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31.
探讨了具有大边梁的弯梁桥荷载横向分布的计算－ 在刚接梁法的基础上, 根据等刚度原理,并用集中力代替均布力, 导出简化的力法正则方程, 从而求出各主梁的荷载横向分布系数 相似文献
32.
The scallop moderate longhole blasting mining method in Da Hong-shan copper mine applications accounted for more than 61% of the total amount of mining, but the large output rate restricts the mines for ore strength, The average lump ore as high as 22.7%. In order to realize the mine production efficient development, the circular moderate longhole blasting technology and field test. The test results show that circular hole blasting can reduce the block rate is reduced to 10.3%, and the traditional scallop moderate longhole blasting mining compared with the average lump ore decreased by 12.4 percentage points. The panel on duty for the day ore quantity increase 152.31t, increase rate is 51.1%. Reduces the handling of large time delay and secondary crushing of explosives and the consumption of detonators, the efficiency of drawing and at the same time, reduce the mining cost , achieved good blasting effect. 相似文献
33.
在了解喇叭裙结构和工艺的基础上,通过实验研究喇叭裙的最佳丝绺方向和裙片数．选用同一种面料,并按不同斜裁角度,不同裙片数量制作成喇叭裙,然后通过拍照进行数据处理,得出斜裁角度及裙片数对喇叭裙外观形态的影响以及最佳斜裁角度及裙片数,从而优化喇叭裙的外观形态．结果表明,选用涤棉混纺面料制作喇叭裙时,在裙片数相同时,各片中线沿面料经向裁剪制作出的喇叭裙外观形态较好;在喇叭裙各片中线与面料经向夹角相同时,10片裙的外观形态较好． 相似文献