The calculation and converting of the formula for punching density of needle punching nonwovens and the usage of the slide rule are introduced, to be favourable for producers to use.
介绍了针刺法非织造有针刺密度的计算公式及其变换,以及计算尺的使用,以利于生产者方便应用。
The results show that Widmansttten structure needle consists of many blocky subgrains that have higher dislocation density and subgrain boundary is made up of dislocation tangle.
结果表明,魏氏组织针由多个块状的亚晶粒组成,亚晶粒边界由位错缠结而成,在亚晶粒内有较高的位错密度;
Early and late frost, Dedrolimus superans, sawfly and needle cast of larch could reduce the quality and quantity of foods of larch casebearer and had indirect effects on its population density.
早霜、晚霜、松毛虫、叶蜂及落叶松早期落叶病等都能直接影响鞘蛾食物的质量和数量,进而间接地使鞘蛾种群密度降低。
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