Testing research of coal layer safe extraction in efflorescent oxygenized belts 风氧化带内煤层安全开采的试验研究
2.
The following new opinions : without caving zone coal layer extraction in efflorescent oxygenized belts ; two effects of blocking water and preventing water flowing fractured zone from going on developing after mining effect ; appropriately enlarging the extraction thickness were presented 提出了风氧化带煤层开采无垮落带；受采动影响后，具阻水和抑制导水裂隙带继续发展的双重作用以及适当加大开采厚度等新观点。
3.
Based on testing data in worksite and engineering practice , the strata damage movement characteristics , rock properties of weathered zone and qualitative and quantitative analysis of the mechanism of coal layer safety extraction in efflorescent oxygenized belts were discussed 摘要根据现场观测和工程实践，论述了风氧化带内煤层开采时，覆岩破坏移动特征，风化带岩石属性和风氧化带内煤层安全开采机理的定性、定量分析。
4.
But the grain growth , grain semiconduction and grain boundary insulation were influenced by many factors , such as the type and contents of dopants , sintering temperature and so on . therefore , in this thesis the effect of the restore sintering temperature , the oxygenize temperature , the donor and acceptor dopant on the dielectric and varistor properties of devices were studied . with sem , the microstructure of srtio3 - based double function ceramic was analyzed 而晶粒生长、晶粒半导化和晶界绝缘化受到多种因素的影响，诸如杂质的种类和含量、烧成温度等，因此本论文研究了还原烧成温度、中温氧化温度、施主和受主掺杂等对srtio _ 3基陶瓷的压敏和介电性能的影响，并借助于sem分析对srtio _ 3基双功能陶瓷的微观结构进行了分析。
