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    Wyświetlanie 1-11 z 11
    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:
    Promoting Gender Equality and Awareness in the Vietnamese Mining Sector: Perceptions, Challenges, and Policy Recommendations
    Autorzy:
    Pham, Minh Hang
    Pham, Thi Luong
    Nguyen, Thi Hoai Nga
    Pham, Kien Trung
    Powiązania:
    https://bibliotekanauki.pl/articles/27323284.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    gender equality
    gender knowledge
    gender perspective
    extractive industries
    mining sector
    płeć
    zatrudnienie
    górnictwo
    Wietnam
    Opis:
    Females in the industry nowadays have been offered many opportunities to develop their careers. However, the chances are not the same in different areas or sectors. This study investigated the perceptions and understanding of gender-related issues in the mining sector among potential young workers and industry experts in Vietnam. The study employs Oxfam's Gender Impact Assessment Guidelines for extractive industries and the Convention on the Elimination of All Forms of Discrimination Against Women - CEDAW's Women's Economic and Social Rights Framework to assess gender-related issues in the mining sector. A survey of 207 students in Hanoi was conducted, besides focus group discussions and in-depth interviews with gender and mining experts. Findings reveal significant differences in knowledge and awareness of gender issues between students, emphasizing the need to integrate gender knowledge into specialized fields such as mining. In addition, professionals working solely in the mining sector demonstrated a lack of sensitivity to gender issues. Consequently, the study recommends capacity building, seminars, and exchanges to help mining professionals incorporate a gender perspective into their activities. Current policies exhibit gender neutrality, indirectly excluding women's participation and compromising men's safety in the mining sector. The study proposes policy recommendations for enhancing the protection of workers in the mining industry and promoting gender equality. These include incorporating gender perspectives into relevant laws, raising awareness of gender issues among policymakers and professionals, and increasing the mining sector's presence in the media to encourage youth to pursue careers in this field.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 235--238
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research and Solution Proposals to Optimize Distribution Power Grids in Smart Grid Condition
    Autorzy:
    Pham, Trung Son
    Nguyen, Dinh Tien
    Nguyen, Quang Thuan
    Dang, Quang Khoa
    Powiązania:
    https://bibliotekanauki.pl/articles/2020237.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    smart grid
    power loss
    energy loss
    optimization
    distribution power grids
    strata energii
    optymizacja
    dystrybucja
    Opis:
    Smart Grid is a concept for transforming the electric power grid by using advanced automatic control and communications techniques and other forms of information technology. It integrates innovative tools and technologies from: generation, transmission and distribution. This also includes consumer appliances and equipment. This concept integrates energy infrastructure, processes, devices, information and markets into a coordinated and collaborative process. All allowing energy to be generated, distributed and consumed flexibly and efficiently. However, the Smart Grid with the integration of distributed generation itself also creates a several disadvantages. There can be problems with: stability and reliability, relay protection, isolation and operational isolation in which the problem is to create a burden on the distribution grid when transmitting electrical energy sources. Optimizing power flow and bringing high operating efficiency on Smart Grid conditions is an urgent issue. This paper focuses on researching and proposing solutions for optimal calculation of power flow on Smart Grid. The paper has researched, and analyzed calculation solutions to optimize power flow and proposed to use the Lagrange multiplier method. The study performed calculations for a typical Smart Grid model with three distributed generations. Calculation results have shown that the role of the method is to fully perform the optimal calculation of the power flow on the grid. This is in order to reduce power loss and energy loss as well as increasing operational efficiency while improving power quality in Smart Grid conditions.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 479--486
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    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:
    The capability of terrestrial laser scanning for monitoring the displacement of high-rise buildings
    Autorzy:
    Pham, Trung Dung
    Pham, Quoc Khanh
    Cao, Xuan Cuong
    Nguyen, Viet Hung
    Ngo, Sy Cuong
    Powiązania:
    https://bibliotekanauki.pl/articles/2020241.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    terrestrial laser scanner
    monitoring of displacements
    accuracy of displacement
    high-rise buildings
    skaner laserowy naziemny
    modelowanie
    przemieszczenia
    Opis:
    Recently, terrestrial laser scanner (TLS) has been increasingly used to monitor of displacement of high-rise buildings. The main advantages of this technique are time-saving, higher point density, and higher accuracy in comparison with GPS and conventional methods. While TLS is ordinary worldwide, there has been no study of the capability of TLS in monitoring the displacement of high-rise buildings yet in Vietnam. The paper's goal is to build a procedure for displacement monitoring of high-rise buildings and assess the accuracy of TLS in this application. In the experiments, a scanned board with a 60 cm x 60 cm mounted on a moveable monument system is scanned by Faro Focus3D X130. A monitoring procedure using TLS is proposed, including three main stages: site investigation, data acquisition and processing, and displacement determination by the Cloud-to-Cloud method (C2C). As a result, the displacement of the scanned object between epochs is computed. In order to evaluate the accuracy, the estimated displacement using TLS is compared with the real displacement. The accuracy depends on scanning geometry, surface property, and point density conditions. Our results show that the accuracy of the estimated displacement is within ± 2 mm for buildings lower than 50 m of height. Thus, TLS completely meets the accuracy requirements of monitoring displacement in the Vietnam Standards of Engineering Surveying. With such outstanding performance, our workflow of using TLS could be applied to monitor the displacement of high-rise buildings in the reality of geodetic production in Vietnam.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 495--504
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancing Workplace Safety: A Comprehensive Action Plan for Duong Huy Coal Company (2021– 2025)
    Autorzy:
    Nguyen, Thi Hoai Nga
    Nguyen, Duc Thang
    Le, Dinh Chieu
    Le, Van Chien
    Pham, Kien Trung
    Powiązania:
    https://bibliotekanauki.pl/articles/27323288.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    workplace safety
    safety standards
    safety solutions
    extractive industries
    Duong Huy coal company
    bezpieczeństwo i higiena pracy
    Wietnam
    przemysł
    Opis:
    Workplace safety is of paramount importance in industries such as coal mining, where accidents and occupational illnesses can result in significant human and economic costs. This study aims to develop an action plan to improve safety standards at Duong Huy Coal Company from 2021 to 2025. A comprehensive survey involving 93 safety managers and 379 workers from various production sites was researched to gather insights and opinions on safety priorities. Focus group discussions and expert consultations were employed to assess the current safety situation, identify challenges, and develop coherent safety solutions. Based on the survey results, the proposed action plan focuses on the following objectives: reducing workplace accidents by 20-25% annually, progressing towards zero accidents in the following years, and increasing productivity and benefits for both workers and the company. The plan also emphasizes the role of company leadership in widely communicating their commitment to safety and the need for individual units within the company to proactively plan, budget, and implement safety measures following their functions and responsibilities. Collaboration with relevant state agencies, mass mobilization campaigns, and the application of science and technology in safety and occupational health will further contribute to the enhancement of workplace safety at Duong Huy Coal Company.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 205--208
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sediment discharge and storage over the last deglacial highstand period on the central Vietnam shelf off Nha Trang
    Autorzy:
    Dung, Bui Viet
    Stattegger, Karl
    Kieu, Nguyen Van
    Thanh, Nguyen Trung
    Thong, Bui Xuan
    Vu, Pham Nguyen Ha
    Man, Ha Quang
    Trang, Pham Hong
    Powiązania:
    https://bibliotekanauki.pl/articles/2058662.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    sediment budget
    Nha Trang shelf
    central Vietnam
    Holocene highstand
    sequence stratigraphy
    Opis:
    A sediment budget for the central Vietnam shelf off Nha Trang over the last deglacial Holocene highstand period has been investigated on the basis of shallow seismic and sediment core data and empirical equations. The annual suspended sediment discharge to the Nha Trang shelf ranges from: 4.3 to 5.4 Mt/year. Estimates based on published empirical equations suggest that the sediment discharge by three main local mountainous rivers (the Cai, Dinh and Van Phong rivers) that enter the Nha Trang shelf ranges between 1.7 and 4 Mt/year, which implies that the local rivers discharge approximately 75% of the total annual sediment input to the shelf. The annual sediment supply of the Cai River is approximately 2 and 6 times higher than that of the Dinh and Van Phong rivers, respectively. The highstand sediment depocentre of the Nha Trang shelf is mostly attached to the local river outflows, indicating their importance as the principal sediment supply sources to the shelf. Additional sources of sediment supply to the Nha Trang shelf can probably be related to along-shore transport from the nearby shelves. Calculations based on seismic and sediment core data indicate that the net sediment volume storage on the Nha Trang shelf is approximately 2.15 Mt/year. Approximately 50% of the total sediment yield supplied to the shelf is probably transported along-shore to the south. The sediment budget model for highstand deposits on the Nha Trang shelf is typical for a small mountainous river basin, which is significantly different from that of the large river delta systems in Vietnam such as the Mekong and Red rivers where 90% of the river sediments are captured on the delta plain/subaqueous part and only 10% of the river sediments are transported to the nearby shelf. In contrast, most of the sediments supplied by small mountainous rivers off Nha Trang are transported to the mid-shelf, forming a shore-parallel mud depocentre.
    Źródło:
    Geological Quarterly; 2019, 63, 2; 395--406
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid end-to-end approach integrating online learning with face-identification system
    Autorzy:
    Nguyene, Dat Van
    Nguyen, Son Trung
    Pham, Thi Hong Anh
    Pham, Van Toan
    Hoang, Thao Thu
    Thanh, Ta Minh
    Powiązania:
    https://bibliotekanauki.pl/articles/27312886.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    facial recognition
    visual search engine
    end-to-end applications
    online learning
    ElasticSearch (ES)
    ES
    Opis:
    Facial recognition has been one of the most intriguing and exciting research topics over the last few years. It involves multiple face-based algorithms such asfacial detection, facial alignment, facial representation, and facial recognition. However, all of these algorithms are derived from large deep-learning architectures, leading to limitations in development, scalability, accuracy, and deployment for public use with mere CPU servers. Also, large data sets that contain hundreds of thousands of records are often required for training purposes. In this paper, we propose a complete pipeline for an effective face-recognition application that requires only a small data set of Vietnamese celebrities and a CPU for training, solving the problem of data leakage, and the need for GPU devices. The pipeline is based on the combination of a conversion algorithm from face vectors to string tokens and the indexing & retrieval process by Elasticsearch, thereby tackling the problem of online learning in facial recognition. Compared with other popular algorithms on the same data set, our proposed pipeline not only outperforms the counterpart in terms of accuracy but also delivers faster inference, which is essential to real-time applications.
    Źródło:
    Computer Science; 2023, 24 (1); 141--161
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Establishing the Vertical Movement Map of Cuu Long Delta River by GNSS Data
    Autorzy:
    Nguyen, Gia Trong
    Nguyen, Viet Nghia
    Ly, Lam Ha
    Vu, Trung Dung
    Nguyen, Quoc Long
    Kim, Thi Thu Huong
    Pham, Ngoc Quang
    Nguyen, Viet Quan
    Powiązania:
    https://bibliotekanauki.pl/articles/27323240.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    land subsidence
    GNSS
    vertical crustal deformation
    Mekong delta
    deformacje
    delta Mekongu
    Opis:
    Mekong Delta is an area with an important position in the socio-economic development of Vietnam. However, due to the impact of climate change as well as of the construction of hydroelectric dams in the upstream of the Mekong River in recent years, saline intrusion and flooding have been occurred because of high tide. According to published researches, the Mekong Delta is being experienced surface subsidence with a rate of up to centimeters per year, that exacerbates the impact of saline intrusion and flooding. Thus, studying to establish the surface subsidence map is an urgent need in this site. There are many of technologies to create the vertical movement map such as: Levelling, INSAR, GNSS, etc. Up to now, there are no scientific reports on the application of GNSS to monitor the vertical movement in this area. In this paper, the authors have calculated the largest vertical displacement velocity up to 3cm/year based on processing GNSS observations of nearly 20 GNSS monitoring station in the area using Bernese software. From these results, the research team has made the vertical movement map of Mekong, Vietnam.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 173--177
    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
    Tytuł:
    Effects of social marketing on attitudes and behavior related to road traffic in Hanoi city
    Autorzy:
    Nhung, Ngo Thi Hong
    Hai, Do Huu
    Dung, Vu Tri
    Thong, Le Ngoc
    Trung, Pham Quang
    Cuong, Nguyen Hung
    Powiązania:
    https://bibliotekanauki.pl/articles/27314064.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    social marketing
    attitude
    behavior
    road traffic
    marketing społeczny
    postawa
    zachowanie
    ruch drogowy
    Opis:
    Dangerous and risky actions while traveling on traffic routes that threaten the health, spirit and life of vehicle drivers and others. However, to raise community awareness, make them care about traffic safety behavior takes time and influence attitudes to create behavior change in a sustainable way. Research based on Ajzen’s theory of planned behavior [1, 2] and the theory of social marketing was conducted to identify the factors influencing the road traffic attitudes and behaviors of people in Hanoi and the degrees of their influence. The results show that road traffic attitudes are affected, in descending order, by partnership, resources, distribution, promotion, price, product, and public. The road traffic behavior of people is determined, in descending order, by age, moderator variables (the law and the validity of the law and weather), attitude, and education level. Based on the results, several recommendations to government officials and policymakers have been made.
    Źródło:
    Transport Problems; 2023, 18, 1; 193--202
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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