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Wyszukujesz frazę "duc." wg kryterium: Wszystkie pola


Wyświetlanie 1-93 z 93
Tytuł:
Viollet-le-Duc, architekt-konserwator i jego związki z Polską
VIOLLET-LE-DUC, ARCHITECTE-RESTAURATEUR DES MONUMENTS HISTORIQUES ET SES RELATIONS AVEC LA POLOGNE
Autorzy:
Jakimowicz, Teresa
Powiązania:
https://bibliotekanauki.pl/articles/537284.pdf
Data publikacji:
1966
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
Eugèn Viollet-le-Duc
wystawa „Viollet-le-Duc 1814—1879”
kościół La Madeleine
pojęcie restauracji zabytków
zamek w Gołuchowie
Opis:
Les problèmes de la conservation s ’imposant de plus en plus après la seconde guerre mondiale, le développement des connaissances théoriques de l’histoire de l’art et l ’épanouissement de l’architecture contemporaine ont attiré l’attention des historiens d ’art et d’architecture sur Viollet-le-Duc — créateur des bases scientifiques dans le domaine de la restauration des monuments historiques et de l’archéologie moderne et précurseur du constructionisme. L’exposition „Viollet-le-Duc 1814—1879” organisée à Paris au printemps de 1965 par la Direction de l ’Architecture constitue le point de départ à la future étude critique sur l’oeuvre de Viollet-le-Duc. L’auteur du scénario et du catalogue de cette exposition est Pierre-Marie Auzas, inspecteur principal des Monuments historiques en France. L’exposition se base principalement sur les riches archives de la famille de Viollet-le-Duc (Fonds Viollet-le-Duc pour la première fois mis à la portée des chercheurs et élaborés dans leur ensemble. L’exposition fournit une documentation complète de multiples activités de Viollet-le-Duc. Voilà leurs aspects principaux: les grandes restaurations, son activité de constructeur et de décorateur, d’écrivain et de pédagogue, le rôle qu’il a joué auprès de la Cour Impériale et du Conseil municipal, influence de son oeuvre sur l ’architecture de divers pays de l’Europe et des Etats-Unis. Chacun de ces problèmes a une documentation sous forme de dessins originaux, de projets, d’inventaires de plans de réalisation, de registres des travaux de construction, de notices historiques, de correspondance et d’objets- souvenirs. Le catalogue dont s ’accompagne l’exposition constitue en même temps la chronique de la vie et de l’oeuvre de Viollet-le Duc. Pour nous le plus essentiel c’est l’aspect qui illustre son travail de conservateur. La doctrine communément connue de Viollet-le-Duc formulée dans l’article „La Restauration” dans le „Dictionnaire Raisonné de l’Architecture” relève d’une pratique de plus de vingt années de son travail assidu, d’architecte des monuments historiques, d ’archéologue, de constructeur et de théoricien. Les mêmes expériences lui ont permis de créer la théorie de ,,1’architecture raisonnée” et le „rationnalisme médiéval” et d ’elaborer les méthodes de l’analyse dans le domaine de l’architecture qui justifient pleinement le nom qui lui fut octroyé de „père de l’archéologie moderne”. La plus intéressante réalisation de l’exposition du point de vue des conservateurs semble être l’atelier de travail de Viollet-le-Duc. Ces méthodes sont proches, malgré différences des moyens de celles de l’atelier de conservation contemporain. L’exposition permet d’apporter une correcte aux opinions qui existaient jusqu’à ce jour sur les rejaillissements de l’art de Viollet-le-Duc en Pologne. Les documents français ne confirment point la tradition polonaise peu claire du voyage de Viollet-le- -Duc à Cracovie et à Gołuchów en 1875. Il s ’avéra que ce voyage a été effectué par le disciple et en même temps le gendre du célèbre architecte Maurice- Auguste Ouradou. Néanmoins, on peut lier quelques réalisations en Pologne à l’activité de Viollet- -le-Duc. Elles furent effectuées grâce au mécénat du prince Vladislas Czartoryski et de sa soeur la comtesse Isabelle Działyńska. Ce sont notamment: en 1860 — le projet de l’école polonaise, Bd Montparnasse, à Paris. Aux environs de 1870, les projets de la restauration du château de Gołuchów —· malheureusement disparus. Leur existence et le fait qu’ils ont été l’oeuvre de Viollet-le-Duc, est confirmé par les archives de 1871/74 (lettre de Działyński). En 1876 — projet du maître-autel néoroman dans la crypte St. Léonard dans la cathédrale de Wawel à Craoovie. Viollet-le-Duc donne des consultations sur les problèmes de la restauration du château de Gołuchów et de la transformation du Collège des Piaristes en Musée Czartoryski à Cracovie. Les projets pour les deux bâtiments précités ont été exécutés par Maurice Ouradou. Le château Renaissance de Gołuchów a été restauré entre 1875 et 1885 dans le sty le François Ier. Le Musée Czartoryski pris la forme du néo-gothique français (1875—84). Ces deux réalisations n’avaient aucun rapport avec l’architecture polonaise et n’ont aucun ascendant sur la conservation des monuments en Pologne ni même sur l’architecture polonaise de la fin du XIXe siècle. Par contre, le problème s’impose de l’influençe de la doctrine de Viollet-le-Duc sur la restauration des monuments historiques en Pologne. La restauration des monuments historiques depuis la 3ème décennie du XIXe siècle est devenu un problème aussi lancinant en Pologne (surtout à Cracovie) qu’en France. Toutefois, il lui manquait la base scientifique et les architectes de monuments historiques en Pologne ont longtemps procédé dans l’esprit d’un patriotisme empreint de romantisme. Néanmoins, dès la moitié du XIXe siècle, se précise à Cracovie la notion de la différence entre la restauration et la conservation des monuments historiques tout en estimant hautement cette dernière. Le „Dictionnaire de l’Architecture” était aussi très connu des architectes polonais. Néanmoins, ce n ’est qu’en 1881 qu’il est possible d ’observer une influence directe de l’idée présentée dans l’article „La Restauration” et ceci dans le programme formulé par W. Luszczkiewicz de la reconstruction de la Cathédrale du Wawel à Cracovie. Les directives de Viollet- le-Duc sont complétées par Luszczkiewicz par le postuilat de lui garder une „ambiance poétique”. De quelque façon que nous jugions dans la perspective du siècle écoulé, la doctrine de Viollet-le- -Duc il faut toujours convenir que son importance consiste non seulement au fait qu’elle fut la première théorie scientifique concernant la restauration des monuments historiques. Une acquisition durable et toujours actuelle de Viollet-le-Duc est le fait d’avoir exigé la compétence et la probité de l’atelier de conservation. Il fut le premier à formuler cette motion et à la réaliser avec conséquence dans sa pratique.
Źródło:
Ochrona Zabytków; 1966, 3; 3-12
0029-8247
Pojawia się w:
Ochrona Zabytków
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sacrum we współczesnej poezji łemkowskiej
Autorzy:
Duć-Fajfer, Helena
Powiązania:
https://bibliotekanauki.pl/articles/1964588.pdf
Data publikacji:
1993
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Opis:
Kolejne rozdziały niniejszego artykułu przedstawiają cztery różne formy przejawiania się sacrum we współczesnej poezji łemkowskiej. Na pierwszy rzut oka wydawać by się mogło, że mamy tu do czynienia z całkiem odmiennym pojmowaniem wartości sakralnych. W istocie jednakże okazuje się, że pojęcie Boga (zawsze pisane z dużej litery) jest jedno, różne są tylko postaci Jego objawienia i formy oddawania Mu czci przez twórców. Czy Bóg, jako byt doskonały, objawia się w pięknie i mądrości natury, czy przemawia biblijnymi imionami, czy też widziany jest w kulturowym aspekcie rodzimej religii, zależne jest tylko od poetyckiej wyobraźni. Tak znamienne dla omawianej poezji widzenie sacrum poprzez pryzmat ojczystej kultury świadczy o dużym zaangażowaniu twórców w ochranianie tejże kultury w aktualnej trudnej sytuacji Łemków. Jest przejawem głębokiego patriotyzmu i najwyższego stopnia akceptacji rodzimych tradycji. Poezja ta bowiem, wyrosła na kanwie zagrożenia całkowitą asymilacją współczesnej kultury łemkowskiej, w sposób szczególny pragnie wypełniać swą patriotyczną misję traktowaną w kategoriach „świętej powinności”. Proces „sakralizowania łemkowskości” i „łemkizowania sacrum”, jaki wyraźnie zaznacza się w najnowszej poezji łemkowskiej, to wynik ścisłego związku tradycyjnej kultury Łemków, jaką chcą ochraniać współcześni twórcy, z wartościami religijnymi. Nie sposób odwołać się do tradycji łemkowskiej z pominięciem cerkwi, ikon, obrzędów religijnych, tak jak i nie sposób mówić po łemkowsku o wartościach sakralnych, nie wyzwalając odpowiednich asocjacji kulturowych. Poezja zaangażowana w najbardziej aktualne problemy społeczne, jaką jest współczesna poezja łemkowska, nigdy nie pozostaje obojętna wobec tego, co zwykle odnosi się do sfery sakralnej.
Źródło:
Roczniki Humanistyczne; 1993, 41, 7; 235-260
0035-7707
Pojawia się w:
Roczniki Humanistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Główne nurty współczesnej poezji łemkowskiej
Главные направления современной лемковской поэзии
Autorzy:
Duć-Fajfer, Helena
Powiązania:
https://bibliotekanauki.pl/articles/1964377.pdf
Data publikacji:
1994
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Opis:
Настоящая статья представляет собой сокращенную версию анализа трех главных направлений в поэзии лемков, проведенного в дипломной работе Литературная жизнь лемков в Польше после второй мировой войны. Народное направление.Сюда причислены поэты, творчество которых обнаруживает наиболее тесные связи с фольклором, независимо от возможного дистанцирования поэта от народного источника. Среди них оказались например: Иван Русенко, Семан Мадзелян, Мыкола Буряк, Иван Горощак, Яков Дудра. Их стихотворения отличаются простыми, регулярными, зачастую схематичными лексико-композиционными укладами. Самые многочисленные произведения, стоящие на грани эпики и лирики. В тематическом плане преобладают патриотический и морализаторский мотивы. Направление тоски по утраченному.Это направление обозначается творчеством трех авторов: Ивана Желема, Ивана Головчака и Мелании Собын. Они сформировали в современной лемковской поэзии некоторую общую модель лиризма, строящуюся на чувстве тоски, печали, любви к утраченной родной земле. Их творчество отличается индивидуальностью, активным поиском новых форм художественной выразительности, бесспорным новаторством для поэзии лемков. Направление автодемонстрации.Речь идет главным образом о творчестве Петра Мурянко, Павла Стефановского, Владислава Грабана, Стефании Трохановской, Хелены Дуць, выпускаемом в двуязычной, польско-лемковской версии. Следовательно, они стараются сохранить ценности культуры лемков не путем изоляции, а выхода с самыми всеобщими из них на более широкий круг получателей. Показывая мир лемков во всех трех временных измерениях, поэты особо подчеркивают его право на будущее. Представленные поэтические направления показывают некоторую эволюцию в сфере формы, содержания и отношения к окружающему миру, какая наблюдается в лемковской поэзии послевоенного времени.
Źródło:
Roczniki Humanistyczne; 1994, 42, 7; 185-200
0035-7707
Pojawia się w:
Roczniki Humanistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remark on hyperbolic embeddability of relatively compact subspaces of complex spaces
Autorzy:
Thai, Do Duc
Powiązania:
https://bibliotekanauki.pl/articles/716776.pdf
Data publikacji:
1991
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
 Abstract. The characterization of hyperbolic embeddability of relatively compact subspaces of a complex space in terms of extension of holomorphic maps from the punctured disc and of limit complex lines is given.
Źródło:
Annales Polonici Mathematici; 1991, 54, 1; 9-11
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
„[Z]a wcześnie dos„[Z]a wcześnie doszliśmy/ do brzegów poznania” – językowa kreacja drogi w tomiku Po obu stronach słowa Oleny Duć-Fajferzliśmy/ do brzegów poznania” – językowa kreacja drogi w tomiku Po obu stronach słowa Oleny Duć-Fajfer
[Z]a wcześnie doszliśmy / do brzegów poznania [Too soon, we reached / the edges of cognition] – linguistic creation of the road in the poems from Po obu stronach słowa [On both sides of the word] by Olena Duć-Fajfer
Autorzy:
Rychter, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1044587.pdf
Data publikacji:
2019-09-15
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
idiolect
Olena Duć-Fajfer
road
Opis:
The image of the road and wandering is a recurring theme in the poems collected in the volume Po obu stronach słowa [On both sides of the word] by Olena Duć-Fajfer. Road is a symbolic and ambiguous component of space experienced by the Lemko people, which is depicted by the use of the noun droga [road] and its synonyms ścieżka [path] and labirynt [maze] as well as adverbs blisko [near] and daleko [far], and pronouns tam [there]. The author uses a number of verbal forms (verbs and participles). As regards the cultural experience of space, one may say that Olena Duć-Fajfer considers Lemkivshchyna to be the centre of the world, a sacred place. For her, each Lemko is on its periphery, in the profane, and spends his or her life trying to reach the centre. The Lemkos can be compared to the pilgrims of the Romantic era, as they searched for their nineteenth-century homeland while in exile; they missed their homeland in terms of both geography (space) and spirituality (culture and symbolism).
Źródło:
Poznańskie Studia Polonistyczne. Seria Językoznawcza; 2019, 26, 1; 157-170
1233-8672
2450-4939
Pojawia się w:
Poznańskie Studia Polonistyczne. Seria Językoznawcza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Raw Water Quality Assessment for Improvement Plan at Thu Duc Water Treatment Plant, Vietnam
Ocena jakości wody surowej na potrzeby planu poprawy w stacji uzdatniania wody Thu Duc w Wietnamie
Autorzy:
Ho, Ngo Anh Dao
Nguyen, Thi Minh Trang
Nguyen, Thi Trang Trung Nghia
Ngo, Minh Khoi
Powiązania:
https://bibliotekanauki.pl/articles/2172072.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
water intake
monitoring
run-off flow
organic matter
water treatment process
Thu Duc Water Treatment Plant
Vietnam
pobór wody
odpływ
materia organiczna
proces uzdatniania wody
zakład uzdatniania wody Thu Duc (miasto Ho Chi Minh, Wietnam)
Opis:
A conventional water treatment process is currently operated at Thu Duc Water Treatment Plant (TDWTP, Ho Chi Minh City, Vietnam) in which raw water is collected from Dong Nai River at Hoa An water intake and pumping station. The raw water quality is currently fluctuated due to the effects of run-off flows which has been increasing recently. This issue directly affects the operation and performance of existing treatment process at TDWTP since the current treatment are all based on traditional technologies and have been operating for a long time. This study is conducted to evaluate the quality of raw water collected at Hoa An intake station during the period of 2018–2020 with the aim to support the consideration of improvement and enhance the operation efficiency at TDWTP. The raw water quality is evaluated by investigating physico-chemical and biological parameters during the 36 months monitoring. This helps to produce a feasible and reliable results which may then can be used as a scientific database for the improvement plan at TDWTP. Results show that the changes of water quality during the investigated time is so complicated, and the concentration of most monitoring parameters is highly seasonal fluctuated. Specifically, the amounts of organic matters, microorganism, nitrogen compounds (NH4 +, NO2 - , NO3 - ) tend to increase strongly, which may be due to the urbanization and industrialization. The management of run-off flows on upstream of water intake and pumping station is also an important aspect which need to be considered to prevent the diffusion and spread of pollution. In addition, the effects of climate changes are the important reason which leads to the seasonal changes of flow and water quality. These issues cause a big challenge for TDWTP to maintain the treatment efficiency and overall performance. This study also proposes several management and technical solutions to address the changes of raw water quality in the future, which may be useful for TDWTP during their consideration to improve the treatment process.
Konwencjonalny proces uzdatniania wody jest obecnie prowadzony w zakładzie uzdatniania wody Thu Duc (TDWTP, miasto Ho Chi Minh, Wietnam), w którym surowa woda jest pobierana z rzeki Dong Nai i z przepompowni Hoa An. Jakość wody surowej podlega obecnie wahaniom ze względu na skutki spływów, które ostatnio nasilają się. Kwestia ta ma bezpośredni wpływ na funkcjonowanie i wydajność istniejących procesów oczyszczania w TDWTP, gdyż wszystkie obecne działające oczyszczalnie oparte są na tradycyjnych technologiach i działają od dłuższego czasu. Niniejsze badanie ma na celu ocenę jakości wody surowej pobieranej ze stacji poboru Hoa An w latach 2018–2020 w celu wsparcia rozważań nad poprawą i zwiększeniem efektywności działania TDWTP. Jakość wody surowej oceniana jest poprzez badanie parametrów fizykochemicznych i biologicznych podczas 36-miesięcznego monitoringu. Pozwoliłó to uzyskanie wiarygodnych wyników, które następnie mogą być wykorzystane jako naukowa baza danych dla planu modernizacji TDWTP. Wyniki pokazują, że zmiany jakości wody w badanym okresie są bardzo złożone, a stężenia większości parametrów monitoringu podlegają dużym wahaniom sezonowym. Szczególnie silnie wzrastają ilości materii organicznej, mikroorganizmów, związków azotu (NH4 +, NO2 - , NO3 - ), co może być spowodowane urbanizacją i uprzemysłowieniem. Ważnym aspektem, który należy wziąć pod uwagę, aby zapobiec rozprzestrzenianiu się zanieczyszczeń, jest również zarządzanie przepływami odpływowymi przed ujęciem wody i przepompownią. Ponadto skutki zmian klimatu są ważną przyczyną sezonowych zmian przepływu i jakości wody. Kwestie te stanowią duże wyzwanie dla TDWTP, aby utrzymać skuteczność oczyszczania i ogólną wydajność. W niniejszym opracowaniu zaproponowano również kilka rozwiązań w zakresie zarządzania i rozwiązań technicznych mających na celu zajęcie się zmianami jakości wody surowej w przyszłości, które mogą być przydatne dla TDWTP podczas rozważań nad poprawą procesu oczyszczania.
Źródło:
Inżynieria Mineralna; 2022, 2; 135--140
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Melting and the Debye Temperature of for BCC and FCC Metals Under Pressure: A Calculation from the Statistical Moment Method
Autorzy:
Hoc, Nguyen Quang
Tinh, Bui Duc
Hien, Nguyen Duc
Powiązania:
https://bibliotekanauki.pl/articles/2174555.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
statistical moment method
defective cubic metals
perfect cubic metals
Debye temperature
Opis:
We build the melting theory and the theory of the Debye temperature for defective and perfect cubic metals mainly based on the statistical moment method. Our theoretical results are applied to metals Ni, Pd and Pt. Our calculations of melting temperatures agree well with experiments and other calculations. Our other calculations are highly reliable.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1227--1234
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Understanding Saltwater Origins and Mechanisms in the Coastal Aquifers of Da Nang Area (Central Vietnam)
Autorzy:
Nguyen, Thao Bach
Duc, Nhan Dang
Dao, Bang Duc
Powiązania:
https://bibliotekanauki.pl/articles/27323254.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
saltwater intrusion
groundwater modeling
sustainable groundwater development
coastal aquifers
surface water interaction,
water resource management
wody podziemne
zarządzanie
Wietnam
Opis:
Saltwater intrusion in the rapidly developing city of Da Nang in central Vietnam is currently causing various water-related challenges, including inadequate water supply and water pollution. An integrated SWAT-MODFLOW numerical model was used to investigate the origin and mechanism of saltwater in Holocene and Pleistocene aquifers. Geophysical and isotopic approaches were used to validate the SEAWAT model applied for simulating saltwater intrusion. The results suggest that the ebb and flow of tides, as well as water levels in rivers primarily impact coastal aquifers. However, effective water resource planning and management, along with maintaining the natural recharge of fresh water from local rain during the rainy season, could enable the rational and efficient utilization of groundwater, reducing saltwater intrusion in many areas. During the dry season, groundwater is recharged from higher altitude areas. The current saltwater intrusion mainly occurs along the rivers up to the hydraulic dam. Simulated models, using scenarios of stop abstracting groundwater, but changing to the use of surface water for drinking water, show that the area of saline water shrinks quickly after 30 years, reducing from 59.6 km2 to 39.5 km2 and from 40.2 km2 to 28.6 km2 in the Holocene and Pleistocene, respectively.
Źródło:
Inżynieria Mineralna; 2023, 2; 281--288
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zero Defect Manufacturing Using Digital Numerical Control
Autorzy:
Ly Duc, Minh
Bilik, Peter
Powiązania:
https://bibliotekanauki.pl/articles/2172178.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
digital numerical control
Taguchi
ANOVA
Lean Six Sigma
Opis:
This paper proposes the application of the digital numerical control (DNC) technique to connect the smart meter to the inspection system and evaluate the total harmonic distortion (THD) value of power supply voltage in IEEE 519 standard by measuring the system. Experimental design by the Taguchi method is proposed to evaluate the compatibility factors to choose Urethane material as an alternative to SS400 material for roller fabrication at the machining center. Computer vision uses artificial intelligence (AI) technique to identify object iron color in distinguishing black for urethane material and white for SS400 material, color recognition results are evaluated by measuring system, system measurement is locked when the object of identification is white material SS400. Computer vision using AI technology is also used to recognize facial objects and control the layout of machining staff positions according to their respective skills. The results obtained after the study are that the surface scratches in the machining center are reduced from 100% to zero defects and the surface polishing process is eliminated, shortening production lead time, and reducing 2 employees. The total operating cost of the processing line decreased by 5785 USD per year. Minitab 18.0 software uses statistical model analysis, experimental design, and Taguchi technical analysis to evaluate the process and experimentally convert materials for roller production. MATLAB 2022a runs a computer vision model using artificial intelligence (AI) to recognize color objects to classify Urethane and SS400 materials and recognize the faces of people who control employee layout positions according to their respective skills.
Źródło:
Management and Production Engineering Review; 2022, 13, 3; 61--74
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radon-Radium Thermal Mineral Water in Vo Am Ecotourism Project Area, Ngoc Luong Commune, Yen Thuy District, Hoa Binh Province, Vietnam
Autorzy:
Ban, To Xuan
Dung, Le Tien
Duc, Tran Van
Trong, Nguyen Huu
Tuan, Truong Duc
Powiązania:
https://bibliotekanauki.pl/articles/27323255.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
thermal mineral water
Ngoc Luong
Hoa Binh
Vietnam
wody termalne
wody mineralne
Wietnam
Opis:
Ngoc Luong thermal mineral water at Vo Am ecotoursim, Ngoc Luong commnune, Yen Thuy district, Hoa Binh province, northern Vietnam. The thermal mineral water source is at karstic-fractured limstones of Dong Giao Formation aged Anisi. Methods used in this study conists of basic field survey of hydrogeology, resistivity, borehole drilling, pumping tests, and thermal mineral water sample analysis. The thermal mineral water is classified as radon-radium, low mineralised thermal mineral water. The water source is originally related to the deep Moc Chau-Tam Diep Fault directing northwest-southeastward. Its exploration reserve is estimated at 1,497 m3/d with good quality, sastifying all national criterals for the use of domestic supply, bathing, and medical treatment. This is one of ten rare thermal-mineral water sources in Vietnam, containing radon and radium. It is thefore necessary to have good management to ensure the thermal-mineral water to be effectively exploited, used, and protected.
Źródło:
Inżynieria Mineralna; 2023, 2; 327--333
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The development of an underwater telephone for digital communication purposes
Autorzy:
Schmidt, J.
Powiązania:
https://bibliotekanauki.pl/articles/331641.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
digital signal processor
spread spectrum
DDC
DUC
STANAG 1074/1475
Opis:
The underwater telephone HTL-10 has been designed to provide voice and data communication between helicopter and submarines using acoustic waves. It works in a halfduplex mode and uses analogue power-efficient modulation in the form of a single side-band, suppressed carrier, in a wide range of frequencies. It generates the transmitted signal, and processes the received signals. It is implemented with the use of digital signal processing techniques. Although it was designed several years ago, the flexible structure of the underwater telephone ensures a convenient platform for the implementation of various types of communication, as well as testing. This ability is due to the particular characteristics of the digital signal-processing module, which was designed by the author, both in hardware and software. The main elements of the module consist of the fixed-point signal processor, and the floating-point high performance digital signal processor. The article demonstrates the ability to adapt HTL-10 to implement digital communication in shallow waters, with a robust low data rate spread spectrum approach.
Źródło:
Hydroacoustics; 2016, 19; 341-352
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Słowianie wschodni a europejskie tradycje kulturowe, pod red. H. Duć-Fajfer i J. Kuffla, Kraków: „Księgarnia Akademicka” 2019, 240 s., z ilustracjami.
Autorzy:
Szczukin, Wasilij
Powiązania:
https://bibliotekanauki.pl/articles/2031451.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Slavia Orientalis; 2020, LXIX, 2; 411-416
0037-6744
Pojawia się w:
Slavia Orientalis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Historia i sytuacja języka łemkowskiego w ostatnim stuleciu
Autorzy:
Duć-Fajfer, Helena
Powiązania:
https://bibliotekanauki.pl/articles/2152115.pdf
Data publikacji:
2021-09
Wydawca:
Towarzystwo Kultury Języka
Tematy:
Lemko language
Lemko language teaching
linguistic identity
linguistic awareness
language revitalisation
endangered language
Opis:
The aim of this paper is to briefl y present the situation of the Lemko language from the historical perspective covering one hundred years of its development. The creation of Lemkos’ linguistic awareness and identity before their displacements (1945–1947) has been clearly refl ected in literature. It provides the foundation for reconstructing the main emancipatory identity line developed based on “our language”, equivalent to the local speech, followed by the Lemko intelligentsia, while confronting the social and political considerations of their native area. A drastic effect of the considerations was displacements, destruction of culture, and lack of conditions for fostering language. The recovery of language rights after 1989 has initiated a range of internal revitalisation processes and strategies supported also institutionally. They are, however, not able to stop the mass destructive processes resulting in the Lemko language being currently among the endangered ones.
Źródło:
Poradnik Językowy; 2021, 786, 7; 46-66
0551-5343
Pojawia się w:
Poradnik Językowy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling labor productivity in high-rise building construction projects using neural networks
Autorzy:
Nguyen, Duc Anh
Tran, Dung Quang
Nguyen, Thoan Ngoc
Tran, Hai Hong
Powiązania:
https://bibliotekanauki.pl/articles/2203438.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Labor productivity in building construction has long been a focused research topic due to the high contribution of labor cost in the building total costs. This study, among a few studies that used scaled data that were collected directly from measuring equipment and onsite activities, utilized neural networks to model the productivity of two main construction tasks and influencing factors. The neural networks show their ability to predict the behaviors of labor productivity of the formwork and rebar tasks in a test case of a high-rise building. A multilayer perceptron that had two layers and used sigmoid as its activation function provided the best effectiveness in predicting the relations among data. Among eleven independent factors, weather (e.g., temperature, precipitation, sun) generally played the most important role while crew factors were distributed in the mid of the ranking and the site factor (working floor height) played a mild role. This study confirms the robustness of neural networks in productivity research problems and the importance of working environments to labor productivity in building construction. Managerial implications, including careful environmental factors and crew structure deliberation, evolved from the study when labor productivity improvement is considered.
Źródło:
Archives of Civil Engineering; 2023, 69, 1; 675--692
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of TOPSIS and PIV methods for multi-criteria decision making in hard turning process
Autorzy:
Trung, Do Duc
Powiązania:
https://bibliotekanauki.pl/articles/2052202.pdf
Data publikacji:
2021
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
multi-criteria decision making
TOPSIS
PIV
weight
Opis:
In this study, TOPSIS and PIV methods were applied for multi-criteria decision making in hard turning process. Experiments have been conducted in accordance with an experimental matrix designed by the Taguchi method with a total of twenty-seven experiments. At each experiment, the values of coolant concentration, nose radius, coolant flow, cutting velocity, feed rate and depth of cut have been changed. Surface roughness, flank wear and roundness error have been selected as output criteria. The weights of criteria have been determined by three methods, inclusive of Equal weight, ROC weight and Entropy weight. The combination of multi-criteria decision-making methods with three weighting methods gives six ranking options of the experiments. The purpose of ranking the experiments is to find the experiment at which the three output parameters are ensured to have the minimum value simultaneously.
Źródło:
Journal of Machine Engineering; 2021, 21, 4; 57-71
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enabling Power Beacons and Wireless Power Transfers for Non-Orthogonal Multiple Access Networks
Autorzy:
Le, Chi-Bao
Nguyen, Nhan Duc
Powiązania:
https://bibliotekanauki.pl/articles/1839323.pdf
Data publikacji:
2021
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
ergodic capacity
NOMA
outage probability
power beacon
Opis:
This paper studies downlink cellular networks relying on non-orthogonal multiple access (NOMA). Specifically, the access point (AP) is able to harvest wireless power from the power beacon (PB). In the context of an AP facilitated with multiple antennas, the transmit antenna selection procedure is performed to process the downlink signal, with the transmission guaranteed by energy harvesting. Therefore, a wireless power transfer-based network is introduced to overcome power outages at the AP. In particular, an energy-constrained AP harvests energy from the radio frequency signals transmitted by the PB in order to assist in transmitting user data. Outage performance and ergodic capacity are evaluated with the use of closed-form expressions. In order to highlight some insights, approximate computations are provided. Finally, numerical simulations are performed to confirm the benefits of combining the downlink NOMA transmission and the transmit power scheme at the AP in order to serve a multitude of users.
Źródło:
Journal of Telecommunications and Information Technology; 2021, 3; 1-9
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sprzętowa weryfikacja funkcjonalna magistrali AMBA® AXI
Functional hardware verification of AMBA® AXI bus
Autorzy:
Duc, P.
Powiązania:
https://bibliotekanauki.pl/articles/155275.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
AMBA
AXI
Sce-Mi
sprzętowa weryfikacja funkcjonalna
functional coverage
functional hardware verification
Opis:
W artykule przedstawiono moduł monitora magistrali AMBA® AXI, umożliwiający weryfikację poprawności oraz weryfikację functional coverage protokołu AXI w systemach koemulacji sprzętowo-programowej układów SoC (System-on-Chip). Układ monitora składa się z syntezowalnej części sprzętowej oraz części programowej. Część sprzętowa służy do bezpośredniej obserwacji stanu magistrali i zawiera podstawowe elementy weryfikacyjne, zaś część programowa umożliwia komunikację części sprzętowej z programowym środowiskiem weryfikacyjnym.
The currently observed increase in SoC (System-on-Chip) system complexity determines evolution of the verification methods to ensure complete and as fast as possible verification of the whole system correctness. One of the main direction in development of the complex SoC design verification methodology is implementation of hardware accelerated systems in the verification process. There is a number of ways used in this kind of verification. One is the transaction based hardware-software co-emulation, that support high level software test environment to control and observe the hardware implementation of design under test. This paper presents the AMBA® AXI bus monitor for using in co-emulation systems, with particular attention paid to the Sce-Mi based systems. The monitor architecture has two parts, hardware and software. The synthesizable hardware part is implemented in a programmable device of the emulator system and is used to direct bus observation through basic checkers. The task of the monitor software part is to enable proper configuration of the hardware part, to receive verification status information, to perform more sophisticated checking and to report verification results. Communication between the hardware and software parts is based on exchange of message vectors through a message channel known from the co-emulation Sce-Mi standard.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 8, 8; 966-968
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
International tort law in Vietnam – Taking stock and the case for reform
Autorzy:
Doan, Luong Duc
Nguyen, Trinh Thi Hong
Powiązania:
https://bibliotekanauki.pl/articles/2143011.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Nauk Prawnych PAN
Tematy:
applicable law
conflict of law
place of damage
tort
Vietnam
Źródło:
Polish Yearbook of International Law; 2020, 40; 255-271
0554-498X
Pojawia się w:
Polish Yearbook of International Law
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free vibration analysis of FGM stepped nanostructures using nonlocal dynamic stiffness model
Autorzy:
Lien, Tran Van
Duc, Ngo Trong
Dinh, Tran Binh
Dat, Pham Tuan
Powiązania:
https://bibliotekanauki.pl/articles/2086972.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nonlocal
DSM
FGM
nanostructure
nondimensional frequency
Opis:
A nonlocal Dynamic Stiffness Model (DSM) for free vibration analysis of Functionally Graded Material (FGM) stepped nanostructures based on the Nonlocal Elastic Theory (NET) is proposed. An exact solution to the equation of motion of a nanobeam element according to the Timoshenko beam theory, NET, and taking into account position of the neutral axis is constructed. Nondimensional frequencies and mode shapes of complete FGM stepped nanostructures are easily obtained using the nonlocal DSM. Numerical results are presented to show significance of the material distribution profile, nonlocal effect, and boundary conditions on free vibration of nanostructures.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 2; 279--292
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Community participation for developing rural transport infrastructure in Dong Nai province, Vietnam
Autorzy:
Hai, Dinh Tuan
Quyet, Nguyen Xuan
Nguen, Duc Anh
Powiązania:
https://bibliotekanauki.pl/articles/2098152.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
community
Dong Nai
infrastructure
transport
Vietnam
społeczność
infrastruktura
Wietnam
Opis:
Developing countries are facing sustainability problems in developing rural transport infrastructure; the problems arise from the lack of financial resource and public support. Enhancing community participation promises to resolve these challenges. Demographics has a strong influence on community participation; however, how demographic characteristics interact with community participation has been yet to be focally studied. Dong Nai, a southern province in Vietnam, was selected as the case study owing to its high requirement of rural transport infrastructure. Questionnaires were sent to 438 households. An analysis of data was performed descriptively and with logistic regression. Community participation was recorded as financial, labor, material, and land contribution. Household composition, education, income, and member in household as community leader are among the highest influential factors to community participation. With the importance of community participation, the results of the study benefits both policy makers and local governments in planning, predicting the success of local development programs, and enhancing community participation, which increase the chance of success in rural transport infrastructure.
Źródło:
Transport Problems; 2021, 16, 2; 45--57
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on Apparent Friction Factor in Perforated and Slotted Horizontal Filters to Dewater Opencast Mines Using Numerical Analysis
Badania nad widocznym współczynnikiem tarcia w perforowanych i szczelinowych filtrach poziomych do odwadniania kopalń odkrywkowych przy użyciu analizy numerycznej
Autorzy:
Tran, Duc Huan
Pham, Duc Thien
Powiązania:
https://bibliotekanauki.pl/articles/317962.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
apparent friction factor
perforation roughness
total inflow rate
horizontal filters
dewatering
opencast mines
widoczny współczynnik tarcia
chropowatość perforacji
całkowity napływ
studnie poziome
odwadnianie
kopalnie odkrywkowe
Opis:
In the mining industry, the horizontal wells have been using for dewatering purpose for several years. Due to unique characteristics, those horizontal filters are recommended to balance both the mechanical strength and hydraulic performance. Pressure drop along the horizontal well is one of the essential factors that affect the performance of a wellbore, the dewatering capacity as well. The pressure drop is caused due to four separate factors: wall friction, perforation roughness, inflow acceleration and mixing effects. In this publication, numerical analysis was implemented with different types of perforated and slotted pipes to investigate the effects of two later factors: inflow acceleration and the mixing effects. The simulated data using ANSYS 14.5 was analyzed using universal velocity distribution law in combination with the roughness function and influx flow. The results revealed that the apparent friction factor is a linear function of roughness friction factor and the total inflow rate ratio.
W ostatnich latach, w przemyśle wydobywczym studnie poziome są wykorzystywane do odwadniania. Ze względu na wyjątkowe właściwości te filtry poziome są zalecane, aby zrównoważyć zarówno wytrzymałość mechaniczną, jak i wydajność hydrauliczną. Spadek ciśnienia wzdłuż odwiertu poziomego jest jednym z podstawowych czynników wpływających na wydajność odwiertu, a także wydajność odwadniania. Spadek ciśnienia jest spowodowany czterema odrębnymi czynnikami: tarciem o ścianki, chropowatością perforacji, przyspieszeniem dopływu i efektami mieszania. W niniejszej publikacji zaimplementowano analizę numeryczną różnych typów rur perforowanych i szczelinowych w celu zbadania wpływu dwóch późniejszych czynników: przyspieszenia dopływu i efektu mieszania. Symulowane dane za pomocą oprogramowania ANSYS 14.5 zostały przeanalizowane przy użyciu uniwersalnego prawa rozkładu prędkości w połączeniu z funkcją chropowatości i przepływem napływowym. Wyniki wykazały, że widoczny współczynnik tarcia jest liniową funkcją współczynnika tarcia chropowatości i współczynnika całkowitego napływu.
Źródło:
Inżynieria Mineralna; 2020, 1, 2; 193-199
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Strategy of Tool Path Planning Based on Hydrodynamic Data to Machine Marine Propeller
Autorzy:
Breteau, T.
Damay, T.
Duc, E.
Hascoët, J.-Y.
Powiązania:
https://bibliotekanauki.pl/articles/971234.pdf
Data publikacji:
2009
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
propeller
tool path planning
machining methodology
Opis:
Marine propellers are complex surfaces that are usually machined with a perfect roughness in order not to disturb the theoretical flow. Because this requirement is penalizing from a manufacturing point of view, the global objective of the study is to propose an approach in which the machining parameters are linked to functional properties of the blade in order to remove the polishing phase. To reach this objective, hydrodynamic data are used: streak lines, that are computed during the propeller design phase, characterize the fluid behavior at the close vicinity of the blade. Those lines, which are theoretically continuous at the leading edge, turn out to be discontinuous, due to the computing method. To be consistent with the fluid behavior as much as possible, the idea presented in the paper is to compose a continuous trajectory, especially at the leading edge, to mill the surface. Thus, an algorithm is developed to plan tool paths which are smoothed at leading edge using Bezier curves. Moreover, this algorithm allows to quantify the cusp height at the leading edge to avoid a drop in performance using criteria linked to the dynamical behavior of a five axis machine tool. In this work, a strategy is developed and enables multiaxial milling of a blade surface by using geometric and hydrodynamic data and by respecting the associated constraints.
Źródło:
Journal of Machine Engineering; 2009, 9, 1; 29-40
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Developing the Regression Equations to Determine the Bankfull Discharge from the Basin Characteristics
Autorzy:
Chau, Tran Kim
Toan, Nguyen The
Duc, Do Anh
Linh, Nguyen Ha
Powiązania:
https://bibliotekanauki.pl/articles/2097760.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
bankfull discharge
regression equation
catchment characteristics
Opis:
Bankfull discharge is an important criterion for flash flood warnings. In this study, the authors propose a new approach to determine the bankfull discharge for basins in Ha Giang province, Vietnam. The study combines the field survey to determine the bankfull discharge through the bankfull indicators and develop a multivariate regression equation between the bankfull discharge and the basin characteristics. The results of the study give a simple equation with 2 independent variables. They are the catchment area and the main river length. They show a strong relationship with the bankfull discharge with the R2 indexes in developing and validating process equal to 95.3% and 92.7%, respectively. With this approach, the workload is significantly reduced. However, the accuracy and flexibility of the total discharge calculation are enhanced. This will be the foundation to reduce uncertainty in flash flood warnings.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2021, 68, 2; 103--117
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The combination of Taguchi – Entropy – WASPAS – PIV methods for multi-criteria decision making when external cylindrical grinding of 65G steel
Autorzy:
Trung, Do Duc
Powiązania:
https://bibliotekanauki.pl/articles/2052199.pdf
Data publikacji:
2021
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
external cylindrical grinding
MCDM
WASPAS
PIV
decision making
Opis:
This paper presents a study on the multi-creteria decision making in the external cylindrical grinding process of 65G steel. An aluminum oxide grinding wheel was used in the experimental process. The experimental matrix was designed according to the Taguchi method with twenty-seven experiments. Five parameters were used to design the experimental matrix including workpiece velocity, feed rate, depth of cut, dressing feed rate, and dressing depth of cut. The surface roughness and Material Removal Rate (MRR) were determined for each experiment. This is the first time that the Weighted Aggregates Sum Product ASsessment (WASPAS) and Proximity Indexed Value (PIV) methods were used to make the multi-criteria decision for grinding process. The weighs of ouput criteria (surface roughness and MRR) were determined by Entropy method. Both WASPAS and PIV methods determined an experiment that simultaneously ensured the “minimum value” of surface roughness and “maximum value” of MRR.
Źródło:
Journal of Machine Engineering; 2021, 21, 4; 90-105
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SIoT Framework: Towards an Approach for Early Identification of Security Requirements for Internet-of-things Applications
Autorzy:
Jabangwe, Ronald
Nguyen-Duc, Anh
Powiązania:
https://bibliotekanauki.pl/articles/384191.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
security requirement
Internet-of-things
software engineering
requirement engineering
security framework
Opis:
Background: Security has become more of a concern with the wide deployment of Internet-of-things (IoT) devices. The importance of addressing security risks early in the development lifecycle before pushing to market cannot be over emphasized. Aim: To this end, we propose a conceptual framework to help with identifying security concerns early in the product development lifecycle for Internet-of-things, that we refer to as SIoT (Security for Internet-of-Things). Method: The framework adopts well known security engineering approaches and best practices, and systematically builds on existing research work on IoT architecture. Results: Practitioners at a Norwegian start-up company evaluated the framework and found it useful as a foundation for addressing critical security concerns for IoT applications early in the development lifecycle. The output from using the framework can be a checklist that can be used as input during security requirements engineering activities for IoT applications. Conclusions: However, security is a multi-faced concept; therefore, users of the SIoT framework should not view the framework as a panacea to all security threats. The framework may need to be refined in the future, particularly to improve its completeness to cover various IoT contexts.
Źródło:
e-Informatica Software Engineering Journal; 2020, 14, 1; 77-95
1897-7979
Pojawia się w:
e-Informatica Software Engineering Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computation of electromagnetic forces in the windings of amorphous core transformers
Autorzy:
Thanh, Bao Doan
Tung, Doan Duc
Le, Tuan-Ho
Powiązania:
https://bibliotekanauki.pl/articles/24202732.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
amorphous transformer
electromagnetic force
leakage flux
magnetic vector potential formulation
short-circuit current
Opis:
Electromagnetic forces generated by the short circuit current and leakage flux in low- and high-voltage windings of distribution transformers as well as amorphous core transformers will cause the translation, destruction, and explosion of the windings. Thus, the investigation of these forces plays a significant role for researchers and manufacturers. Many authors have recently used the finite element method to analyze electromagnetic forces. In this paper, an analytic model is first developed for magnetic vector potential formulations to compute the electromagnetic forces (i.e., axial and radial forces) acting on the low- and high-voltage windings of an amorphous core transformer. The finite element technique is then presented to validate the results obtained from the analytical model. The developed model is applied to an actual problem.
Źródło:
Archives of Electrical Engineering; 2023, 72, 2; 521--539
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Congregazione per i Vescovi, Duc in altum. Pellegrinaggio alla Tomba di San Pietro. Incontro di riflessione. Roma. 10-19 settembre 2013, Libreria Editrice Vaticana, Città del Vaticano 2013, ss. 394.
Autorzy:
Dziuba, Andrzej Franciszek
Powiązania:
https://bibliotekanauki.pl/articles/1047755.pdf
Data publikacji:
2014-01-01
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Źródło:
Teologia i moralność; 2014, 9, 2(16); 239-242
1898-2964
2450-4602
Pojawia się w:
Teologia i moralność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Heavy Metal Pollution in the Surface Water of the Doi-Cho Dem-Ben Luc Rivers, Vietnam
Ocena zanieczyszczenia metalami ciężkimi wód powierzchniowych rzek Doi-Cho Dem-Ben Luc w Wietnamie
Autorzy:
Thieu, Van Vu Duc
Dinh, Thi Thu Huong
Nguyen, Thi Truc Thao
Nguyen, Thuy Lan Chi
Nguyen, Binh An
Pham, Anh-Duc
Powiązania:
https://bibliotekanauki.pl/articles/2172069.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
heavy metal pollution
surface water
distribution
river
Doi-Cho Dem-Ben Luc
water quality protection
zanieczyszczenie metalami ciężkimi
wody powierzchniowe
dystrybucja
rzeki
ochrona jakości wód
Opis:
Heavy metals are a pressing concern in terms of their pollution in aquatic ecosystems because of their persistence, environmental toxicity, bioaccumulation. Aquatic environments receive heavy metals in untreated or inadequately treated wastewater from domestic, industrial, agricultural, and navigation sources. The Doi-Cho Dem-Ben Luc Rivers play the key roles of irrigation, navigation and ecological restoration. It is crucial to ascertain the pollution status, influencing factors, ecological risks, and possible sources of heavy metals in the surface water of the Doi-Cho Dem-Ben Luc Rivers. In this study, surface water from 7 sampling sites over was collected from the Doi-Cho Dem-Ben Luc Rivers, over 7 consecutive periods from April 2019 to October 2021. Each surface sample was analyzed for 9 heavy metals including Fe, Mn, Cr, Zn, Cu, Pb, Cd, Ni, As. The sampling technique and sample treatment were done based on the Standard Methods for the Examination of Water and Wastewater. The time and space variation of heavy metal concentrations were examined to test the analysis of variance (ANOVA) and correlation among all the parameters using R statistical software. The results suggest a spatial homogeneity of heavy metals in the surface water the studied rivers. Among all nine examined heavy metals in the studied area, the concentrations of Fe (1.00 ÷ 5.06 mg/L) and Mn (0.14 ÷ 0.28 mg/L) are the highest, and the concentrations of Cr, Cd and As are the lowest that lower limit of detection. The results suggested that the mean concentrations of Fe and Mn were above the acceptable limits of the National technical regulation on surface water quality (QCVN 08-MT: 2015/BTNMT). While the concentrations of Fe, Mn, Zn, Cu, Pb, Ni do not meet the Water quality criteria for aquatic life (United State Environmental Protection Agency). Anthropogenic activities can be the main source of heavy metals in in the surface water of the Doi-Cho Dem-Ben Luc Rivers. Among the heavy metals, a significant positive correlation was observed between Fe, Mn, Zn and Ni (0.64 ÷ 0.87), whereas Cu exhibited a significant positive correlation with Ni (0.51). While Cu and Pb showed a not too strong correlation with Fe, Mn, Zn and Ni (0.25 ÷ 0.48). The distribution of heavy metals may also be influenced by properties of heavy metals and fluctuations in water flows. The results provide guidance for controlling heavry metal pollution and protectting water sources in the Doi-Cho Dem-Ben Luc Rivers.
Metale ciężkie stanowią palący problem zanieczyszczenia w ekosystemach wodnych ze względu na ich trwałość, toksyczność dla środowiska i bioakumulację. Środowiska wodne sa zasilane w metale ciężkie z nieoczyszczonych lub nieodpowiednio oczyszczonych ścieków ze źródeł domowych, przemysłowych, rolniczych i żeglugowych. Rzeki Doi-Cho Dem-Ben Luc odgrywają kluczową rolę w nawadnianiu terenów, transporcie odnym i odbudowie ekologicznej. Kluczowe znaczenie ma ustalenie stanu zanieczyszczenia, czynników wpływających, zagrożeń ekologicznych i możliwych źródeł metali ciężkich w wodach powierzchniowych rzek Doi-Cho Dem-Ben Luc. W artykule przedstawiono wyniki badania wód powierzchniowych, próbki pobrano z 7 punktów pomiarowych z rzek Doi-Cho Dem-Ben Luc przez 7 kolejnych okresów od kwietnia 2019 r. do października 2021 r. Każda próbka została przeanalizowana pod kątem zawartości 9 metali ciężkich: Fe, Mn, Cr , Zn, Cu, Pb, Cd, Ni, As. Metodyka pobierania próbek i obróbki próbek zostały opracowane w oparciu o Standardowe Metody Badania Wód i Ścieków. Zbadano zmienność w czasie i przestrzeni stężeń metali ciężkich, do analizyy wyników wykorzystano analizę wariancji (ANOVA) i korelacji między wszystkimi parametrami przy użyciu oprogramowania statystycznego. Wyniki sugerują przestrzenną jednorodność zawartości metali ciężkich w wodach powierzchniowych badanych rzek. Spośród wszystkich dziewięciu badanych metali ciężkich w badanym terenie najwyższe są stężenia Fe (1,00 ÷ 5,06 mg/L) i Mn (0,14 ÷ 0,28 mg/L), a najniższe Cr, Cd i As (wartości odpowiadające dolnej granicy wykrywalności). Wyniki wskazują, że średnie stężenia Fe i Mn były powyżej dopuszczalnych limitów, opisanych w krajowych normach dotyczących jakości wód powierzchniowych (QCVN 08-MT: 2015/BTNMT). Natomiast stężenia Fe, Mn, Zn, Cu, Pb, Ni nie spełniają kryteriów jakości wody dla organizmów wodnych (Agencja Ochrony Środowiska Stanów Zjednoczonych). Działalność antropogeniczna może być głównym źródłem metali ciężkich w wodach powierzchniowych rzek Doi-Cho Dem-Ben Luc. Wśród metali ciężkich zaobserwowano istotną dodatnią korelację między zawartością Fe, Mn, Zn i Ni (0,64 ÷ 0,87), natomiast Cu wykazywała istotną dodatnią korelację z Ni (0,51). Zawartości Cu i Pb wykazywały niezbyt silną korelację z Fe, Mn, Zn i Ni (0,25 ÷ 0,48). Na rozmieszczenie metali ciężkich mogą mieć również wpływ właściwości metali ciężkich oraz wahania przepływów wody. Wyniki dostarczają wskazówek dotyczących kontrolowania zanieczyszczenia metalami ciężkimi i ochrony źródeł wody w rzekach Doi-Cho Dem-Ben Luc.
Źródło:
Inżynieria Mineralna; 2022, 2; 85--90
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Do Software Firms Collaborate or Compete? A Model of Coopetition in Community-initiated OSS Projects
Autorzy:
Nguyen-Duc, Anh
Cruzes, Daniela S.
Terje, Snarby
Abrahamsson, Pekka
Powiązania:
https://bibliotekanauki.pl/articles/384189.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
COSS
coopetition
collaboration
competition
open source software
case study
Opis:
Background: An increasing number of commercial firms are participating in Open Source Software (OSS) projects to reduce their development cost and increase technical innovativeness. When collaborating with other firms whose sought values are conflicts of interests, firms may behave uncooperatively leading to harmful impacts on the common goal. Aim: This study explores how software firms both collaborate and compete in OSS projects. Method: We adopted a mixed research method on three OSS projects. Result: We found that commercial firms participating in community-initiated OSS projects collaborate in various ways across the organizational boundaries. While most of firms contribute little, a small number of firms that are very active and account for large proportions of contributions. We proposed a conceptual model to explain for coopetition among software firms in OSS projects. The model shows two aspects of coopetition can be managed at the same time based on firm gatekeepers. Conclusion: Firms need to operationalize their coopetition strategies to maximize value gained from participating in OSS projects.
Źródło:
e-Informatica Software Engineering Journal; 2019, 13, 1; 37-62
1897-7979
Pojawia się w:
e-Informatica Software Engineering Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the ankle rehabilitation device
Autorzy:
Dao, Minh Duc
Tran, Xuan Tuy
Pham, Dang Phuoc
Ngo, Quoc Anh
Le, Thi Thuy Tram
Powiązania:
https://bibliotekanauki.pl/articles/2065763.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ankle
rehabilitation
stroke
slide mode controller
linear actuator
kostka
rehabilitacja
udar
siłownik liniowy
Opis:
This study developed an ankle rehabilitation device for post-stroke patients. First, the research models and dynamic equations of the device are addressed. Second, the Sliding Mode Controller for the ankle rehabilitation device is designed, and the device's response is simulated on the software MATLAB. Third, the ankle rehabilitation device is successfully manufactured from aluminum and uses linear actuators to emulate dorsiflexion and plantarflexion exercises for humans. The advantages of the device are a simple design, low cost, and mounts onto rehabilitative equipment. The device can operate fast through experiments, has a foot drive mechanism overshoot of 0°, and a maximum angle error of 1°. Moreover, the rehabilitation robot can operate consistently and is comfortable for stroke patients to use. Finally, we will fully develop the device and proceed to clinical implementation.
Źródło:
Archive of Mechanical Engineering; 2022, LXIX, 1; 147--163
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konserwacja kościoła de Fontaines w Neuchâtel
RESTORATION OF DE FONTAINES CHURCH AT NEUCHÂTEL, SWITZERLAND
Autorzy:
Łysiak, Waldemar
Powiązania:
https://bibliotekanauki.pl/articles/536139.pdf
Data publikacji:
1972
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
kościół de Fontaines w Neuchâtel
Neuchatel w Szwajcarii
Camillo Boito
idea Viollet-le-Duca
Viollet-le-Duc
duch zabytku
Opis:
Basing on example of a small de Fontaines church at Neuchâtel, Switzerland the author deals With an essential problem of adaptative restoration works being undertaken in architectural objects of historical character. Though the building in question, when considered from the viewpoint of history of art, cannot be classified as one belonging to the top category the restoration works carried out gave rise to a great deal of interesting discussion. The problems involved in restoration of th a t church were presented in the summer of 1971 at the International Centre for the Study of Preservation and the Restoration of Cultural Property, Rome, th a t has been established under the auspices of UNESCO, as a specific fea ture in certain modern tendencies present in the conservator’s work. During th e course of restoration in 1969 from the church interior were removed its neo-Gothic fittings made of wood, except for pulpit, whose place took a number of wood furnishings extremely simple in their shapes. In this strive to achieve an intended simplicity and the most functional character of the church’s interior the conservators have, however, advanced too far, as the new fittings are quite drastically modern as to their forms and worse still in sharp contrast to architecture. In this connection the fact th a t from among elements of the former fittings the pulpit has been left as the only element seems to be a misunderstanding or even failure. The author emphasizes th a t it is not the change of fittings alone with which he is dealing in his article but the so-called spirit of the monument meant as the character and climate of authenticity. The excessively modernized interior of de Fontaines church has become one sterile and deprived of colour thus loosing its intrinsic climate and character.
Źródło:
Ochrona Zabytków; 1972, 1; 27-31
0029-8247
Pojawia się w:
Ochrona Zabytków
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research and design of multi-directional dumping construction in trucks
Autorzy:
Hong, Thong Duc
Thai, Hiep Thanh
Powiązania:
https://bibliotekanauki.pl/articles/27311344.pdf
Data publikacji:
2023
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
multi-dimensional dump truck
three-axis modern trailer
three direction dropping dumper
wielowymiarowa wywrotka
nowoczesna przyczepa trójosiowa
wywrotka trójstronna
Opis:
In the current transportation industry, especially transporting coal, sand, heavy stone, construction waste, etc., dump trucks occupy a critical position. Most traditional dump trucks can only dump goods vertically, so their manoeuvrability is not high. Especially in tight spaces such as construction sites, it causes many difficulties for loading and unloading traditional dump trucks, which takes a lot of time and effort for the driver. In this paper, we have mainly focused on solving the above difficulties. Hence a multi-dimensional dump truck model was designed. The hydraulic motor actuated by the directional valve rotates the container on the required side. This design aims to improve the features and performance of dump trucks compared to existing conventional vehicles. This concept will save operating costs & energy consumption, which leads to increased efficient working. In this study, the dump truck can rotate 1800 in both directions through a hydraulic motor and gearbox linked with slewing bearing.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 119; 5--18
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of static and dynamic methods based on knee kinematics to determine optimal saddle height in cycling
Autorzy:
Millour, Geoffrey
Duc, Sebastien
Puel, Frederic
Bertucci, William
Powiązania:
https://bibliotekanauki.pl/articles/306841.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
komfort
biomechanika stawu
zapobieganie urazom
performance
comfort
joint biomechanics
injury prevention
Opis:
Bike-fitting methods based on knee kinematics have been proposed to determine optimal saddle height. The Holmes method recommends that knee angle be between 25° and 35° when the pedal is at bottom dead centre in static. Other authors advocate knee angle of 30–40° during maximum knee extension while pedalling. Although knee angle would be 5–10° greater at bottom dead centre during pedalling, no study has reported reference values in this condition. The purpose of this study was to compare these three methodologies on knee, hip, and ankle angles and to develop new dynamic reference range at bottom dead centre. Methods: Twenty-six cyclists volunteered for this experiment and performed a pedalling test on their personal road or mountain bike. Knee, hip, and ankle angles were assessed by two-dimensional video analysis. Results: Dynamic knee angle was 8° significantly greater than static knee angle when the pedal was at bottom dead centre. Moreover, dynamic knee angle with the pedal at bottom dead centre was 3° significantly greater than dynamic knee angle during maximum knee extension. The chosen methodology also significantly impacted hip and ankle angles under most conditions. Conclusions: The results allow us to suggest a new range of 33–43° when the pedal is at bottom dead centre during pedalling. Thus, this study defines clearly the different ranges to determine optimal saddle height in cycling according to the condition of measurement. These findings are important for researchers and bike-fitting professionals to avoid saddle height adjustment errors that can affect cyclists’ health and performance.
Źródło:
Acta of Bioengineering and Biomechanics; 2019, 21, 4; 93-99
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rainfall Threshold for Landslide Warning in Southern Thailand – An Integrated Landslide Susceptibility Map with Rainfall Event – Duration Threshold
Autorzy:
Salee, Rattana
Chinkulkijniwat, Avirut
Yubonchit, Somjai
Bui Van, Duc
Powiązania:
https://bibliotekanauki.pl/articles/2202301.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
rainfall threshold
landslide susceptibility level
contingency matrix
skill score
Opis:
Southern Thailand is one of hotspots for landslides. So far, the rainfall triggered landslides in this region caused many sufferers and fatalities. On the basis of the rainfall data that triggered ninety-two landslide events during 1988–2018 and the landslide susceptibility maps published by the Department of Mineral Resources (DMR), this study introduced rainfall event-duration (ED) thresholds, namely EDm and EDh thresholds, for the places classified as the modest and the huge susceptibility levels, respectively. The modest susceptibility is a combination of very low, low, and moderate landslide susceptibility levels indicated in DMR maps. The huge susceptibility is a combination of high and very high landslide susceptibility levels indicated in DMR maps. Indicated by an area under the receiver operating characteristic curve (AUC), the EDm and EDh thresholds yielded the significantly better predictability than the original threshold did. Furthermore, the EDm threshold yielded the perfect prediction with AUC of 1.00.
Źródło:
Journal of Ecological Engineering; 2022, 23, 12; 124--133
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of wastewater from intensive striped catfish farming using Hymenachne acutigluma in batch surface-constructed wetland
Autorzy:
Kieu, Le Diem
Nguyen, Pham Quoc
Duc, Ha Danh
Powiązania:
https://bibliotekanauki.pl/articles/2032943.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Hymenachne acutigluma
Pangasianodon hypophthalmus
wastewater treatment
food
breeding
oczyszczanie ścieków
żywność
hodowla
Opis:
Intensive striped catfish (Pangasianodon hypophthalmus) farming has recently expanded owing to its economic benefits but it has led to severe aquatic pollution. In this study, a batch surface-constructed wetland system cultivated with Hymenachne acutigluma grass was designed to treat wastewater collected from catfish ponds. The planted wetland system showed effective operation, as 81.7% of NO-3-N, 63.6% of NH+4-N, and 77.5% of PO3-4-P (w/w) in the wastewater were removed over four months. Besides, the wetland significantly decreased the chemical oxygen demand and total suspended solids from the wastewater. The absorption by the grass resulted in the removal of 20.3 and 22.2% of the total nitrogen (N) and phosphorus (P) from wastewater, respectively. The determination of the nutrient mass balance in the planted system showed that phosphorus in the wastewater was mainly removed through sediment deposition, while a large amount of nitrogen was not lost because of the sediment deposition and plant uptake. Moreover, H. acutigluma cultured in the system can serve as food for cattle. This study shows an ecofriendly approach for the effective remediation of wastewater obtained from the farming of intensive striped catfish.
Źródło:
Environment Protection Engineering; 2021, 47, 1; 29-40
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geotechnical mechanisms of roof fall ahead of face support in longwall mining
Geotechniczne mechanizmy opadania stropu przed podparciem ściany w górnictwie ścianowym
Autorzy:
Le, Tien Dung
Duc, Hung Pham
Quang, Hung Dang
Powiązania:
https://bibliotekanauki.pl/articles/317854.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
górnictwo
ściany
geotechnika
longwall mining
walls
geotechnics
Opis:
Longwall mining is one of the most productive methods for extracting underground coal seams. Although the understanding of longwall mining-associated geotechnical mechanisms has been significantly improved that contributes to better ground control, roof rock/top coal fall ahead of support (roof fall) has not been fully understood that causes severe damage to equipment and casualty at face. Empirical, theoretical and modelling methods were successfully used in past studies to understand the mechanisms driving roof fall; however, key mechanisms and their interactions during the fall were not satisfactorily investigated due to limitation of each method. This study aims to gain a systematic understanding of roof fall mechanisms in longwall operation. A review of past studies on roof fall is implemented with emphasis on the principles of applied research methods. The study confirms that the interaction between roof strata, coal seam and face support largely controls roof fall while numerical modelling shows great potential in studying roof fall complex mechanisms. The paper’s findings provide mining engineers/scientists with a systematic understanding on roof fall from which more effective roof control strategies can be further developed.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 98-104
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Migracja kolista. Tożsamościowe wędrowanie Łemków: tekst i rytuał
Circular Migration. Identity Treks of the Lemkos: Text and Ritual
Autorzy:
Duć-Fajfer, Helena
Powiązania:
https://bibliotekanauki.pl/articles/14739282.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
migration
Lemko expulsion
the Lemkos
Lemko literature
identity
reinvention
migracja
wysiedlenia łemkowskie
Łemkowie
iteratura łemkowska
tożsamość
reinwencja
Opis:
Punktem wyjścia dla migracyjnej/diasporyjnej tożsamości Łemków były totalne dwuetapowe wysiedlenia tej społeczności w latach 1945–1946 i 1947. Wraz z tym faktem osiadła, rdzenna wspólnota, która ukonstytuowała swą tożsamość na wyznaczniku terytorialnym, stała się społecznością rozproszoną na kilku obszarach diasporyjnych. Musiała zatem dokonać się istotna reinwencja tożsamościowa konstruowana na wyznaczniku migracyjnym. Celem artykułu jest uchwycenie istoty mitu reinwencyjnego mającego wymiar rytualny – powtarzane cyklicznie rytuały podróżowania pomiędzy ziemiami wygnania i karpacką ojczyzną, oraz wymiar tekstualny – nadający sens i symboliczną wartość tym wędrówkom. Bazę empiryczną do badań stanowią teksty kulturowe, głównie piśmiennictwo łemkowskie z ostatnich dziesięcioleci oraz dane z obserwacji uczestniczącej i badań terenowych przeprowadzonych przez autorkę w 2017 roku na trzech znacznie oddalonych od siebie obszarach aktualnie zamieszkiwanych przez Łemków.
The total, two-stage resettlement of the Lemkos in 1945–46 and 1947 was the point of departure for their migration/diaspora identity. Consequently, the settled, native community that had established its identity upon a territorial determinant became a community dispersed over several diaspora territories. Therefore, a crucial identity reinvention had to take place, constructed upon the migration determinant. The purpose of this paper is to capture the essence of the reinventive myth of a ritual dimension—the cyclic rituals of traveling between the lands of expulsion and the Carpathian motherland, and the textual dimension—providing meaning and symbolic value to these treks. The empirical, material basis for the research is provided by cultural texts, mainly Lemko writings from recent decades, as well as data from participant observation and field studies carried out by the author in 2017 in three areas currently inhabited by the Lemkos and considerably distant from one another.
Źródło:
Porównania; 2022, 32, 2; 81-100
1733-165X
Pojawia się w:
Porównania
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-objective optimization of the cylindrical grinding process of SCM440 steel using preference selection index method
Autorzy:
Tien, Dung Hoang
Trung, Do Duc
Thien, Nguyen Van
Nguyen, Nhu-Tung
Powiązania:
https://bibliotekanauki.pl/articles/1833757.pdf
Data publikacji:
2021
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
MRR
Taguchi PSI method
surface roughness
cylindrical grinding process
Opis:
This paper presents a study to ensure the minimum values of Ra and Rz, and the maximum value of MRR when external cylindrical grinding by the PSI method. The experiments were performed according to the orthogonal Taguchi L9 matrix with the input parameters including workpiece speed, feed rate, and depth of cut in the conventional grinding machine. Analysis of experimental results by Pareto chart showed that the feed rate and the depth of cut most influence on Ra and Rz, respectively. Feed rate and depth of cut all have a great influence on MRR. Meanwhile, the workpiece speed has a negligible effect on all three output parameters. The research results showed that to obtain the minimum values of Ra and Rz, and maximum of MRR, the workpiece speed, feed rate, and depth of cut were 400 rev/min 37.7 mm/min, 0.09 mm/rev, and 0.02 mm, respectively.
Źródło:
Journal of Machine Engineering; 2021, 21, 3; 110--123
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Machining performance optimization of Parallel Kinematic Machines tools with regard to their anisotropic behaviour
Autorzy:
Pateloup, S.
Bonnemains, T.
Chanal, H.
Bouzgarrou, B. C.
Duc, E.
Ray, P.
Powiązania:
https://bibliotekanauki.pl/articles/1429122.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
parallel kinematic machine too
kinematic model
static model
tool path optimization
Opis:
Today, Parallel Kinematic Machines tools (PKMs) appear in automotive and aeronautic industries. These machines allow a benefit of productivity due to their higher kinematics performances than Serial Kinematic Machines tools (SKMs). However, their machining accuracy is lower. Moreover, the compensation of the defects which penalizes the machined parts quality is difficult due to their anisotropic behaviour. Thus, this article deals with the development of methods improving the machined parts quality and the productivity. In order to improve parts quality, the static behaviour of the machine structure is considered with a model taking into account joints and legs compliances. Then, it allows determining a static workspace. About the productivity, the improvement of kinematics performances is performed through an optimization work of the non productive tool path between cutting operations. The computed tool path must verify a minimum time constraint and avoid collisions between the tool and the machined part. All the methods are illustrated with the PKM Tripteor X7 developed by PCI.
Źródło:
Journal of Machine Engineering; 2008, 8, 4; 13-24
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
W ślad za autorem: Pierre’a-Daniela Hueta uwagi o tłumaczeniu
Fallowing the Author: Pierre-Daniel Huet’s Remarks about Translation
Autorzy:
Probulski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/636360.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Jacques Auguste de Thou
Pierre-Daniel Huet
De optimo genere interpretandi
Isaac Casaubon
Fronton du Duc
Opis:
The first part of 1683 De optimo genere interpretandi sets the scene for Huet’s dialogue and introduces its participants: Isaac Casaubon (1559–1614) is comissioned to lay out his principles of translation, while Fronton du Duc (1558–1624) and Jacques Auguste de Thou (1553–1617) are meant to evaluate his views and ask questions regarding Casaubon’s theses. Casaubon’s lecture begins with a definition of interpretatio as sermo lingua notiore expressus, sermonem lingua minus nota expressum referens ac repraesentans (“a discourse in expressed in a better known language, referring to and representing a discourse in a lesser known language”), which is then followed by remarks separating interpretatio from such terms as aemulatio and paraphrasis. The speakers then discuss the principles of “the best kind of translation” in regard to Casaubon’s notion that the strict semantic, lexical and stylistic accuracy should be preffered by the translators over “appropriating” (convertere) the ancient authors to suit the tastes of the contemporaries. After those basic principles are given, Casaubon, de Thou and du Duc reflect on problems posed by the Casaubon’s approach to translation: mainly, the differences between particular languages, the lexical discrepancies and the difficulties regarding use of Casaubon’s method to different categories of texts (e.g. How important is it to represent the style of the original in the case of scientific texts?).
Źródło:
Terminus; 2011, 13, 24; 193-196
2084-3844
Pojawia się w:
Terminus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical prediction of propeller-hull interaction characteristics using RANS method
Autorzy:
Tu, Tran Ngoc
Luu, Do Duc
Ha, Nguyen Thi Hai
Quynh, Nguyen Thi Thu
Vu, Nguyen Minh
Powiązania:
https://bibliotekanauki.pl/articles/258472.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
propeller
interaction
hull
wake fraction
thrust deduction
relative rotative efficiency
RANS equations
Opis:
The paper presents the results of computational evaluation of the hull-propeller interaction coefficients, also referred to propulsive coefficients, based on the unsteady RANS flow model. To obtain the propulsive coefficients, the ship resistance, the open-water characteristics of the propeller, and the flow past the hull with working propeller were computed. For numerical evaluation of propeller open-water characteristics, the rotating reference frame approach was used, while for self-propulsion simulation, the rigid body motion method was applied. The rotating propeller was modelled with the sliding mesh technique. The dynamic sinkage and trim of the vessel were considered. The free surface effects were included by employing the volume of fluid method (VOF) for multi-phase flows. The self-propulsion point was obtained by performing two runs at constant speed with different revolutions. The well-known Japan Bulk Carrier (JBC) test cases were used to verify and validate the accuracy of the case studies. The solver used in the study was the commercial package Star-CCM+ from SIEMENS.
Źródło:
Polish Maritime Research; 2019, 2; 163-172
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An advanced IoT system for monitoring and analysing chosen power quality parameters in micro-grid solution
Autorzy:
Khoa, Ngo Minh
Dai, Le Van
Tung, Doan Duc
Toan, Nguyen An
Powiązania:
https://bibliotekanauki.pl/articles/1841334.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
energy management
internet of things (IoT)
micro-grid
power quality (PQ)
ThingSpeak cloud
Opis:
This paper proposes an advanced Internet of Things (IoT) system for measuring, monitoring, and recording some power quality (PQ) parameters. The proposed systemis designed and developed for both hardware and software. For the hardware unit, three PZEM-004T modules with non-invasive current transformer (CT) sensors are used tomeasure the PQ parameters and an Arduino WeMos D1 R1 ESP8266 microcontroller isused to receive data from the sensors and send this data to the server via the internet. For the software unit, an algorithm using Matlab software is developed to send measurement datato the ThingSpeak cloud. The proposed system can monitor and analyse the PQ parameters including frequency, root mean square (RMS) voltage, RMS current, active power, and the power factor of a low-voltage load in real-time. These PQ parameters can be stored on theThingSpeak cloud during the monitoring period; hence the standard deviation in statistics of the voltage and frequency is applied to analyse and evaluate PQ at the monitoring point.The experimental tests are carried out on low-voltage networks 380/220 V. The obtained results show that the proposed system can be usefully applied for monitoring and analysing chosen PQ parameters in micro-grid solutions.
Źródło:
Archives of Electrical Engineering; 2021, 70, 1; 173-188
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The status and prospect of mining technology in Vietnam underground coal mines
Stan i perspektywy technologii górniczych w kopalniach podziemnych w Wietnamie
Autorzy:
Duong Duc, Hai
Quang, Dao Hong
Turek, Marian
Koteras, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/318463.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
kopalnie podziemne
Wietnam
technologia
underground coal mines
Vietnam
technology
Opis:
Vietnam has the 13th largest hard coal reserves globally, with the reserves totaling 2.22 billion tonnes, and estimated resources of 4.07 billion tonnes. Coal use is playing an increasing role in the energy mix and according to current planning, this role is to increase further. In parallel with the development of the Vietnamese coal sector, underground mining also underwent many stages of improvements, especially in the last two decades. This paper analyzes the achievement and the state of the mining technology applied into the underground mining by the Vietnam National Coal - Mineral Industries Holding Corporation Ltd. (VINACOMIN) during 20 year period and proposes the recommendations for the sustainable development of Vietnam underground mining.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 147-155
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of whole body vibration in energy expenditure and perceived exertion during intense squat exercise
Autorzy:
Bertucci, W.
Arfaoui, A.
Duc, S.
Letellier, Th.
Brikci, A.
Powiązania:
https://bibliotekanauki.pl/articles/306283.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
trening wibracyjny
energia
wysiłek
whole body vibration
energy expended
intense squat exercise
rating of perceived exertion
Opis:
Purpose: The purpose of this study was to investigate the effect of whole body vibration in oxygen uptake during intense squatting exercise with an added weight and whole body vibration compared with the same exercise without vibration. Methods: Nine male subjects performed three trials of dynamic squatting with an additional load of 50% of their body weight during 3 min. One trial without vibration, one trial with the frequency of 40 Hz and amplitude of 2 mm and one trial with the frequency of 40 Hz and amplitude of 4 mm. Results: The results showed no difference between the three experimental trials in relative and absolute oxygen uptake. However, the metabolic power and energy expended in whole body vibration (2 mm) were significantly different from exercise without vibration. The data analysis also showed a significant difference in rating of perceived exertion with whole body vibration (4 mm) compared with the exercise without vibration. Results showed that the addition of vibration stimulus has an increase in the energy expenditure particularly with 40 Hz and 2 mm amplitude, suggesting that the high metabolic power during heavy resistance training could be increased by the addition of vibration stimulation. Conclusions: Involuntary contractions generated by the vibration can be used by coaches to increase the intensity of heavy resistance training or to increase the energy expended during the workouts if the goal is a decrease of body mass.
Źródło:
Acta of Bioengineering and Biomechanics; 2015, 17, 1; 87-93
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Coal Exploitation on Tidal Flat Changes, an Investigation Using Remote Sensing Data in Vietnam
Autorzy:
Pham, Thi Lan
Tong, Si Son
Le, Thi Thu Ha
Le, Thi Le
Hoang, Huu Duc
Powiązania:
https://bibliotekanauki.pl/articles/2020940.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
tidal flat
coal
remote Sensing
przypływy
węgiel
teledetekcja
Opis:
Tidal flat plays a crucial role in socio-economic development and ecological environment. Tidal flats in Ha Long-Cam Pha in Vietnam are impacted by human activities, especially coal mining activities. Using remote sensing data is able to detect, extract, and monitor the changes of tidal flats and exploited coal mine area with multi-temporal, in various scales, and for a large coverage. This study aims to investigate the impact of coal mining activities on the changes of tidal flats using remote sensing in Cam Pha, Ha Long, one of the biggest coal basins in Vietnam. Digital Elevation Models (DEMs) of tidal flats constructed by Landsat satellite images acquired in years 1989, 2001, and 2014 are compared to determine the volume changes. Besides, coal mining activities including coal production, waste rock dump area, and the expansion of open coal mine during the period 1989-2014 are investigated using correspondent Landsat images and the reports from the coal mine companies in the study area. Sediment samples in tidal flats are analyzed to determine the origin of the sediments. As the results, organic matter in the tidal flats is dominant with the concentration of 459 g/kg to 607 g/kg, which is evidence for the impact of coal exploitation on the coastal environment. In addition, the relationship between coal mine activities and tidal flat variation is well observed in this study.
Źródło:
Inżynieria Mineralna; 2021, 2; 521--532
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Delay factors in the construction of irrigation and hydropower projects in Vietnam
Autorzy:
Nguyen, Van Son
Nguyen, Huu Hue
Nguyen, Duc Anh
Hai, Dinh Tuan
Powiązania:
https://bibliotekanauki.pl/articles/2203414.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hydroenergetyka
nawadnianie
konstrukcja
zarządzanie projektem
współczynnik opóźnienia
Wietnam
hydropower
irrigation
construction
project management
delay factor
Vietnam
Opis:
Irrigation and hydropower are among the most important sectors in the construction industry that propel the economic needs of a developing country like Vietnam. The construction of these projects often suffers from severe delays, leading to financial losses and other negative impacts on the economy. This paper aims to determine delay factors in the construction of these projects. Among many, 39 most important candidates of delay causes were identified from the literature review. Further surveys on project participants were conducted for the severity of these causes. An exploratory factor analysis was utilized to identify latent factors that cause delays in construction projects. The analysis result categorized a few groups of factors such as abnormal factors on the construction site (e.g., labor accidents, hydrology, water flow, extreme weather) and technical factors related to the construction contractor (e.g., unsuitable schedule, outdated construction technology, unprofessional workers) that have the greatest impact on the delay in construction of irrigation and hydropower projects in Vietnam. These findings contribute to the body of knowledge of project management and risk management, hence an improvement in the efficiency of the project sectors’ performance.
Źródło:
Archives of Civil Engineering; 2023, 69, 1; 5--20
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new chemical mechanical slurry for polishing yttrium aluminium garnet material with magnesium oxide, sodium metasilicate pentahydrate and zirconium dioxide abrasive particles
Autorzy:
Duc, Le Anh
Hieu, Pham Minh
Quang, Nguyen Minh
Powiązania:
https://bibliotekanauki.pl/articles/24084631.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
chemical-mechanical polishing
yttrium aluminum garnet
magnesium oxide
abrasive particles
Opis:
This work provided a new chemical-mechanical polishing mixture with MgO, sodium metasilicate pentahydrate, ZrO2 abrasive particles, and deionized water. With chemical-mechanical slurry (CMS) proposed for polishing yttrium aluminum oxide (Y3Al5O12) the surface reaction layer formed with significantly reduced hardness compared to other Y3Al5O12 materials, these products combine with MgO to form montmorillonites (3MgO–Al2O3–3SiO2–3Y2O3–5Al2O3). With this formation, the surface layer of Y3Al5O12 material becomes soft and is easily removed by ZrO2 abrasive particles under the influence of mechanical polishing, resulting in superfine surfaces generated from the proposed CMS model. The experimental results show that the surface quality with CMS proposed gives the surface quality with Ra = 0.471 nm along with the material removal rate 31 (nm/min). Surface quality is improved by 71% along with a superior material removal rate (increased by 287%) compared to silica slurry. The results show excellent polishing ability from CMS proposed for polishing Y3Al5O12 materials.
Źródło:
Journal of Machine Engineering; 2023, 23, 2; 174--185
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolation of citronellal and geraniol from citronella (Cymbopogon winterianus) oil by vacuum fractional distillation: Effect of operating conditions on the separation
Autorzy:
Le, Minh-Trung
Vu, Duc-Phuong
Nguyen, Thanh Ngoc
Le, Xuan-Tien
Powiązania:
https://bibliotekanauki.pl/articles/27315670.pdf
Data publikacji:
2023
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
citronellal
geraniol
vacuum
fractional distillation
citronella oil
Opis:
This study used fractional distillation to separate citronellal and geraniol from citronella (Cymbopogon winterianus) essential oil to improve their market value. The one-factor-at-a-time methodology investigated operating parameters’ optimum conditions and effects, including system pressure, packing types, and column height. All investigations were evaluated based on their main fraction’s citronellal and geraniol content and recovery. Regarding the effect of the variables, a higher system pressure improved the separation while increasing the temperature range of each fraction and distillation time. The packing types would also improve the separation by providing a large surface area. Finally, the column height also positively impacted the separation. In the optimum citronella oil fractionation, citronellal content experienced a 2.5-fold increase, from 37.68% to 94.33%. Geraniol purity reached 40.61% from an initial content of 17.33% in the raw CW oil. The distillation could recover up to 90.00% of citronellal and 68.18% of geraniol.
Źródło:
Polish Journal of Chemical Technology; 2023, 25, 4; 67--80
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free vibration analysis of sandwich beam with porous FGM core in thermal environment using mesh-free approach
Autorzy:
Hung, Tran Quang
Tu, Tran Minh
Duc, Do Minh
Powiązania:
https://bibliotekanauki.pl/articles/27309844.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
thermal vibration
mesh-free method
sandwich beam
porous materials
wibracje termiczne
metoda bezsiatkowa
belka kanapkowa
materiały porowate
Opis:
Thermally induced free vibration of sandwich beams with porous functionally graded material core embedded between two isotropic face sheets is investigated in this paper. The core, in which the porosity phase is evenly or unevenly distributed,has mechanical properties varying continuously along with the thickness according to the power-law distribution. Effects of shear deformation on the vibration behavior are taken into account based on both third-order and quasi-3D beam theories. Three typical temperature distributions, which are uniform, linear, and nonlinear temperature rises, are supposed. A mesh-free approach based on point interpolation technique and polynomial basis is utilized to solve the governing equations of motion. Examples for specific cases are given, and their results are compared with predictions available in the literature to validate the approach. Comprehensive studies are carried out to examine the effects of the beam theories, porosity distributions, porosity volume fraction, temperature rises, temperature change, span-to-height ratio, different boundary conditions, layer thickness ratio, volume fraction index on the vibration characteristics of the beam.
Źródło:
Archive of Mechanical Engineering; 2022, LXIX, 3; 471--496
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust H∞ fuzzy approach design via Takagi‐Sugeno descriptor model. application for 2‐DOF serial manipulator tracking control
Autorzy:
Thi, Van Anh Nguyen
Pham, Duc Binh
Nguyen, Danh Huy
Nguyen, Tung Lam
Powiązania:
https://bibliotekanauki.pl/articles/27314207.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
tracking control
serial manipulator robot
fuzzy control
Takagi-Sugeno
Lyapunov stability
Opis:
This paper focuses on trajectory tracking control for ro‐ bot manipulators. While much research has been done on this issue, many other aspects of this field have not been fully addressed. Here, we present a new solution using feedforward controller to eliminate parametric uncer‐ tainties and unknown disturbances. The Takagi‐Sugeno fuzzy descriptor system (TSFDS) is chosen to describe the dynamic characteristics of the robot. The combination of this fuzzy system and the robust H∞ performance makes the system almost isolated from external factors. The li‐ near matrix inequalities based on the theory of Lyapunov stability is considered for control design. The proposed method has proven its effectiveness through simulation results.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2022, 16, 3; 22--29
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current Situation of State Management on Mineral Mining in The North Eastern Vietnam and Tasks Proposal for Audit Activities
Autorzy:
Bui, Thi Thu Thuy
Pham, Thu Huong
Duong, Quang Chinh
Duong, Duc Trung
Powiązania:
https://bibliotekanauki.pl/articles/27323267.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
minerals mining
audit
north-eastern Vietnam
surowce mineralne
górnictwo
Wietnam
Opis:
Vietnam is a country with abundant mineral resources, in recent years, the minerals mining (MM) has affirmed its very important position in contributing to the development of the national products, alleviate Vietnam's economy to a higher level at a rapid pace in recent years. However, the MM in recent years has caused many negative impacts on long-term economic and social development, posing unpredictable consequences on the environment... This leads to the need to strengthen the Government’s management work. In the effort to manage mining extraction, this is considered a complex field that has not been uniformly understood, and there remains several inadequacies and insufficient support in the process of performing management procedure. Therefore, although the Government requires to tighten the management of mineral exploitation, the effectiveness and efficiency are not reached, and many mistakes occur in the process of the procedure. Given the mentioned challenges of the management of control and the audit results of the State Audit on internal audit in recent years, there are a number of important tasks that need to be focused on auditing, including (i) Audit of mining license; (ii) Audit of mined reserves and output; (iii) Audit of environmental safety protection and inspection of mining activities.
Źródło:
Inżynieria Mineralna; 2023, 2; 23--28
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System identifications of a 2DOF pendulum controlled by QUBE-servo and its unwanted oscillation factors
Autorzy:
Le, Hoai Nam
Dang, Phuoc Vinh
Pham, Anh-Duc
Vo, Nhu Thanh
Powiązania:
https://bibliotekanauki.pl/articles/1845011.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
system identification 2DOF pendulum
QUBE-servo
unwanted oscillation model
system identyfikacji
niepożądany model oscylacji
Opis:
System identification is an approach for parameter detection and mathematical model determination using response signals of a dynamic system. Two degrees of freedom (2DOF) pendulum controlled by a QUBE-servo motor is a great experiment device to work with; though it is not easy to control this system due to its complex structure and multi-dimensional outputs. Hence, system identification is required for this system to analyze and evaluate its dynamic behaviors. This paper presents a methodology for identifying a 2DOF pendulum and its dynamic behaviors including noise from an encoder cable. Firstly, all parameters from both mechanical and electrical sides of the QUBE-servo motor are analyzed. Secondly, a mathematical model and identified parameters for the 2DOF pendulum are illustrated. Finally, disturbances from encoder cable of the QUBE-servo motor which introduce an unwanted oscillation or self-vibration in this system are introduced. The effect of itself on output response signals of the 2DOF QUBE-pendulum is also discussed. All identified parameters are checked and verified by a comparison between a theoretical simulation and experimental results. It is found that the disturbance from encoder cable of the 2DOF QUBE-pendulum is not negligible and should be carefully considered as a certain factor affecting response of system.
Źródło:
Archive of Mechanical Engineering; 2020, LXVII, 4; 435-450
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Education in the context Industry 4.0 at the Brandenburg University of Technology Cottbus-Senftenberg
Autorzy:
Jankowski, Eckbert
Dressler, Christoph André
Tran Anh, Duc
Powiązania:
https://bibliotekanauki.pl/articles/339719.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Zarządzania Produkcją
Tematy:
Industry 4.0
big data
RFID
cloud computing
education
BTU
Brandenburg Technical University Cottbus
edukacja
Brandenburski Uniwersytet Techniczny w Chociebużu
Opis:
The industrial development of the economy requires specialists in handling processes and digitization. This applies to both the manufacturing industry and the service sector. Human-machine communication plays a major role in this aspect. The Chair of Industrial Information Technology at the Brandenburg Technical University Cottbus-Senftenberg is an educational institution. One of the main focuses is teaching in information management and the associated communication strategy with its IT environment. The students are introduced to real processes and trained through experimental exercises by means of practical approaches in research. To this end, the IIT Chair uses current technologies that are state of the art in industry. This is illustrated in this article by the production of floor coverings.
Źródło:
Zarządzanie Przedsiębiorstwem; 2019, 22, 3; 19-23
1643-4773
Pojawia się w:
Zarządzanie Przedsiębiorstwem
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
О ПРИЕМЕ «УСВОЕНИЯ»: ЛЮБОВЬ АРМАНА-ЛУИ ЛОЗЕНА И ИЗАБЕЛЛЫ ЧАРТОРЫЙСКОЙ В ПЬЕСЕ МАРИНЫ ЦВЕТАЕВОЙ ФОРТУНА
POETICS OF APPROPRIATION: LOVE OF DUC DE LAUZUN AND IZABELA CHARTORYSKA IN MARINA TSVETAEVA’S PLAY FORTUNA
Autorzy:
Janczuk, Elena
Powiązania:
https://bibliotekanauki.pl/articles/445040.pdf
Data publikacji:
2015-06-01
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
Marina Tsvetaeva
Fortuna
intertextuality
poetics of appropriation
identity
Opis:
This article discusses the poetics of appropriation of historical and literary material as a way of the reevaluation of the past proposed by M. Tsvetaeva. In the poet’s consciousness, the coexistence and comparison of different times and historical parallels are inevitably linked to her presence and, at the same time, the material employed by Tsvetaeva does not only show any reality, but it recreates reality according to her own vision of this particular material. Tsvetaeva accentuates the primacy of created reality over historical existence. One part of Tsvetaeva’s play Fortuna presents the transformation of the real love story between Izabela Chartoryska and duke Lauzan into a literary history, and finally the process of the disappearance of this story in her real life. ‘Disappearance’ of Lauzan’s image leads the poet in her life and Tsvetaeva becomes engaged with Lauzan by a very idiomatic relationship.
Źródło:
Acta Neophilologica; 2015, XVII/1; 103-112
1509-1619
Pojawia się w:
Acta Neophilologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on optimizing spray parameters for Cr3C2 – NiCr coating created on alloy steel by plasma spraying technique
Autorzy:
Dang, Thao Xuan
Son, Nguyen Hong
Cuong, Pham Duc
Powiązania:
https://bibliotekanauki.pl/articles/2171770.pdf
Data publikacji:
2022
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
Cr3C2-NiCr
plasma spraying
coating
optimization
E355 alloy steel
Opis:
In this work, Cr3C2-NiCr ceramic coating with NiCr content of 30% was created on E355 (St 52-3)/1.0060 alloy steel substrate by air plasma thermal spraying (APS) method. The adhesion, tensile strength of the coating were studied in relation to spray parameters including current intensity, powder feed rate, and stand-off distance according to experimental planning. Experiments were designed based on Central Composite Design method. The adhesion and tensile strength of the coatings were measured by a tensile-compression machine. Analysis of variance (ANOVA) were used to build regression functions expressing the relationship between each property and spray parameters. The experimental results showed that those spray parameters significantly influence the properties of the coating. ANOVA results indicated that the spray parameters have different influences for each coating properties. In addition, regression model of the properties gives prediction results very close to experimental results. The optimization problem was solved in order to achieve the maximum value of adhesion and tensile strength of the coating. Values of the spray parameters for Cr3C2 – NiCr coating to achieve the above criteria have been determined and proposed in this study.
Źródło:
Journal of Machine Engineering; 2022, 22, 4; 43--53
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study on fault ride-through capability of VSC-based HVDC transmission system
Autorzy:
Khoa, Ngo Minh
Toan, Nguyen An
Tung, Doan Duc
Powiązania:
https://bibliotekanauki.pl/articles/1841366.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
converter system
experimental waveform
fault ride through
High Voltage Direct Current
voltage sag
system konwertera
eksperymentalny przebieg
prąd stały wysokiego napięcia
spadek napięcia
Opis:
For voltage-source-converter based high-voltage-direct-current (VSC-HVDC)transmission systems, fault ride-through (FRT) capability is a very important grid requirement in order to enhance its operational availability under an alternating current (AC) gridfault condition. Voltage sags during a short-circuit fault in power transmission lines can leadto fluctuations in the direct current (DC) link voltage of converter systems, and may inducereversed power flow and even trip a VSC-HVDC transmission system. A practical methodis developed in this paper for investigating FRT capability of VSC-HVDC transmissionsystem characteristics during a voltage sag event using experimental results from Smart Grid Laboratory. Symmetrical and asymmetrical voltage sag events with different remaining voltages are applied to an AC grid that lasts with a variable duration. The experimental waveforms of the two converter systems are recorded and analyzed in order to evaluate theFRT capability of VSC-HVDC transmission systems.
Źródło:
Archives of Electrical Engineering; 2021, 70, 1; 37-51
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Titus-research: blockchain strategy for autonomous systems
Autorzy:
Henningsen, Sebastian
Rashwan, Abdalla
Demircan, Evrim
Tran, Duc
Meinberg, Uwe
Powiązania:
https://bibliotekanauki.pl/articles/37176006.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Zarządzania Produkcją
Tematy:
distributed ledger technology
blockchain
autonomous systems
technologia rozproszonego rejestru
systemy autonomiczne
Opis:
Distributed ledger technology has been getting an increased attention in a wide range of applications where a centralized solution is not favorable. One of the most popular DLTs is the well-known Blockchain technology which is currently being adopted in various domains where several independent agents write to the same shared data collection and it has shown a significant potential when it comes to increasing transparency and providing better security. With autonomous systems gaining more momentum and becoming an inseparable part of our day to day lives from autonomous vehicles to wearable devices therefor this article presents the strategy at TITUS-Research for harnessing the DLT potential in the context of autonomous systems by laying the base knowledge behind DLT and highlighting different use cases where it can improve autonomous systems.
Źródło:
Zarządzanie Przedsiębiorstwem; 2022, 25, 3-4; 10-14
1643-4773
Pojawia się w:
Zarządzanie Przedsiębiorstwem
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
BIM competency in personnel recruitment in Vietnam construction enterprises
Autorzy:
Anh, Pham Xuan
Toan, Nguyen Quoc
Nam, Tran Phuong
Long, Hoang Duy
Thang, Do Duc
Powiązania:
https://bibliotekanauki.pl/articles/27312107.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
kompetencja
modelowanie informacji o budynku
BIM
rekrutacja personelu
personel
firma budowlana
Wietnam
competency
building information modelling
personnel recruitment
personnel
construction company
Vietnam
Opis:
The world has been implementing Building Information Modelling (BIM) successfully to construction projects from small to large scale. In Vietnam and many other countries, BIM is also widely applied in different fields of the construction industry. However, there are still many problems that need to be solved. One of those is to determine the necessary BIM competencies, thereby develop BIM personnel recruitment standards. The article identifies the competencies as well as evaluates their importance when supporting the recruitment of BIM personnel in construction enterprises in Vietnam. Through survey forms such as survey on online recruitment, expert interviews, and survey forms, the study is conducted with Likert scale, relative importance index (RII) for result analysis and ranking the importance of BIM competency for three distinct group of positions in Vietnam. With this result, the authors hope that the study will be an important reference, contributing to the development and concretization of the required competency criteria in the recruitment of BIM personnel in Vietnam and other similar countries.
Źródło:
Archives of Civil Engineering; 2023, 69, 2; 381--397
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Digital Leadership on Organizational Performance: A Study in Vietnams coal Mining Companies
Autorzy:
Le, Van Chien
Nguyen, Duc Thang
Pham, Kien Trung
Nguyen, Thi Hoai Nga
Powiązania:
https://bibliotekanauki.pl/articles/27323234.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
digital transformation
digital leadership
digital transformation strategy
digital skills
organization performance
coal mining company
transformacja cyfrowa
strategia
górnictwo
Opis:
Under the influence of the 4th industrial revolution and the impact of the Covid-19 pandemic, digital transformation is rapidly taking place in all aspects of society. For businesses, digital transformation is an essential and objective trend for their sustainability and development. The purpose of digital transformation for businesses is to enhance operational efficiency through factors such as accelerating market speed, gaining competitive advantage, driving revenue growth, increasing labor productivity, and expanding customer attraction and retention. Numerous studies have indicated that the process of digital transformation in businesses is influenced by leadership and digital transformation strategies, and digital transformation has an impact on business performance. This study aims to identify the relationship between digital leadership and the operational efficiency of coal mining companies in Vietnam, with the mediating role of digital transformation strategies. Additionally, the study examines the moderating role of digital skills on the relationship between digital transformation strategies and the operational efficiency of the organizations. The research surveyed 111 employees and workers currently working in coal mining companies in Vietnam. Through analysis and hypothesis testing, the results showed that digital leadership does not have a direct impact on coal companies’ operational efficiency. However, it indirectly affects business performance through the mediating role of digital transformation strategies. The study's findings also revealed that the digital skills of employees play a moderating role in enhancing the relationship between digital transformation strategies and the operational efficiency of the organization.
Źródło:
Inżynieria Mineralna; 2023, 2; 121--130
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of Nitramine Explosives in Aqueous Solution by UV-Mediated Advanced Oxidation Process in Near-Neutral Conditions
Autorzy:
Khue, Do Ngoc
Bach, Vu Quang
Binh, Nguyen Thanh
Minh, Do Binh
Nam, Pham Thi
Loi, Vu Duc
Nguyen, Hoa Thanh
Powiązania:
https://bibliotekanauki.pl/articles/1838333.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
hexogen
octogen
tetryl
UV
photo-Fenton
electrooxidation
near neutral
Opis:
Explosive compounds are hazardous to the environment, posing a serious risk to human and animal health and the ecosystem. The primary goal of research was to compare the efficiency of UV/H2O2, photo-Fenton, electro (EO)/ UV/H2O2 processes at near-neutral pH (pH=6) on the degradation of nitramine explosives (NAs), such as hexogen (RDX), octogen (HMX), and tetryl (TET), in an aqueous solution. The effect of operational conditions, likely pH of the solution, initial H2O2 concentration, initial Fe2+ concentration, and solution temperature, was observed. The removal kinetics fit with first-order kinetics and were in the order: photo-Fenton >EO/UV/ H2O2 > UV/ H2O2. The results showed higher rate constant values for TET, RDX and HMX removal by UV/ H2O2 (k = 0.07778, 0.03791 and 0.03786 min-1), EO/UV/ H2O2 (k = 0.16599, 0.1475 and 0.08674 min-1) and photo-Fenton (k = 0.18018, 0.1501 and 0.09336 min-1) processes. Furthermore, TET, RDX and HMX were mineralized at 59.7%, 45.1%, and 25.1 %, respectively, under optimum conditions after 60 min of the photo-Fenton process. From the economic perspective, photo-Fenton only requires 2.132–4.113 kWh m-3 to completely reduce NAs. Finally, acute toxicity towards Vibrio fischeri was defeated after usage of near-neutral photo-Fenton. Thus, photo-Fenton at circum-neutral is promising for low-cost, eco-friendly and efficient processes for treating nitramine explosives in aqueous solutions.
Źródło:
Journal of Ecological Engineering; 2021, 22, 6; 232-243
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of solid and ionic surface reaction form to surface quality when using chemical-mechanical slurry polishing
Autorzy:
Duc, Le Anh
Hieu, Pham Minh
Mai, Nguyen Trong
Trong, Thai Van
Quang, Nguyen Minh
Powiązania:
https://bibliotekanauki.pl/articles/2171776.pdf
Data publikacji:
2022
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
chemical-mechanical slurry
polishing
abrasive particle
ionic surface reaction
yttrium aluminum garnet
surface roughness
Opis:
The process of removing machining residues using chemical-mechanical slurry (CMS) has an important place in the creation of ultra-precise components in optical devices. Based on this feature, this work investigates the efficiency of the CMS polishing process by comparing the surface reaction modes by the ionic and solid reaction modes when polishing the yttrium aluminum garnet (YAG) and sapphire crystal. The study procedures were conducted to clarify the polishing performance corresponding to these two reaction types. The obtained experiments results show that the balance between the mechanical effect process using CMS polishing technology with chemical effect can be achieved with the ionic reaction mode. The results also show that the ionic surface reaction modes give more uniform material removal than the solid reaction on YAG and sapphire crystal surfaces. Therefore, the surface quality when polished by CMS technology with ionic surface reaction modes is better than that of solid surface reaction.
Źródło:
Journal of Machine Engineering; 2022, 22, 4; 82--94
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of Nitramine Explosives in Aqueous Solution by UV-Mediated Advanced Oxidation Process in Near-Neutral Conditions
Autorzy:
Khue, Do Ngoc
Bach, Vu Quang
Binh, Nguyen Thanh
Minh, Do Binh
Nam, Pham Thi
Loi, Vu Duc
Nguyen, Hoa Thanh
Powiązania:
https://bibliotekanauki.pl/articles/1838360.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
hexogen
octogen
tetryl
UV
photo-Fenton
electrooxidation
near neutral
Opis:
Explosive compounds are hazardous to the environment, posing a serious risk to human and animal health and the ecosystem. The primary goal of research was to compare the efficiency of UV/H2O2, photo-Fenton, electro (EO)/ UV/H2O2 processes at near-neutral pH (pH=6) on the degradation of nitramine explosives (NAs), such as hexogen (RDX), octogen (HMX), and tetryl (TET), in an aqueous solution. The effect of operational conditions, likely pH of the solution, initial H2O2 concentration, initial Fe2+ concentration, and solution temperature, was observed. The removal kinetics fit with first-order kinetics and were in the order: photo-Fenton >EO/UV/ H2O2 > UV/ H2O2. The results showed higher rate constant values for TET, RDX and HMX removal by UV/ H2O2 (k = 0.07778, 0.03791 and 0.03786 min-1), EO/UV/ H2O2 (k = 0.16599, 0.1475 and 0.08674 min-1) and photo-Fenton (k = 0.18018, 0.1501 and 0.09336 min-1) processes. Furthermore, TET, RDX and HMX were mineralized at 59.7%, 45.1%, and 25.1 %, respectively, under optimum conditions after 60 min of the photo-Fenton process. From the economic perspective, photo-Fenton only requires 2.132–4.113 kWh m-3 to completely reduce NAs. Finally, acute toxicity towards Vibrio fischeri was defeated after usage of near-neutral photo-Fenton. Thus, photo-Fenton at circum-neutral is promising for low-cost, eco-friendly and efficient processes for treating nitramine explosives in aqueous solutions.
Źródło:
Journal of Ecological Engineering; 2021, 22, 6; 232-243
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Designing a compact firefighting vehicle for narrow residential areas on the base of a lawn mower
Autorzy:
Hong, Thong Duc
Truong, Phat Tan
Pham, Minh Quang
Tran, Lam Quang
Powiązania:
https://bibliotekanauki.pl/articles/27312358.pdf
Data publikacji:
2023
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
lawnmower
firefighting vehicle
drive mechanism
water spray
spraying pesticides
kosiarka
pojazd gaśniczy
mechanizm napędowy
opryskiwacz wodny
rozpylanie pestycydów
Opis:
With the explosion of urbanization, more and more small residential areas with high population density, tiny houses, and narrow roads are formed. As a result, it is challenging for large fire engines to penetrate these areas in the event of a fire incident. In this paper, a compact firefighting vehicle was designed based on the SNAPPER LT140H331KV lawn mower. The vehicle is equipped with a water sprayer system and a folding frame water tank. The water sprayer system transmits power from the lawn mower transmission’s power take-off shaft via the belt and chain drive, which can spray water at a height of about 13 m with a flow rate of 38 L/min. The 500-liter folding frame water tank has a rectangular shape that can be folded and dragged as a trailer. The water sprayer system and folding frame water tank not only have a simple, compact structure but also do not affect the lawn mowing function. This fire truck has a maximum speed of about 15 km/h and can move in a minimal road width of only 1.3 m, which is accommodation for residential areas within a 1÷2 km radius with narrow roads, high density of population and houses in least developed and developing countries (e.g., Vietnam, Laos, Cambodia), where the normal fire engines are difficult to access in time. Besides, the vehicle can be used for watering and spraying pesticides on gardens and small premises. The study has proposed a valuable solution to take advantage of vehicle functions to improve their convenience and usefulness.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 121; 107--126
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design optimization of compliant mechanisms for vibration assisted machining applications using a hybrid Six Sigma, RSM-FEM, and NSGA-II approach
Autorzy:
Pham, Huy-Tuan
Nguyen, Van-Khien
Dang, Quang-Khoa
Duong, Thi Van Anh
Nguyen, Duc-Thong
Phan, Thanh-Vu
Powiązania:
https://bibliotekanauki.pl/articles/24084644.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
compliant mechanism
multi-objective optimisation
Six Sigma
NSGA-II
Opis:
Vibration-assisted machining, a hybrid processing method, has been gaining considerable interest recently due to its advantages, such as increasing material removal rate, enhancing surface quality, reducing cutting forces and tool wear, improving tool life, or minimizing burr formation. Special equipment must be designed to integrate the additional vibration energy into the traditional system to exploit those spectacular characteristics. This paper proposes the design of a new 2-DOF high-precision compliant positioning mechanism using an optimization process combining the response surface method, finite element method, and Six Sigma analysis into a multi-objective genetic algorithm. The TOPSIS method is also used to select the best solution from the Pareto solution set. The optimum design was fabricated to assess its performance in a vibration-assisted milling experiment concerning surface roughness criteria. The results demonstrate significant enhancement in both the manufacturing criteria of surface quality and the design approach criteria since it eliminates modelling errors associated with analytical approaches during the synthesis and analysis of compliant mechanisms.
Źródło:
Journal of Machine Engineering; 2023, 23, 2; 135--158
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancing Workplace Safety: A Comprehensive Action Plan for Duong Huy Coal Company (2021– 2025)
Autorzy:
Nguyen, Thi Hoai Nga
Nguyen, Duc Thang
Le, Dinh Chieu
Le, Van Chien
Pham, Kien Trung
Powiązania:
https://bibliotekanauki.pl/articles/27323288.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
workplace safety
safety standards
safety solutions
extractive industries
Duong Huy coal company
bezpieczeństwo i higiena pracy
Wietnam
przemysł
Opis:
Workplace safety is of paramount importance in industries such as coal mining, where accidents and occupational illnesses can result in significant human and economic costs. This study aims to develop an action plan to improve safety standards at Duong Huy Coal Company from 2021 to 2025. A comprehensive survey involving 93 safety managers and 379 workers from various production sites was researched to gather insights and opinions on safety priorities. Focus group discussions and expert consultations were employed to assess the current safety situation, identify challenges, and develop coherent safety solutions. Based on the survey results, the proposed action plan focuses on the following objectives: reducing workplace accidents by 20-25% annually, progressing towards zero accidents in the following years, and increasing productivity and benefits for both workers and the company. The plan also emphasizes the role of company leadership in widely communicating their commitment to safety and the need for individual units within the company to proactively plan, budget, and implement safety measures following their functions and responsibilities. Collaboration with relevant state agencies, mass mobilization campaigns, and the application of science and technology in safety and occupational health will further contribute to the enhancement of workplace safety at Duong Huy Coal Company.
Źródło:
Inżynieria Mineralna; 2023, 2; 205--208
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of geometrical parameters of plastic bottle shredder blade utilizing a two-step optimization method
Autorzy:
Nguyen, Trieu Khoa
Chau, Minh Quang
Do, The-Can
Pham, Anh-Duc
Powiązania:
https://bibliotekanauki.pl/articles/1845034.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plastic waste
shredder blade
two-step optimization
Taguchi method
response surface method
odpady z tworzyw sztucznych
optymalizacja dwustopniowa
metoda Taguchi
metoda powierzchni odpowiedzi
Opis:
In this paper, a numerical and experimental investigation of geometrical parameters of the blade for plastic bottle shredder was performed based on the Taguchi method in combination with a response surface method (RSM). Nowadays, plastic waste has become a major threat to the environment. Shredding, in which plastic waste is shredded into small bits, ready for transportation and further processing, is a crucial step in plastic recycling. Although many studies on plastic shredders were performed, there was still a need for more researches on the optimization of shredder blades. Hence, a numerical analysis was carried out to study the influences of the relevant geometrical parameters. Next, a two-step optimization process combining the Taguchi method and the RSM was utilized to define optimal parameters. The simulation results clearly confirmed that the current technique can triumph over the limitation of the Taguchi method, originated from a discrete optimization nature. The optimal blade was then fabricated and experimented, showing lower wear via measurement by an ICamScope® microscope. Hence, it can be clearly inferred from this investigation that the current optimization method is a simple, sufficient tool to be applied in such a traditional process without using any complicated algorithms or expensive software.
Źródło:
Archive of Mechanical Engineering; 2021, LXVIII, 3; 253-269
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Choice of powered roof support FAZOS-15/31-POz for Vang Danh hard coal mine
Dobór obudowy zmechanizowanej typu FAZOS-15/31-POz dla podziemnej kopalni węgla kamiennego Vang Danh
Autorzy:
Skrzypkowski, Krzysztof
Korzeniowski, Waldemar
Duc, Trung Nguyen
Powiązania:
https://bibliotekanauki.pl/articles/318927.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
kopalnia podziemna
Wietnam
obudowa zmechanizowana
underground hard coal mines
Vietnam
powered roof support
Opis:
The article presents the choice of a Polish powered roof support from FAMUR Group for the conditions of one of the hard coal mines in Vietnam. In the analytical calculations, the strength and structural parameters of the rock mass from the Vang Danh mine region were adopted. The longwall face is 93 m long and the thickness of the coal layer is equal 3 m. For the needs of the choice of support, the load of the longwall face determined and the capacity of the powered roof support were determined. On the basis of the permissible roof deflection method, the condition of excavation maintenance was characterized. In the calculations, it was assumed that the condition of using a powered roof support type FAZOS-15/31-POz, except in addition to complying of the working range and permissible value of longwall face inclination, is to ensure proper roof maintenance conditions, which are determined by the index of load capacity of the roof „g”.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 175-182
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sulfur and lead isotope geochemical characteristics of Pb-Zn deposits in the Khau Loc zone, northeastern Vietnam, and their significance
Autorzy:
Hung, Khuong The
Tung, Ta Dinh
Binh, Do Quoc
Sang, Pham Nhu
Cuc, Nguyen Thi
Linh, Nguyen Thi Hoang
Tin, Quach Duc
Powiązania:
https://bibliotekanauki.pl/articles/2055848.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
lead-zinc
sulfur isotopes
lead isotopes
Khau Loc zone
northeastern Vietnam
Opis:
In northeastern Vietnam, the Khau Loc zone is considered to have high potential for lead-zinc mineralization. The lead isotope data for 18 galena samples and 18 ones of δ34S isotope data (including galena and pyrite samples) were collected from lead-zinc ore deposits in some areas in the Khau Loc zone, including Phia Dam, Khuoi Man, Ban Lin, Lung Dam, and Ta Pan. These were employed to investigate the sulfur and lead isotope geochemical characteristics of Pb-Zn deposits and their significance in this study. The samples were analyzed using the LA-ICP-MS to show that the Pb isotopic ratios of 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb in the galena samples range from 17.8908 to 18.6012, 15.5794 to 16.1025, 38.4420 to 39.2118, with the average values of 18.296, 15.749, and 38.812, respectively. The pyrite and galena samples had the δ34S isotope, ranging from 9.0 to 15.106. The sulfur isotope systematics implies that most of the lead-zinc ore formations originated from marine sedimentary evaporation deposits and magmatic intrusion-volcanic eruption sources rich in silica. The distribution of lead isotopic ratios had a well-defined cluster for each deposit, indicating the formation of lead-zinc deposits and lower crust and orogen trends. In addition, these findings of lead isotopic ratios and δ34S isotopes proved that the Khau Loc zone is an activated structure with continuous growth in continental crust thickness during the early Proterozoic and Cenozoic periods. Furthermore, the study results also presented the evolution of material sources involved in the formation of lead-zinc ores in the Khau Loc zone.
Źródło:
Geology, Geophysics and Environment; 2021, 47, 3; 143--157
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strategies for developing logistics centres: technological trends and policy implications
Autorzy:
Nguyen, Minh Duc
Ko, Tae Yeon
Rudzki, Krzysztof
Nguyen, Hoang Phuong
Pham, Nguyen Dang Khoa
Powiązania:
https://bibliotekanauki.pl/articles/34601208.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
logistics centers
logistics infrastructure
logistical services
smart technologies
Opis:
Logistics centres are currently performing a key function in the development of countries through their ability to regulate goods, markets, and transport. This is shown by the infrastructure, cost, goods flow, and quality of logistical services provided by these centres. Nevertheless, in developing nations or regions with antiquated logistics infrastructure, conventional logistics centres seem to struggle to manage the volume of commodities passing through them, resulting in persistent congestion and an unsteady flow of goods inside these facilities. This issue poses a challenge to the progress of any nation. The emergence of new technology offers a potential avenue to solve the problems inherent in traditional logistics centres. Most prominently, four technologies (the Internet of Things (IoT), Blockchain, Big Data and Cloud computing) are widely applied in traditional logistics centres. This work has conducted a thorough analysis and evaluation of these new technologies in relation to their respective functions and roles inside a logistics centre. Furthermore, this work proposes difficulties in applying new technologies to logistics centres related to issues such as science, energy, cost, or staff qualifications. Finally, future development directions, related to expanding policies in technological applications, or combining each country’s policies for the logistics industry, are carefully discussed.
Źródło:
Polish Maritime Research; 2023, 4; 129-147
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Znaczenie i wpływ języka postaci (yakuwarigo) na kształtowanie kompetencji językowych studentów japonistyki w Polsce
Yakuwarigo. A Brief Characteristic of Japanese Role Language from the Perspective of Japanese Language Education in Poland
Autorzy:
Duc-Harada, Patrycja
Powiązania:
https://bibliotekanauki.pl/articles/460050.pdf
Data publikacji:
2019
Wydawca:
Fundacja Pro Scientia Publica
Tematy:
język japoński
język stylizowany
świadomość socjolingwistyczna kompetencje językowe
edukacja językowa
japanese language
role language
sociolinguistic awareness
linguistic competences
language education
Opis:
Cel badań. Podstawowym celem badawczym niniejszego artykułu jest przedstawienie zjawiska japońskiego języka postaci (jap. yakuwarigo, ang. role language), określanego mianem języka fikcyjnego, z perspektywy nauczania języka japońskiego na polskiej japonistyce. Wpływ japońskich komiksów manga oraz animacji anime na rozwijanie kompetencji językowych studentów japonistyki, a także obecność języka postaci w dialogach występujących w podręcznikach do nauki współczesnej japońszczyzny stanowią interesujący punkt odniesienia do analizy aktualnych zdolności językowych i komunikacyjnych studentów. Metoda. Główną metodą badawczą jest sondaż diagnostyczny przeprowadzony wśród studentów pierwszego, drugiego i trzeciego roku studiów licencjackich japonistyki Uniwersytetu Jagiellońskiego. W badaniu uczestniczyło pięćdziesięciu siedmiu studentów. Naukowe zaplecze dla niniejszych badań stanowiły japońsko i angielskojęzyczne opracowania poświęcone zjawisku stylizacji językowej, przede wszystkim prace Satoshiego Kinsuiego, którego uznaje się za twórcę konceptu yakuwarigo. Wyniki. Pierwsze dwa pytania ankiety dotyczyły ogólnego zainteresowania studentów językiem japońskim, a także formami popkultury takimi jak komiksy, gry i animacje. Przeważająca większość studentów zadeklarowała zainteresowanie japońską mangą i anime. Celem drugiego pytania było zbadanie, którymi japońskimi zaimkami pierwszej i drugiej osoby studenci posługują się najczęściej podczas zajęć oraz poza zajęciami. W toku badania okazało się, że wybory studentów są często dyktowane stylizacją językową proponowaną przez japońskie podręczniki, komiksy i ulubione animacje. W trzecim pytaniu studenci mogli wykazać się wiedzą dotyczącą różnych form języka postaci, dopasowując podane wyrażenie do określonej roli. Zadanie to nie sprawiło im większych trudności. Celem ostatniego pytania było zbadanie ogólnej wiedzy i świadomości językowej studentów w zakresie opracowywanych materiałów, dokonanie oceny podręczników oraz wyrażenie swojego stosunku do wprowadzenia fragmentów japońskich komiksów i animacji do materiałów dydaktycznych. Studenci otwarcie skrytykowali nienaturalność tekstów zawartych w japońskich podręcznikach, a także wyrazili pozytywny stosunek do niestandardowych metod nauczania japońszczyzny. Wnioski. Wyniki badania wskazują, że język postaci w zasadniczym stopniu zostaje odzwierciedlony w mowie studentów japonistyki. W pozytywny i negatywny sposób wpływa na ich zdolności językowe. Z jednej strony, studenci, którzy interesują się japońskimi formami popkultury mają bogatszy zasób leksykalny i przewyższają kolegów pod względem kompetencji słuchowo-konwersacyjnych. Z drugiej strony niejednokrotnie popełniają błędy językowe i socjolingwistyczne, gdyż w rezultacie naśladowania postaci, nieświadomie ignorują ograniczenia wywołane przynależnością i charakterystyką bohatera. Co więcej, język postaci, opierając się na cechach wyrazistych i często przerysowanych w widocznym stopniu promuje myślenie stereotypowe, które zagraża obiektywnemu oglądowi i ocenie kultury japońskiej. Niezwykle istotna staje się zatem osoba nauczyciela, który korzystając z materiałów dostarczanych przez teksty popkultury ma za zadanie uzupełnić te informacje rzetelną i popartą faktami wiedzą językowo-kulturową. W związku z powyższym zasadniczą kwestią jest wprowadzenie fragmentów mangi i anime do edukacji językowej jako materiałów uzupełniających.
Aim. The aim of this paper is to introduce the problem of Japanese fictitious speech called yakuwarigo ‘role language’ from the linguistic perspective and its relevancy for foreign language education, in this case of Japanese language education in the Polish academic environment. The impact of Japanese comic books, as well as potential presence of fictitious speech in Japanese textbooks will be underlined in this study. Method. The research was conducted on the basis of the short survey analysis. The survey was carried out among Polish students of Jagiellonian University who are learning the Japanese language at bachelor degree level. The number of respondents was 57. The scientific background for the present research was based primarily on the works of Kinsui, who is regarded as a founder of the yakuwarigo concept. Results. The first question of the survey referred to the general interest of Polish students in the Japanese language and a tendency to learn it through Japanese comic books and animations. The second question revolved around the use of first and second pronouns inside and outside the classroom, in order to estimate the impact of Japanese fictitious speech on the language behaviors of students. In the third question the students were motivated to adjust Japanese role language examples to the particular character of the speaker. The last question examined the theoretical linguistic knowledge of the students and their awareness and attitude to the problem of fictitious speech. The students expressed their opinions on Japanese textbooks, as well as revealed their positive attitude towards non-standard methods of Japanese learning. Conclusions. Yakuwarigo is a type of fictionalized language occurring in novels, comics, movies and anime. It contains typical speech patterns used to reflect stereotypical features of the speakers, their attributes and social roles. An analysis of the survey results indicates the significance of the role language in foreign language learning. However, its influence might be both, positive or negative. Noticeable differences in the lexical, grammatical and phonetic layers of the women/men speech, elder/youth speech, standard/regional speech portrayed in Japanese pop culture influence students learning the Japanese language. Consequently, in some cases students tend to unknowingly copy peculiar speech patterns and use it inappropriately. Additionally, yakuwarigo is thought to promote stereotypical thinking about Japanese society. On the other hand, role language might be regarded as a rich source of lexicography and, with regard to Japanese animations it helps students to become familiar with Japanese pronunciation. With elaborate explanations and commentaries given by teachers, students may avoid making errors and using language inappropriately. Taking this into account, implementing yakuwarigo into Japanese language educations should be regarded as an effective tool for developing the sociolinguistic competences of students.
Źródło:
Ogrody Nauk i Sztuk; 2019, 9; 301-319
2084-1426
Pojawia się w:
Ogrody Nauk i Sztuk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applying Artificial Pillar to Replace the Coal Pillar Protecting Roadway to Increase Production Efficiency and Sustainable Development in the Vietnamese Coal Industry
Autorzy:
Dinh, Van Cuong
Nguyen, Anh Tuan
Tran, Van Thanh
Nguyen, Thi Hoai Nga
Duong, Duc Hai
Powiązania:
https://bibliotekanauki.pl/articles/2020898.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
coal pillar protecting roadways
coal loss
artificial pillar
underground mine
filary węglowe
górnictwo podziemne
ubytki węgla
Opis:
Vietnam's domestic coal production is growing fast and is expected to reach 68.9 million tons in 2030, nearly 1.5 times higher than today. Open-pit mines will gradually reduce production and close, and underground mining coal output will increase progressively year by year and take a leading role. Besides the investment in new mines to achieve these goals, it is necessary to maximize the coal reserve exploited annually of existing underground mine projects, which its coal reserve in pillars protecting roadways currently accounts for 12−15%. The further exploitation of this coal reserve will decrease the costs of preparation of underground mines and granting mining rights and depreciation of infrastructure assets. Moreover, it will help reduce the loss of non-renewable resources and contributing to the sustainable development of Vietnam’s coal industry.
Źródło:
Inżynieria Mineralna; 2021, 2; 587--597
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element model updating of steel-concrete composite bridge: A study case of the Ruri bridge in Vietnam
Autorzy:
Nguyen, Duc Cong
Salamak, Marek
Katunin, Andrzej
Gerges, Michael
Abdel-Maguid, Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/27312150.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
analiza drgań
akcelerometr
model elementów skończonych
uaktualnienie
most betonowy
optymalizacja roju cząstek
algorytm genetyczny
vibration analysis
accelerometer
finite element model
update
concrete bridge
particle swarm optimisation
genetic algorithm
Opis:
The study presents the finite element (FE) model update of the existing simple-spans steel-concrete composite bridge structure using a particle swarm optimisation (PSO) and genetic algorithm (GA) approaches. The Wireless Structural Testing System (STS-WiFi) of Bridge Diagnostic, Inc. from the USA, implemented various types of sensors including: LVDT displacement sensors, intelligent strain transducers, and accelerometers that the static and dynamic historical behaviors of the bridge structure have been recorded in the field testing. One part of all field data sets has been used to calibrate the cross-sectional stiffness properties of steel girders and material of steel beams and concrete deck in the structural members including 16 master and slave variables, and that the PSO and GA optimisation methods in the MATLAB software have been developed with the new innovative tools to interface with the analytical results of the FE model in the ANSYS APDL software automatically. The vibration analysis from the dynamic responses of the structure have been conducted to extract four natural frequencies from experimental data that have been compared with the numerical natural frequencies in the FE model of the bridge through the minimum objective function of percent error to be less than 10%. In order to identify the experimental mode shapes of the structure more accurately and reliably, the discrete-time state-space model using the subspace method (N4SID) and fast Fourier transform (FFT) in MATLAB software have been applied to determine the experimental natural frequencies in which were compared with the computed natural frequencies. The main goal of the innovative approach is to determine the representative FE model of the actual bridge in which it is applied to various truck load configurations according to bridge design codes and standards. The improved methods in this document have been successfully applied to the Vietnamese steel-concrete composite bridge in which the load rating factors (RF) of the AASHTO design standards have been calculated to predict load limits, so the final updated FE model of the existing bridge is well rated with all RF values greater than 1.0. The presented approaches show great performance and the potential to implement them in industrial conditions.
Źródło:
Archives of Civil Engineering; 2023, 69, 3; 425--443
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods to Estimate the Channel Delay Profile and Doppler Spectrum of Shallow Underwater Acoustic Channels
Autorzy:
Nguyen, Van Duc
Nguyen, Tien Hoa
Ho, Hoa Xuan Thi
Powiązania:
https://bibliotekanauki.pl/articles/176670.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
shallow underwater acoustic
channel parameters detection
channel delay profile
Doppler spectrum
Opis:
In this paper, we present the methods to detect the channel delay profile and the Doppler spectrum of shallow underwater acoustic channels (SUAC). In our channel sounding methods, a short impulse in form of a sinusoid function is successively sent out from the transmitter to estimated the channel impulse response (CIR). A bandpass filter is applied to eliminate the interference from out-of-band (OOB). A threshould is utilized to obtain the maximum time delay of the CIR. Multipath components of the SUAC are specified by correlating the received signals with the transmitted sounding pulse with its shifted phases from 0 to 2π. We show the measured channel parameters, which have been carried out in some lakes in Hanoi. The measured results illustrate that the channel is frequency selective for a Barrow band transmission. The Doppler spectrum can be obtained by taking the Fourier transform of the time correlation of the measured channel transfer function. We have shown that, the theoretical maximum Doppler frequency fits well to that one obtained from measurement results.
Źródło:
Archives of Acoustics; 2019, 44, 2; 375-383
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal vehicle route schedules in picking up and delivering cargo containers considering time windows in logistics distribution networks: A case study
Autorzy:
Le, Thi Diem Chau
Nguyen, Duy Duc
Oláh, Judit
Pakurár, Miklós
Powiązania:
https://bibliotekanauki.pl/articles/1839502.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
vehicle routing problem
logistics distribution network
time window
guided local search
tabu search
simulated annealing
problem trasowania pojazdów
sieć dystrybucji
okno czasowe
wyszukiwanie lokalne
symulowane wyżarzanie
Opis:
This study describes a pickup and delivery vehicle routing problem, considering time windows in reality. The problem of tractor truck routes is formulated by a mixed integer programming model. Besides this, three algorithms - a guided local search, a tabu search, and simulated annealing - are proposed as solutions. The aims of our study are to optimize the number of internal tractor trucks used, and create optimal routes in order to minimize total logistics costs, including the fixed and variable costs of an internal vehicle group and the renting cost of external vehicles. Besides, our study also evaluates both the quality of solutions and the time to find optimal solutions to select the best suitable algorithm for the real problem mentioned above. A novel mathematical model is formulated by OR tools for Python. Compared to the current solution, our results reduced total costs by 18%, increased the proportion of orders completed by internal vehicles (84%), and the proportion of orders delivered on time (100%). Our study provides a mathematical model with time constraints and large job volumes for a complex distribution network in reality. The proposed mathematical model provides effective solutions for making decisions at logistics companies. Furthermore, our study emphasizes that simulated annealing is a more suitable algorithm than the two others for this vehicle routing problem.
Źródło:
Production Engineering Archives; 2020, 26, 4; 174-184
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O polskiej szkole odbudowy i konserwacji zabytków
ON THE POLISH SCHOOL OF THE CONSERVATION AND OF HISTORICAL MONUMENTS
Autorzy:
Zachwatowicz, Jan
Powiązania:
https://bibliotekanauki.pl/articles/538808.pdf
Data publikacji:
1981
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
polska szkoła odbudowy i konserwacji zabytków
ochrona dóbr kultury w Polsce
przykłady zniszczeń i deprecjacji zabytków kultury polskiej
Viollet-le-Duc
konserwacja zabytków w krajach Europy
Alois Riegl
teoria Riegla
zasada „konserwować - nie restaurować”
Alfred Lauterbach
Opis:
The author considers a substantiation of the term „Polish conservation school” and describes stages of the development of the concept of conservation in Poland from the 18th century. He gives examples o f intentional damages and depreciation o f Polish historic monuments during annexations and also o f initiatives taken by conservators and historians. At that time one could see various trends to emerge in conservation methods displaying features of school, to mention only Viollet-le-Duc in France and A. Riegel in Austria. The methods met also a vivid response in Poland, which can be seen in the reconstruction o f the cathedral at Włocławek and of the Cloth Hall in Cracow. Of particular importance were the ideas o f A. Riegel, who showed moderation and tried to find compromise solutions. Such a rational restraint in establishing the direction of monuments conservation adjusted to the conditions and fate of historic monuments in Poland displayed, already at that time, features o f the Polish school favouring, first and foremost, care for a proper form and durability o f monuments o f the national culture and not ambitions o f architectural creativity. In 1918, after the regaining o f independence by Poland conservation services were established and the law on the protection of monuments was enforced in 1928. The definition o f a monument covered all kinds o f human activity and was not time-restricted. It was also then that works on the rebuilding o f monuments destroyed during the war were undertaken, with the main emphasis put to restore the splendour o f royal castles in Warsaw and in Cracow. The operative principle was „to preserve and not to restore” , although the majority o f European projects consisted in restoration. The Conservation Congress in Athens (1931) recommended to avoid the reproduction of destroyed monuments but it did not repudiate the process totally in view o f some inevitable events. The period of People’s Poland II came to an end in 1938 with the statement made by A. Lauterbach, a Polish art historian, who said that the fate o f Polish monuments during the war of 1914—1918 made it impossible to apply the principle „to preserve and not to restore” in its pure form and that restoration and even reproduction o f monuments was a must. After the World War II this statement assumed the form of a concrete work programme (the execution o f old town complexes in, i.a., Warsaw, Gdańsk, Poznań). In the opinion of renowned historians o f architecture (R. Pane) and theoreticians of conservation (W. Frodl) the rebuilding o f monuments in Poland after 1945 was an exceptional and political task. According to the author o f this article, because o f its exceptionality and particular conditions in which monuments were rebuilt, one can hardly talk about „the Polish school o f conservation” , as this is not a doctrine but an exception. A similar method was also used by the French to reconstruct the destroyed town o f Saint Malo. Polish monuments conservation boasts a long tradition of great efforts put into their protection, restoration and reconstruction. One could mention at this point (1) comprehensive studies accompanied by broad inventory works and monographic elaborations, (2) training o f personnel in various fields o f monuments conservation, (3) works on the revival of historic town centres, (4) the establishment in 1950 of the State Enterprise for Conservation of Art, and (5) permanent and active participation o f Polish representatives in international works (e.g. in ICOMOS). The author concludes that each school is linked with a definite philosophical doctrine which the Poles have not created but only applied the methods o f monuments conservation necessary in a given situation.
Źródło:
Ochrona Zabytków; 1981, 1-2; 4-10
0029-8247
Pojawia się w:
Ochrona Zabytków
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-step Homogenization of Poroelastic Properties of a Limestone
Dwu-etapowa homogenizacja właściwości poroelastycznych wapienia
Autorzy:
Trieu, Hung Truong
Nguyen, Ngoc Bien
Pham, Duc Tho
Vu, Minh Ngoc
Do, Ngoc Anh
Nguyen, Sy Tuan
Tran, Nam Hung
Nguyen, Thi Thu Nga
Powiązania:
https://bibliotekanauki.pl/articles/318822.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
oolitic limestone
tow-step homogenization
CSA
poro-elastic properties
differential self-consistent
wapień oolityczny
homogenizacja dwuetapowa
właściwości poroelastyczne
zróżnicowana spójność własna
Opis:
This study aims at deriving the effective poroelastic properties of the oolitic limestones based on the Hashin composite sphere assemblage (CSA) micromechanical theory. The microstructure of oolitic limestones generally exhibits an assemblage of grains (oolites) surrounded by a matrix. Grain and matrix are linked via the interfacial transition zone (ITZ). Pores exist in these three material phases (oolite, ITZ and matrix). A two-step homogenization method is proposed. The first step consists of upscaling the properties of each porous phase (i.e. porous oolite, porous ITZ and porous matrix) in which each phase contains two sub-phases including pore and solid. The differential self-consistent scheme is used for the first step. At the second step, the three different porous constituents (oolite, ITZ and matrix) are assembled in a CSA model. A mathematical analogy between thermoelasticity and poroelasticity is used to obtain the effective poroelastic properties. A comparison between the proposed model and test data on the oolitic limestone from Bourgogne (France) helps to calibrate the model parameters and to highlight the role of ITZ phase.
W artykule, przedstawiono wyniki badań efektywnych właściwości poroelastycznych wapieni oolitowych w oparciu o teorię mikromechaniczną złożonego zespołu kul Hashin (CSA). Mikrostruktura wapieni oolitycznych wykazuje generalnie zbiór ziaren (oolitów) otoczonych matrycą. Ziarno i matryca są połączone za pośrednictwem międzyfazowej strefy przejściowej (ITZ). W tych trzech fazach materiału (oolit, ITZ i matryca) istnieją pory. Zaproponowano dwuetapową metodę homogenizacji. Pierwszy etap polega na zwiększeniu skali właściwości każdej porowatej fazy (tj. Porowatego oolitu, porowatej ITZ i porowatej matrycy), w której każda faza zawiera dwie podfazy: porową i stałą. W pierwszym etapie zastosowano różnicowy schemat samouzgodnienia. Na drugim etapie trzy różne porowate składniki (oolit, ITZ i matryca) są składane w modelu CSA. Matematyczne analogie między termosprężystością a poroelastycznością są wykorzystywane do uzyskania efektywnych właściwości poroelastycznych. Porównanie proponowanego modelu z danymi testowymi dotyczącymi wapienia oolitycznego z Bourgogne (Francja) pomaga skalibrować parametry modelu i podkreślić rolę fazy ITZ.
Źródło:
Inżynieria Mineralna; 2020, 1, 2; 31-39
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface roughness investigation through interplay of cutting speed and thermal-assisted machining in high-speed machining of SKD11 steel
Autorzy:
Bui, Long-Vinh
Mac, Thi-Bich
Nguyen, Duc-Toan
Powiązania:
https://bibliotekanauki.pl/articles/28407323.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
surface roughness
high-speed milling
thermal-assisted machining
SKD11 steel
Opis:
This study aims to investigate the interplay between cutting speed and Thermal-Assisted Machining (TAM) concerning surface roughness during the high-speed machining of SKD11 steel. The integration of pre-cutting workpiece heating introduces a temperature factor that intricately affects surface roughness. The primary objective is to ascertain optimal speed and temperature ranges that synergistically enhance machining efficiency, curtail costs, and elevate surface quality. The experimental protocol initiates with room temperature milling of SKD11 steel, progressively elevating the temperature gradient to systematically appraise temperature's impact on surface roughness under both conventional and elevated cutting speeds. Subsequent experimentation, conducted within specific temperature thresholds, entails stepwise augmentation of cutting speed to elucidate the influence of high-speed conditions on surface roughness. The ensuing analysis meticulously examines the ramifications of distinct cutting speed intervals on surface roughness. Ultimately, the study furnishes pragmatic recommendations for judiciously selecting cutting speeds and heating temperature parameters across diverse machining scenarios.
Źródło:
Journal of Machine Engineering; 2023, 23, 4; 33--42
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and Mesoscopic Lattice Numerical Investigation of Increase of Chloride Diffusivity Coefficient during Uniaxial Loading Model
Eksperymentalne i mezoskopowe badanie numeryczne sieci krystalicznej wzrostu współczynnika dyfuzyjności chlorków podczas jednoosiowego modelu obciążenia
Autorzy:
Bui, Truong Son
Pham, Duc Tho
Tran, The Truyen
Nguyen, Thi Nu
Vu, Minh Ngoc
Powiązania:
https://bibliotekanauki.pl/articles/317898.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
lattice model
durability of concrete
coastal regions
chloride diffusion
model kratowy
trwałość betonu w regionach nadmorskich
dyfuzja chlorków
Opis:
This paper presents experimental and simulation results of the change in the chloride diffusion coefficient of concrete C40 (f’c=40 MPa) during axial loading. Test Method for Electrical Indication was used to measure the chloride diffusivity of the concrete sample during the axial loading. A mesoscopic lattice model is proposed to describe the variation of chloride diffusion coefficient versus damage variable. In such a model, the domain of material is discretized randomly by using Voronoi tessellation for the transport element and Delaunay triangulation for a mechanical element. At the mesoscale, the concrete is constituted by three phases: aggregate, cement paste and ITZ, in which aggregate is assumed to be elastic while cement matrix and ITZ are represented by a damage model with softening. The experimental and numerical results show that in the first stage, without crack (s < 40%smax), the chloride diffusion coefficient remains almost constant, however in the crack initiation and propagation stage (s = 60-80%smax) chloride diffusion coefficient increases significantly. An empirical power model is also proposed to describe the increase of the chloride diffusion coefficient versus stress level and damage variable.
W artykule przedstawiono wyniki doświadczalne i symulacyjne zmiany współczynnika dyfuzji chlorków betonu C40 (f’c = 40 MPa) podczas obciążenia osiowego. Do pomiaru dyfuzyjności chlorków próbki betonu podczas obciążenia osiowego wykorzystano metodę badania wskazań elektrycznych. Zaproponowano mezoskopowy model sieci krystalicznej w celu opisania zmiany współczynnika dyfuzji chlorków w funkcji zmiennej uszkodzenia. W takim modelu domena materiału jest dyskretyzowana losowo przy użyciu teselacji Voronoia dla elementu transportowego i triangulacji Delaunaya dla elementu mechanicznego. W mezoskali beton składa się z trzech faz: kruszywa, zaczynu cementowego i ITZ, w których zakłada się, że kruszywo jest elastyczne, natomiast osnowa cementowa i ITZ są reprezentowane przez model uszkodzenia ze zmiękczeniem. Wyniki eksperymentalne i numeryczne pokazują, że w pierwszym etapie, bez pęknięcia ((σ<40%σmax), współczynnik dyfuzji chlorków pozostaje prawie stały, natomiast w fazie inicjacji i propagacji pęknięcia (σ=60-80% σmax) współczynnik dyfuzji chlorków znacznie wzrasta. Zaproponowano również empiryczny model mocy opisujący wzrost współczynnika dyfuzji chlorków w funkcji poziomu naprężenia i zmiennej uszkodzenia.
Źródło:
Inżynieria Mineralna; 2020, 1, 2; 23-30
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Industry 4.0, lean management and organizational support : a case of supply chain operations
Przemysł 4.0, lean management i wsparcie organizacyjne : przypadek operacji łańcucha dostaw
Autorzy:
Tiep, Nguyen Cong
Oanh, Thai Thi Kim
Thuan, Tran Duc
Tien, Dinh Van
Ha, Thai Van
Powiązania:
https://bibliotekanauki.pl/articles/1826128.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska
Tematy:
supply chain operations reference model
Industry 4.0
lean management
organizational support
model odniesienia operacji łańcucha dostaw
Przemysł 4.0
szczupłe zarządzanie
wsparcie organizacyjne
Opis:
Currently, Industry 4.0 is considered as the essential improvement of business processes that could improve the lean management along with high organizational support and effective supply chain practices. Thus, the aim linked with the current article is to examine the role of Industry 4.0 in the business processes and its impact on lean management. The purpose also includes the investigation of mediation impact of supply chain operations reference model (SCORM) among the nexus of the role of Industry 4.0 in business process and lean management along with the examination of moderating role of organizational support among the nexus of SCORM and lean management. The researchers and questionnaires have selected the quantitative method of data collection have been used to gather the data from the respondents, while smart-PLS has been executed for analysis purpose. The results revealed that positive association had been found among the nexus of the role of Industry 4.0 in the business processes and lean management. The results also exposed that SCORM is positively mediating among the nexus of the role of Industry 4.0 in the business processes and lean management while organizational support positive moderated among the nexus of SCORM and lean management. These findings provided the guidelines to the policymakers that they should enhance their focus on the implementation of Industry 4.0 in the organization that could lead the organization towards success.
Obecnie Przemysł 4.0 uważany jest za zasadnicze usprawnienie procesów biznesowych, które mogłoby usprawnić szczupłe zarządzanie przy jednoczesnym wysokim wsparciu organizacyjnym i efektywnych praktykach łańcucha dostaw. Zatem celem związanym z niniejszym artykułem jest zbadanie roli Przemysłu 4.0 w procesach biznesowych i jego wpływu na lean management. Celem jest również zbadanie wpływu mediacyjnego modelu referencyjnego operacji łańcucha dostaw (SCORM) na splot roli Przemysłu 4.0 w procesach biznesowych i szczupłym zarządzaniu, wraz z badaniem moderującej roli wsparcia organizacyjnego w powiązaniu SCORM i lean zarządzanie. Badacze i kwestionariusze wybrali ilościową metodę zbierania danych, która została wykorzystana do zebrania danych od respondentów, natomiast smart-PLS został wykonany do analizy. Wyniki ujawniły, że pozytywny związek został znaleziony wśród splotu roli Przemysłu 4.0 w procesach biznesowych i szczupłym zarządzaniu. Wyniki pokazały również, że SCORM pozytywnie pośredniczy w powiązaniu roli Przemysłu 4.0 w procesach biznesowych i szczupłym zarządzaniu, podczas gdy wsparcie organizacyjne jest moderowane pozytywnie wśród powiązań SCORM i lean management. Ustalenia te dostarczyły wskazówek dla decydentów, że powinni oni skupić się na wdrażaniu Przemysłu 4.0 w organizacji, która może poprowadzić organizację do sukcesu.
Źródło:
Polish Journal of Management Studies; 2020, 22, 1; 583-594
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Management strategy for seaports aspiring to green logistical goals of IMO: technology and policy solutions
Autorzy:
Le, Thanh Tuan
Nguyen, Hoang Phuong
Rudzki, Krzysztof
Rowiński, Lech
Bui, Viet Duc
Truong, Thanh Hai
Le, Huu Cuong
Pham, Nguyen Dang Khoa
Powiązania:
https://bibliotekanauki.pl/articles/34605109.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
green seaport
management strategy
clean energy
decarbonization
sustainable Maritime
Opis:
Recently, because of serious global challenges including the consumption of energy and climate change, there has been an increase in interest in the environmental effect of port operations and expansion. More interestingly, a strategic tendency in seaport advancement has been to manage the seaport system using a model which balances environmental volatility and economic development demands. An energy efficient management system is regarded as being vital for meeting the strict rules aimed at reducing the environmental pollution caused by port facility activities. Moreover, the enhanced supervision of port system operating methods and technical resolutions for energy utilisation also raise significant issues. In addition, low-carbon ports, as well as green port models, are becoming increasingly popular in seafaring nations. This study comprises a comprehensive assessment of operational methods, cutting-edge technologies for sustainable generation, storage, and transformation of energy, as well as systems of smart grid management, to develop a green seaport system, obtaining optimum operational efficiency and environmental protection. It is thought that using a holistic method and adaptive management, based on a framework of sustainable and green energy, could stimulate creative thinking, consensus building, and cooperation, as well as streamline the regulatory demands associated with port energy management. Although several aspects of sustainability and green energy could increase initial expenditure, they might result in significant life cycle savings due to decreased consumption of energy and output of emissions, as well as reduced operational and maintenance expenses.
Źródło:
Polish Maritime Research; 2023, 2; 165-187
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Software Startups – A Research Agenda
Autorzy:
Unterkalmsteiner, M.
Abrahamsson, P.
Wang, X. F.
Nguyen-Duc, A.
Shah, S.
Bajwa, S. S.
Baltes, G. H.
Conboy, K.
Cullina, E.
Dennehy, D.
Edison, H.
Fernandez-Sanchez, C
Garbajosa, J.
Gorschek, T.
Klotins, E.
Hokkanen, L.
Kon, F.
Lunesu, I.
Marchesi, M.
Morgan, L.
Oivo, M.
Selig, C.
Seppänen, P.
Sweetman, R.
Tyrväinen, P.
Ungerer, C.
Yagüe, A.
Powiązania:
https://bibliotekanauki.pl/articles/953060.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
software startup
research agenda
software-intensive systems
Opis:
Software startup companies develop innovative, software-intensive products within limited time frames and with few resources, searching for sustainable and scalable business models. Software startups are quite distinct from traditional mature software companies, but also from micro-, small-, and medium-sized enterprises, introducing new challenges relevant for software engineering research. This paper’s research agenda focuses on software engineering in startups, identifying, in particular, 70+ research questions in the areas of supporting startup engineering activities, startup evolution models and patterns, ecosystems and innovation hubs, human aspects in software startups, applying startup concepts in non-startup environments, and methodologies and theories for startup research. We connect and motivate this research agenda with past studies in software startup research, while pointing out possible future directions. While all authors of this research agenda have their main background in Software Engineering or Computer Science, their interestin software startups broadens the perspective to the challenges, but also to the opportunities that emerge from multi-disciplinary research. Our audience is therefore primarily software engineering researchers, even though we aim at stimulating collaborations and research that crosses disciplinary boundaries. We believe that with this research agenda we cover a wide spectrum of the software startup industry current needs.
Źródło:
e-Informatica Software Engineering Journal; 2016, 10, 1; 89-123
1897-7979
Pojawia się w:
e-Informatica Software Engineering Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear postbuckling behavior of auxetic-core toroidal shell segments with Graphene reinforced face sheets under axial loads
Autorzy:
Nam, V. H.
Duc, V. M.
Doan, C. V.
Thanh Xuan, N. T.
Phuong, N. T.
Powiązania:
https://bibliotekanauki.pl/articles/38693072.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
axial compressive
tensile load
nonlinear buckling
graphene reinforced composite
auxetic-core
face sheet
toroidal shell segment
Opis:
The main aim of this paper is to provide an analytical approach for the nonlinear buckling behaviors of toroidal shell segments made by three layers included honeycomb auxetic-core and two Graphene reinforced face sheets under axial compressive or tensile loads. The auxetic core is designed in a honeycomb form and three distribution laws of Graphene are considered for two symmetric face sheets. The homogenization technique for honeycomb auxetic plates and shells is applied to establish the stiffness formulations of the core. By approximating the doubly curved coordinate to the simpler coordinate with the Stein and McElman assumption, the nonlinear basic equations are formulated using the nonlinear Donnell shell theory and the model of the two-parameter foundation. The Galerkin method can be performed three times for three states of buckling responses and the expressions of the load-deflection postbuckling curves can be determined. The numerical examinations present that the bifurcation buckling occurs with both axial tensile and compressive loads for convex and concave shells and the significantly beneficial effects of auxetic core and functionally graded Graphene reinforced face sheets on nonlinear buckling responses of shell segments.
Źródło:
Archives of Mechanics; 2022, 74, 2-3; 89-108
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safe Exploitation Solution and Reduction of Resources Loss for the L7 Seam at the West Wing Area of the 790 Open Pit Site of the Mong Duong Coal Mine
Bezpieczne rozwiązanie technologii i ograniczenie strat zasobów dla pokładu L7 na krawędzi zachodniego skrzydła odkrywki kopalni Mong Duong
Autorzy:
Pham, Duc Hung
Le, Tien Dung
Nguyen, VanQuang
Powiązania:
https://bibliotekanauki.pl/articles/319346.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
exploitation technology
mining solutions
water burst
technologia eksploatacji
straty zasobów
zagrożenie wodne
kopalnia Mong Duong
Opis:
In the next time, deepening exploitation and increasing capacity in underground mines are extremely necessary to meet the demand of using coal for developing economies. This problem is not only done in underground mines but also in areas that cannot be exploited by open-pit methods such as the open-pit edge. When exploiting deep underground mines, there are many difficulties for tasks such as: controlling ground pressure; ventilation; drainage, transportation etc. When cutting coal in longwall, it will create a goaf, causing a natural imbalance of stress in the ground, leading to the phenomenon of displacement of rock deformation and destruction of roadways, which creates a risk of unsafety labour. The L7 seam at the west wing area of the Mong Duong coal mine has an average thickness of 7m, an average slope angle of 15o, located near the edge of the 790 open pit site. According to the production plan, this mine will exploit this reservoir with blasting-drilling technology, longwall support by the semi-mechanized shield (self-moving hydraulic frame GK/1600/16/24/HTD). The preliminary assessment of hydrogeological conditions of the mine shows that this is a potential area with a high risk of water burst into the longwall. Until now this mine has not yet given a specific solution to this problem. Finding a reasonable mining solution to ensure production safety and reduce resources loss is extremely important problem not only for the Mong Duong coal mine but also for mines that have similar mining conditions of Vietnam National Coal – Mineral Industries Holding Limited (Vinacomin), Vietnam.
W ostatnich latach, w Wietnamie intensywnie prowadzono nie tylko rozbudowę i modernizację istniejących kopalń lecz także zagospodarowano nowe złoża na szeroką skalę. W górnictwie podziemnym istnieje wiele ważnych problemów technicznych, które należy rozwiązać, mianowicie: ciśnienie, wentylacja, trans-port podziemny, odwadnianie itp. Wykonanie wyrobiska powoduje zaburzenie początkowego stanu równowagi w górotworze nienaruszonym, skutkiem czego w otoczeniu wyrobiska zmieniają się naprężenia których wartość jest większa od naprężeń początkowych. Odprężenie górotworu w otoczeniu wyrobiska górniczego powoduje przemieszczanie się skał w kierunku pustej przestrzeni. Pokład L7 w zachodnim skrzydle kopalni Mong Duong ma średnią miąższość 7 m, średni kąt nachylenia 15 ° znajduje się w pobliżu krawędzi odkrywki 790. Zgodnie z planem wydobycia kopalni, zakład górniczy Mong Duong będzie kontynuować eksploatację tego pokładu z technologią wiercenia strzałowego, podparcie ściany za pomocą pół-zmechanizowanej osłony (samojezdna rama hydrauliczna GK / 1600/16/24 / HTD). Wyniki badań warunków hydrogeologicznych kopalni wskazują, że obszar badany jest potencjalny o dużym ryzyku wtargnięcia wody do ściany. W artykule, przedstawiono odpowiednie rozwiązania technologii wydobywczej, które zabezpieczają kopalnię przed zagrożeniem wodnym i ograniczy straty zasobów. Opracowana metoda jest zastosowana nie tylko dla kopalni Mong Duong, ale także i dla kopalń należących do Vinacomin, które mają podobne warunki górniczo-geologiczne.
Źródło:
Inżynieria Mineralna; 2020, 1, 2; 231-238
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aquatic Invertebrates and Their Correlation with Environmental Parameters in Coastal of Tien Giang Province, Mekong Delta in Vietnam
Bezkręgowce wodne i ich korelacja z parametrami środowiska na wybrzeżu prowincji Tien Giang, delta Mekongu w Wietnamie
Autorzy:
Nguyen, Thuy Lan Chi
Dang, Thi Cam Tu
Nguyen, Thi Ha
Nguyen, Binh An
Pham, Anh-Duc
Huynh, Phuc Lo
Powiązania:
https://bibliotekanauki.pl/articles/2172063.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
coastal area
aquatic invertebrates
physicochemical parameters
relationships
water quality assessment
obszary przybrzeżne
bezkręgowce wodne
parametry fizykochemiczne
zależności
ocena jakości wody
Opis:
The Tien Giang province is located in the tropical climate zone of the Mekong delta. The climate here is clearly divided into two main seasons, namely wet season and dry season and the average temperature is about 27°C. The coastline is 32 kilometers (20 mi) long with thousands of coastal warp, which is an advantage for aquatic breeding such as crab and sea-based economy development. Aquatic invertebrates are a diverse group of organisms that inhabit coastal area throughout the world, in regions spanning alpine, arid, Mediterranean, polar, temperate, and tropical climates. Estuarine coastal invertebrates include benthic, planktonic, and stygobitic taxa and range from widespread taxa to water quality assessment. Classified by size as either macroinvertebrates or smaller meiofauna, macroinvertebrates are more widely studied, although meiofauna can also be diverse and abundant in aquatic communities. The influence of environmental factors on the diversity of invertebrates was studied in the Tien Giang Coastal Area, Southern Vietnam. The study was done between March 2019 and September 2021, encompassing both dry and rainy seasons. Data from 10 sites were used as a representative example for the Tien Giang Coastal Area to conduct a qualitative study. To implement this evaluation, the analyses were based on MRC methods and classifications these improved by the scientific group. The biological and environmental variables were examined to test the analysis of variance (ANOVA) and the Pearson correlation among all the parameters using R statistical software. Significant or highly significant positive or negative correlations were assumed when the p-calculated value was < 0.05 or 0.01, respectively. The results of the assessment showed that 32 species of zooplankton and 18 species of benthic macroinvertebrates were found in the study area. The density of zooplankton at each site ranged from 6 to 85 individuals/sample, while the density of benthic macroinvertebrates at each site fluctuated from 4 to 15 individuals/sample. The calculated values for the diversity index (H’) of both zooplankton and benthic macroinvertebrates fluctuated at the average level (H’ ≈ 1.00 ÷ 1.72). The results also show that several environmental variables, including total suspended solid, chemical oxygen demand, and ammonium were correlated with species richness and density of aquatic invertebrates. The obtained results will be useful for the monitoring of pollution status at the study area in particular the sensitivity of aquatic invertebrates to changes of environmental characteristics.
Prowincja Tien Giang położona jest w strefie klimatu zwrotnikowego delty Mekongu. Klimat jest tutaj wyraźnie podzielony na dwie główne pory roku, a mianowicie porę deszczową i porę suchą, a średnia temperatura wynosi około 27°C. Linia brzegowa ma 32 kilometry (20 mil) długości i bardzo urozmaiconą linię brzegową, co jest zaletą dla hodowli wodnych, takich jak kraby i rozwój gospodarki morskiej. Bezkręgowce wodne to zróżnicowana grupa organizmów zamieszkujących obszary przybrzeżne na całym świecie, w regionach obejmujących klimat alpejski, suchy, śródziemnomorski, polarny, umiarkowany i tropikalny. Bezkręgowce przybrzeżne ujść rzek obejmują taksony bentosowe, planktonowe i stygobitowe, od szeroko rozpowszechnionych taksonów do oceny jakości wody. Klasyfikowane według wielkości jako makrobezkręgowce lub mniejsza meiofauna, makrobezkręgowce są szerzej badane, chociaż meiofauna może być również różnorodna i obfita w społecznościach wodnych. Wpływ czynników środowiskowych na różnorodność bezkręgowców badano na obszarze przybrzeżnym Tien Giang w południowym Wietnamie. Badanie zostało przeprowadzone w okresie od marca 2019 do września 2021, obejmując zarówno porę suchą, jak i deszczową. Dane z 10 miejsc wykorzystano jako reprezentatywny przykład dla obszaru przybrzeżnego Tien Giang do przeprowadzenia badania jakościowego. Aby przeprowadzić tę ocenę, analizy oparto na metodach MRC i klasyfikacjach, które zostały udoskonalone przez grupę naukową realizującą badania. Badano zmienne biologiczne i środowiskowe w celu przetestowania analizy wariancji (ANOVA) i korelacji Pearsona R między wszystkimi parametrami przy użyciu oprogramowania statystycznego. Przyjęto znaczące lub bardzo istotne dodatnie lub ujemne korelacje, gdy obliczona wartość p wynosiła odpowiednio <0,05 lub 0,01. Wyniki oceny wykazały, że na badanym obszarze stwierdzono występowanie 32 gatunków zooplanktonu i 18 gatunków makrobezkręgowców bentosowych. Zagęszczenie zooplanktonu na każdym stanowisku wahało się od 6 do 85 osobników/próbę, podczas gdy zagęszczenie makrobezkręgowców bentosowych na każdym stanowisku wahało się od 4 do 15 osobników/próbę. Obliczone wartości wskaźnika różnorodności (H’) zarówno zooplanktonu, jak i makrobezkręgowców bentosowych oscylowały na średnim poziomie (H’ ≈ 1,00 ÷ 1,72). Wyniki pokazują również, że kilka zmiennych środowiskowych, w tym całkowita zawiesina, chemiczne zapotrzebowanie tlenu i amon, było skorelowanych z bogactwem gatunkowym i gęstością bezkręgowców wodnych. Uzyskane wyniki będą przydatne do monitorowania stanu zanieczyszczenia badanego obszaru, w szczególności wrażliwości bezkręgowców wodnych na zmiany cech środowiska.
Źródło:
Inżynieria Mineralna; 2022, 2; 99--103
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Unmanned Aerial Vehicles for 3D topographic Mapping and Monitoring the Air Quality of Open-pit Mines
Wykorzystanie bezzałogowych statków powietrznych (dronów) do monitorowania jakości powietrza w odkrywkowych kopalniach węgla kamiennego
Autorzy:
Bui, Xuan‑Nam
Lee, Changwoo
Nguyen, Quoc Long
Adeel, Ahmad
Cao, Xuan Cuong
Nguyen, Viet Nghia
Le, Van Canh
Nguyen, Hoang
Le, Qui Thao
Duong, Thuy Huong
Nguyen, Van Duc
Powiązania:
https://bibliotekanauki.pl/articles/317913.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
drony
jakość powietrza
kopalnie odkrywkowe
unmanned aerial vehicles
air quality
open pit mines
Opis:
Recently remarkable advancement development of unmanned aerial vehicles (UAVs) has been observed and their applications have been shown in many fields such as agriculture, industry, and environmental management. However, in the mining industry, the application of UAV technology remains potential. This paper presents a low-cost unmanned aerial vehicle technology-based system for 3D mapping and air quality monitoring at open-pit mine sites in Vietnam. The system includes several dust sensors that are mounted on a low-cost rotary-wing type UAV. The system collects a variety of data, mainly images and airborne pollutant concentrations. To evaluate the performance of the proposed system, field tests were carried out at the Coc Sau coal mine. Based on the images transmitted to the ground monitoring station, large scale 3D topographic maps were successfully modeled. In addition, sensors mounted on the UAV system were able to monitor the levels of environmental variables associated with the air quality within the pit such as temperature, dust, CO, CO2, and NOx. The field test results in this study illustrate the applicability of the low-cost UAV for the 3D mapping and the air quality monitoring at large and deep coal pits with relatively high accuracy.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 223-239
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on some solutions for enlarging the application scope of the fully mechanized longwall coal mining technology according to seam dip angle at underground coal mines in Quang Ninh coalfield
Badanie kompleksowych rozwiązań w celu rozszerzenia zakresu zastosowania w pełni zmechanizowanej technologii eksploatacji węgla ścianowego zgodnie z kątem upadu pokładu w podziemnych kopalniach węgla w zagłębiu węglowym Quang Ninh
Autorzy:
Nguyen Duc, Trung
Korzeniowski, Waldemar
Skrzypkowski, Krzysztof
Pham Trung, Nguyen
Powiązania:
https://bibliotekanauki.pl/articles/318816.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
eksploatacja
węgiel
podziemne kopalnie węgla
exploitation
coal
underground coal mines
Opis:
The paper summarizes the applied experience, the technical solutions to limit the adverse effects of slope angle in the mechanized longwall mining at underground mines in the world. The paper proposes some solutions for enlarging the application field of the fully mechanized longwall mining technology according to seam dip angle at underground coal mines belonging to Vinacomin. In the article exploitation methods of coal seams of medium to thick thickness with dip angle above 20° designed for mechanized longwall were presented.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 28-35
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mjészëznë a jejich jãzëkji procëm krizisú. Antistigmatizacijni paket projektú „Jãzëkòvé antidotum: jãzëkòvô vjitalnosc jakò ôrt bùdacëjé psichicznégò dobrostanú, zdrovjô a zbalansovónégò rozvjicô”
Minorities and Their Languages in the Face of Crisis. Anti-Stigmatisation Package for the Project “Language as a Cure: Linguistic Vitality as a Tool for Psychological Well-Being, Health and Economic Sustainability” (in Kashubian)
Mniejszości i ich języki wobec kryzysu. Pakiet antystygmatyzacyjny projektu „Językowe antidotum: żywotność językowa jako sposób budowy psychicznego dobrostanu, zdrowia i zrównoważonego rozwoju”
Autorzy:
Olko, Justyna
Skrodzka, Magdalena
Chromik, Bartłomiej
Maryniak, Joanna
Bilewicz, Michał
Mirucka, Maria
Wypych, Michał
Jabłoński, Artur
Rzepka, Rafał
Maślana, Anna
Król, Tymoteusz
Duć-Fajfer, Olena
Bandur, Maciej
Gruda, Szymon
Wanot, Bartłomiej
Majerska-Sznajder, Justyna
Zaleska, Katarzyna
Małecka-Nowak, Natalia
Michna, Ewa
Wicherkiewicz, Tomasz
Powiązania:
https://bibliotekanauki.pl/books/11542944.pdf
https://bibliotekanauki.pl/books/11542944.epub
https://bibliotekanauki.pl/books/11542944.mobi
Data publikacji:
2023-09-11
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Opis:
Publikacja w języku kaszubskim, będąca efektem projektu „Językowe antidotum”, analizuje wpływ doświadczanej przez mniejszości etniczne i migrantów dyskryminacji na ich zdrowie i dobrostan, korzyści płynące z zachowania rdzennych języków i silnej tożsamości etnicznej oraz skutki pandemii dla tych grup. W pracy zawarto praktyczne rekomendacje i rozwiązania mające na celu poprawę warunków funkcjonowania grup mniejszościowych w Polsce, wsparcie dla dążeń do zachowania ich języków i kultury, przeciwdziałanie dyskryminacji i stygmatyzacji oraz budowanie lepszych relacji między mniejszościami etnicznymi a grupami większościowymi.
The publication in Kashubian, which is the result of the “Language as a Cure” project, analyses the influence of discrimination experienced by ethnic minorities and migrants on their health and well-being. It also looks at the benefits of preserving native languages and strong ethnic identity as well as the consequences of the pandemic for these groups. The books contains practical recommendations and solutions for improving the functioning of minority groups in Poland and supporting the efforts to preserve their languages and culture, preventing discrimination and stigmatization as well as building better relations between ethnic minorities and majorities.
Dostawca treści:
Biblioteka Nauki
Książka
    Wyświetlanie 1-93 z 93

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