condensate into it. The influence of the hydrocarbon condensate supplying method on gas-dynamic processes (distribution of pressure, velocity, volumetric particles of phases), and the efficiency of foam breaking was estimated. It was established that the supply of hydrocarbon condensate from one branch pipe to the pipeline through which the foam moved did not ensure its complete breaking. To increase the efficiency of foam breaking, a device with designed four nozzles for supplying hydrocarbon condensate was developed. CFD modelling made it possible to substantiate that in this case, a pressure reduction zone appeared at the place of condensate supply. Because of a sharp change in pressure, a strong improvement in the effect of foam breaking occurred. The understanding of the regularities of foam breaking processes by hydrocarbon condensate was obtained, and the design of a device for the complete foam breaking was developed. Research limitations/implications The obtained results of laboratory studies have shown that a sharp decrease in the stability of the foam occurs under the condition of an increase in the volume of stable hydrocarbon condensate added to the studied model of mineralized formation water. Based on the results of CFD modeling, a device for breaking foam by stable hydrocarbon condensate has been worked out, the effectiveness of which will be confirmed experimentally and in field conditions. Practical implications The results of the performed laboratory studies and CFD modelling allow a more reasonable approach to using various available methods and measures to prevent the ingress of foam with a gas-liquid flow into the separation equipment of gas gathering and treatment systems. This approach makes it possible to develop new effective ways and measures to prevent this complication. Originality/value Based on CFD modelling, it was found that when a stable hydrocarbon condensate is supplied into a gas-liquid flow, foam breaks. A method for breaking foam in a gas-liquid flow has been developed, which is original and can be introduced in practice.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 114, 2; 67--80
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the modification by ultrafine silicon carbide powder on the structure and properties of the Al-Si alloy
Autorzy:
Kovbasiuk, T. M.
Selivorstov, V. Yu.
Dotsenko, Yu. V.
Duriagina, Z. A.
Kulyk, V. V.
Kasai, O. M.
Voitovych, V. V.
Powiązania:
https://bibliotekanauki.pl/articles/1818500.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
Al-Si alloy
silicon carbide
modification
mechanical properties
microstructure
microhardness
Stop Al-Si
węglik krzemu
modyfikacja
właściwości mechaniczne
mikrostruktura
mikrotwardość
Opis:
Purpose: Determine the possibility of modifying aluminium alloys of the Al-Si system with an ultrafine SiC modifier with a particie size of 3-5 pm. Design/methodology/approach: Processing of the Al-Si alloy was carried out by introducing an ultrafine modifier in the amount of 0.1, 0.2, or 0.3 wt.%. Silicon carbide (SiC) with a particle size in the range of 3-5 pm was used as a modifier. To study the microstructure of the formed surface layers, a metallographic analysis was performed according to the standard method on a microscope MIKPOTEX® MMT-14C using TopView software. Microhardness studies of the samples were carried out on a Vickers microhardness tester NOVOTEST TC-MKV1. The microstructure of castings of the AlSi12 grade was studied at magnification from 100 to 400 times on the horizontal and vertical surfaces of the samples after etching with a 2% NaOH aqueous solution. Findings: Aluminium cast alloy of Al-Si system has been synthesized with the addition of 0.1, 0.2, and 0.3 wt.% ultrafine SiC modifier. It was found that the modification of the AlSi12 alloy by SiC particles of 3-5 pm in size led to an improvement of its microstructure due to the reduction of the volume fraction of micropores and primary Si crystals. It was shown that the AlSi12 aluminium alloy due to the modification by 0.2 wt.% SiC has the best micromechanical properties and macrostructure density. Research limitations/implications: The obtained research results are relevant for cast specimens of the indicated sizes and shapes. The studies did not take into account the influence of the scale factor of the castings. Practical implications: The developed modification technology was recommended for use in the conditions of the foundry "Dnipropetrovsk Aggregate Plant" (Dnipro, Ukraine). Originality/value: The technology of AlSi12 alloy modification of ultrafine SIC modifier with a particle size of 3-5 pm was used for the first time.
Źródło:
Archives of Materials Science and Engineering; 2020, 101, 2; 57--62
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of gas gathering pipelines operation efficiency and selection of improvement methods
Autorzy:
Volovetskyi, V. B.
Doroshenko, Ya. V.
Kogut, G. M.
Dzhus, A. P.
Rybitskyi, I. V.
Doroshenko, J. I.
Shchyrba, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/2055762.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
gas
gas gathering pipeline
hydraulic efficiency
liquid contamination
foam
inner cavity cleaning
gaz
rurociąg
sprawność hydrauliczna
piana
Opis:
Purpose: The article implies theoretical and experimental studies of the liquid pollution accumulations impact on the efficiency of gathering gas pipelines operation at the Yuliivskyi oil and gas condensate production facility (OGCPF). Research of efficiency of gas pipelines cleaning by various methods. Design/methodology/approach: The research methodology consists of determining the hydraulic efficiency of gathering gas pipelines before and after cleaning of their internal cavity by different methods and comparing the obtained results, which allows to objectively evaluate the efficiency of any cleaning method. CFD simulation of gas-dynamic processes in low sections of gas pipelines with liquid contaminants. Findings: Experimental studies of cleaning efficiency in the inner cavity of the gas gathering pipelines of the Yuliivskyi OGCPF by various methods, including: supply of surfactant solution, creating a high-speed gas flow, use of foam pistons were performed. It was established that cleaning the inner cavity of gas gathering pipelines by supplying a surfactant solution leads to an increase in the coefficient of hydraulic efficiency by 2%-4.5%, creating a high-speed gas flow by 4%-7%, and under certain conditions by 8%-10 % and more. However, for two gas pipelines the use of foam pistons allowed to increase the coefficient of hydraulic efficiency from 5.7 % to 10.5 % with a multiplicity of foam from 50 to 90. be recommended for other deposits.The results of CFD simulation showed that the accumulation of liquid contaminants in the lowered sections of gas pipelines affects gas-dynamic processes and leads to pressure losses above the values provided by the technological regime. With the increase in liquid contaminants volume the pressure losses occur. Moreover, with a small amount of contamination (up to 0.006 m3), liquid contaminants do not have a significant effect on pressure loss. If the contaminants volume in the lowered section of the pipeline is greater than the specified value, the pressure loss increases by parabolic dependence. The increase in mass flow leads to an increase in the value of pressure loss at the site of liquid contamination. Moreover, the greater the mass flow, the greater the impact of its changes on the pressure loss. The CFD simulation performed made it possible not only to determine the patterns of pressure loss in places of liquid contaminants accumulation in the inner cavity of gas pipelines, but also to understand the gas-dynamic processes in such places, which is an unconditional advantage of this method over experimental. Research limitations/implications: The obtained simulation results showed that the increase in the volume of liquid contaminants in the inner cavity of gas gathering pipelines leads to an increase in pressure losses above the value provided by the technological regime. To achieve maximum cleaning of gas gathering pipelines, it is necessary to develop a new method that will combine the considered. Practical implications: The performed experimental results make it possible to take a more thorough approach to cleaning the inner cavity of gas gathering pipelines and to forecast in advance to what extent the hydraulic efficiency of gas gathering pipelines can be increased. Originality/value: The obtained results of CFD simulation of gas-dynamic processes in lowered sections of gas pipelines with liquid contaminants, experimental studies of the effectiveness of various methods of cleaning the inner cavity of gas gathering pipelines has original value.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2021, 107, 2; 59--74
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Large palaeophiid and nigerophiid snakes from Paleogene Trans-Saharan Seaway deposits of Mali
Autorzy:
Mccartney, J.A.
Roberts, E.M.
Tapanila, L.
O`leary, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/20719.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
The Paleogene was a time of high diversity for snakes, and was characterized by some of the largest species known to have existed. Among these snakes were pan-Tethyan marine species of Nigerophiidae and Palaeophiidae. The latter family included the largest sea snake, Palaeophis colossaeus, known from the Trans-Saharan Seaway of Mali during the Eocene. This paper describes new material collected from Malian Trans-Saharan Seaway deposits, including additional material of Palaeophis colossaeus, a new, large species of nigerophiid, Amananulam sanogoi gen. et sp. nov., and a medium-sized snake of indeterminate affinities. The material provides new information on the intracolumnar variation of the vertebral column in Palaeophis colossaeus. We estimate the total length of each species by regression of vertebral measurements on body size. Both Palaeophis colossaeus and Amananulam sanogoi gen. et sp. nov. are the largest or among the largest members of their respective clades. The large size of Tethyan snakes may be indicative of higher temperatures in the tropics than are present today.
Źródło:
Acta Palaeontologica Polonica; 2018, 63, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Framework of performance measurement practices within construction companies in Egypt
Autorzy:
Dziekoński, K.
Ibrahim, O. H. M. F.
Mahamadu, A.-M.
Manu, P.
Powiązania:
https://bibliotekanauki.pl/articles/125609.pdf
Data publikacji:
2018
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
performance
measurement system
construction
industry
Egypt
wydajność
system miar
budowa
przemysł
Egipt
Opis:
The construction industry is considered as one of the most important sectors in Egypt. One of the major challenges faced by the industry, however, is the unavailability of suitable performance measurement systems for assessing companies’ performance. Modern performance assessment systems adopt a more universal approach to the measurement of construction company performance as opposed to the traditional project triangle. This paper aims to examine the practice of performance measurement in the Egyptian construction industry. Results show dominant role of in-house developed performance management systems as well as the use of KPIs as a method of performance assessment. The study further reveals that the highest importance is given to measures related to the time of project delivery, quality of works, clients’ satisfaction and profitability. Hence, the traditional project triangle of project’s success is the most prevalent approach to performance evaluation in the construction industry in Egypt. However, a shift towards a more holistic approach to performance assessment in larger companies was observed.
Źródło:
Engineering Management in Production and Services; 2018, 10, 2; 7-14
2543-6597
2543-912X
Pojawia się w:
Engineering Management in Production and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Outcome of an educational training programme on blood glucose monitoring among nurses in the management of hypoglycaemia and hyperglycemia
Autorzy:
Onianwa, P.O.
Ayorinde, M.O.
Akanbi, F.O.M.
Are, O.O.
Nkom, A.T.
Akintola, G.O.
Gbenro-Ayodeji, A.
Sodipo, T.O.
Ojerinde, O.E.
Ojemola, O.E.
Powiązania:
https://bibliotekanauki.pl/articles/2098250.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
hyperglycemia
hypoglycemia
diabetes mellitus
blood glucose
monitoring
education programme
training programme
nurse
Opis:
Introduction. Diabetes mellitus is a chronic metabolic disorder that can lead to an increased length of hospital stay, delayed healing, and exacerbation of co-morbidities with complications arising if not properly managed. Better understanding and maintenance of normal blood glucose by nurses can positively influence care outcomes. The study aimed to assess nurses’ knowledge on the management of diabetes and skills in blood glucose monitoring. Materials and method. A structured pre- and post-questionnaire was used to assess nurses’ knowledge on the management of diabetes, and a structured checklist was used to assess their skills in blood glucose monitoring. Three hundred and thirty- eight (338) participants directly involved in the provision of care to diabetic patients were randomly selected for the study. Data were analyzed using descriptive and inferential statistics. Results. The study revealed that 58.9% of the respondents scored above the mean score of 33.1±3.5 during pre-assessment, which shows they had a good baseline knowledge of blood glucose. A post-intervention finding showed 64.8% scored above the mean score of 36.3±3.1. Assessment of nurses’ knowledge of blood glucose monitoring proficiency showed that 70.1% scored above the mean score of 11.4. Conclusions. The educational intervention programme with a practical training session was an effective method of approach for improving blood glucose management among the participants. However, it is recommended that protocols and practice guidelines should be placed at strategic locations, and methods of empowering nurses, such as providing them with equipment needed to sustain this practice, should be heightened.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2021, 15, 1; 20-25
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
(Eu,Gd)Te - MBE Growth and Characterization
Autorzy:
Dziawa, P.
Taliashvili, B.
Domuchowski, W.
Łusakowska, E.
Arciszewska, M.
Demchenko, I.
Dobrowolski, W.
Dybko, K.
Fedorych, O. M.
Nadolny, A. J.
Osinniy, V.
Petrouchyk, A.
Story, T.
Powiązania:
https://bibliotekanauki.pl/articles/2038228.pdf
Data publikacji:
2004-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
81.15.Hi
Opis:
Monocrystalline thin layers of (Eu,Gd)Te, n-type ferromagnetic semiconductor, were grown by molecular beam epitaxy technique on BaF$\text{}_{2}$ (111) substrates. Reflection high-energy electron diffraction, X-ray diffraction, and atomic force microscopy characterization proved epitaxial mode of growth and high crystal quality of the layers. Magnetic susceptibility and magnetic resonance measurements showed that in (Eu,Gd)Te layers ferromagnetic transition takes place at about 13 K. Electrical characterization carried out by the Hall effect and resistivity measurements revealed very high electron concentration of 10$\text{}^{20}$~cm$\text{}^{-3}$ and sharp maximum of resistivity at transition temperature.
Źródło:
Acta Physica Polonica A; 2004, 106, 2; 215-221
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First Mesozoic record of the stingray Myliobatis wurnoensis from Mali and a phylogenetic analysis of Myliobatidae incorporating dental characters
Autorzy:
Claeson, K.M.
O'Leary, M.A.
Roberts, E.M.
Sissoko, F.
Bouare, M.
Tapanila, L.
Goodwin, D.
Gottfried, M.D.
Powiązania:
https://bibliotekanauki.pl/articles/20545.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleontology
first record
Mesozoic
stingray
Myliobatis wurnoensis
Mali
phylogenetic analysis
Myliobatidae
dentition
Chondrichthyes
Myliobatiformes
batoid fish
fish
Cretaceous
Maastrichtian
Opis:
New specimens, including the first record of lower dental plates, of the extinct myliobatid Myliobatis wurnoensis were recovered from the Maastrichtian (Late Cretaceous) of the Iullemmeden Basin, Mali, and are the oldest record of the taxon. We evaluated the phylogenetic position of this taxon with reference to other myliobatids (extinct and extant) using osteology and dentition. Our results indicate that Myliobatinae and Myliobatis are each paraphyletic, and that Aetobatus and Rhinoptera are monophyletic. We also found that taxa known only from the Cretaceous, Brachyrhizodus and Igdabatis, are highly nested within Myliobatidae. The phylogenetic position of these taxa unambiguously extends the origin of Myliobatidae and most of its representative taxa into the Mesozoic.
Źródło:
Acta Palaeontologica Polonica; 2010, 55, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charcoal production: A promoter of deforestation in Nigeria
Autorzy:
Isese, M. O. O.
Powiązania:
https://bibliotekanauki.pl/articles/1076595.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Bombax buonopozense
Charcoal production
Deforestation
Ficus sur
Forest degradation
Khaya ivorensis
Tectona grandis
Tree plant
Vitellaria paradoxa
greenhouse gases
Opis:
Charcoal production in Nigeria is a growing source of concern for government and forestry institutions because of its perceived impact on the environment. The agreed impact is deforestation, i.e., the clearance of indiscriminate cutting of forest trees. Forest degradation associated with charcoal production is difficult to monitor and overlooked and under-represented in forest cover change and carbon emission estimates. Emissions of greenhouse gases a consequence of deforestation from charcoal production in tropical ecosystems in 2009 are estimated at 71.2 million t for carbon dioxide and 1.3 million t for methane. Trees used for charcoal production are Vitellaria paradoxa, Ficus sur, Tectona grandis, Khaya ivorensis, Bombax buonopozense just to mention a few. This review aims to further discredit the act of indiscriminate forest tree falling for charcoal production which have proofed by various works as a promoter of deforestation.
Źródło:
World News of Natural Sciences; 2019, 27; 1-10
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of radial electrical resistivity profile array for mapping deep vertical fractures in a proposed engineering construction site within the University of Ibadan Campus, Southwestern Nigeria
Autorzy:
Osinowo, O. O.
Falufosi, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/184580.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
radial profile array
vertical fracture
narrow azimuth survey
proposed construction site
Opis:
In this study we demonstrate the efficacy of radial electrical resistivity profile array in delineating deep narrow linear fracture that could constitute weakness in the subsurface, thus hindering foundation material in providing necessary support to proposed engineering construction, in the southeastern part of the University of Ibadan Campus, southwestern Nigeria, where nearby buildings show stress induced failure traceable to defect in foundation upon which the buildings were founded. Six electrical resistivity profile arrays were occupied at 0°/180°, 307210°, 607240°, 907270, 1207300° and 1507330° orientations to complete a clockwise 360° sweep at 30° interval. The radial profile array enabled subsurface features to be intersected at relatively high angle, thus making measurement of linear features of limited lateral extent feasible irrespective of their orientations. Low resistivity distribution which decreases in value with depth (300-8 Om) characterizes the northern part of the study area while relatively higher value that increases with depth (420-4150 Om) dominates the south. The occurrence of a narrow strip of low resistivity zone (8-170 Om) at 20 m, which gains prominence with depth, dividing relatively resistive zone in the southern part of the study area indicate the presence of a deep vertical fracture whose detection is essential to guide further foundation geotechnical studies as well as aid the design of appropriate foundation that would support the proposed engineering structure.
Źródło:
Geology, Geophysics and Environment; 2018, 44, 3; 329-338
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Вплив організаційної культури на інноваційний потенціал підприємства
Влияние организационной культуры на инновационный потенциал предприятия
The influence of organizational culture on the innovational potential of the company
Autorzy:
Kalnitskaya, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/692340.pdf
Data publikacji:
2015
Wydawca:
Dnieprowski Uniwersytet Narodowy im. Ołesia Honczara
Tematy:
організаційна культура
інноваційний потенціал
організація
вплив
цінності
філософія
підприємство
организационная культура
инновационный потенциал
организация
влияние
ценности
философия
предприятие
organizational culture
innovational potential
influence
organization
values
philosophy
enterprise
Opis:
Each organization as a socio-economic system is exposed to the factors of external and internal environment; the organizational culture (OC) of the company is in its turn the product of the interrelation between the external and internal environment of an enterprise, so any impact will determine further formation and development of OC. The factors of both external and internal environment can have a positive or negative trend to a change. The problems of the research into the essence of OC and the innovation potential are tackled in many papers of both domestic and foreign authors, but no relationship was identified between the structure and the factors of OC and innovation potential. Therefore, in our opinion, the issue of identifying the factors influence presents a problem. Its defining will make it possible to forecast a positive or a negative trend in the change of the organizational structure that will determine the capacity to enhance the innovation potential of an enterprise. The purpose of writing this article was to study the influence of factors of external and internal environment of the organization on the components of OC and the innovation potential of an enterprise. To explore the problems studied for the article we structured in detail the concepts and elements that OC contains, and also defined the structure of the innovation potential, its components. Comparison of the structures of OC and innovation potential demonstrated the presence of common and interrelated elements. A deeper analysis was conducted by defining the main factors of OC. The results of the analysis allowed determining the place of OC in the structure of the innovation potential of an enterprise. Thus, the following conclusions can be made. First, the structure of OC and the innovation potential contains a shared item, which is microclimate that implies conditions that can facilitate the development of innovation in the organization. Second, the factors of OC for the most part form the structure of the innovation potential: personality of the founder – management style, system of communication; the size of the organization determines its structure, the presence of various technological premises, the possibility of free movement of the personnel and organization of work. Third, production technology, adopted by the organization, determines the level of its innovation potential. The flexibility of OC allows more intensive using and adapting innovation technologies at an enterprise. The scientific novelty of the research. For the first time we formulated a definition of OC as a model of key elements, genuinely correct and the one that is passed on to the new members of the team as a certain dogma. The practical value of the work lies in summarizing and comparing the basic elements of OC and the innovation potential and identifying common peculiarities that makes it possible to define the role of formation and development of organizational culture in improving the innovation of an enterprise.  Further objectives are defined as the analysis of influence factors on the Ukrainian enterprises, identification of problems and development of plans to eliminate them or warn about them.
Раскрыты фундаментальные факторы и явления, которые непосредственно влияют на организационную культуру предприятия, предоставлена их развернутая характеристика. В рамках проблематики отдельно описаны различные группы факторов: первичные и вторичные, внешней и внутренней среды. На основе проведенного анализа определено влияние каждого фактора на эффективность функционирования организационной культуры на предприятии. Определена структура инновационного потенциала и выявлено место организационной культуры в нем
Кожна організація як соціально-економічна система зазнає впливу факторів зовнішнього та внутрішнього середовища, у свою чергу, організаційна культура (ОК) підприємства – продукт взаємозв’язку зовнішнього та внутрішнього середовища підприємства, отже, будь-який їх вплив визначатиме подальше становлення і розвиток ОК. Чинники як зовнішнього, так і внутрішнього середовища можуть мати позитивні або негативні тенденції до зміни. Проблемам дослідження сутності ОК та інноваційного потенціалу присвячено багато робіт як вітчизняних авторів, так і закордонних, але не виявлено взаємозв’язку структури й факторів ОК та інноваційного потенціалу. Отже, на нашу думку, питання виявлення впливу факторів проблемне. Його визначення дозволить спрогнозувати позитивну або негативну тенденцію зміни організаційної структури, що в результаті визначить можливість підвищення інноваційного потенціалу підприємства. Мета написання статті полягала у вивченні впливу факторів зовнішнього та внутрішнього середовища організації на складники ОК й інноваційний потенціал підприємства. Для розкриття проблематики статті було детально структуровано поняття та визначено елементи, які містить ОК, а також визначено структуру інноваційного потенціалу, його складники. Порівняння структур ОК та інноваційного потенціалу засвідчило наявність спільних і взаємозалежних елементів. Глибший аналіз було проведено за допомогою визначення головних факторів ОК. Результати аналізу дозволили визначити місце ОК у структурі інноваційного потенціалу підприємства. Отже, можна зробити такі висновки. По-перше, структура ОК та інноваційного потенціалу містить спільний елемент – мікроклімат, який передбачає створення умов, що можуть сприяти розвитку інноваційності організації. По-друге, фактори ОК здебільшого формують структуру інноваційного потенціалу: особистість засновника – стиль управління, систему комунікацій; розмір організації визначає її структуру, наявність різних технологічних приміщень, можливість вільного переміщення персоналу та організацію праці. По-третє, технологія виробництва, прийнята в організації, визначає рівень її інноваційного потенціалу. Гнучкість ОК дозволяє інтенсивніше застосовувати й адаптувати на підприємстві інноваційні технології. Наукова новизна дослідження. Вперше сформульовано визначення ОК як моделі ключових елементів, істинно правильної і такої, яку передають новим членам колективу як певну догму. Практичне значення роботи полягає в узагальненні та порівнянні базових елементів ОК й інноваційного потенціалу і виявленні спільних рис, що дає можливість визначити роль формування та розвитку організаційної культури в підвищенні інноваційності підприємства. Подальшими завданнями визначимо аналіз впливу факторів на українські підприємства, виявлення проблем і розробку планів щодо їх усунення або попередження. 
Źródło:
European Journal of Management Issues; 2015, 5; 60-70
2519-8564
Pojawia się w:
European Journal of Management Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sulphate reduction - methane oxidation: a potential role of this process in the origin of C isotope environmental record in freshwater carbonates
Autorzy:
Jędrysek, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/1186076.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
woda słodka
węgiel
tlen
siarka
metan
węglany
siarczany
izotopy
antropopresja
fresh water
carbon
oxygen
sulphur
methane
carbonates
sulphates
isotopes
anthropogenic impact
Opis:
W pracy wykazano, że węglany jeziorne powstałe w wyniku mikrobiologicznego utleniania związków organicznych (w tym metanu), przy redukcji jonów siarczanowych, mogą stanowić ważny geochemiczny zapis zmian środowiskowych. Najprawdopodobniej niskie wartości 13C w kalcycie, w rzekach i jeziorach eutroficznych wynikają z silnego utleniania związków organicznych w warunkach turbulencji i/lub podwyższonych stężeń siarczanu. Podobnie, wysokie wartości 13C w kalcycie, zawartym w osadach słodkowodnych bogatych w materię organiczną, mogą wskazywać na niski potencjał redox. Na podstawie tego typu badania wydaje się możliwe wykalibrowanie nowego narzędzia do rekonstrukcji palaeośrodowiskowych. Z drugiej strony, utlenianie metanu (związków organicznych) może powodować wzbogacenie rezydualnego jonu siarczanowego w ciężkie izotopy tlenu i siarki. Dlatego, aby lepiej zrozumieć sygnał izotopowy w węglanach jeziornych, wykonano badania stężenia i badania izotopowe siarczanu kolumny wodnej oraz badania metanu i kalcytu w osadach 24 jezior, 2 stawów i 4 rzek w Polsce. Rozpuszczony jon siarczanowy jest jednym z głównych składników rozpuszczonych w wodach jeziornych, a siarka, jako istotny biopierwiastek, wpływa na procesy zachodzące w jeziorach, w tym na jakość wód (mikrobiologiczny rozkład związków organicznych, inhibitor metanogenezy). Najwyższe stężenie jonu siarczanowego stwierdzono w rzekach (85,47 ncentration of sulphate has been detected in rivers (85.47 SO42- mg/l) i sztucznym jeziorze (70,3 SO42 -42- mg/l) w regionie silnego zanieczyszczenia (tzw. "Czarny Trójkąt") w Polsce południowo-zachodniej. Najniższe stężenie siarczanu stwierdzono w jeziorach dystroficznych i oligotroficznych - górskich (od 0,5 do 3 mg/l SOSO42 -). Najniższe wartości δ34S(SO42-) i δ18O(SO42-) występują w niezanieczyszczonych jeziorach wschodniej Polski (-0,94 i 1,38‰). Najwyższe wartości δ34S(SO42-) i δ18O(SO42-) stwierdzono w Polsce zachodniej i jeziorach dystroficznych (12,95 i 16,15‰). Wykazano, że. δ34S(SO42- i δ18O(SO42-) jezior mogą być dobrym narzędziem do ilościowej charakterystyki antropopresji (kwaśne opady) oraz do monitorowania zmian trofii i procesów redoks związanych z biodegradacją związków organicznych w osadach i kolumnie wodnej. W przeciwieństwie do czystych jezior, jeziora silnie zanieczyszczone jonem siarczanowym wykazują wzrost wartościδ13C(CH4) wraz ze wzrostem głębokości kolumny wodnej. Może to być wskaźnikiem utraty przez jezioro mikrobiologicznej zdolności buforującej.
Źródło:
Polish Geological Institute Special Papers; 2005, 16; 18--34
1507-9791
Pojawia się w:
Polish Geological Institute Special Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On quasi-similarity and w-hyponormal operators
Autorzy:
Otieno, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/255574.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
w-hyponormal operators
quasi-similarity
Opis:
In this paper, it is shown that a Putnam-Fuglede type commutativity theorem holds for w-hyponormal operators, the normal parts of quasi-similar w-hyponormal operators are unitarily equivalent and a w-hyponormal spectral operator is normal.
Źródło:
Opuscula Mathematica; 2007, 27, 1; 73-81
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of welding parameters on decarburization in heat affected zone of dissimilar weldments after post weld heat treatment
Autorzy:
Nimko, M.O.
Powiązania:
https://bibliotekanauki.pl/articles/2175744.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
welding
dissimilar welds
carbon diffusion
grain boundaries
spawanie
niepodobne spoiny
dyfuzja węgla
granice ziaren
Opis:
Purpose: This paper aims to assess an influence of thermal welding parameters on microstructural evolution in the weld adjacent zone of P91 steel, overlayed by austenitic consumables, after post weld heat treatment. Design/methodology/approach: Analysis of the width of decarburized layer on microphotographs of overlayed specimens after tempering 750°C, 7 and 18 hours. Specimens were made by using different heat input and preheating temperature parameters. Findings: It is shown that with increase of the heat input energy, the width of the resulting decarbonized layer decreases linearly; the effect of heating temperature on the layer width is parabolic with a minimum at a temperature of ~195°C. Research limitations/implications: Future research may include comparison of the creep rupture strength of the weldments, made with different welding parameters, to assess the influence of kinetics of decarburization and variation of the parameters on creep rupture strength. Practical implications: Results permit to achieve minimization of rate of carbon diffusion in the weld adjacent zone of the HAZ by means of variation of welded parameters. Originality/value: Experimentally was confirmed a role of high-diffusivity paths (grain boundaries) on carbon diffusion in the HAZ of dissimilar weldments; found correlation between welding parameters and the rate of the diffusion during high temperature exposure.
Źródło:
Archives of Materials Science and Engineering; 2021, 112, 1; 23--31
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Effects of Parameters in Element-Free Galerkin Method for Bending Analysis of Mindlin-Reissner Plates
Autorzy:
Bozkurt, Ö.
Barbar, M.
Özbek, Ö.
Powiązania:
https://bibliotekanauki.pl/articles/1401977.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
45.10.-b
Opis:
The element-free Galerkin method is one of the most widely used meshfree method in solid mechanics due to its simplicity and high convergence rate. However, it has some selectable parameters that affect the accuracy and convergence. The parameters can be listed as size of support domain, number of monomials, type of weight function, number of integration points in a background cell and value of penalty coefficient. The effects of these parameters on the accuracy of the element-free Galerkin method solution of the Reissner-Mindlin plate bending are investigated. A number of case studies with regular and irregular node distributions are solved. The displacement and moment values at critical points are compared with exact solutions. It is shown that the selectable parameters have to be carefully selected especially for the analysis of moments.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-208-B-210
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intercrop advantages of some improved sweet potato + soybean in Makurdi, Benue State, Nigeria
Autorzy:
Egbe, M.O.
Osang, P.O.
Powiązania:
https://bibliotekanauki.pl/articles/11880.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
Field trials were conducted during 2011 and 2012 cropping seasons at the Teaching and Research Farm of the University of Agriculture Makurdi, Benue State located in Southern Guinea Savanna of Nigeria. The objective of the study was to evaluate the response of some improved sweet potato varieties planted at three densities to intercropping with soybean. The experiment was a 2x3x3 split-split plot laid out in a randomized complete block design with three replications. The main plot consisted of two cropping systems [sole cropping (sweet potato, soybean) and intercropping (sweet potato + soybean). The sub-plot consisted of three sweet potato varieties (CIP440037, NRSP/05/007C and CIP440141). The sub-sub-plot treatment comprised of three sweet potato planting densities (25,000 plants/ha, 33,000 plants/ha and 50,000 plants/ha). Intercropping severely depressed the yields of both sweet potato varieties and the soybean component, such that intercrop yields were rarely above 50% of sole crop yields, irrespective of the sweet potato variety used. The number and weight of the sweet potato component was not significantly affected at the planting density of 50,000 plants/ha. Indices used to measure intercrop advantage showed that intercropping these sweet potato varieties with soybean was biologically efficient and percentage land saved varied from 23.08 and 32.43. Soybean was more competitive than sweet potato at all densities tested.
Źródło:
International Letters of Natural Sciences; 2015, 39
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Depth of the water column in relation to carbon isotope ratios in methane in fresh water sediments
Autorzy:
Jędrysek, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/2058951.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
stable carbon isotopes
methane
fresh water sediments
diagenesis
environmental record
Opis:
Methane was collected from the surficial sedimentary layer (0 to about 20 cm) in 45 fresh water lakes in Poland. Sampling was also carried out at various depths of the over lying water column (0.15 to 12 m) between noon and early after noon, on a seasonal basis, between 1992 and 1996. A positive correlation between the depth of the lake water, the δ13 C (CH4) value (from ca. -l.4 to -2.3% per l m depth) and the wider δ13 C (CH4) variation over the thermocline are probably due to: the time of sinking of organic particles resulting in more in tense acetate fermentation in shallower portions of the lake; the temperature variation; differences in the precursors of methane, the diffusion effect, and an increase of bioavailable DIC (dissolved inorganic carbon) at greater depths. Non-seasonal variation of isotope ratios in methane and the depth-isotope ratio correlation show that the lake system is in dynamic equilibrium on a scale of hours and days. Therefore, earlier models of methanogenesis relating and the atmospheric methane isotopic budget, proposed by other authors and based on sampling of methane from sediments, need to be revised. More over, δ13 C (CH4) values higher during seasonal over turn (mixing of benthic and surface waters) than during stagnation, have been observed. This is probably due to the fact that during over turn periods some organic compounds (methane precursors) and methane in the surficial part of sediments, are oxidized with a resalting kinetic isotope effect. It is proposed that oxidation of methane and other organic compounds during seasonal over turn may be responsible for post-depositional lamination observed as pale (autumn over turn) and dark (summer organic-rich unoxic stagnation) millimetres-thick layers in fresh water lake sediments.
Źródło:
Geological Quarterly; 2005, 49, 2; 151-164
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-100 z 1613

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