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Tytuł:
A Numerical Method for the Design of the U-Shaped Segmental Tunnel Lining under the Impact of Earthquakes: A Case Study of a Tunnel in the Hanoi Metro System
Autorzy:
Nguyen, Chi Thanh
Do, Ngoc Anh
Pham, Van Vi
Gospodarikov, Alexandr
Powiązania:
https://bibliotekanauki.pl/articles/2020136.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
numerical method
U-Shaped segmental tunnel lining
impact of earthquakes
Hanoi metro system
wstrząsy
Wietnam
metro
Opis:
Circular tunnels are usually encountered when excavation tunnel. However, the U-shaped tunnel lining is used a lot in practice because of it’s advantages. However, there are not many studies in the world to calculate and design for underground structures with U-shaped tunnel lining, especially in the case of tunnels being affected by earthquakes. This paper proposes a new numerical-HRM method approach for the analysis of U-shaped segmental tunnel lining under the impact of earthquakes. Hanoi is the capital of Vietnam, this is a big city with more than 8 million people. Hanoi is located between two major fault systems, the Red River fault system and the Son La-Dien Bien-Lai Chau fault system. Therefore, the Hanoi area is assessed as likely to be affected by earthquakes of magnitude Mw = 6.1 up to 6.5 Richter. The Hanoi metro system is constructed by TBM and the U-shaped segmental tunnel lining is also one of the types of tunnel lining considered for use in the construction of metro tunnels in Hanoi. The improved HRM method has been used to investigate the effect of joints in the tunnel lining from the Hanoi system metro under the impact of earthquakes is conducted considering from the results of the tunnel lining behavior in terms of bending moment (M), normal forces (N) and tunnel lining displacements (δn) in both cases: the U-shaped continuous tunnel lining and the U-shaped segmental tunnel lining.
Źródło:
Inżynieria Mineralna; 2021, 2; 305--320
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the influence of printing orientation in metal printing using material extrusion technology on the mechanical properties of 17-4 stainless steel products
Autorzy:
Dang, Long Cao
Nguyen, Cuong Van
Le, Anh Hoang
Bui, Danh Thanh
Powiązania:
https://bibliotekanauki.pl/articles/28407327.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
additive manufacturing
material extrusion
17-4 PH stainless steel
mechanical properties
Opis:
This study investigated the influence of print orientation on the mechanical properties of 17-4 PH stainless steel parts fabricated using material extrusion technology. Tensile test specimens were 3D printed in different orientations (flat, on-edge, and upright), and their mechanical properties were evaluated. The results showed that the print orientation significantly affected the ultimate tensile strength, yield strength, and elongation at failure of the specimens. The flat and on-edge orientations exhibited similar mechanical properties, while the upright orientation resulted in lower strength and higher fracture susceptibility. Hardness measurements also indicated variations in hardness distribution among the orientations. The findings emphasize the importance of optimizing the print orientation parameter to achieve desired mechanical characteristics in 17-4 PH stainless steel parts.
Źródło:
Journal of Machine Engineering; 2023, 23, 4; 89--100
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
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:
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:
Design optimization of compliant mechanisms for vibration assisted machining applications using a hybrid Six Sigma, RSM-FEM, and NSGA-II approach
Autorzy:
Pham, Huy-Tuan
Nguyen, Van-Khien
Dang, Quang-Khoa
Duong, Thi Van Anh
Nguyen, Duc-Thong
Phan, Thanh-Vu
Powiązania:
https://bibliotekanauki.pl/articles/24084644.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
compliant mechanism
multi-objective optimisation
Six Sigma
NSGA-II
Opis:
Vibration-assisted machining, a hybrid processing method, has been gaining considerable interest recently due to its advantages, such as increasing material removal rate, enhancing surface quality, reducing cutting forces and tool wear, improving tool life, or minimizing burr formation. Special equipment must be designed to integrate the additional vibration energy into the traditional system to exploit those spectacular characteristics. This paper proposes the design of a new 2-DOF high-precision compliant positioning mechanism using an optimization process combining the response surface method, finite element method, and Six Sigma analysis into a multi-objective genetic algorithm. The TOPSIS method is also used to select the best solution from the Pareto solution set. The optimum design was fabricated to assess its performance in a vibration-assisted milling experiment concerning surface roughness criteria. The results demonstrate significant enhancement in both the manufacturing criteria of surface quality and the design approach criteria since it eliminates modelling errors associated with analytical approaches during the synthesis and analysis of compliant mechanisms.
Źródło:
Journal of Machine Engineering; 2023, 23, 2; 135--158
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
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:
Estimation of Coal and Rock Mechanical Properties for Numerical Modelling of Longwall Extraction
Szacowanie właściwości mechanicznych węgla i skał do numerycznego modelowania eksploatacji ścian
Autorzy:
Le, Tien Dung
Nguyen, Chi Thanh
Dao, Van Chi
Powiązania:
https://bibliotekanauki.pl/articles/318548.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
laboratory test
rock mass properties
strength reduction
field scale modelling
badanie laboratoryjne
właściwości górotworu
redukcja wytrzymałości
modelowanie polowe
Opis:
Reliable estimation of coal and rock mechanical properties at field scale is a prerequisite for numerical modelling of rock behaviours associated with longwall extraction. This paper describes a systematic approach from data collection, laboratory testing to rock mass properties derivation for simulation of longwall extraction, taking two longwall panels at Quang Ninh coalfield in Vietnam for example. The mechanical properties are verified through comparison with published data of the field, indicating close agreements. A simple numerical model is further developed to demonstrate the proper use of the obtained data. The simulation suggests that the ratio of model length to excavation length should be in the range of 2.5–5; uniaxial compressive strength, deformation modulus and tensile strength can be reduced by a factor of 5.0, 2.13 and 2.0, respectively; and a calibration and validation process must be performed to match in-situ longwall’s behaviours. The approach can be applied for derivation of reliable rock mass properties for numerical simulation of underground excavations.
Rzetelne oszacowanie właściwości mechanicznych węgla i skał w skali polowej jest warunkiem koniecznym do numerycznego modelowania zachowań skał związanych z eksploatacją ścianową. W artykule, opisano systematyczne podejście od gromadzenia danych, badań laboratoryjnych do wyznaczania właściwości górotworu w celu symulacji eksploatacji ścian, na przykład na dwóch panelach ścianowych na polu węglowym Quang Ninh w Wietnamie. Właściwości mechaniczne są weryfikowane poprzez porównanie z opublikowanymi danymi polowymi, wskazując na bliskie uzgodnienia. Dalej rozwijany jest prosty model numeryczny w celu zademonstrowania właściwego wykorzystania uzyskanych danych. Symulacja sugeruje, że stosunek długości modelu do długości wykopu powinien zawierać się w przedziale 2,5–5; jednoosiową wytrzymałość na ściskanie, moduł odkształcenia i wytrzymałość na rozciąganie można zmniejszyć odpowiednio o współczynnik 5,0, 2,13 i 2,0; oraz należy przeprowadzić proces kalibracji i walidacji, aby dopasować zachowanie ściany na miejscu. Podejście to można zastosować do wyprowadzenia wiarygodnych właściwości górotworu do numerycznej symulacji podziemnych wyrobisk.
Źródło:
Inżynieria Mineralna; 2020, 1, 2; 41-47
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:
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:
Hybrid robot hand for stably manipulating one group objects
Autorzy:
Nguyen, Pho Van
Nguyen, Phi N.
Nguyen, Tan
Le, Thanh Lanh
Powiązania:
https://bibliotekanauki.pl/articles/27309856.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
hybrid gripper
soft gripper
manipulate group objects
handle multiple objects
hybrid
robot hand
chwytak hybrydowy
miękki chwytak
manipulowanie obiektami grupowymi
Opis:
Autonomous manipulation of group objects requires the gripper/robot hand to achieve high productivity without poor outcomes such as object slippage and damage. This article develops the robot hand capable of achieving effective performance in each trial of grasping the group objects. Our proposed robot hand consists of two symmetrical groups of hybrid fingers having soft pads on the grasping interfaces, which operate as a comb. The grasping ability of this robot hand was theoretically and experimentally validated by handling three groups of objects showcases: tea packs, toothbrushes, and mixing sticks. Additionally, validation results were compared with those of another soft robot hand having soft Pneunet fingers. In each trial, the experimental results showed that the proposed robot hand with hybrid fingers achieved more stable grasping states characterized by a higher number of grasped objects than those in the case of the soft robot hand. Also, experimental results were in good agreement with the predictions of the proposed theoretical analysis. Finally, better performances of the hybrid robot hand in handling the group object provide the bases for developing a novel-robotic application in industrial production.
Źródło:
Archive of Mechanical Engineering; 2022, LXIX, 3; 375--391
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identifying Key Parameters Influencing Soil Quality at Various Depths in Tram Chim National Park, Dong Thap Province, Vietnam
Autorzy:
Giao, Nguyen Thanh
Nhien, Huynh Thi Hong
Dan, Truong Hoang
Ni, Duong Van
Powiązania:
https://bibliotekanauki.pl/articles/2202379.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
soil quality
national park
organic matter
alkaline soil
multivariate analysis
Opis:
This study used multivariate statistics including cluster analysis (CA) and principal component analysis (PCA) to evaluate the variability and key indicators causing changes in soil quality in Tram Chim National Park, Dong Thap province, Vietnam. Soil samples were collected in the dry season at the habitats of Ischaemum rugosum (CM), Panicum repens (CO), Nelumbo nucifera (LS), Eleocharis dulcis (NO), Oryza rufipogon (LM), Rice field (RL), Melaleuca cajuputi (T) in two layers: A (0–20 cm) and B (20–40 cm). The parameters of pH, total nitrogen (TN), total phosphorus (TP), total acidity (TA), organic matter (OM), total iron (Fe) and exchanged aluminum (Al3+) were used to assess soil quality. The results showed that soil pH was low in both A and B layers. Fe and Al were both high, and the concentrations of these metals in layer A were higher than those in layer B. The OM content was medium while the TN and TP levels were very low. Most of the soil quality indicators tended to decrease with the depth (except for TA). The results of CA analysis showed that there was almost no major change in soil quality between the two soil layers; however, the soil quality in rice field habitat was different from other habitats. The cause may be due to human impact in adding fertilizers/pesticides during farming practices. The PCA results showed at least five influencing factors, explaining 99.7% and 99.9% of soil quality variation in A and B layers. The Al3+, TA, OM, and TP parameters had the main influence on the soil quality of layer A. Meanwhile, the pH, Al3+, TA, TN, Fet indicators had influence on the soil quality of layer B. These indicators need to be future surveyed to assess the evolution of soil quality in the study area.
Źródło:
Journal of Ecological Engineering; 2023, 24, 2; 81--91
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 31

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