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Tytuł:
Інноваційно-інституційні інструменти несумлінної конкуренції у глобальному середовищі
Innovation and institutional instruments unconscientious competition in the global environment
Autorzy:
Fleychuk, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/692492.pdf
Data publikacji:
2012
Wydawca:
Dnieprowski Uniwersytet Narodowy im. Ołesia Honczara
Tematy:
метатехнології
«високі гуманітарні технології»
конкурентоспроможність економіки
стратегії «трансплантації» інститутів
metatehnologies
«high-hume» technologies
economy competitiveness
the strategy of institutions «transplantation»
Opis:
The problems of «high-hume» technology using in the global environment areconsidered. The methods of institutions «transplantation» within international quasi-legal strategies for new markets expansion are analyzed
Розглядаються проблеми застосування метатехнологій у глобальному середовищі. Проаналізовано методи «трансплантації» інститутів у межах міжнародних напівлегальних стратегій завоювання нових ринків збуту.
Źródło:
European Journal of Management Issues; 2012, 1; 39-48
2519-8564
Pojawia się w:
European Journal of Management Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On an estimate for the norm of a function of a quasihermitian operator
Autorzy:
Gil, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/1293113.pdf
Data publikacji:
1992
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
functions of linear operators
estimation of norms
Opis:
Let A be a closed linear operator acting in a separable Hilbert space. Denote by co(A) the closed convex hull of the spectrum of A. An estimate for the norm of f(A) is obtained under the following conditions: f is a holomorphic function in a neighbourhood of co(A), and for some integer p the operator $A^p - (A*)^p$ is Hilbert-Schmidt. The estimate improves one by I. Gelfand and G. Shilov.
Źródło:
Studia Mathematica; 1992, 103, 1; 17-24
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of grape plantations on morphogenetic diagnostic indicators of arid subtropical soils
Wpływ plantacji winorośli na wskaźniki morfogeniczne gleb subtropikalnych
Autorzy:
Mammadov, M. İ.
Powiązania:
https://bibliotekanauki.pl/articles/293172.pdf
Data publikacji:
2015
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
diagnostic index
fertility
grape plants
morphogenetic properties
soil morphology
morfologia gleb
urodzajność
winorośl
właściwości morfogeniczne
wskaźnik diagnostyczny
Opis:
Results of the study showed that cultivation of the grey-brown (chestnut) and mountain brown soils under the grape plantation changes their morphogenetic and morphological characteristics in arid subtropical climatic condition. Performed cultivation caused migration of humus into the deeper soil layers. The denser horizon formed under a soft layer. This results in a change of the soil chemical structure and water-physical properties. These changes manifested themselves under irrigative condition.
Badania wykazały, że w warunkach klimatu subtropikalnego w wyniku zabiegów agrotechnicznych podczas uprawy winorośli na glebach szarobrunatnych oraz brązowych górskich zmieniają się właściwości morfogeniczne i morfologiczne tych gleb. Prowadzone prace kultywacyjne powodują, że związki humusowe przemieszczają się w głąb profilu glebowego. Poniżej warstwy luźnej powstaje wówczas bardziej zbita warstwa. W wyniku tego zmieniają się wodno- fizyczne właściwości gleb i ich struktura chemiczna. Zmiany te są szczególnie widoczne, gdy plantacje są nawadniane.
Źródło:
Journal of Water and Land Development; 2015, 25; 37-40
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal control problems with a fixed terminal time in linear fractional-order systems
Autorzy:
Gomoyunov, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/1403685.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optimal control
fractional derivatives
linear systems
open-loop control
feedback control
reduction
Opis:
The paper deals with an optimal control problem in a dynamical system described by a linear differential equation with the Caputo fractional derivative. The goal of control is to minimize a Bolza-type cost functional, which consists of two terms: the first one evaluates the state of the system at a fixed terminal time, and the second one is an integral evaluation of the control on the whole time interval. In order to solve this problem, we propose to reduce it to some auxiliary optimal control problem in a dynamical system described by a first-order ordinary differential equation. The reduction is based on the representation formula for solutions to linear fractional differential equations and is performed by some linear transformation, which is called the informational image of a position of the original system and can be treated as a special prediction of a motion of this system at the terminal time. A connection between the original and auxiliary problems is established for both open-loop and feedback (closed-loop) controls. The results obtained in the paper are illustrated by examples.
Źródło:
Archives of Control Sciences; 2020, 30, 4; 721-744
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Korelacja i geneza piaskowców karbońskich w świetle stratygrafii sekwencyjnej i ich potencjał węglowodorowy w północno-zachodniej i centralnej części basenu lubelskiego
Correlation and origin of the carboniferous sandstones in the light of sequence stratigraphy and their hydrocarbon potential in the NW and central parts of the Lublin Basin
Autorzy:
Waksmundzka, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/2063258.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
analiza litofacjalna
stratygrafia sekwencji
węglowodory
basen lubelski
karbon
lithofacial analysis
sequence stratigraphy
hydrocarbons
Lublin Basin
Carboniferous
Opis:
Na podstawie badań sedymentologicznych utworów karbonu basenu lubelskiego scharakteryzowano środowiska depozycji piaskowców, mułowców, iłowców, skał węglanowych i węgla. Regionalna korelacja pozwoliła na wydzielenie 22 sekwencji depozycyjnych (trzeciego rzędu), ograniczonych niezgodnościami identyfikowalnymi jako powierzchnie erozyjne, stanowiące spągi koryt rzecznych lub wciętych dolin. W obrębie każdej sekwencji wyróżniono utwory ciągów systemowych niskiego stanu WPM (względnego poziomu morza), transgresywnych oraz ciągów systemowych wysokiego stanu. Następnie przeprowadzono korelację wydzieleń stratygrafii sekwencj i z chronostratygraficznym podziałem karbonu. Podnoszenie się WPM, stanowiącego bazę erozyjną rzek w czasie niskiego stanu, było podstawowym czynnikiem wpływającym na wykształcenie facjalne i miąższość potencjalnie złożowych piaskowców rzecznych. Utwory te najczęściej występują w systemach wciętych dolin. W obrębie sekwencji 2,4-10,16 spotykane są średnie i duże systemy prostych wciętych dolin, natomiast w sekwencjach 11-15 duże systemy złożone. W profilu sekwencji 17-22 piaskowce związane są ze środowiskiem nie wciętych systemów koryt rzecznych. Podnoszenie WPM w czasie późnego niskiego stanu, jego wahania w czasie transgresji i wysokiego stanu oraz wzmożona dostawa osadów lub jej brak były podstawowymi czynnikami mającymi wpływ na wykształcenie facjalne, miąższość i lateralne rozprzestrzenienie iłowców i mułowców równi aluwialnych, estuariowych, deltowych i płytkoszelfowych, które są dobrymi horyzontami uszczelniającymi. Piaskowce sekwencji 6, 9, 12, 16, wypełniające średnie lub duże wcięte doliny, oraz sekwencji 17, powstałe w systemach nie wciętych koryt rzecznych, są predysponowane do akumulacji węglowodorów. Wynika to z ich izolowanego usytuowania w obrębie stosunkowo bogatych w rozproszoną materię organiczną iłowców i mułowców, będących jednocześnie horyzontami uszczelniającymi. Porównanie schematu sekwencji z używanymi dotychczas do korelacji granicami jednostek litostraty graficznych karbonu basenu lubelskiego, jak również z kompleksami geofizycznymi podważa ich izochroniczną interpretację i zmniejsza przydatność korelacyjną.
Sedimentological investigations of Carboniferous deposits from the Lublin Basin enabled characterisation of the depositional environment of sandstones, mudstones, claystones, carbonates and coals. A regional correlation allowed identification of 22 depositional sequences (third-order) are separated by unconformities, preserved as erosional bottoms of fluvial channels or incised valleys. Each sequences are represented by lowstand, transgressive and highstand systems tracts. Subsequently, a correlation of the sequence stratigraphy division with the Carboniferous chronostratigraphic scheme was carried out. The rise of relative sea level, being an erosional base to rivers during the low sea-level stand, was the fundamental factor affecting the facies development and thicknesses of the potentially productive fluvial sandstones. These deposits most frequently occur in incised valley systems. Medium and large sized systems of simple incised valleys are observed in the sequences 2, 4-10 and 16. Large compound systems are known from the sequences 11-15. The sandstones observed in the sequences 17-22 are associated with non-incised systems of river channels. The rise of relative sea level during the lowstand period, its fluctuations during the transgression and highstand periods, and an increased supply of sediments or its lack were the basic factors that influenced the facies development, thickness and lateral extent of alluvial plain, estuarine, deltaic and shallow shelf claystones and mudstones acting as good sealing horizons. The sandstones of the sequences 6,9,12 and 16 (filling medium and large incised valleys) and the sequence 17 (developed in systems of non-incised river channels) are predisposed to be reservoir rocks for hydrocarbon accumulations. It is due to their position as isolated bodies within the sealing claystones and mudstones relatively rich in dispersed organic matter. A comparison of the sequence scheme both with the previously used boundaries of the Carboniferous lithostratigraphic units in the Lublin Basin and with geophysical complexes questions their isochroneity and reduces their usefulness for correlations.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2008, 429; 215-223
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-order variations and small-time local attainability
Autorzy:
Krastanov, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/970758.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
small-time local attainability of a set
high-order control variations
Opis:
We study the problem of small-time local attainability (STLA) of a closed set. For doing this, we introduce a new concept of variations of the reachable set, well adapted to a given closed set and prove a new attainability result.
Źródło:
Control and Cybernetics; 2009, 38, 4B; 1411-1427
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inverse problems in underwater acoustics
Autorzy:
Taroudakis, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/332324.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The paper presents an aver view of the inverse problems associated with applications of underwater acoustics. The problems are classified into four main categories, according to the recoverable quantities: Acoustic source localization, bottom identification; ocean acoustic tomography and target recognition: The paper gives emphasis to the three first categories, and includes methods to solve the inverse problems associated with the appropriate experimental configurations.
Źródło:
Hydroacoustics; 1999, 2; 281-290
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Total subspaces in dual Banach spaces which are not norming over any infinite-dimensional subspace
Autorzy:
Ostrovskiĭ, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/1292779.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
The main result: the dual of separable Banach space X contains a total subspace which is not norming over any infinite-dimensional subspace of X if and only if X has a nonquasireflexive quotient space with a strictly singular quotient mapping.
Źródło:
Studia Mathematica; 1993, 105, 1; 37-49
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptacyjne układy sterowania tworzące strefy ciszy wokół poruszającego się mikrofonu
Adaptive control systems creating zones of quiet around moving error microphone
Autorzy:
Michalczyk, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/156587.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
aktywna redukcja hałasu
adaptacyjne układy sterowania
algorytm LMS
active noise control
adaptive algorithms
LMS algorithm
parameterization
Opis:
Przedstawiono wyniki badań nad adaptacyjnymi układami aktywnej redukcji hałasu wykorzystywanymi do tworzenia stref ciszy wokół poruszającego się w pomieszczeniu mikrofonu. Pokazano, że w części przypadków zastosowanie adaptacyjnego algorytmu FX-LMS zapewnia poprawne działanie układu, czyli śledzenie przez wytworzoną strefę ciszy zmian położenia mikrofonu. W przypadku złożonych zakłóceń lub szerszego zakresu ruchu mikrofonu, koniecznym jest zastosowanie dodatkowych algorytmów bieżącej estymacji modelu obiektu sterowania.
The paper summarizes the novel research on a special class of digital sound processing systems with time varying sound sensor position, conducted in the Institute of Automatic Control, Silesian University of Technology, Gliwice, Poland. These are adaptive active noise control (ANC) systems creating zones of quiet around a microphone, position of which is being changed in enclosure. They use the LMS-based adaptive control algorithm which is parameterized with a model of the so called secondary path. The problem arises when the microphone position is changed during the ANC system operation, because the secondary path modelling errors occur . They, in some cases, can be coped by the adaptive control algorithm itself, however, in other cases an additional, on-line identification routine has to be used to update the secondary path model. These two situations are the subject of the presented research. The results of real world experiments showed that the zone of quiet can adaptively track the movement of the microphone if the LMS-based adaptive control algorithm is applied. However, if the noise is random and the spatial range of the microphone movement is wider, then the more complex algorithms have to be used, which is shown on the basis of simulation experiments, verified in the ANC laboratory.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 1, 1; 9-11
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Career barriers to career indecision : a final-year BBA students view
Od barier kariery do niezdecydowania co do kariery : przykład studentów ostatniego roku lincencjatu z zarządzania
Autorzy:
Ukil, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/405299.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska
Tematy:
career
career barriers
career difficulty
career indecision
kariera
bariery kariery
trudności związane z karierą
niezdecydowanie co do kariery
Opis:
Researchers uncovered number of factors that affect young students in finding their preferred career, and that lead to career indecision. This study thus drives into two directions: first to identify the major barriers that stimulate difficulty for students to explore right career, and second to ascertain what occupational barriers lead to career indecision. The sample of this research involved final-year BBA (Bachelor of Business Administration) students studying at ten different universities in Bangladesh. A survey was steered using self-reported questionnaire consisting of two standardized measures to gather research data. Surveyed data were reviewed first to ensure usability and then analysed following a number of distinct statistical techniques including descriptive, Pearson correlation and regression analysis. All the statistical analyses were performed in SPSS software version 20.00. Results reveal that political and social reference, national shortage of good job, lack of parental interest, lack of career counseling and lack of personal ability significantly affect students’ career, that in consequence lead to career indecision. The present research suggests that various policy-makers, management and university may support students by ensuring merit-based recruitment, generating prospects through new ventures, organising career programs and developing their aptitudes.
Naukowcy odkryli wiele czynników, które wpływają na młodych studentów podczas poszukiwania preferowanej kariery, a które prowadzą do niezdecydowania co do kariery. Badanie to prowadzi w dwóch kierunkach: po pierwsze, aby zidentyfikować główne przeszkody, które stymulują trudności dla uczniów co do odkrywania właściwej kariery, a po drugie, aby ustalić, jakie bariery zawodowe prowadzą do niezdecydowania co do kariery. Próbka badania obejmowała ostatni rok licencjatu z zarządzania, studentów studiujących na dziesięciu różnych uniwersytetach w Bangladeszu. Badanie polegało na samodzielnym wypełnianiu kwestionariusza przez respondentów, składającego się z dwóch standardowych środków do zbierania danych badawczych. Badane dane zostały zweryfikowane najpierw aby zapewnić użyteczność, a następnie przeanalizowano je przy wykorzystaniu różnych technik statystycznych, uwzględniając opisową korelację Pearsona oraz analizę regresji. Wszystkie analizy statystyczne przeprowadzono w wersji oprogramowania SPSS 20.00. Wyniki pokazują, że odniesienia polityczne i społeczne, brak dobrej pracy w kraju, brak zainteresowania rodzicielskiego, brak doradztwa zawodowego i brak osobistej zdolności znacząco wpływają na kariery studentów, które w konsekwencji prowadzą do niezdecydowania co do kariery. Przeprowadzone badania sugerują, że różni decydenci, zarządzanie i uczelnia mogą wspierać uczniów poprzez zapewnienie rekrutacji opartej na osiągnięciach, generując perspektywy poprzez nowe przedsięwzięcia, organizowanie programów kariery i rozwijanie swoich uzdolnień.
Źródło:
Polish Journal of Management Studies; 2016, 13, 1; 192-205
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The properties of formation of the trematode fauna in molluscs in water reservoirs of the river Dniepr cascades
Wpływ właściwości kształtowania się fauny płazińców u ślimaków w zbiornikach wodnych kaskady rzeki Dniepr
Vlijanie svojjstv obrazovanija fauny ploskikh chervejj i ulitok v vodnykh bassejjnakh kaskady reki Dnepr
Autorzy:
Cernogorenko, M.I.
Powiązania:
https://bibliotekanauki.pl/articles/2165055.pdf
Data publikacji:
1976
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1976, 22, 4-5; 455-456
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eco Tourism as a Way for Biodiversity Conservation: A Study Based on Trincomalee District in Sri Lanka
Autorzy:
Kaleel, M. I. M.
Powiązania:
https://bibliotekanauki.pl/articles/1114011.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
biodiversity
conservation
ecotourism
environment
nature
Opis:
Conserving biodiversity is a major necessity, as human interference causes loss of this. Tourism is not exempt from this. Still, ecotourism, a sub-component of the field of sustainable tourism, has more positive effects. The primary objective of this work is to ascertain the condition of ecotourism in the study area. The secondary objectives are to identify the challenges and progress of biodiversity by way of ecotourist activity, and to suggest solutions to promote best outcome and to overcome the challenges of ecotourism. China Bay (Marble Beach), Kanniya Hot Wells, Nilaveli Beach, Pullmottai Beach (Arisimalai), Lanka Patina and Trincomalee Beach are renown places for tourism in Trincomalee District. The condition of the ecotourism industry in Trincomalee District was identified by means of questionnaire survey and direct observation. Our work shows that the coastal areas are particularly rich in biodiversity and in offering scenic values. Many environmental challenges were identified and remedial measures, suggested.
Źródło:
World News of Natural Sciences; 2017, 12; 82-91
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact on Wetlands: A Study Based on Selected Areas in Ampara District of Sri Lanka
Autorzy:
Kaleel, M. I. M.
Powiązania:
https://bibliotekanauki.pl/articles/1118877.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Municipality
Settlement
and brackish
wetlands
Opis:
Wetlands are normally deemed areas where water covers soil all or part of the time. Wetlands are important because they protect and improve water quality, provide fish and wildlife habitats, store floodwaters and maintain surface water flow during dry periods. According to the Ramsar convention, wetlands are defined as "Areas of marsh, fen, peat land or water, whether natural or artificial, permanent or temporary with water that is static or flowing, fresh, brackish or salt, including areas of marine water the depth of which at low tide does not exceed six meters." (Ramsar convention, 1971). In Ampara District of Eastern Province, Kalmunai Municipality, the Karaitivu and Nintavur areas have some significant quantities of wetlands. However, increased population, construction works, town expansion and negligence have generated considerable damage to these. Thus, this research was conducted to identify the negative human impact on these wetlands. In so-doing, the following objectives were met: ‘to find the challenges to wetland existence to note changes in the study area, to find the factors for the wetland deterioration and to suggest solutions to wetland conservation’. Primary and secondary data were used for this study. As primary data, questionnaire survey and direct observation were used. As secondary data, books, magazines, previous researches and statistics were used. The collected data were analyzed using SPSS and GIS software and suggest the practice of remedial measures such as creating proper waste management systems and enhancing the awareness of the value of the wetlands.
Źródło:
World News of Natural Sciences; 2017, 7; 16-25
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pipe-borne water consumption and its wastage: A study based on Panandura Urban Area in Sri Lanka
Autorzy:
Kaleel, M. I. M.
Powiązania:
https://bibliotekanauki.pl/articles/1182765.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
water consumption
water saving and management
water wastage
Opis:
Water is a lifeblood aspect of human being and without water, human being is impossible in the world. From time to time, people have consumed water from many sources and the ancient civilizations also emerged from river banks to meet the need of water. In this modern industrial world, technological advancements have enabled the pipe-borne water supply in widespread manner and it is not except to Sri Lanka too. Excessive consumption of water leads to water resource scarcity and hinders the even water supply to the people. In general context, water wastage is seen as ‘the consumption of excessive water for the routing needs’. In Sri Lanka, the provision of water for drinking and irrigation on a sustainable basis is a national priority (Central bank of Sri Lanka, 2005). Despite, the pipe-borne water supply is considered as a method to supply water for people who are not access to the water, it has many contemporary impacts on water quantity’s change and consumption pattern. Thus, this study was conducted to find the pipe-borne water consuption and its wastages in Panandura urban area. The objectives of this study are ‘to evaluate the change of the quantity of pipe-borne water consumption, to find the factors for the water wastage and finding the mechanisms to reduce the water wastage and propose the proper water management plans’. This study was conducted using the primary and secondary data. As primary data, discussion, questionnaires were used and as secondary data, reports from national water supply and drainage board, Divisional Secretariat reports, books, research papers, newspaper, magazines, websites, qualitative and quantitative tools were used. Based on the analysis and using the collected data, objectives were attained as population growth, rise in income level, modern machinery utilization, urbanization are the reasons for the change of pipe-borne water consumption. And also, the main factors for the water wastages are the pattern of the water consumption of residents, water leaks and dearth of awareness among residents. To reduce the over consumption and wastage, frequently check the water leaks in households, recycle the used water, to follow the rain water harvesting methods and to conduct the awareness programmes among people regarding the water saving and wastage, were suggested as recommendations and importance of water saving and managemet also stressed in this study considering our posterity.
Źródło:
World Scientific News; 2017, 66; 250-262
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Land degradation analysis on Coastal Area of Ampara District
Autorzy:
Kaleel, M.I.M.
Powiązania:
https://bibliotekanauki.pl/articles/11471.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
The island of Sri Lanka is free from serious natural hazards such as volcanic activity and earthquakes resulting from climatic extremes, but there are impacts of many natural disasters, such as landslides, floods and droughts, the intensity and frequency of which are increasing due to human interventions. Some areas of Sri Lanka are also periodically subject to cyclones that occur due to climatic conditions and geographical locations. Land degradation denotes all natural or anthropogenic processes that diminish or impair productivity of land. This occurs mainly through soil erosion, loss of organic matter and nutrients in the soil; salinization and large scale land degradation in Sri Lanka. Its manifestations today are heavy loss of soil, siltation in the water bodies, reservoirs and coastal waters, unplanned settlements, loss of arable land leading to declining productivity in agricultural lands and intensification of impacts of natural hazards such as flooding and landslides. Land degradation is a major problem in Eastern Coastal Area from Kalmunai MC, Karaitivu and Nintavur Divisional Secretariat Divisions (DSDs) of Ampara District. However, there is a considerable spatial heterogeneity exists within this area in terms of land use, topography, land management and socio-economic conditions. Therefore, land degradation assessment studies are very important for the sustainable development of the area. Considering the above background, this study was conducted with the objectives of developing a land degradation assessment model using a GIS based approach.
Źródło:
International Letters of Natural Sciences; 2016, 53
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rainfall Variability of South-West Monsoon: A Special Study Based on Ratnapura District, Sri Lanka
Autorzy:
Kaleel, M. I. M.
Powiązania:
https://bibliotekanauki.pl/articles/1112561.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Climate change
Meteorological Department
Moving average
Rainfall variability
Ratnapura District
Sri Lanka
Opis:
This study was conducted using secondary data from the Meteorological Department obtained from five stations in Ratnapura District: Ratnapura, Eheliyagoda, Balangoda, Lellopitiya and Embilipitiya. The objective of the study was ‘to identify rainfall trend and variability analysis in the study area and to find the impact of climate changes on rainfall variability in the study area’. The average rainfall in the selected stations are: in Embilipitiya - between 112 mm to 170 mm, in Balangoda - from 170 mm to 230 mm, Lellopitiya – from 230 mm - 290 mm and both Ratnapura and Eheliyagoda - 290 mm to 360 mm. To identify the rainfall variability, the moving average technique was employed, using 7 years of data. According to the result of this study, climate change has impact on rainfall variability in the Ratnapura District.
Źródło:
World News of Natural Sciences; 2018, 18, 2; 195-202
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of initial stress and gravity field on micropolar thermoelastic solid with microtemperatures
Autorzy:
Othman, M. I. A.
Tantawi, R. S.
Hilal, M. I. M.
Powiązania:
https://bibliotekanauki.pl/articles/949315.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
gravity
initial stress
micropolar thermoelasticity
microtemperatures
Opis:
The purpose of the present article is the study of the effect of the gravity field on an initially stressed micropolar thermoelastic medium with microtemperatures. The analytical method used to obtain the formula of the physical quantities is the normal mode analysis. The comparisons are established graphically in the presence and the absence of gravity, initial stress and micropolar thermoelasticity. The main conclusions state that the gravity, initial stress and the micropolar thermoelasticity are effective physical operators on the variation of the physical quantities. The microtemperatures are very useful theory in the field of geophysics and earthquake engineering.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 847-857
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The folk-medicinal plants of Kadisehri (Yozgat - Turkey)
Autorzy:
Han, M.I.
Bulut, G.
Powiązania:
https://bibliotekanauki.pl/articles/57574.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
medicinal plant
ethnobotany
traditional medicine
Kadisehri
Yozgat
Turkey
Opis:
This paper contains significant ethnobotanical information on folk-medicinal plants and their ethnopharmacological uses in Kadięehri. The aim of the study was mainly to collect and identify the plants used therapeutically by the local people, and to make available information about traditional herbal medicine. It was undertaken during the period 2011-2012 and is based on plants collected during field work. Fifty-six plants used in folk-medicine and belonging to 34 families were identified in this study. Of these, 48 species were wild, and 8 species were cultivated plants. The most common families were Rosaceae (12.5%), Lamiaceae (8.9%) and Asteraceae (7.1%); and the most common preparations were decoctions (36.7%). In addition, a cultural importance index (CI) and use report (UR) were calculated for each species. Based on the CI, the most important plants were Cydonia oblonga (0.77), Ecballium elaterium (0.66), Urtica urens (0.66), Vitis vinifera (0.66), Plantago lanceolata (0.65), Plantago major subsp. major (0.65) and Rosa canina (0.62). We found three species of plant (Astragalus noaeanus, Populus xcanescens and Salvia cyanescens) which had never before been reported to have medicinal properties.
Źródło:
Acta Societatis Botanicorum Poloniae; 2015, 84, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The length-biased power hazard rate distribution: Some properties and applications
Autorzy:
Mustafa, Abdelfattah
Khan, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/2106877.pdf
Data publikacji:
2022-06-14
Wydawca:
Główny Urząd Statystyczny
Tematy:
length-biased
power hazard rate distribution
maximum likelihood estimation
Opis:
In this article, the length-biased power hazard rate distribution has introduced and investigated several statistical properties. This distribution reports an extension of several probability distributions, namely: exponential, Rayleigh, Weibull, and linear hazard rate. The procedure of maximum likelihood estimation is taken for parameters. Finally, the applicability of the model is explored by three real data sets. To examine, the performance of the technique, a simulation study is extracted.
Źródło:
Statistics in Transition new series; 2022, 23, 2; 1-16
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of mercury content on the structural changes of bioindicator surfaces
Autorzy:
Szynkowska, M.I.
Pawlaczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/778709.pdf
Data publikacji:
2007
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
rtęć
analiza powierzchni
bioindykator
SEM
mercury
surface analysis
bioindicators
Opis:
This work examines the recommended chemical analytical method for the identification and detecting mercury from the environmental media. The aim of this study was to establish a correlation between mercury content in different biological indicators like: human hair, mushrooms, lichen, moss and needle samples, and the changes in the structure of the investigated material. We have explored the possibilities of using the SEM method in environmental studies to investigate a variety of biological samples coming from areas at different pollution state. We have combined the information from the quantity measurements with the qualitative analysis. The total content of Hg was determined using the Automatic Mercury Analyzer SP-3D. The accuracy of the applied method was verified by an analysis of proper certificate materials: Mixed Polish Herbs INCT-MPH-2, Lichen CRM 482, Pine needles 1575a and Human Hair NCS ZC 81002. The obtained results proved a direct influence of the content of mercury and environmental pollution on the damage of the structure of the studied samples.
Źródło:
Polish Journal of Chemical Technology; 2007, 9, 4; 115-120
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison between first generation and second generation of family business in the United Arab Emirates (UAE)
Porównanie między pierwszą generacją a drugą generacją rodzinnych biznesów w Zjednoczonych Emiratach Arabskich (ZEA)
Autorzy:
Jawabri, A.
Obeidat, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/404781.pdf
Data publikacji:
2018
Wydawca:
Politechnika Częstochowska
Tematy:
small and medium enterprises
progression dilemma
feature and planning
małe i średnie przedsiębiorstwa
dylemat progresji
funkcja i planowanie
Opis:
The paper focuses on generation based business arranging in family-owned businesses of Abu Dhabi in the United Arab Emirates (UAE). The paper contends that to a specific degree the entrepreneurs of SME confront a few challenges while different factors, for example, business obstructions, administrative capability, equitable are identified with the movement highlights. The outcome demonstrates that there is a clear relationship among generation based business arranging, entrepreneur highlights and progression difficulty and number of representatives, the status of generation based business arranging and year of business encounters. In the generation-based business arranging model, just entrepreneur highlights and movement situation do impact generation based business arranging. The discoveries demonstrate that SMEs are when all is said in done concentrated on generation based business arranging even though it is fundamental. The paper winds up with a couple of suggestions for the further research in generation based business arranging of the family-owned business.
Artykuł koncentruje się na biznesie opartym na pokoleniach w firmach rodzinnych w Abu Dhabi w Zjednoczonych Emiratach Arabskich (ZEA). W artykule stwierdzono, że w pewnym stopniu przedsiębiorcy MŚP stają wobec kilku wyzwań, podczas gdy różne czynniki, na przykład przeszkody biznesowe, zdolność administracyjna, są identyfikowane jako najważniejsze. Rezultat tego badania pokazuje, że istnieje wyraźna zależność między organizacją biznesową opartą na pokoleniu, z uwypukleniem przedsiębiorcy i stopniem zaawansowania oraz liczbą przedstawicieli, stanem organizacji biznesowych opartych na pokoleniach i rokiem. W modelu aranżacji biznesu opartym na pokoleniach, po prostu uwypuklenie przedsiębiorcy i sytuacja w ruchu są efektem aranżacji opartej na wytwarzaniu opartym na pokoleniu. Odkrycia pokazują, że małe i średnie przedsiębiorstwa są wtedy, gdy wszystko jest powiedziane, skoncentrowane na tworzeniu biznesu opartego na wytwarzaniu energii, mimo że ma ono fundamentalne znaczenie. Dokument kończy się kilkoma propozycjami dalszych badań w zakresie biznesowego prowadzenia rodzinnego biznesu opartego na wytwarzaniu energii.
Źródło:
Polish Journal of Management Studies; 2018, 18, 2; 162-175
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drapiezne grzyby nicieniobojcze
Autorzy:
Czygier, M
Bogus, M.I.
Powiązania:
https://bibliotekanauki.pl/articles/841412.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
pasozyty zwierzat
nicienie zoladkowo-jelitowe
parazytologia
grzyby nicieniobojcze
zwalczanie pasozytow zwierzat
grzyby drapiezne
Opis:
Gastrointestinal nematodes are considered a serious economic problem affecting the livestock industry around the world. Current methods of their control, relaying mainly on organic drugs, are not sustainable because parasites develop resistance to anthelmintic and bacause of increasing public concem about chemicals residues in livestock products and environment. Nematode-trapping fungi offer a very promissing, nonchemotherapeutic approach to nematode parasite control. Their potential in preventing nematodosis is well documented. In this paper we outline the present knowlege on mechanisms involved in trapping and killing nematodes by the predacious nematode-destroying fungi.
Źródło:
Annals of Parasitology; 2001, 47, 1; 25-31
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drapieżne grzyby nicieniobójcze
Autorzy:
Czygier, M.
Boguś, M.I.
Powiązania:
https://bibliotekanauki.pl/articles/2147832.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
pasozyty zwierzat
nicienie zoladkowo-jelitowe
parazytologia
grzyby nicieniobojcze
zwalczanie pasozytow zwierzat
grzyby drapiezne
Opis:
Gastrointestinal nematodes are considered a serious economic problem affecting the livestock industry around the world. Current methods of their control, relaying mainly on organic drugs, are not sustainable because parasites develop resistance to anthelmintic and bacause of increasing public concem about chemicals residues in livestock products and environment. Nematode-trapping fungi offer a very promissing, nonchemotherapeutic approach to nematode parasite control. Their potential in preventing nematodosis is well documented. In this paper we outline the present knowlege on mechanisms involved in trapping and killing nematodes by the predacious nematode-destroying fungi.
Źródło:
Wiadomości Parazytologiczne; 2001, 47, 1; 25-31
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Możliwość biodegradacji węglowodorów ropopochodnych w glebach zanieczyszczonych przez przemysł naftowy
Biodegradation potential of total petroleum hydrocarbons in oil industry contaminated soils
Autorzy:
Kopytko, M.
Mojica, D. M. I.
Powiązania:
https://bibliotekanauki.pl/articles/318710.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
bioremediacja
bioregeneracja
gleby
całkowita zawartość węglowodorów (TPH)
biorremediation
soils
total petroleum hydrocarbons (TPH)
Opis:
Zbadano gleby zanieczyszczone przez przemysł naftowy pochodzące z pola naftowego Santander w Kolumbii. Gleby charakteryzowały się trzema różnymi okresami trwania zanieczyszczenia związkami ropopochodnymi. Wszystkie badane gleby wykazywały szybką infiltrację i wysoką przepuszczalność, co jest charakterystyczne dla gleb piaszczystych. Pomimo to, hydrofobowy charakter węglowodorów miał wpływ na ich zdolność retencji wody i porowatość. Stosunek pierwiastków węgiel: azot, fosfor, temperatura i pH ocenione dla badanych gleb wykazywały optymalne wartości - odpowiednie dla procesu bioremediacji [bioregeneracji]. Najlepsze wyniki pod względem usuwania węglowodorów (42,6%) uzyskano wówczas, gdy próbki gleby oczyszczano oddzielnie, mieszając je z czystą, pozbawioną nie tylko dodatku wybranej i rozwiniętej mieszaniny drobnoustrojów, lecz również pozbawionej wstępnego działania bio-surfaktantów, (Serratia) gleby. Mieszanina gleb składająca się w 50% z gleby o najdłuższym okresie zanieczyszczenia oraz po 25% gleb o średnim i krótkim okresie zanieczyszczenia wykazała średni stopień usunięcia sumy węglowodorów ropopochodnych (TPH - total petroleum hydrocarbons) wynoszący 28,6%). Gleba ta została poddana wstępnemu działaniu biosulfactantu przez okres tygodnia oraz dodano do niej mieszanki drobnoustrojów na początku i w połowie trzytygodniowego okresu biodegradacji. Biorąc pod uwagę, że prowadząc biodegradację gleby używając wyłącznie mieszaniny zanieczyszczonych gleb do tego celu pozwala się uniknąć przenoszenia zanieczyszczenia do czystej gleby, i oczyszczanie za pomocą tej techniki pozwoliło osiągnąć 3,0% zawartości końcowej TPH (wartość zalecana przez Zarządzenie 29B Stanu Louisiana, stosowane w Kolumbii), takie oczyszczanie byłoby zalecane w połączeniu z optymalnymi stwierdzonymi warunkami oczyszczania.
Three sources of soil with different petroleum contamination ages were studied in an oil field in the province of Santander, Colombia. All the studied soils showed rapid infiltration and high permeability, characteristics of sandy soils. Nonetheless, water retention capacity and porosity were affected by the hydrophobic character of the hydrocarbons. The carbon-nitrogen-phosphorus ratio, temperature and pH evaluated in the contaminated soils, showed optimum values, adequate for bioremediation processes. The best results, in terms of hydrocarbon elimination (42.6%), were obtained when the soils were treated separately, mixed with clean soil, lacking not only the addition of the selected and enlarged mixed microbial pool, but also the pre-treatment with the bio-surfactant, which was composed by bacteria of the genus Serratia. The soil mixture composed of 50% of the soil with the oldest contamination, and an equal 25% proportion of both the medium and shortest contamination age soils, showed a total petroleum hydrocarbon (TPH) elimination percentage of 28,6%. This soil underwent one week of pretreatment process, and a mixed microbial pool addition at the beginning and half way through a three-week biodegradation treatment period. An independent remediation treatment, without addition of both pre-treatment and microbial pool was conceived for the initial treatment design. However, considering that biodegrading soil solely as a mixture of contaminated soils avoids the transfer of contaminants to the clean soil, and that the best treatment using this technique reached a 3,0% content of total hydrocarbons (value recommended by the Louisiana 29B regulation), this treatment was recommended combined with the optimum treatment conditions obtained.
Źródło:
Inżynieria Mineralna; 2009, R. 10, nr 2, 2; 31-48
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rainfall Variability in the wet-dry seasons. An analysis in Batticaloa District, Sri Lanka
Autorzy:
Mathanraj, S.
Kaleel, M. I. M.
Powiązania:
https://bibliotekanauki.pl/articles/1118352.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Flood
Meteorology
Rainfall variability
Wet-dry
Opis:
Rainfall is of primary importance to both the physical and cultural landscape of any region. The objective of this study is to find the trends for rainfall variability on climate change in Batticaloa District of Sri Lanka, by analyzing 146 years of monthly data of rainfall received during the period 1869-2014 from the meteorological station of the Department of Meteorology. Some studies attribute extreme events to rainfall variability due to climate change induced by global warming. However, there is a dearth of climatological studies addressing the trends in rainfall over Sri Lanka in support of such attribution. In our study, statistical analysis such as linear and standard deviation for 3 year, 5 year, 11 year and 21 year periods were utilized to examine periodic rainfall changes in both annual and seasonal contexts. The study finds that the 3, 5 year moving average shows high drier seasons, but the 11, 21 years moving average show higher wet seasons during the period of study. The changes of rainfall are known to have led to disasters such as flood and drought. Annual rainfall varies from 864 mm to 3081 mm, the distribution of which has sight variation throughout the district.
Źródło:
World News of Natural Sciences; 2017, 9; 71-78
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Rainfall Variability on Paddy Production: A Case Study in Batticalloa District
Autorzy:
Mathanraj, S.
Kaleel, M. I. M.
Powiązania:
https://bibliotekanauki.pl/articles/1189997.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Agriculture
Meteorology
Paddy production
Rainfall variability
Opis:
Climate change has become a major concern to human society because of its potentially deleterious impact worldwide. The degree to which rainfall amounts vary across an area or through time is an important characteristic of the climate of an area. This subject area in meteorology is called "rainfall variability”. Changes in amount, intensity and frequency affect the environment and society. The annual rainfall varies from 864 mm to 3081 mm (146 years data) distribution, which has sight variation throughout the district. The study purposes to examine the relationship between rainfall and paddy production. Samplings from 100 households have been gathered by questionnaire survey as primary data and the secondary data has been collected Meteorological Department, Department of Agriculture and published research reports. 146 years rainfall data and 34 years paddy cultivation data has been utilized to analyse the result. Accurate statistical methods have been used to find the variability that includes correlation and trend analysis of 3, 5 years moving average of standard deviation. As the result, the study finds that through the 3, 5 years moving average had shown high drier seasons of the years. The paddy production was very high in Maha season but this was very low in Yala season because of the rainfall variability. By the correlation between rainfall and paddy production, the significant value is positive in Maha season and this is negative in Yala season. However, both are having the different significance each other. Thus, even the rainfall was highly influenced to the higher production, this is impossible in each time. Therefore, the development of irrigation tanks and channels, rainwater harvesting and proper management would be supported to more production in Yala season.
Źródło:
World Scientific News; 2016, 52; 265-275
2392-2192
Pojawia się w:
World Scientific News
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:
Assessment of iron oxide and local cement clay as potential fluoride adsorbents
Autorzy:
Atasoy, A. D.
Yesilnacar, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/207691.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
drinking water purification
membrane process
fluorine
fluor
procesy membranowe
oczyszczanie wody pitnej
Opis:
Health problem from fluoride contaminated water is more acute in rural and small urban communities. Defluoridation of low contaminated water by inexpensive adsorbents is a substantial practice worldwide. In the study, low-cost sorbents have been investigated as replacements for current costly methods of removing the excess fluoride from water below the certain concentration. The adsorption capacity of iron oxide and cement clay in fluoride removal was investigated by the batch method. The equilibrium time was attained in 3 h and 2 h for iron oxide and cement clay, respectively. Optimum adsorbent dosage was found to be 5 g/dm3. Initial fluoride concentrations for the adsorption studies were 1.24 and 12.2 mg/dm3. Fluoride adsorption isotherm fitted well the Freundlich isotherm with the coefficient of determination >0.99 for both adsorbents. The fluoride adsorption capacity of iron oxide was found higher than that of cement clay due to the high surface area and charge of iron oxide. How-ever both substances can reduce F– contamination below the acceptable limits of 1.5 mg/dm3 for less contaminated water.
Źródło:
Environment Protection Engineering; 2017, 43, 2; 109-118
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical model to study the combustion process and emissions in the Wartsila 6L 46 four-stroke marine engine
Autorzy:
Lamas, M. I.
Rodriguez, C. G.
Powiązania:
https://bibliotekanauki.pl/articles/259746.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine engine
emissions
combustion
CFD Computational Fluid Dynamics
Opis:
The aim of the present paper is to develop a computational fluid dynamics (CFD) analysis to study the combustion process in a four-stroke marine diesel engine, the Wärtsilä 6L 46. The motivation comes from the importance of emissions from marine engines in the global emissions, particularly for nitrogen oxides (NOx) and sulfur oxides (SOx). The pressure and temperature fields were obtained, as well as the exhaust gas composition. In order to validate this work, the numerical results were satisfactory compared with experimental ones, which indicates that this model is accurate enough to reproduce the fluid pattern inside the cylinder during the combustion process. Accordingly, the aim of future works is to use this numerical procedure to optimize the performance and reduce the emissions of the new marine engine designs.
Źródło:
Polish Maritime Research; 2013, 2; 61-66
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of human cystic echinococcosis before and after surgery and chemotherapy by demonstration of antibodies in serum
Autorzy:
Tenguria, R.K.
Naik, M.I.
Powiązania:
https://bibliotekanauki.pl/articles/6221.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
human disease
cystic echinococcosis
echinococcosis
surgery
chemotherapy
antibody
immunodiagnosis
ELISA test
Opis:
Human cystic echinococcosis (CE), caused by Echinococcus granulosus, is one of the most important and widespread parasitic zoonoses. As one of the problems that can be encountered after treating CE patients is the risk of postsurgical relapses or treatment failure, a long-term clinical and serological follow-up is required to evaluate the success and failure of therapy. Therefore, the aim of the present study was to identify the best diagnostic and prognostic ELISA markers in patients with CE. The cohort comprised 50 patients with symptomatic CE treated with antihelminthic drugs and surgery, who were followed up clinically and radiologically for a mean of 6 years (range 4–8 years). The results clearly indicate that the hydatid specific antibodies of IgE, IgG1 and IgG4 are the most important antibodies for the serological diagnosis of cystic echinococcosis during the active stage of the disease. None of the serum samples from healthy controls gave a non-specific reaction with IgE, IgG1 or IgG4, and a considerably reduced cross-reaction was observed with these antibodies. During post-operative follow-up, the IgM, IgE, IgG1, IgG2 and IgG4 antibody response provided the best correlate of disease activity. The detection of total IgG and IgG3 subclass antibody response for the assessment of post-treatment disease activity among CE patients was insensitive. All patients responded to treatment except 2 women (32 and 36 years old), in whom multiple cysts (12 and 7 cysts) were detected in the liver and lung two years after the first operation. Hence, it can be concluded that the CE-specific antibodies of IgE, IgG1 and IgG4 are the best immunological markers for diagnosis and prognosis of CE patients.
Źródło:
Annals of Parasitology; 2014, 60, 4
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coastal morphodynamics associated natural hazards: a case study of Oluvil area in Ampara district, Sri Lanka
Autorzy:
Nijamir, K.
Kaleel, M. I. M.
Powiązania:
https://bibliotekanauki.pl/articles/1177917.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
GIS
Tidal action
biodiversity
littoral change
morphodynamic
natural hazard
Opis:
The tidal action is one of the most significant forces of the littoral changes. This study mainly focuses on coastal morphodynamics associated hazards which are caused by the natural phenomena. The study area, which is covered about 16 km in length, is rich by coastal resources and has an abundance of natural biodiversity. The objectives of this study (a) to identify the coastal morphodynamics associated hazards by the waves in the study area and (b) to detect coastal morphodynamics using time series data from 1981 to 2015 and to show the intensity of shoreline changes with the aid of Geo Spatial Technology. For this study, Aerial photograph in 1981 and satellite images of 2001 and 2015 used to identify the costal morphodynamics of the study area and they were subjected to the analysis with the aid of GIS 10.5 software. This study is concluded that the coastal morphodynamics associated hazards have been identified heavily in the study area due to the severe wave action.
Źródło:
World Scientific News; 2018, 97; 113-124
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GIS Based Flooding Analysis Kaluwanchikudy DS Division
Autorzy:
Mathanraj, S.
Kaleel, M. I. M.
Powiązania:
https://bibliotekanauki.pl/articles/1112508.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Disaster Management
Kaluwanchikudy
SRTM
Severity level
drainage system
flooding
Opis:
The major objective of this study is to identify the flood severity level of the study area using GIS applications. By employing this map, safer habitation zones were established. Direct personal observation and face-to-face interview was done to gather the primary data and Disaster Management center reports, Census reports of Sri Lanka, images and published research reports were used as secondary data. The severity level of flooding in this area was analyzed using SRTM imagery in ArcGIS and overlaid on a Google Earth pro map. The findings of the study established that the highly affected area consisted of around 8.953003 sq·km, the moderately affected area was around 9.190781 sq·km and the lowly affected area was approximately 9.31039 sq·km within the study area. The major causes for flood disaster in this area are the lack of drainage systems in some potential flood regions, the low landscape, poorly maintained drainage systems and the geographical arrangement of the road network. By creating this map, the inhabitants will be aware of danger areas and can relocate accordingly [3, 5-9].
Źródło:
World News of Natural Sciences; 2018, 18, 2; 114-123
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The environmental challenges of declining mangroves: an analytical survey in Puttalam District in Sri Lanka
Autorzy:
Kaleel, M. I. M.
Nijamir, K.
Powiązania:
https://bibliotekanauki.pl/articles/1113693.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
biodiversity
environment
land fragmentation
mangrove
Opis:
This study under the title of “the environmental challenges of declining mangroves: a study based on Puttalam District in Sri Lanka” was undertaken to attain the primary objective ‘to identify the factors for the declining of the mangroves in the study area’ and the secondary objectives ‘identify the environmental challenges due to the mangroves declining in the study area and to suggest was to control the decline and to provide awareness of this problem among the inhabitants’. Both, primary and secondary data were collected for this study. As primary data, questionnaire survey, direct observation and constructed discussion were used. As secondary data, statistic reports, previous researches, books and magazines were employed. According to the analysis, major environmental challenges were encountered. These included ‘land fragmentation, biodiversity destruction, decreasing endemism in mangrove, loss of herbs and coastal soil erosion’. To overcome these challenges, many recommendations were put forward.
Źródło:
World News of Natural Sciences; 2017, 14; 106-115
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of diffusion and internal heat source on a two-temperature thermoelastic medium with three-phase-lag model
Autorzy:
Othman, M. I.
Said, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/240881.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
diffusion
Green-Naghdi theory
internal heat source
three-phase-lag model
two-temperature
dyfuzja
teoria Greena-Naghdiego
źródło ciepła
Opis:
The purpose of this paper is to depict the effect of diffusion and internal heat source on a two-temperature magneto-thermoelastic medium. The effect of magnetic field on two-temperature thermoelastic medium within the three-phase-lag model and Green-Naghdi theory without energy dissipation i discussed. The analytical method used to obtain the formula of the physical quantities is the normal mode analysis. Numerical results for the field quantities given in the physical domain are illustrated on the graphs. Comparisons are made with results of the two models with and without diffusion as well as the internal heat source and in the absence and presence of a magnetic field.
Źródło:
Archives of Thermodynamics; 2018, 39, 2; 15-39
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thickness Dependence of Effective Critical Exponents in Three-Dimensional Ising Plates
Autorzy:
Marqués, M. I.
Gonzalo, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/2014019.pdf
Data publikacji:
2000-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Hk
64.60.Fr
75.70.-i
02.50.Ng
Opis:
Phase transitions in Ising plates of equal area and different thicknesses have been studied by the Monte Carlo approach. The evolution of the critical temperature and of the effective critical exponents with the thickness of the lattice has been numerically determined. The thickness dependence of the maximum value of the effective critical exponents is well described by an exponential decay towards the respective three-dimensional value.
Źródło:
Acta Physica Polonica A; 2000, 97, 6; 1033-1037
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sequential optimization for semilinear divergent hyperbolic equation with a boundary control and state inequality constraint
Autorzy:
Gavrilov, V. S.
Sumin, M. I.
Powiązania:
https://bibliotekanauki.pl/articles/206311.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Radon measures
sequential optimization
maximum principle for minimizing sequences
semilinear hyperbolic partial differential equations
pointwise in time state constraints
boundary control
value function
sensitivity
normality
regularity
twoparameter needle variation of controls
Opis:
An optimal control problem with a state constraint of inequality type and with dynamics described by a semilinear hyperbolic equation in divergence form with the non-homogeneous boundary condition of the third kind is considered. The state constraint contains a functional parameter that belongs to the class of continuous functions and occurs as an additive term. We study the properties of solutions of linear hyperbolic equations in divergence form with measures in the original data and compute the first variations of functionals on the basis of a so-called two-parameter needle variation of controls. We consider the necessary conditions for minimizing sequences in an optimal control problem with a pointwise in time state constraint of inequality type and with dynamics described by a semilinear hyperbolic equation in divergence form with the non-homogeneous boundary condition of the third kind. For the parametric optimization problem, we also consider regularity and normality conditions stipulated by the differential properties of its value function.
Źródło:
Control and Cybernetics; 2014, 43, 2; 183-226
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the eigenvalues of a 2 x 2 block operator matrix
Autorzy:
Muminov, M. I.
Rasulov, T. H.
Powiązania:
https://bibliotekanauki.pl/articles/254735.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
block operator matrix
Fock space
discrete and essential spectra
Birman-Schwinger principle
Efimov effect
discrete spectrum asymptotics
embedded eigenvalues
Opis:
A 2 x 2 block operator matrix H acting in the direct sum of one- and two-particle subspaces of a Fock space is considered. The existence of infinitely many negative eigenvalues of H22 (the second diagonal entry of H) is proved for the case where both of the associated Friedrichs models have a zero energy resonance. For the number N(z) of eigenvalues of H22 lying below z < 0, the following asymptotics is found [formula]. Under some natural conditions the infiniteness of the number of eigenvalues located respectively inside, in the gap, and below the bottom of the essential spectrum of H is proved.
Źródło:
Opuscula Mathematica; 2015, 35, 3; 371-395
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on a one-parameter family of non-symmetric number triangles
Autorzy:
Falcao, M. I.
Malonek, H. R.
Powiązania:
https://bibliotekanauki.pl/articles/255973.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Clifford analysis
generalized Appell polynomials
number triangle
central binomial coefficient
binomial identity
Opis:
The recent growing interest in special Clifford algebra valued polynomial solutions of generalized Cauchy-Riemann systems in (n + 1)-dimensional Euclidean spaces suggested a detailed study of the arithmetical properties of their coefficients, due to their combinatoric relevance. This concerns, in particular, a generalized Appell sequence of homogeneous polynomials whose coefficient set can be treated as a one-parameter family of non-symmetric triangles of fractions. The discussion of its properties, similar to those of the ordinary Pascal triangle (which itself does not belong to the family), is carried out in this paper.
Źródło:
Opuscula Mathematica; 2012, 32, 4; 661-673
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pluteus aurantiorugosus (Trog) Sacc. and Coprinus patouillardii Quel. - new records of macrofungi for Romania
Autorzy:
Radu, M.-I.
Sesan, T.-E.
Powiązania:
https://bibliotekanauki.pl/articles/67579.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Pluteus aurantiorugosus
Coprinus patouillardii
new record
rare species
fungi
endangered fungi
taxonomy
macrofungi
Bucharest area
Romania
Źródło:
Acta Mycologica; 2013, 48, 2
0001-625X
2353-074X
Pojawia się w:
Acta Mycologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influencing Spatial and Temporal Patterns of Road Accidents: A Study on Nuwara – Eliya District
Autorzy:
M. Kaleel, M. I. M.
Sathyaruban, M.
Powiązania:
https://bibliotekanauki.pl/articles/1114191.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Traffic
fatality
injury
physical features
Opis:
In the global context, about 1.25 million people die each year as a result of road traffic crashes. Moreover, road traffic injuries are the leading cause of death among young people, aged 15–29 years. Furthermore, 90% of the world's road fatalities occur in low- and middle-income countries (WHO, 2017). In Sri Lanka, the accident rate is increasing rapidly. According to the transport and civil aviation report, 2801 deaths, 2590 fatal accidents, 13,095 minor accidents, and 7719 critical accidents occurred in Sri Lanka in 2015. The trend of the accidents has been increasing due to many factors. Physical features of the roads and roadsides, behaviour of drivers and pedestrians are the main influence on the occurrence of accidents. Central province has many accidents-prone areas due to its spatial and temporal patterns. Landform and climatic factors such as fog, snow and rainfall trigger accident potentials. Therefore, this study, “Spatial and temporal patterns of road accidents and their challenges: a study on Nuwara-Eliya District” investigates reasons for the enhanced rate of traffic mishaps. This is the first such study of this phenomenon. Herein, we used primary and secondary data. The results indicate that physical features are mainly to blame.
Źródło:
World News of Natural Sciences; 2017, 10; 1-9
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emerging challenges of urbanization: a case study of Kalmunai municipal area in Ampara district
Autorzy:
Muneera, M. B.
Kaleel, M. I. M.
Powiązania:
https://bibliotekanauki.pl/articles/1192842.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Urbanization
Population
SWOT analysis
Sri Lanka and Cities
Opis:
Urban population refers to people living in urban areas as defined by national statistical offices. It is calculated using World Bank population estimates and urban ratios from the United Nations World Urbanization Prospects. Aggregation of urban and rural population may not add up to total population because of different country coverages. The study based on the Kalmunai MC area and the main objective of this study is to identify the emerging challenges of urbanization in the study area. The study used the methodologies are primary data collection as questionnaire, interview, observation and the secondary data collection and SWOT analysis to made for getting the better result. The study finds that the SWOT analysis process provided a number of results and ideas for future planning. Collecting the results around themes has highlighted the breadth of ideas within KMC. A number of common issues emerged which require immediate action and clearly relate to developing KMC as a resilient urban. However, to generate energy requires heap quantities of plastic wastage and as a result of the process a byproduct of methane will be produced. Nevertheless, this process is not much financially viable as the quantities are limited in Sri Lanka. Control of water pollution is the demand of the day cooperation of the common man, social organizations, natural government and non -governmental organizations; is required for controlling water pollution through different curative measures. Domestic waste and sewage may treat before following them directly in drinking water sources.
Źródło:
World Scientific News; 2016, 59; 35-51
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationships between water temperature, nutrients and dissolved oxygen in the Northern Gulf of Aqaba, Red Sea
Autorzy:
Manasrah, R.
Raheed, M.
Badran, M.I.
Powiązania:
https://bibliotekanauki.pl/articles/49092.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
stratification
nutrient
Aqaba Gulf
temperature
sea water
Red Sea
oxygen
Opis:
Five years (1998, 2000–2003) of summer records of temperature, nutrients and dissolved oxygen concentrations in the upper 400 m of the water column of the northern Gulf of Aqaba were employed to produce a simple statistical model of the relationship between temperature versus nitrate, phosphate, silicate andd issolved oxygen concentrations. Temperature profiles in the upper 400 m during summer revealeda clear thermocline in the upper 200 m. This was reflected in nutrient ando xygen concentrations as nitrate, phosphate, and silicate increasedfr om the surface to deep water while dissolved oxygen decreased. The best fit relationship between temperature versus nitrate andphosphate was inverse linear and the best fit correlation between temperature versus silicate andd issolvedo xygen was fractional. The observedn utrient concentrations were shaped by a combination of the hydrodynamics and biological factors. Deep winter mixing and high nutrient concentrations dominate during winter. Shortly after the water stratifies in spring, the nutrients are drawn down by phytoplankton during the spring bloom and remain low throughout the rest of the year. The regression equations presented here will be useful in estimating nutrient concentrations from temperature records as long as the annual natural cycle is the main driver of nutrient concentrations and external inputs are insignificant. Deviations from these relationships in the future could provide insight into modifications in the nutrient concentrations probably resulting from new nutrient sources, such as anthropogenic inputs.
Źródło:
Oceanologia; 2006, 48, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Główne źródła rtęci w organizmach ludzi nie narażonych zawodowo
Main sources of mercury in human organisms not exposed professionally
Autorzy:
Leśniewska, E.
Szynkowska, M,I.
Paryjczak, T.
Powiązania:
https://bibliotekanauki.pl/articles/1819820.pdf
Data publikacji:
2009
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
rtęć
źródła rtęci
organizm ludzki
mercury
sources of mercury
human organism
Opis:
Rtęć zajmuje jedno z pierwszych miejsc na liście najbardziej niebezpiecznych, globalnych zanieczyszczeń środowiska. Nie pełni żadnej znanej roli biologicznej, jest natomiast toksyczna dla wszystkich żywych organizmów. Skażenie rtęcią, początkowo postrzegane jako poważny problem lokalny, stanowi obecnie problem powszechny. Wynika to ze specyficznej natury tego metalu, która zdeterminowana jest mnogością jego form, dużą lotnością i ruchliwością w środowisku. Toksyczne działanie rtęci i jej związków zależy głównie od formy w jakiej występuje (rtęć elementarna, nieorganiczne i organiczne związki rtęci), od drogi wniknięcia do organizmu, dawki oraz czasu ekspozycji. Najbardziej groźne dla człowieka (zwłaszcza dla płodu i małych dzieci) są organiczne związki metylortęciowe, ponieważ uszkadzają one przede wszystkim ośrodkowy układ nerwowy [58÷61]. Rtęć uwolniona do środowiska naturalnego pozostaje w nim, przemieszczając się w różnej postaci pomiędzy jego elementami: powietrzem, wodą, osadami, glebą oraz organizmami żywymi. Ze względu na swoją stosunkowo dużą lotność może zostać przeniesiona na duże odległości. Nie ulega biodegradacji i dlatego bardzo długo utrzymuje się w środowisku, gromadząc się w łańcuchach troficznych i przedostając się do organizmu ludzkiego. W środowisku naturalnym rtęć występuje głównie w łupkach węglowych i łupkach bitumicznych oraz zasadowych skałach krystalicznych, w glebach gliniastych i torfowych, oraz stanowi zanieczyszczenie paliw kopalnych.
Toxic sources of mercury emission into the environment and human organisms were given. The strategy of Union concerning mercury as well as some of its decisions were presented. In the case of people not exposed to mercury professionally diet rich in fish and dental amalgam are the main sources of mercury. Some results of studies of mercury content in fish were presented. Current regulations in force determining maximal acceptable norms for mercury content in fish, fish products and diet supplements were given. It was pointed out that 75-95% of mercury in fish and seafood is in the form of methylmercury, which is the strong neurotoxin, the current PTWI norm (EFSA) is 1.6 žg of methylmercury compounds per a kilo of body mass (1.6 žg/kg bw/week). The amounts of mercury found in ford products other than fish and seafood are not so worrying because in the case of these products mercury does not appear in the form of methylmercury, which poses less threat. Mercury amalgams used as dental fillers were characterized. UE does not recommend amalgams as dental fillers. Even those in favour using claim that a man should not have more than 6-7 of such fillers them. So far no studies proved that the amount of mercury released from a amalgam dental fillers into organism is can lead to poisoning. However, authors of many studies of mercury content in hair or urine carried out in 2 groups of people which and without amalgam dental fillers found out that the content of mercury was noticeably higher among those with the amalgam fillers. It was recognized that using amalgam without gamma -2 phase would reduce the exposure to mercury. Amalgam dental fillers should not be used in the case of pregnant women and people suffering from kidney disorders. Some attention was paid to mercury compounds which can possibly appear as preservation substances (mainly thimerosal) in some cosmetics, medicines and vaccines. Methods of mercury analysis were presented. 57 publications were cited.
Źródło:
Rocznik Ochrona Środowiska; 2009, Tom 11; 403-419
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal and diel changes in the vertical distribution in relation to the age structure of Microcalanus pygmaeus Sars and Ctenocalanus citer Bowman and Heron, (Pseudocalanidae, Copepoda) from Croker Passage (Antarctic Peninsula)
Autorzy:
Zmijewska, M.I.
Bielecka, L.
Grabowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/47951.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
zooplankton
Antarctic
coastal water
Microcalanus pygmaeus
Pseudocalanidae
vertical distribution
plankton
Ctenocalanus citer
age structure
Antarctic Peninsula
seasonal change
Copepoda
Opis:
The development of two representatives of Pseudocalanidae and the nature of their population distribution in the water column were investigated on the basis of plankton samples collected over three seasons in night-day series in Croker Passage. The investigations showed that the two species begin reproducing in different seasons. Regardless of season, the growth of M. pygmaeus is more advanced than that of C. citer. Both species are characterised by a separation of their populations in the water column. The youngest copepodite stages (I–III) inhabit the upper portion of the water in which the given species occurs, while the oldest specimens, especially males, inhabit the deepest waters. Additionally, the first growth phases (CI–CIII) show a tendency to concentrate closer to the surface at night.
Źródło:
Oceanologia; 2000, 42, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new predatory cladoceran Cercopagis (Cercopagis) pengoi (Ostroumov 1891) in the Gulf of Gdańsk
Autorzy:
Bielecka, L.
Zmijewska, M.I.
Szymborska, A.
Powiązania:
https://bibliotekanauki.pl/articles/48376.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Cercopagidae
water temperature
crustacean
plankton
Caspian Sea
Baltic Sea
zooplankton
water body
Finland Gulf
new species
Riga Gulf
Gdansk Gulf
Podonidae
Cercopagis pengoi
Opis:
Cercopagis pengoi, a species native to the Ponto-Caspian area, was recorded for the first time in the Baltic Sea in the Gulf of Riga and in the open Gulf of Finland in 1992. Sampling in the shallow coastal area of the western part of the Gulf of Gdańsk at weekly intervals between April 1999 and April 2000 revealed the presence of C. pengoi in the zooplankton community. The species was recorded twice, at densities of 1369 indiv. m−3 on 30 July 1999 and 421 indiv. m−3 on 5 August 1999, when the water temperature was at its maximum, in excess of 21.7◦C and 23.9◦C respectively. C. pengoi had never been recorded in the Gulf of Gdańsk prior to 1999.
Źródło:
Oceanologia; 2000, 42, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative FE-studies of interface behavior of granular Cosserat materials under constant pressure and constant volume conditions
Autorzy:
Ebrahimian, B.
Alsaleh, M. I.
Kahbasi, A.
Powiązania:
https://bibliotekanauki.pl/articles/38629565.pdf
Data publikacji:
2021
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
interface shearing
wall roughness
constant pressure
constant volume
dilatancy constraint
Cosserat FE model
discrete element method (DEM)
Opis:
This article shows the outcomes of a systematic series of finite element (FE) calculations relevant to the shear behavior of a particulate-continuum interface system under different normal boundary conditions. In this respect, shearing of a thin and long granular Cosserat layer in the vicinity of a rigid moving wall with varied surface roughness values is analyzed under constant normal pressure and constant volume conditions. The material behavior is defined with a special elasto-plastic Cosserat model, taking into account micro-rotation, micro-curvature, couple stress, and mean particle size. The interaction between the layer of boundary particles and the surface roughness of the adjoining bottom wall is modeled by the rotation resistance of particles along the wall surface. Herein, the coupled effects of normal confining constraints imposed on the layer and the surface roughness of the bottom wall, are considered on the response of granular material under shearing. The influences of pressure level and initial void ratio are explored as well. Numerical results demonstrate that the dilatancy constraint prescribed to the interface plane in the normal direction, and the wall roughness have visible influences on the interface shear resistance as well as the deformation field formed within the layer. After large shearing, the width of the localized zone along the wall does not necessarily depend on the normal confining constraint and the applied pressure level. However, the localized zone characteristics and the interface shear response are mainly affected by the initial void ratio of the material. In addition to FE analyses, DEM-based simulations are also performed to investigate the micro-mechanical response of granular medium adjacent to a wall under shearing. FE predictions are qualitatively compared with DEM results, and reasonable agreement is observed.
Źródło:
Archives of Mechanics; 2021, 73, 5-6; 421-470
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The relationship between emotional state and the consumption of foods rich in carbohydrates by young adults
Związek między stanem emocjonalnym a konsumpcją produktów bogatych w węglowodany przez młodych dorosłych
Autorzy:
Jaworski, M.
Szatańska, M.I.
Sawicka, S.
Powiązania:
https://bibliotekanauki.pl/articles/2052603.pdf
Data publikacji:
2016
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
emotional state
nutrition
emotions
obesity
simple sugars
chocolate
glycogen
carbohydrates
stan afektywny
żywienie
emocje
otyłość
cukry proste
czekolada
Opis:
Background. High intake of carbohydrates, especially simple sugars, by young adults is associated with the consumption of highly processed foods. This leads to the development of overweight, obesity and various somatic diseases. Identification of factors contributing to the increased consumption of this product group is a very important area of research in the field of public health. Emotional state may be one of such factors. This research aims at analyzing the relationship between consumption of selected groups of foods rich in carbohydrates and actual affective states on the one hand, and relatively constant emotional features on the other hand, in case of young adults. Material and methods. The study was conducted among 120 young adults aged between 18 and to 38 years old. The questionnaire research method, combined with prospective evaluation of diets technique, was used in the study. Two research instruments were used in the research: the scale of positive and negative feelings and food intake frequency questionnaire FQQ. Results. Our research confirmed the relationship between both affective state and relatively constant emotional features with consumption of selected products groups containing carbohydrates, especially simple sugars and glycogen, both in case of women and men. The said relationship has been demonstrated both in case of positive and negative emotions. The study did not confirm the relationship between affective state and consumption of chocolate. Conclusions. The observed relations can be used in the prevention of first degree, taking into account gender differences. It can also be used in potential therapeutic interactions, especially in the field of proper nutrition.
Wprowadzenie. Wysokie spożycie cukrów prostych przez młodych dorosłych związane jest z konsumpcją wysoko przetworzonej żywności. Prowadzi to do rozwoju nadwagi i otyłości oraz licznych chorób somatycznych. Identyfikacja czynników przyczyniających się do zwiększonej konsumpcji tej grupy produktów stanowi bardzo ważny obszar badań z zakresu zdrowia publicznego. Jednym z takich czynników może być stan afektywny jednostki. Celem pracy jest analiza związku między konsumpcją wybranych grup produktów spożywczych bogatych w cukry proste i aktualnymi stanami afektywnymi z jednej strony, oraz względnie stałymi cechami afektywnymi jednostki z drugiej strony przez młodych dorosłych. Materiał i metody. Badanie zostało przeprowadzone wśród 120 młodych dorosłych w wieku od 18 do 40 lat. W badaniu zastosowano metodę badań kwestionariuszowych połączoną z prospektywną techniką oceny sposobu odżywiania się. Zastosowano dwa narzędzia badawcze: skalę uczuć pozytywnych i negatywnych SUPIN oraz kwestionariusz częstotliwości spożycia żywności FQQ. Wyniki. Wyniki badań potwierdziły związek między zarówno aktualnym stanem afektywnym, jak i względnie stałymi cechami afektywnymi, a konsumpcją wybranych grup produktów zawierających cukry proste w przypadku kobiet jak i mężczyzn. Omawianą zależność wykazano zarówno w przypadku emocji pozytywnych, jak i negatywnych. Badania nie potwierdziły związku między stanem afektywnym a konsumpcją czekolady. Wnioski. Wykazane zależności mogą mieć zastosowanie w profilaktyce pierwszego stopnia po uwzględnieniu różnic płciowych. Mogą być także wykorzystane w potencjalnych oddziaływaniach terapeutycznych, zwłaszcza z zakresu prawidłowego odżywiania się.
Źródło:
Health Problems of Civilization; 2016, 10, 2; 10-19
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł

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