建立了单一粉煤灰影响因子模型，分析了粉煤灰掺量对混凝土空气渗透系数的影响。
The model of a factor that fly ash effects on carbonation resistance was found, effect of fly ash on the air infiltration coefficient is analyzed.
试验结果表明，该系统在不影响进气充量系数的情况下，对柴油机有害气体排放量影响显著。
The test results show that, without obvious increase of volumetric efficiency, this system is able to make obvious change to the exhaust gas emission of diesel engine.
分析齿轮摆辗凹模的失效形式，并且通过改变直齿圆锥齿轮摆辗的工艺参数的有限元模拟，探讨了凹模进给量、摩擦系数和摆头倾角的改变量对凹模应力影响以及对凹模失效形式的影响。
The failure form of rotary roll cavity die for straight tooth bevel gear was analyzed, and the finite element simulation method was employed to change the processing parameter of rotary roll.
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