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1)  caving coal face withπtype beam
π放工作面
1.
Aimed at the characteristics of gas gush at caving coal face withπtype beam,on the basis of anayl- izing the consitution of gas gush source,the comprehensive management measures with reasonable wind distri- bution,gas drainage of roof strike drilling holes are carried out.
富力煤矿针对π放工作面瓦斯涌出特点,在分析瓦斯涌出的来源和构成基础上,对π放工作面实施合理配风、顶板走向钻孔抽放瓦斯的综合治理措施,确保了工作面高产高效。
2)  π type caving face
π放面
3)  blasting caving face
炮放工作面
1.
28041 blasting caving face,three kinds of crossing the fault projects are established.
针对28041炮放工作面的断层情况,研究、制定了三种过断层方案,分别论述了其优缺点。
4)  fully mechanized caving face
轻放工作面
1.
The mining of fully mechanized caving face in the large-angle construction is realized.
在大角度俯采条件下,以23123轻放工作面为例,对回采过程中存在的问题进行分析,并提出解决办法,成功实现了轻放工作面的大角度俯采,并为类似地质条件的煤层开采提供了借鉴经验。
5)  fully mechanized caving face
综放工作面
1.
Analysis on the reliability of mining system of fully mechanized caving face in complex geological conditions;
复杂条件综放工作面生产系统可靠性分析
2.
Comprehensive gas control in high production and high efficient fully mechanized caving face of Tangshan mine;
唐山矿高产高效综放工作面瓦斯的综合治理
3.
Dynamic numeric simulation of coal self-ignite in goaf in fully mechanized caving face;
综放工作面采空区煤自燃过程的动态数值模拟
6)  fully mechanized top-coal caving face
综放工作面
1.
Mechanical characteristics of fully mechanized top-coal caving face and surrounding rock stress shell;
综放工作面及其围岩宏观应力壳力学特征
2.
The reliability analysis of the velocity ratio of coal cutting to support moving in fully mechanized top-coal caving face;
综放工作面采支速度比的可靠性分析
3.
Numerical simulation of distribution regularities of dust concentration in fully mechanized top-coal caving face;
综放工作面粉尘浓度分布规律的数值模拟
补充资料:π, π-conjugation
分子式:
CAS号:

性质:单键和双键相互交替排列的共轭体系。最简单的为1,3-丁二烯,而苯分子则是一个具有高度对称结构的闭合共轭体系。除碳碳双键外,碳碳叁键、碳氧双键等,都可组成π,π-共轭。例如:CH2=CH—C≡CH;CH2=CH—CH=O。由π,π-共轭引起的使分子内能降低、键长发生平均化等电子效应,称为π,π-共轭效应。

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