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    Wyświetlanie 1-67 z 67
    Tytuł:
    Assessment of Change in Urban Green Spaces Using Sentinel 2 MSI Data and GIS Techniques: A Case Study in Thanh Hoa City, Vietnam
    Autorzy:
    Nguyen, Viet Nghia
    Trinh, Le Hung
    Nguyen, Thi Thu Nga
    Le, Thi Le
    Powiązania:
    https://bibliotekanauki.pl/articles/2020076.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    urban green space
    Weighted Urban Green Space Index
    Sentinel 2
    Thanh Hoa city
    strefa miejska
    Wietnam
    GIS
    Opis:
    This paper presents the results of an assessment of change in urban green spaces in Thanh Hoa city (Vietnam). Sentinel 2 MSI data in 2015 and 2021 are used to calculate 3 parameters: percentage of green, weight of green types, and weight of proximity to green. These parameters are used to calculate the Weighted Urban Green Space Index (WUGSI). The final result shows the distribution of green space in the study area consisted of very high-quality green, high-quality green, moderate quality green, and low quality green. The obtained results show that the quality of urban green space in Thanh Hoa city has changed significantly in the period 2015-2021, in which the area with category “low quality green space” increased from 7.17% up to 9.48%; areas with category “very high-quality green space” reduced from 65.02% to 47.39%.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 251--260
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitoring Vegetation Cover Changes by Sentinel-1 Radar Images Using Random Forest Classification Method
    Autorzy:
    Tran, Van Anh
    Le, Thi Le
    Nguyen, Nhu Hung
    Le, Thanh Nghi
    Tran, Hong Hanh
    Powiązania:
    https://bibliotekanauki.pl/articles/2020227.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    vegetation cover change,
    Sentinel-1
    Random Forest
    Binh Duong
    Vietnam
    Wietnam
    wegetacja
    Opis:
    Vietnam is an Asian country with hot and humid tropical climate throughout the year. Forests account for more than 40% of the total land area and have a very rich and diverse vegetation. Monitoring the changes in the vegetation cover is obviously important yet challenging, considering such large varying areas and climatic conditions. A traditional remote sensing technique to monitor the vegetation cover involves the use of optical satellite images. However, in presence of the cloud cover, the analyses done using optical satellite image are not reliable. In such a scenario, radar images are a useful alternative due to the ability of radar pulses in penetrating through the clouds, regardless of day or night. In this study, we have used multi temporal C band satellite images to monitor vegetation cover changes for an area in Dau Tieng and Ben Cat districts of Binh Duong province, Mekong Delta, Vietnam. With a collection of 46 images between March 2015 and February 2017, the changes of five land cover types including vegetation loss and replanting in 2017 were analyzed by selecting two cases, using 9 images in the dry season of 3 years 2015, 2016 and 2017 and using all of 46 images to conduct Random Forest classifier with 100, 200, 300 and 500 trees respectively. The result in which the model with nine images and 300 trees gave the best accuracy with an overall accuracy of 98.4% and a Kappa of 0.97. The results demonstrated that using VH polarization, Sentinel-1 gives quite a good accuracy for vegetation cover change. Therefore, Sentinel-1 can also be used to generate reliable land cover maps suitable for different applications.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 441--451
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    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:
    Copyright Protection for Works Created by AI Technology under the EU Law and Vietnamese Law
    Autorzy:
    Le Thi, Minh
    Powiązania:
    https://bibliotekanauki.pl/articles/40458021.pdf
    Data publikacji:
    2023
    Wydawca:
    Katolicki Uniwersytet Lubelski Jana Pawła II
    Tematy:
    European Union
    Copyright
    artificial intelligence
    Vietnamese intellectual property law
    Vietnamese copyright law
    Opis:
    The legislation of the European Union increasingly focuses on expanding the scope of works protected by intellectual property rights, including literary works, music, films, and phonograms. The breakthrough in artificial intelligence (AI) has contributed significantly to creating works of art with little or no human intervention. The article examines the current situation of EU copyright law and Vietnamese law regarding AI-generated works. The article concludes that EU law governs copyright for these works based on the extent of human contribution to the creation of the work. Meanwhile, Vietnamese law still needs to resolve the issue of intellectual property rights for works created by AI.
    Źródło:
    Review of European and Comparative Law; 2023, 55, 4; 7-28
    2545-384X
    Pojawia się w:
    Review of European and Comparative Law
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Professional value orientations of pedagogic students at universities in Northern Central region of Vietnam nowadays
    Zawodowa orientacja społeczna studentów pedagogiki na uniwersytetach północno-środkowego regionu współczesnego Wietnamu
    Autorzy:
    Le, Vu Thi Phuong
    Powiązania:
    https://bibliotekanauki.pl/articles/442240.pdf
    Data publikacji:
    2019-06-28
    Wydawca:
    Towarzystwo Wiedzy Powszechnej w Szczecinie
    Tematy:
    values
    value orientation
    professional value
    teaching profession
    pedagogic students
    wartości
    orientacja społeczna
    wartość zawodowa
    zawód nauczyciela
    studenci oświaty lub pedagogiki
    Opis:
    Pedagogic students or educational students are a particular social class – those who will consider teaching as a profession. Teaching is a very important career because it creates talents who are the nation’s most valuable resource. The future of education of one nation depends greatly on this team. The article made a survey on the professional value orientation (VO) of educational students at Vinh University and Hue University’s College of Education (HUCE) – the two oldest universities in the North Central region of Vietnam. Survey data were processed by mathematical statistics method, mainly calculating the percentage of responses to each item in the questionnaires, which provided the basis for judgments on the characteristics of professional value orientation of current pedagogic students at universities in North Central region of Vietnam; then, helps education institutions find appropriate ways and methods of impacting to maximize the strength of professional teachers in our country’s education.
    Studenci pedagogiki lub oświaty są szczególną klasą społeczną: to ci, którzy rozważają podjęcie pracy nauczyciela. Nauczanie to bardzo ważna ścieżka kariery, ponieważ stwarza talenty, które są najcenniejszym narodowym źródłem. Przyszłość edukacji każdego narodu zależy w wielkiej mierze właśnie od nich. W artykule zaprezentowano ankietę poświęconą zawodowej orientacji społecznej (value orientation, VO) studentów oświaty na Vinh University oraz Hue University’s College of Education (HUCE) – dwóch najstarszych uniwersytetach w północno-środkowym regionie Wietnamu. Dane z ankiety zostały przetworzone za pomocą metod statystycznych, głownie poprzez obliczanie procentowego poziomu odpowiedzi na każde pytanie ankiety, co dostarczyło podstaw do wyciągnięcia wniosków na temat charakterystyki zawodowej orientacji społecznej dzisiejszych studentów pedagogiki na uniwersytetach północno-środkowego regionu Wietnamu. Pomaga to także instytucjom edukacyjnym znaleźć właściwe kierunki i metody oddziaływania w celu zmaksymalizowania siły zawodowych nauczycieli w naszej krajowej edukacji.
    Źródło:
    Edukacja Humanistyczna; 2019, 1; 135-152
    1507-4943
    Pojawia się w:
    Edukacja Humanistyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessing Impacts of Mining Activities on Land Use/Land Cover Change Using Remote Sensing and GIS Techniques: A Case Study in Campha City, Vietnam
    Autorzy:
    Le, Thi Thu Ha
    Powiązania:
    https://bibliotekanauki.pl/articles/2020236.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    land use/land cover change
    mining activities
    remote sensing
    GIS
    górnictwo
    Wietnam
    Opis:
    Coal is one of the most mining commodities to date, especially to supply both national and international energy needs. Coal mining activities that are not well managed will have an impact on the occurrence of environmental damage. The present study was undertaken to analyze the process of humaninduced landscape transformation in the coal mines affected areas of Cam Pha, northeast Vietnam by interpreting temporal remote sensing data and using Geographic Information System. This experiment revealed that most of the study area was dominated by forest in all the time sequence period. The forest cover has decreased about 21.3%, meanwhile having nine fold increase in mining area from 1990 to 2020. The forest area lost during the study period was 7983.45 ha due to land cover conversion into mining area. The mining activities were also detrimental to the bare land and water body cover. The results of this study are expected to be used to support government efforts and mining managers in post-mining coal activities.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 467--477
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inclusive education policy and assurance of the quality of learning for children with disabilities
    Polityka edukacji włączającej z zapewnienie jakości nauczania dzieci niepełnosprawnych
    Autorzy:
    Hang, Le Thi Thuy
    Powiązania:
    https://bibliotekanauki.pl/articles/903627.pdf
    Data publikacji:
    2018-05-18
    Wydawca:
    Akademia Pedagogiki Specjalnej im. Marii Grzegorzewskiej. Wydawnictwo APS
    Tematy:
    osoby niepełnosprawne
    edukacja włączająca
    polityka
    jakość
    Wietnam
    persons with disabilities
    inclusive education
    policy
    quality
    Vietnam
    Opis:
    Artykuł poświęcony jest analizie sytuacji edukacyjnej uczniów niepełnosprawnych w Wietnamie. Autor dokonuje przeglądu aktów prawnych dotyczących edukacji włączającej, a także przedstawia badania, których celem było określenie poziomu przygotowania nauczycieli przedszkolnych oraz szkolnych z czterech regionów kraju do pracy w ramach edukacji inkluzyjnej. Wyniki badań porównano z danymi zgromadzonymi poprzez bezpośrednią obserwację nauczycieli pracujących w placówkach włączających. Okazało się, że deklarowany poziom przygotowania z zakresu edukacji inkluzyjnej nie pokrywa się z rzeczywistymi kompetencjami nauczycieli, którzy zawyżali stopień swojego doświadczenia w pracy inkluzyjnej z uczniami niepełnosprawnymi. Autor formułuje szereg zaleceń, których celem jest poprawa jakości edukacji uczniów ze specjalnymi potrzebami edukacyjnymi w Wietnamie.
    The article analyzes the educational situation of students with disabilities in Vietnam. The author reviews legal acts regarding inclusive education. He also presents research aiming to determine the preparation level of preschool and school teachers in four Vietnamese regions to work in inclusive education. The results of the survey were compared with data obtained through direct observation of teachers’ work in inclusive settings. It turned out that the declared level of teachers’ preparation for inclusive education did not coincide with their real competences. Teachers overstated their degree of preparation to work in inclusion with students with disabilities. The author formulates a number of recommendations that are intended to improve the quality of education for students with special educational needs in Vietnam.
    Źródło:
    Szkoła Specjalna; 2018, LXXIX(2); 124-135
    0137-818X
    Pojawia się w:
    Szkoła Specjalna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Fiber Crackers Supplemented with Asparagus Hard-Stem: Impacts of Supplementation Ratios and Water Amounts in Cracker Recipe on the Product Quality
    Autorzy:
    Tran, Thi Thu Tra
    Ngo, Le Hong Ngoc
    Ton, Nu Minh Nguyet
    Le, Thi Hong Nhung
    Le, Thi Thuy
    Le, Van Viet Man
    Powiązania:
    https://bibliotekanauki.pl/articles/31341115.pdf
    Data publikacji:
    2024-05-17
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    antioxidant capacity
    Asparagus officinalis L
    color parameters
    consumer acceptability
    dietary fiber
    hardness
    Opis:
    Spears or cladophylls are edible parts of asparagus (Asparagus officinalis L.) implemented in a human diet while its hard-stem by-products have been used for animal feeding. In this study, the asparagus hard-stem was proved to be rich in dietary fiber and total phenolics with high antioxidant capacity. Wheat flour was partially replaced by asparagus hard-stem powder (AHP) in the cracker recipe and the AHP ratios were 0 (control), 5, 10, 15, 20% of the blend weight; the nutritional constituents, antioxidant capacities, physical attributes, and sensory overall acceptability of crackers were then evaluated. As the AHP ratio increased from 0 to 20%, the dietary fiber and total phenolic contents of the fortified crackers were improved by 5.0 times and 3.2 times, respectively, while their ferric reducing antioxidant power and DPPH scavenging capacity were enhanced by 6.1 and 1.4 times, respectively. Besides, the elevated ratio of AHP also increased the product hardness and reduced its overall acceptability. The impacts of water amount used in the dough kneading on the high-fiber cracker quality were then investigated. At 20% AHP level, the appropriate water amount was 55 g/100 g of the flour blend to reduce hardness and improve overall acceptability of the fortified crackers. The study results show that AHP is a potential dietary fiber and antioxidant ingredient for high-fiber cracker making.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2024, 74, 2; 162-168
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Circular Economy Model and the Implementation in Vietnamese Coal Mining Industry
    Autorzy:
    Le, Dinh Chieu
    Dong, Thi Bich
    Powiązania:
    https://bibliotekanauki.pl/articles/2020223.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    circular economy model
    Vietnamese coal mining industry
    sustainable development
    Wietnam
    przemysł górniczy
    ekonomia
    Opis:
    The circular economy is the economic model that has been applied for a long time in the world. This model is applied at all three levels: micro (enterprise-level), intermediate (industry level, industrial zone level), and macro-level (local level, regional level, or national level). Vietnamese Coal Mining Industry has been having important contributions to the socio-economic development of Vietnam. However, this industry also causes lots of issues about environmental pollution. In the context of resource depletion, environmental pollution and the cost of exploiting and processing increases with the deep exploiting process; the tastes of utilizing resources, minimizing environmental pollution, and creating more value-added for this industry are inevitable requirements. Because of the tasks, applying the circular economy model into this industry (both intermediate and micro-level) is the urgent solution for the sustainable development of the Vietnamese Coal Mining Industry. The paper uses a combination of research methods such as theoretical research, case study research, statistical data analysis, etc., to propose the circular economy model for the Vietnamese Coal Mining Industry and some solutions to deploy this model into the industry's operations towards sustainable development.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 433--439
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Triggering students’ learning autonomy using the combination of m-learning and gamification: a case study at Nguyen Tat Thanh University
    Autorzy:
    Le Nhat Pham, Linh
    Tan Nguyen, Hoang
    Thi Kieu Le, Van
    Powiązania:
    https://bibliotekanauki.pl/articles/2085224.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej w Lublinie. IATEFL Poland Computer Special Interest Group
    Tematy:
    gamification
    m-learning
    learner autonomy
    language teaching
    Opis:
    M-learning is usually thought of as based on videos, digital materials, and high technology. Nonetheless, it is not a complete perspective of this new educational trend. Mobile devices with many functions can be an effective tool to support learning. Furthermore, learners nowadays, who were born in the 4.0 movement, are more familiar with mobile devices than notebooks. They spend much time on their mobile phones interacting on social media and playing mobile games. Hence, if educators can integrate those interests into traditional lesson plans, added value would appear for learners’ academic performance and learner autonomy. This paper proposes the idea of combining m-learning, gamification, and other factors influencing learning motivation into a mobile application to reinforce students’ learner autonomy. With a case study at Nguyen Tat Thanh University, we take a closer look at the effectiveness of the application on students’ language acquisition and a detailed description of how to best use the application along with lessons at schools. Using experimental methods with surveys and tests, this paper draws a bonding connection between students’ personal interest in the subject and their performance. The study provides thoughtful insights into utilizing m-learning and gamification to improve students’ learner autonomy and modernize language learning classrooms in this technological context.
    Źródło:
    Teaching English with Technology; 2021, 21, 2; 66-91
    1642-1027
    Pojawia się w:
    Teaching English with Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Industrial Symbiosis Applied to Vietnam Coal Mining Industry to Promote the Circular Economic Model towards Sustainable Development Goals
    Autorzy:
    Le, Dinh Chieu
    Nguyen, Nga
    Dong, Thi Bich
    Le, Minh Thong
    Powiązania:
    https://bibliotekanauki.pl/articles/25212155.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    coal mining industry
    industrial symbiosis
    circular economy model
    sustainable development
    górnictwo
    rozwój zrównoważony
    Wietnam
    Opis:
    Industrial symbiosis associated with the eco-industrial parks is the cooperative activities between businesses to optimize using of inputs and outputs such as raw materials, energy, water, waste materials, etc. in the orperation of businesses. In the industrial symbiosis model, the overall benefits of the symbiosis activities are more than the ones when working individually. Applying the model could help to reduce the demand of raw materials and increase the waste that be treated – an important part of the circular economy model. The coal mining industry includes many different stages from exploration, exploitation, processing, and trading. Each stage could be performed by different businesses which could corporate with each other. Besides the contributions to the socio-economic development, the industry also emits lots of waste into the environment to cause environmental pollution that needs to be treated. The paper summarizes the theoretical basis of the industrial symbiosis, the circular economy and clarifies the relationship between the industrial symbiosis, the circular economy and the sustainable development goals. From analyzing some typical situations of industrial symbiosis activities in Vietnamese coal mining industry; analyzing some characteristics and potential application of industrial symbiosis in the industry, the paper proposes the model of industrial symbiosis for Vietnamese coal mining industry. The paper also proposes some solutions to promote symbiotic activities in the industry.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 57--63
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finding out labor division in coastal fishery households of Nghi Son commune, Tĩnh Gia district, Thanh Hóa province
    Rozpoznanie podziału pracy w rybackich gospodarstwach domowych w gminie Nghi Son, dystrykt Tĩnh Gia w prowincji Thanh Hóa
    Autorzy:
    Nguyen, Le Quoc
    Duong, Nguyen Thi Thuy
    Powiązania:
    https://bibliotekanauki.pl/articles/442348.pdf
    Data publikacji:
    2017-06-30
    Wydawca:
    Towarzystwo Wiedzy Powszechnej w Szczecinie
    Tematy:
    gender division
    division of labor
    households
    case study
    podział płci
    podział pracy
    gospodarstwa domowe
    studium przypadku
    Opis:
    With the aim of focusing on clarifying gender division of labor in fisherfolk households in Tĩnh Gia district, Thanh Hóa province, the research uses qualitative research and quantitative research methods from data survey on the topic of “Labor division in coastal fishery households of Thanh Hóa province – case study in Nghi Son commune, Tĩnh Gia district, Thanh Hóa province” in 2016. From this the researchers study household economic development and activities to maintain relationships between family members with the community and society in the study area.
    W celu skoncentrowania się na uściśleniu podziału pracy ze względu na płeć w gospodarstwach domowych rybaków w dystrykcie Tĩnh Gia, w prowincji Thanh Hóa, wykorzystane zostały wyniki badań jakościowych i ilościowych. Badania na temat „Podział pracy w gospodarstwach przybrzeżnych rybołówstwa w prowincji Thanh Hóa – studia przypadków w gminie Nghi Son, dystrykt Tĩnh Gia w prowincji Thanh Hóa” przeprowadzone zostały w 2016 roku. Naukowcy badają rozwój gospodarczy gospodarstw domowych i działania mające na celu utrzymanie relacji między członkami rodziny a społeczeństwem w zakresie objętym badaniami.
    Źródło:
    Edukacja Humanistyczna; 2017, 1; 153-160
    1507-4943
    Pojawia się w:
    Edukacja Humanistyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use and Potential Impacts of Pesticides in Chili Farming in the Thanh Binh District, Dong Thap Province, Vietnam
    Autorzy:
    Mi, Le Thi Diem
    Giao, Nguyen Thanh
    Powiązania:
    https://bibliotekanauki.pl/articles/2173321.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    frequency
    chili farming
    potential risk
    pesticides
    Dong Thap province
    Opis:
    The study aimed to evaluate the current status and potential risks of pesticide use of 23 chili growing households in the Thanh Binh district, Dong Thap province, Vietnam. The result shows that farmers used a total of 40 commercial pesticide names with 43 active ingredients, of which two active ingredients, i.e. Benomyl and Fipronil, were banned. The frequency of pesticide spraying for chili protection averaged at 8.93 times/crop, for weed control at 1.83 times/crop, for pests at 12.43 times/crop, for disease control at 14.48 times/crop and for chili growth promoting at 4.82 times/crop. Farmers sprayed pesticides with higher doses than recommended on the labels when pests and diseases occurred on chili farm. The active ingredients in powder and liquid pesticides of Mancozeb, Metalaxyl, Propined, Difenoconazole, Abamectin and Azoxystrobin have been frequently used with estimated concentrations of 5023±3886.36, 337.71±237.50, 4093.92±3628.57, 289.27±264.73, 31.60±29.02 and 652.57±468.35 g/L/ha, respectively. The predicted amounts of ineffective use of such pesticides as Benomyl, Cypermethrin, Fosetylaluminium, Propiconazole, Tebuconazole, Buprofezin, Chlorfenapyr and Difenoconazole, could pose great risks to the environment and humans. Burning is the main method chosen by chili farmers in the treatment of pesticide packaging after use. The study suggests local environmental managers should train farmers in the use and management of pesticide wastes more appropriately.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 8; 1--11
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Institutional and psychological barriers to entrepreneurial intention of Vietnamese youth
    Instytucjonalne i psychologiczne bariery intencji przedsiębiorczości młodzieży wietnamskiej
    Autorzy:
    To, Anh Tho
    Le, Thi Nhu Thuyen
    Powiązania:
    https://bibliotekanauki.pl/articles/2147300.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    intencja przedsiębiorcza
    bariery instytucjonalne
    bariery psychologiczne
    entrepreneurial intention
    barriers institutional
    barriers psychological
    Opis:
    Understanding entrepreneurial intention is critical for forecasting future entrepreneurship activities that may be beneficial to achieving economic goals. Along with the numerous opportunities available to entrepreneurs, numerous obstacles impede individuals from pursuing their entrepreneurial dreams. This study aims to define psychological and institutional barriers to entrepreneurial intention. An online questionnaire was administered to 305 Vietnamese youth between the ages of 18 and 30 at Ho Chi Minh City in Vietnam. Using the statistical software SPSS 20.0, the results show that financial barriers, market barriers, knowledge barriers, fear of failure, risk aversion, and stress avoidance may hinder their entrepreneurial inclination. Compared with the barriers faced by experienced entrepreneurs, the barriers faced by the youth may also exhibit different dimensions. This finding provides a useful model for measuring barrier awareness towards entrepreneurial intention, which could help to reduce Vietnamese youth’s perceived difficulties of becoming an entrepreneur.
    Zrozumienie intencji przedsiębiorczych ma kluczowe znaczenie dla prognozowania przyszłych działań przedsiębiorczych, które mogą być korzystne dla osiągnięcia celów ekonomicznych. Wraz z licznymi możliwościami dostępnymi dla przedsiębiorców, liczne przeszkody utrudniają ludziom realizację ich przedsiębiorczych marzeń. Niniejsze badanie ma na celu zdefiniowanie psychologicznych i instytucjonalnych barier dla przedsiębiorczych zamiarów. W Ho Chi Minh City w Wietnamie objęto badaniem 305 respondentów wśród młodzieży wietnamskiej w wieku od 18 do 30 lat przy wykorzystaniu kwestionariusza internetowego. Korzystając z oprogramowania statystycznego SPSS 20.0, wyniki pokazują, że bariery finansowe, rynkowe, wiedzy, strach przed porażką, awersja do ryzyka i unikanie stresu mogą hamować ich skłonność do przedsiębiorczości. W porównaniu z barierami, z jakimi borykają się doświadczeni przedsiębiorcy, bariery, z jakimi boryka się młodzież, mogą mieć również inny wymiar. To odkrycie stanowi przydatny model pomiaru świadomości barier w stosunku do intencji przedsiębiorczych, który może pomóc zmniejszyć postrzegane trudności wietnamskiej młodzieży związane z zostaniem przedsiębiorcą.
    Źródło:
    Polish Journal of Management Studies; 2021, 24, 1; 428--440
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D LoD3 Modeling of High Building Using Terrestrial Laser Scanning and Unmanned Aerial Vehicle: A Case Study in Halong City, Vietnam
    Autorzy:
    Le, Thi Thu Ha
    Nguyen, Quoc Long
    Powiązania:
    https://bibliotekanauki.pl/articles/27323222.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    3D LoD3 model of high building
    Unmanned Aerial Vehicle (UAV)
    Terrestrial Laser Scanners (TLS)
    UAV
    skaning laserowy
    Wietnam
    Opis:
    3D urban building models play an important role in the association, convergence and integration of economic and social urban data. 3D building reconstruction can be done from both the lidar and image-based point clouds, however, the lidar point clouds has dominated the research giving the 3D buildings reconstruction from aerial images point clouds less attention. The UAV images can be acquired at low cost, the workflow can be automated with minimal technical knowhow limitation. This promotes the necessity to understand and question to what extent the 3D buildings from UAV point clouds are complete and correct from data processing to parameter settings. This study focuses on proposing a process for building 3D geospatial data for a smart city using geospatial data collected by UAV and Terrestrial Laser Scanner. The experimental results have produced 3D geospatial data of high building in LoD3, with the root mean square error of the received test points mΔx=3.8 cm, mΔy=3.1 cm, and mΔH=7.5 cm.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 303--310
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Space law in Vietnam: outer space policy, legal development and its future pathway
    Autorzy:
    Khanh Linh, Le Thi
    Anh, Hoang Thao
    Dieu Ha, Tran Thi
    Lan Phuong, Nguyen Luu
    Thuy Nhi, Le Thi
    Powiązania:
    https://bibliotekanauki.pl/articles/2127985.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Metropolitalny
    Tematy:
    Przestrzeń kosmiczna
    polityka
    prawo
    przyszła droga
    współpraca międzynarodowa
    Wietnam
    Outer space
    policies
    laws
    future pathway
    international cooperation
    Vietnam
    Opis:
    Chociaż Wietnam uczestniczył w licznych operacjach kosmicznych, współpracując z wieloma narodami z całego świata, prawna regulacja sektora kosmicznego jest wciąż w powijakach. W artykule przedstawiono rozwój polityki i prawa kosmicznego, a także współpracy międzynarodowej w zakresie wykorzystania przestrzeni kosmicznej w Wietnamie od 1979 roku do chwili obecnej, z punktem zwrotnym w 2006 roku. Autorzy wskazali także kilka prognoz dotyczących przyszłej ścieżki wietnamskiego prawa kosmicznego w nowej erze, liczonej od 2020 roku.
    Although Vietnam has participated in numerous outer space operations with many nations worldwide, its legal system in this sector is still in its infancy and consequently has several restrictions. More specifically, this article investigates the establishment and evolution of policies, laws, and international cooperation regarding the utilization of outer space in Vietnam from 1979 to the present, with the turning point in 2006. The authors then give some predictions concerning the future pathway of Vietnamese space law in the new age from 2020.
    Źródło:
    Ad Astra. Program badań nad astropolityką i prawem kosmicznym; 2022, 5; 4-13
    2720-4456
    Pojawia się w:
    Ad Astra. Program badań nad astropolityką i prawem kosmicznym
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Technological Solutions to Increase the Recovery and Quality of the Copper Concentrate at Ta Phoi Beneficiation Plant in Vietnam
    Autorzy:
    Nhu, Thi Kim Dung
    Pham, Thi Nhung
    Vu, Thi Chinh
    Le, Viet Ha
    Powiązania:
    https://bibliotekanauki.pl/articles/27323292.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    copper concentrate
    optimization
    reagent regime
    flotation flowsheet
    miedź
    złoża
    Wietnam
    Opis:
    The Ta Phoi beneficiation plant is one of the main copper beneficiation plants in Vietnam. The plant has been put in operation since 2019 and annually process more than one million tons of ROM copper ore to collect 32 thousand tons of copper concentrate of 23% Cu. In the first years of operation the plant’s metallurgical performance has not been consistent and not been as good as in design. The most important task at the company in this day is to improve and stabilize this performance with a target to obtain the copper concentrate of 23% Cu and recovery of over 91.5%. This report presents some research results to increase the recovery and quality of the copper concentrate at Ta Phoi beneficiation plant. As the results, some technological solutions have been proposed concerning the optimization of the reagent regime as well as of flotation flowsheet. Some of these solutions have been tested directly in the plant production line and have the perspective to apply.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 231--234
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ecological Risk Assessment for Occurrence of Toxic Elements in Various Land Use Types in Vietnamese Mekong Delta Province
    Autorzy:
    Nhien, Huynh Thi Hong
    Mi, Le Thi Diem
    Giao, Nguyen Thanh
    Powiązania:
    https://bibliotekanauki.pl/articles/2173267.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    An Giang
    ecological risk
    heavy metals
    land use type
    pollution index
    Opis:
    A total of 316 soil samples in the An Giang province were collected from the industrial zone (48 samples), mining (40 samples), farming (112 samples), landfills (88 samples) and cemeteries (28 a samples) to analyze toxic elements, including Cu, Zn, Pb, Cd and As. The geoaccumulation index (Igeo), pollutant load index (PLI) and potential ecological risk index (RI) were used to assess pollution levels and ecological risks. The results showed that the concentrations of heavy metals were almost still within the allowable limits of national standards. Cd was not detected. Heavy metals were detected in the soil in the following order: As < Pb < Cu < Zn, mining < industrial < landfill < cultivation < cemetery areas. The heavy metals contributing to soil environmental variability were similarly identified in the cemetery with industry and landfill with farming. The value of Igeo shows that As has a high potential to accumulate in soil in all land uses. The ranges of PLI values presented that the soil in industrial, farming, mining and landfills areas were classified moderate, while the cemetery areas has been rated at a high level. The RI values identified very high, high, and moderate ecological risks for cemetery, industrial and farming land and landfill, mining, respectively. The combination of PLI and RI indices showed that the cemetery areas were at the highest levels of pollution and risk. The results of this study provide scientific information on pollution level and ecological risks in various land use types supporting environmental zoning and managing strategies in the An Giang province.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 7; 121--130
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strategy in Dispatching Trucks and Shovels with Different Capacity to Increase the Operating Efficiency in Cao Son Surface Coal Mine, Vietnam
    Autorzy:
    Pham, Van Hoa
    Tran, Trung Chuyen
    Le, Hong Anh
    Le, Thi Thu Hoa
    Pham, Van Viet
    Nguyen, Anh Tuan
    Le, Thi Huong Giang
    Powiązania:
    https://bibliotekanauki.pl/articles/2020238.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    truck dispatching
    truck-shovel system
    dispatching strategy
    detailed match factor
    górnictwo odkrywkowe
    Wietnam
    strategia
    Opis:
    In surface mining operations, the operating costs of truck-shovel system constitutes 50-60% of the total. Only a little save in the operation costs in this system will bring large profit for the mines. Due to many investment periods, the capacity of both trucks and shovels in Cao Son surface coal mine is different. This leads to the low efficiency and the difficulty in dispatching strategy for the mine. This paper presents the current situation and selection of advanced dispatching strategy for increasing the efficiency trucks and shovels at this surface coal mine. The results show the detailed match factor reflects the state of each team of loader and trucks and should be use as the indicator for dispatching decision for the heterogeneous truck and shovel fleet at Cao Son surface coal mine.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 487--494
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of global economic policy uncertainty on bank stability
    Wpływ niepewności globalnej polityki gospodarczej na stabilność banków
    Autorzy:
    Chau, Nguyen Thi Minh
    Oanh, Dao Le Kieu
    Powiązania:
    https://bibliotekanauki.pl/articles/27315124.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    uncertainty
    economic policy
    banking system
    stability
    Asia
    niepewność
    polityka gospodarcza
    system bankowy
    stabilność
    Azja
    Opis:
    This paper aims to determine the effect of global economic policy uncertainty on the banking system's stability in Asian countries. The dependent variable in the study is measured through the bank's payment risk Zscore. The primary explanatory factor is global economic policy uncertainty, and other control variables include the banking system's characteristics and the national economic environment. Asian banking systems’ data are collected from World Bank between 2008 and 2020. Based on the System Generalized Method of Moments, the main results indicate that global economic policy uncertainty is seriously exacerbating the instability of the banking system of Asian countries. The study also shows that the ability to use mobilized capital and the degree of concentration of the system reduces the adverse impact of global economic policy uncertainty on the stability of the banking system in Asian countries.
    Celem niniejszego artykułu jest określenie wpływu niepewności globalnej polityki gospodarczej na stabilność systemu bankowego w krajach azjatyckich. Zmienna zależna w badaniu jest mierzona za pomocą wskaźnika Zscore ryzyka płatniczego banku. Głównym czynnikiem objaśniającym jest niepewność globalnej polityki gospodarczej, a inne zmienne kontrolne obejmują charakterystykę systemu bankowego i krajowe środowisko gospodarcze. Dane dotyczące azjatyckich systemów bankowych pochodzą z Banku Światowego w latach 2008-2020. W oparciu o system uogólnionej metody momentów, główne wyniki wskazują, że niepewność globalnej polityki gospodarczej poważnie pogarsza niestabilność systemu bankowego krajów azjatyckich. Badanie pokazuje również, że zdolność do wykorzystania zmobilizowanego kapitału i stopień koncentracji systemu zmniejsza niekorzystny wpływ niepewności globalnej polityki gospodarczej na stabilność systemu bankowego w krajach azjatyckich.
    Źródło:
    Polish Journal of Management Studies; 2023, 27, 1; 46--61
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effectiveness of a Mobile Application-Based Intervention to Improve Knowledge and Practice Regarding Silicosis Among High-Risk Workers of Dust Exposure in a Northern Province of Vietnam
    Autorzy:
    Nguyen, Thi Thu Huyen
    Ta, Thi Kim Nhung
    Pham, Thi Quan
    Nguyen, Thanh Thao
    Nguyen, Ngoc Anh
    Nguyen, Thi Lien Huong
    Le, Thi Huong
    Luong, Mai Anh
    Le, Thi Thanh Xuan
    Powiązania:
    https://bibliotekanauki.pl/articles/27323251.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    knowledge
    practice
    workers
    silicosis
    mobile application
    effectiveness
    praca
    aplikacja mobilna
    Wietnam
    Opis:
    Objectives: to analyze changes in knowledge and practices regarding silicosis in groups of workers at high risk of silicosis before - after an intervention. Methods: The study was conducted from 2018 to 2019 based on structured questions related to knowledge and practices of silicosis of workers directly exposed to silica dust in a Northern province of Vietnam. The mobile app-based intervention was applied to steel workers, then compared with ironworkers in improvements in silicosis knowledge and practices. Results: Significant changes in the intervention group related to workers' knowledge about the signs suggestive of silicosis, disease consequences, measures to reduce the risk of silicosis, and participation in annual occupational disease examinations were reported. Conclusion: Mobile applicationbased interventions could improve silicosis knowledge and practice among workers at high risk of exposure to silica dust.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 295--302
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupling Satellite Images and Unmanned Aerial Vehicle Data to Monitor the Exploitation of Open-Pit Mine
    Łączenie zdjęć satelitarnych i danych bezzałogowego statku powietrznego w celu monitorowania eksploatacji kopalni odkrywkowej
    Autorzy:
    Tong, Si Son
    Le, Quang Toan
    Vu, Phan Long
    Pham, Thi Lan
    Ha, Le Thi Thu
    Tong, Thi-Huyen-Ai
    Nguyen, Vu Giang
    Powiązania:
    https://bibliotekanauki.pl/articles/318465.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    land cover dynamic
    open-pit mine
    UAV
    stages of exploitation
    dynamika zmienna terenu
    kopalnia odkrywkowa
    bezzałogowy statek powietrzny
    etapy eksploatacji
    Opis:
    Discovering the variation of an open-pit mine in vertical, horizontal, and temporal dimensions as well to characterize the stages and the trends of the exploitation are indispensable tasks which provide information supporting decision making and planning for sustainable development of the mining industry. Remote sensing technique with the advantages of multi-spatial, multi-spectral, multi-temporal resolution is a promising solution to meet the information requirement. This study proposes an approach of coupling the high-resolution satellite images and Unmanned Aerial Vehicle (UAV) data to observe the variation of Tan An open rocky mine during its lifetime. Five satellite images with the resolution of 0.5 m acquired in 2006, 2012, 2014, 2016, 2018, and two ortho-images with 0.034 m resolution constructed from UAV photos captured in 2019, 2020 are used to make land cover maps. The analysis of land cover changes discovers 3 stages of open-pit mine exploitation consisting of unprompted exploitation, exploiting outbreak and stable exploitation corresponding to the changes in the mine. Besides, two Digital Surface Models (DSM) constructed by UAV photos are compared to calculate the elevation and volume changes. The assessment of the correlation between elevation change and land cover change indicates that the mineral exploitation is in the vertical range from 645 m to 660 m, and the exploitation trend is following the horizontal expansion rather than the deep excavation. Additionally, this experiment results in 79,422 m3 of mineral taken from the mine, and 34,022 m3 of soil used for the restoration within a year from June 2019 to June 2020.
    Monitorowanie zmienności kopalni odkrywkowej w wymiarze pionowym, poziomym i czasowym oraz scharakteryzowanie etapów i trendów eksploatacji są niezbędnymi zadaniami niezbędnymi do dostarczenia informacji wspomagających podejmowanie decyzji i planowanie zrównoważonego rozwoju górnictwa. Technika teledetekcji z zaletami wieloprzestrzennej, wielospektralnej, wieloczasowej rozdzielczości jest obiecującym rozwiązaniem spełniającym powyższe wymaganie. Niniejsze badanie proponuje podejście po-legające na połączeniu obrazów satelitarnych o wysokiej rozdzielczości i danych z bezzałogowego statku powietrznego (BSP) w celu obserwacji zmian w otwartej kopalni skalnej Tan An w czasie jej życia. Pięć zdjęć satelitarnych o rozdzielczości 0,5 m, pozyskanych w latach 2006, 2012, 2014, 2016, 2018 oraz dwa ortofotomapy o rozdzielczości 0,034 m wykonane ze zdjęć BST wykonanych w 2019, 2020 r. Są wykorzystywane do tworzenia map pokrycia terenu. Analiza zmian pokrycia terenu ujawnia 3 etapy eksploatacji kopalni odkrywkowej, na które składają się: eksploatacja niezamówiona, ognisko eksploatacyjne oraz etapy stabilnej eksploatacji odpowiadające zmianie pokrycia terenu w kopalni. Ponadto porównuje się dwa modele numeryczne powierzchni (MNP) zbudowane na podstawie zdjęć BSP, aby obliczyć wysokość i zmiany objętości kopalni. Ocena korelacji między zmianą wysokości a zmianą pokrycia terenu wskazuje, że eksploatacja kopaliny mieści się w przedziale od 645 m do 660 m npm, a trend eksploatacji raczej według ekspansji poziomej niż metodą wydobywczą. Dodatkowo, w wyniku tego doświadczenia uzyskano 79 422 m3 gruntów pobranego z kopalni oraz 34022 m3 gruntów użytej do rekultywacji w ciągu roku od czerwca 2019 do czerwca 2020.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 291-299
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antecedents of green purchase intention: a cross-cultural empirical evidence from Vietnam and Poland
    Autorzy:
    Cong Doanh, Duong
    Gadomska-Lila, Katarzyna
    Thi Loan, Le
    Powiązania:
    https://bibliotekanauki.pl/articles/19233725.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    green purchase intention
    green products purchase willingness
    collectivism
    long-term orientation
    perceived environmental knowledge
    Opis:
    Research background: Even though antecedents of green consumption have already been considered in numerous scientific articles, their findings still remain inconsistent. Furthermore, far less attention has been paid to understanding the underlying mechanism of cultural values, including collectivism and long-term orientation, and perceived environmental knowledge influencing intention to purchase environmentally friendly products, as well as the meditating role of green purchase willingness in the linkages between antecedents and green purchase intention. In addition, some previous studies suggested that it might be meaningful and significant to explore these linkages in the cross-cultural context with different levels of economic development. Purpose of the article: This study explored the effects of cultural dimension, perceived environmental and green purchase willingness with regard to intention to purchase environmentally friendly products of Vietnamese and Polish customers. Moreover, the mediating role of green purchase willingness was also investigated in this study. Methods: To achieve the objectives of this research, customer surveys were conducted in two developing countries ? Vietnam and Poland. Two convenience samples of 611 Vietnamese consumers and 301 Polish consumers have been recruited from 03 May to 03 October 2020. The structural equation modelling (SEM) was utilized to examine the conceptual framework and test the proposed hypotheses. Findings & value added: The research revealed that green purchase willingness became the most influential factor to predict green purchase intention in both cultures. Also, perceived environmental knowledge was found to have substantial effects on willingness and intention to purchase environmentally friendly products in both countries, even though the influential degree in Poland was much higher than that in Vietnam. Remarkably, cultural dimensions were found to significantly affect green consumption in the collectivist culture of Vietnam, while these relationships were not significant in Poland. This study was expected to significantly contribute to the existing literature by boosting our understanding of the importance of cultural values and perceived knowledge environment in promoting green consumption in the cross-cultural context.
    Źródło:
    Oeconomia Copernicana; 2021, 12, 4; 935-971
    2083-1277
    Pojawia się w:
    Oeconomia Copernicana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Managing the real estate market based on stock market development and macro factors
    Zarządzanie rynkiem nieruchomości w oparciu o rozwój rynku akcji i czynniki makro
    Autorzy:
    Quang, Luu Thu
    Han, Le Thi
    Nguyen, The Binh
    Powiązania:
    https://bibliotekanauki.pl/articles/27315171.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    real estate market
    Granger causality
    stock market development
    macro factors
    emerging market
    rynek nieruchomości
    rozwój giełdy
    przyczynowość Grangera
    czynniki makro
    rynek wschodzący
    Opis:
    By utilizing quarterly data in Vietnam, this study is the first paper to examine the causal relationship between stock market developments and real estate market developments. Three variables are used as a proxy of the stock market development: size, turnover ratio, and total value ratio. Total investment and expenditure on real estate are used as an indicator of real estate development. The highlight contribution is that the paper implements separate tests on the interrelationships between the variables through the results of variance decomposition and repulsion affecting these two markets. The multivariable vector autoregression model (VAR) and the Toda-Dolado methods are applied to fully consider the response of two variables. The results show a two-way causal relationship between the stock and the real estate market that diverges significantly from those of earlier research done in developed markets. The real estate market will experience a decline in the medium term when size and the total value ratio of the stock market decline. But in the long term, the stock market's size and total value ratio will gradually have less of an impact on the real estate market. In contrast, the trend of the impact of turnover ratio on the real estate market will gradually increase in the long term. This result offers empirical support for policymakers who manage the development of the real estate market based on macro factors and the stock market.
    Wykorzystując dane kwartalne w Wietnamie, niniejsze badanie jest pierwszym dokumentem badającym związek przyczynowy między rozwojem rynku akcji a rozwojem rynku nieruchomości. Jako wskaźnik rozwoju rynku akcji wykorzystano trzy zmienne: wielkość, wskaźnik obrotu i wskaźnik wartości całkowitej. Całkowite inwestycje i wydatki na nieruchomości są wykorzystywane jako wskaźnik rozwoju rynku nieruchomości. Najważniejszym wkładem jest to, że w artykule wdrożono oddzielne testy dotyczące wzajemnych powiązań między zmiennymi poprzez wyniki dekompozycji wariancji i odpychania wpływające na te dwa rynki. Wielozmienny model autoregresji wektorowej (VAR) i metody Toda-Dolado są stosowane w celu pełnego uwzględnienia odpowiedzi dwóch zmiennych. Wyniki wskazują na dwukierunkowy związek przyczynowy między rynkiem akcji a rynkiem nieruchomości, który znacznie odbiega od wyników wcześniejszych badań przeprowadzonych na rynkach rozwiniętych. Rynek nieruchomości doświadczy spadku w średnim okresie, gdy wielkość i całkowity wskaźnik wartości rynku akcji spadną. Jednak w dłuższej perspektywie wielkość rynku akcji i całkowity wskaźnik wartości będą stopniowo wywierać mniejszy wpływ na rynek nieruchomości. W przeciwieństwie do tego, trend wpływu wskaźnika obrotu na rynek nieruchomości będzie stopniowo wzrastał w długim okresie. Wynik ten stanowi empiryczne wsparcie dla decydentów, którzy zarządzają rozwojem rynku nieruchomości w oparciu o czynniki makro i rynek akcji.
    Źródło:
    Polish Journal of Management Studies; 2023, 27, 2; 294-310
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    How empathy and social entrepreneurial self-efficacy interact to affect social entrepreneurial intention: A polynomial regression with response surface analysis
    Autorzy:
    Le, Thi Loan
    Pham, Huong Thao
    Nguyen, Ngoc Duong
    Powiązania:
    https://bibliotekanauki.pl/articles/39829996.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    social social entrepreneurial intention
    empathy
    social entrepreneurial self-efficacy
    polynomial regression
    response surface analysis
    Opis:
    Research background: Previous studies have argued that empathy (EMP) is an important factor that enhances individuals’ intention to engage in social business. However, the effect of this factor on social entrepreneurial intention (SEI) is unclear (Ukil et al., 2023). Also, although numerous studies have explored the individual impacts of EMP and social entrepreneurial self-efficacy (SES) on SEI, there is a notable scarcity of research that delves into the combined influence of these two predictor variables on the intention to engage in social business. Purpose of the article: This study proposes that EMP does not only individually affect, but also interacts with other factors to influence the intention to start a social business. Therefore, this study aims to investigate how EMP and SES interact to promote SEI. Methods: Based on a survey dataset of 409 respondents in Vietnam, this study employed polynomial regression with response surface analysis to examine the complementary, balance, and imbalance effects of EMP and SES on SEI. Findings & value added: This study's results suggest complementary effects between EMP and SES on SEI. Specifically, this study finds that when EMP and SES are balanced at higher levels, SEI is higher, and when their imbalance increases in either direction, SEI is lower. In addition, this study finds that the degree of SEI is higher when individuals have high SES with low EMP compared to the other way round. The findings of this study enhance our understanding of the complexity of motivation and how it affects SEIs, revealing the complex interaction between EMP and SES in shaping these intentions within a multidimensional motivational framework.
    Źródło:
    Oeconomia Copernicana; 2023, 14, 4; 1341-1366
    2083-1277
    Pojawia się w:
    Oeconomia Copernicana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genotype TNF-α(-308) and Silicosis on Factory Workers in Vietnam in 2020
    Autorzy:
    Nguyen, Viet
    Nguyen, Thi Thu Huyen
    Dao, Xuan Dat
    Vu, Xuan Quy
    Pham, Thi Quan
    Le, Thi Kim Chung
    Tran, Huy Thinh
    Le, Thi Huong
    Nguyen, Ngoc Anh
    Nguyen, Viet Nhung
    Nguyen, Ngoc Hong
    Luong, Mai Anh
    Le, Thi Thanh Xuan
    Powiązania:
    https://bibliotekanauki.pl/articles/2020235.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    silicosis
    genotype
    TNF-α
    Vietnam
    Wietnam
    genotyp
    Opis:
    The studFigy aims to determine the TNF-α single-nucleotide polymorphism TNF-α (-308) and assess the association of TNF-a(-308) SNP with the risk of silicosis among workers directly exposed to silica dust in Vietnam. A study was undertaken among 78 cases with silicosis and 103 controls without silicosis in Vietnam. Blood samples were collected for genomic DNA extraction from each subject. The phenotyping of TNF-α(-308) was performed using polymerase chain reaction‐based restriction fragment length polymorphism (PCR‐RFLP) and dye termination sequencing. Results: The average exposure time of the case group was slightly higher than that of the control group (12.46 ± 6.732 years vs. 12.09 ± 7.854 years). The majority of genotypes in both silicosis and non-silicosis was GG. When analyzing the concentration of TNF-α in the study participants' blood, it is shown that the average concentration of TNFα in the case group was higher than that in the control group. The genotype AG in the case group was 1.368 times higher than that in the control group. The percentage of all A alleles in the case group with silicosis was 1.342 times higher than the control group without the disease, similar to previous studies. Conclusion: The majority of genotypes in both groups was GG. The average concentration of TNF-α in blood, genotype AG, and the percentage of all A alleles in the case group was higher than that in the control group.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 459--466
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on Suitable Mining Technology for Placer Titanium Mines in Vietnam
    Dobór odpowiedniej technologii eksploatacji okruchowego tytanu w Wietnamie
    Autorzy:
    Le, Qui Thao
    Nguyen, Hoang
    Nguyen, Nga
    Vu, Dinh Hieu
    Le, Hoa Thu-Thi
    Nguyen, Anh Thuc-Thi
    Bui, Xuan‑Nam
    Powiązania:
    https://bibliotekanauki.pl/articles/318901.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    mining technology
    placer titanium
    sustainable development
    Vietnam
    technologia górnicza
    złoże okruchowego tytanu
    zrównoważony rozwój
    Wietnam
    Opis:
    Vietnam has a potential reserve of placer titanium of around 650 Mt. The reserve lays in sandy beaches of the country from Thanh Hoa to Binh Thuan province. Placer titanium mines in Vietnam are different in geological condition, the scale of production, mining method, and environmental protection solutions, etc. Some of them are operating with inappropriate mining technology; therefore, have caused environmental issues and ineffective operation. Consequently, it is essential to have criteria for selecting appropriate mining technology to approach the sustainable development for the mines. Based on categories of geology, the scale of production, mining characteristics, requirements of safety, land reclamation and environmental protection, and mining effect, authors defined the criteria and method for selecting adequate mining technology for the placer titanium mines in Vietnam which aim for better safe, effective and sustainable. The categories to select the appropriate technology for coastal titanium placers in Vietnam including 1- feasible mining scheme, 2- mining procedure, 3- requirement volume of water, 4- slope stability, 5- environmental rehabilitation and reclamation, and 6- economic effect. The result of the application for Nam Suoi Nhum placer titanium mine in Bình Thuan province shows that the most appropriate scheme of this mine is the mining technology of using hydraulic jets, pumping and hauling by pumping mud, processing by spiral screws, and discharging by mud pumping.
    Wietnam ma potencjalne rezerwy okruchowego tytanu w wysokości około 650 Mt. Rezerwat leży na piaszczystych plażach kraju od Thanh Hoa do prowincji Binh Thuan. Kopalnie okruchowego tytanu w Wietnamie różnią się stanem geologicznym, skalą produkcji, sposobem wydobycia, rozwiązaniami w zakresie ochrony środowiska itp. Niektóre z nich działają na niewłaściwej technologii wydobywczej, w związku z czym spowodowały problemy środowiskowe i nieefektywną eksploatację. W związku z tym niezbędne jest posiadanie kryteriów doboru odpowiedniej technologii wydobywczej do podejścia do zrównoważonego rozwoju. W oparciu o kategorie geologiczne, skalę produkcji, charakterystykę górniczą, wymagania bezpieczeństwa, rekultywacji gruntów i ochrony środowiska oraz efektu górniczego, autorzy określili kryteria i sposób doboru odpowiedniej technologii wydobycia dla stacjonujących kopalni tytanu w Wietnamie, które mają na celu zwiększenie bezpieczeństwa , efektywne i trwałe. Te kategorie obejmują 1- wykonalny schemat wydobycia, 2- procedurę wydobycia, 3- wymaganą ilość wody, 4- stateczność zboczy, 5-rekultywację środowiska oraz 6-efekt ekonomiczny. Wynik zastosowania dla kopalni okruchowego tytanu Nam Suoi Nhum w prowincji Bình Thuan pokazuje, że najbardziej odpowiednim schematem tej kopalni jest technologia wydobywcza wykorzystująca strumienie hydrauliczne, pompowanie i ciągnięcie przez pompowanie szlamu, przetwarzanie za pomocą śrub spiralnych i odprowadzanie przez pompowanie błota.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 75-86
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of truck-shovel dispatching in Cao Son Open-Pit coal mine and the ability in applying information technology for increasing its efficiency
    Oszacowanie wywozu ładowarkami w kopalni odkrywkowej Cao Son i możliwości zastosowania technologii informatycznych w celu zwiększenia wydajności
    Autorzy:
    Pham, Van Hoa
    Bui, Xuan‑Nam
    Le, Van Quyen
    Le, Thi Thu Hoa
    Pham, Van Viet
    Powiązania:
    https://bibliotekanauki.pl/articles/317977.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    kopalnie odkrywkowe
    wywóz
    Wietnam
    efektywność
    open pit mines
    dispatching
    Vietnam
    efficiency
    Opis:
    With many types of trucks and shovels for hauling large volume of waste rocks to the dump sites and coal to the storages, the truck – shovel dispatching in Cao Son open pit coal mine is the operation which needs to be improved. At present, the combination between trucks and shovel is usually assigned at the beginning of shift and adjusted during the operation at the mine. The GPS tracking system are integrated into each truck to monitor the position in real time, but applying this information to find the best destination to send the truck to satisfy the production requirements and to minimize truck operating costs is still not used. This paper presents the estimation of the information system, data, the remaining problems of truck – shovel dispatching system, from that proposes the application of available information technology for increasing the efficiency of this activities at the mine.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 2/2; 21-27
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    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:
    The influence of spontaneously generated coherence and phase of laser fields on optical bistability in a three-level atomic medium: an analytical approach
    Autorzy:
    Van, Doai Le
    Minh, Phuong Le Thi
    Tien, Dung Nguyen
    Xuan, Khoa Dinh
    Huy, Bang Nguyen
    Powiązania:
    https://bibliotekanauki.pl/articles/174730.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    optical bistability
    electromagnetically induced transparency
    spontaneously generated coherence
    Opis:
    The influence of spontaneously generated coherence and relative phase of laser fields on optical bistability in a three-level atomic medium under electromagnetically induced transparency was studied by using a density matrix theory. An input-output intensity relation of a probe laser field is derived as an analytical function of parameters of a controlling light field, the relative phase, and the spontaneously generated coherence. This function can be fitted with experimental values to be a semi-empirical model which is helpful for finding related applications. It is shown that thresholds and width of the optical bistability hysteresis loop can be manipulated with the controllable parameters. On the other hand, the influence of population relaxation between two ground hyperfine levels on the optical bistability behavior is significant for small coupling field intensity.
    Źródło:
    Optica Applicata; 2019, 49, 3; 509-522
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study on loan repayment options for power plant construction: a case study of the Son La hydropower plant, Vietnam
    Badanie możliwości spłaty kredytu na budowę elektrowni: studium przypadku elektrowni wodnej Son La w Wietnamie
    Autorzy:
    Tu, Le Tat
    Phap, Vu Minh
    Huong, Nguyen Thi Thu
    Powiązania:
    https://bibliotekanauki.pl/articles/27312536.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
    Tematy:
    economic effects
    electric power system
    hydropower plant
    investment
    NPV
    IRR
    efekt ekonomiczny
    system elektroenergetyczny
    elektrownia wodna
    inwestycja
    Opis:
    Using loans is an effective solution for the investment and construction of energy works in general and power plants in particular, especially for developing countries. In economic and financial studies of the project investment preparation stage, the options of using capital and paying interest will be taken into account to minimize risks and increase the project’s ability to pay due debts. However, it is difficult to know which loan repayment option is the most beneficial for the project and when the risk is for the project in the context of debt repayment. The current economic and financial analysis of the project mainly focuses on determining the feasibility of the project through basic parameters, such as net present value (NPV), benefit – cost – ratio (B/C), internal rate of return (IRR), profitability index (PI) and payback period (PP). These parameters do not indicate the most difficult time to pay off the project’s loans. This paper analyzes two options for repayment of long-term loans in Vietnam using the case study of Son La hydropower plant to clarify the above difficult times and recommend a suitable repayment plan for the power project. The analytical method is used to actualize the cash flow of capital and interest during the construction and operation of the works. In Option 1, the debt is paid annually for interest and capital with a constant amount of money during the repayment period. In Option 2, the original dept without interest is paid with a constant amount of money during the repayment period, the interest (due to the remaining original capital) must be paid in the year when the interest is incurred. The study results show that the amount of the annual payment in option 1 is smaller than in Option 2 in the first four years (of ten years of debt repayment). Thus, capital and interest payment in Option 2 may be more detrimental than Option 1 in the first three years of debt repayment, and the amount of money from debt repayment is greater than the profit obtained from power generation. Thus, depending on the profit in the first years when the power plant comes into operation, the investor needs to decide on a reasonable way to repay the loan so that the project can self-finance.
    Korzystanie z kredytów jest skutecznym rozwiązaniem dla inwestycji i budowy zakładów energetycznych w ogóle, a w szczególności elektrowni, zwłaszcza w krajach rozwijających się. W analizach ekonomiczno-finansowych etapu przygotowania inwestycji projektu uwzględnione zostaną możliwości wykorzystania kapitału i spłaty odsetek w celu zminimalizowania ryzyka i zwiększenia zdolności projektu do spłaty wymaganych długów. Trudno jednak stwierdzić, która opcja spłaty kredytu jest najkorzystniejsza dla projektu i kiedy występuje ryzyko dla projektu w kontekście spłaty zadłużenia. Bieżąca analiza ekonomiczno-finansowa projektu koncentruje się głównie na określeniu wykonalności projektu poprzez podstawowe parametry, takie jak wartość bieżąca netto (NPV), stosunek korzyści do kosztów (B/C), wewnętrzna stopa zwrotu (IRR), wskaźnik rentowności (PI) i okres zwrotu (PP). Parametry te nie wskazują na najtrudniejszy czas na spłatę kredytów projektu. W niniejszym artykule przeanalizowano dwie opcje spłaty kredytów długoterminowych w Wietnamie na przykładzie elektrowni wodnej Son La, uwzględniając obecne trudne warunki i zalecając odpowiedni plan spłaty dla projektu energetycznego. Metoda analityczna służy do aktualizacji przepływów pieniężnych kapitału i odsetek w trakcie budowy i eksploatacji obiektu. W Wariancie 1 dług jest spłacany corocznie na odsetki i kapitał stałą kwotą w okresie spłaty. W Wariancie 2 pierwotny dług bez odsetek spłacany jest stałą kwotą w okresie spłaty, odsetki (należne od pozostałego kapitału pierwotnego) muszą być zapłacone w roku, w którym naliczone zostały odsetki. Wyniki badań wskazują, że wysokość rocznej spłaty w Wariancie 1 jest mniejsza niż w Wariancie 2 w pierwszych czterech latach (z dziesięciu lat spłaty zadłużenia). Zatem spłata kapitału i odsetek w Wariancie 2 może być bardziej szkodliwa niż w Wariancie 1 w pierwszych trzech latach spłaty zadłużenia, a kwota pieniędzy ze spłaty zadłużenia jest większa niż zysk uzyskany z produkcji energii. Zatem w zależności od zysku w pierwszych latach od uruchomienia elektrowni, inwestor musi zdecydować, jak rozsądnie spłacić kredyt, aby projekt mógł się sam sfinansować.
    Źródło:
    Polityka Energetyczna; 2023, 26, 2; 121--140
    1429-6675
    Pojawia się w:
    Polityka Energetyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Spatial-Temporal Variations of Surface Water Quality in the Southern Province of Vietnamese Mekong Delta Using Multivariate Statistical Analysis
    Autorzy:
    Hong, Tran Thi Kim
    Viet, Le Hoang
    Giao, Nguyen Thanh
    Powiązania:
    https://bibliotekanauki.pl/articles/2173256.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    surface water
    organic pollution
    multivariate statistical analysis
    Tien Giang province
    Opis:
    The study aimed to assess the variation in surface water quality in the Tien Giang province, Vietnam, and at the same time identify the main sources of water pollution. The surface water quality samples were collected at 34 locations (NM01-NM34) with 17 surface water quality indicators in March, June, September and November in canals and rivers in the Tien Giang province. Multivariate statistical analysis methods, including principal component analysis (PCA), cluster analysis (CA) and numerical discriminant analysis (DA), were used to analyze the variability and key indicators affecting the effect of multivariate statistical analysis. The analysis results show that the surface water quality in the study area is contaminated with organic (low DO, high BOD and COD) and nutrients (NH4+-N, NO2--N, PO43--P and TP), salinity (high Cl-). The PCA results showed that 14/17 surface water environmental parameters to be monitored are pH, temperature, TSS, BOD, COD, NH4+-N, NO2--N, PO43--P, TP, SO42-, Cl-, coliform and Fe. The PCA analysis showed that PC1-PC4 accounted for 79.70% of the variation in surface water quality in the study area. Potential surface water polluting sources include hydrological regime, domestic waste, agricultural production, industrial production activities. The CA results showed that 34 monitoring locations can be reduced to 27 locations, with a frequency of 4 times/year to ensure surface water quality representativeness. The DA indicated that the indicators of EC, SO42- and Cl- made the difference of the surface water quality between the wet and dry seasons. The current results provide important information on the current state of water quality for different uses and contribute to the improvement of the surface water quality monitoring system in the Tien Giang province.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 7; 1--9
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reforming specialized inspection procedures to improve business environment in Vietnam for trade facilitation implementation
    Autorzy:
    Nga, Le Thi Viet
    Huy, Dinh Tran Ngoc
    Hang, Nga Nguyen Thi
    Lan, Leng Thi
    Thach, Nguyen Ngoc
    Powiązania:
    https://bibliotekanauki.pl/articles/2064451.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    Vietnam
    trade facilitation
    inspection procedures
    competitiveness
    business environment
    Wietnam
    ułatwienia w handlu
    handel
    procedury kontrolne
    konkurencja
    środowisko biznesowe
    Opis:
    Our study aims to analyze and assess the process of reforming the specialized inspection procedures in Vietnam which is included in Vietnam’s trade facilitation implementation program, and suggesting some recommendations for Vietnam to do the reform to improve business environment and enhance Vietnam’s national competitiveness. By synthesizing and analyzing secondary data from creditable sources such as World Bank, UNESCAPE, UNCTAD, WTO, VCCI, General Department of Vietnam Customs, as well as interviewing officials from Ministry of Industry and Trade of Socialist Republic of Vietnam, etc. Ha and Lan (2021) stated Economic regulatory reform in Vietnam started in the early 1990s and accelerated when the country shifted its focus to economic integration policy by acceding to the World Trade Organization (WTO) in 1995 and engaging in regional free trade agreements in the Association of Southeast Asian Nations (ASEAN). After analyzing and assessing the real situation of Vietnam’s trade facilitation and specialized inspection reforms, this paper would like to suggest some recommendations to continuously implement specialized inspection reforms, implement trade facilitation, improve Vietnam’s business environment and enhance Vietnam’s national competitiveness.
    Źródło:
    Management; 2021, 25, 1; 234--258
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    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:
    Vietnam’s meat import market under Impacts of the European -Vietnam Free Trade Agreement and quality management demand
    Autorzy:
    Minh, Nguyen Doan
    Viet, Nga Le Thi
    Huy, Dinh Tran Ngoc
    Powiązania:
    https://bibliotekanauki.pl/articles/1818278.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    EVFTA
    Vietnam
    EU
    meat import
    SMART
    FTA
    quality management
    Wietnam
    UE
    import mięsa
    zarządzanie jakością
    Opis:
    The impact of Free Trade Agreement (FTA) on commercial business of the member could be assessed by the potential and tangible effects. This paper is adopted by Partial equilibrium theory and SMART tool to measure the impact of EVFTA on the Vietnamese meat import (HS code 02). The result of this model is claimed that EVFTA has a huge impact on boosting the meat import from EU to Vietnam. However, the value of import in this category from European nations in each country and good fluctuated significantly. This study also proposes some measures for domestic businesses and the government to ensure the benefits on Vietnam’s livestock industry. Last but not least, meat quality management is one of vital issues under EFVTA and global competitiveness to meet higher expectation of consumers. Good food (meat) manufacturing practices need to be applied. That is the social contribution value of this paper.
    Źródło:
    Management; 2021, 25, 1; 99-117
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining for an output capacity of dimension stone exploitation from the computer simulations to generate the fracture network in 3D: case study in some dimensional stone quarries in Vietnam
    Określenie wydajności wykorzystania kamienia blocznego z symulacji komputerowych w celu wygenerowania sieci pęknięć w 3D: studium przypadku w kamieniołomach kamieni blocznych w Wietnamie
    Autorzy:
    Nguyen, Anh Tuan
    Pham, Van Hoa
    Pham, Van Viet
    Le, Van Quyen
    Le, Thi Hai
    Nguyen, Tuan Anh
    Powiązania:
    https://bibliotekanauki.pl/articles/318207.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    kamieniołomy
    Wietnam
    symulacja komputerowa
    quarries
    Vietnam
    computer simulation
    Opis:
    In dimension stone quarry exploitations such as the marble quarry, a literature review of the existing numerical modelling techniques has been carried out. According to Distinct Element Method, discontinuities have been treated as boundary conditions between blocks and, consequently, an accurate knowledge of joint distribution and orientation was required. The result of analyzing data and simulating in the fracture rock environment, which is applied to a mining condition of the dimensional stone quarries. The research we introduce in the output capacity of the dimension stone quarry from the computer simulations to generate the fracture network in 3D with an aim of evaluating the size of the blocks. The results of numerical models have been used to optimize some of the technical parameters for dimensional stone extraction and ensuring stable bench in the mining operation.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 2/2; 135-146
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emission Reduction in Oil & Gas Subsurface Characterization Workflow with AI/ML Enabler
    Autorzy:
    Thanh, Thuy Nguyen Thi
    Lee, Samie
    Nguyen, The
    Duyen, Le Quang
    Powiązania:
    https://bibliotekanauki.pl/articles/27323253.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    CO2 emission
    net zero carbon
    machine learning
    CCUS
    digital transformation
    emission reduction
    digital subsurface workflow
    emisja CO2
    transformacja cyfrowa
    redukcja
    Opis:
    According to (McKinsey & Company, 2020), drilling and extraction operations are responsible for 10% of approximately 4 billion tons of CO2 emitted yearly by Oil and Gas sector. To lower carbon emissions, companies used different strategies including electrifying equipment, changing power sources, rebalancing portfolios, and expanding carbon-capture-utilization-storage (CCUS). Technology evolution with digital transformation strategy is essential for reinventing and optimizing existing workflow, reducing lengthy processes and driving efficiency for sustainable operations. Details subsurface studies take up-to 6–12 months, including seismic & static analysis, reserve estimation and simulation to support drilling and extraction operations. Manual and repetitive processes, aging infrastructure with limited computing-engine are factors for long computation hours. To address subsurface complexity, hundred-thousand scenarios are simulated that lead to tremendous power consumption. Excluding additional simulation hours, each workstation uses 24k kWh/month for regular 40 hours/month and produces 6.1kg CO2. Machine Learning (ML) become crucial in digital transformation, not only saving time but supporting wiser decision-making. An 80%-time-reduction with ML Seismic and Static modeling deployed in a reservoir study. Significant time reduction from days-tohours-to-minutes with cloud-computing deployed to simulate hundreds-thousands of scenarios. These time savings help to reduce CO2-emissions resulting in a more sustainable subsurface workflow to support the 2050 goal.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 289--294
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of Cashew Apple Pomace Powder in Pasta Making: Effects of Powder Ratio on the Product Quality
    Autorzy:
    Nguyen, Thi Phuong Trang
    Tran, Thi Thu Tra
    Ton, Nu Minh Nguyet
    Le, Van Viet Man
    Powiązania:
    https://bibliotekanauki.pl/articles/16538534.pdf
    Data publikacji:
    2023-02-21
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    antioxidant capacity
    by-product
    dietary fiber
    pasta
    Opis:
    The production of cashew apple juice generates fruit pomace which is rich in dietary fiber and phenolic compounds and shows high antioxidant capacity. In this research, the effects of different ratios of cashew apple pomace powder (CAPP) in the pasta formulation on the product quality were investigated. Increase in CAPP level in the pasta recipe from 0 to 20% enhanced the total dietary fiber and total phenolic content of the product by 4.1 times and 11.8 times, respectively, as well as improved the 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity and ferric reducing antioxidant power by 18.2 times and 28.6 times, respectively. Nevertheless, the increased level of CAPP in the pasta recipe resulted in decreased cooking quality, textural properties and overall acceptability of the pasta. Pasta sample with 10% CAPP level in the recipe was considered high-fiber food with acceptable sensory quality. Therefore, CAPP may be considered a promising source of dietary fiber and antioxidants for the development of healthy food products.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2023, 73, 1; 50-58
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variation in Growth and Yield of Sacha Inchi (Plukenetia Volubilis L.) under Different Ecological Regions in Vietnam
    Autorzy:
    Van, Quang Vu
    Thi, Ngoc Yen Pham
    Thi, Tram Nguyen
    Van, Muoi Nguyen
    Van, Thanh Le
    Thi, Bich Ngoc Vu
    Thi, Bich Hong Nguyen
    Powiązania:
    https://bibliotekanauki.pl/articles/2173335.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    ecological region
    growth
    sacha inchi
    selection
    yield
    Opis:
    The sacha inchi seeds (Plukenetia Volubilis L.), collected from different ecological regions of Vietnam (the Northern Mountainous region, the North Central region, and Central Highlands Area), were sown in the spring crop (March 2020) in Gia Lam district, Hanoi city, Vietnam. The variety S18 was copyrighted by Ministry of Agriculture and Rural Developmentof Vietnam in 2019 as a special medicinal plant variety. During the period of 26 months after planting, the agronomical parameters, growth and development characteristics (leaf form, number of inflorescences per branches, number of female flowers per inflorescences, etc.), pests and diseases, yields and yield components (number of seeds per fruit, seed weight, seed grain, etc.), ratio of kernel per seed and ratio of oil per seed were evaluated. The evaluation results show that the collected sacha inchi lines have a time from sowing to flowering and fruiting of 108–125 days, a fruiting to ripening of 123–125 days, and a time from sowing to harvesting the first batch of 244–250 days. The annual harvest is carried out at two main times: May–June and November–January. The actual yield of the first two periods is high (2.66–3.07 tons per hectare), and the highest yield is collected in the Northern Mountainous area is 3.07 tons per hectare (in Tuyen Quang province), while and 3.01 tons per hectare are collected in the North Central region (in Thanh Hoa province). In the nursery, root rot caused 2.1–5.3% deaths and green wilt caused 3.1–4.8% deaths of seedlings. In the planting garden, fruit borers, stem borers, cavity worms and red spiders were discovered, causing more serious damage than other types (from 5 to over 50%). The results of evaluation of growth, development, yield components and yield showed that the sacha inchi lines collected in the North Central region (in Thanh Hoa province) and the Northern Mountainous region (in Tuyen Quang province) is the best.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 8; 162--169
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of mycelial growth and cultivation of wild Ganoderma sinense
    Autorzy:
    Nguyen, Luyen Thi
    Le, Ve Van
    Nguyen, Bich Thuy Thi
    Nguyen, Huyen Trang Thi
    Tran, Anh Dong
    Ngo, Nghien Xuan
    Powiązania:
    https://bibliotekanauki.pl/articles/16668411.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Ganoderma sinense
    mycelial growth
    spawn
    lingzhi mushroom
    Opis:
    Ganoderma sinense, a well-known medicinal macrofungus of Basidiomycetes, is widely used in traditional medicine for promoting health and longevity in East Asia. The fruiting bodies of G. sinense contain polysaccharides, ergosterol, and coumarin, which have antitumor, antioxidant, and anticytopenia activities. Mushroom cultivation requires suitable conditions for the formation of fruiting bodies and yield. However, little is known about the optimal culture conditions for mycelial growth and cultivation of G. sinense. In this study, the successful cultivation of a G. sinense strain collected from the wild was reported. The optimal culture conditions were identified by examining one factor at a time. The results of this study revealed that the nutritional requirements for the optimal mycelial growth of G. sinense were fructose (15 g/l) as the carbon source and yeast extract (1 g/l) as the nitrogen source. The optimal pH and temperature for G. sinense were 7 and 25–30EC, respectively. The mycelia grew fastest in treatment II (69% rice grains + 30% sawdust + 1% calcium carbonate). G. sinense produced fruiting bodies under all tested conditions and showed the highest biological efficiency (2.95%) in treatment B (96% sawdust, 1% wheat bran, 1% lime). In summary, under optimal culture conditions, G. sinense strain GA21 showed satisfactory yield and a high potential for commercial cultivation.
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2023, 104, 1; 65-74
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigation on the Performance of DJI Phantom 4 RTK in the PPK Mode for 3D Mapping Open-Pit Mines
    Eksperymentalne badanie możliwości zastosowania UAV typu DJI Phantom 4 RTK w trybie PPK do tworzenia 3D modeli w kopalniach odkrywkowych
    Autorzy:
    Le, Van Canh
    Cao, Xuan Cuong
    Nguyen, Quoc Long
    Le, Thi Thu Ha
    Tran, Tuan-Anh
    Bui, Xuan‑Nam
    Powiązania:
    https://bibliotekanauki.pl/articles/318999.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    unmanned aerial vehicle
    post processing kinematic
    digital surface model
    open-pit mines
    bezzałogowe statki powietrzne
    PPK
    DSM
    GCP
    kopalnie odkrywkowe
    Opis:
    Open-pit coal mines’ terrain is often complex and quickly and frequently changes. Therefore, topographic surveys of open-pit mines are undertaken on a daily basis. While these tasks are very time-consuming and costly with traditional methods such as total station and GNSS, the unmanned aerial vehicle (UAV) based method can be more efficient. This method is a combination of the “Structure from motion” (SfM) photogrammetry technique and UAV photogrammetry which has been widely used in topographic surveying. With an increasing popularity of RTK-enabled drones, it is becoming even more powerful method. While the important role of ground control points (GCP) in the accuracy of digital surface model (DSM) generated from images acquired by “traditional” UAVs (not RTK-enabled drones) has been proved in many previous studies, it is not clear in the case of RTK-enabled drones, especially for complex terrain in open-pit coal mines. In this study, we experimentally investigated the influence of GCP regarding its numbers and distribution on the accuracy of DSM generation from images acquired by RTK-enabled drones in open-pit coal mines. In addition, the Post Processing Kinematic (PPK) mode was executed over a test field with the same flight altitude. DSM generation was performed with several block control configurations: PPK only, PPK with one GCP, and PPK with two GCPs. Several positions of GCPs were also examined to test the optimal locations for placing GCPs to achieve accurate DSMs. The results show that the horizontal and vertical accuracy given by PPK only were 9.3 and 84.4 cm, respectively. However, when adding at least one GCP, the accuracy was significantly improved in both horizontal and vertical components, with RMSE for XY and Z ranging between 3.8 and 9.8 cm (with one GCP) and between 3.0 and 5.7 cm (with two GCPs), respectively. Also, the GCPs placed in the deep areas of the open-pit mine could ensure the cm-level accuracy.
    Tereny kopalni odkrywkowych w Wietnamie są często pozbawione roślinności o silnie zróżnicowanej morfologii utworzone w wyniku eksploatacji górniczej. Tradycyjne prace geodezyjne w kopalniach odkrywkowych są czasochłonne. W artykule, przedstawiono wyniki badania dotyczącego procesu technologicznego generowania 3D modeli i ortofotomapy na podstawie danych pozyskanych z pokładu bezzałogowej platformy UAV typu DJI Phantom 4RTK. Współcześnie bezzałogowe statki powierzchne (BSP) stanowią̨ dobrze rozwiniętą gałąź́ lotnictwa, która umożliwia pozyskiwanie danych z pułapu od kilku do kilkuset metrów. Własność́ ta stwarza nowe możliwości zastosowanie UAV w w kopalniach odkrywkowych. Omawiano metodę połączenia techniki fotogrametrii „Struktury z ruchu” (SfM) i fotogrametrii UAV, która jest szeroko stosowana w pomiarach topograficznych. Podczas gdy ważna rola naziemnych punktów kontrolnych (GCP) w dokładności cyfrowego modelu powierzchni (DSM) generowanego na podstawie obrazów uzyskanych przez „tradycyjne” UAV (a nie drony z obsługą RTK) została udowodniona w wielu poprzednich badaniach, nie jest to jasne w przypadek dronów obsługujących RTK, zwłaszcza na skomplikowanym terenie w odkrywkowych kopalniach węgla. W tym badaniu eksperymentalnie zbadano wpływ GCP pod względem jego liczby i rozmieszczenia na dokładność generowania DSM na podstawie obrazów uzyskanych przez drony z obsługą RTK w odkrywkowych kopalniach węgla. Dodatkowo, tryb Post Processing Kinematic (PPK) został uruchomiony na polu testowym na tej samej wysokości lotu. Generowanie DSM przeprowadzono z kilkoma konfiguracjami sterowania blokami: tylko PPK, PPK z jednym GCP i PPK z dwoma GCP. Zbadano również kilka pozycji GCP, aby przetestować optymalne lokalizacje do umieszczania GCP w celu uzyskania dokładnych DSM. Wyniki pokazują, że podana przez PPK dokładność pozioma i pionowa wyniosła odpowiednio 9,3 i 84,4 cm. Jednak po dodaniu co najmniej jednego GCP dokładność została znacznie poprawiona zarówno w komponentach poziomych, jak i pionowych, przy RMSE dla XY i Z w zakresie od 3,8 do 9,8 cm (z jednym GCP) i od 3,0 do 5,7 cm (z dwoma GCP), odpowiednio. Ponadto GCP umieszczone w głębokich obszarach kopalni odkrywkowej mogą zapewnić dokładność w granicach centymetrowych (cm).
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 65-74
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Facies Analysis and Depositional Environmental Interpretation of The Upper Oligocene, Block 09- 2/10, Cuu Long Basin
    Autorzy:
    Nguyen, Muoi Duy
    Le, Anh Ngoc
    Nguyen, Hoa Minh
    Bui, Ngan Thi
    Powiązania:
    https://bibliotekanauki.pl/articles/27323232.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    Cuu Long basin
    upper oligocene
    depositional environment
    seismic facies
    block 09-2/10
    Oligocen
    Wietnam
    sejsmika
    środowisko
    Opis:
    The article presents the facies and environment of the Upper Oligocene sediments in the area of block 09-2/10 based on the analysis of seismic facies and well data of the neighboring areas. The results of the interpretation of seismic data indicate that the upper Oligocene sediments are limited by the top C, top D seismic reflectors. The environment is formed from lagoons, lakes to deep lakes. Seismological facies analysis identified 03 facies including seismic facies with medium to poor reflection amplitude, medium continuous, low frequency reflecting the lacustrine sediments (80%) in most of the lake center. Strong reflective seismic facies, sigmoidal clinoforms reflect the lakeside sediments (15%) distributed in the lakeside shelf. The seismic facies with average and continuous amplitude poorly reflect alluvial sediments (5%) in the Northwest region. The direction of sediment transport is mainly from the Northwest and Southwest in the area. The sandstone sequences are distributed on the slopes of the lake and the lake bottom, which is potential reservoir.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 155--162
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geological Controls on Evolution of Submarine Channels in Song Hong Basin, Offshore Vietnam
    Autorzy:
    Le, Anh Ngoc
    Nguyen, Hoan Minh
    Nguyen, Muoi Duy
    Thi, Ngan Bui
    Powiązania:
    https://bibliotekanauki.pl/articles/24200703.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    Song Hong basin
    submarine channels
    channel complex
    3D seismic
    Opis:
    Song Hong basin is a very large basin with complicated onshore to offshore geological structure. The basin comprises the pre-Tertiary basement and Kainozoi sequences. This study focused on the evolution of submarine channel in Miocene sequence. The study interval is the major reservoir of the basin characterized as submarine channel complex and lower to Middle Miocene carbonates with the porosity of 15–25%. The channel is highly eroded into the substrate with c. 7 km wide and 20 km long, trending northwest-southeast. They are ‘U’ to ‘V’ shape, sub-parallel to deep faults which reactivated in the Early and Mid-Late Miocene. The channel deposit is characterized by cut and fill architecture and can be seen as high amplitude, bi-directional downlap. The channels are likely to be controlled by the two inverted phases in Late Oligocene and Middle-Late Miocene. The tectonic events are not only controls the flow directions but also modified the shape of the channels. The occurrence of well-developed submarine channel give a great hydrocarbon potential for the Song Hong basin.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 7--12
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption and Desorption Characteristics and Purification of Isoflavones from Crude Soybean Extract Using Macroporous Resins
    Autorzy:
    Tran, Thi N.
    Bui, Xuan V.
    Loan, Nguyen T.
    Anh, Nguyen H.
    Le, Truong D.
    Truong, Thi M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2051036.pdf
    Data publikacji:
    2022-06-09
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    soybean isoflavones
    macroporous resin
    purification
    adsorption and desorption characteristics
    daidzin
    genistin
    Opis:
    Isoflavones in soybean have been well-known with many health-promoting effects on humans. This study aimed to purify isoflavones from the crude soybean extract by the static adsorption/desorption process on macroporous resins. A screening test of four commercial resins: D101, AB-8, Amberlite(R) XAD4, and Diaion HP20 according to their adsorption/desorption characteristic for isoflavones was investigated. All four resins showed high adsorption and desorption characteristics in which D101 resin was chosen as the most suitable resin for purifying isoflavones. Compositional analysis showed that daidzin and genistin were the main isoflavones in the crude soybean extract. The adsorption isotherms data of total isoflavones, daidzin, and genistin fitted well with the Langmuir model with R2>0.98. The dynamic adsorption conditions for the purification process of isoflavones on the D101 resin-packed column were selected at the bed volume (BV) of 200 mL, feed volume of 3.75 BV, and flow rate of 1.5 BV/h. The dynamic desorption was carried out with the elution solution of 70% (v/v) ethanol, elution volume of 2.5 BV, and flow rate of 1 BV/h. The total isoflavone content in the purified extract was 8.70-fold higher than its initial content in the crude soybean extract with a recovery yield of nearly 80%. The study results reveal a strong possibility for large-scale production of isoflavones for further application in functional food products or pharmaceutical products.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2022, 72, 2; 183-192
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The measurement of successful management via a net profit maximization model with ten factors and financial accounting disclosure policy- case of Vinamilk in F&B Industry in Vietnam
    Autorzy:
    Nga, Le Thi Viet
    Lan, Nguyen Thi Ngoc
    Yen, Ly Lan
    Huy, Dinh Tran Ngoc
    Thuy, Do Minh
    Powiązania:
    https://bibliotekanauki.pl/articles/1818316.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    successful management
    profit maximization
    financial accounting data
    stock prices
    GDP growth
    inflationary
    risk free rate
    arket interest rate
    skuteczne zarządzanie
    maksymalizacja zysku
    dane księgowe
    kurs akcji
    wzrost PKB
    inflacja
    stopa procentowa
    Opis:
    When a firm has better disclosure policy of financial accounting information it will attract more investment. Many factors affecting accounting information disclosure policy include firm size, leverage, industry characteristics, investor types, etc. And good financial accounting data disclosure will help to reduce risk level of firms. At micro level, cost and net sale factors will affect net profit while at macro levels, risk free rate and exchange rate will impact. According to Nikkei Asian Review, Vinamilk (VNM) is the only brand in F&B industry and the domestic industry leader which ranked 25th among 300 listed companies in the List of ASIA300 Power Performers. It leads the organic trend in milk industry and has made very positive contributions to the overall achievements of economic and social values. Good business management requires us to consider the impacts of multi macro and micro factors on net profit, both internal and external factors, and it contributes to promoting business plan and economic policies for economic growth and stabilizing business operation. By data collection method through statistics, analysis, synthesis, comparison, quantitative analysis to generate qualitative comments and discussion; using econometric method to perform regression equation and evaluate quantitative results, the article analyzed and evaluated the impacts of ten (10) macroeconomic factors such as: stock price, VNIndex, risk free rate, lending rate, cost, sale, inflation, GPD growth, S&P500, exchange rate, etc. on net profit of a leading milk listed company, Vinamilk (VNM) in Vietnam in the 10-year period of 2010-2019, both positive and negative sides. From that regression model and analysis, it will draw leadership features, strengths of this industrial leader. The results of quantitative research, in a ten factor model, show that the decrease in GDP growth and risk free rate, inflation and increase in net sale will have a significant effect and increase VNM net profit, with the highest impact coefficient, the second is decreasing cost. This research finding and recommended policy also can be used as reference in policy for F&B system in many developing countries.
    Źródło:
    Management; 2020, 24, 2; 1-19
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water Lettuce (Pistia stratiotes L.) as a Potential Material for Biogas Production
    Autorzy:
    Cong, Nguyen Van
    Thanh, Tran Van
    Kha, Le Thi Mong
    Hoang, Nguyen Xuan
    Powiązania:
    https://bibliotekanauki.pl/articles/2105278.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    water lettuce
    anaerobic digestion
    renewable energy
    Opis:
    This study evaluated the biogas production potential of water lettuce (Pistia stratiotes L.) by batch anaerobic digestion under in-vitro conditions. Twenty-one litre-plastic jars were used to conduct 4 replications over 75 days. The results showed that solution temperature, pH and Eh were suitable for biogas production. More than 50% of the obtained CH4 was formed within 17–42 days after incubation. The maximum daily CH4 production was 0.052 L/gVS, whilst the daily H2S concentration was low, with a maximum value of 28 ppm within 14–21 d after incubation. Moreover, the peak of daily biogas production was seen at day 16 with production of 0.12 L/gVS. The results highlight that water lettuce biomass can be potentially used to produce high quality biogas in anaerobic incubation.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 6; 182--188
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of macro economic factors and financial development on energy projects - case in ASEAN countries
    Autorzy:
    Hanh, Hoang Thanh
    Huy, Dinh Tran Ngoc
    Phuong, Nguyen Thi Thanh
    Nga, Le Thi Viet
    Anh, Pham Tuan
    Powiązania:
    https://bibliotekanauki.pl/articles/1818318.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    countries ASEAN
    commerce
    financial development
    energy project
    macroeconomic
    macro politicies
    kraje ASEAN
    handel
    rozwój finansowy
    projekty energetyczne
    makroekonomia
    makropolityka
    Opis:
    ASEAN (The Association of SouthEast Asian Nations) demand on energy is depending on economic growth of each country, resources, and political and regulations of each country. This study aims to investigate the role of international trade, financial development, foreign direct investment (FDI) on the consumption of renewable energy (RE) in ASEAN countries of the world. The findings explore that positive nexus among the international trade, real output, financial development, foreign direct investment and consumption of RE. Last but not least, this paper will propose several recommendations and policy suggestion for ASEAN countries to manage and encourage better renewable energy projects in the region. One of its original value is that, in the globalization and integration era, environment pollution will affect all ASEAN countries and in the region, so these nations need to link together to implement renewable projects for environment protection and for further generation.
    Źródło:
    Management; 2020, 24, 2; 146-157
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    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:
    Flight Height of UAV and Its Influence on the Precise Digital Elevation Model of Complex Terrain
    Wysokość lotu UAV i jego wpływ na precyzyjny cyfrowy model wysokości złożonego terenu
    Autorzy:
    Bui, Xuan Nam
    Nguyen, Quoc Long
    Le, Thi Thu Ha
    Bui, Ngoc Quy
    Goyal, Ropesh
    Vo, Trong Hung
    Pham, Van Chung
    Cao, Xuan Cuong
    Le, Van Canh
    Le, Hong Viet
    Powiązania:
    https://bibliotekanauki.pl/articles/319327.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    UAV
    DEM
    accuracy
    complex terrain
    open-pit mines
    dokładność
    złożony teren
    kopalnie odkrywkowe
    Opis:
    The application of lightweight Unmanned Aerial Vehicle (UAV) has been increasingly common in 3D topographic surveys. Especially in the complex terrains such as open-pit mines, where the elevation is rapidly undulating, the UAV based mapping is more efficient, economic and safe compared to the conventional methods. However, one of the most important factors in UAV mapping of complex terrain is the flight altitude which needs to be seriously considered because of the safety and accuracy of generated DEMs. This paper aims to evaluate the influence of flight height on accuracy of DEMs generated for open-pit mines. For this purpose, the selected study area is a quarry with complex terrain located in the Northern Vietnam. The investigation was conducted with five flight heights of 50 m, 100 m, 150 m, 200 m, and 250 m. To assess the accuracy of resulting DEMs, 10 ground control points and 385 checkpoints measured by both GNSS/RTK and total station methods were used. The accuracy of DEM was assessed by using root-mean-square error (RMSE) in X, Y, Z, XY, and XYZ components. The result showed that the DEM models generated at the flight heights of less than 150 m have high accuracy, RMSEs on the 10 GCPs increased from 1.8 cm to 6.2 cm for vertical (Z), and from 2.6 cm to 6.3 cm for horizontal (XY), whereas RMSE on 385 checkpoints increases gradually from 0.05 m to 0.15 m for vertical (Z) when the height flight increased from 50 m to 250 m.
    Zastosowanie lekkich bezzałogowych statków powietrznych (UAV) jest coraz bardziej powszechne w badaniach topograficznych 3D. Zwłaszcza w skomplikowanych terenach, takich jak kopalnie odkrywkowe, w których wzniesienie gwałtownie faluje, mapowanie oparte na UAV jest bardziej wydajne, ekonomiczne i bezpieczne w porównaniu z metodami konwencjonalnymi. Jednak jednym z najważniejszych czynników w mapowaniu UAV złożonego terenu jest wysokość lotu, którą należy poważnie rozważyć ze względu na bezpieczeństwo i dokładność generowanych DEM. Niniejszy artykuł ma na celu ocenę wpływu wysokości lotu na dokładność DEM generowanych dla kopalni odkrywkowych. W tym celu wybranym obszarem badawczym jest kamieniołom o złożonym terenie położony w północnym Wietnamie. Badanie przeprowadzono przy pięciu wysokościach lotu 50 m, 100 m, 150 m, 200 m i 250 m. Aby ocenić dokładność uzyskanych DEM, wykorzystano 10 naziemnych punktów kontrolnych i 385 punktów kontrolnych mierzonych zarówno metodami GNSS/RTK, jak i metodami stacji całkowitej. Dokładność DEM oceniono za pomocą błędu pierwiastkowego średniego kwadratu (RMSE) w komponentach X, Y, Z, XY i XYZ. Wynik pokazał, że modele DEM generowane na wysokościach lotu poniżej 150 m mają wysoką dokładność, RMSE na 10 GCP wzrosły z 1,8 cm do 6,2 cm dla pionu (Z) i od 2,6 cm do 6,3 cm dla poziomu (XY), podczas gdy RMSE na 385 punktach kontrolnych wzrasta stopniowo z 0,05 m do 0,15 m dla pionu (Z), gdy lot na wysokości wzrósł z 50 m do 250 m.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 1; 179-186
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response surface methodology for optimization studies of hydro-distillation of essential oil from pixie mandarin (Citrus reticulata Blanco) peels
    Autorzy:
    Tan, Phat Dao
    Ngo, Thi Cam Quyen
    Tran, Thi Yen Nhi
    Chi, Cuong Nguyen
    Trung, Thanh Nguyen
    Xuan, Tien Le
    Powiązania:
    https://bibliotekanauki.pl/articles/2081508.pdf
    Data publikacji:
    2021
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Hydro-distillation
    pixie mandarin oil (Citrus reticulata Blanco)
    RSM
    GC-MS
    Opis:
    Essential oil extraction technique from mandarin pixie peels by hydro-distillation is optimized by respon-se surface methodology (RSM). Mathematical techniques were used in experimental design to evaluate the impacts of factors that affect the extraction process and improve the yield of the extraction process. A central mixed design based on infl uencing variables such as water ratio (3–5 mL/g), temperature (110–130° C) and extraction time (90–150 min) was adopted with essential oil yield as the target func-tion. Correlation analysis of the mathematical regression model showed that the quadratic polynomial model can be used to optimize hydro-distillation of pixie mandarin oil. The results showed that under the optimum extraction conditions, the highest quantity of essential oils was achieved (7.28 mL/100 g materials). In terms of statistical analysis, the signifi cance levels (p-value <0.05) of the model showed that the experimental results had a good impact between factors. The coeffi cient of determination indicating the match between the experimental value and the predicted value of the model was high (R2>0.9). The chemical composition of the essential oil was analyzed by Gas Chromatography-Mass Spectrometry, revealing the dominance of limonene content (97.667%), which implies that the essential oil of pixie mandarin could be an alternative source of limonene.
    Źródło:
    Polish Journal of Chemical Technology; 2021, 23, 4; 26-34
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of FLY-ROCK DISTANCe as a Function of Blast Conditions: a Case Study in Vietnam
    Symulacja odległości między odrzucającymi skałami jako funkcją warunkową techniki strzelniczej: studium przypadku w Wietnamie
    Autorzy:
    Nguyen, Anh Tuan
    Pham, Van Hoa
    Pham, Van Viet
    Tran, Dinh Bao
    Le, Thi Hai
    Powiązania:
    https://bibliotekanauki.pl/articles/318683.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    quarry
    blasting
    fly-rock distance
    non-smooth discrete element method (NSCD)
    simulation
    kamieniołom
    technika strzelnicza
    odrzucające skały
    metoda elementów dyskretnych nie-gładkich (NSCD)
    symulacja
    Opis:
    The prediction of fly-rock distances is a big problem in the blasting areas of open-pit mines. The fly-rock distance plays a crucial role in the reduction and control of blasting accidents in quarries. This paper proposes the modelling of the contact dynamics as a non-smooth discrete element method (NSCD). Then, the fly-rock phenomenon is simulated using this NSCD method. This approach was to develop a model that correlates to blast conditions, initial fly-rock/rock-fall velocities and permits the computation of fly-rock range from randomization orbits. The results showed that the NSCD method is a good means for the simulation with the variability of blasting parameters. This method is to relate the initial fly-rock velocity to blast conditions and then uses ballistic trajectories to compute the maximum fly-rock distance. Finally, it should be noted that the proposed simulation of fly-rock trajectories which shows the distribution of fly-rock bounce heights above the ground level with the different coefficient of restitution range as a function of blast conditions. It should be used in the Ninh Dan limestone quarry belonging to the Song Thao Cement, Phu Tho province (Vietnam), and it should be directly used in the same other quarries.
    Przewidywanie odległości między odrzucającymi skałami ma duży problem w kopalniach odkrywkowych. Odległość między skałami odrzucającymi odgrywa niezwykłą rolę w ograniczaniu i kontrolowaniu wypadków spowodowanych robotami strzelniczymi w kamieniołomach. W artykule, zaproponowano modelowanie dynamiki kontaktu jako metodę elementów dyskretnych Non-Smooth (NSCD). Następnie symuluje się zjawisko fly-rock metodą NSCD. Zastosowane podejście polegało na opracowaniu modelu, który kore-luje warunki wybuchów, początkowe prędkości lotnych skał i pozwala na obliczenie zasięgu fali z orbity losowej. Wyniki pokazały, że NSCD jest dobrym środkiem do symulacji przy zmienności parametrów strzałów. Ta metoda zastosowana w niniejszych badaniach polega na powiązaniu początkowej prędkości latających skał z warunkami wybuchu, a następnie wykorzystaniu trajektorii balistycznych do obliczenia maksymalnej odległości między latającymi skałami. Na koniec należy zauważyć, że zaproponowano symulację trajektorii odrzucających skał, która pokazuje rozkłady wysokości odbijania skał nad poziomem ziemi przy różnym współczynniku zakresu restytucji w funkcji warunków techniki strzelniczej. Powinien być stosowany w kamieniołomie wapienia Ninh Dan należącym do cementu Song Thao w prowincji Phu Tho (Wietnam) i powinien być stosowany w podobnych kamieniołomach.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 275-282
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of ownership concentration on the innovation of small and medium-sized enterprises
    Wpływ koncentracji własności na innowacyjność małych i średnich przedsiębiorstw
    Autorzy:
    Oanh, Dao Le Kieu
    Nguyen, Hong Thu
    Linh, Nguyen Tran Xuan
    Nhan, Do Thi Thanh
    Powiązania:
    https://bibliotekanauki.pl/articles/27315295.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    ownership concentration
    innovation
    SMEs
    FDI
    Bayes
    koncentracja własności
    innowacje
    MŚP
    BIZ
    Opis:
    The study was conducted to assess the impact of ownership concentration on the innovation of Small and Medium-sized Enterprises (SMEs) in Vietnam. Furthermore, innovation is seen as an important element in creating competitiveness to achieve long-term development for a company. This topic has been reported in many previous pieces of research where innovation is often measured through the number of patents. However, this study measures the innovation of SMEs through whether these businesses introduce products/services or introduce a new production process or new technology in 3 years. By Logit Bayes regression method, the research results show that ownership concentration harms the innovation of SMEs in Vietnam. The authors explain this result through channels like "access to capital" and the "Risk aversion" channels.
    Badanie przeprowadzono w celu oceny wpływu koncentracji własności na innowacyjność małych i średnich przedsiębiorstw (MŚP) w Wietnamie. Ponadto innowacyjność postrzegana jest jako ważny element tworzenia konkurencyjności w celu osiągnięcia długoterminowego rozwoju firmy. Ten temat został poruszony w wielu poprzednich badaniach, w których innowacyjność jest często mierzona liczbą patentów. Jednak badanie to mierzy innowacyjność MŚP poprzez to, czy te firmy wprowadzają produkty/usługi lub wprowadzają nowy proces produkcyjny lub nową technologię w ciągu 3 lat. Wyniki badań metodą regresji Logit Bayes pokazują, że koncentracja własności szkodzi innowacyjności MŚP w Wietnamie. Autorzy wyjaśniają ten wynik kanałami, takimi jak „dostęp do kapitału” i „niechęć do ryzyka”.
    Źródło:
    Polish Journal of Management Studies; 2022, 25, 1; 312--326
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined YOLOv5 and HRNet for high accuracy 2D keypoint and human pose estimation
    Autorzy:
    Nguyen, Hung-Cuong
    Nguyen, Thi-Hao
    Nowak, Jakub
    Byrski, Aleksander
    Siwocha, Agnieszka
    Le, Van-Hung
    Powiązania:
    https://bibliotekanauki.pl/articles/2147147.pdf
    Data publikacji:
    2022
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    YOLOv5
    HRNet
    2D key points estimation
    2D human pose estimation
    Opis:
    Two-dimensional human pose estimation has been widely applied in real-world applications such as sports analysis, medical fall detection, human-robot interaction, with many positive results obtained utilizing Convolutional Neural Networks (CNNs). Li et al. at CVPR 2020 proposed a study in which they achieved high accuracy in estimating 2D keypoints estimation/2D human pose estimation. However, the study performed estimation only on the cropped human image data. In this research, we propose a method for automatically detecting and estimating human poses in photos using a combination of YOLOv5 + CC (Contextual Constraints) and HRNet. Our approach inherits the speed of the YOLOv5 for detecting humans and the efficiency of the HRNet for estimating 2D keypoints/2D human pose on the images. We also performed human marking on the images by bounding boxes of the Human 3.6M dataset (Protocol #1) for human detection evaluation. Our approach obtained high detection results in the image and the processing time is 55 FPS on the Human 3.6M dataset (Protocol #1). The mean error distance is 5.14 pixels on the full size of the image (1000×1002). In particular, the average results of 2D human pose estimation/2D keypoints estimation are 94.8% of PCK and 99.2% of PDJ@0.4 (head joint). The results are available.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2022, 12, 4; 281--298
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Mulberry Pomace Addition and Transglutaminase Treatment on the Quality of Pasta Enriched with Antioxidants and Dietary Fiber
    Autorzy:
    Ta, Thi Minh Ngoc
    Hoang, Chi Hieu
    Nguyen, Thao Mi
    Tran, Thi Thu Tra
    Ton, Nu Minh Nguyet
    Van Viet Man, Le
    Powiązania:
    https://bibliotekanauki.pl/articles/24024618.pdf
    Data publikacji:
    2023-10-10
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    antioxidant
    dietary fiber
    mulberry pomace
    pasta
    transglutaminase
    Opis:
    Mulberry pomace powder, a by-product of mulberry juice processing, was added to pasta recipe to make pasta with high dietary fiber and antioxidant contents. The effects of mulberry pomace ratio on the nutritional, textural and cooking properties as well as the sensory overall acceptance of the product were investigated. A significant increment in dietary fiber and total anthocyanin contents as well as decrement in cooking quality, texture and color change were observed. The cooking loss increased with the substitution level of mulberry pomace while the optimal cooking time, swelling index and water absorption index decreased. The quality improvement of 10% mulberry pomace fortified pasta was investigated by adding a transglutaminase preparation with enzyme dosage from 0.25 to 1.00 U/g protein. The fortified pasta treated with transglutaminase at 0.50 U/g protein showed a significant improvement in chewiness, tensile strength and elongation rate but was not significantly affected in terms of the swelling index and water absorption. The use of transglutaminase also improved the overall acceptability of the fortified pasta. Mulberry pomace powder may, therefore, be considered a potential antioxidant-rich and dietary fiber-rich material for incorporation into pasta products.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2023, 73, 4; 301-310
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow Assurance Study on Offshore Marginal Oil Field Development in Vietnam: The Case of Ca Ngu Vang Oil Field
    Badanie zapewnienia rozwoju przepływu w przybrzeżnych marginalnych pól naftowych w Wietnamie: Studium przypadku pola naftowego Ca Ngu Vang
    Autorzy:
    Nguyen, Van Tinh
    Nguyen, Thi Hai Yen
    Trinh, Tien Thang
    Tong, Canh Son
    Le, Dinh Hoe
    Powiązania:
    https://bibliotekanauki.pl/articles/318493.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    marginal field
    flow assurance
    pipeline
    Ca Ngu Vang
    pole marginalne
    zapewnienie przepływu
    rurociąg
    Opis:
    Over the last few years, PetroVietnam has discovered and exploited several marginal oil fields such as Ca Ngu Vang, Te Giac Trang, Hai Su Den, Hai Su Trang, etc. however the reserves are modest. Test results received during drilling exploratory wells within these fields indicated that the maximum total daily production rate from the wells could promisingly range to about 20,000 barrels of oil per day (BOPD). Unfortunately, the optimum development of these offshore oil fields still offers numerous challenges to oil engineers due to the limitations of equipment and technology. Oil production activities worldwide show that if the daily production of an offshore oilfield is less than 20,000 BOPD, a connection of the marginal fields to their nearest larger oil field should be taken into consideration in order to efficaciously recover more crude oil. Often, this method of production requires a long subsea pipeline system. Besides, the transportation of the fluids from these fields to the processing platform will undergo several serious problems caused by the deposition of wax. All these matters should be handled to guarantee the performance of transportation. A number of models using PIPESIM, PIPEPHRASE and OLGA have been applied to design and examine the operations of the subsea pipeline in different working conditions. Results of the simulations proposed the use of passive insulation to economically eliminate wax deposition and recommended proper pipeline shutdown operations to minimize several problems related to flow assurance issues in the region of interest.
    W ciągu ostatnich kilku lat w Vietnamie odkryto i eksploatowano kilka marginalnych pól naftowych, takich jak Ca Ngu Vang, Te Giac Trang, Hai Su Den, Hai Su Trang, itd.… Jednak zasoby są skromne. Wyniki testów otrzymane podczas wiercenia odwiertów poszukiwawczych na tych polach wykazały, że maksymalny całkowity dzienny poziom wydobycia z odwiertów może potencjalnie sięgać około 20 000 baryłek ropy dziennie (BOPD). Niestety, optymalny rozwój tych przybrzeżnych pól naftowych nadal stwarza liczne wyzwania dla inżynierów naftowych ze względu na ograniczenia sprzętu i technologii. Działalność wydobywcza ropy naftowej na całym świecie pokazuje, że jeśli dzienna produkcja morskiego pola naftowego jest mniejsza niż 20 000 BOPD, należy wziąć pod uwagę połączenie pól marginalnych z ich najbliższym większym polem naftowym, aby efektywnie odzyskać więcej ropy. Często ta metoda produkcji wymaga długiego systemu rurociągów podmorskich. Poza tym transport płynów z tych pól na platformę obróbkową będzie wiązał się z kilkoma poważnymi problemami spowodowanymi osadzaniem się wosku. Wszystkie te sprawy powinny być załatwione, aby zagwarantować wykonanie transportu. Szereg modeli wykorzystujących PIPESIM, PIPEPHRASE i OLGA zostało zastosowanych do projektowania i badania działania rurociągu podmorskiego w różnych warunkach pracy. W wynikach symulacji zaproponowano zastosowanie izolacji pasywnej w celu ekonomicznego wyeliminowania osadzania się wosku oraz zalecono prawidłowe operacje wyłączania rurociągu, aby zminimalizować kilka problemów związanych z kwestiami zapewnienia przepływu w obszarze zainteresowania.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 15-22
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antioxidant, Anti-Tyrosinase, and Wound-Healing Capacities of Soy Protein Hydrolysates Obtained by Hydrolysis with Papaya and Cantaloupe Juices Showing Proteolytic Activity
    Autorzy:
    Nguyen, Thi-Phuong
    Le, Quang T.
    Tran, Mai Linh T.
    Ta, Kim Nhung
    Nguyen, Khoa T.
    Powiązania:
    https://bibliotekanauki.pl/articles/28408445.pdf
    Data publikacji:
    2024-01-22
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    antiradical activity
    cantaloupe fruit
    fibroblast model
    degree of hydrolysis
    papain
    papaya fruit
    soy protein isolate
    tyrosinase inhibition
    Opis:
    Purified and crude proteases have been broadly applied to obtain hydrolysates from soy protein isolate (SPI) with the improved functional and biological properties. However, the use of fruit juices containing native proteases to produce SPI hydrolysates with better bioactivities receives less attention. The present study attempted to investigate the ability of papaya (Carica papaya) and cantaloupe (Cucumis melo) juices in the hydrolysis of SPI and assess the antioxidant, anti-tyrosinase, and wound-healing activities of obtained hydrolysates. Our analysis showed that SPI was hydrolysed by papaya juice, at the juice to substrate ratio of 2.5:2 (v/w), with a degree of hydrolysis (DH) of approximately 11% after 4 h of treatment at 55ºC. A higher DH (about 26%) was obtained by the hydrolysis with cantaloupe juice at the same juice to substrate ratio and treatment conditions. Papain used at the enzyme to substrate ratio of 0.625:2 (w/w) broke down SPI in a similar DH as papaya juice at the juice to substrate ratio of 2.5:2 (v/w). The ABTS•+-scavenging, •OH-scavenging and tyrosinase inhibitory capacities of SPI were lower than those of hydrolysates obtained by the treatment with papaya juice (IC50 of 2.39, 7.17, and 32.07 μg/mL, respectively) and cantaloupe juice (IC50 of 2.46, 6.93, and 30.49 μg/mL, respectively). An enhancement in ABTS•+-scavenging, •OH-scavenging and anti-tyrosinase activities was also observed in the hydrolysate obtained by papain (IC50 of 2.75, 17.85, and 117.80 μg/mL, respectively) compared to SPI. However, the increased level of the •OH-scavenging capacity of the hydrolysate obtained by papain was lower than that of the fruit juice-treated samples. Remarkably, the hydrolysates prepared from the hydrolysis with fruit juices accelerated the wound closure in human fibroblasts by estimately 1.5 times after 24 h of treatment while this property was not observed in the hydrolysate by papain. Our study data suggest the potential of SPI hydrolysates obtained by papaya and cantaloupe juices in the preparation of healthy food products.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2024, 74, 1; 5-15
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigation of length to beam ratio effects on ship resistance using ranse method
    Autorzy:
    Le, Tat Hien
    Nguyen, Duy Anh
    Tran, Ngoc Tu
    Hoa, Nguyen Thi Ngọc
    Ngoc, Vu Minh
    Powiązania:
    https://bibliotekanauki.pl/articles/32917972.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    length-beam ratio
    L/B
    resistance
    hull form
    RANSE
    Opis:
    The paper discusses the length to beam (L/B) ratio effects on ship resistance at three different Froude numbers using unsteady RANSE simulation. First, the JBC ship model was used as an initial hull form for verification and validation of predicted ship resistance results with measured data, and then the influence of the L/B ratio on ship resistance was carried out. Ship hull forms with different L/B ratios were produced from the initial one by using the Lackenby method. The numerical results obtained show the L/B ratio’s effect on ship resistance. Increases of the L/B ratio led to gradual reduction of the total ship resistance and vice versa. Analysis of the changing of the resistance components indicates that the pressure resistance changes are considerably larger than the frictional one. Finally, the paper analyses the difference in the flow field around the hull of the ship with variation of the L/B ratio to fully understand the physical phenomenon in the change of ship resistance at different L/B parameters.
    Źródło:
    Polish Maritime Research; 2023, 1; 13-24
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    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:
    Numerical investigating the effect of water depth on ship resistance using RANS CFD method
    Autorzy:
    Hoa, Nguyen Thi Ngoc
    Vu, Bich Ngoc
    Tran, Ngoc Tu
    Chien, Nguyen Manh
    Le, Tat Hien
    Powiązania:
    https://bibliotekanauki.pl/articles/259677.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship resistance
    shallow water
    RANS
    Opis:
    On inland waterways the ship resistance and propulsive characteristics are strictly related to the depth of the waterway, thus it is important to have an understanding of the influence of water depth on ship hydrodynamic characteristics. Therefore, accurate predictions of hydrodynamic forces in restricted waterways are required and important. The aim of this paper is investigating the capability of the commercial unsteady Reynolds– Averaged Navier–Stokes (RANS) solver to predict the influence of water depth on ship resistance. The volume of fluid method (VOF) is applied to simulate the free surface flow around the ship. The hull resistance in shallow and deep water is compared. The obtained numerical results are validated against related experimental studies available in the literature.
    Źródło:
    Polish Maritime Research; 2019, 3; 56-64
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement in extraction and sensory properties of soapnut extract by fermentation
    Autorzy:
    Le, Xuan-Tien
    Tran-Thi, Tuong-An
    Phuong, Kieu-Trang
    Nguyen-Kim, Minh-Tam
    Dao, Tan Phat
    Powiązania:
    https://bibliotekanauki.pl/articles/27315636.pdf
    Data publikacji:
    2023
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Saponin
    Sapindus mukorossi
    fermentation
    Saccharomyces cerevisiae
    Opis:
    Sapindus saponins are potential biosurfactants that can widely be used to replace many chemical cleaning products. This study aimed to investigate the water extraction of saponins from the pericarps of Sapindus mukorossi and enhance the sensory properties of the extract by yeast fermentation. Extraction conditions including temperature, solid-to-liquid ratio, extraction time, and number of extraction times were studied. A yield of 21.4% was obtained by 2 h of extraction at 80 °C with a solid-to-liquid of 1/6 (w/v) and two times. Fermentation was used to purify the Sapindus extract, inoculum amount and fermentation time were optimized. The fermentation by S. cerevisiae (2%) within 4 days significantly improved the color and smell of aqueous extract, turbidity decreased by 75.6%, total sugar content decreased by nearly 50% and saponins content slightly decreased. These results could contribute to the development of industrial–scale production of Sapindus saponins.
    Źródło:
    Polish Journal of Chemical Technology; 2023, 25, 2; 1--7
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing the Performance of Phase-Change Materials in Personal Protective Clothing Systems
    Autorzy:
    Reinertsen, R. E.
    Ferevik, H.
    Holbo, K.
    Nesbakken, R.
    Reitan, J.
    Royset, A.
    Le Thi, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/90712.pdf
    Data publikacji:
    2008
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    phase change materials (PCMs)
    protective clothing
    thermal stress
    Opis:
    Phase-change materials (PCM) can be used to reduce thermal stress and improve thermal comfort for workers wearing protective clothing. The aim of this study was to investigate the effect of PCM in protective clothing used in simulated work situations. We hypothesized that it would be possible to optimize cooling performance with a design that focuses on careful positioning of PCM, minimizing total insulation and facilitating moisture transport. Thermal stress and thermal comfort were estimated through measurement of body heat production, body temperatures, sweat production, relative humidity in clothing and subjective ratings of thermal comfort, thermal sensitivity and perception of wetness. Experiments were carried out using 2 types of PCM, the crystalline dehydrate of sodium sulphate and microcapsules in fabrics. The results of 1 field and 2 laboratory experimental series were conclusive in that reduced thermal stress and improved thermal comfort were related to the amount and distribution of PCM, reduced sweat production and adequate transport of moisture.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2008, 14, 1; 43-53
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developing a Set of Criteria for Prioritising GHG Emission Reduction Measures in Metallurgical Sector
    Opracowanie zestawu kryteriów ustalania priorytetów środków redukcji emisji gazów cieplarnianych w sektorze metalurgicznym
    Autorzy:
    Tran, Xuan Truong
    Tran, Thanh Ha
    Le, Thanh Nghi
    Nguyen, Nhu Hung
    Do, Thi Thanh Nga
    Vuong, Xuan Hoa
    Powiązania:
    https://bibliotekanauki.pl/articles/318093.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    prioritising mitigation measures
    Delphi method
    metallurgical sector
    priorytetyzacja działań łagodzących
    metoda Delphi
    sektor metalurgiczny
    Opis:
    Prioritizing climate change mitigation measures could help to identify most feasible or most nationally appropriated mitigation actions. This process can also provide important inputs for the development of national climate change strategies or policies. The paper applies Delphi method to prioritize criteria for potential climate change mitigation technology in the metallurgical sector in Vietnam. The consultation process has been done with ten experts in only two cycle to reach Kendall (W) value over 0.5. Then, 11 out of 21 criteria have been selected for Multi-Criteria Decision Analysis (MCDA) in prioritizing mitigation options in iron and steel, lead, zinc, tin and aluminium productions. Mitigation options with highest scores will be proposed for mitigation target of the metallurgical sector which could be inputs for NDC of industrial sector. The selected criteria include 01 indicator in emission reduction (GPT1), 01 indicator in environmental impacts (MT1), 01 indicators in social impacts (XH3), 02 indicators in economic impacts (KT1, KT2), 02 indicators in sustainable development impacts (PTBV1, PTBV2) and 04 indicators in MRV (MRV1, MRV2, MRV3, MRV4).
    Nadanie priorytetu środkom łagodzenia zmiany klimatu może pomóc w zidentyfikowaniu najbardziej wykonalnych lub najbardziej odpowiednich na szczeblu krajowym działań łagodzących. Proces ten może również stanowić ważny wkład w rozwój krajowych strategii lub polityk w zakresie zmian klimatu. W artykule, zastosowano metodę Delphi do priorytetyzacji kryteriów dotyczących potencjalnej technologii łagodzenia zmian klimatycznych w sektorze metalurgicznym w Wietnamie. Proces konsultacji został przeprowadzony z 10 ekspertami w zaledwie dwóch cyklach, aby osiągnąć wartość Kendalla (W) powyżej 0,5. Następnie 11 z 21 kryteriów zostało wybranych do analizy decyzji wielokryterialnej (MCDA) w ustalaniu priorytetów opcji łagodzenia w produkcji żelaza i stali, ołowiu, cynku, cyny i aluminium. Opcje łagodzenia z najwyższymi wynikami zostaną zaproponowane jako cel łagodzenia dla sektora metalurgicznego, który mógłby stanowić wkład dla NDC sektora przemysłowego. Wybrane kryteria obejmują 01 wskaźnik redukcji emisji (GPT1), 01 wskaźnik wpływu na środowisko (MT1), 01 wskaźniki wpływu społecznego (XH3), 02 wskaźniki skutków gospodarczych (KT1, KT2), 02 wskaźniki wpływu na zrównoważony rozwój (PTBV1 , PTBV2) i 04 wskaźników w MRV (MRV1, MRV2, MRV3, MRV4).
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 247-254
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Suplement nr 2 2018
    Autorzy:
    Ludwik, Malinowski,
    Kornelia, Czerwińska,
    Mirosław, Michalik,
    Stanisław, Milewski,
    Katarzyna, Kaczorowska-Bray,
    Anna, Solak,
    Iwona, Myśliwczyk,
    LE, THI THUY HANG,
    Powiązania:
    https://bibliotekanauki.pl/articles/903740.pdf
    Data publikacji:
    2018-12-21
    Wydawca:
    Akademia Pedagogiki Specjalnej im. Marii Grzegorzewskiej. Wydawnictwo APS
    Tematy:
    special school
    Opis:
    special school
    Źródło:
    Szkoła Specjalna; 2018, LXXIX(2 Supplement); 1-56
    0137-818X
    Pojawia się w:
    Szkoła Specjalna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of social marketing on attitudes and behavior related to road traffic in Hanoi city
    Autorzy:
    Nhung, Ngo Thi Hong
    Hai, Do Huu
    Dung, Vu Tri
    Thong, Le Ngoc
    Trung, Pham Quang
    Cuong, Nguyen Hung
    Powiązania:
    https://bibliotekanauki.pl/articles/27314064.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    social marketing
    attitude
    behavior
    road traffic
    marketing społeczny
    postawa
    zachowanie
    ruch drogowy
    Opis:
    Dangerous and risky actions while traveling on traffic routes that threaten the health, spirit and life of vehicle drivers and others. However, to raise community awareness, make them care about traffic safety behavior takes time and influence attitudes to create behavior change in a sustainable way. Research based on Ajzen’s theory of planned behavior [1, 2] and the theory of social marketing was conducted to identify the factors influencing the road traffic attitudes and behaviors of people in Hanoi and the degrees of their influence. The results show that road traffic attitudes are affected, in descending order, by partnership, resources, distribution, promotion, price, product, and public. The road traffic behavior of people is determined, in descending order, by age, moderator variables (the law and the validity of the law and weather), attitude, and education level. Based on the results, several recommendations to government officials and policymakers have been made.
    Źródło:
    Transport Problems; 2023, 18, 1; 193--202
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Lasso and Elastic-Net Regularized Generalized Linear Model for Predicting Blast-Induced Air Over-pressure in Open-Pit Mines
    Model Lasso i uogólniony model liniowy elastycznej siatki do prognozowania nadciśnienia wywołanego wybuchem w kopalniach odkrywkowych
    Autorzy:
    Bui, Xuan‑Nam
    Nguyen, Hoang
    Tran, Quang Hieu
    Bui, Hoang‑Bac
    Nguyen, Quoc Long
    Nguyen, Dinh An
    Le, Thi Thu Hoa
    Pham, Van Viet
    Powiązania:
    https://bibliotekanauki.pl/articles/318532.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    Lasso model
    kopalnia odkrywkowa
    wybuchy
    open pit mines
    explosives
    Opis:
    Air overpressure (AOp) is one of the products of blasting operations in open-pit mines which have a great impact on the environment and public health. It can be dangerous for the lungs, brain, hearing and the other human senses. In addition, the impact on the surrounding environment such as the vibration of buildings, break the glass door systems are also dangerous agents caused by AOp. Therefore, it should be properly controlled and forecasted to minimize the impacts on the environment and public health. In this paper, a Lasso and Elastic-Net Regularized Generalized Linear Model (GLMNET) was developed for predicting blast-induced AOp. The United States Bureau of Mines (USBM) empirical technique was also applied to estimate blast-induced AOp and compare with the developed GLMNET model. Nui Beo open-pit coal mine, Vietnam was selected as a case study. The performance indices are used to evaluate the performance of the models, including Root Mean Square Error (RMSE), Determination Coefficient (R2), and Mean Absolute Error (MAE). For this aim, 108 blasting events were investigated with the Maximum of explosive charge capacity, monitoring distance, powder factor, burden, and the length of stemming were considered as input variables for predicting AOp. As a result, a robust GLMNET model was found for predicting blast-induced AOp with an RMSE of 1.663, R2 of 0.975, and MAE of 1.413 on testing datasets. Whereas, the USBM empirical method only reached an RMSE of 2.982, R2 of 0.838, and MAE of 2.162 on testing datasets.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 2/2; 8-20
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method of Defining the Parameters for UAV Point Cloud Classification Algorithm
    Metoda wyznaczania parametrów do opracowania metod klasyfikacji danych chmur punktów zbudowanych z obrazów BSP
    Autorzy:
    Bui, Ngoc Quy
    Le, Dinh Hien
    Nguyen, Quoc Long
    Tong, Si Son
    Duong, Anh Quan
    Pham, Van Hiep
    Phan, Thanh Hai
    Pham, Thi Lan
    Powiązania:
    https://bibliotekanauki.pl/articles/318963.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    UAV
    point cloud
    classification algorithms
    open-pit mines
    BSP
    chmura punktów
    algorytmy klasyfikacyjne
    kopalnie odkrywkowe
    Opis:
    Image data from Drones/Unmanned Aerial Vehicles (UAVs) has been studied and used extensively for establishing maps. The process of UAV data provides three main products including (Digital Surface Model) DSM, Point cloud and Ortho-photos, in which point cloud is a valuable data source in building 3D models and topographic surfaces as well. However, processing point cloud separately to achieve secondary products has not been received much attention from researchers. This study determines parameters to develop a method for classifying point cloud data constructed from UAV images. Consequently, A 3D surface of the ground is built by applying a developed algorithm for the point cloud data for an open-pit mine. The temporal or non-ground objects such as trees, houses, vehicles are automatically subtracted from the point cloud by the algorithms. According to this line, it is possible to calculate and analyze the amount of reserves, the exploited volume to evaluate the efficiency for each mine during operation with the support of UAV integrated camera.
    Dane uzyskane z dronów / bezzałogowych statków powietrznych (BSP) zostały zbadane i powszechnie wykorzystane do opracowania map. Przetwarzanie danych z BSP zapewnia trzy główne produkty, a mianowicie: Model numeryczny powierzchni (MNS), chmurę punktów i ortofotomapy, w których chmura punktów jest cennym źródłem danych przy budowaniu modeli 3D i powierzchni topograficznych. Dotychczas, kwestia przetwarzania chmury punktów osobno w celu uzyskania produktów wtórnych nie wzbudziła większego zainteresowania naukowców. W artykule, przedstawiono wyniki badania nad sposobem wyznaczenia parametrów niezbędnych do opracowania metod klasyfikacji danych chmur punktów zbudowanych z obrazów BSP. W efekcie tego procesu, powstaje trójwymiarowa powierzchnia powierzchni poprzez zastosowanie opracowanego algorytmu dla danych chmury punktów w kopalni odkrywkowej. Na tej podstawie, można służyć do pomiarów inwentaryzacyjnych, bieżącej kontroli zgodności postępu eksploatacji górniczej z planem ruchu zakładu górniczego, prowadzenia pomiarów postępu frontu eksploatacji w złożu oraz frontów, obejmujących proces zdejmowania nadkładu oraz wyeksploatowanego złoża.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 49-56
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new environmentally friendly chemical mechanical polishing method applied for surface finishing Ti-6Al-4V alloy
    Autorzy:
    Quang, Nguyen Minh
    Quan, Nguyen Ngoc
    Mai, Nguyen Trong
    Thanh, Le Thi Phuong
    Tung, Nguyen Tien
    Tan, Tran Ngoc
    Hai, Ha Thanh
    Trinh, Nguyen Duy
    Powiązania:
    https://bibliotekanauki.pl/articles/28407325.pdf
    Data publikacji:
    2023
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    chemical-mechanical polishing
    hydrogen peroxide
    TI-6AL-4V
    silica
    malic acid
    Opis:
    A new eco-friendly slurry has been developed for the chemical mechanical polishing process with a solution of malic acid, deionized water, and an oxidizing agent hydrogen peroxide (H2O2). The surface quality of Ti-6Al-4V workpieces with the proposed chemical mechanical polishing slurry with optimal parameters include oxidizers (H2O2), colloidal (SiO2) slurry, and deionized water by weight 8%, 45%, and 47% respectively, the pH concentration is adjusted 4 through the malic acid content present in the slurry. Experimental results obtained with the proposed chemical mechanical polishing method show a more improved surface quality than previous studies when applying for polishing Ti-6Al-4V alloy. The developed chemical mechanical polishing method's polishing results under optimal conditions obtain an ultra-fine surface quality with Ra = 0.696 nm over a measuring area of 53×70 μm2. X-ray photoelectron (XPS) and electrochemical measurements were used to study the chemical reaction mechanisms in the proposed chemical mechanical polishing process. The chemical mechanical polishing processes for the surface of the Ti-6Al-4V alloy workpiece with the H2O2 oxidizing agent showed high suitability with the reactants formed on the surface such as Ti, V, and Al oxide. With the proposed oxidant and the established chemical mechanical polishing slurry, the feasibility and surface quality of the super smooth Ti-6Al-4V workpiece formed after polishing were demonstrated. The established chemical mechanical polishing method shows high applicability in environmental protection and Ti-6Al-4V alloy ultra-precision machining industries.
    Źródło:
    Journal of Machine Engineering; 2023, 23, 4; 64--76
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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