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Supporting problems at an island mining face in shanxi, China. Case study based on field observation

Abstract

In this paper, field observation is conducted in Fujiaao Coal Mine, Linfen city in Shanxi province, China, which is unique because of its island-typed mining layout. Firstly, geology, layout of the coal cutting face, supporting pattern are presented and details are also provided. Then the problems are discussed and analyzed based on existing bolting theories. It finds out the length of the cable bolt is too long, which requires long time to drill boreholes, whilst the effectiveness is limited due to the illogical combination between cable bolt function zone and rock bolt function zone. Also, the face place allocated to rock bolt is very likely to cause line contact between its edge and steel belt, thus the bearing force is tremendously weakened and solely determined by strength of belt. Furthermore, field observation proves the low active supporting effects to roof, thus leading obvious roof sink even without the disturbance of mining activity. Eventually, some solutions are proposed with the intention to improve the situation based on the economic and technical considerations, including bolting in humidity environment, rational cable bolt length, wise choice of face plate, and ways to increase pretension force. The viewpoints and comments of this study can be referred by practitioners in coal mines sharing same difficulties.

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Methods of enlarging material to the concentration table

Abstract

Concentration tables are one of the oldest oscillatory enrichments with over 100 years of tradition. On this type of distribution tables are made according to material mass in many recurring cycles induced by appropriate drives. So-called wet tables are the devices most often used for coal enrichment in Polish mines because this process generates very high costs, high water consumption and pollution of the environment, as well as the need for, among others, water and mud management is increasingly being replaced mainly in areas poor in water by the modern model of the air concentration table – FGX produced in China. The process of enrichment on this type of table itself runs in a manner comparable to the method of wet enrichment with the difference that the FGX is distributed on a perforated plate, in this case we deal with air pollution. Department of Machinery Engineering and Transport's attempts to use the differences in coefficients of friction in over-resonance screens have shown that it is possible effective separation of grains with different coefficients of friction. The article presents a theoretical analysis and presents the results of performed dry enrichment trials using different coefficients of friction. The summary presents the advantages of using the enrichment method using the differences in friction coefficients and test results.

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Smart solutions for improving working processes. A research experiences from dental clinic

-89 Swan, J., Scarbrough, H., Preston, J. (1999). Knowledge management: The next fad to forget people? 7th European Conference on Information Systems, Copenhagen, Denmark. Zhao J., Ordóñez de Pablos, P., Qi, Z. (2012). Enterprise knowledge management model based on China’s practice and case study. Computers in Human Behavior 28, 324-330.

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Evaluation of Noise Level at the Position of Water Cutter Operator at Selected Enterprise

Germany. Acta Acustica united with Acustica, Volume 104, Issue 5, pp. 733-736. User manual SoundTest-Master Wang, X.M., Wu, H., Jiao, J., Li, Y.H., Zhang, Z.R., Zhou, W.H., Yu, S.F. (2016). Influencing factors for hearing loss in workers exposed to noise in a cement plant. Chinese journal of industrial hygiene and occupational diseases, Volume 34, Issue 12, pp. 895-899. Working conditions in 2018 Statistics Poland Wu, S.S., Yu, J.N., He, C.H., Mu, H.X., Wang, C., Zhang, Y., Zhang, C.Y., Yu, S.F., Li, X.L. (2016). Current status of hearing loss

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Application of Selected Methods and Approaches for Improvement of Processes and their Use in Practice in Companies of Wood Processing Industry in Slovakia

. [9] G. Jacobson, N. McCoin, R. Lescallette, S. Russ, C Slovis. Kaizen: A method of process improvement in the emergency department. Academy Emergency Medicine 16 (12): 2009, pp. 1341-1349. [10] Z. Lin, Z. Yu, L. Zhang, Performance outcomes of balanced scorecard application in hospital administration in China. China Economic Review 30, 2014, pp. 1-15. [11] R. Lueg, Strategy maps: the essential link between the balanced scorecard and action. Journal of Business Strategy 36, 2015. pp. 34-40. [12] P. M. Madhani. Six Sigma Deployment in Sales and

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Effect of FSW welding parameters on the tensile strength of aluminum alloys

). Microstructure and mechanical properties of dissimilar Al−Cu joints by friction stir welding. Trans. Nonferrous Met. Soc. China. (2014)1779−1786. [7] Palanivel, R., Mathews, Koshy, P.,, Murugan, N ., (2010). Influences of tool pin profile on the mechanical and metallurgical proprieties of friction Stir welding dissimilar aluminum alloy, International Journal of Engineering Science and Technology, (2010). 2109-2115. [8] Fisher, R, The design of experiments . Oliver and Boyd 1935. [9] Tanaka, T., Morishige, T., and Hirata,T.. Comprehensive analysis of

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Food Safety as a Key Factor in the Supply Chain

). Information asymmetry and traceability incentives for food safety. International Journal of Production Economics 139, p. 596-603. Rong, A. and M. Grunow. (2010). A methodology for controlling dispersion in food production and distribution. OR Spectrum 32, p. 957-978. Roth, A.V., A.A. Tsay, M.E. Pullman and J.V. Gray. (2008). Unraveling the food supply chain: strategic insights from china and the 2007 recalls. Journal of Supply Chain Management 44, p. 22-39. Sloane, A. and S. O’Reilly. (2013). The emergence of supply network ecosystems: a social network

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Analysis of Selected Aspects of Knowledge Management in the Context of Their Impact on the Quality Level in Metallurgical Enterprises

. Knowledge Sharing in Teams: Social Capital, Extrinsic Incentives, and Team Innovation, Group and Organization Management, 39(2), 213–243. https://doi.org/10.1177/1059601114520969 Huang, Q., Davison, R.M., Gu, J., 2011. The impact of trust, guanxi orientation and face on the intention of Chinese employees and managers to engage in peer-to-peer tacit and explicit knowledge sharing, Information Systems Journal, 21, 559-562. Hung, R. Y., Lien, B., Ya-Hui, McLean, G. N., (2009). Knowledge management initiatives, organizational process alignment, social capital and

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