1)periodic weighting周期来压
1.When working face advance is more 30 meters each time,main roof has a periodic weighting.当工作面推进到60 m左右,老顶出现初次破断,形成初次来压,之后工作面每推进30 m,老顶出现周期来压。
英文短句/例句
1.Periodic weighting was analysed by the bearing wedge model, simultaneity, the mechanics of first weighting and periodic weighting were expounded.利用承压砌块模型分析了周期来压过程,并给出了初次来压和周期来压机理。
2.Wu 8 seam roof cycle hard to pressure on the impact of gas emission and response坚硬顶板周期来压对瓦斯涌出的影响与对策
3.Relationship between Periodic Roof Weighting and Gas Emission from Stopping Area顶板周期来压与采场瓦斯涌出的关系研究
4.Assess pressure ulcer and surrounding skin to determine ulcer stage.评估压疮及周围皮肤，确定压疮分期。
5.The engine cycle during which this process occurs.上述机器压缩过程的周期.
6.This negative pressure phase is of short duration.负压周期的延续时间很短。
7.Research on Optimum Operating Cycle of Chamber Type Diaphragm Filter Press;厢式隔膜压滤机最佳操作周期的研究
8.The Research of Flicker Measure on Approximate Periodicity Voltage Fluctuation;近似周期性电压波动的闪变测量研究
9.Maintenance Period Study about the Track Excavator Hydraulic System;履带式挖掘机液压系统维修周期研究
10.A Large Ratio Data Compression Method for Power System Periodical Signals电力系统周期性数据大比率压缩算法
11.The RL Series Circuit Excited by the Non-sine Periodic Voltage非正弦周期电压作用下的RL串联电路
12.A periodical containing literary abridgments or other condensed works.周期文摘收集的文学作品节本或其它压缩品周期刊物
13.The Effects of Hyperbaric Oxygen Induced Cell Cycle or Combined with Chemotherapy on the Proliferation of Colon Adenocarcinoma Cells;高压氧对结肠腺癌细胞周期及细胞周期特异性药物作用的影响
14.Tunable Long Period Fiber Gratings Based on Periodic Rectangular Pressure Grooves基于周期性矩形压力槽的可调谐长周期光纤光栅(英文)
15.Come back again next week for the results and another check of your blood pressure.一周后来复诊看化验结果和复查血压。
16.For many people Saturday night is the highpoint of the weekend and the week.对许多人来说，星期六晚上是一周和周末的高潮。
17.The Differences between Zhou Enlai and Zhon fohai as Students of Hajime Kawakami;周恩来与周佛海同期师学河上肇之差异
18.endogenous business-cycle theory以内在因素来解释产业周期的理论
相关短句/例句
periodical pressure周期来压
1.it obtained the rule of strata behaviors of the working face, and analyzed the periodical pressure arose from periodical break occurred in nether roof, and explained mechanical principle of the road retained for next sublevel, the technical measures of strata control under this condition are put forward .根据广西呼略矿不稳定煤层倾斜长壁开采的工业性试验,以及矿压观测成果,得出了工作面的矿压显现规律,分析了由直接顶周期性断裂而引起采场的周期来压现象,阐述了沿空成巷的力学原理,提出了在这种开采条件下岩层控制的技术措施。
2.With the study on the moving law of the surrounding rocks in the seam mining processing of the fully mechanized coal mining face in 4-2 seam of Fengshuigou Mine,the paper understood the initial pressure and the periodical pressure distance of the 4-2 seam roof pressure,the support strength of the hydraulic supports in the coal mining face,the stress variation and stress a.综采工作面矿压显现规律对矿山生产实践具有深刻的指导意义,文章通过对石场煤矿4-2煤层综采工作面围岩在煤层开采过程中的移动规律进行研究,掌握了4-2煤层顶板初次来压和周期来压步距、工作面支架支护强度、围岩破坏活动过程煤壁中应力变化大小和应力影响范围。
3)Periodic weighting length周期来压步距
4)periodic weighting of the main roof老顶周期来压
5)periodic pressure strength周期来压强度
6)periodic roof weighting顶板周期来压
1.The relationship between periodic roof weighting and gas emission from stopping area was studied by monitoring on site.通过现场监测研究了顶板周期来压与采场瓦斯涌出变化之间的关系,并对工作面超前支承压力变化和采空区老顶垮落对瓦斯流动的影响进行了分析。
延伸阅读
冲击波超压与动压
[解释]： 核爆炸产生的高温、高压火球膨胀，在周围介质中形成连续向外传播的压力脉冲（或冲击波），冲击波阵面传播到空间某点时，超过周围环境大器的压力称超压；空气粒子高速随波阵面运动产生的冲击压力称动压。超压和动压都以帕斯卡（Ｐａ）为主单位。超压随时间的变化取决于爆炸威力、距爆点的距离和爆心周围的介质情况。特定地点的峰值超压一般出现在冲击波阵面到达该点的瞬间，超压在该点的持续时间称为正压作用时间。尔后，该点的压力下降到低于周围压力，称为负压，再逐渐回升到周围压力值。对人员的直接冲击伤，超压为２０—２９千帕可引器轻度伤；２９—５９千帕可导致中度伤；５９—９８千帕可造成重度伤；大于９８千帕可造成极重度伤。动压为１０—２０千帕可造成中度伤；２０—３９千帕可造成重度伤；大于３９千帕可造成极重度伤。动压的推动、抛掷和超压的挤压会造成物体变形和毁坏。
