Coal mining

Workers in underground coal mines are always at risk of heat shock due to high temperatures and narrow spaces. To reduce the temperature in the longwall faces, some mines have used air conditioners to increase the cooling capacity, creating a better working environment for miners

10p vijiraiya 19-05-2025 2 1   Download

The article presents the current status of technological innovation in underground coal mining of Dong Bac Corporation. The primary research subject is the semi-mechanized longwall face I-6-2 at Bac Quang Loi coal mine of Company 790, Dong Bac Corporation.

10p viyamanaka 06-02-2025 3 2   Download

Studying, analyzing and evaluating the basic factors affecting the wear resistance of the shear cutting drum, such as coal strength, the geometry of the cutting teeth, materials of cutting teeth, the cutting angle. Cutting depth, cutting feed and cutting speed are the basis for selecting the appropriate factors in fabrication, using the cutting teeth of the shearer.

27p closefriend09 16-11-2021 25 2   Download

Build a feasible and scientific basis for the contents of inovation of planification of coal mining companies in Vinacomin in the current context.

27p trinhthamhodang1217 14-01-2021 30 4   Download

Building basis of science and reality for economic - technical efficiency of PE using solutions in CM in Quang Ninh area, to make contribution to increase efficiency of coal production and coal business.

27p cothumenhmong6 17-07-2020 38 4   Download

The PhD thesis studies the theoretical and practical issues of fixed asset accounting in coal mining enterprises of Vinacomin. In particular, the thesis focuses on studying the principles of measuring, recording, presenting and providing information on fixed assets as well as the method to collect, process, analyze and provide information in respond to requirements of fixed asset management. The thesis studies the application of these principles in the practice of fixed asset accounting in Vinacomin's coal mining enterprises.

32p dungmaithuy 18-09-2019 27 3   Download

The rapid economic growth in Vietnam has resulted in an increasing demand for electricity. This in turn translates to a higher rate of coal resource extraction and consequent rise in pollution of water and land resources. This study estimated the environmental costs associated with the electricity demand requirements of the coal electricity sector, as a component of the long-run marginal opportunity cost (LR-MOC) of electricity production.

0p hailedangbs 02-05-2013 102 25   Download

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Selected physical properties of initial soils on the outside spoil bank of the Bełchatów brown coal mine...

6p toshiba3 09-09-2011 42 4   Download