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- density of coal seam 煤层密度
- Research on coal bedding structure is the theory foundation and precondition of coal seam gas exploitation. 煤体层理结构的研究是煤层气开发开采的理论基础和前提条件。
- The authors used the Analytic Hierarchy Process(AHP) in the researches of coal seam floor water-irruption. 将系统工程中的层次分析法引入煤层底板突水的研究中。
- The reserves of thin coal seam shearer and the developing trend of coal seam shearer of our country are analysed. 分析我国薄煤层储量以及薄煤层采煤机的发展状况及趋势。
- Exploration evaluation coal seam gas is a base of coal seam gas exploration and developing. 煤层气的勘探评价,是开展煤层气勘探与开发工作的基础。
- It is shown that the viscosity of Coal Water Slurry is mainly affected by the density of minerals.While the surface properties of minerals can product impact on CWS. 结果表明,难溶性矿物的密度是影响CWS体系黏度的主要因素,同时还需考虑矿物表面的性质。
- The test results show that the drawing interval of 1.5 m is helpful for controlling dead-unconsolidated thin sandstone of coal seam roof and reduce sand ratio of drawn top-coal. 试验结果表明，放煤步距采用三采一放有利于控制顶板极松散细砂岩，降低放出顶煤的含砂率。
- An inversive research method was proposed through analyzing the complicated changing features of permeability of coal seam and the problems existing in actual measurement. 分析了煤层渗透率的复杂变化特点和实际测量上存在的问题，提出其反演方法。
- The density of population in this city is very high. 这个城市的人口密度非常高。
- The skeletal density of four kinds of coal in different rank is determined by atomic distribution function of wide angle x-ray diffraction spectrum (WAXS) and a common method using hydrometer. 用x射线广角衍射原子分布函数方法测试了不同煤化程度煤的真密度，并与按常规方法（国家标准）测定的结果进行了对比。
- The development of this compound technique of perforating in fracturing blasting of coal seam showed a very promising applicable future. 该技术在煤层致裂爆破以及其他领域的多方向发展,具有良好的应用前景。
- Based on analysis of sedimentary facies of coal measures in Tiefa mining area, the erosion zones in the coal seam No.4 in Dalong mining area ar... 在对铁法矿区煤系沉积相分析的基础上,利用煤层顶板砂体等厚图对大隆井田4%23煤层中的冲刷带进行了预测;揭示了铁法矿区煤层冲刷带的总体分布规律。
- The area had a population density of five people per square mile. 该地区人口密度为每平方英里五人。
- It used draining while mining and light &middle pressure water injection in coal seam, those completely eliminated the danger of coal and gas outburst. 在生产过程中，采用边采边抽和浅孔中压注水措施，完全消除了工作面的突出危险性。
- The AVO responses of coal of different structures are considerably different.Both intercept and gradient on the coalbed top interface increase with the density of cleats and fractures increasing. 不同结构煤体在AVO响应上存在明显的差异，随著煤层割理裂隙发育程度的增强，煤层顶面AVO的截距和梯度都会增大；
- The inversive calculation result showed that the permeability coefficient of coal seam and its changing condition can be determined by seam gas Pressure. 算例反演的结果表明，利用反演方法能够通过煤层瓦斯压力确定煤层的透气性系数及其变化状况。
- Do you know the density of population in this area? 你知道这个地区的人口密度吗?
- We need to replenish our stocks of coal. 我们需要再次补充煤的储备。
- The article analyzes the cause of coal and gas outburst in heading face and introduces ways,control gas outburst in heading faces with three-soft coal seam. 分析了煤巷掘进头发生煤与瓦斯突出的原因,介绍了“三软”煤层高突区域煤巷掘进头瓦斯综合治理的途径和措施。
