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    Wyświetlanie 1-7 z 7
    Tytuł:
    Research, Calculation and Proposal of Ventilation Solution for Duong Huy Coal Mine when Mining Down to -250 m Depth
    Autorzy:
    Dao, Van Chi
    Le, Tien Dung
    Vu, Thai Tien Dung
    Nguyen, Hong Cuong
    Powiązania:
    https://bibliotekanauki.pl/articles/2020250.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    main fan
    working mode
    ventilation
    airflow
    air pressure
    air velocity
    wentylacja
    ciśnienie
    powietrze
    Opis:
    At present, according to the extraction plan in the year 2020 of Duong Huy Coal Company - Vinacomin, the mining is divided into three main zones: Central Zone extracts 06 faces; South Zone extracts 2 faces and Northeast Zone extracts 2 faces. The designated total production of all zones is 1,880,000 tons/year. To ensure the production of each mining zone, exhaust fan stations are installed at ventilation roadway adits with a total of 05 main fan stations. However, in the near future, to ensure and maintain production activities, the mine is being planned and operated using 03 main fan stations. The calculation results for the reasonable working mode of fan stations are as follows: for fan station FBCDZ8-№32B at level +47 m, airflow is 167.69 m3 /s and air pressure is 243.74 mm H2O; for fan station 2K56- №30 level +40 m, airflow is 123.37 m3 /s and air pressure is 324.79 mm H2O; for fan station FBCDZ-8- №32B at level +44 m, airflow is 167.69 m3 /s and air pressure is 354.99 mm H2O.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 513--520
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on optimizing spray parameters for Cr3C2 – NiCr coating created on alloy steel by plasma spraying technique
    Autorzy:
    Dang, Thao Xuan
    Son, Nguyen Hong
    Cuong, Pham Duc
    Powiązania:
    https://bibliotekanauki.pl/articles/2171770.pdf
    Data publikacji:
    2022
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    Cr3C2-NiCr
    plasma spraying
    coating
    optimization
    E355 alloy steel
    Opis:
    In this work, Cr3C2-NiCr ceramic coating with NiCr content of 30% was created on E355 (St 52-3)/1.0060 alloy steel substrate by air plasma thermal spraying (APS) method. The adhesion, tensile strength of the coating were studied in relation to spray parameters including current intensity, powder feed rate, and stand-off distance according to experimental planning. Experiments were designed based on Central Composite Design method. The adhesion and tensile strength of the coatings were measured by a tensile-compression machine. Analysis of variance (ANOVA) were used to build regression functions expressing the relationship between each property and spray parameters. The experimental results showed that those spray parameters significantly influence the properties of the coating. ANOVA results indicated that the spray parameters have different influences for each coating properties. In addition, regression model of the properties gives prediction results very close to experimental results. The optimization problem was solved in order to achieve the maximum value of adhesion and tensile strength of the coating. Values of the spray parameters for Cr3C2 – NiCr coating to achieve the above criteria have been determined and proposed in this study.
    Źródło:
    Journal of Machine Engineering; 2022, 22, 4; 43--53
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    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:
    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:
    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:
    Effects of social marketing on attitudes and behavior related to road traffic in Hanoi city
    Autorzy:
    Nhung, Ngo Thi Hong
    Hai, Do Huu
    Dung, Vu Tri
    Thong, Le Ngoc
    Trung, Pham Quang
    Cuong, Nguyen Hung
    Powiązania:
    https://bibliotekanauki.pl/articles/27314064.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    social marketing
    attitude
    behavior
    road traffic
    marketing społeczny
    postawa
    zachowanie
    ruch drogowy
    Opis:
    Dangerous and risky actions while traveling on traffic routes that threaten the health, spirit and life of vehicle drivers and others. However, to raise community awareness, make them care about traffic safety behavior takes time and influence attitudes to create behavior change in a sustainable way. Research based on Ajzen’s theory of planned behavior [1, 2] and the theory of social marketing was conducted to identify the factors influencing the road traffic attitudes and behaviors of people in Hanoi and the degrees of their influence. The results show that road traffic attitudes are affected, in descending order, by partnership, resources, distribution, promotion, price, product, and public. The road traffic behavior of people is determined, in descending order, by age, moderator variables (the law and the validity of the law and weather), attitude, and education level. Based on the results, several recommendations to government officials and policymakers have been made.
    Źródło:
    Transport Problems; 2023, 18, 1; 193--202
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flight Height of UAV and Its Influence on the Precise Digital Elevation Model of Complex Terrain
    Wysokość lotu UAV i jego wpływ na precyzyjny cyfrowy model wysokości złożonego terenu
    Autorzy:
    Bui, Xuan Nam
    Nguyen, Quoc Long
    Le, Thi Thu Ha
    Bui, Ngoc Quy
    Goyal, Ropesh
    Vo, Trong Hung
    Pham, Van Chung
    Cao, Xuan Cuong
    Le, Van Canh
    Le, Hong Viet
    Powiązania:
    https://bibliotekanauki.pl/articles/319327.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    UAV
    DEM
    accuracy
    complex terrain
    open-pit mines
    dokładność
    złożony teren
    kopalnie odkrywkowe
    Opis:
    The application of lightweight Unmanned Aerial Vehicle (UAV) has been increasingly common in 3D topographic surveys. Especially in the complex terrains such as open-pit mines, where the elevation is rapidly undulating, the UAV based mapping is more efficient, economic and safe compared to the conventional methods. However, one of the most important factors in UAV mapping of complex terrain is the flight altitude which needs to be seriously considered because of the safety and accuracy of generated DEMs. This paper aims to evaluate the influence of flight height on accuracy of DEMs generated for open-pit mines. For this purpose, the selected study area is a quarry with complex terrain located in the Northern Vietnam. The investigation was conducted with five flight heights of 50 m, 100 m, 150 m, 200 m, and 250 m. To assess the accuracy of resulting DEMs, 10 ground control points and 385 checkpoints measured by both GNSS/RTK and total station methods were used. The accuracy of DEM was assessed by using root-mean-square error (RMSE) in X, Y, Z, XY, and XYZ components. The result showed that the DEM models generated at the flight heights of less than 150 m have high accuracy, RMSEs on the 10 GCPs increased from 1.8 cm to 6.2 cm for vertical (Z), and from 2.6 cm to 6.3 cm for horizontal (XY), whereas RMSE on 385 checkpoints increases gradually from 0.05 m to 0.15 m for vertical (Z) when the height flight increased from 50 m to 250 m.
    Zastosowanie lekkich bezzałogowych statków powietrznych (UAV) jest coraz bardziej powszechne w badaniach topograficznych 3D. Zwłaszcza w skomplikowanych terenach, takich jak kopalnie odkrywkowe, w których wzniesienie gwałtownie faluje, mapowanie oparte na UAV jest bardziej wydajne, ekonomiczne i bezpieczne w porównaniu z metodami konwencjonalnymi. Jednak jednym z najważniejszych czynników w mapowaniu UAV złożonego terenu jest wysokość lotu, którą należy poważnie rozważyć ze względu na bezpieczeństwo i dokładność generowanych DEM. Niniejszy artykuł ma na celu ocenę wpływu wysokości lotu na dokładność DEM generowanych dla kopalni odkrywkowych. W tym celu wybranym obszarem badawczym jest kamieniołom o złożonym terenie położony w północnym Wietnamie. Badanie przeprowadzono przy pięciu wysokościach lotu 50 m, 100 m, 150 m, 200 m i 250 m. Aby ocenić dokładność uzyskanych DEM, wykorzystano 10 naziemnych punktów kontrolnych i 385 punktów kontrolnych mierzonych zarówno metodami GNSS/RTK, jak i metodami stacji całkowitej. Dokładność DEM oceniono za pomocą błędu pierwiastkowego średniego kwadratu (RMSE) w komponentach X, Y, Z, XY i XYZ. Wynik pokazał, że modele DEM generowane na wysokościach lotu poniżej 150 m mają wysoką dokładność, RMSE na 10 GCP wzrosły z 1,8 cm do 6,2 cm dla pionu (Z) i od 2,6 cm do 6,3 cm dla poziomu (XY), podczas gdy RMSE na 385 punktach kontrolnych wzrasta stopniowo z 0,05 m do 0,15 m dla pionu (Z), gdy lot na wysokości wzrósł z 50 m do 250 m.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 1; 179-186
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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