1) periodic air pressure oscillation
周期变压
1.
The influence of periodic air pressure oscillation on xylanase activities was investigated during the course of solid state fermentation of An 1 15.
同时研究了周期变压操作对固态发酵过程中黑曲霉产酶的影响。
2) Periodicly varying pressure and oxygen
周期变压和周期供氧
3) Short-period atmospheric pressure variation
短周期气压变化
4) barometric non-periodic changes
气压非周期变动
5) 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。
6) 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。
补充资料：安全隔离变压器
分子式：
CAS号：
性质：安全电压的电源装置。其额定容量，单相变压器不得超过10kVA，三相变压器不得超过16VA。安全隔离变压器的一次与二次应有良好的绝缘、其间还可用接地的屏蔽隔离开来。
CAS号：
性质：安全电压的电源装置。其额定容量，单相变压器不得超过10kVA，三相变压器不得超过16VA。安全隔离变压器的一次与二次应有良好的绝缘、其间还可用接地的屏蔽隔离开来。
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