Based on the characteristics of the top coal thickness of the fully mechanized caving in special thick coal seam,the long distance of coal gangue caving,as well
In the flotation process,bubble is a key factor in studying bubble-particle interaction and fine particle flotation.Knowledge on size distribution of bubbles in
<正> 进入八十年代以来,对等贸易(Counter trade,亦称反向贸易)又有了新的发展,增长的势头持续不衰。从地域上来看,不仅东西方、南北方贸易采用这种方式,就连发达国家之间也在开展对等贸易。1972年仅有12个国家和地区进行对等贸易。1983年已达88个国家和地区,其中就有14个是发达国家。从商品和贸易结构来看,对等贸易既适用于机械设备、制成品和初级产品,也适用于高技术产品。尤其是,这种贸易方式突破了传统的商品贸易的局
Based upon characteristic movement features of the overlying strata in solid backfill mining and in-situ observations,an associated model representing a roadway
In order to analyze the origin of carbon monoxide（CO） in coal seams, stress–strain experiments under temperature of 50, 150 and 250 °C were conducted using
它是粉碎处理的一个确定的事实，压碎并且磨擦，最多于全部的精力的一半说明的集中的进程在矿物质工业消费了的精力。各种各样的其他的预告的处理方法被专家在地球附近试试。尽管
This paper analyzes the control mechanism of coal and gas outbursts and proposes the concept of an effective pressure relief protection range, based on the stre
The heat How generated from the infinite rock mass surrounding the underground tunnels is a major cause for the increasing cooling demands in deep mine tunnels.
In the eastern Ordos basin, due to the diversity of the tectonic setting, coal rank, gas content and permeability, coal reservoirs have differing characteristic
Based on the technology of controlling surrounding rock deformation by constructing concrete pillars in large section finishing cut in backfill coal mining, the