However , it is not easy to incorporate large n concentration in gap due to the large differences in lattice structure ( gan belongs to wurtzite structure while gap zinc blende structure ) and in lattice constant ( ~ 20 % ) between gan and gap , which will lead to an extremely large miscibility gap 然而要在gap中实现高浓度的掺氮并不容易。这主要是由于gap和gan之间较大的物理特性的差异，特别是晶格结构和晶格常数的差异，使得gap和gan存在较大的可混溶性间隙，从而难以生长高质量的高掺氮的gap材料。
Based on the research to the stability variable cross - section beam , the bending defection differential equation of the variable cross - section beam in critical state of bucking is established . according to the edge condition of the structure , the differential equation is solved and bucking equation of variable cross - section beam is created . we can get the algorithm which can be used to calculate the equivalent inertia moment of the variable cross - section lattice structure when it is regarded as constant cross - section of solid web beam 对变截面格构式构件的稳定性计算进行了初步的研究,通过建立变截面构件临界状态下弯曲变形的微分方程,根据变形边界条件,得到了两端铰支的变截面梁失稳特征方程,提出了几种特殊形式的变截面格构式构件等效为等截面实腹式构件时等效惯性矩的计算方法。
At first , we investigated the photoluminescence characterization of theion - implanted samples by spectroanalysis , found that the ion implantation would damage the crystal lattice structure and affect the optical radiation of characteristic . moreover , the crystal lattice structure will be restored after annealing , which can be determined by the change of fluorescence peak intensity and blue migration of wavelength 发现mn ~ +离子、 c离子的注入都会损伤样品的晶格结构，从而影响样品的发光特性，而退火处理对这些损伤有一定的修复作用，这可以从发光峰强度的变化及波长的蓝移来判定。
At first , the author establish the linear and geometric nonlinear static equation on the base of rigid equation of element by qr method and analysis the inner force of spatial lattice structures , and establish the linear and material nonlinear dynamic equation and solve these equations by the method of no limit stabilization 建立网壳结构的线性静力方程和几何非线性静力方程，进行了静力性能分析；建立线性动力方程和材料非线性动力方程，用样条无条件稳定算法分别对其进行求解。
