The microcracks have certain effects on reducing the average thermal expansion coefficient, nevertheless they decrease the mechanical strength of the ceramics.
微裂纹对降低陶瓷材料的平均膨胀系数有一定作用，但同时又降低了材料的机械强度。
Considering adverse effect of rainfall on slope's stability, it analyses the change of safe coefficient after cohesive strength of talus slides reducing under the effect of pore water pressure.
考虑降雨对边坡稳定的不利影响，分析了孔隙水压力作用下堆积体粘聚力折减后堆积体的安全系数的变化。
The double spiral wire solders are adopted to improve the connecting strength and reduce the overlapping coefficient to less than 50 percent, thereby reducing the cost.
采用双螺旋焊线提高了连接强度，减少了重叠率使之小于50％， 从而达到成本低。
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