Due to the increasing efforts on saving our natural environment a change in the structure of energy resources can be observed an increasing fraction of a renewable energy sources. In many countries traditional underground coal mining loses its significance but there are still countries, like Poland or Germany, in which the coal based technologies have the greatest fraction in a total energy pro...

In view of the severe ground pressure behavior and spontaneous combustion risk goaf in fully mechanized top coal caving face with deep buried weak cohesive roof thick seam prone to combustion, combined theoretical analysis mining overburden structure field engineering practice, structural characteristics rock strata law are studied. The results show that: stope also has phenomenon surface step ...

Accurate and efficient acquisition of information about the dynamic characteristics of coalface overburden can provide an important theoretical basis for green mining in coal producing regions in western China. In this study, a novel method for comprehensively detecting the dynamic behavior of coalface overburden is proposed in order to address deficiencies of the existing detection methods. Th...

A miniature electrostatic thruster is being developed in Low Temperature Co-fired Ceramic (LTCC) at Boise State University. The thruster is composed of an antenna to create the plasma, a cylinder to contain the plasma, and grids to extract the plasma beam at high velocity. In this work, the development of the inductively coupled plasma (ICP) antenna in LTCC will be presented. This antenna is fa...

This paper presents the engineering geological properties and roof control tecnology for a thick coal seam fully-mechanized face mining with hard roof conditions (THC) at the Jinhuagong Coal Mine (JCM), northwest China. The effective support working resistance and appropriate roof control technology are two critical factors for safe and productive mining in the THC. The load-estimate-method (LO...

Fully mechanized top-coal caving mining with high height, hard roofs and strong pressure are popular in the Shendong area, China. The occurrence of dynamic disasters, such as rock burst, coal gas outburst, mine earthquakes goaf hurricanes during exploitation process under roof conditions, pose a threat to safe production mines. In this study, characteristics overburden fracture fully height stu...

The following article analyzes the effectiveness of directional hydraulic fracturing (DHF) as a method rock burst prevention, used in black coal mining with longwall system. In order to define changes seismic activity due DHF at “Rydułtowy” Black Coal Mine (Upper Silesia, Poland), observations were made regarding mass during system using roof layers collapse. was recorded area itself, where, on...