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Wyszukujesz frazę "Nguyen Duc, Trung" wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Study on some solutions for enlarging the application scope of the fully mechanized longwall coal mining technology according to seam dip angle at underground coal mines in Quang Ninh coalfield
    Badanie kompleksowych rozwiązań w celu rozszerzenia zakresu zastosowania w pełni zmechanizowanej technologii eksploatacji węgla ścianowego zgodnie z kątem upadu pokładu w podziemnych kopalniach węgla w zagłębiu węglowym Quang Ninh
    Autorzy:
    Nguyen Duc, Trung
    Korzeniowski, Waldemar
    Skrzypkowski, Krzysztof
    Pham Trung, Nguyen
    Powiązania:
    https://bibliotekanauki.pl/articles/318816.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    eksploatacja
    węgiel
    podziemne kopalnie węgla
    exploitation
    coal
    underground coal mines
    Opis:
    The paper summarizes the applied experience, the technical solutions to limit the adverse effects of slope angle in the mechanized longwall mining at underground mines in the world. The paper proposes some solutions for enlarging the application field of the fully mechanized longwall mining technology according to seam dip angle at underground coal mines belonging to Vinacomin. In the article exploitation methods of coal seams of medium to thick thickness with dip angle above 20° designed for mechanized longwall were presented.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 2/2; 28-35
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Choice of powered roof support FAZOS-15/31-POz for Vang Danh hard coal mine
    Dobór obudowy zmechanizowanej typu FAZOS-15/31-POz dla podziemnej kopalni węgla kamiennego Vang Danh
    Autorzy:
    Skrzypkowski, Krzysztof
    Korzeniowski, Waldemar
    Duc, Trung Nguyen
    Powiązania:
    https://bibliotekanauki.pl/articles/318927.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    kopalnia podziemna
    Wietnam
    obudowa zmechanizowana
    underground hard coal mines
    Vietnam
    powered roof support
    Opis:
    The article presents the choice of a Polish powered roof support from FAMUR Group for the conditions of one of the hard coal mines in Vietnam. In the analytical calculations, the strength and structural parameters of the rock mass from the Vang Danh mine region were adopted. The longwall face is 93 m long and the thickness of the coal layer is equal 3 m. For the needs of the choice of support, the load of the longwall face determined and the capacity of the powered roof support were determined. On the basis of the permissible roof deflection method, the condition of excavation maintenance was characterized. In the calculations, it was assumed that the condition of using a powered roof support type FAZOS-15/31-POz, except in addition to complying of the working range and permissible value of longwall face inclination, is to ensure proper roof maintenance conditions, which are determined by the index of load capacity of the roof „g”.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 2/2; 175-182
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-objective optimization of the cylindrical grinding process of SCM440 steel using preference selection index method
    Autorzy:
    Tien, Dung Hoang
    Trung, Do Duc
    Thien, Nguyen Van
    Nguyen, Nhu-Tung
    Powiązania:
    https://bibliotekanauki.pl/articles/1833757.pdf
    Data publikacji:
    2021
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    MRR
    Taguchi PSI method
    surface roughness
    cylindrical grinding process
    Opis:
    This paper presents a study to ensure the minimum values of Ra and Rz, and the maximum value of MRR when external cylindrical grinding by the PSI method. The experiments were performed according to the orthogonal Taguchi L9 matrix with the input parameters including workpiece speed, feed rate, and depth of cut in the conventional grinding machine. Analysis of experimental results by Pareto chart showed that the feed rate and the depth of cut most influence on Ra and Rz, respectively. Feed rate and depth of cut all have a great influence on MRR. Meanwhile, the workpiece speed has a negligible effect on all three output parameters. The research results showed that to obtain the minimum values of Ra and Rz, and maximum of MRR, the workpiece speed, feed rate, and depth of cut were 400 rev/min 37.7 mm/min, 0.09 mm/rev, and 0.02 mm, respectively.
    Źródło:
    Journal of Machine Engineering; 2021, 21, 3; 110--123
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Impact of Digital Leadership on Organizational Performance: A Study in Vietnams coal Mining Companies
    Autorzy:
    Le, Van Chien
    Nguyen, Duc Thang
    Pham, Kien Trung
    Nguyen, Thi Hoai Nga
    Powiązania:
    https://bibliotekanauki.pl/articles/27323234.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    digital transformation
    digital leadership
    digital transformation strategy
    digital skills
    organization performance
    coal mining company
    transformacja cyfrowa
    strategia
    górnictwo
    Opis:
    Under the influence of the 4th industrial revolution and the impact of the Covid-19 pandemic, digital transformation is rapidly taking place in all aspects of society. For businesses, digital transformation is an essential and objective trend for their sustainability and development. The purpose of digital transformation for businesses is to enhance operational efficiency through factors such as accelerating market speed, gaining competitive advantage, driving revenue growth, increasing labor productivity, and expanding customer attraction and retention. Numerous studies have indicated that the process of digital transformation in businesses is influenced by leadership and digital transformation strategies, and digital transformation has an impact on business performance. This study aims to identify the relationship between digital leadership and the operational efficiency of coal mining companies in Vietnam, with the mediating role of digital transformation strategies. Additionally, the study examines the moderating role of digital skills on the relationship between digital transformation strategies and the operational efficiency of the organizations. The research surveyed 111 employees and workers currently working in coal mining companies in Vietnam. Through analysis and hypothesis testing, the results showed that digital leadership does not have a direct impact on coal companies’ operational efficiency. However, it indirectly affects business performance through the mediating role of digital transformation strategies. The study's findings also revealed that the digital skills of employees play a moderating role in enhancing the relationship between digital transformation strategies and the operational efficiency of the organization.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 121--130
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isolation of citronellal and geraniol from citronella (Cymbopogon winterianus) oil by vacuum fractional distillation: Effect of operating conditions on the separation
    Autorzy:
    Le, Minh-Trung
    Vu, Duc-Phuong
    Nguyen, Thanh Ngoc
    Le, Xuan-Tien
    Powiązania:
    https://bibliotekanauki.pl/articles/27315670.pdf
    Data publikacji:
    2023
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    citronellal
    geraniol
    vacuum
    fractional distillation
    citronella oil
    Opis:
    This study used fractional distillation to separate citronellal and geraniol from citronella (Cymbopogon winterianus) essential oil to improve their market value. The one-factor-at-a-time methodology investigated operating parameters’ optimum conditions and effects, including system pressure, packing types, and column height. All investigations were evaluated based on their main fraction’s citronellal and geraniol content and recovery. Regarding the effect of the variables, a higher system pressure improved the separation while increasing the temperature range of each fraction and distillation time. The packing types would also improve the separation by providing a large surface area. Finally, the column height also positively impacted the separation. In the optimum citronella oil fractionation, citronellal content experienced a 2.5-fold increase, from 37.68% to 94.33%. Geraniol purity reached 40.61% from an initial content of 17.33% in the raw CW oil. The distillation could recover up to 90.00% of citronellal and 68.18% of geraniol.
    Źródło:
    Polish Journal of Chemical Technology; 2023, 25, 4; 67--80
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancing Workplace Safety: A Comprehensive Action Plan for Duong Huy Coal Company (2021– 2025)
    Autorzy:
    Nguyen, Thi Hoai Nga
    Nguyen, Duc Thang
    Le, Dinh Chieu
    Le, Van Chien
    Pham, Kien Trung
    Powiązania:
    https://bibliotekanauki.pl/articles/27323288.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    workplace safety
    safety standards
    safety solutions
    extractive industries
    Duong Huy coal company
    bezpieczeństwo i higiena pracy
    Wietnam
    przemysł
    Opis:
    Workplace safety is of paramount importance in industries such as coal mining, where accidents and occupational illnesses can result in significant human and economic costs. This study aims to develop an action plan to improve safety standards at Duong Huy Coal Company from 2021 to 2025. A comprehensive survey involving 93 safety managers and 379 workers from various production sites was researched to gather insights and opinions on safety priorities. Focus group discussions and expert consultations were employed to assess the current safety situation, identify challenges, and develop coherent safety solutions. Based on the survey results, the proposed action plan focuses on the following objectives: reducing workplace accidents by 20-25% annually, progressing towards zero accidents in the following years, and increasing productivity and benefits for both workers and the company. The plan also emphasizes the role of company leadership in widely communicating their commitment to safety and the need for individual units within the company to proactively plan, budget, and implement safety measures following their functions and responsibilities. Collaboration with relevant state agencies, mass mobilization campaigns, and the application of science and technology in safety and occupational health will further contribute to the enhancement of workplace safety at Duong Huy Coal Company.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 205--208
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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