Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Nguyen, Tran" wg kryterium: Autor

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-87 z 87
    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:
    Determination of methane content at Maokhe coal mine from curent mining to -450 level in Vietnam
    Określenie zawartości metanu w wietnamskiej kopalni węgla Mao Khe do poziomu 450
    Autorzy:
    Nguyen, VanThinh
    Nguyen, CaoKhai
    Nguyen, VanQuang
    Tran, XuanHa
    Powiązania:
    https://bibliotekanauki.pl/articles/318056.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    methane
    coal mine
    Vietnam
    metan
    kopalnia węgla kamiennego
    Wietnam
    Opis:
    Methane gas is one of the most serious dangers of underground coal mining as its buildup can lead to methane gas explosion. In QuangNinh province- Vietnam, several coal mines such as TrangKhe II-III coal mine, Khe Cham coal mine, especially MaoKhe mine that have high methane content. At the MaoKhe coal mine,experimental data showed thatthe concentration of methane in coal seams at different depths were not similar.In order to ensure safety, this report has been undertaken to determine a pattern of changing methane contents of coal seams at different exploitation depths in MaoKhe underground coal mine.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 2/2; 2-7
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling labor productivity in high-rise building construction projects using neural networks
    Autorzy:
    Nguyen, Duc Anh
    Tran, Dung Quang
    Nguyen, Thoan Ngoc
    Tran, Hai Hong
    Powiązania:
    https://bibliotekanauki.pl/articles/2203438.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Labor productivity in building construction has long been a focused research topic due to the high contribution of labor cost in the building total costs. This study, among a few studies that used scaled data that were collected directly from measuring equipment and onsite activities, utilized neural networks to model the productivity of two main construction tasks and influencing factors. The neural networks show their ability to predict the behaviors of labor productivity of the formwork and rebar tasks in a test case of a high-rise building. A multilayer perceptron that had two layers and used sigmoid as its activation function provided the best effectiveness in predicting the relations among data. Among eleven independent factors, weather (e.g., temperature, precipitation, sun) generally played the most important role while crew factors were distributed in the mid of the ranking and the site factor (working floor height) played a mild role. This study confirms the robustness of neural networks in productivity research problems and the importance of working environments to labor productivity in building construction. Managerial implications, including careful environmental factors and crew structure deliberation, evolved from the study when labor productivity improvement is considered.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 1; 675--692
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Social capital and digital transformation of startups in Vietnam: the mediating role of access to resources
    Autorzy:
    Nguyen, Dat Hoang Anh
    Tran, Ghi Nha
    Tran, Khoa Dang
    Nguyen, Thach Ha
    Powiązania:
    https://bibliotekanauki.pl/articles/18029939.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    social capital
    access to resources
    digital transformation
    kapitał społeczny
    dostęp do zasobów
    transformacja cyfrowa
    Opis:
    The purpose of this study is to use social capital theory to explain how startups in Vietnam undergo the digital transformation process. The study investigates the connection between social capital, resource access, and digital transformation in Vietnamese startups. 230 managers were analyzed using the Partial Least Squares Structural Model (PLS-SEM). The study found a positive correlation between social capital, resource access, and digital transformation. Additionally, the study looked at the role of resource access as a mediator between social capital and digital transformation. The findings of this study hold immense importance for managers seeking to establish social capital with stakeholders, including government agencies, customers, competitors, and suppliers in the digital platform services industry. Leveraging social capital can increase managers’ access to crucial resources, especially during the Covid-19 pandemic. The study acknowledges its limitations and identifies areas for future research.
    Źródło:
    Management; 2023, 27, 1; 1d84--200
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    General Geometric Model of GNSS Position Time Series for Crustal Deformation Studies – A Case Study of CORS Stations in Vietnam
    Autorzy:
    Tran, Dinh Trong
    Nguyen, Quoc Long
    Nguyen, Dinh Huy
    Powiązania:
    https://bibliotekanauki.pl/articles/2019404.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    geometric model
    GNSS position time series
    crustal deformation
    CORS stations
    Vietnam
    model geometryczny
    GNSS
    Wietnam
    Opis:
    In processing of position time series of crustal deformation monitoring stations by continuous GNSS station, it is very important to determine the motion model to accurately determine the displacement velocity and other movements in the time series. This paper proposes (1) the general geometric model for analyzing GNSS position time series, including common phenomena such as linear trend, seasonal term, jumps, and post-seismic deformation; and (2) the approach for directly estimating time decay of postseismic deformations from GNSS position time series, which normally is determined based on seismic models or the physical process seismicity, etc. This model and approach are tested by synthetic position time series, of which the calculation results show that the estimated parameters are equal to the given parameters. In addition they were also used to process the real data which is GNSS position time series of 4 CORS stations in Vietnam, then the estimated velocity of these stations: DANA (n, e, u = -9.5, 31.5, 1.5 mm/year), HCMC (n, e, u = -9.5, 26.2, 1.9 mm/year), NADI (n, e, u = -10.6, 31.5, -13.4 mm/year), and NAVI (n, e, u = -13.9, 32.8, -1.1 mm/year) is similar to previous studies.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 183--197
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sharing and connecting information in the context of the Covid-19 pandemic and training skills for employees to meet the needs of businesses in digital transformation
    Autorzy:
    Hang, Nguyen Thi
    Tran, Trong Quyen
    Powiązania:
    https://bibliotekanauki.pl/articles/2174423.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    digital economy
    digital education
    digital transactions
    high-quality human resources
    digital enterprise
    Opis:
    In the context of the strong outbreak of the Covid-19 pandemic leading to increasing social distancing, it is difficult for businesses to access the labor market. Therefore, it is necessary to create a connection channel between the employer and the labor supplier. That helps to adapt to the context of the Covid-19 pandemic, while also taking advantage of the achievements from the Industrial Revolution 4.0. The development of a training model that connects human resource trainers with human resource users who are businesses is considered an important requirement in the context of the Covid-19 pandemic. The university-enterprise model demonstrates active cooperation and has a profound impact on teaching and scientific research activities in universities. Since then, constantly improving the quality of training to create labor products that meet the rigorous needs of enterprises. This study uses exploratory factor analysis methods to screen observations to analyze, evaluate and draw conclusions about the formation of a university-enterprise linkage model. Thereby helping to create a bridge in cooperation between universities and businesses. On that basis, propose solutions to promote cooperation between universities and businesses in the current Vietnamese conditions, contributing to creating high-quality labor for society, meeting the needs of digital businesses.
    Źródło:
    Management; 2022, 26, 1; 93--117
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The extensive 1-median problem with radius on networks
    Autorzy:
    Nhan, Tran Hoai Ngoc
    Hung, Nguyen Thanh
    Nguyen, Kien Trung
    Powiązania:
    https://bibliotekanauki.pl/articles/29519649.pdf
    Data publikacji:
    2024
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    extensive facility
    median problem
    tree
    convex
    Opis:
    The median location problem concerns finding locations of one or several new facilities that minimize the overall weighted distances from the existing to the new facilities. We address the problem of locating one new facility with a radius r on networks. Furthermore, the radius r is flexible and the objective function is the conic combination of the traditional 1-median function and the value r. We call this problem an extensive 1-median problem with radius on networks. To solve the problem, we first induce the so-called finite dominating set, that contains all points on the underlying network and radius values which are candidate for the optimal solution of the problem. This helps to develop a combinatorial algorithm that solves the problem on a general network G = (V,E) in O(|E||V|3) time. We also consider the underlying problem with improved algorithm on trees. Based the convexity of the objective function with variable radius, we develop a linear time algorithm to find an extensive 1-median with radius on the underlying tree.
    Źródło:
    Opuscula Mathematica; 2024, 44, 1; 135-149
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Social capital and digital transformation of startups in Vietnam during the COVID-19 pandemic: the mediating role of human capital and access to resources
    Autorzy:
    Nguyen, Thi Thuy Quynh
    Ghi, Tran Nha
    Nguyen, Tan Trung
    Powiązania:
    https://bibliotekanauki.pl/articles/27315592.pdf
    Data publikacji:
    2023
    Wydawca:
    STE GROUP
    Tematy:
    access to resources
    digital transformation
    human capital
    social capital
    Opis:
    Based on social network theory, the study explained the digital transformation process of startups in Vietnam during the outbreak of the COVID-19 pandemic. The study examined the relationship between social capital, human capital, access to resources, and digital transformation of startups in Vietnam. The study used Partial Least Squares - Structural Equation Modelling (PLS-SEM) with a sample size of 230 startups managers. The results show that there are positive and statistically significant relationships between social capital, human capital, access to resources, and digital transformation. The results also reveal the partial mediating roles of access to resources and human capital in the relationship between social capital and digital transformation. The results proposed some managerial implications for startups managers in building relationship networks with stakeholders such as government agencies and business partners (customers, competitors, suppliers, and providers of digital platform services). Through managers' social capital, accessible resources and the improvement of human capital have accelerated digital transformation for startups to escape the crisis of the COVID-19 pandemic. Finally, the study presented some limitations and directions for further research.
    Źródło:
    Management Systems in Production Engineering; 2023, 1 (31); 33--42
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variation in the Lipid Profile of Pacific Oyster (Crassostrea gigas) Cultured in Khanh Hoa Coast, Vietnam, Based on Location and Harvest Period
    Autorzy:
    Nguyen, Minh V.
    Kakooza, Derrick
    Tran, Anh P.
    Tran, Vy T.
    Powiązania:
    https://bibliotekanauki.pl/articles/28408446.pdf
    Data publikacji:
    2024-01-26
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    fatty acids
    farming location
    harvest season
    lipid profile
    phospholipids
    thrombogenicity index
    Opis:
    The lipid profiles of the oyster Crassostrea gigas cultured in Khanh Hoa coast at three locations and harvested in different months throughout the year were compared. Seasonal and locational changes in total lipid (TL) content, phospholipid content, free fatty acid content, fatty acid (FA) composition, and thrombogenicity index were found. The total lipid content and n-3/n-6 ratio in oysters from Ninh Hoa were higher compared to those from Cam Lam and Van Ninh. For oyster from all three farming areas, the total lipid content was the lowest during the two spawning seasons (May and September). Lipids from C. gigas were separated into neutral and polar lipid fractions using silica gel column chromatography. The amount of neutral lipids recovered from the oyster muscle was significantly higher than that of the polar lipids. The FA composition showed that C. gigas was abundant in saturated fatty acids (30.89–39.16 g/100 g TL), followed by polyunsaturated fatty acids (28.13–35.88 g/100 g TL), and monounsaturated fatty acids (19.32–23.75 g/100 g TL). The dominant polyunsaturated fatty acids of oysters from the three farming areas were eicosapentaenoic acid (9.09–13.77 g/100 g TL) and docosahexaenoic acid (6.71–16.47 g/100 g TL). Based on the present findings, it can be concluded that the Pacific oyster C. gigas cultured in Khanh Hoa, Vietnam is a promising source of highly nutritious exploitable lipids.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2024, 74, 1; 16-25
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of related parties’ trading on the listed company’s earnings management - evidence in Vietnam
    Autorzy:
    Hong, Nguyen Thi Phuong
    Loi, Tran Van
    Powiązania:
    https://bibliotekanauki.pl/articles/1818335.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    listed company
    earnings management
    related parties trading
    modified Jones model
    spółki giełdowe
    zarządzanie zyskami
    partner handlowy
    model Jonesa
    Opis:
    This study considers the impact of related parties’ trading (RPTs) on the listed company’s earnings management level (EM) in Vietnam’s securities market, of which EM is measured according to the modified Jones model by Dechow and Associates (1995). Through using 5 more control variables as public. How auditing firm, firm size, financial leverage, revenue growth and operating cash flow affect EM, The research results show that RPTs impact the same dimension on EM level. The study provides empirical evidence of the impact of RPTs on the EM level of companies listed on Vietnam’s securities market. Among its results to science is that it indicated with evidence, the higher the RPTs are, the greater its EM level becomes. We also identify practical contributions and limitations shown in the conclusion section.
    Źródło:
    Management; 2020, 24, 2; 181-208
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Risk management under impacts of macro economic factors in a big seafood Ex-Import Firm - AnGiang Fisheries Ex-Import jsc. in Vietnam
    Autorzy:
    Thach, Nguyen Ngoc
    Huy, Dinh Tran Ngoc
    Powiązania:
    https://bibliotekanauki.pl/articles/2064454.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    risk management
    macroeconomic factors
    Vietnam
    AGF stock price
    GDP growth
    inflationary
    risk free rate
    market interest rate
    zarządzanie ryzykiem
    czynniki makroekonomiczne
    Wietnam
    akcje AGF
    wzrost PKB
    inflacja
    rynkowa stopa procentowa
    Opis:
    AnGiang Fisheries Ex-Import Joint Stock Company (AGF) was established in 2001. Agifish has traditionally been a leader in the fields of production and business activities, scientific research in the field of fingerling production, seafood processing technology and the development of value added products processed from Basa-fish, Tra-fish. Agifish cares about building a spirit of solidarity between leaders, managers and workers striving for the development of the Company. Because we figure out there isa research gap in which many previous studies forgot to explore both internal and external macroeconomic elements and their impacts on stock price of Agifish (AGF), a big Vietnam fisheries firm, in the context Viet Nam and the US economies receive impacts from global economic crisis. With the using of quantitative analysis and statistics, regression OLS, together with qualitative methods including synthesis, comparison and explanatory methods, authors recognize that, in a six factor model, AGF stock price goes up together with effects from increase in GDP growth and lending rate declines. Last but not least, our research model can be expanded to other markets.
    Źródło:
    Management; 2021, 25, 1; 172--185
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Abstraction layer for development and deployment of cloud services
    Autorzy:
    Nguyen Minh, B.
    Tran, V.
    Hluchy, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/305457.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    cloud computing
    abstraction
    service development
    service deployment
    interoperability
    Opis:
    In this paper, we will present an abstraction layer for cloud computing, which intends to simplify the manipulation with virtual machines in clouds for easy and controlled development and deployment of cloud services. It also ensures interoperability between different cloud infrastructures and allows developers to create cloud appliances easily via inheritance mechanisms.
    Źródło:
    Computer Science; 2012, 13 (3); 79-88
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Land Subsidence Detection in Tan My-Thuong Tan Open Pit Mine and Surrounding Areas by Time Series of Sentinel-1 Images
    Wykrywanie osiadania powierzchni terenu górniczego w kopalni odkrywkowej Tan My-Thuong Tan i okolicach na podstawie wieloczasowych satelitarnych obrazów Sentinel-1
    Autorzy:
    Tran, Van Anh
    Bui, Xuan‑Nam
    Nguyen, Quoc Long
    Tran, Tuan-Anh
    Powiązania:
    https://bibliotekanauki.pl/articles/319075.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    open-pit mines
    PSInSAR
    land subsidence
    Sentinel-1
    Tan My-Thuong Tan
    kopalnia odkrywkowa
    osiadanie terenu
    kamieniołom Tan My-Thuong Tan
    Opis:
    Open-pit or underground mining both causes environmental impacts such as air, soil, water pollution, etc., especially causing land subsidence of mines and surrounding areas. Research on mining subsidence is often carried out by field survey, the advantage of this method is high accuracy, but it is usually applied in a small scale. Recently, with the development of radar technology, there have been many studies applying this Radar Interferometry technique to determine surface subsidence over a wide range with a few millimeters accuracy. In this paper, 24 Sentinel-1 images were used as input materials, using the Permanent Scatter Interferometry (PSInSAR) method to determine the land subsidence of the Tan My-Thuong Tan quarries and surrounding areas. The results were compared with the average annual subsidence of 20 surveying points using GNSS technology from 1/2018 to 3/2020. The correlation coefficient of annual average land subsidence of the two methods is 0.83, showing the feasibility of applying InSAR Sentinel-1 data processed by PSInSAR method for determining mine surface deformation and surrounding area.
    Zarówno górnictwo odkrywkowe, jak i podziemne powodują osiadanie powierzchni terenu górniczego i na otaczających obszarach. Badania osiadań górniczych są często prowadzone metodą monitorowania punktów stabilizowanych na liniach obserwacyjnych. Zaletą tej metody jest duża dokładność, ale najczęściej stosowana jest na niewielkim obszarze. Satelitarna interferometria radarowa InSAR jest teledetekcyjną techniką służącą do pozyskiwania danych osiadań powierzchni terenu w określonym przedziale czasu. Odpowiednie opracowanie dwóch radarogramów pozwala na uzyskanie izolinii okresowych niecek obniżeniowych na dużym obszarze. W artykule, przedstawiono wyniki zastosowania 24 obrazów satelitarnych Sentinel-1 wykorzystując metodę Permanent Scatter Interferometry (PSInSAR) do określenia osiadań powierzchni terenu górniczego kamieniołomu Tan My-Thuong Tan i okolic. Wyniki porównano ze średnimi rocznymi osiadaniami 20 punktów pomiarowych wykorzystujących technologię GNSS od 1/2018 do 3/2020. Współczynnik korelacji średnich rocznych osiadań gruntów obu metod wynosi 0,83, co wskazuje na możliwość wykorzystania danych InSAR Sentinel-1 przetworzonych metodą PSInSAR do wyznaczenia osiadań powierzchni terenu kopalni i otaczającego ją obszaru.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 171-180
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research and Development of Real-time High-precision GNSS Receivers: A Feasible Application for Surveying and Mapping in Vietnam
    Autorzy:
    Pham, Cong Khai
    Nguyen, Gia Trong
    Nguyen, Van Hai
    Tran, Trong Xuan
    Powiązania:
    https://bibliotekanauki.pl/articles/2020209.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    GNSS/CORS
    low-cost high-precision
    GNSS receivers
    real-time high-precision GNSS receivers
    NTRIP
    BD970 Trimble
    ZED-F9P
    GNSS
    geodezja
    Wietnam
    Opis:
    In recent years, the Global Navigation Satellite System (GNSS) has been widely applied in surveying and mapping. Currently, in Vietnam, dual-frequency GNSS receivers are quite extensively applied with the real-time kinematic (RTK) measurement technique using a continuously operating reference station network. However, high-accuracy GNSS receivers are often expensive, sometimes not meeting the needs of users for specific applications. This research develops two types of low-cost highprecision GNSS receivers for RTK positioning for different purposes. First, the millimeter precision GNSS receiver used in real-time displacement monitoring is based on Trimble's BD970 mainboard technology and some other modules. These components are interconnected according to a standard design scheme and assembled in an enclosure to form a GNSS receiver. In addition, a GNSS data transmission in the National Marine Electronics Association standard format by Networked Transport of Radio Technical Commission for Maritime Services via Internet Protocol (NTRIP) has been designed and developed. The GNSS receiver after development is loaded with program code written in the C# programming language, using the Arduino programming tool. Second, the GNSS receivers have the centimeter accuracy for RTK positioning used in surveying and mapping based on U-blox's mainboard technology and some other modules. These modules are also connected together according to a standard design scheme and assembled in an enclosure to form a complete GNSS receiver. The evaluation results show that the designed and developed GNSS receivers completely meet the requirements of surveying and mapping in coal mines in Vietnam, such as real-time monitoring of landslides, surveying and topographical mapping and other surveying works to serve the mining process.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 391--404
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developing the Regression Equations to Determine the Bankfull Discharge from the Basin Characteristics
    Autorzy:
    Chau, Tran Kim
    Toan, Nguyen The
    Duc, Do Anh
    Linh, Nguyen Ha
    Powiązania:
    https://bibliotekanauki.pl/articles/2097760.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    bankfull discharge
    regression equation
    catchment characteristics
    Opis:
    Bankfull discharge is an important criterion for flash flood warnings. In this study, the authors propose a new approach to determine the bankfull discharge for basins in Ha Giang province, Vietnam. The study combines the field survey to determine the bankfull discharge through the bankfull indicators and develop a multivariate regression equation between the bankfull discharge and the basin characteristics. The results of the study give a simple equation with 2 independent variables. They are the catchment area and the main river length. They show a strong relationship with the bankfull discharge with the R2 indexes in developing and validating process equal to 95.3% and 92.7%, respectively. With this approach, the workload is significantly reduced. However, the accuracy and flexibility of the total discharge calculation are enhanced. This will be the foundation to reduce uncertainty in flash flood warnings.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2021, 68, 2; 103--117
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of the hydraulic jump length in a smooth trapezoidal channel
    Autorzy:
    Ngoc, Nguyen Minh
    Cuong, Pham Hong
    Son, Tran Thanh
    Nam, Nguyen Van
    Phong, Nguyen Thanh
    Powiązania:
    https://bibliotekanauki.pl/articles/35547843.pdf
    Data publikacji:
    2022
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    jump lenght
    roller length
    hydraulic jump
    trapezoidal channel
    spillway
    Opis:
    The article showed the result of investigation of the length of hydraulic jump in trapezoidal channel. In this study, the basic factors that affect the length (Lj) and roller length (Lr) of hydraulic jump were investigated by physical trapezoidal channel’s model. The experiment carried out in purpose to establish a new empirical equation for calculating the roller length (Lr) of the jump in the horizontal trapezoidal channel with the upstream flow Froude number 4.0 to 9.0 (the steady jump). The hydraulic characteristics of forced jump were measured and statistically calculated by excel software. The results of data analysis showed that the MAPE was relatively small (< 5%), and R2 > 0.9 (strong correlation between predicted and observed values) and other statistical indicators are less than 0.1 (MSE = 0.004, RMSE = 0.062 và MEA = 0.047). Therefore, the equation found could be appropriated and applied to calculate characteristics of hydraulic jump trapezoidal channel.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2022, 31, 1; 63-76
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of Automatic Firing System Type Gas-Operated Weapon
    Autorzy:
    Nguyen, Phon D.
    Vo, Bien Van
    Nguyen, Phu M.
    Tran, Thanh H.
    Powiązania:
    https://bibliotekanauki.pl/articles/27314927.pdf
    Data publikacji:
    2023
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    automatic firing system
    PKMS machine gun
    gas operated weapon
    Opis:
    The paper presents a new approach to establish a mathematical model of an automatic firing system of gas-operated weapons, which is based on the Lagrange's theory. In contrast to previous studies, a dynamic model is supplemented with dynamic link between a basic mechanism and a receiver assembly with longitudinal clearance without taking into account horizontal clearance. The automatic firing system of the PKMS machine gun has been selected for calculation of a theoretical model and a verification test. Through comparison between theoretical and experimental results, the mathematical model is proven to be accurate and reliable. The results obtained from the paper are the basis for evaluating the automatic firing system ability to work. This is also a reliable source of reference for designers in the process of optimising the structure of the automatic firing system.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2023, 14, 4 (54); 9--22
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Static behaviour of functionally graded plates resting on elastic foundations using neutral surface concept
    Autorzy:
    Van-Loi, Nguyen
    Minh-Tu, Tran
    Van-Long, Nguyen
    Quang-Huy, Le
    Powiązania:
    https://bibliotekanauki.pl/articles/1845053.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    static analysis
    functionally graded plate
    Winkler-Pasternak foundation
    physical neutral surface
    four-variable refined theory
    analiza statyczna
    podłoże typu Winkler-Pasternak
    fizycznie neutralna powierzchnia
    Opis:
    In this study, static behaviors of functionally graded plates resting on Winkler-Pasternak elastic foundation using the four-variable refined theory and the physical neutral surface concept is reported. The four-variable refined theory assumes that the transverse shear strain has a parabolic distribution across the plate’s thickness, thus, there is no need to use the shear correction factor. The material properties of the plate vary continuously and smoothly according to the thickness direction by a power-law distribution. The geometrical middle surface of the functionally graded plate selected in computations is very popular in the existing literature. By contrast, in this study, the physical neutral surface of the plate is used. Based on the four-variable refined plate theory and the principle of virtual work, the governing equations of the plate are derived. Next, an analytical solution for the functionally graded plate resting on the Winkler-Pasternak elastic foundation is solved using the Navier’s procedure. In numerical investigations, a comparison of the static behaviors of the functionally graded plate between several models of displacement field using the physical neutral surface is given, and parametric studies are also presented.
    Źródło:
    Archive of Mechanical Engineering; 2021, LVIII, 1; 5-22
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Human capital, digital transformation, and firm performance of startups in Vietnam
    Autorzy:
    Ghi, Tran Nha
    Thu, Nguyen Quang
    Huan, Ngo Quang
    Trung, Nguyen Tan
    Powiązania:
    https://bibliotekanauki.pl/articles/2105388.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    human capital
    digital transformation
    firm performance
    kapitał Ludzki
    transformacja cyfrowa
    wydajność firm
    Opis:
    Based on social capital theory, the study explained the digital transformation process of startups in Vietnam. The primary object of this study is to examine the relationship between human capital, digital transformation, and firm performance of startups in Vietnam. The study applied Partial Least Squares Structural Model (PLS-SEM) with a sample size of 230 managers. The results demonstrated the positive relationships between human capital, digital transformation, and firm performance. The study explored digital transformation as a mediation mechanism between human capital and firm performance. The results provided some managerial implications for managers to focus on improving human capital in order to promote digital transformation and firm performance. This is an important strategy to help startups escape the crisis of Covid-19 pandemic. Finally, the study presented some limitations and directions for further research.
    Źródło:
    Management; 2022, 26, 1; 1--18
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of effect of trim on performance of 12500DWT cargo ship using RANSE method
    Autorzy:
    Chuan, Tran Quoc
    Phuong, Nguyen Kim
    Tu, Tran Ngoc
    Quan, Mai Van
    Anh, Nguyen Duy
    Le, Tat-Hien
    Powiązania:
    https://bibliotekanauki.pl/articles/32891489.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    RANSE
    ship performance
    trim optimisation
    operating condition
    ship speed
    Opis:
    This paper deals with the results of studying the effect of trim on the performance of series cargo ship 12500DWT in full scale at two operating conditions by using the RANSE method. The Body Force Propeller method is used to simulate a rotating propeller behind the ship. The numerical predicted results at the ballast condition were verified and validated with sea trial data. The ship’s engine power curves for different trim conditions at two operating conditions were carried out to produce a data source to evaluate the effect of trim on the performance of the 12500DWT cargo ship. The results indicate that if the ship operates under optimum trim conditions, this can decrease the ship’s engine power in a range from 2.5 to 4.5% depending on different loading conditions and ship speeds. Finally, the paper also provides detailed differences in flow around the ship due to trim variation to explain the physical phenomenon of changing ship performance.
    Źródło:
    Polish Maritime Research; 2022, 1; 3-12
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatty Acid Composition and Anticancer Activity of Neutral and Polar Lipids of Pacific Oyster (Crassostrea gigas) Cultured in Khanh Hoa Coast in Vietnam
    Autorzy:
    Nguyen, Minh V.
    Kakooza, Derrick
    Do, Thi Hong Tuoi
    Tran, Anh P.
    Nguyen, Han T.
    Tran, Ngoc Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/31341116.pdf
    Data publikacji:
    2024-05-24
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    anticancer activity
    fatty acid profile
    lipid fraction
    n3/n6 ratio
    thrombogenicity
    Opis:
    In this study, we investigated the fatty acid composition and anticancer activity of neutral and polar lipid fractions extracted from Crassostrea gigas oysters cultured in Nha Phu Lagoon, Khanh Hoa Coast, harvested during the five months of January, April, May, September, and November. Analysis revealed that saturated fatty acids (SFAs) were the most abundant fatty acids in the neutral lipid fraction, followed by monounsaturated fatty acids (MUFAs) and polyunsaturated fatty acids (PUFAs). Conversely, the polar lipid fraction exhibited a different order, with PUFAs being the most abundant, followed by MUFAs and SFAs. Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) were identified as the most prevalent polyunsaturated fatty acids, while oleic acid and palmitic acid were the predominant monounsaturated and saturated fatty acids, respectively. Notably, the combined content of EPA and DHA in the polar lipid fraction consistently exceeded 30% throughout all five months of analysis. Thrombogenicity index (TI) values ranged from 0.13 to 0.29 for the polar lipid fraction and from 0.6 to 1.1 for the neutral lipid fraction. Moreover, the polar lipid fraction exhibited significantly higher n3/n6 ratios compared to the neutral lipid fraction. The polar lipid fraction exhibited stronger inhibitory effects on the growth of the three cancer cell lines (HepG2, MDA-MB-231, and RD) compared to the neutral lipid fraction. The findings of the present study show that lipids extracted from C. gigas oysters cultured in Khanh Hoa Coast have a weak anticancer activity but may still aid in prevention and treatment of certain cancer types.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2024, 74, 2; 169-176
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    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:
    Sustainable business solutions for traditional handicraft product in the Northwestern provinces of Vietnam
    Autorzy:
    Hai, Nguyen Thuy
    Duong, Nguyen Thuy
    Huy, Dinh Tran Ngoc
    Hien, Dinh Thi
    Powiązania:
    https://bibliotekanauki.pl/articles/1818191.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    traditional handicraft products
    business development
    tourism
    sustainable development
    Vietnam
    North-Western Provinces
    tradycyjne wyroby rękodzielnicze
    rozwój biznesu
    turystyka
    rozwój zrównoważony
    Wietnam
    prowincje północno-zachodnie
    Opis:
    Local tourism development requires us to consider many solutions, among them is sustainable solutions for business development of traditional handicraft products. This study is done based on surveys of northwestern provinces of Vietnam, in which authors use statistics, questionnaires and charts. Research findings show us that despite of potential chances, tourism activities still mainly exploit the value of available natural resources, are heavily spontaneous, lack of planning, small-scale tourism business, lack of creativity and diversity in tourism activities. services, infrastructure and quality of tourism service are limited. Our study also indicated that macro factors affect tourism activities.
    Źródło:
    Management; 2021, 25, 1; 209-233
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancing emotional engagement through relational contracts, management receptiveness, and employee commitment as a stimulus for job satisfaction and job performance in the public sector
    Autorzy:
    Nguyen, Phuong V.
    Nguyen, Loi Tan
    Doan, Khanh Ngoc Van
    Tran, Hoa Quynh
    Powiązania:
    https://bibliotekanauki.pl/articles/22444351.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    emotional engagement
    job satisfaction and performance
    relational contract
    management receptiveness
    employee communication
    PLS-SEM
    public sector
    Opis:
    Research background: In the private sector and on social media, corporate emotional interaction has lately become a hot topic. In the background of the public sector, however, it has scarcely been discussed and very little is known about its determinants and implications. Purpose of the article: This research investigates the role of organizational emotional engagement through relational contracts, senior management receptivity, and upward communication of employees in the public sector in stimulating work satisfaction and job efficiency. Methods: This research was based on data collected between April 1, 2020, and May 31, 2020, from 335 state employees from various governmental organizations in Ho Chi Minh City (HCMC), Vietnam. To evaluate the hypothesized model, partial least squares-structural equation modeling was used. Findings & value added: Our results illustrate that relational contracts have a powerful effect on emotional engagement. Positive relationships were confirmed between employee engagement and the voice of employees and between employee engagement and job performance. Moreover, the findings also support the role of senior management receptiveness in stimulating organizational emotional engagement. This study addresses questions about absence of academic studies on organizational emotional engagement in the public sector. The results highlight the important role of emotional engagement in stimulating job satisfaction and job performance through relational contracts, senior management receptiveness, and upward employee communication.
    Źródło:
    Equilibrium. Quarterly Journal of Economics and Economic Policy; 2021, 16, 1; 203-224
    1689-765X
    2353-3293
    Pojawia się w:
    Equilibrium. Quarterly Journal of Economics and Economic Policy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical prediction of propeller-hull interaction characteristics using RANS method
    Autorzy:
    Tu, Tran Ngoc
    Luu, Do Duc
    Ha, Nguyen Thi Hai
    Quynh, Nguyen Thi Thu
    Vu, Nguyen Minh
    Powiązania:
    https://bibliotekanauki.pl/articles/258472.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    propeller
    interaction
    hull
    wake fraction
    thrust deduction
    relative rotative efficiency
    RANS equations
    Opis:
    The paper presents the results of computational evaluation of the hull-propeller interaction coefficients, also referred to propulsive coefficients, based on the unsteady RANS flow model. To obtain the propulsive coefficients, the ship resistance, the open-water characteristics of the propeller, and the flow past the hull with working propeller were computed. For numerical evaluation of propeller open-water characteristics, the rotating reference frame approach was used, while for self-propulsion simulation, the rigid body motion method was applied. The rotating propeller was modelled with the sliding mesh technique. The dynamic sinkage and trim of the vessel were considered. The free surface effects were included by employing the volume of fluid method (VOF) for multi-phase flows. The self-propulsion point was obtained by performing two runs at constant speed with different revolutions. The well-known Japan Bulk Carrier (JBC) test cases were used to verify and validate the accuracy of the case studies. The solver used in the study was the commercial package Star-CCM+ from SIEMENS.
    Źródło:
    Polish Maritime Research; 2019, 2; 163-172
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A model of Lean Management for organizational innovation: cases in visegrád and AFTA
    Autorzy:
    Tran, Tuan-Anh
    Ghabour, Rajab
    Nguyen, My
    Daróczi, Miklós
    Powiązania:
    https://bibliotekanauki.pl/articles/88557.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    Lean management
    organizational innovation
    knowledge transfer
    V4
    AFTA
    lean management
    innowacje organizacyjne
    transfer wiedzy
    Opis:
    Originated as a production management philosophy, Lean Manufacturing has successfully transferred and implemented globally. Lean genealogy studies have been conducted, indicating the essential concept now evolves to Lean Management (LM), which is applicable to many branches of production and services management, viz quality and productivity, human resources, knowledge and technology, etc. Innovation has been made to ensure a smooth customization of knowledge and principles, tailored to each organization who is eager to implement this state-of-the-art management system. However, failures are becoming commonplace due to the lack of understanding the core values, and insufficient intensification of compensation for cultural differences. In this paper, cases of implementing LM across the Visegrád group (V4) and the ASEAN Free Trade Area (AFTA) from previous literature are taken into consideration. Factors that differentiate the characteristic of LM are brought to discussion. Therefore, the discovered gap between the two trade blocs urges the in-depth amendment and modification of employed concepts, tools, etc. A model is consequently elaborated, which aims at facilitate the managerial decision-making process regarding knowledge transfer of LM between V4 and AFTA, based on critical factors related to human, technology and culture, i.e. Labor cost, Manual requirement, Awareness, Continuous Improvement culture. This model can be used to predict the change should be made, or the criterion should be fulfilled to transfer the implementation and knowledge of LM effectively.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 532-541
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the possibility of using artificial pillar to replace the protection coal pillar of the preparation roadways during the mining process at underground coal mines in Quang Ninh region, Vietnam
    Badanie możliwości zastosowania sztucznego filaru do zastąpienia ochronnego filaru węglowego na drogach przygotowawczych podczas procesu wydobycia w podziemnych kopalniach węgla w regionie Quang Ninh w Wietnamie
    Autorzy:
    Cuong, Dinh Van
    Thanh, Tran Van
    Tuan, Nguyen Anh
    Powiązania:
    https://bibliotekanauki.pl/articles/318747.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    podziemne kopalnie węgla
    Wietnam
    filary
    underground coal mines
    Vietnam
    pillars
    Opis:
    The coal reserves in protection pillar of roadways are expected to be left in the mining process in underground mines in Quangninh coal basin which is relatively large (about 16% of the total reserves). If it can be exploited, it will help to save non-renewable coal resources, reduce the cost of preparing roadway meters, extend the mine life and increase the efficiency of construction investment. In the world, in order to reduce coal loss in protection pillar of roadways, mining technology to exploit and use artificial protection pillars are quite popular. Accordingly, in order to simultaneously exploit coal in the protection pillar and maintain the transport roadway as a ventilation roadway for the longwall in below level, the post-mining coal pillar will be replaced by artificial pillars formed from the stone backfill cribs, columns, metal cribs, chemical materials or low-grade concrete mortar mixes formed from fly ash, bottom ash of thermal power plants, combined crushed waste rock and a cement additive,... This paper will evaluate the possibility and propose a number of mining technological scheme as well as the type of construction materials suitable for artificial columns.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 2/2; 192-198
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    GNSS/CORS-Based Technology for Real-Time Monitoring of Landslides on Waste Dump – A Case Study at the Deo Nai South Dump, Vietnam
    Monitorowanie osuwisk na zwałowiskach w czasie rzeczywistym w oparciu o technologię GNSS/CORS -studium przypadku na zwałowisku Deo Nai Południa, Vietnam
    Autorzy:
    Pham, Cong Khai
    Tran, Dinh Trong
    Nguyen, Van Hai
    Powiązania:
    https://bibliotekanauki.pl/articles/319221.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    GNSS CORS technology
    continuously monitoring station system
    landslide monitoring in real time
    deo nai south waste dump
    technologia GNSS CORS
    System Stacji Ciągłego Monitorowania
    monitorowanie osuwisk w czasie rzeczywistym
    wysypisko śmieci w Deo Nai South
    Opis:
    Nowadays, there are many different methods for monitoring waste dump landslides based on GPS, total station, remote sensing, UAV, Lidar, etc. However, these technologies can only periodically monitor but cannot continuously monitor in real time. In recent years, GNSS CORS technology has been applied to continuously monitor real time waste dump landslides in open-pit mines to provide immediate or nearly-instant warning of waste dump landslides, which can timely prevent and minimize damages to property and human life. In the present work, the real time monitoring system of waste dump landslides monitoring based on GNSS CORS technology was designed and built. This real time monitoring system includes (1) the GNSS CORS station based on Leica technology, (2) the monitoring stations system, (3) the data collection, transmission and processing system based on Trimble technology and the warning system. This system allows continuous monitoring in real time and provides an instant warning if the landslide occurred. Moreover, it also has the advantage of being cheap, flexible and easy to install for monitoring stations. A simulation experiment results showed that our monitoring system operates stably and continuously 24/7 with a horizontal accuracy of ±3 mm and vertical accuracy of ±5 mm.
    Częste występujące ulewy mają katastrofalne skutki powodując osuwanie mas skalnych na zwałowisku. W wyniku tego następuje zniszczenie, zasypanie urządzeń, dróg dojazdowych itp. Obecnie istnieje wiele różnych metod monitorowania osuwisk na zwałowiskach w oparciu o GPS, tachimetr, teledetekcję, UAV, Lidar itp. Jednak technologie te mogą monitorować tylko okresowo, nie mogą monitorować w sposób ciągły w czasie rzeczywistym. W ostatnich latach, technologia GNSS CORS była stosowana do ciągłego monitorowania w czasie rzeczywistym osuwisk na zwałowiskach w kopalniach odkrywkowych, aby zapewnić ostrzeżenie natychmiastowe lub prawie natychmiastowe o osuwiskach, co może na czas zapobiec i zminimalizować szkody mienia i życia ludzi. W artykule, przedstawiono system monitoringu osuwisk w czasie rzeczywistym w oparciu o technologię GNSS/CORS. Ten system monitoringu w czasie rzeczywistym obejmuje (1) stację GNSS CORS opartą na technologii Leica, (2) system stacji monitorujących, (3) system zbierania, transmisji i przetwarzania danych oparty na technologii Trimble oraz system ostrzegawczy. System ten umożliwia ciągłe monitorowanie w czasie rzeczywistym i zapewnia natychmiastowe ostrzeżenie w przypadku wystąpienia osuwisk. Ponadto ma tę zaletę, że jest tani, elastyczny i łatwy w instalacji dla stacji monitorujących. Wyniki eksperymentu symulacyjnego wykazały, że nasz system monitorowania działa stabilnie i nieprzerwanie 24 godziny na dobę, 7 dni w tygodniu z dokładnością poziomą ± 3 mm i dokładnością pionową ± 5 mm.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 181-191
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Government Support and Firm Profitability in Vietnam
    Wsparcie rządowe a rentowność przedsiębiorstw w Wietnamie
    Autorzy:
    Nguyen, Thanh Minh
    Tran, Tuyen Quang
    Do, Long Thanh
    Powiązania:
    https://bibliotekanauki.pl/articles/633293.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    wsparcie rządowe
    rentowność
    metoda regresji kwantylowej
    MŚP
    government support
    profitability
    quantile approach
    SMEs
    Opis:
    Istniejące badania dotyczące związku między subwencjami rządowymi a wynikami finansowymi przedsiębiorstw często wykorzystują średnie podejście oparte na analizie regresji i koncentrują się głównie na krajach rozwiniętych. Aby wypełnić tę lukę, badanie to po raz pierwszy bierze pod uwagę wpływ działań wspierających rząd na opłacalność MŚP produkcyjnych w kraju rozwijającym się, jakim jest Wietnam. Wykorzystując niezbilansowany panel danych, obejmujący okres 2009–2015, wykazano, że rządowe wsparcie finansowe ma niewielki wpływ na rentowność jeśli zastosuje się zwykłą metodę najmniejszych kwadratów (OLS). Jednak metoda regresji kwantylowej z efektami stałymi pokazuje, że wsparcie finansowe ma negatywny wpływ na rentowność w przypadku firm o niskich zyskach, ale wpływa pozytywnie w przypadku firm o wysokim percentylu rentowności. Wyniki przeprowadzonych badań sugerują również, że decydenci powinni skupić się na wspieraniu start‑upów, a nie nieefektywnych firm niezarejestrowanych.
    Existing studies on the linkage between government subsidies and firm financial performance often use a mean regression approach and focus mainly on developed countries. To fill the gap, this study, for the first time, considers the impact of government support activities on the profitability of manufacturing SMEs in a developing country, Vietnam. Using an unbalanced panel dataset covering the period 2009–2015, government financial supports show an insignificant linkage with firm profitability when using OLS. However, a fixed‑effect quantile approach reveals that government financial support is negatively related for firms with low profit but is positively related for firms in the high profitability percentile. Our findings also suggest that policymakers should focus on helping start‑ups instead of ineffective, informal firms.
    Źródło:
    Comparative Economic Research. Central and Eastern Europe; 2018, 21, 4; 105-120
    1508-2008
    2082-6737
    Pojawia się w:
    Comparative Economic Research. Central and Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Responses of the Micro-Crustacean, Daphnia magna, across Five Generations Continuously Exposed to Di-2-Ethylhexyl Phthalate in Mekong River Water
    Reakcje mikroskorupiaków, Daphnia magna, w ciągu pięciu pokoleń stale narażonych na działanie ftalanu di-2-etyloheksylu w wodzie rzeki Mekong
    Autorzy:
    Tran, Vinh-Quang
    Nguyen, Van-Tai
    Dao, Thanh-Son
    Powiązania:
    https://bibliotekanauki.pl/articles/2175329.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    chronic effects
    Daphnia magna
    energy cost
    life traits
    plastic additives
    skutki chroniczne
    zużycie energii
    cechy życiowe
    dodatki do tworzyw sztucznych
    Opis:
    Plastic pollution has been considered as an emerging environmental problem, and is among the ecological and human health concerns. Detrimental impacts of plastic pollution on living things are closely related to the plastic additives added onto the polymer during plastic manufacture. Di-2-ethylhexyl phthalate (DEHP) is one of the most common plasticizers and is usually found in water environment worldwide. Plastic additives can cause many negative effects on aquatic organisms such as fish and zooplankton. This study aimed to assess the chronic effects of DEHP on the life history traits of an ecotoxicological model micro-crustacean, Daphnia magna, across five generations (F0–F4). We used the natural water from Mekong River in Vietnam as the medium for the D. magna incubation in laboratory conditions. The concentrations of trace elements (e.g., metals and pesticides) in the natural water were under detection levels of equipment or very low which was sufficient for D. magna to grow well. The results showed that the body length was the main endpoint of the organisms inhibited by DEHP across all generations. DEHP adversely impacted the survival and fecundity of D. magna in the fourth generation (F3) only. The adverse effects of DEHP on body length of D. magna should be the consequence of the energy cost and allocation in the exposed organisms. The survival and reproduction responses of D. magna to DEHP across five generations could be explained by (i) the severe effects of the chemical on many individuals in the organism cohort, and (ii) toxin-tolerant development in the remaining exposed organisms. Although the trace elements in natural water from Mekong River were not toxic to D. magna at very low concentrations, together with DEHP they might enhance impacts on the organism. Besides, a multigenerational exposure to DEHP would reflect clearer impacts on the organism than a single exposure. Our results could be useful for extrapolation on the influence of plasticizers on freshwater zooplankton in nature.
    Zanieczyszczenie tworzywami sztucznymi zostało uznane za narastające zagrożenie środowiskowe i jest jednym z problemów ekologicznych związanych ze zdrowiem człowieka. Szkodliwy wpływ zanieczyszczenia tworzywami sztucznymi na organizmy żywe jest ściśle związany z dodatkami tworzyw sztucznych dodawanymi do polimeru podczas produkcji tworzyw sztucznych. Ftalan di2-etyloheksylu (DEHP) jest jednym z najpowszechniejszych plastyfikatorów i zwykle występuje w środowisku wodnym na całym świecie. Dodatki do tworzyw sztucznych mogą powodować wiele negatywnych skutków dla organizmów wodnych, takich jak ryby i zooplankton. Badania przedsatwione w artykule miały na celu ocenę ciągłego wpływu DEHP na cechy historii życia modelu ekotoksykologicznego mikroskorupiaka, Daphnia magna, w ciągu pięciu pokoleń (F0–F4). Jako pożywkę do inkubacji D. magna w warunkach laboratoryjnych wykorzystano naturalną wodę z rzeki Mekong w Wietnamie. Stężenia pierwiastków śladowych (np. metali i pestycydów) w naturalnej wodzie były poniżej poziomu wykrywalności sprzętu lub bardzo niskie, co było wystarczające, aby D. magna dobrze się rozwijała. Wyniki pokazały, że długość ciała była głównym punktem oceny rozwoju organizmów hamowanego przez DEHP we wszystkich pokoleniach. DEHP negatywnie wpłynął na przeżywalność i płodność D. magna jedynie w czwartym pokoleniu (F3). Negatywny wpływ DEHP na długość ciała D. magna powinien być konsekwencją zużycia energii i jej alokacji w narażonych organizmach. Reakcje D. magna na przetrwanie i reprodukcję pod wpływem DEHP w ciągu pięciu pokoleń można wytłumaczyć (i) poważnym wpływem substancji chemicznej na wiele osobników w populacji organizmów oraz (ii) rozwojem tolerancji na toksyny u pozostałych narażonych organizmów. Chociaż pierwiastki śladowe w naturalnej wodzie z Mekongu nie były toksyczne dla D. magna w bardzo niskich stężeniach, to razem z DEHP mogą nasilać oddziaływanie na organizm. Poza tym wielopokoleniowe narażenie na DEHP odzwierciedlałoby wyraźniejszy wpływ na organizm niż jednorazowe narażenie. Przedstawione wyniki mogą być przydatne do ekstrapolacji wpływu plastyfikatorów na zooplankton słodkowodny w przyrodzie.
    Źródło:
    Inżynieria Mineralna; 2022, 2; 77--83
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital Transformation in Mining Sector in Vietnam
    Transformacja cyfrowa w sektorze wydobywczym w Wietnamie
    Autorzy:
    Van Hau, Nguyen
    Khanh Ly, Chau Thi
    Quynh Nga, Nguyen
    Hong Duyen, Nguyen Thi
    Huong Hue, Tran Thi
    Powiązania:
    https://bibliotekanauki.pl/articles/2172085.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    digital transformation
    coal-mineral industry
    mechanization
    transformacja cyfrowa
    przemysł węglowo-mineralny
    mechanizacja
    Opis:
    Digital transformation is one of the inevitable trends in today’s world. Vietnam is one of the pioneer countries following this trend and has launched a national digital transformation program. Digital transformation has attracted great interest from both the community of scientists and managers in general and in the field of coal mining and other minerals. Currently, researchers have been focusing on issues, such as the theory of digital transformation in both state and the business sector, the relationships between digital transformation and the building of e-government or digital government, and between digital transformation and effective national administration. In this study, the method of document-based analysis (Desk review) was used to analyze and evaluate the current situation of digital transformation of the coal and mineral mining industry and identify achievements as well as limitations of the digital transformation process in the coal and mineral mining industry in Vietnam. The study presents the following issues: (1) Some general issues about digital transformation, in which the concept of digital transformation is clarified; Meaning of digital transformation in the field of coal and mineral mining; Requirements for digital transformation in the field of coal-mineral mining. (2) The current status of digital transformation in coal-mineral mining in Vietnam, including applying advanced technologies in exploration and mining, and application of advanced technologies in mining and environmental protection.
    Cyfrowa transformacja to jeden z nieuniknionych trendów w dzisiejszym świecie. Wietnam jest jednym z pionierskich krajów podążających za tym trendem i uruchomił krajowy program transformacji cyfrowej. Transformacja cyfrowa cieszy się dużym zainteresowaniem zarówno środowiska naukowców, jak i menedżerów w ogóle oraz w obszarze górnictwa węgla kamiennego i innych kopalin. Obecnie badacze koncentrują się na takich zagadnieniach, jak teoria transformacji cyfrowej zarówno w państwie, jak iw sektorze biznesowym, związki między transformacją cyfrową a budową e-government lub cyfrowego rządu oraz między transformacją cyfrową a efektywną administracją państwową. W niniejszym opracowaniu metoda analizy dokumentów (Desk review) została wykorzystana do analizy i oceny aktualnej sytuacji transformacji cyfrowej górnictwa węgla kamiennego i kopalin oraz identyfikacji osiągnięć i ograniczeń procesu transformacji cyfrowej w górnictwie węglowym i mineralnym. przemysł wydobywczy minerałów w Wietnamie. W opracowaniu przedstawiono następujące zagadnienia: (1) Niektóre ogólne zagadnienia dotyczące transformacji cyfrowej, w których doprecyzowano pojęcie transformacji cyfrowej; Znaczenie transformacji cyfrowej w obszarze górnictwa węglowego i mineralnego; Wymagania transformacji cyfrowej w obszarze górnictwa węglowo-mineralnego. (2) Aktualny stan transformacji cyfrowej w górnictwie węglowo-mineralnym w Wietnamie, w tym zastosowanie zaawansowanych technologii w eksploracji i wydobyciu oraz zastosowanie zaawansowanych technologii w górnictwie i ochronie środowiska
    Źródło:
    Inżynieria Mineralna; 2022, 2; 21--30
    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:
    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
    Tytuł:
    Developing Electronic Government Towards Digital Government to Enhance the Efficiency of State Governance in Vietnam
    Autorzy:
    Chu, Thi Khanh Ly
    Nguyen, Nga Quynh
    Nguyen, Hau Van
    Tran, Thi Huong Huc
    Powiązania:
    https://bibliotekanauki.pl/articles/27323237.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    electronic government
    digital government
    online public services
    e-urząd
    usługi publiczne
    cyfryzacja
    Opis:
    The development of an electronic government, aiming for a digital government to effectively manage the state and contribute to the convenience of citizens and businesses, is both a crucial aspect of the comprehensive administrative reform program for the period 2021-2030 and an essential global trend for all countries, including Vietnam. This article discusses various topics: general issues related to electronic government and digital government, the current situation of electronic government development in Vietnam, challenges faced in the process of developing electronic government towards a digital government in Vietnam, and some solutions to enhance the effectiveness of electronic government development towards a digital government in Vietnam.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 131--136
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of Pre Blasting (Pre-Splitting) in Tan Cang Quarry NO.1 in Vietnam
    Projekt techniki strzelniczej w kamieniołomie Nr 1 w Tan Cang nr 1 w Wietnamie
    Autorzy:
    Nguyen, Dinh An
    Pham, Thai Hop
    Le, Cong Dien
    Tran, Quang Hieu
    Tran, Dinh Bao
    Powiązania:
    https://bibliotekanauki.pl/articles/319101.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    pre-splitting
    limestone quarry
    blasting parameters
    techniki strzelnicze
    kamieniołom wapienia
    parametry wybuchu
    Opis:
    Nowadays, construction material quarries in Dong Nai Province are exploiting with large quarrying depth, and the annual output could reach to tens of million cubic meters. The blasting frequency could be reached to hundreds of times, so the frequency is the major reason decreasing the cohesion of rock mass. Therefore, the surrounding area of blasting holes is broken, especially the area next to the final border where bench slope angle is not implemented as that of design stage, as well as the back break, also causes fractures on the bench slope, resulting in instability and unsafety due to falling rock. In this paper, the author also wants to introduce the pre blasting and the method to define blasting parameters to increase the stabilization of Slopes in Tan Cang quarry NO.1 in Vietnam.
    Obecnie kamieniołom litych surowców skalnych w prowincji Dong Nai prowadzi eksploatację na dużej głębokości. Roczne wydobycie materiałów budowlanych dochodzi do kilkudziesięciu milionów metrów sześciennych. Duża ilość wybuchów powtarzających się rocznie jest główną przyczyną osłabienia więzi skalnej w masie wraz z rozprzestrzenianiem się fal sejsmicznych z wybuchów powodują więc drgania i niszczenie warstwy, osuwisko kopalniane i różne deformacje nieciągłe. W artykule, przedstawiono metody wyznaczenia granicznych parametrów robót strzałowych oraz diagram wybuchów w celu zwiększenia stabilności zbocza w kamieniołomie nr 1 -Tan Cang 1 w Wietnamie.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 155-162
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of Occurrence, Ecological and Health Risk of Heavy Metals in Agricultural Soil in the Hau Giang Province, Vietnam
    Autorzy:
    Hong, Tran Thi Kim
    Dan, Truong Hoang
    Giao, Nguyen Thanh
    Powiązania:
    https://bibliotekanauki.pl/articles/2173352.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    agricultural soil
    ecological risk
    health risk
    Hau Giang province
    Opis:
    The study aimed to evaluate the occurrence of some heavy metals in agricultural soil in the Hau Giang province, Vietnam. The geographical accumulation index (Igeo), pollutant load index (PLI) and ecological risk index (RI) are used to assess the pollution levels and potential ecological risks due to the presence of heavy metals in agricultural soil. The results showed that the mean concentrations of Cu, Pb and Zn in the soil ranged from 16.25–40.32, 18.05–29.92 and 52.78–147.22 mg/kg, respectively, within the limits of QCVN 03-MT:2015/BTNMT. Cluster analysis showed that Pb originated from the process of using fertilizers, especially phosphate fertilizers in farming. Cu and Zn possibly share a common origin from the use of pesticides and fungicides in agricultural production. The Igeo value of Cu, Pb and Zn gradually increases in the order of Cu < Zn < Pb. The PLI (1.03–1.97) reflected that the soil in the study area is moderately polluted. The RI (14.80–25.33) represented a low potential ecological risk. In particular, position D3 had the highest level of pollution and risk among the study sites. Pb had the highest level of accumulation in soil with the highest single ecological risk factor; thus, measures should be taken to limit the source of Pb generation. The results of the study also indicated that ingestion route is the main exposure pathway by which heavy metals can be harmful to humans.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 9; 61--71
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Business strategy during Covid pandemic event: survival plans of instant coffee manufacturers in Vietnam
    Strategia biznesowa podczas pandemii Covid: plany przetrwania producentów kawy natychmiastowej w Wietnamie
    Autorzy:
    Tran, Van Nguyen An
    Do, Thi Thanh Nhan
    Novak, Petr
    Powiązania:
    https://bibliotekanauki.pl/articles/27315189.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    covid pandemic
    business strategy
    instant coffee
    pandemia Covid
    strategia biznesowa
    kawa rozpuszczalna
    Opis:
    In Vietnam, the covid situation started in the beginning of 2020 but not until May 2021, it severely impacts the country economically and socially. Some of the top instant coffee producers in Vietnam are struggling to calibrate their business decision-making to survive but others are taking advantage of the situation and fetch for opportunistic expansion. The theoretical framework initiates a global examination in the coffee industry to seek understandings through different business approaches from international organizations against the pandemic and determines dominant components succor firms to overcome adversities. Specifically, this study focuses on understanding the business strategies of Vietnam instant coffee manufacturers using business case study and unstructured interview. The result unveils that for the company survival plan categorizes into three directions: expanding, hibernating, and idling tactic. The paper suggests that during the pandemic event, the business decision-making highly relates to the degree of automation and liquidation. Furthermore, the study suggests that the decision of whether to embrace vertical or horizontal acquisition tactic during this period is a dependent variable with the magnitude of synchronization among the firm sub-business ecosystem. The study, hence, suggested instant coffee manufacturer to establish a set of backup plan in case of unexpected pandemic occasions by improving their automation degree and upgrading its liquidation channels.
    W Wietnamie sytuacja krukowa zaczęła się na początku 2020 r., ale dopiero w maju 2021 r. ma poważny wpływ na gospodarczo i społecznie kraj. Niektórzy z czołowych producentów kawy rozpuszczalnej w Wietnamie walczą o dostosowanie swoich decyzji biznesowych, aby przetrwać, ale inni wykorzystują sytuację i szukają oportunistycznej ekspansji. Ramy teoretyczne inicjują globalne badanie branży kawowej w celu znalezienia zrozumienia poprzez różne podejścia biznesowe organizacji międzynarodowych przeciwko pandemii i określają dominujące elementy, które pomagają firmom przezwyciężać przeciwności losu. W szczególności niniejsze badanie koncentruje się na zrozumieniu strategii biznesowych wietnamskich producentów kawy rozpuszczalnej przy użyciu studium przypadku biznesowego i nieustrukturyzowanego wywiadu. Wynik pokazuje, że plan przetrwania firmy dzieli się na trzy kierunki: taktyka ekspansji, hibernacji i bezczynności. Artykuł sugeruje, że podczas pandemii podejmowanie decyzji biznesowych w dużym stopniu zależy od stopnia automatyzacji i likwidacji. Ponadto badanie sugeruje, że decyzja, czy przyjąć taktykę pionowego lub poziomego przejęcia w tym okresie, jest zmienną zależną o wielkości synchronizacji między ekosystemem podfirmowym firmy. Badanie sugerowało zatem producentowi kawy rozpuszczalnej ustalenie planu awaryjnego na wypadek nieoczekiwanych sytuacji pandemii poprzez poprawę stopnia ich automatyzacji i unowocześnienie kanałów likwidacji.
    Źródło:
    Polish Journal of Management Studies; 2022, 25, 2; 357--374
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    How market concentration and liquidity affect non-performing loans: evidence from Vietnam
    Jak koncentracja rynku i płynność wpływają na kredyty zagrożone : dowód z Wietnamu
    Autorzy:
    Tran, Oanh Kim Thi
    Nguyen, Diep Van
    Duong, Khoa Dang
    Powiązania:
    https://bibliotekanauki.pl/articles/27315251.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    bank liquidity
    non-performing loans
    bank funding diversity
    płynność banków
    HHI
    kredyty zagrożone
    zróżnicowanie finansowania banków
    Opis:
    The present study is the first to estimate the impacts of market concentration and liquidity on the non-performing loans in Vietnam, a transitional economy in Asia. This research is unique because government-owned banks secure unprecedented market power against private banks in Vietnam. The data is collected from 33 Vietnamese banks from 2009 to 2020. The study employs the Random Effect Models and the two-step system Generalized Method of Moments to analyze the results. The empirical findings document an inversed relationship between market concentration and non-performing loans. Specifically, when the Herfindahl-Hirschman Index increases by one point, the non-performing loans ratio reduces by 0.1%. However, the non-performing loans of commercial banks in Vietnam are positively empowered by liquidity. The findings of the study imply that a percentage increase in bank funding diversity and liquidity creation cause non-performing loans to rise by 0.52% and 0.3%, respectively. The results are supported by the bank concentration and stability theory, the "too-big-to-fail" hypothesis, and prior literature. The study outcomes are relevant for policymakers to develop banking system stability. The present study also provides recommendations for bank managers and policymakers to control the non-performing loans of commercial banks. The authors suggest future studies explore this topic across the country to generalize in-depth insights.
    Niniejsze badanie jest pierwszym, w którym oszacowano wpływ koncentracji rynku i płynności na kredyty zagrożone w Wietnamie, gospodarce w Azji w okresie przejściowym. Badanie jest unikalne , ponieważ banki będące własnością rządu zabezpieczają bezprecedensową siłę rynkową wobec banków prywatnych w Wietnamie. Dane zebrano z 33 wietnamskich banków w latach 2009-2020. W badaniu wykorzystano modele efektów losowych i dwustopniowy system uogólnionej metody momentów do analizy wyników. Wyniki badań empirycznych dokumentują odwrotną zależność między koncentracją na rynku a kredytami zagrożonymi. W szczególności, gdy indeks Herfindahla-Hirschmana wzrastao jeden punkt, wskaźnik kredytów zagrożonych zmniejsza się o 0,1%. Jednakże, zagrożone kredyty banków komercyjnych w Wietnamie są pozytywnie wzmacniane przez płynność. Wyniki badania sugerują, że procentowy wzrost zróżnicowania finansowania banków i tworzenia płynności powoduje wzrost kredytów zagrożonych odpowiednio o 0,52% i 0,3%. Wyniki są poparte teorią koncentracji i stabilności banków, hipotezą „zbyt duży, by upaść” oraz wcześniejszą literaturą. Wyniki badań są istotne dla decydentów politycznych w zakresie rozwoju stabilności systemu bankowego. Niniejsze badanie zawiera również zalecenia dla menedżerów banków i decydentów dotyczące kontroli kredytów zagrożonych w bankach komercyjnych. Autorzy sugerują, że przyszłe badania ten temat prowadzone były w całym kraju, aby uogólnić dogłębne spostrzeżenia.
    Źródło:
    Polish Journal of Management Studies; 2022, 26, 1; 325--337
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    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:
    Sandy Soil Reclamation Using Biochar and Clay-Rich Soil
    Autorzy:
    Thi, Diep Pham
    Hang, Nga Nguyen Thi
    Viet, On Tran
    Van, Loc Nguyen
    Viet, Anh Nguyen
    Lan, Phuong Dinh Thi
    Van, Nguyen Vu
    Powiązania:
    https://bibliotekanauki.pl/articles/1838287.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    sandy soil
    biochar
    clay-rich soil
    physical properties
    chemical properties
    Opis:
    The investigations on the effects of biochar application in improving the physio-chemical properties of soil have been carried out in many studies; however, there are very few studies on the combined use of both biochar and clay-rich soil for poor nutrient soil reclamation. Therefore, this study demonstrates improved water retention and nutrient retention of sandy soil by using biochar and biochar combined with clay-rich soil. The experiments were conducted on a small scale (greenhouse) with nine different application rates of biochar and clay-rich soil were mixed and then cultivated peanut, along with the drip irrigation technique using field moisture limit (about 70-80%) was applied under the condition of ensuring a sufficient supply of NPK for plant’s growth. The results showed that at the rates from 10.0-15.0% (w/w) clay-rich soil mixed with from 0.5-1.5% (w/w) of biochar applied to the tested sandy soil resulted in the positive effects on soil water holding, bulk density, permeability, pH, CEC, OM, total N, total P and peanut yield. The physical and chemical characteristics of the tested sandy soil have been improved by time and the application rate of 10.0% clay-rich soil and 0.5% biochar had the highest efficiency of pod fresh weight and pod dry weight during three studied seasons.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 6; 26-35
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sandy Soil Reclamation Using Biochar and Clay-Rich Soil
    Autorzy:
    Thi, Diep Pham
    Hang, Nga Nguyen Thi
    Viet, On Tran
    Van, Loc Nguyen
    Viet, Anh Nguyen
    Lan, Phuong Dinh Thi
    Van, Nguyen Vu
    Powiązania:
    https://bibliotekanauki.pl/articles/1838394.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    sandy soil
    biochar
    clay-rich soil
    physical properties
    chemical properties
    Opis:
    The investigations on the effects of biochar application in improving the physio-chemical properties of soil have been carried out in many studies; however, there are very few studies on the combined use of both biochar and clay-rich soil for poor nutrient soil reclamation. Therefore, this study demonstrates improved water retention and nutrient retention of sandy soil by using biochar and biochar combined with clay-rich soil. The experiments were conducted on a small scale (greenhouse) with nine different application rates of biochar and clay-rich soil were mixed and then cultivated peanut, along with the drip irrigation technique using field moisture limit (about 70-80%) was applied under the condition of ensuring a sufficient supply of NPK for plant’s growth. The results showed that at the rates from 10.0-15.0% (w/w) clay-rich soil mixed with from 0.5-1.5% (w/w) of biochar applied to the tested sandy soil resulted in the positive effects on soil water holding, bulk density, permeability, pH, CEC, OM, total N, total P and peanut yield. The physical and chemical characteristics of the tested sandy soil have been improved by time and the application rate of 10.0% clay-rich soil and 0.5% biochar had the highest efficiency of pod fresh weight and pod dry weight during three studied seasons.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 6; 26-35
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plans for better business performance of Sony in Japan - and suggestions for management and financial accounting transparency
    Autorzy:
    Dat, Nguyen Duy
    Lan, Nguyen Thi Ngoc
    Huy, Dinh Tran Ngoc
    Yen, Ly Lan
    Dung, Nguyen Tien
    Dat, Pham Minh
    Powiązania:
    https://bibliotekanauki.pl/articles/1818317.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    Sony company
    business performance
    stock prices
    lending rate
    market interest rate
    firma Sony
    wyniki biznesowe
    zysk netto
    cena akcji
    kredyt
    rynkowa stopa procentowa
    Opis:
    Through years Sony in Japan has shown success in bringing to themarket high quality products, and via technical inventions. Today risk management is one of vital issues in Sony to maintain its reputation in global markets. The purpose of this study is to find out impacts of economic factors at macro level on net profit of a big technological giant like Sony. We found that movement of net profit in big firms such as Sony will reflect the business health of technology system and the whole economy. The results of quantitative research, in a seven factor model, show that the increase in inflation, GDP (increasing too much) and lending rate and reducing risk free rate has a significant effect on reducing Sony net profit with the highest impact coefficient, the second is decreasing the exchange rate. Last but not least, this study proposes risk management solutions and business management plans to lower business risks, cost and enhance its net profit.
    Źródło:
    Management; 2020, 24, 2; 132-145
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applying Artificial Pillar to Replace the Coal Pillar Protecting Roadway to Increase Production Efficiency and Sustainable Development in the Vietnamese Coal Industry
    Autorzy:
    Dinh, Van Cuong
    Nguyen, Anh Tuan
    Tran, Van Thanh
    Nguyen, Thi Hoai Nga
    Duong, Duc Hai
    Powiązania:
    https://bibliotekanauki.pl/articles/2020898.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    coal pillar protecting roadways
    coal loss
    artificial pillar
    underground mine
    filary węglowe
    górnictwo podziemne
    ubytki węgla
    Opis:
    Vietnam's domestic coal production is growing fast and is expected to reach 68.9 million tons in 2030, nearly 1.5 times higher than today. Open-pit mines will gradually reduce production and close, and underground mining coal output will increase progressively year by year and take a leading role. Besides the investment in new mines to achieve these goals, it is necessary to maximize the coal reserve exploited annually of existing underground mine projects, which its coal reserve in pillars protecting roadways currently accounts for 12−15%. The further exploitation of this coal reserve will decrease the costs of preparation of underground mines and granting mining rights and depreciation of infrastructure assets. Moreover, it will help reduce the loss of non-renewable resources and contributing to the sustainable development of Vietnam’s coal industry.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 587--597
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    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:
    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:
    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:
    Optimization of Lycopene Extraction from Tomato Pomace and Effect of Extract on Oxidative Stability of Peanut Oil
    Autorzy:
    Tran, Dinh T.
    Nguyen, Lan T.
    Nguyen, Cuong N.
    Hertog, Maarten L.
    Nicolaï, Bart
    Picha, David
    Powiązania:
    https://bibliotekanauki.pl/articles/16538548.pdf
    Data publikacji:
    2023-07-05
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    Antioxidant
    Response surface methodology
    Optimization
    Lycopene
    Extraction
    Peanut oil stability
    Opis:
    Lycopene, the pigment principally responsible for the red color of tomatoes, is well-known for its strong antioxidant property and substantial health benefits. In this study, the optimal combination of factors for lycopene extraction from tomato pomace was identified using response surface methodology. The best practically feasible results maximizing both lycopene yield and antioxidant activity of the extract were obtained by applying a ratio of ethyl acetate to tomato waste of 35:1 (v/w), at a temperature of 55ºC for 100 min of extraction. The extract was then added to the peanut oil to evaluate its oxidative stability during 60 days of storage at 40ºC. It was shown that the addition of 2 g extract/kg oil offered the lowest level of peroxide value, p-anisidine value, and total oxidation value, followed by the oils with 50 mg butylated hydroxytoulene/kg oil and 1 g extract/kg oil, indicating the effect of lycopene-rich extract on enhancing the oxidative stability of peanut oil. The results in this study suggest that incorporation of extract rich in lycopene from tomato waste products may be an effective method to reduce oxidation and extend the shelf-life of peanut and other vegetable oils.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2023, 73, 3; 205-213
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    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:
    Overview of the Activities of Industrial Parks and Impacts on Surface Water Quality in Ho Chi Minh City, Vietnam
    Przegląd działalności parków przemysłowych i wpływ na jakość wód powierzchniowych w Ho Chi Minh City, Wietnam
    Autorzy:
    Phan, Dao
    Nguyen, Thuy Lan Chi
    Lapcik, Vladimir
    Tran, Cam Nhung
    Powiązania:
    https://bibliotekanauki.pl/articles/318704.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    zanieczyszczenia
    parki przemysłowe
    wody powierzchniowe
    rzeka Sai Gon
    pollutions
    industrial parks
    surface water
    Sai Gon river
    Opis:
    Ho Chi Minh City is an economic, commercial, financial and service center of Vietnam, concentrating many industrial and export processing zones with large scale and high growth rate. After nearly 30 years of construction and development (1991-2019), industrial parks and export processing zones have been formed, diversified and actively contributed to the socio-economic and industrial development. However, along with it, the level of environmental pollution caused by IPs and EPZs is increasing, becoming a threat to sustainable economic growth. This article provides an overview of the current status of operations as well as impacts on surface water from the operation of some industrial parks (IPs), export processing zones (EPZs) in Ho Chi Minh City, Vietnam.
    Ho Chi Minh City jest ekonomicznym, handlowym, finansowym i usługowym centrum Wietnamu, skupiającym wiele stref przetwórstwa przemysłowego i eksportowego o dużej skali i wysokim tempie wzrostu. Po prawie 30 latach budowy i rozwoju (1991–2019), parki przemysłowe i strefy przetwórstwa eksportowego zostały utworzone, zróżnicowane i aktywnie przyczyniły się do rozwoju społeczno-gospodarczego i przemysłowego. Jednak wraz z nim wzrasta poziom zanieczyszczenia środowiska powodowanego przez IP i EPZ, stając się zagrożeniem dla zrównoważonego wzrostu gospodarczego. Artykuł zawiera przegląd obecnego stanu operacji, a także wpływu na wody powierzchniowe wynikające z funkcjonowania niektórych parków przemysłowych (IP), stref przetwórstwa eksportowego (EPZ) w Ho Chi Minh City w Wietnamie.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 1/2; 81-86
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An efficient pedestrian attribute recognition system under challenging conditions
    Autorzy:
    Nguyen, Ha X.
    Hoang, Dong N.
    Tran, Tuan A.
    Dang, Tuan M.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200444.pdf
    Data publikacji:
    2023
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Instytut Informatyki Technicznej
    Tematy:
    pedestrian attribute recognition
    Deep Learning
    vision transformer
    security surveil-lance
    Opis:
    In this work, an efficient pedestrian attribute recognition system is introduced. The system is based on a novel processing pipeline that combines the best-performing attribute extraction model with an efficient attribute filtering algorithm using keypoints of human pose. The attribute extraction models are developed based on several state-of-the-art deep networks via transfer learning techniques, including ResNet50, Swin-transformer, and ConvNeXt. Pre-trained models of these networks are fine-tuned using the Ensemble Pedestrian Attribute Recognition (EPAR) dataset. Several optimization techniques, including the advanced optimizer Adam with Decoupled Weight Decay Regularization (AdamW), Random Erasing (RE), and weighted loss functions, are adopted to solve issues of data unbalancing or challenging conditions like partial and occluded bodies. Experimental evaluations are performed via EPAR that contains 26 993 images of 1477 person IDs, most of which are in challenging conditions. The results show that the ConvNeXt-v2-B outperforms other networks; mean accuracy (mA) reaches 85.57%, and other indices are also the highest. The addition of AdamW or RE can improve accuracy by 1-2%. The use of new loss functions can solve the issue of data unbalancing, in which the accuracy of data-less attributes improves by a maximum of 14% in the best case. Significantly, when the attribute filtering algorithm is applied, the results are dramatically improved, and mA reaches an excellent value of 94.85%. Utilizing the state-of-the-art attribute extraction model with optimization techniques on the large-scale and diverse dataset and attribute filtering has shown a good approach and thus has a high potential for practical applications.
    Źródło:
    Machine Graphics & Vision; 2023, 32, 2; 3--18
    1230-0535
    2720-250X
    Pojawia się w:
    Machine Graphics & Vision
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation on Flyrock due to Blasting Using Smoothed Particle Hydrodynamics (SPH) with LSDyna software
    Autorzy:
    Dinh, Bao Tran
    Van, Trieu Do
    Van, Viet Pham
    An, Nguyen Dinh
    Powiązania:
    https://bibliotekanauki.pl/articles/24200704.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    flyrock
    smoothed particle hydrodynamics
    simulation
    blasting
    LS-Dyna
    Opis:
    In surface mining operation, blasting method has been commonly used and accounted highly for breaking waste rock and mineral. The main goal of the activity is fundamental fragmentation by energy generation due to blasting. However, only 20% to 30% blasting energy is generated to fragment rock. The remain energry is wasted for flyrock, ground vibration, air overpressure, dust and too fine fragmentation. Flyrock in blasting is large risk for surface mines and occupies more than a half of incidents relating to blasting at surface mines, because this is a severe issue and causes negative reaction of the surrounding residients. However, studies on flyrock-phenomenon prediction methods for blasting in Vietnam have been also limited. In the study, simulation analysis method on induce-blasting-induced flyrock experiment using Smoothed Particle Hydrodynamics (SPH) with LS-Dyna software. Two-dimension modelling was built and practically applied for B2 cross section of Mong Son quarry in Yen Bai province. The result showed that the ability of Smoothed Particle Hydrodynamics (SPH) in analysizing flyrock trajectory distance in blasting. By using the modelling with field-site parameters, the researcher monitored flyrock velocity at installed time periods, such as 1.5 second when the flyrocks fly with a maximum distance of 85 m from blasting site and their average velocity of 40 m/s.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 13--21
    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:
    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:
    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:
    Dimension-Stone Quarrying Optimization through Integrated Modelling between Joint Sets and Cutting Grid: a Case Study at Tan Long Dimension Stone Quarry in Southcentral Coastal Province of Binh Dinh
    Autorzy:
    Pham, Van Viet
    Nguyen, Anh Tuan
    Pham, Van Hoa
    Tran, Dinh Bao
    Powiązania:
    https://bibliotekanauki.pl/articles/27323286.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    dimension stone
    modelling
    joint sets
    block size
    recovery ratio
    cutting rat
    kamienie
    rozmiar
    kamieniołomy
    Wietnam
    Opis:
    Dimension-stone quarrying optimization is significantly important to increase the recovery ratio of dimension stone and to reduce the cutting cost. Due to fracture-existed rock mass, in the mining operation block size and mining direction influences to the recovery ratio and the cutting cost. Therefore, the paper suggests the quarrying optimization for dimension stone to obtain the highest recovery ratio and the lowest cutting cost, based on optimizing block size and mining direction to get a cutting grid of dimension stone. Through developing an integrated modelling between joint set modelling and cutting grid modelling, intact blocks and fractured blocks were generated. From this, block statistics were conducted to get the maximum recovery ratio of dimension stone and the minimum cutting rate between the cutting area and the recovered block volume, which helps to choose an optimizing block size and mining direction. The research was carried out at Tan Long dimension stone quarry where a block size (0.9m x 0.6m x 1.35m) and a mining direction paralleling to joint set 1 will ensure the highest recovery ratio of 13.87% and the lowest cutting rate of 25 m2/m3.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 239--248
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Femtosecond Optical Breakdown as a Source of the Extreme States of Matter
    Autorzy:
    Janulewicz, K.
    Rehman, Z.
    Nguyen, V.
    Le, N.
    Tran, K.
    Grigorov, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030649.pdf
    Data publikacji:
    2018-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Eb
    64.60.A-
    47.40.Nm
    Opis:
    It is well known that from the two fundamental thermodynamic parameters pressure p is much more efficient in transformation of the matter state than temperature T. Optical breakdown in a form of microexplosion proved to be a simple, cheap, and efficient source of transient extreme pressure and temperature. Our interest is focused on the breakdown performed with femstosecond laser pulses both on a surface and in the bulk of material. The paper delivers some examples of the transformation effects observed mostly in the transparent dielectrics under irradiation with femtosecond laser pulses.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 2; 292-295
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developing an Advanced Soft Computational Model for Estimating Blast-Induced Ground Vibration in Nui Beo Open-pit Coal Mine (Vietnam) Using Artificial Neural Network
    Opracowanie zaawansowanego modelu obliczeniowego do szacowania wibracji gruntu wywołanych wybuchem w odkrywkowej kopalni węgla Nui Beo (Wietnam) przy użyciu sztucznej sieci neuronowej
    Autorzy:
    Nguyen, Hoang
    Bui, Xuan‑Nam
    Tran, Quang Hieu
    Nguyen, Quoc Long
    Vu, Dinh Hieu
    Pham, Van Hoa
    Le, Qui Thao
    Nguyen, Phu Vu
    Powiązania:
    https://bibliotekanauki.pl/articles/317864.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    Wietnam
    górnictwo odkrywkowe
    sieci neuronowe
    Vietnam
    open pit mining
    artificial neural network
    Opis:
    The principal object of this study is blast-induced ground vibration (PPV), which is one of the dangerous side effects of blasting operations in an open-pit mine. In this study, nine artificial neural networks (ANN) models were developed to predict blast-induced PPV in Nui Beo open-pit coal mine, Vietnam. Multiple linear regression and the United States Bureau of Mines (USBM) empirical techniques are also conducted to compare with nine developed ANN models. 136 blasting operations were recorded in many years used for this study with 85% of the whole datasets (116 blasting events) was used for training and the rest 15% of the datasets (20 blasting events) for testing. Root Mean Square Error (RMSE), Determination Coefficient (R2), and Mean Absolute Error (MAE) are used to compare and evaluate the performance of the models. The results revealed that ANN technique is more superior to other techniques for estimating blast-induced PPV. Of the nine developed ANN models, the ANN 7-10-8-5-1 model with three hidden layers (ten neurons in the first hidden layer, eight neurons in the second layers, and five neurons in the third hidden layer) provides the most outstanding performance with an RMSE of 1.061, R2 of 0.980, and MAE of 0.717 on testing datasets. Based on the obtained results, ANN technique should be applied in preliminary engineering for estimating blast-induced PPV in open-pit mine.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 2/2; 58-73
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research the Integration of Geodetic and Geotechnical Methods in Monitoring the Horizontal Displacement of Diaphragm Walls
    Autorzy:
    Pham, Quoc Khanh
    Tran, Ngoc Dong
    Nguyen, Thi Kim Thanh
    Pham, Van Chung
    Powiązania:
    https://bibliotekanauki.pl/articles/2020165.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    deformation monitoring
    diaphragm wall
    engineering surveying
    soft ground
    deformacje
    monitoring
    grunt
    Opis:
    This article investigates the integration of geodetic and geotechnical methods for monitoring the horizontal displacement of diaphragm walls. The results show that when the horizontal displacement is measured by the geotechnical method using an inclinometer sensor, the center point at the bottom of the guide pipe is usually chosen to be the origin to calculate displacements of the upper points. However, it is challenging to survey the bottom point for checking its stability directly. If this bottom point moves, the observation results will be incorrect. Thus, the guide pipe must be installed in the stable rock layer. But in the soft ground, this rock layer locates more deeply than the diaphragm walls, so the guide pipe cannot be laid out at the required location. Geodetic methods can directly observe the displacement of the center point on the top of the guide pipe with absolute displacement values at high accuracy. Because the displacements of observation points are determined at stable benchmarks, these values are considered the pipe's displacement. Thus, an integrated solution allows the center point on the top of the pipe to be the origin to calculate the displacements of different points located inside the diaphragm wall. Then, the calculated values are calibrated back to the inclinometer observed values to achieve highly reliable displacement, which reflects the moving of diaphragm walls. An experiment integrating the geodetic and geotechnical methods is conducted with an observation point at a depth of 20 meters at a construction site in Ho Chi Minh city. The deviations of the top point that are observed by the two methods are -4.37 millimeters and -3.69 millimeters on the X-axis and the Y-axis, respectively. The corrected observed results prove that the integrated solution has a good efficiency in monitoring the horizontal displacement of diaphragm walls. The bottom point observed by an inclinometer is unconfident enough to choose to be a reference point.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 331--340
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    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:
    Internal Micro-electrolysis Using Fe/C Material for Pre-Treatment of Concentrated Coking Wastewater
    Autorzy:
    Nguyen, Van Tu
    Do, Tra Huong
    Vu, Duy Nhan
    Ngan, Tran Thi Kim
    Powiązania:
    https://bibliotekanauki.pl/articles/1849313.pdf
    Data publikacji:
    2021
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    internal micro-electrolysis
    Fe/C material
    wastewater treatment
    coking wastewater
    Opis:
    Untreated coking effluent presents a great challenge for sustainable development of the steel industry and environment preservation. In this study, an internal micro-electrolysis method using Fe/C materials was employed for pretreatment of real coking wastewater with high mass concentration. The Fe/C materials were prepared by Fe powder and graphite powder; and the characteristics of surface morphology, structure, composition of the synthesized materials were examined by Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Energy Dispersive X-ray Spectroscopy (EDS). The effects of factors namely dosage of Fe/C material, treatment time, initial pH and temperature were investigated via chemical oxygen demand (COD) and phenol removal efficiencies. Optimal treatment efficiency was attained at pH of 4, Fe/C dosage of 40 g/L, treatment time of 360 minutes and temperature of 25°C. After the internal electrolysis process, the values of COD, BOD5, and phenol of the wastewater were 6500, 4850 and 0.1 mg/L, respectively.
    Źródło:
    Polish Journal of Chemical Technology; 2021, 23, 2; 41-46
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-step Homogenization of Poroelastic Properties of a Limestone
    Dwu-etapowa homogenizacja właściwości poroelastycznych wapienia
    Autorzy:
    Trieu, Hung Truong
    Nguyen, Ngoc Bien
    Pham, Duc Tho
    Vu, Minh Ngoc
    Do, Ngoc Anh
    Nguyen, Sy Tuan
    Tran, Nam Hung
    Nguyen, Thi Thu Nga
    Powiązania:
    https://bibliotekanauki.pl/articles/318822.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    oolitic limestone
    tow-step homogenization
    CSA
    poro-elastic properties
    differential self-consistent
    wapień oolityczny
    homogenizacja dwuetapowa
    właściwości poroelastyczne
    zróżnicowana spójność własna
    Opis:
    This study aims at deriving the effective poroelastic properties of the oolitic limestones based on the Hashin composite sphere assemblage (CSA) micromechanical theory. The microstructure of oolitic limestones generally exhibits an assemblage of grains (oolites) surrounded by a matrix. Grain and matrix are linked via the interfacial transition zone (ITZ). Pores exist in these three material phases (oolite, ITZ and matrix). A two-step homogenization method is proposed. The first step consists of upscaling the properties of each porous phase (i.e. porous oolite, porous ITZ and porous matrix) in which each phase contains two sub-phases including pore and solid. The differential self-consistent scheme is used for the first step. At the second step, the three different porous constituents (oolite, ITZ and matrix) are assembled in a CSA model. A mathematical analogy between thermoelasticity and poroelasticity is used to obtain the effective poroelastic properties. A comparison between the proposed model and test data on the oolitic limestone from Bourgogne (France) helps to calibrate the model parameters and to highlight the role of ITZ phase.
    W artykule, przedstawiono wyniki badań efektywnych właściwości poroelastycznych wapieni oolitowych w oparciu o teorię mikromechaniczną złożonego zespołu kul Hashin (CSA). Mikrostruktura wapieni oolitycznych wykazuje generalnie zbiór ziaren (oolitów) otoczonych matrycą. Ziarno i matryca są połączone za pośrednictwem międzyfazowej strefy przejściowej (ITZ). W tych trzech fazach materiału (oolit, ITZ i matryca) istnieją pory. Zaproponowano dwuetapową metodę homogenizacji. Pierwszy etap polega na zwiększeniu skali właściwości każdej porowatej fazy (tj. Porowatego oolitu, porowatej ITZ i porowatej matrycy), w której każda faza zawiera dwie podfazy: porową i stałą. W pierwszym etapie zastosowano różnicowy schemat samouzgodnienia. Na drugim etapie trzy różne porowate składniki (oolit, ITZ i matryca) są składane w modelu CSA. Matematyczne analogie między termosprężystością a poroelastycznością są wykorzystywane do uzyskania efektywnych właściwości poroelastycznych. Porównanie proponowanego modelu z danymi testowymi dotyczącymi wapienia oolitycznego z Bourgogne (Francja) pomaga skalibrować parametry modelu i podkreślić rolę fazy ITZ.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 31-39
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cellulase Treatment of Acerola Seeds and Its Effect on Physicochemical Properties and Antioxidant Potential of Dietary Fiber-Rich Cookies
    Autorzy:
    Tran, Van Nguyen
    Dang, Diep Xuan Thao
    Pham, Thi Kim Oanh
    Tran, Thi Quynh Nhi
    Ton, Nu Minh Nguyet
    Tran, Thi Thu Tra
    Le, Van Viet Man
    Powiązania:
    https://bibliotekanauki.pl/articles/48899277.pdf
    Data publikacji:
    2024-09-03
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    bakery product
    cellulolysis
    dimensional characteristics
    Malpighia emarginata
    proximate composition
    textural analysis
    Opis:
    Acerola seeds are a by-product of the food industry, which is rich in dietary fiber and antioxidants. This study evaluated the effects of cellulase treatment conditions, including the initial moisture content, enzyme dose, and incubation time, on the insoluble, soluble, and total dietary fiber content of acerola seed powder (ASP). The blends of wheat flour with untreated and cellulase-treated ASP (0, 10, 15, 20, 25, and 30%, w/w) were then used to produce cookies. The suitable conditions for the enzymatic treatment were the initial moisture content of 6 g/g dry weight (DW), an enzyme dose of 10 U/g DW and incubation time of 90 min. The cookies produced from flour blends with ASP had higher dietary fiber, ascorbic acid and total phenolic contents, and antioxidant capacity, compared to the control cookies without ASP. Phytate content in the cookies obtained with the lowest level of fortification (10%, w/w) was similar to that in the control cookies. The use of cellulase-treated ASP resulted in a lower ratio of insoluble to soluble dietary fiber in the cookies compared to when the untreated ASP was used. In addition, the cookies with cellulase-treated ASP had lower hardness and higher fracturability values than those fortified with the untreated ASP. The overall acceptability of the cookies produced with ASP was higher or comparable to the control cookies. For the first time, the low-cost ASP was used to improve the nutritional quality of cookies. The treated ASP is a novel promising dietary fiber- and antioxidant-rich ingredient for cookie preparation.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2024, 74, 3; 268-279
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Separator taśmowy - modyfikacja stołów taśmowych typu Vanner zastosowana w Wietnamie
    Belt separator – Vanner type separators modification introduced in Vietnam
    Autorzy:
    Mijał, W.
    Nguyen, N.P.
    Pham, V.L.
    Tran, T.T
    Phung, T.T.
    Pham, T.H.
    Nguyen, H.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/166768.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Górnictwa
    Tematy:
    separator taśmowy
    separator typu Vanner
    węgiel kamienny
    wzbogacanie węgla
    próby wzbogacania
    górnictwo wietnamskie
    belt separator
    Vanner type separator
    hard coal
    coal beneficiation
    beneficiation tests
    Vietnam’s mining industry
    Opis:
    Separatory typu Vanner były stosowane głównie do wzbogacania rud takich jak: miedź, ołów, złoto itp.. Konstrukcja tego urządzenia była nietypowa, gdyż był to stół taśmowy, na którym następował rozdział materiału, podobnie jak na klasycznym stole koncentracyjnym. Urządzenie o podobnej konstrukcji jest stosowane do przeróbki węgla kamiennego w wietnamskim przemyśle wydobywczym. Hanoi University of Mining and Geology przeprowadzał wiele testów dla zastosowania tego urządzenia, a w niniejszym artykule zostanie przedstawiona część wyników, jakie uzyskiwano podczas projektowania węzła technologicznego dla węgla płukanego w zakładach Vang Danh i Uong Bi o uziarnieniu 3-20 mm.
    Vanner type separators were mainly used to enrich ores such as copper, lead, gold, etc. The construction of this device was atypical, because it was a belt table on which the material was separated like on a classic concentration table. A device of similar construction is used for processing hard coal in the Vietnam’s mining industry. Hanoi University of Mining and Geology has carried out many tests for the use of this device, and this paper presents some of the results obtained during the design of the technological node for the rinsed coal at the Vang Danh and Uong Bi plants with a grain size of 3-20 mm.
    Źródło:
    Przegląd Górniczy; 2018, 74, 5; 42-47
    0033-216X
    Pojawia się w:
    Przegląd Górniczy
    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:
    3D Spatial Interpolation Methods for Open-Pit Mining Air Quality with Data Acquired by Small UAV Based Monitoring System
    Metody interpolacji przestrzennej 3D dla oceny jakości powietrza w kopalniach odkrywkowych z danymi uzyskanymi przez system monitorowania oparty na pospolitym bezzałogowym statku powietrznym BSP
    Autorzy:
    Nguyen, Quoc Long
    Cao, Xuan Cuong
    Le, Van Canh
    Nguyen, Ngoc Bich
    Dang, An Tran
    Le, Qui Thao
    Bui, Xuan‑Nam
    Powiązania:
    https://bibliotekanauki.pl/articles/318546.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    air quality
    open-pit mines
    spatial interpolation
    UAV-MSC
    jakość powietrza
    kopalnie odkrywkowe
    interpolacja przestrzenna
    bezzałogowe statki powietrzne (BSP)
    Opis:
    Open-pit mining activities, including blasting, drilling, loading, and transport, often result in the direct emission of particulates and gases into the atmosphere. Occupational exposure to these pollutants is considered as the risk for health, especially the risk of developing respiratory diseases. An air quality monitoring system and spatial analysis are necessary to identify these potential hazards. In this study, we propose an air quality monitoring system that integrates gas and dust sensors into a small multi-rotor copter or unmanned aerial vehicle (UAV). Different spatial interpolation methods including trilinear interpolation, nearest neighbour, and natural neighbour applied to the monitoring data (CO, SO2, PM2.5, CO2) from our system to derive air concentration levels in the atmosphere of open-pit coal mines were also examined. The results show that the UAV based air quality monitoring system performed efficiently and safely in conditions of deep open-pit coal mines. In addition, for the estimation of the concentration level of gases and dust in unsampled points, trilinear interpolation performed with the most accurate result, followed by natural neighbor and nearest neighbor.
    Wielorakie działalności ư górnictwie odkrywkowym, w tym roboty strzelnicze, wiertnicze, załadowania, transport, zwałowania itp. często prowadzi do bezpośredniej emisji pyłów i gazów do atmosfery. Zanieczyszczenie powietrza na terenie zakładu górniczego uważane jest za zagrożenie dla zdrowia pracowników i górników, zwłaszcza ryzyko rozwoju chorób układu oddechowego. Aby zidentyfikować te potencjalne zagrożenia, niezbędny jest system monitorowania jakości powietrza i analiza przestrzenna. W artykule, przedstawiono wyniki zastosowania system monitorowania jakości powietrza, który integruje czujniki gazu i pyłu w pospolitym wielowirnikowym helikopterze lub bezzałogowym statku powietrznym (BSP). Zbadano również różne metody interpolacji przestrzennej, w tym interpolację trójliniową, najbliższego sąsiada i naturalnego sąsiada, zastosowane do danych z monitoringu (CO, SO2, PM2.5, CO2) z badanego systemu w celu wyznaczenia poziomów stężenia powietrza w atmosferze kopalni odkrywkowych. Wyniki pokazują, że system monitorowania jakości powietrza oparty na BSP działał sprawnie i bezpiecznie w warunkach głębokich odkrywkowych kopalń węgla kamiennego. Dodatkowo, do oszacowania poziomu stężeń gazów i pyłów w niepróbkowanych punktach zastosowano interpolację trójliniową z najdokładniejszym wynikiem, a po kolei naturalny sąsiad i najbliższy sąsiad.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 263-272
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Operations management and performance: a mediating role of green supply chain management practices in MNCs
    Zarządzanie i wydajność operacji: mediacyjna rola praktyk zarządzania zielonym łańcuchem dostaw w MNC
    Autorzy:
    Nguyet, Bui Thi Minh
    Huyen, Vu Ngoc
    Oanh, Thai Thi Kim
    Phuong, Nguyen Thi Minh
    Hang, Nguyen Phan Thu
    Uan, Tran Ba
    Powiązania:
    https://bibliotekanauki.pl/articles/2021544.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    operational management
    total quality management
    just-in-time
    operational performance
    green supply chain practices
    zarządzanie operacyjne
    kompleksowe zarządzanie jakością
    wydajność operacyjna
    praktyki zielonego łańcucha dostaw
    Opis:
    Recently, operational and supply chain management practices are considered the foremost solution for high operational performance and gain recent researchers' intentions. Thus, the present study aims to examine the role of operational management practices such as extensive training, teamwork, total quality management and just-in-time on the multinational organization's operational performance in Vietnam. The goals also include the examination of the mediating impact of green practices of supply chain among the nexus of operational management practices and operational performance of the multinational organization in Vietnam. The operational and supply chain managers of the multinational organization in Vietnam are the respondents of the study that have been selected by using purposive sampling. The questionnaires have been sued for the data collection, and smart-PLS has been executed for analysis. The results revealed that all the operational management practices have a positive and significant association with multinational organizations’ operational performance in Vietnam. The findings also exposed that the supply chain's green practices are positively mediating among the nexus of operational management practices and operational performance of the multinational organization in Vietnam. These outcomes are suitable for the regulators to develop the policies related to the operational and supply chain practices that could increase organizational performance.
    Ostatnio praktyki zarządzania operacyjnego i zarządzania łańcuchem dostaw są uważane za najważniejsze rozwiązanie zapewniające wysoką wydajność operacyjną i zyskują najnowsze zamierzenia badaczy. W związku z tym niniejsze badanie ma na celu zbadanie roli praktyk zarządzania operacyjnego, takich jak szeroko zakrojone szkolenia, praca zespołowa, kompleksowe zarządzanie jakością i „just in time” na wyniki operacyjne organizacji wielonarodowej w Wietnamie. Cele obejmują również zbadanie pośredniczącego wpływu ekologicznych praktyk w łańcuchu dostaw w powiązaniu praktyk zarządzania operacyjnego i wyników operacyjnych wielonarodowej organizacji w Wietnamie. Kierownicy operacyjni i łańcucha dostaw międzynarodowej organizacji w Wietnamie są respondentami badania, którzy zostali wybrani na podstawie celowego pobierania próbek. Kwestionariusze zostały pozwane w celu zebrania danych, a smart-PLS został wykonany do analizy. Wyniki ujawniły, że wszystkie praktyki zarządzania operacyjnego mają pozytywny i znaczący związek z wynikami operacyjnymi organizacji międzynarodowych w Wietnamie. Ustalenia ujawniły również, że zielone praktyki łańcucha dostaw pozytywnie pośredniczą w powiązaniu praktyk zarządzania operacyjnego i wyników operacyjnych wielonarodowej organizacji w Wietnamie. Wyniki te są odpowiednie dla organów regulacyjnych do opracowania polityk związanych z praktykami operacyjnymi i praktykami łańcucha dostaw, które mogą zwiększyć wydajność organizacji.
    Źródło:
    Polish Journal of Management Studies; 2020, 22, 2; 309-323
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    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:
    Radon-Radium Thermal Mineral Water in Vo Am Ecotourism Project Area, Ngoc Luong Commune, Yen Thuy District, Hoa Binh Province, Vietnam
    Autorzy:
    Ban, To Xuan
    Dung, Le Tien
    Duc, Tran Van
    Trong, Nguyen Huu
    Tuan, Truong Duc
    Powiązania:
    https://bibliotekanauki.pl/articles/27323255.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    thermal mineral water
    Ngoc Luong
    Hoa Binh
    Vietnam
    wody termalne
    wody mineralne
    Wietnam
    Opis:
    Ngoc Luong thermal mineral water at Vo Am ecotoursim, Ngoc Luong commnune, Yen Thuy district, Hoa Binh province, northern Vietnam. The thermal mineral water source is at karstic-fractured limstones of Dong Giao Formation aged Anisi. Methods used in this study conists of basic field survey of hydrogeology, resistivity, borehole drilling, pumping tests, and thermal mineral water sample analysis. The thermal mineral water is classified as radon-radium, low mineralised thermal mineral water. The water source is originally related to the deep Moc Chau-Tam Diep Fault directing northwest-southeastward. Its exploration reserve is estimated at 1,497 m3/d with good quality, sastifying all national criterals for the use of domestic supply, bathing, and medical treatment. This is one of ten rare thermal-mineral water sources in Vietnam, containing radon and radium. It is thefore necessary to have good management to ensure the thermal-mineral water to be effectively exploited, used, and protected.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 327--333
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    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:
    BIM competency in personnel recruitment in Vietnam construction enterprises
    Autorzy:
    Anh, Pham Xuan
    Toan, Nguyen Quoc
    Nam, Tran Phuong
    Long, Hoang Duy
    Thang, Do Duc
    Powiązania:
    https://bibliotekanauki.pl/articles/27312107.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    kompetencja
    modelowanie informacji o budynku
    BIM
    rekrutacja personelu
    personel
    firma budowlana
    Wietnam
    competency
    building information modelling
    personnel recruitment
    personnel
    construction company
    Vietnam
    Opis:
    The world has been implementing Building Information Modelling (BIM) successfully to construction projects from small to large scale. In Vietnam and many other countries, BIM is also widely applied in different fields of the construction industry. However, there are still many problems that need to be solved. One of those is to determine the necessary BIM competencies, thereby develop BIM personnel recruitment standards. The article identifies the competencies as well as evaluates their importance when supporting the recruitment of BIM personnel in construction enterprises in Vietnam. Through survey forms such as survey on online recruitment, expert interviews, and survey forms, the study is conducted with Likert scale, relative importance index (RII) for result analysis and ranking the importance of BIM competency for three distinct group of positions in Vietnam. With this result, the authors hope that the study will be an important reference, contributing to the development and concretization of the required competency criteria in the recruitment of BIM personnel in Vietnam and other similar countries.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 2; 381--397
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stabilization of Deep Roadways in Weak Rocks Using the System of Two-level Rock Bolts
    Autorzy:
    Tran, Tuan Minh
    Do, Ngoc Thai
    Dang, Trung Thanh
    Nguyen, Duyen Phong
    Vo, Trong Hung
    Powiązania:
    https://bibliotekanauki.pl/articles/2019328.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    deep roadways
    large deformation mechanism
    control techniques
    numerical simulation
    weak rocks
    rock bolts
    odkształcenia
    symulacja numeryczna
    kotwie górnicze
    Opis:
    Large rock mass deformation around deep roadways in the weak rocks was a significant problem in mining activities in Vietnam and other countries. The excavation of roadways leads to high releasing stress, which exceeds the peak strength of spalling surrounding rock and causes it to enter the post-failure stage. Tensile failures then initiate and develop around the roadways, which causes the fragmentation, dilation, and separation of surrounding rock. The capacity of the primary support system is low, which results in a severe contraction in the whole section of roadways, which requires finding solutions to prevent the deformation of rock mass around roadways and technical solutions from stabilizing for deep roadways. To stability analysis of roadways can be applied analytical, experimental, semi-experimental, and numerical methods. This paper introduces the prevention mechanism of large deformation of rock mass around roadways using 2-level rock bolts. The research results show that using the system of two-level rock bolts can reduce the values of tensile stress on the boundary of roadways range from 10 to 15% compared with only one. The importance of the total displacement of rock mass on the boundary of roadways will be reduced from 3.47 to 13.85% using six long cable bolts.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 157--166
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Mesoscopic Lattice Numerical Investigation of Increase of Chloride Diffusivity Coefficient during Uniaxial Loading Model
    Eksperymentalne i mezoskopowe badanie numeryczne sieci krystalicznej wzrostu współczynnika dyfuzyjności chlorków podczas jednoosiowego modelu obciążenia
    Autorzy:
    Bui, Truong Son
    Pham, Duc Tho
    Tran, The Truyen
    Nguyen, Thi Nu
    Vu, Minh Ngoc
    Powiązania:
    https://bibliotekanauki.pl/articles/317898.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    lattice model
    durability of concrete
    coastal regions
    chloride diffusion
    model kratowy
    trwałość betonu w regionach nadmorskich
    dyfuzja chlorków
    Opis:
    This paper presents experimental and simulation results of the change in the chloride diffusion coefficient of concrete C40 (f’c=40 MPa) during axial loading. Test Method for Electrical Indication was used to measure the chloride diffusivity of the concrete sample during the axial loading. A mesoscopic lattice model is proposed to describe the variation of chloride diffusion coefficient versus damage variable. In such a model, the domain of material is discretized randomly by using Voronoi tessellation for the transport element and Delaunay triangulation for a mechanical element. At the mesoscale, the concrete is constituted by three phases: aggregate, cement paste and ITZ, in which aggregate is assumed to be elastic while cement matrix and ITZ are represented by a damage model with softening. The experimental and numerical results show that in the first stage, without crack (s < 40%smax), the chloride diffusion coefficient remains almost constant, however in the crack initiation and propagation stage (s = 60-80%smax) chloride diffusion coefficient increases significantly. An empirical power model is also proposed to describe the increase of the chloride diffusion coefficient versus stress level and damage variable.
    W artykule przedstawiono wyniki doświadczalne i symulacyjne zmiany współczynnika dyfuzji chlorków betonu C40 (f’c = 40 MPa) podczas obciążenia osiowego. Do pomiaru dyfuzyjności chlorków próbki betonu podczas obciążenia osiowego wykorzystano metodę badania wskazań elektrycznych. Zaproponowano mezoskopowy model sieci krystalicznej w celu opisania zmiany współczynnika dyfuzji chlorków w funkcji zmiennej uszkodzenia. W takim modelu domena materiału jest dyskretyzowana losowo przy użyciu teselacji Voronoia dla elementu transportowego i triangulacji Delaunaya dla elementu mechanicznego. W mezoskali beton składa się z trzech faz: kruszywa, zaczynu cementowego i ITZ, w których zakłada się, że kruszywo jest elastyczne, natomiast osnowa cementowa i ITZ są reprezentowane przez model uszkodzenia ze zmiękczeniem. Wyniki eksperymentalne i numeryczne pokazują, że w pierwszym etapie, bez pęknięcia ((σ<40%σmax), współczynnik dyfuzji chlorków pozostaje prawie stały, natomiast w fazie inicjacji i propagacji pęknięcia (σ=60-80% σmax) współczynnik dyfuzji chlorków znacznie wzrasta. Zaproponowano również empiryczny model mocy opisujący wzrost współczynnika dyfuzji chlorków w funkcji poziomu naprężenia i zmiennej uszkodzenia.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 23-30
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Input Use Efficiency in Operational and Maintenance Management of Small-Pumping Scale Irrigation Systems in Red River Delta, Vietnam
    Autorzy:
    Dinh, Dao Van
    Nguyen, Phong Tung
    Tran, Dat Van
    Mukheibir, Pierre
    Ton, Au Nu Hai
    Powiązania:
    https://bibliotekanauki.pl/articles/2086427.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    technical efficiency
    scale efficiency
    irrigation system
    DEA
    data envelopment analysis
    Opis:
    In the Red River Delta (RRD) of Vietnam, small-pumping systems are one of main systems for paddy irrigation. It is imperative to analyze the operation and maintenance performance of irrigation systems by using the input factors when applying pricing mechanisms in the irrigation sector in Vietnam. In this study, based on the data of 48 irrigation systems managed by teams under irrigation companies, the non-parametric program, Data Envelopment Analysis, was used to measure the technical efficiency and scale efficiency for small-pumping scale irrigation systems in the Red River Delta. The seven input factors were the annual direct and indirect labor, materials, electricity, recurrent maintenance, overhead, and depreciation cost, and an output factor was the paddy areas irrigated by the systems. The results demonstrated that the average technical efficiency scores under constant returns to scale and variable returns to scale were 0.924 and 0.946, respectively. Thus, the wasted inputs were suggested to be 7.6% and 5.4% of the current input level, respectively. The average scale efficiency score was 0.977 and therefore, some 72.9% of the Decision-Making Units should adjust their input scales to achieve the efficiency in input factors.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 5; 207--215
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Industry 4.0, lean management and organizational support : a case of supply chain operations
    Przemysł 4.0, lean management i wsparcie organizacyjne : przypadek operacji łańcucha dostaw
    Autorzy:
    Tiep, Nguyen Cong
    Oanh, Thai Thi Kim
    Thuan, Tran Duc
    Tien, Dinh Van
    Ha, Thai Van
    Powiązania:
    https://bibliotekanauki.pl/articles/1826128.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    supply chain operations reference model
    Industry 4.0
    lean management
    organizational support
    model odniesienia operacji łańcucha dostaw
    Przemysł 4.0
    szczupłe zarządzanie
    wsparcie organizacyjne
    Opis:
    Currently, Industry 4.0 is considered as the essential improvement of business processes that could improve the lean management along with high organizational support and effective supply chain practices. Thus, the aim linked with the current article is to examine the role of Industry 4.0 in the business processes and its impact on lean management. The purpose also includes the investigation of mediation impact of supply chain operations reference model (SCORM) among the nexus of the role of Industry 4.0 in business process and lean management along with the examination of moderating role of organizational support among the nexus of SCORM and lean management. The researchers and questionnaires have selected the quantitative method of data collection have been used to gather the data from the respondents, while smart-PLS has been executed for analysis purpose. The results revealed that positive association had been found among the nexus of the role of Industry 4.0 in the business processes and lean management. The results also exposed that SCORM is positively mediating among the nexus of the role of Industry 4.0 in the business processes and lean management while organizational support positive moderated among the nexus of SCORM and lean management. These findings provided the guidelines to the policymakers that they should enhance their focus on the implementation of Industry 4.0 in the organization that could lead the organization towards success.
    Obecnie Przemysł 4.0 uważany jest za zasadnicze usprawnienie procesów biznesowych, które mogłoby usprawnić szczupłe zarządzanie przy jednoczesnym wysokim wsparciu organizacyjnym i efektywnych praktykach łańcucha dostaw. Zatem celem związanym z niniejszym artykułem jest zbadanie roli Przemysłu 4.0 w procesach biznesowych i jego wpływu na lean management. Celem jest również zbadanie wpływu mediacyjnego modelu referencyjnego operacji łańcucha dostaw (SCORM) na splot roli Przemysłu 4.0 w procesach biznesowych i szczupłym zarządzaniu, wraz z badaniem moderującej roli wsparcia organizacyjnego w powiązaniu SCORM i lean zarządzanie. Badacze i kwestionariusze wybrali ilościową metodę zbierania danych, która została wykorzystana do zebrania danych od respondentów, natomiast smart-PLS został wykonany do analizy. Wyniki ujawniły, że pozytywny związek został znaleziony wśród splotu roli Przemysłu 4.0 w procesach biznesowych i szczupłym zarządzaniu. Wyniki pokazały również, że SCORM pozytywnie pośredniczy w powiązaniu roli Przemysłu 4.0 w procesach biznesowych i szczupłym zarządzaniu, podczas gdy wsparcie organizacyjne jest moderowane pozytywnie wśród powiązań SCORM i lean management. Ustalenia te dostarczyły wskazówek dla decydentów, że powinni oni skupić się na wdrażaniu Przemysłu 4.0 w organizacji, która może poprowadzić organizację do sukcesu.
    Źródło:
    Polish Journal of Management Studies; 2020, 22, 1; 583-594
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    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 Root Development Response of Napier Grass to Drought Stress
    Autorzy:
    Nguyen, Loc Van
    Tran, Ngoc Minh Thi
    Nguyen, Long Viet
    Phan, Hong Nhung Thi
    Rumanzi, Mbaraka Saidi
    Pham, Cuong Van
    Tang, Hanh Thi
    Powiązania:
    https://bibliotekanauki.pl/articles/1955525.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    drought level
    Napier grass
    root response
    root length
    Opis:
    Global climate change and increasing agricultural activity are the main causes of biotic and abiotic stresses, which negatively affect the plant growth and crop yields. The plant root system is the first organ for sensing the soil moisture limitation; therefore root growth under elevated water deficit is an important indicator for plant’s drought tolerance. Although the previous studies focused on the morphological traits of Napier grasses under water stresses, the root growth changes due to drought levels remain largely unclear. In order to evaluate variation in root performance to respond to drought stress, four cultivars named "Cỏ voi thuần" (CVT), King grass, Packchong, and VA06 were grown for 10 days under drought conditions under polyethylene glycol 6000 (PEG6000): 0% PEG6000 as control, 5% PEG6000, 10% PEG6000, 15% PEG6000 and 20% PEG6000. As compared to control, the root growth of all cultivars was reduced under drought treatments; however, significant variation in the root development response to drought levels was found. Among Napier cultivars, "Cỏ voi thuần" expressed drought-tolerant genotypes. The information on the root length, diameter, surface area and volume of the cultivars reveals interesting guidelines for further studies to explore the mechanisms behind root adaptation of Napier grasses to drought.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 8; 64-74
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    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:
    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:
    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:
    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:
    Current situation of Bitcoin management and use: perspectives from the world and recommendations for Vietnam
    Autorzy:
    Hang, Bui Thi Thu
    Huy, Dinh Tran Ngoc
    An, Phan Thuy
    Ngoc, Nguyen Thi Bich
    Duyen, Huynh Thi My
    Powiązania:
    https://bibliotekanauki.pl/articles/1818368.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    Bitcoin
    virtual currency
    cryptocurrencies
    Vietnam
    waluta wirtualna
    kryptowaluty
    Wietnam
    Opis:
    The research aimed to evaluate suitability of Bitcoin and its platform in emerging markets such as Vietnam. We used qualitative analysis combined with data collection method published, statistics, analysis, synthesis, comparison, to generate qualitative comments and discussion; evaluate results, the article analyzed and evaluated the impacts of Bitcoin and virtual currency on society of Vietnam, both positive and negative sides. It was found that virtual currency not accepted in Vietnam as means of payment yet, while many nations in the world accept it. We need to complete the legal framework for virtual currencies in general, Bitcoin in particular. The State should continue to have policies to improve information technology infrastructure, build and improve the capacity of the contingent of financial experts, encryption, and security experts and give warning risks in virtual currency transactions. The scientific value of paper is using experiences from previous studies in other countries to generate recommendations for conditions of Bitcoin development in merging markets. Last but not least, the research was limited to the case of Vietnam; hence, we can expand research to other Asian countries or other emerging markets.
    Źródło:
    Management; 2020, 24, 2; 209-235
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    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:
    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:
    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:
    Phytochemical composition and antibacterial activity of ethanolic extract from trunk of Rothmannia wittii (Craib) Bremek. (Rubiaceae) newly found in Vietnam
    Autorzy:
    Van, H.T.
    Nguyen, T.T.
    Ton, H.T.T.
    Dinh, K.T.T.
    Le, V.S.
    Pham, T.V.
    Tran, G.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2096309.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Rothmannia wittii
    extract
    phytochemical composition
    antibacterial activity
    LC-MS
    Opis:
    Rothmannia wittii, which is found in Binh Chau-Phuoc Buu Nature Reserve, Bung Rieng ward, Xuyen Moc District, Ba Ria-Vung Tau Province, Vietnam, is a rare species of Rubiaceae family. The present study aimed to determine the phytochemical composition and antimicrobial activity of the ethanolic extract of the R. wittii trunk. A total of 10 compounds were identified by liquid chromatography-mass spectrophotometry (LC-MS), including 1) benzene, 1-(1,5-dimethyl-4- hexenyl)-4-methyl, 2) diphenylsulfone, 3) 6β-hydroxy-10-O-acetylgenipin, 4) cinnamyl-cinnamate, 5) genipin, 6) megastigmatrienone, 7) ethyl p-methoxy-trans-cinnamate, 8) rothalazepane, 9) 1,3,6-trimethylpyrano[2,3-d ]imidazole-2,5(1H,3H)-dione, and 10) shanzhiol. The extract also exhibited an antibacterial activity against six bacterial strains: Bacillus cereus, Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, Salmonella typhimurium and Salmonella enteritidis, as determined via disk diffusion agar method.
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 4; 301-307
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-87 z 87

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies