After defining group action triple and discussing some of its fundamental properties,the author has constructed the double half-value product of group action triple,and proved that the half-value product satisfies associative law.
定义了群作用三元组的概念,这是有限群研究中经常出现的一种情形。
Defect states in three-component phononic crystal;
三组元声子晶体中的缺陷态
Using the finite difference time domain(FDTD) method,the transmission spectrum and the propagating characteristics of defect modes in two-dimensional three-component GaAs/glass/air photonic crystal are investigated.
运用时域有限差分(FDTD)方法计算了GaAs/玻璃/空气三组元光子晶体的透射频谱及缺陷模的传输特征,发现GaAs/玻璃/空气三组元体系的最低完全带隙宽度明显宽于玻璃/空气或GaAs/空气二组元体系,适当调整GaAs/玻璃比例可以得到宽带隙;光子晶体中的缺陷会形成局域模式,线型缺陷形成光波波导;设计适当的组合缺陷,并通过缺陷之间的耦合作用可以实现对光波传播的选择性输出。
The effect of the third element on the properties of CuCr alloys was studied emphatically .
采用机械合金化工艺由Cu、Cr及添加第三组元素粉按一定质量比合成CuCr及CuCrM (M =W ,Fe)预合金粉 ,尔后用爆炸压实工艺制备电触点材料CuCr合金。