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    Wyświetlanie 1-8 z 8
    Tytuł:
    Numerical Study on Effects of Airflow Parameters on the Air Temperature the at Mechanized Longwall of Mongduong Coal Mine
    Autorzy:
    Nguyen, Hong Thi
    Nguyen, Quang Van
    Powiązania:
    https://bibliotekanauki.pl/articles/27323262.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    numerical modelling
    Ansys CFX
    mechanized longwall
    temperature of air mine
    velocity of air mine
    Mongduong coal mine
    modelowanie numeryczne
    temperatura
    powietrze kopalniane
    Wietnam
    Opis:
    The increasing depth of extraction and the degree of mechanization leading to the risk of workers working in poor microclimate conditions has become one of the major safety issues in coal mines. During the survey of the current microclimate in Mongduong coal mine, it showed that the temperature of the mechanized longwall exceeded the permissible regulations (t°≤ 30°C), the air humidity is about 95–100%. The reason for the increase of air temperature in longwall is due to geothermal, heat radiated from the longwall equipment and the inlet wind high temperature. To improve the thermal environment in the mechanized longwall area, Vietnam's coal mines open use ventilation, but the efficiency is not high. Therefore, the paper evaluated the influence of airflow on the temperature of the longwall, 7 models with different air flow velocities and 3 models with inlet air temperature have been created in ICM-CFD and simulated by Ansys CFX software. The environment temperature of each model was evaluated by analyzing the average temperature of the roadway section, the cross-section distribution of the roadway temperature and the velocity streamline of the whole roadway. As a result, the air flow rate increases leading to the air temperature in the longwall decreases, however the wind speed is limited. The inlet temperature of the gas stream is an important factor that affects the thermal environment in the longwall. The results of the article are the basis for making solutions to improve the thermal environment suitable for high-temperature longwall.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 89--96
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Protection of Female Workers rights in Employment and Incomes in Vietnam
    Autorzy:
    Nguyen, Thi Hong Loan
    Pham, Thu Trang
    Nguyen, Thi Ngoc Anh
    Bui, Thi Thu Thuy
    Nguyen, Hong Thai
    Powiązania:
    https://bibliotekanauki.pl/articles/2020248.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    rights of female worker
    employment and income
    Labor Law
    Covid-19 epidemic
    praca kobiet
    prawo pracy
    Wietnam
    Covid-19
    Opis:
    As an important task of the country's socio-economic development, protecting the rights of female workers in employment and income is concerned and implemented by international organizations and all countries in the world. The COVID-19 pandemic has been affecting the global economy and hurt the incomes and employment of many female workers. In Vietnam nowadays, there is an increase in the unemployment rate of female workers, gender inequality in employment and income, and the ability to secure their jobs and income. The article analyzes the current regulations and their implementation in the employment and income of Vietnamese female workers in the context of the COVID-19 pandemic. The article also proposes some recommendations on legal provisions related to training backup jobs, arranging and employing female employees, providing income support for female employees during leave due to the COVID-19 epidemic; and policies related to female workers and their employers. These recommendations will improve Vietnam's labor law on female workers’ rights in employment and income and enhance the efficiency of human resource use and socio-economic development.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 505--512
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Power Quality on the Performance of Explosion-Proof Transformers in Mining in Vietnam
    Autorzy:
    Do, Nhu Y.
    Ngo, Xuan Cuong
    Nguyen, Thi Hong
    Powiązania:
    https://bibliotekanauki.pl/articles/25212166.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    power quality
    performance
    explosion-proof transformer
    fuzzy system
    górnictwo
    jakość energii
    Wietnam
    Opis:
    When meeting customer demand, utility companies must consider power quality. Currently, the industrial power network in general and the underground mine power network in particular have long feeder lines, supplying power to many nonlinear loads and power electronic converters, which reduces power quality. Poor power quality can damage sensitive equipment and lead to costly repairs, leading to lost time, data corruption, and lower productivity. In this paper, a fuzzy system is developed to determine the power quality of the power network for different operating conditions and study its influence on the performance of the explosion-proof transformer in the underground mine power network in Vietnam. The simulations and calculations were performed on Matlab-Simulink software for a three-phase, 630-kVA, 6/1.2 kV explosion-proof transformer in power networks with variable power quality. A fuzzy system is developed with four measurable inputs, including frequency deviation, voltage unbalance factor, total harmonic distortion of supply voltage, total harmonic distortion of current, and an output variable, power quality. The simulation results show that the explosion-proof transformer's performance decreases when the power quality degrades, and the proposed fuzzy system can accurately diagnose this.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 61--69
    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:
    Integration of Mobile and Meb GIS Technologies to Promote Smart and Sustainable Tourism in Vietnam
    Autorzy:
    Nguyen, Mai Dung
    To, Xuan Ban
    Le, Hong Anh
    Powiązania:
    https://bibliotekanauki.pl/articles/27323289.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    mobile GIS
    WebGIS
    location-based services
    smart and sustainable tourism
    GIS
    turystyka
    Wietnam
    Opis:
    Tourism is one of the most important factors in economic growth in Vietnam. However, it requires the balance between economics, social-cultures, and ecology because of their big impacts. In this paper, we propose a platform with mobile and web-based applications that can support smart and sustainable tourism in Vietnam for both local governments and visitors. The mobile application allows visitors to access location-based services to explore the visiting area, such as finding nearby natural attractions, as well as information to minimize the negative effects of tourism on the environment and the local community. It also enables users to report negative impacts to local government. The web application allows local authorities to monitor the status and trends of the habitant, natural environment, tourism infrastructure and activities in the area. The system uses geographic information systems (GIS) and remote sensing techniques to collect, analye and visualize various indicators of sustainability. The platform is developed with open-source technologies such as NodeJS, PostgreSQL, and Flutter. The paper demonstrates the feasibility and usefulness of the proposed platform through case studies in Hoa Binh and BacKan, two provinces have many attractive natural sites.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 225--230
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developing Criteria for Assessing The Stability of Water Supply Models in High Mountains and Water-Scare Areas
    Autorzy:
    Nguyen, Manh Truong
    Dinh, Anh Tuan
    Nguyen, Tiep Tan
    Vu, Thi Hong Nghia
    Do, Van Binh
    Powiązania:
    https://bibliotekanauki.pl/articles/27323245.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    criteria
    water supply
    high mountain
    Vietnam
    kryteria
    Wietnam
    woda
    Opis:
    The article presents the scientific basis for assessing the stability of water supply models and develops a suitable set of criteria to assess the stability of water supply works, which includes the water supply part for water supply works and systems (including headworks and water distribution systems) in high mountains and water-scarce areas in Vietnam. Research results indicate that in order to improve the stability and availability of water of the models that have been, are and will be built, it is necessary to have a common method of evaluating effectiveness for scientific models of domestic water supply. Accordingly, it is necessary to build obtain a suitable set of criteria to assess the stability of the water supply model (source + water supply works) in the high mountains, water-scarce areas in Vietnam.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 179--186
    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:
    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
      Wyświetlanie 1-8 z 8

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