Results 71 to 80 of about 18,724 (162)
Critical technologies and geology-engineering integration practices for deep CBM production in the Yanchuannan CBM field [PDF]
Objective and Methods This study introduces the adjustments for coalbed methane (CBM) production in the Yanchuannan CBM field‒the first deep CBM field in China.
Bin CUI +6 more
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Topography characteristics and profile type of China offshore submarine [PDF]
, 2014 基于国家海洋局“908“专项的最新海底地形资料,分析中国近海海底地形特征及其影响因素。中国近岸海底地形继承了陆地地形西北向东南倾斜的趋势,海底地形坡降为0.2‰~1.6‰,平均坡降约0.8‰,等深线基本平行于海岸展布,河口区呈舌状向海展布。海底地形受构造控制作用明显,呈两窿两坳的南、北分带特征,并在不同沉积环境和复杂水动力条件下塑造出沉降盆地型、挤压隆起型、沉积改造型和过渡型等4种类型。沉降盆地型和挤压隆起型地形起伏小,沉积物以细粒为主,水流方向单一,易发育海湾堆积平原和水下堆积岸坡等堆积型地貌 ...
卢惠泉 +6 more
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A key technology for synergistic backfilling of coal-based solid waste and high-salinity wastewater [PDF]
Background and Objective Limited by locations, as well as economic and technical levels, most of the coal-based solid waste is still accumulated in the form of open-air landfills without treatment, thus occupying large quantities of land resources and ...
Boqiang WU +9 more
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Gaoya dianqi, 2017 快速直流断路器是切除直流电网故障必不可少的设备,而其开断容量难以达到直流电网的要求,通过限流器和断路器的配合能够有效提升断路器的开断能力,从而确保直流电网安全运行。文中在深入开展快速机械断路器的特性的基础上,对断路器与直流限流器的配合问题进行研究:首先,分析机械断路器的开断原理,通过MATLAB/Simulink建立直流断路器电弧特性仿真模型;然后,根据直流电网电压等级、开断电流大小和开断时间等不同要求,研究限流器对断路器开断时间、开断瞬间峰值电压的影响,仿真分析与之相匹配的限流类型及其参数值优化方法 ...
张翀, 张轩, 张志丰
doaj
Research progress of support theory and technology of the roadway surrounding rock based on the plastic zone control [PDF]
With the increasing depth of coal mining, the stability control of surrounding rock in deep roadway has become one of major problems in the mining field, and the effect of surrounding rock control in deep roadway is directly related to the safe ...
Lei FAN +3 more
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Gaoya dianqi, 1982 《高压电器》一书的基本内容为:电力系统的开断与关合过程;各种高压断路器（油断路器、压缩空气断路器、SF6断路器、真空断路器）的结构、工作原理、性能分析及部分设计的计算;其他高压电器（熔断器、隔离开关、接地开关、负荷开关、互感器、组合电器等）的介绍 ...
刘绍峻
doaj
Research progress,key scientific issues,and prospects of segmented fracturing and pressure relief gas drainage technology for coal seam roof horizontal wells [PDF]
The segmented fracturing and pressure relief gas drainage technology in the horizontal well of the coal seam roof is a key means to guide the efficient gas extraction in deep, high gas, soft and low permeability coal seams.Based on this, a full lifecycle
Caiqing LI +7 more
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Gaoya dianqi短路电流相控快速开断技术可以有效缩短开断的燃弧时间从而提升真空断路器的性能，文中通过研究分闸速度对双断口快速真空断路器短路电流开断短燃弧时间的影响规律，为双断口快速真空断路器相控短燃弧开断提供理论依据。文中实验采用2台12 kV快速真空断路器以及驱动控制系统，搭建了快速真空断路器短路电流短燃弧开断合成实验回路系统，得到了双断口短燃弧时间及临界熄弧开距与分闸速度关系曲线。实验结果表明，双断口短路电流开断短燃弧时间和临界熄弧开距随分闸速度的增加而单调下降。
李秀广 +7 more
doaj
Gaoya dianqi, 1996 以人工过零法进行了用ZN3—10/600—150型、ZN4—10/1000—200型和ZN—10/1000—300型高压交流真空断路器单个灭弧室成功地开断8、11和15.5kA直流电流,以及用两台ZN4—10/1000—200型断路器灭弧室两串三并开断直流电路,最高开断参数达25.8kA、26.7kV的试验。对具有纵向磁场的ZNN—10型（暂）真空断路器,在固定开断电路参数的条件下,进行了单个灭弧室连续开断直流电路的试验,为50kA、30kV高压直流断路器的建造奠定了试验基础。
郭增基, 刘彦琴, 郭祥玉
doaj
, 2006 法律的发展历了“神本”(即“以神为本”)、“物本”(即“以物为本”)和“社本”(即“以社会为本”)三个阶段,“人本”(即“以人为本”)是法律的发展方向。人格、人性、人权是“人本”法律观的基本范畴。人及人组成的社会是法律展开的场域,人是法律的主体,人的幸福是法律的目的。公民意识的塑造,权利本位的立法,职业共同体人文精神的培养是实现“人本 ...
刘连泰 +1 more
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