EME occurred when inhomogeneous coal or rock is loaded at uneven speed with the moving of internal electrical charges during the development of cracks.
煤岩体的电磁辐射是由于非均质煤岩体在应力作用下非均匀变速变形及裂纹形成与扩展过程中，内部电荷的迁移而产生。
On the basis of these data, the main factors affecting the crack openings are found according to the basic principles on the emergence and development of cracks.
在试验资料的基础上，根据裂缝出现和开展的基本原理，找出影响裂缝宽度的主要因素。
Some technological problems in the preparation of ferroelectric materials are discussed in detail, such as the prevention of the powder agglomeration and the development of cracks of the film.
重点讨论铁电材料制备过程中的粉体团聚和膜裂纹扩展等有关问题。
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