1) low permeability outburst coal seam
低透气性突出煤层
1.
Study on the roadway excavation rapidly in the low permeability outburst coal seam;
低透气性突出煤层巷道快速掘进的试验研究
2) the low gas permeability coal seam
低透气性煤层
1.
This paper based on the low gas permeability coal seam 416 stope working face of Tongchuan mineral bureau,we analyzed the mechanism of the hydraulic cutting seam to improve the gas permeability coal seam,by this study,it shows the hydraulic cutting seam technology is effectual measure and it is provided with nicer practically and capacious foreground.
文章以铜川矿务局陈家山煤矿低透气性416综放工作面为研究背景,深入研究了水力割缝增强煤层透气性的作用机理,试验表明了水力割缝的确是一种提高低透气性煤层瓦斯抽放的有效措施,并具有良好的实用性和广阔的推广前景。
3) low air permeability coal seam
低透气性煤层
1.
Using RFPA2D-Flow stereo-gasses coupled system to simulate the process of gas draiange in lower air permeability coal seam by loose blasting,it interprets that loose blasting is a effective ways to increase air permeability in low air permeability coal seam.
运用RFPA2D-Flow固气耦合系统模拟了松动爆破抽放低透气性煤层内瓦斯的过程,解释了爆破松动是增加低透气性煤层透气性的有效途径,本文对松动爆破前后抽放过程中煤层内瓦斯压力和瓦斯渗流场的变化规律进行了数值模拟对比,为进一步理解瓦斯抽放、松动爆破增透机理等提供理论基础和科学依据。
5) coal seam with low gas permeability
低透性煤层
1.
Gas drainage in high gassy coal seam with low gas permeability is always an hard solved significant technology problem in the process of safety production.
高瓦斯低透性煤层的瓦斯抽放,一直是煤矿安全生产过程中的重大技术难题。
6) high gassy and low permeability coal seam
高瓦斯低透气性煤层
1.
A new damage model was built for explosive for LS-DYNA3D by taking advantage of Taylor method aimed at the high gassy and low permeability coal seam,and the deep-hole presplitting explosion was numerical simulated.
针对高瓦斯低透气性煤层,采用Taylor方法建立了一个新的LS-DYNA3D爆破损伤模型,对深孔预裂爆破进行了数值模拟研究,再现了爆破过程中,动压冲击震裂、应力波传播与叠加以及爆生气体驱动裂纹扩展的整个过程,分析了爆破孔间距对爆生裂纹和爆破增透效果的影响,提出了高瓦斯低透气性煤层深孔预裂爆破的合理间距为5-6 m,为高瓦斯低透气性煤层的瓦斯抽放提出了解决方案。
2.
It is difficult to conduct gas drainage in a high gassy and low permeability coal seam.
为了解决高瓦斯低透气性煤层的瓦斯抽放难题,利用数值模拟和现场测试相结合的方法,研究了深孔预裂爆破技术对高瓦斯低透气性煤层的卸压增透效果。
补充资料：低促性腺激素性性功能低下
低促性腺激素性性功能低下
指女孩由于缺乏促性腺激素释放激素(GnRH)分泌，使促卵泡素(FSH)和黄体生成素(LH)分泌不足所引起的性征不发育。其原因可能为中枢神经系统疾病，如感染损伤，肿瘤，或先天缺陷；可能为单一促性腺激素缺乏，特发垂体功能低下矮小症，功能性促性腺激素缺乏等。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条