These tests were not uniformly successful against all anti - personnel landmine types tested , but they did show that our boots can provide substantial protection against high velocity fragments , debris and hot gas streams created during blasts from particular common types of anti - personnel landmines at certain explosive charges 虽然并没有对测试的所有类型的步兵雷取得成功，但测试结果表明，对于某些具有一定爆炸威力的常见类型步兵雷，我们的靴子确实能有效防护其爆炸产生的高速碎片残片和灼热气浪。
( 4 ) the influence of pulsation frequency on the drying process two special cases , in which the selected pulsation frequencies were 0 h / , and 83 h / respectively , were simulated and their simulation results indicated that the pulsating frequency of gas stream could improve the intensities of the heat and mass transfer during a pulse combustion spray drying process ( 4 )揭示了气流脉动对干燥过程的影响本文模拟脉动频率为83hz的脉动气流和非脉动气流的两种干燥过程，比较两种干燥过程的颗粒蒸发速率和湿含量变化。模拟结果表明气流脉动对喷雾干燥过程有一定增强作用。
The exhaust noise contains complex noise elements , including the exhaust noise with a base frequency measured in the number of exhausts in unit time , the resonance noise of the gas column in the pipe , the gas stream blowing noise at the exhaust manifold , the exhaust gas jetting and impact noise , the helmholtz resonance noise of the cylinder , the karman eddy noise and the turbulent noise inside the exhaust system 排气噪声包含了复杂的噪声成分：以单位时间内排气次数为基频的排气噪声、管道内气柱共振噪声、排气歧管处的气流吹气噪声、废气喷注和冲击噪声、汽缸的亥姆霍兹共振噪声、卡门涡流噪声及排气系统内部的湍流噪声等。
