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Tytuł:
Study on the possibility of using artificial pillar to replace the protection coal pillar of the preparation roadways during the mining process at underground coal mines in Quang Ninh region, Vietnam
Badanie możliwości zastosowania sztucznego filaru do zastąpienia ochronnego filaru węglowego na drogach przygotowawczych podczas procesu wydobycia w podziemnych kopalniach węgla w regionie Quang Ninh w Wietnamie
Autorzy:
Cuong, Dinh Van
Thanh, Tran Van
Tuan, Nguyen Anh
Powiązania:
https://bibliotekanauki.pl/articles/318747.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
podziemne kopalnie węgla
Wietnam
filary
underground coal mines
Vietnam
pillars
Opis:
The coal reserves in protection pillar of roadways are expected to be left in the mining process in underground mines in Quangninh coal basin which is relatively large (about 16% of the total reserves). If it can be exploited, it will help to save non-renewable coal resources, reduce the cost of preparing roadway meters, extend the mine life and increase the efficiency of construction investment. In the world, in order to reduce coal loss in protection pillar of roadways, mining technology to exploit and use artificial protection pillars are quite popular. Accordingly, in order to simultaneously exploit coal in the protection pillar and maintain the transport roadway as a ventilation roadway for the longwall in below level, the post-mining coal pillar will be replaced by artificial pillars formed from the stone backfill cribs, columns, metal cribs, chemical materials or low-grade concrete mortar mixes formed from fly ash, bottom ash of thermal power plants, combined crushed waste rock and a cement additive,... This paper will evaluate the possibility and propose a number of mining technological scheme as well as the type of construction materials suitable for artificial columns.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 192-198
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability-Based Assessment of Galloping Instability of Thin-Walled Steel Beams
Autorzy:
Nguyen, Huu Anh Tuan
Powiązania:
https://bibliotekanauki.pl/articles/27314733.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
instability
wind speed
Monte Carlo simulation
reliability index
safety factor
niestabilność
prędkość wiatru
Monte Carlo
wskaźnik niezawodności
współczynnik bezpieczeństwa
Opis:
Galloping instability relating to cross-wind vibrations can be found in flexible and lightly damped structures. In the present paper, the reliability of a thin-walled steel beam in maintaining its galloping stability was examined using a probabilistic approach. The analysis considered random variation in the cross-sectional geometrical properties of the beam, the material elastic modulus, the structural damping and the wind speed. A large number of Monte Carlo simulations were performed with normal and Gumbel distributions applied to the random variables to determine the probability distribution function of the safety margin. The limit state is considered violated when the wind speed exceeds the onset wind velocity of galloping, resulting in the aerodynamic damping being greater than the structural damping. It was shown by a conventional codified safety factor method that the beam was robust enough for galloping stability. By contrast, the probability-based assessment revealed that the beam failed to achieve the target reliability index in case the coefficient of variation of wind speed was greater than 5%. The analysis results suggested that the code-satisfied slenderness of the beam should be reduced by a factor of 1.5-1.7 under the action of wind speed with a coefficient of variation in the range 30-40%.
Źródło:
Civil and Environmental Engineering Reports; 2022, 32, 2; 23--35
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Difference in flotation behavior of galena by single and multi-step chronoamperometric oxidation
Autorzy:
Ozdemir, Orhan
Hampton, Marc A
Nguyen, Tuan
Nguyen, Anh
Powiązania:
https://bibliotekanauki.pl/articles/110510.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
surface roughness
hydrophobicity
contact angle
elemental sulfur
galena
chronoamperometry
Opis:
The relationship between electrochemical oxidation (Chronoamperometry) of galena surfaces and collocterless galena flotation was investigated in detail. The chronoamperometry (CA) micro- flotation experiments and zeta potential experiments were performed with ground galena particles (106×53 μm). In addition, contact angle measurements were carried out with a freshly cleaved galena sample at pH 4 in order to investigate any changes in galena surface hydrophobicity after the surface oxidation electrochemically. The results from this study indicated that there is a strong link between the nano/micro-physico-chemical properties of a sulphide on galena surfaces and collectorless flotation of galena particles at pH 4. The results were also supported with the electrokinetics behavior and contact angle values of galena particles.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 3; 812-821
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Delay factors in the construction of irrigation and hydropower projects in Vietnam
Autorzy:
Nguyen, Van Son
Nguyen, Huu Hue
Nguyen, Duc Anh
Hai, Dinh Tuan
Powiązania:
https://bibliotekanauki.pl/articles/2203414.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hydroenergetyka
nawadnianie
konstrukcja
zarządzanie projektem
współczynnik opóźnienia
Wietnam
hydropower
irrigation
construction
project management
delay factor
Vietnam
Opis:
Irrigation and hydropower are among the most important sectors in the construction industry that propel the economic needs of a developing country like Vietnam. The construction of these projects often suffers from severe delays, leading to financial losses and other negative impacts on the economy. This paper aims to determine delay factors in the construction of these projects. Among many, 39 most important candidates of delay causes were identified from the literature review. Further surveys on project participants were conducted for the severity of these causes. An exploratory factor analysis was utilized to identify latent factors that cause delays in construction projects. The analysis result categorized a few groups of factors such as abnormal factors on the construction site (e.g., labor accidents, hydrology, water flow, extreme weather) and technical factors related to the construction contractor (e.g., unsuitable schedule, outdated construction technology, unprofessional workers) that have the greatest impact on the delay in construction of irrigation and hydropower projects in Vietnam. These findings contribute to the body of knowledge of project management and risk management, hence an improvement in the efficiency of the project sectors’ performance.
Źródło:
Archives of Civil Engineering; 2023, 69, 1; 5--20
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining for an output capacity of dimension stone exploitation from the computer simulations to generate the fracture network in 3D: case study in some dimensional stone quarries in Vietnam
Określenie wydajności wykorzystania kamienia blocznego z symulacji komputerowych w celu wygenerowania sieci pęknięć w 3D: studium przypadku w kamieniołomach kamieni blocznych w Wietnamie
Autorzy:
Nguyen, Anh Tuan
Pham, Van Hoa
Pham, Van Viet
Le, Van Quyen
Le, Thi Hai
Nguyen, Tuan Anh
Powiązania:
https://bibliotekanauki.pl/articles/318207.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
kamieniołomy
Wietnam
symulacja komputerowa
quarries
Vietnam
computer simulation
Opis:
In dimension stone quarry exploitations such as the marble quarry, a literature review of the existing numerical modelling techniques has been carried out. According to Distinct Element Method, discontinuities have been treated as boundary conditions between blocks and, consequently, an accurate knowledge of joint distribution and orientation was required. The result of analyzing data and simulating in the fracture rock environment, which is applied to a mining condition of the dimensional stone quarries. The research we introduce in the output capacity of the dimension stone quarry from the computer simulations to generate the fracture network in 3D with an aim of evaluating the size of the blocks. The results of numerical models have been used to optimize some of the technical parameters for dimensional stone extraction and ensuring stable bench in the mining operation.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 135-146
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Land Subsidence Detection in Tan My-Thuong Tan Open Pit Mine and Surrounding Areas by Time Series of Sentinel-1 Images
Wykrywanie osiadania powierzchni terenu górniczego w kopalni odkrywkowej Tan My-Thuong Tan i okolicach na podstawie wieloczasowych satelitarnych obrazów Sentinel-1
Autorzy:
Tran, Van Anh
Bui, Xuan‑Nam
Nguyen, Quoc Long
Tran, Tuan-Anh
Powiązania:
https://bibliotekanauki.pl/articles/319075.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
open-pit mines
PSInSAR
land subsidence
Sentinel-1
Tan My-Thuong Tan
kopalnia odkrywkowa
osiadanie terenu
kamieniołom Tan My-Thuong Tan
Opis:
Open-pit or underground mining both causes environmental impacts such as air, soil, water pollution, etc., especially causing land subsidence of mines and surrounding areas. Research on mining subsidence is often carried out by field survey, the advantage of this method is high accuracy, but it is usually applied in a small scale. Recently, with the development of radar technology, there have been many studies applying this Radar Interferometry technique to determine surface subsidence over a wide range with a few millimeters accuracy. In this paper, 24 Sentinel-1 images were used as input materials, using the Permanent Scatter Interferometry (PSInSAR) method to determine the land subsidence of the Tan My-Thuong Tan quarries and surrounding areas. The results were compared with the average annual subsidence of 20 surveying points using GNSS technology from 1/2018 to 3/2020. The correlation coefficient of annual average land subsidence of the two methods is 0.83, showing the feasibility of applying InSAR Sentinel-1 data processed by PSInSAR method for determining mine surface deformation and surrounding area.
Zarówno górnictwo odkrywkowe, jak i podziemne powodują osiadanie powierzchni terenu górniczego i na otaczających obszarach. Badania osiadań górniczych są często prowadzone metodą monitorowania punktów stabilizowanych na liniach obserwacyjnych. Zaletą tej metody jest duża dokładność, ale najczęściej stosowana jest na niewielkim obszarze. Satelitarna interferometria radarowa InSAR jest teledetekcyjną techniką służącą do pozyskiwania danych osiadań powierzchni terenu w określonym przedziale czasu. Odpowiednie opracowanie dwóch radarogramów pozwala na uzyskanie izolinii okresowych niecek obniżeniowych na dużym obszarze. W artykule, przedstawiono wyniki zastosowania 24 obrazów satelitarnych Sentinel-1 wykorzystując metodę Permanent Scatter Interferometry (PSInSAR) do określenia osiadań powierzchni terenu górniczego kamieniołomu Tan My-Thuong Tan i okolic. Wyniki porównano ze średnimi rocznymi osiadaniami 20 punktów pomiarowych wykorzystujących technologię GNSS od 1/2018 do 3/2020. Współczynnik korelacji średnich rocznych osiadań gruntów obu metod wynosi 0,83, co wskazuje na możliwość wykorzystania danych InSAR Sentinel-1 przetworzonych metodą PSInSAR do wyznaczenia osiadań powierzchni terenu kopalni i otaczającego ją obszaru.
Źródło:
Inżynieria Mineralna; 2020, 1, 2; 171-180
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite Element Method Application to Determine Appropriate Splitting Parameters for Dimensional Stone Quarries
Zastosowanie metody elementów skończonych do określania odpowiednich parametrów łupania w kamieniołomach kamieni blocznych
Autorzy:
Pham, Van Viet
Nguyen, Anh Tuan
Pham, Van Hoa
Powiązania:
https://bibliotekanauki.pl/articles/318502.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
dimension stone
splitting techniques
simulation
finite element method
FEM
kamienie bloczne
techniki łupania
symulacja
metoda elementów skończonych
Opis:
In dimension stone extraction, there have existed many block cutting techniques from intact rock or from a large block to smaller blocks such as disc sawing, chainsawing, diamond wire sawing and splitting techniques, one of which still has recently been used with the other modern methods is splitting techniques. The usage of the splitting methods has still based on the practical experience of mining workers on calculating the spacing of two holes in the co-planar line, resulting in increasing the roughness of the cutting face. The paper studies a relationship between beating force and two-hole spacing based on rock mass properties of dimension stone in order to find proper splitting parameters. The paper deploys the Finite Element Method (FEM) with computer simulation in 2D using Phase2 software. From input data including rock mechanics (unit density, Young’s modulus, Poisson’s rate), compressive pressure on the hole wall due to the force, the spacing, the simulation represents stress and displacement distributions along the two adjacent holes. A regression function for a relationship between the pressure and the spacing is established with the results of stress distribution along the two adjacent holes, compared to uniaxial tensile strength through running the software, which leads to making suggestions to appropriate splitting parameters.
W zakresie wydobywania złoża kamieni blocznych istniało wiele technik cięcia bloków, od nienaruszonej skały lub od dużych bloków do mniejszych bloków, takich jak piły tarczowe, piły łańcuchowe, piły diamentowe i tech-niki łupania, z których jedna jest ostatnio używana z drugą nowoczesną metody to techniki dzielenia. Stosowa-nie metod łupania nadal opiera się na praktycznym doświadczeniu górników przy obliczaniu rozstawu dwóch otworów w linii współpłaszczyznowej, co skutkuje zwiększeniem chropowatości czoła skrawania. W artykule zbadano zależność między siłą uderzenia a rozstawem dwóch otworów na podstawie właściwości górotworu kamieni blocznych w celu znalezienia odpowiednich parametrów rozłupywania. W artykule zastosowano meto-dę elementów skończonych (MES) z symulacją komputerową 2D przy użyciu oprogramowania Phase2. Na pod-stawie danych wejściowych obejmujących mechanikę skał (gęstość jednostkowa, moduł Younga, współczynnik Poissona), ciśnienie ściskające na ścianę otworu spowodowane siłą, rozstaw, symulacja przedstawia rozkłady naprężeń i przemieszczeń wzdłuż dwóch sąsiednich otworów. Na podstawie wyników rozkładu naprężeń wzdłuż dwóch sąsiednich otworów, w porównaniu z jednoosiową wytrzymałością na rozciąganie po uruchomieniu oprogramowania, ustala się funkcję regresji zależności między ciśnieniem a rozstawem, co prowadzi do sugestii dotyczących odpowiednich parametrów rozłupywania.
Źródło:
Inżynieria Mineralna; 2020, 1, 2; 95-103
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A model of Lean Management for organizational innovation: cases in visegrád and AFTA
Autorzy:
Tran, Tuan-Anh
Ghabour, Rajab
Nguyen, My
Daróczi, Miklós
Powiązania:
https://bibliotekanauki.pl/articles/88557.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
Lean management
organizational innovation
knowledge transfer
V4
AFTA
lean management
innowacje organizacyjne
transfer wiedzy
Opis:
Originated as a production management philosophy, Lean Manufacturing has successfully transferred and implemented globally. Lean genealogy studies have been conducted, indicating the essential concept now evolves to Lean Management (LM), which is applicable to many branches of production and services management, viz quality and productivity, human resources, knowledge and technology, etc. Innovation has been made to ensure a smooth customization of knowledge and principles, tailored to each organization who is eager to implement this state-of-the-art management system. However, failures are becoming commonplace due to the lack of understanding the core values, and insufficient intensification of compensation for cultural differences. In this paper, cases of implementing LM across the Visegrád group (V4) and the ASEAN Free Trade Area (AFTA) from previous literature are taken into consideration. Factors that differentiate the characteristic of LM are brought to discussion. Therefore, the discovered gap between the two trade blocs urges the in-depth amendment and modification of employed concepts, tools, etc. A model is consequently elaborated, which aims at facilitate the managerial decision-making process regarding knowledge transfer of LM between V4 and AFTA, based on critical factors related to human, technology and culture, i.e. Labor cost, Manual requirement, Awareness, Continuous Improvement culture. This model can be used to predict the change should be made, or the criterion should be fulfilled to transfer the implementation and knowledge of LM effectively.
Źródło:
System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 532-541
2657-5450
Pojawia się w:
System Safety : Human - Technical Facility - Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Community participation for developing rural transport infrastructure in Dong Nai province, Vietnam
Autorzy:
Hai, Dinh Tuan
Quyet, Nguyen Xuan
Nguen, Duc Anh
Powiązania:
https://bibliotekanauki.pl/articles/2098152.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
community
Dong Nai
infrastructure
transport
Vietnam
społeczność
infrastruktura
Wietnam
Opis:
Developing countries are facing sustainability problems in developing rural transport infrastructure; the problems arise from the lack of financial resource and public support. Enhancing community participation promises to resolve these challenges. Demographics has a strong influence on community participation; however, how demographic characteristics interact with community participation has been yet to be focally studied. Dong Nai, a southern province in Vietnam, was selected as the case study owing to its high requirement of rural transport infrastructure. Questionnaires were sent to 438 households. An analysis of data was performed descriptively and with logistic regression. Community participation was recorded as financial, labor, material, and land contribution. Household composition, education, income, and member in household as community leader are among the highest influential factors to community participation. With the importance of community participation, the results of the study benefits both policy makers and local governments in planning, predicting the success of local development programs, and enhancing community participation, which increase the chance of success in rural transport infrastructure.
Źródło:
Transport Problems; 2021, 16, 2; 45--57
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exposure to Noise Induced at Work and Prevention Practice Among Workers of Stone Mining Company, An Giang, 2018
Narażenie na hałas podczas pracy i praktyka prewencyjna wśród pracowników pracujących w kamieniołomach w rejonie prowincji An Giang, 2018
Autorzy:
Nguyen, Ngoc Bich
Huynh, thi Hong Giang
Vo, Tan Khoa
Nguyen, Anh Tuan
Nguyen, Thuy Quynh
Powiązania:
https://bibliotekanauki.pl/articles/317894.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
noise
occupational exposure
prevention practice
stone mining
Vietnam
zanieczyszczenie hałasem
narażenie zawodowe
praktyka profilaktyczna
wydobycie kamienia
An Giang
Opis:
Noise is one of the most common occupational hazards in Vietnam, causing occupational hearing impairement. Stone mining is among the high-risk working environment. This study aims to describe noise exposure and prevention practice among workers of stone mining in An Giang province. A cross-sectional study using a quantitative method was conducted in 2018. 176 noise samples were collected, and 215 workers were interviewed using a structured questionnaire. Results show that workers at grinding section exposed with the high level of noise (compared to national standards) and they did not practice adequately to protect themselves from the hazard. Workers aged above 39 years old and had more than 10-year working experience had better prevention practice than the other groups. The differences were statistically significant. It is concluded that workers were exposed to the high level of noise at work, their practice regarding hearing impairement prevention was not adequate, and age, years of working were associated factors with prevention practice among workers.
W kamieniołomach na rejonie prowincji An Giang występuje szereg źródeł lub procesów emitujących hałas, który powoduje uciążliwość akustyczną przede wszystkim na stanowiskach pracy. Część procesów/źródeł pozostaje poza możliwościami zastosowania wyciszeń użycie materiałów wybuchowych w kopalni czy stosowanie ciężkiego sprzętu do transportu urobku. Uciążliwe dźwięki mogą być szkodliwe nie tylko dla słuchu, ale mają negatywny wpływ na cały organizm. Niniejsze badanie ma na celu opisanie narażenia na hałas i praktyk zapobiegawczych wśród pracowników górnictwa kamienia w prowincji An Giang. W 2018 roku przeprowadzono badanie przekrojowe metodą ilościową. Pobrano 176 próbek hałasu i przeprowadzono wywiady z 215 pracownikami za pomocą ustrukturyzowanego kwestionariusza. Wyniki pokazują, że pracownicy sekcji szlifowania narażeni byli na wysokim poziomie hałasu (w porównaniu z normami krajowymi) i nie ćwiczyli odpowiednio, aby chronić się przed zagrożeniem. Pracownicy w wieku powyżej 39 lat i mający ponad 10-letnie doświadczenie zawodowe mieli lepsze praktyki profilaktyczne niż inne grupy. Stwierdzono, że pracownicy byli narażeni na wysokim poziomie hałasu w miejscu pracy, ich praktyka w zakresie profilaktyki wad słuchu nie była adekwatna, a wiek, lata pracy były czynnikami związanymi z praktyką profilaktyczną wśród pracowników.
Źródło:
Inżynieria Mineralna; 2020, 1, 2; 283-289
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How do contractors select material suppliers for construction projects? Evidence from Vietnam
Autorzy:
Toan, Nguyen Quoc
My, Hanh Nguyen Thi
Tam, Nguyen Van
Anh, Pham Xuan
Hai, Dinh Tuan
Thuy, Nguyen Thi
Powiązania:
https://bibliotekanauki.pl/articles/2174011.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dostawca materiałów
wykonawca
wybór
projekt budowlany
materials supplier
contractor
selection
construction project
Opis:
Materials play an important role in determining the quality and cost of a building, especially in the context of Vietnam’s rapid urbanization today. This study aims to analyze the status quo for supplier selection for construction projects in a developing country, Vietnam. Questionnaires are designed to conduct a survey among several contractors to assess the current situation of how Vietnamese construction enterprises select their material suppliers. Senior managers, project managers, site commanders, site engineers, foreman, office staff of contractors were interviewed. Based on result analysis of 117 valid responses, the most important criteria to consider when selecting material suppliers have been identified, with the most influential ones being price, delivery time, and material quality. However, the supply of materials still reveals some constraints that must be overcome. Vietnamese construction firms should pay more attention to supplier selection to optimize material delivery efficiency. This research contributes to the understanding of the status quo for supplier selection for construction projects in a developing country. This means contractors can adopt suitable measures to select material suppliers for construction projects.
Źródło:
Archives of Civil Engineering; 2022, 68, 3; 273--288
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of dynamic load factors for human walking excitation for floor vibration design
Autorzy:
Nguyen, Huu Anh Tuan
Lythgo, Noel
Gad, Emad
Wilson, John
Haritos, Nicholas
Powiązania:
https://bibliotekanauki.pl/articles/2174209.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
podłoga
płyta żelbetowa
wibracja podłogi
walking excitation
step frequency
dynamic load factor
floor vibration
design guide
Opis:
This paper discusses the derivation of a set of dynamic load factors for calculation of walking response on the basis of measurements made during a biomechanics research carried out with young adults. Firstly, a quite large number of experimental data on single footstep force were collected. The single footstep forces were then superimposed to generate the force time history for a continuous walk. This was followed by the transformation of the resultant force to the frequency domain from which the dynamic load factors for the first ten harmonics of a pacing rate can be extracted. A statistical analysis was employed on the dynamic load factors to acquire their design values in terms of the 90-th or 95-th percentile. The waking force function recommended by various design guides and that developed in the paper were then used in a comprehensive finite element model to predict the vibration level of a building floor. Current design guides on floor vibration normally suggest using four harmonics in the walking force whereas load factors for ten harmonics were developed in this paper. The acceleration response of the floor was found to increase by 5-33% when walking harmonics beyond the fourth harmonic were considered. The inclusion of higher harmonics would therefore lead to a more conservative estimation of the floor response.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 103--114
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dimension-Stone Quarrying Optimization through Integrated Modelling between Joint Sets and Cutting Grid: a Case Study at Tan Long Dimension Stone Quarry in Southcentral Coastal Province of Binh Dinh
Autorzy:
Pham, Van Viet
Nguyen, Anh Tuan
Pham, Van Hoa
Tran, Dinh Bao
Powiązania:
https://bibliotekanauki.pl/articles/27323286.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
dimension stone
modelling
joint sets
block size
recovery ratio
cutting rat
kamienie
rozmiar
kamieniołomy
Wietnam
Opis:
Dimension-stone quarrying optimization is significantly important to increase the recovery ratio of dimension stone and to reduce the cutting cost. Due to fracture-existed rock mass, in the mining operation block size and mining direction influences to the recovery ratio and the cutting cost. Therefore, the paper suggests the quarrying optimization for dimension stone to obtain the highest recovery ratio and the lowest cutting cost, based on optimizing block size and mining direction to get a cutting grid of dimension stone. Through developing an integrated modelling between joint set modelling and cutting grid modelling, intact blocks and fractured blocks were generated. From this, block statistics were conducted to get the maximum recovery ratio of dimension stone and the minimum cutting rate between the cutting area and the recovered block volume, which helps to choose an optimizing block size and mining direction. The research was carried out at Tan Long dimension stone quarry where a block size (0.9m x 0.6m x 1.35m) and a mining direction paralleling to joint set 1 will ensure the highest recovery ratio of 13.87% and the lowest cutting rate of 25 m2/m3.
Źródło:
Inżynieria Mineralna; 2023, 2; 239--248
1640-4920
Pojawia się w:
Inżynieria Mineralna
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:
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
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