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Journal articles on the topic 'MINRES method'
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1
Jian, Ling, Shuqian Shen, and Yunquan Song. "Improving the Solution of Least Squares Support Vector Machines with Application to a Blast Furnace System." Journal of Applied Mathematics 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/949654.
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The solution of least squares support vector machines (LS-SVMs) is characterized by a specific linear system, that is, a saddle point system. Approaches for its numerical solutions such as conjugate methods Sykens and Vandewalle (1999) and null space methods Chu et al. (2005) have been proposed. To speed up the solution of LS-SVM, this paper employs the minimal residual (MINRES) method to solve the above saddle point system directly. Theoretical analysis indicates that the MINRES method is more efficient than the conjugate gradient method and the null space method for solving the saddle point system. Experiments on benchmark data sets show that compared with mainstream algorithms for LS-SVM, the proposed approach significantly reduces the training time and keeps comparable accuracy. To heel, the LS-SVM based on MINRES method is used to track a practical problem originated from blast furnace iron-making process: changing trend prediction of silicon content in hot metal. The MINRES method-based LS-SVM can effectively perform feature reduction and model selection simultaneously, so it is a practical tool for the silicon trend prediction task.
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Ogino, Masao, Shin-ichiro Sugimoto, Seigo Terada, Yanqing Bao, and Hiroshi Kanayama. "A Large-Scale Magnetostatic Analysis Using an Iterative Domain Decomposition Method Based on the Minimal Residual Method." Journal of Advanced Computational Intelligence and Intelligent Informatics 16, no. 4 (June 20, 2012): 496–502. http://dx.doi.org/10.20965/jaciii.2012.p0496.
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This paper describes a large-scale 3D magnetostatic analysis using the Domain Decomposition Method (DDM). To improve the convergence of the interface problem of DDM, a DDM approach based on the Conjugate Residual (CR) method or the MINimal RESidual (MINRES) method is proposed. The CR or MINRES method improved the convergence rate and showed more stable convergence behavior in solving the interface problem than the Conjugate Gradient (CG) method, and reduced computation time for a large-scale problem with about 10 million degrees of freedom.
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Chin-Lung Fong, David, and Michael Saunders. "CG Versus MINRES: An Empirical Comparison." Sultan Qaboos University Journal for Science [SQUJS] 16 (April 1, 2012): 44. http://dx.doi.org/10.24200/squjs.vol17iss1pp44-62.
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For iterative solution of symmetric systems the conjugate gradient method (CG) is commonly used when A is positive definite, while the minimum residual method (MINRES) is typically reserved for indefinite systems. We investigate the sequence of approximate solutions generated by each method and suggest that even if A is positive definite, MINRES may be preferable to CG if iterations are to be terminated early. In particular, we show for MINRES that the solution norms are monotonically increasing when A is positive definite (as was already known for CG), and the solution errors are monotonically decreasing. We also show that the backward errors for the MINRES iterates are monotonically decreasing.
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Luk, Franklin T. "On the Minres Method of Factor Analysis." SIAM Journal on Scientific and Statistical Computing 6, no. 3 (July 1985): 562–72. http://dx.doi.org/10.1137/0906039.
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Li, Xin, Hao Liu, and Jingfu Zhu. "MINRES Seed Projection Methods for Solving Symmetric Linear Systems with Multiple Right-Hand Sides." Mathematical Problems in Engineering 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/357874.
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We consider the MINRES seed projection method for solving multiple right-hand side linear systemsAX=B, whereA∈Rn×nis a nonsingular symmetric matrix,B∈Rn×p. In general, GMRES seed projection method is one of the effective methods for solving multiple right-hand side linear systems. However, when the coefficient matrix is symmetric, the efficiency of this method would be weak. MINRES seed projection method for solving symmetric systems with multiple right-hand sides is proposed in this paper, and the residual estimation is analyzed. The numerical examples show the efficiency of this method.
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Pestana, J., and A. J. Wathen. "A Preconditioned MINRES Method for Nonsymmetric Toeplitz Matrices." SIAM Journal on Matrix Analysis and Applications 36, no. 1 (January 2015): 273–88. http://dx.doi.org/10.1137/140974213.
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Soodhalter, Kirk M. "A block MINRES algorithm based on the band Lanczos method." Numerical Algorithms 69, no. 3 (September 24, 2014): 473–94. http://dx.doi.org/10.1007/s11075-014-9907-z.
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Xie, Ze-Jia, Xiao-Qing Jin, and Zhi Zhao. "A Convergence Analysis of the MINRES Method for Some Hermitian Indefinite Systems." East Asian Journal on Applied Mathematics 7, no. 4 (November 2017): 827–36. http://dx.doi.org/10.4208/eajam.181016.300517h.
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AbstractSome convergence bounds of the minimal residual (MINRES) method are studied when the method is applied for solving Hermitian indefinite linear systems. The matrices of these linear systems are supposed to have some properties so that their spectra are all clustered around ±1. New convergence bounds depending on the spectrum of the coefficient matrix are presented. Some numerical experiments are shown to demonstrate our theoretical results.
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Muzhinji, Kizito, Stanford Shateyi, and Sandile Motsa. "The Mixed Finite Element Multigrid Preconditioned MINRES Method for Stokes Equations." Journal of Applied Fluid Mechanics 9, no. 3 (May 1, 2016): 1285–96. http://dx.doi.org/10.18869/acadpub.jafm.68.228.22805.
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Kanayama, Hiroshi, Masao Ogino, Shin-Ichiro Sugimoto, and Seigo Terada. "Large-Scale Magnetostatic Domain Decomposition Analysis Based on the MINRES Method." IEEE Transactions on Magnetics 49, no. 5 (May 2013): 1565–68. http://dx.doi.org/10.1109/tmag.2013.2238612.
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Choi, Sou-Cheng T., Christopher C. Paige, and Michael A. Saunders. "MINRES-QLP: A Krylov Subspace Method for Indefinite or Singular Symmetric Systems." SIAM Journal on Scientific Computing 33, no. 4 (January 2011): 1810–36. http://dx.doi.org/10.1137/100787921.
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CHANG, S. L., and C. S. CHIEN. "A MULTIGRID-LANCZOS ALGORITHM FOR THE NUMERICAL SOLUTIONS OF NONLINEAR EIGENVALUE PROBLEMS." International Journal of Bifurcation and Chaos 13, no. 05 (May 2003): 1217–28. http://dx.doi.org/10.1142/s0218127403007175.
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We study numerical methods for solving nonlinear elliptic eigenvalue problems which contain folds and bifurcation points. First we present some convergence theory for the MINRES, a variant of the Lanczos method. A multigrid-Lanczos method is then proposed for tracking solution branches of associated discrete problems and detecting singular points along solution branches. The proposed algorithm has the advantage of being robust and can be easily implemented. It can be regarded as a generalization and an improvement of the continuation-Lanczos algorithm. Our numerical results show the efficiency of this algorithm.
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Ogino, Masao, Shin-ichiro Sugimoto, and Hiroshi Kanayama. "703 A Large-scale Nonlinear Magnetostatic Analysis using a DDM-based MINRES method." Proceedings of The Computational Mechanics Conference 2012.25 (2012): 318–19. http://dx.doi.org/10.1299/jsmecmd.2012.25.318.
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Kanayama, H. "An Industrial Application of Thermal Convection Analysis." International Journal of Computational Methods 13, no. 02 (March 2016): 1640005. http://dx.doi.org/10.1142/s0219876216400053.
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A coupling analysis of thermal convection problems is performed in this work. By approximating the material derivative along the trajectory of fluid particle, the characteristic curve (CC) method can be considered. The most attractive advantage of this method is the symmetry of the linear system, which enables some classic symmetric linear iterative solvers, like the conjugate gradient (CG) method or the minimal residual (MINRES) method, to be used to solve the interface problem of the domain decomposition system. An application to industrial problems is demonstrated to show the effectiveness of our approach.
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Abdeslam, El Akkad. "Analysis of estimators for Stokes problem using a mixed approximation." Boletim da Sociedade Paranaense de Matemática 39, no. 6 (January 1, 2021): 105–28. http://dx.doi.org/10.5269/bspm.41354.
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In this work, we introduce the steady Stokes equations with a new boundary condition, generalizes the Dirichlet and the Neumann conditions. Then we derive an adequate variational formulation of Stokes equations. It includes algorithms for discretization by mixed finite element methods. We use a block diagonal preconditioners for Stokes problem. We obtain a faster convergence when applying the preconditioned MINRES method. Two types of a posteriori error indicator are introduced and are shown to give global error estimates that are equivalent to the true discretization error. In order to evaluate the performance of the method, the numerical results are compared with some previously published works or with others coming from commercial code like Adina system.
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Muzhinji, K., S. Shateyi, and S. S. Motsa. "The Mixed Finite Element Multigrid Method for Stokes Equations." Scientific World Journal 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/460421.
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The stable finite element discretization of the Stokes problem produces a symmetric indefinite system of linear algebraic equations. A variety of iterative solvers have been proposed for such systems in an attempt to construct efficient, fast, and robust solution techniques. This paper investigates one of such iterative solvers, the geometric multigrid solver, to find the approximate solution of the indefinite systems. The main ingredient of the multigrid method is the choice of an appropriate smoothing strategy. This study considers the application of different smoothers and compares their effects in the overall performance of the multigrid solver. We study the multigrid method with the following smoothers: distributed Gauss Seidel, inexact Uzawa, preconditioned MINRES, and Braess-Sarazin type smoothers. A comparative study of the smoothers shows that the Braess-Sarazin smoothers enhance good performance of the multigrid method. We study the problem in a two-dimensional domain using stable Hood-TaylorQ2-Q1pair of finite rectangular elements. We also give the main theoretical convergence results. We present the numerical results to demonstrate the efficiency and robustness of the multigrid method and confirm the theoretical results.
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Gatica, Gabriel N., and Norbert Heuer. "A Preconditioned MINRES Method for the Coupling of Mixed-FEM and BEM for Some Nonlinear Problems." SIAM Journal on Scientific Computing 24, no. 2 (January 2002): 572–96. http://dx.doi.org/10.1137/s106482750138887x.
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Shi, Shengzhu, Dazhi Zhang, and Jiamin Li. "Efficient Stochastic Galerkin Spectral Methods for Optimal Control Problems Constrained by Fractional PDEs with Uncertain Inputs." Journal of Sensors 2022 (July 22, 2022): 1–16. http://dx.doi.org/10.1155/2022/6369492.
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This paper is devoted to designing fast solvers and efficient preconditioners for the optimal control problems (OCPs) constrained by stochastic fractional elliptic equations. We first prove the existence and uniqueness of the stochastic optimal control solution and then derive the stochastic optimality system. For the numerical approximation, we use the stochastic Galerkin spectral methods, which apply the stochastic Galerkin method for the discretization of random variables and employ the spectral-Galerkin approach for the approximation of spatial variables. To solve the large coupled saddle-point system resulted from discretization, we adopt the most commonly used MINRES method and a more effective PPCG method in low-rank matrix iteration format. Specially, we develop the efficient preconditioners based on the matrix decomposition method and the virtual variable method. We also study the eigenvalue distribution of the corresponding preconditioned matrix. Besides, for the approximation of the discretized state equation, we use the mean-based approximation and the Ullmann approximation to handle different values of the variance of the random inputs. Finally, we present numerical experiments to demonstrate the effectiveness of our solvers and preconditioners.
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Liu, Lijun, and Masao Ogino. "Finite element analysis of high-frequency electromagnetic fields using an iterative substructuring method based on CS-MINRES-QLP." Proceedings of The Computational Mechanics Conference 2017.30 (2017): 152. http://dx.doi.org/10.1299/jsmecmd.2017.30.152.
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Yang, Li, Xue Wang, Junqi Zhu, Liyan Sun, and Zhiyuan Qin. "Comprehensive Evaluation of Deep Coal Miners’ Unsafe Behavior Based on HFACS-CM-SEM-SD." International Journal of Environmental Research and Public Health 19, no. 17 (August 29, 2022): 10762. http://dx.doi.org/10.3390/ijerph191710762.
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The unsafe behavior of miners seriously affects the safety of deep mining. A comprehensive evaluation of miners’ unsafe behavior in deep coal mines can prevent coal mine accidents. This study combines HFACS-CM, SEM, and SD models to evaluate miners’ unsafe behaviors in deep coal mining. First, the HFACS-CM model identifies the risk factors affecting miners’ unsafe behavior in deep coal mines. Second, SEM was used to analyze the interaction between risk factors and miners’ unsafe behavior. Finally, the SD model was used to simulate the sensitivity of each risk factor to miners’ unsafe behavior to explore the best prevention and control strategies for unsafe behavior. The results showed that (1) environmental factors, organizational influence, unsafe supervision, and unsafe state of miners are the four main risk factors affecting the unsafe behavior of miners in deep coal mines. Among them, the unsafe state of miners is the most critical risk factor. (2) Environmental factors, organizational influence, unsafe supervision, and the unsafe state of miners have both direct and indirect impacts on unsafe behaviors, and their immediate effects are far more significant than their indirect influence. (3) Environmental factors, organizational influence, and unsafe supervision positively impact miners’ unsafe behavior through the mediating effect of miners’ unsafe states. (4) Mental state, physiological state, business abilities, resource management, and organizational climate were the top five risk factors affecting miners’ unsafe behaviors. Taking measures to improve the adverse environmental factors, strengthening the organization’s supervision and management, and improving the unsafe state of miners can effectively reduce the risk of miners’ unsafe behavior in deep coal mines. This study provides a new idea and method for preventing and controlling the unsafe behavior of miners in deep coal mines.
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Tong, Ruipeng, Yanwei Zhang, Yunyun Yang, Qingli Jia, Xiaofei Ma, and Guohua Shao. "Evaluating Targeted Intervention on Coal Miners’ Unsafe Behavior." International Journal of Environmental Research and Public Health 16, no. 3 (February 1, 2019): 422. http://dx.doi.org/10.3390/ijerph16030422.
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Miners’ unsafe behavior is the main cause of roof accidents in coal mines, and behavior intervention plays a significant role in reducing the occurrence of miners’ unsafe behavior. However, traditional behavior intervention methods lack pertinence. In order to improve the intervention effect and reduce the occurrence of coal mine roof accidents more effectively, this study proposed a targeted intervention method for unsafe behavior. The process of targeted intervention node locating was constructed, and based on the analysis of 331 coal mine roof accidents in China, three kinds of targeted intervention nodes were located. The effectiveness of targeted intervention nodes was evaluated by using structural equation model (SEM) through randomly distributing questionnaires to miners of Pingdingshan coal. The results show that, in preventing roof accidents of coal mines, the targeted intervention nodes have a significant positive impact on the intervention effect. The method can also be applied to the safety management of other industries by adjusting the node location and evaluation process.
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Joksimović, Bojan, Biljana Mijović, Biljana Čančar, Milena Božinović, Zlatko Maksimović, Slobodan Stanić, and Đorđe Jevtić. "Pneumoconiosis among miners in coal mines." Биомедицинска истраживања 12, no. 2 (2021): 184–92. http://dx.doi.org/10.5937/bii2102184j.
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Pneumoconiosis of workers in brown coal mines is an occupational disease, a global public health problem and a serious disease of the lung parenchyma. If it is not prevented, it leads to irreversible changes in the lungs with complications. The disorder occurs after prolonged exposure to coal dust containing high concentration of free crystalline silica. Data in literature regarding its health impact on people working in coal mines are relatively scarce. Recently, there has been an increase in miners' pneumoconiosis, which requires a stricter policy to protect workers in the mines. There are two classical types of CWP: simple and complicated. The main diagnostic method of CWP is based on a specific X-ray finding, and the auxiliary method of choice is spirometry. The pathophysiological mechanism of CWP formation is not fully known, although it has been shown that damage to the lung parenchyma goes through three phases caused by effect of lung cells exposure to coal dust. Studies show that cytokines play an important role in inflammation and the immune response as mediators of toxic and pathogenic effects in CWP. A link between exposure to coal dust in brown coal mines and the development of CWP has also been demonstrated, with a consequent reduction in the physical and psychological quality of life of workers in the mines.
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Joksimović, Bojan, Biljana Mijović, Biljana Čančar, Milena Božinović, Zlatko Maksimović, Slobodan Stanić, and Đorđe Jevtić. "Pneumoconiosis among miners in coal mines." Биомедицинска истраживања 12, no. 2 (2021): 184–92. http://dx.doi.org/10.5937/bii2102184j.
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Pneumoconiosis of workers in brown coal mines is an occupational disease, a global public health problem and a serious disease of the lung parenchyma. If it is not prevented, it leads to irreversible changes in the lungs with complications. The disorder occurs after prolonged exposure to coal dust containing high concentration of free crystalline silica. Data in literature regarding its health impact on people working in coal mines are relatively scarce. Recently, there has been an increase in miners' pneumoconiosis, which requires a stricter policy to protect workers in the mines. There are two classical types of CWP: simple and complicated. The main diagnostic method of CWP is based on a specific X-ray finding, and the auxiliary method of choice is spirometry. The pathophysiological mechanism of CWP formation is not fully known, although it has been shown that damage to the lung parenchyma goes through three phases caused by effect of lung cells exposure to coal dust. Studies show that cytokines play an important role in inflammation and the immune response as mediators of toxic and pathogenic effects in CWP. A link between exposure to coal dust in brown coal mines and the development of CWP has also been demonstrated, with a consequent reduction in the physical and psychological quality of life of workers in the mines.
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Pach, Grzegorz, Zenon Różański, Paweł Wrona, Adam Niewiadomski, Pavel Zapletal, and Václav Zubíček. "Reversal Ventilation as a Method of Fire Hazard Mitigation in the Mines." Energies 13, no. 7 (April 6, 2020): 1755. http://dx.doi.org/10.3390/en13071755.
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Reversal ventilation is one of prevention methods against fire hazard in underground mines, but it is not recommended for the mines where methane is present. The authors introduce the new method of reversal and by conducting numerical simulations they prove that it allows to keep methane at the acceptable level during miners escape. However, it requires connection between the subnetworks of the main ventilation fans. It was also shown, that by using the method some escape routes will be shortened. It is possible to apply this method in the mines where the fans and stoppings are fully controlled across the full range of their operating parameters. The findings are important for underground mines, as well as for surface facilities where air control or smoke control is managed by two or more fans.
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Wang, Xinping, Cheng Zhang, Jun Deng, Chang Su, and Zhenzhe Gao. "Analysis of Factors Influencing Miners’ Unsafe Behaviors in Intelligent Mines using a Novel Hybrid MCDM Model." International Journal of Environmental Research and Public Health 19, no. 12 (June 16, 2022): 7368. http://dx.doi.org/10.3390/ijerph19127368.
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Coal mine accidents seriously affect people’s safety and social development, and intelligent mines have improved the production safety environment. However, safety management and miners’ work in intelligent mines face new changes and higher requirements, and the safety situation remains challenging. Therefore, exploring the key influencing factors of miners’ unsafe behaviors in intelligent mines is important. Our work focuses on (1) investigating the relationship and hierarchy of 20 factors, (2) using fuzzy theory to improve the decision-making trial and evaluation laboratory (DEMATEL) method and introducing the maximum mean de-entropy (MMDE) method to determine the unique threshold scientifically, and (3) developing a novel multi-criteria decision-making (MCDM) model to provide theoretical basis and methods for managers. The main conclusions are as follows: (1) the influence degree of government regulation, leadership attention, safety input level, safety system standardization, and dynamic supervision intensity exert the most significant influence on the others; (2) the causality of government regulation, which is the deep factor, is the highest, and self-efficacy displays the smallest causality, and it is the most sensitive compared to various other factors; (3) knowledge accumulation ability, man–machine compatibility, emergency management capability, and organizational safety culture has the highest centrality among the individual factors, device factors, management factors, and environmental factors, respectively. Thus, corresponding management measures are proposed to improve coal mine safety and miners’ occupational health.
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Gogo, Volodymy, and Boris Kobylyansky. "ANALYSIS OF ERGATIC SYSTEM FACTORS OF OCCUPATIONAL MINERS SAFETY OF UKRAINE." JOURNAL of Donetsk mining institute, no. 2 (2020): 194–205. http://dx.doi.org/10.31474/1999-981x-2020-2-194-205.
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Purpose. The purpose of the article is to form an anthropocentric ergatic system of labor safety of coal miners and to determine its main factors, factors, components and characteristics to increase the effectiveness of measures to protect their labor, especially in the deep mines of Donbas. The research methodology is based on general scientific methods of cognition – empirical (observation of real production processes, factors and factors in coal mines, description of miners ‘actions in accordance with labor protection measures, etc.) and theoretical (analysis, synthesis, generalization, classification of information on miners’ safety), as well as systematic, functional and parametric analysis of production and social processes related to the safety of miners in coal mines. The results of the study are presented in the definition and characterization of the main internal and external factors and factors as the main components in the structure of anthropocentric ergatic system of safety of miners in coal mines, which substantiates technical and organizational measures to improve the safety of miners in modern conditions. Donbas. The scientific novelty of the obtained results consists in determining the patterns and functional relationships of internal and external factors and factors of the anthropocentric ergatic system of occupational safety of coal miners and substantiation of parametric relationships to improve the efficiency of miners and further prospects for automation of production processes. The practical significance of the results of the study lies in the possibility of any coal mine to use the general structure of the anthropocentric ergatic system of labor safety of coal miners in the formation of technical, technological and organizational measures to improve the safety of miners in modern socio-economic conditions of Ukraine.
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Di, Hongxi, Shujahat Ali, and Yiming Lu. "Defining the Primary Work Stress Factors of Chinese Coal Miners—A Mixed-Methods Study." International Journal of Environmental Research and Public Health 19, no. 21 (November 7, 2022): 14593. http://dx.doi.org/10.3390/ijerph192114593.
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Background: Studies have indicated that coal miners in China have higher levels of perceived job stress. However, few studies have investigated the work stress structure of coal miners. Objective: Our study focused on the work stress of coal miners in China, with a primary aim to determine the work stress structure of coal miners in China using a mixed-methods approach. Methods: Semi-structured interviews were performed with thirty-three people (team leaders and frontline coal miners) conducted with participants from various state-owned large- and medium-sized coal mines in China. Grounded theory was used to construct an initial model for the concept of coal miners’ work stress. Using the results of this initial survey and findings in the existing literature, we then constructed a preliminary questionnaire regarding coal miners’ work stress and administered the questionnaire to 900 coal miners in the Shaanxi, Henan, Inner Mongolia, and Gansu provinces. Results: The results show that the work stress structure for coal miners differs from that for other occupational types in China, due to differences in the Chinese culture and foreign cultural influences. We revised our questionnaire based on these considerations and administered a new survey to the frontline production workers in coal mines. The preliminary questionnaires were revised and analyzed through exploratory and confirmatory factor analysis, resulting in a final formal model for work stress, which was supported by content and structural validity. Conclusion: In this research, we used the framework of grounded theory to conduct an empirical analysis of the structure model of coal miners’ work stress. The findings support that the primary work stress factors of Chinese coal miners included the stress of the work environment, job responsibility, interpersonal relationships, career development, the family environment, and organizational systems. Coal enterprises should therefore always take these factors into consideration when developing and implementing safety management policies aimed at to improve the occupational health status of coal miners.
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Działak, Paulina, Jacek Karliński, and Eugeniusz Rusiński. "Method of operator safety assessment for underground mobile mining equipment." E3S Web of Conferences 29 (2018): 00009. http://dx.doi.org/10.1051/e3sconf/20182900009.
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The paper presents a method of assessing the safety of operators of mobile mining equipment (MME), which is adapted to current and future geological and mining conditions. The authors focused on underground mines, with special consideration of copper mines (KGHM). As extraction reaches into deeper layers of the deposit it can activate natural hazards, which, thus far, have been considered unusual and whose range and intensity are different depending on the field of operation. One of the main hazards that affect work safety and can become the main barrier in the exploitation of deposits at greater depths is climate threat. The authors have analysed the phenomena which may impact the safety of MME operators, with consideration of accidents that have not yet been studied and are not covered by the current safety standards for this group of miners. An attempt was made to develop a method for assessing the safety of MME operators, which takes into account the mentioned natural hazards and which is adapted to current and future environmental conditions in underground mines.
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Pisarev, Viktor S., and Andrei A. Basargin. "METHODS OF DUST CONTROL ON OPEN-CAST MINE." Interexpo GEO-Siberia 1, no. 1 (July 8, 2020): 15–21. http://dx.doi.org/10.33764/2618-981x-2020-1-1-15-21.
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The practice of dust control on coal mines and technological roads both in Russia and abroad shows that reducing dust content, to the maximum permissible concentrations is a very difficult engineering task. To combat dust in open pit mines, various methods and techniques are used. The study of progressive dust control agents will allow normalizing sanitary and hygienic conditions at mining enterprises, and reducing the level of occupational diseases of miners. The article deals with the types of dust and the fact that a large amount of dust accompanies the processes of extraction and transportation of coal from the open-cast to the concentration plant. The experience of dust control at the enterprises of Joint Stock Company Siberian Anthracite is given.
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Nandi, Subroto, Sarang V. Dhatrak, Debasis M. Chaterjee, Umesh L. Dhumne, and Shilpa V. Ingole. "A study on morbidity profile of lignite miners in western India." International Journal of Occupational Safety and Health 5, no. 1 (February 12, 2017): 14–16. http://dx.doi.org/10.3126/ijosh.v5i1.16630.
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Background: Mining is a hazardous occupation in which workers are exposed to adverse conditions. In India, there are nine working lignite mines, producing about 30 million tons annually. The mines are located in the states of Tamilnadu, Rajasthan and Gujrat. Objective: The present study was carried out in a lignite mine in India to determine the health status of the miners. Methods: 143 workers engaged actively in mining activities were included. The health status of the employees was evaluated by well defined medical questionnaire along with pulmonary function test (PFT) and Audiometry. Result: Findings of the study showed poor literacy rate amongst the miners. Pulmonary impairment was present in 11.88% and noise induced hearing impairment in about 12.15% of the miners. Conclusion: The study findings indicate the need for regular health checkups, health education, personal protective devices and engineering control.
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Kulemin, Yu E., V. I. Minina, M. Yu Sinitsky, Ya A. Savchenko, and V. P. Volobaev. "CONDITIONS OF THE CHROMOSOMAL DAMAGE IN COAL MINERS." Hygiene and sanitation 96, no. 5 (March 27, 2019): 455–59. http://dx.doi.org/10.18821/0016-9900-2017-96-5-455-459.
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Working in coal mines, despite all achievements of modern science and technology, still remains among the most dangerous occupations to the health. The review of researches about the chromosomal damage in coal miners was performed. We searched information in the following databases - PubMed, http://www.sciencedirect.com and in the electronic library http://elibrary.ru with the use of the search strategy adopted in the Cochrane Collaboration. Inclusion criteria were: 1) randomized, controlled original researches; 2) researches performed in 1993-2016 where coal miners were the object of the study; 3) articles described chromosomal aberrations (CAs), micronuclei (MN), sister chromatid exchanges (SCE), DNA comets as biomarkers of the exposure. Exclusion criteria were other methods of the assessment of DNA damage; lack of data on the type of mines or coal mines/open-cast mines (uranium, tin, etc.); lack of access to the full text in Russian or English. As a result of the search 12 articles met selection criteria and showed a chromosomal damage in miners were selected. The results of researches performed in different countries (Russia, Turkey, Brazil, Colombia, Netherlands, Peru and India) demonstrate the increased frequency of chromosomal abnormalities in employees of coal mining industry. Damages are accumulated in cells of different types (buccal epithelium and lymphocytes) and can be detected by methods of the assessment of CAs, SCE, MN and DNA comet assay that indicating the complex basis of genotoxicants. The results of the analysis of the relationship between the cytogenetic markers, age and length of service are contradictory. The formation of occupational pulmonary diseases is accompanied by an additional induction of cytogenetic damage. In general, the analysis confirmed the high genotoxic risk of working conditions in underground as well as open-cast miners.
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Chen, Tiehua, Wenyi Hu, Jingpin Liu, and Hongxia Li. "Effect of Work Values on Miners’ Safety Behavior: The Mediating Role of Psychological Empowerment and the Moderating of Role of Safety Climate." Sustainability 14, no. 15 (August 3, 2022): 9553. http://dx.doi.org/10.3390/su14159553.
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Although numerous studies have confirmed the important influence of values on employees’ behavior, less is known about the relationship between work values and miners’ safe behavior. Based on self-verification theory and trait activation theory, this study constructed a structural equation model to explore the effect of work values on miners’ safety behavior, using psychological empowerment as a mediating variable and safety climate as a moderating variable. Data were collected from 207 miners in three coal mines in China. The model was examined using a hierarchical regression analysis and the bootstrapping method. The results showed that three types of work values significantly and positively predicted miners’ safety behavior, and psychological empowerment mediated the relationship between work values and miners’ safety behavior. However, the moderating role of safety climate was not supported. The results enrich the boundary conditions under which work values influence miners’ safety behavior and provide coal managers with intervention measures such as cultivating miners’ work values and psychological empowerment, which can improve miners’ safety behavior.
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Korotenko, Olga Yu, Egor S. Filimonov, Nikolay I. Panev, and Evgeniya V. Ulanova. "Diastolic function of the right ventricle in workers of coal mining enterprises in the South of Kuzbass." Russian Journal of Occupational Health and Industrial Ecology 61, no. 6 (August 7, 2021): 371–78. http://dx.doi.org/10.31089/1026-9428-2021-61-6-371-378.
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Introduction. Diastolic function is characterized by the earliest changes in the ventricular myocardium, rather than violations of their contractility, and can be used in the algorithm of prophylactic measures to prevent fatal cardiovascular events, including in people working at industrial enterprises. The objective of the study was to assess the indices of diastolic function of the right ventricle in workers of the coal mining industry in the South of Kuzbass. Materials and methods. Under the conditions of a periodic medical examination, we surveyed 337 people without lung diseases and coronary heart disease, of which 206 workers of coal mines in the South of Kuzbass and 131 workers of open pit mines, aged from 40 to 55 years (the average age of the miners was 46.12±0.36 years old, of the workers at open pit mines was 46.98±0.34 years, p=0.107). On the ultrasound system "Vivid E9" manufactured by General Electric, all examined persons underwent an assessment of the structural and functional state of the heart. Results. Diastolic dysfunction in the form of a decrease in the ratio of transtricuspid flows less than one was revealed in 22.5% of the miners with arterial hypertension and in 2.6% of the subjects without it (p=0.00001), in the workers of open pit mines there was in 12.3% and 8.3%, respectively (p=0.071). A decrease in the ratio of tissue Doppler flows of tricuspid annulus plane movement was detected in 89.9% of the miners with arterial hypertension and in 81.2% of the subjects without it (p=0.083), this parameter also did not differ among the workers of open pit mines (68.4% and 60.3% respectively, p=0.337), but the differences between the miners and the workers of the open pit mines turned out to be reliable (p=0.0012 in those examined with arterial hypertension, p=0.0015 - without it). Based on the conducted correlation analysis, it was revealed that the development of impaired right ventricular diastolic function in coal industry workers was influenced not only by generally accepted factors and concomitant arterial hypertension, but also by long-term work experience in underground conditions in the miners. Conclusion. The development of diastolic dysfunction of the right ventricle in miners was influenced by work experience in underground working conditions, the presence of arterial hypertension, a decrease in the longitudinal deformation of the left ventricle, a decline in the vital capacity of the lungs and impaired diastolic function of the left ventricle. Associations of right ventricular diastolic function indices with the presence of arterial hypertension, increased values of the smoker’s index, Quetelet index, waist circumference, relative wall thickness index of the left ventricle, a decrease in the longitudinal deformation of the left ventricle and forced expiratory volume in 1 second and impaired diastolic function of the left ventricle were revealed in the workers of open pit mines.
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Cheberyachko, Sergej I., Dmitrij I. Radchuk, and Oleg V. Deryugin. "The effectiveness of the miners’ respirators." Hygiene and sanitation 100, no. 2 (March 30, 2021): 129–34. http://dx.doi.org/10.47470/0016-9900-2021-100-2-129-134.
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Introduction. Dust is one of the main harmful factors in underground coal mining. The dust concentration in the coal mines remains high due to the imperfection of the used technologies, increasing the pneumoconiosis risk in miners. Respirators are the last means of protection, but information about their effectiveness is contradictory. Aim. Assess the effectiveness of individual respiratory protective devices in the coal mines. Material and methods. The protection factor (PF), the ratio of the dust concentration outside the mask to the concentration under the mask) is used to assess respirators’ effectiveness. We measured the PFs in the laboratory and the workplaces. We also measured the time the miners did not use respirators. The measurements’ results were used as input data for mathematical modeling to reduce dust load reduction. Results. The concentration of dust under the mask exceeded the Occupational Exposure Limit (OEL) in most cases. Information about the high efficiency of the negative pressure half-mask respirators (in case of continuous use) was not confirmed. The PFs measured under laboratory conditions reached 6.2, and in the workplace were from 5 to 31. The miners did not use respirators from 10 to 45% of the shift duration (15 measurements). The measurements and information on the concentration of dust in 5 mines were used to simulate the impact of the respirators’ usage on the dust load. Calculations performed by different methods, and using various programs, gave the same result. The negative pressure half-mask respirators cannot reduce the dust’s concentration in the inhaled air to the OEL even with continuous use. Conclusion. The results showed that the respirators’ usage could not prevent developing incurable pneumoconiosis in miners.
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Gorbanev, S. A., S. A. Syurin, and N. M. Frolova. "Working conditions and occupational pathology of coal miners in the Arctic." Russian Journal of Occupational Health and Industrial Ecology, no. 8 (September 25, 2019): 452–57. http://dx.doi.org/10.31089/1026-9428-2019-59-8-452-457.
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Introduction. Due to the impact of adverse working conditions and climate, workers in coal-mining enterprises in the Arctic are at increased risk of occupational diseases (OD).The aim of the study was to study the working conditions, causes, structure and prevalence of occupational diseases in miners of coal mines in the Arctic.Materials and methods. Th e data of social and hygienic monitoring “Working conditions and occupational morbidity” of the population of Vorkuta and Chukotka Autonomous District in 2007–2017 are studied.Results. It was established that in 2007–2017 years, 2,296 ODs were diagnosed for the first time in 1851 coal mines, mainly in the drifters, clearing face miners, repairmen and machinists of mining excavating machines. Most often, the ODs occurred when exposed to the severity of labor, fibrogenic aerosols and hand-arm vibration. The development of professional pathology in 98% of cases was due to design flaws of machines and mechanisms, as well as imperfections of workplaces and technological processes. Diseases of the musculoskeletal system (36.2%), respiratory organs (28.9%) and nervous system (22.5%) prevailed in the structure of professional pathology of miners of coal mines. Among the three most common nosological forms of OD were radiculopathy (32.1%), chronic bronchitis (27.7%) and mono-polyneuropathy (15.4%). In 2017, coal miners in the Arctic had a professional morbidity rate of 2.82 times higher than the national rates for coal mining.Conclusions. To preserve the health of miners of coal mining enterprises, technical measures to improve working conditions and medical interventions aimed at increasing the body’s resistance to the effects of harmful production and climatic factors are necessary.
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Işık, Ercan, Ehsan Harirchian, Enes Arkan, Fatih Avcil, and Mutlu Günay. "Structural Analysis of Five Historical Minarets in Bitlis (Turkey)." Buildings 12, no. 2 (February 2, 2022): 159. http://dx.doi.org/10.3390/buildings12020159.
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Bitlis has hosted many civilizations and is located in Turkey’s significant strategic transit corridor. Many historical structures belong to different cultures in the city. The structural analysis of five minarets mentioned in folk songs and the brand value of Bitlis city in terms of historical buildings is the subject of this study. These minarets are precious because they witness important events in Bitlis city. Non-destructive test methods determined the material properties of the Bitlis stone used in constructing minarets. Within the scope of the study, detailed information about each minaret was given, and on-site measurements determined its dimensions and current structural conditions. For each minaret, its seismic behavior has been selected by using the vertical and horizontal design spectrum in the recent earthquake code of Turkey. Historical masonry minarets were modeled using the finite element method. In addition to stress distribution in the minarets under different loading conditions, period and displacement results are also investigated.
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Li, Jing, Yong Yang, Hongmei Ge, Yong Wang, and Li Zhao. "Generative adversarial nets in laser-induced fluorescence spectrum image recognition of mine water inrush." International Journal of Distributed Sensor Networks 15, no. 10 (October 2019): 155014771988489. http://dx.doi.org/10.1177/1550147719884894.
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Water inrush occurred in mines, threatens the safety of working miners which triggers severe accidents in China. To make full use of existing distinctive hydro chemical and physical characteristics of different aquifers and different water sources, this article proposes a new water source discrimination method using laser-induced fluorescence technology and generative adversarial nets. The fluorescence spectrum from the water sample is stimulated by 405-nm lasers and improved by recursive mean filtering method to alleviate interference and auto-correlation to enhance the feature difference. Based on generative adversarial nets framework and improved spectra features, the article proposes a novel water source discrimination-generative adversarial nets model in mines to solve the problem of data limitation and improve the discrimination ability. The results show that the proposed method is an effective method to distinguish water inrush types. It provides a new idea to discriminate the sources of water inrush in mines timely and accurately.
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Schubauer-Berigan, Mary. "O2E.2 From high-dose occupational to low-dose residential exposures in radon epidemiology: how high-quality exposure assessment ties it all together." Occupational and Environmental Medicine 76, Suppl 1 (April 2019): A20.2—A20. http://dx.doi.org/10.1136/oem-2019-epi.53.
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Since the 1950s, formal epidemiologic investigations among uranium miners have yielded valuable information about lung cancer hazard from exposure to radon progeny. Early cohort studies used thousands of measurements of radon progeny in mines and a job-exposure matrix approach to assign dose estimates to miners. Over time, exposure estimation in uranium and other underground mines has become increasingly refined, making possible 25 years ago a landmark pooled study that permitted quantitative risk characterization across 11 populations of miners. More recently, case-control studies of residential radon exposure have been conducted and pooled in Europe and North America, with exposure estimation generally based on long-term, modern radon progeny measurements in the homes where subjects resided. Other research has contributed importantly to methods development related to quantifying the impact of errors in dose estimation on risk characterization. This presentation, part of a mini-symposium on the importance of exposure assessment in epidemiology for hazard identification and risk characterization, will emphasize how high quality exposure assessment methodology (and attendant uncertainties) provides the linchpin that connects these landmark studies of occupational and environmental exposure across orders of magnitude of dose.
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Haitham Kanam, Omer, and Maher Obaid Ahmed. "A review on underground mine ventilation system." Journal of Mines, Metals and Fuels 69, no. 2 (March 15, 2021): 62. http://dx.doi.org/10.18311/jmmf/2021/27334.
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In the field of mines, there are dozens of methods concerned with the optimization of ventilation system in underground mines and how bad ventilation system is playing a major effect on miners and mine’s activities. The ventilation system is considered very important because it consumed high energy of mines of total power consumption. This paper is a review of previous studies, which have been done before on design of ventilation system and its optimization methods like, using of software tools to simulate the numerical equations based on the pressure, temperature, flow rate, and other effected parameters, which are recorded by various ways of surveying. It has observed that Ventsim software is widely used because of its flexibility in dynamic simulation based on various parameters included deep, fan position and flow rate.
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Syurin, S. A., and Gennadiy A. Sorokin. "EVALUATION OF AGE AND SENIORITY DYNAMICS OF THE RISK OF HEALTH DISTURBANCES IN MINERS OF THE ARCTIC ZONE OF RUSSIA." Hygiene and sanitation 97, no. 12 (December 15, 2018): 1198–202. http://dx.doi.org/10.18821/0016-9900-2018-97-12-1198-1202.
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Introduction. Despite the improvement of technologies used in mining enterprises, most miners of the Arctic zone of Russia has harmful working conditions. However, miners’ health status is affected not only by harmful production factors, but also by severe climatic conditions of the Arctic, harmful behavioral factors (e.g. smoking), and the processes of natural aging of the organism. The aim of the study was to differentiate and hygienically assess the professional and non-professional fractions of the annual increase in risk (AIR) of chronic health disorders of miners and their comparison with officially approved hazard classes of working conditions. Material and methods. The results of a targeted periodic medical examination of 700 miners of the underground apatite-nepheline and copper-nickel mines were analyzed. 301 cases out of them, according to the developed method, were included in the studies. Two age groups and four seniority groups of workers have been formed. Results. The results of the study showed the possibility of using the criterion of AIR of chronic diseases for assessing the degree of harmfulness of working conditions based on health indices for miners in the Arctic zone of Russia, Miners have professional AIR of diseases of the musculoskeletal system, digestive organs, respiratory organs and nervous system exceeding the control levels by 2.3, 7.0, 5.0 7.0 times, respectively. Conclusion. The values of professional and non- professional factors for the risk of diseases of the musculoskeletal system and respiratory organs were drawn to almost coincide, which indicates a pronounced adverse effect of environmental factors on the health of miners in the Arctic zone of the Russian Federation.
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Nimaje, Devidas S., and Shiva Sai. "Development Of Software To Evaluate Roof Fall Risk In Bord And Pillar Method - Depillaring Phase." GeoScience Engineering 61, no. 2 (June 1, 2015): 14–22. http://dx.doi.org/10.1515/gse-2015-0014.
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Abstract Roof fall is one of the major problems of the bord and pillar coal mines during the depillaring phase. Roof fall not only causes considerable damage to the mining equipment but also to the miners. To keep in view, development of software is essential for the calculation of roof fall risk to reduce the accidents to a certain extent. In this paper, the software has been developed and tested on seam-2, the main panel of RK-5 underground coal mine, Singareni Collieries Company Limited, India and corresponding roof fall risk was calculated. The best combination of the parameters causing roof fall risk was evaluated to reduce the risk.
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Labuzova, Anastasiia, Anna Voropaieva, and Viktoriia Voropaieva. "STRUCTURE AND FUNCTIONALITY OF THE AUTOMATED SYSTEM OF MONITORING AND CONTROL OF TECHNOLOGICAL INDICATORS OF COAL MINES." Naukovyi visnyk Donetskoho natsionalnoho tekhnichnoho universytetu, no. 1-2 (2022): 63–72. http://dx.doi.org/10.31474/2415-7902-2022-1(8)-2(9)-63-72.
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underground works by providing operator control of technological processes, systems for collecting, processing and archiving information about the object. Ability to monitor vital signs and determine the location of a particular miner in real time. Methods. The communication systems used today in the coal industry have come a long way since their development. Most mines use outdated communication systems between a dispatcher and miners. Working safely in the coal industry is extremely important. The requirements for the control of data collection for observation, monitoring and exchange of information in real time should grow with the improvement of the technical capabilities of positioning systems and move to a higher level of control of individual health parameters. Results. The article analyzes the used systems and methods of positioning miners. The advantages and disadvantages of the existing systems for monitoring the technological indicators of coal mines, the optimal technology of data transmission and determining the location of an underground worker have been established. The directions of further research on improving the control of vital activity indicators, the possibility of prompt transmission of a signal to the dispatcher in the event of an emergency, and individual personalization of the miner based on RFID technologies have been determined. The practical value of the obtained results lies in the functional addition of the used systems, which allows timely and highly accurate rescue blocked miners with the possibility of tracking their condition indicators. Scientific novelty. The article offers a new functionality and structure of an automated subsystem for monitoring and controlling the technological indicators of mining pits of coal mines, which differ from the existing personal monitoring of vital indicators of workers in real time due to the use of active RFID tags embedded in separate devices. Practical importance. Improving the safety of underground works.
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Liu, Jiao, Shuang Li, Weijun Bao, and Kun Xu. "Could the Management System of Safety Partnership Change Miners’ Unsafe Behavior?" Sustainability 14, no. 20 (October 20, 2022): 13618. http://dx.doi.org/10.3390/su142013618.
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This paper analyzes the management system of safety partnership in coal mining enterprises through the methods of evolutionary game and optimized behavioral propagation of SEIR, considering the miners’ benefits and losses, as well as the influencing factors from miners and enterprises. It is found that, under the influence of the management system of safety partnership within miners, after the evolutionary game between miner partners, the behavioral strategies and personal benefits of the two miners are both consistent. Moreover, the benefits of individual miner and overall benefits of two miner partners, will affect the miners’ choice of safe behavioral strategies, as a result of which, the coal mines could improve the miners’ benefits through the management system of safety partnership to stimulate the implementation of miners’ safe behavior. Additionally, under the incentive of the management system of the safety partnership, the number of miners implementing unsafe behavior is decreasing, while the number of miners who are not easily affected by unsafe behavior is increasing. When the rewards and punishments of miners are strengthened, the propagation of miners’ safe behavior is accelerated. Finally, the propagation of miners’ safe behavior has a certain spillover effect within a certain range. The results of this paper provide a theoretical basis for the implementation of the management system of safety partnership in coal mining enterprises, which helps enterprises in guiding miners to take up safe behavior, which is better for enterprises’ safe development.
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Zhukova, Anna G., Anastasiya S. Kazitskaya, Tatyana K. Yadykina, and Tatyana D. Logunova. "Distribution of polymorphic variants of the TNF-α and TNFRSF1α genes in miners with dust lung pathology." Hygiene and sanitation 102, no. 7 (August 30, 2023): 670–74. http://dx.doi.org/10.47470/0016-9900-2023-102-7-670-674.
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Introduction. Long-term exposure to coal-rock dust on the body causes the development of systemic inflammation, one of the development mechanisms of which is an increase in the production of pro-inflammatory cytokines as follows: TNF-α, IL-1β, IL-2, IL-6. The development and course of occupational pathology were shown to depend on the individual characteristics of the body of those who works in hazardous conditions. In this regard, it is necessary to establish the significance of the polymorphism of the TNF-α and TNFRSF1α genes in the development of dust lung pathology in workers of the main occupations of the mines in the South of Kuzbass.
The aim of the study was to investigate the prevalence of polymorphic variants of the TNF-α (rs1800629) and TNFRSF1α (rs4149584) genes in miners with dust lung pathology.
Materials and methods. A survey of one hundred twenty seven miners working for a long time in the mines of the south of Kuzbass was carried out. Of these:
69 miners with prolonged exposure to high concentrations of coal-rock dust with a previously proven diagnosis of dust lung pathology, 58 miners without a proven diagnosis of dust lung pathology working in the same sanitary and hygienic conditions (control). The typing of the TNF-α (rs1800629) and TNFRSF1α (rs4149584) genes was carried out using the Real-Time method.
Results. The GG rs1800629 TNF-α genotype were shown to be a potent molecular genetic marker of the risk of developing dust lung pathology, the chance of detecting it in the group of the miners with dust pathology is almost 4 times higher than in the control group. The carriage of the A allele and the heterozygous AG rs1800629 TNF-α genotype reduce the probability of developing dust lung pathology. It has been established that the GG rs4149584 TNFRSF1α genotype can be a molecular and genetic marker of the risk of developing dust lung pathology, the chance of detecting it in the group of the miners with dust pathology is 2.6 times higher than in the control group.
Limitations. The study was limited by relatively small size of the groups under study.
Conclusion. The carriage of homozygous GG genotypes of the rs1800629 and rs4149584 polymorphic loci of the TNF-α and TNFRSF1α genes, respectively, is associated with the risk of developing dust lung pathology in miners in the South of Kuzbass. The carriage of the A allele and the heterozygous AG rs1800629 TNF-α genotype reduce the probability of developing dust lung pathology.
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Zhang, Shu, Xinyu Hua, Ganghai Huang, Xiuzhi Shi, and Dandan Li. "What Influences Miners’ Safety Risk Perception?" International Journal of Environmental Research and Public Health 19, no. 7 (March 23, 2022): 3817. http://dx.doi.org/10.3390/ijerph19073817.
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The risks faced by the mining industry have always been prominent for every walk of life in China. As the direct cause of accidents, individual unsafe behaviors are closely related to their risk perception. So, it is important to explore the factors affecting miners’ risk perception and analyze the influencing mechanisms between these factors and risk perception. The questionnaire survey method was used to collect the data of risk perception from nearly 400 respondents working in metal mines in China. Exploratory factor analysis and confirmatory factor analysis were used to analyze and process collected data. The impact of four factors affecting miners’ risk perception was verified, namely: organizational safety atmosphere, organizational trust, knowledge level, and risk communication. Then, regression analysis, Pearson correlation analysis, and structural equation model analysis were used to examine the effect of the four influencing factors on miners’ risk perception. The four influencing factors all have a positive impact on miners’ risk perception; knowledge level has the largest explained variation of miners’ risk perception, followed by risk communication. Organizational trust and organizational safety atmosphere have an indirect and positive impact on miners’ risk perception intermediated by knowledge level and risk communication. The results offer four important aspects of mine safety management to help miners establish quick and accurate risk perception, thereby reducing unsafe behaviors and avoiding accidents.
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Naveed, Muhammad Asif, and Asif Ali. "Health and Safety Information Behaviour of Coal Miners in Pakistan." Libri 71, no. 1 (January 21, 2021): 29–40. http://dx.doi.org/10.1515/libri-2019-0132.
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AbstractThis research investigated health and safety information behaviour of miners working at Makarwal Coal Mines, district Mianwali, Punjab, Pakistan. A survey method using a questionnaire was deployed for data collection from 136 coal workers. Descriptive statistics were applied for data analysis using SPSS. The results indicated that the miners’ information needs were cantered mainly on protection equipment, mining diseases, healthcare services, geological hazards, accidents associated with mining and modern mining techniques. These miners relied overwhelmingly on interpersonal relationships with fellow miners and friends for safety information followed by television and radio. A good number of the survey participants also utilized internet and social media such as Facebook, WhatsApp, etc. as information source. There was little evidence of the use of audio/visual materials, seminar/workshops, associations, government agencies, and printed materials for information acquisition. Computer illiteracy, poor financial conditions, lack of time, language barriers, lack of awareness and knowledge about safety information and non-availability of relevant materials were perceived as the major constraints in acquiring safety information. The results will not only be useful for planning a need-based information infrastructure for miners but also for policymakers, NGOs and human rights organizations working for rural development and uplifting occupational health. This research contributed in the existing research on miners’ information behaviour as only a few studies appeared.
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Liu, Xiaofei, Ping Chang, Enyuan Wang, Zhenguo Zhang, and Shuai Yang. "Numerical Study of the Respirable Coal Dust Removal Performance of a Vortex Ventilation System at an Excavation Face." Energies 11, no. 9 (September 14, 2018): 2449. http://dx.doi.org/10.3390/en11092449.
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Coal dust is one of the most serious issues in coal mines. The miners at an excavation face have a high potential for exposure to high concentrations of coal dust. The main method for removing coal dust is by ventilation. To better control the coal dust at the excavation face, it is important to understand the coal dust movement patterns and distribution characteristics. This paper used the computational fluid dynamics (CFD) approach to simulate coal dust movement under two different ventilation systems. The Eulerian-Lagrange method was used to study the gas‒solid two-phase fluid behavior. The coal dust concentration distributions under the two ventilation systems are presented and further compared. From the comparison results, it is found that a vortex ventilation system has better coal dust removal performance. This ventilation system is recommended for excavation for better coal dust control and miners’ health protection.
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Pakshyn, Maksym, Ivan Liaska, Natalia Kablak, and Halyna Yaremko. "GEODYNAMICS." GEODYNAMICS 2(31)2021, no. 2(31) (December 29, 2021): 41–52. http://dx.doi.org/10.23939/jgd2021.02.041.
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The most dangerous exogenous geological processes (EGP) in terms of the amount of damage caused to economic objects include: landslides, karst, flooding, abrasion, mudslides, etc. The distribution and intensity of EGP are determined by the peculiarities of geological and geomorphological structure of the territory, its tectonic, neotectonic and seismic regime, as well as hydrological, climatic, hydrogeological paleo- and modern conditions. Solotvynsky salt mine is one of the oldest enterprises in Transcarpathia. The field has been exploited since the Roman Empire. In 1360, a settlement of salt miners, Solotvyno, was founded on the site of the mine, which later became a center of salt production and a royal monopoly. There are a total of nine mines in the field. In 1995-1996 and 2001, floods began flooding mines. In 2005, landslides and karst abysses intensified in Solotvyno, leading to damage to residential buildings, roads and infrastructure. There was a complete flooding of the mines of two mines. Currently, dangerous natural and man-made processes are observed on the territory of the salt mine and adjacent territories. This is mainly salt karst, both underground and surface, the collapse of areas in the location of mines, as well as landslides. Therefore, the purpose of the research is to conduct a geodynamic audit of SOLOTVYNSKY SALT MINE SE and the surrounding area with the possibility of identifying areas with subsidence or rise of the earth's surface, which are gradually slowing down, accelerating or developing at a constant rate. Output data. Radar interferometry data in the period from April 30, 2016 to June 25, 2018 were used for research and performance of geodynamic audit of SOLOTVYNSKY SALT MINE SE and the adjacent territory. Modern methods of interferometric processing of satellite radar data are used in the work: the method of "PS" – the method of constant scatterers, and the method SBAS – the method of small baselines. The method of geometric leveling was used to measure vertical displacements in some places on the earth's surface in order to verify interferometric data. Monitoring of the area of interest was carried out using modern technologies of satellite radar interferometry. According to the results of observations of landslides and individual objects by space (radar interferometry) and ground (geometric leveling) methods, a high correlation of data was recorded and the presence of zones of active subsidence in the mining area was confirmed.
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Yan, Guangwei, and Dandan Feng. "Escape-Route Planning of Underground Coal Mine Based on Improved Ant Algorithm." Mathematical Problems in Engineering 2013 (2013): 1–14. http://dx.doi.org/10.1155/2013/687969.
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When a mine disaster occurs, to lessen disaster losses and improve survival chances of the trapped miners, good escape routes need to be found and used. Based on the improved ant algorithm, we proposed a new escape-route planning method of underground mines. At first, six factors which influence escape difficulty are evaluated and a weight calculation model is built to form a weighted graph of the underground tunnels. Then an improved ant algorithm is designed and used to find good escape routes. We proposed a tunnel network zoning method to improve the searching efficiency of the ant algorithm. We use max-min ant system method to optimize the meeting strategy of ants and improve the performance of the ant algorithm. In addition, when a small part of the mine tunnel network changes, the system may fix the optimal routes and avoid starting a new processing procedure. Experiments show that the proposed method can find good escape routes efficiently and can be used in the escape-route planning of large and medium underground coal mines.
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Apriani, Iin, Suharty Roslan, and Megawati Asrul Tawulo. "ETOS KERJA PEREMPUAN PENAMBANG PASIR DALAM MEMBANTU MENINGKATKAN KESEJAHTERAAN KELUARGA (Studi di Kelurahan Ulunggolaka Kecamatan Latambaga Kabupaten Kolaka)." WELL-BEING: Journal of Social Welfare 1, no. 2 (December 13, 2020): 82. http://dx.doi.org/10.52423/well-being.v1i2.16525.
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This study aims to determine the work ethics of women in the sand miners to help improve family welfare, and to find out the factors that influence the work ethics of women in the sand miners to help improve welfare. Family. This research method uses qualitative research methods with data collection techniques used are interviews, observation and documentation, data sources used are primary and secondary data sources, data analysis in this study is done with qualitative description and then analysis in accordance with power capabilities the researcher’s reason to help the researcher's conclusions. The results showed that: the work ethic possessed by women sand miners, namely: a timely attitude in which a trait or ability possessed by a person or woman who mines sand, honesty means there is a matching of words with conscience and with reality or reality, an attitude of willingness to cooperate the attitude where the individuals concerned have the same interests and awareness, and the simplicity of where to live and focus on what is really needed. As for the factors that influence the work ethic of women sand miners in Kelurahan Ulunggolaka: Religion is a value that will influence or determine the lifestyle of its adherents, Culture in which regulates so that each individual understands what must be done and to regulate human behavior in interaction , Environmental conditions which include the condition of natural resources such as land, water and where can also be interpreted into everything that is around humans, and as for the Economic Structure which is used to show the composition or composition of the economic sector in an economy. Also helps to improve family welfare where the work is done by women sand miners to meet the needs of family life.