Spontaneous combustion of coal is one of the most horrifying hazards in coal industries, especially in underground coal mines. Thus having a prior knowledge about the occurrence of this phenomenon in underground coal mines is of crucial importance in preventing this process, loss of life, huge economic loss, and environmental pollution. The aim of this work is to determine the spontaneous combu...

Abstract Shallow coal seam with thick soil layer is widely reserved in the Jurassic Coalfield, Western China, mining-induced subsidence represents complex characteristics. Combining physical simulation, theoretical analysis and in-situ observation, overburden strata structure dip direction were revealed, prediction models established, based on this, equations of ground surface proposed. The res...

BACKGROUND To evaluate the usefulness of the modified lateral pillar classification as a prognostic factor in Legg-Calvé-Perthes disease (LCPD). METHODS Thirty nine patients diagnosed with lateral pillar C in LCPD from May, 1977, to October, 2001 were reviewed, and their skeletal maturity was followed. The mean follow up duration was 12 years and 7 months (4 years, 6 months to 24 years, 9 mon...

Protective coal pillars in underground mining are technological losses the technology of extracting at Angren deposit. During mine operation, a significant part remains space. Extracting them is not possible with traditional energy-mechanical technologies. The paper considers new extraction -energy-heat unmanned brown energy from space spent fields. research results on experimental sites combus...

The deformation control of roadways surrounded by rock in the fully mechanized amplification sections extra-thick coal seams is problematic. To analyze failure and characteristics a support frame, as well processes surrounding rock, through theoretical analysis industrial tests, conditions return airway caving face an seam Yangchangwan Coal Mine, Ningdong mining, area were examined. Combined wi...

The western mining areas of China, which are rich in coal resources, lack water resources. Large-scale and high-intensity China’s has led to the loss groundwater Underground reservoirs mines an effective means achieving protection utilization resources these areas. One important standards for safety underground reservoir a mine involves checking whether development cracks pillar dam body, under...

In multi-seam mining, the residual coal pillar (RCP) in upper gob has an important influence on layout of roadway lower seam. At present, few papers have studied characteristics surrounding rock gob-side entry driving (GED) with different widths under RCP. This research contributes to improving recovery rate extra-thick seam this condition. The main contents were as follows: (1) mechanical para...

We have synthesized a pillar[6]arene in high yield and a co-pillar[6]arene using chlorocyclohexane as a solvent.

As a tool for exploration of concealed coal seams by modern techniques, determination of the depth of erosion of coal seams with reference to the surface of angular unconformity underlying the remnants of a key bed is conducted for the first time in coal mines of Kerman region. The angular unconformity surface (the initial surface exposure of coal seams) separates the coal seams of Jurassic age...