Considering the special structure of multi - ribbed slab , founding diphase body mechanical model of compound material , strengthening rib beam and rib pillar by equivalent volume ratio of concrete and slice brick , the paper drew elastic compution constant and shear constant . based on the things , the paper simplified isotropy compution model to wall , gave practical design formula of elastic mold and shear mold , provided necessary parameter for practical design formula of elastic rigidity . finally the calculating results agree well with the text results 结合密肋复合墙板的特殊构造，建立墙板的复合材料二相体力学模型，按照混凝土与砌块体积比不变原则对肋梁肋柱同时加强，得出墙板的弹性计算常数及剪切常数，在此基础上，进一步将墙板简化为各向同性的计算模型，给出墙板弹性模量及剪切模量实用计算公式，为密肋复合墙板的实用弹性刚度计算公式提供必要的参数。
Biology , etc . owing to many merits has not yet been used to measure parameters of gratings . the paper researches on the subject in view of current lack of it . the main tasks of the paper include : analyzing ellipsometric characteristics of gratings in detail with vector diffraction theory and ellipsometrics ; devising a reflective quarter wave plate at normal incidence according to some ellipsometric characteristics ; making use of normal simplex algorithm during ellipsometric inversion of gratings parameters , inversing ellipsometric parameters with gaussian noise of different standard deviations to simulate actually measured values with examples of isotropic metallic and anisotropic step gratings and testing that ellipsometry about gratings parameters is feasible with the range of certain precision ; discussing choice of incidence angle at length 本论文的主要工作包括：结合光栅的矢量衍射理论和薄膜的椭偏理论，详细分析了光栅的椭偏特性；并且根据一些椭偏特性设计出一款正入射反射型单波长1 4波片；在光栅参数的椭偏反演中，引入正单纯形法作为反演算法，分别以各向同性的正弦形金属光栅和各向异性的阶梯型光栅为例，在标准椭偏值的基础上加入不同偏差的高斯噪声来模拟实际的椭偏测量值进行反演，在一定精度范围内得出满意的光栅参数，说明光栅参数的椭偏测量是可行的；还就入射角的选取问题进行了一定的探讨。
But the precondition of this method is that the material must be the elastic isotropy . for the elastic anisotropy , because of the difference in the each direction of mechanical properties , actually , the result of the nanoidentation load - displacement data is the synthesis of the mechanical properties in every direction 但是这种方法的一个前提是各向同性的材料，对于各向异性的材料，因为机械性质在各个方向上不同，所以在一个方向上的压痕试验结果实际上是各个方向不同材料性质的一个综合值。
Theoretically , there is a isotropic pole in the center of the polar orthotropic plate and linear orthotropic part near the periphery of the plate . so a transition area must exist between the pole and the periphery . this can result in the inhomogeneous property of the circular plate in fact 理论上，极正交各向异性圆板的中心点是一个各向同性的极点，而远离中心点的部分为直线正交各向异性，因此，在这个中心点到直线正交各向异性部分之间必然存在一个过渡区域，这就导致了实际的各向异性圆板的不均匀性。
The aim of this study is to investigate theoretically the possibility for activation of small mammalian myelinated nerve fibers without activating larger ones when stimulating a nerve fiber bundle with a monopolar point electrode using biphasic pulses , which can reduce the electrochemical damage resulted from stimulation pulses to nerve fibers . a simulation system for studying the electrical properties of mammalian myelinated nerve fibers was built based on a simple infinite and homogeneous volume conductor model . by use of an asymmetric but charge - balanced stimulation waveform , the sensitivity of excitation and blocking threshold of nerve fibers to fiber diameter , electrode - fiber distance was calculated . the results show that selective activation of small mammalian myelinated fibers may be possible in a region at some distance from the electrode using biphasic pulses 本研究的目的是要从理论上探讨利用单电极双向脉冲刺激实现哺乳动物神经纤维选择性刺激， (即当刺激一束神经时，不兴奋粗神经而兴奋细神经)的可能性.双向脉冲刺激可以降低刺激脉冲对神经纤维产生的电化学损伤.为研究哺乳动物有髓神经纤维的电特性，建立了一个基于简单的无穷大、各向同性的容积导体模型的仿真系统.利用该仿真系统，采用“不对称但电荷平衡”的双向脉冲刺激，计算了神经纤维的兴奋和阻断阈值与纤维直径、纤维-电极间距离的关系.结果表明：在距电极一定距离内采用该双向脉冲刺激模式确实可以实现哺乳动物有髓神经纤维的选择性兴奋
The high similarity in shapes and large overlapping areas of corresponded contours on adjacent cross - sectional are main conditions in reconstructing surface correctly . in accordance with the disadvantage of blurring caused by traditional gray - level interpolation methods , this dissertation introduces a method to interpolate 3d images based on point matching approach to get 3d isotropy volume data . with respect to non - similar shapes or no superposition of corresponded contours on adjacent slices and concave contours , this dissertation presents a method for shape - based interpolation based on nonuniform scale bounding box 相邻断层上对应轮廓区域的形状相似和重叠部分大是保证重建表面正确性的重要条件，针对传统灰度插值容易引起模糊边界的缺点，本文采用基于对应点匹配的方法进行灰度插值，以获得各向同性的三维数据；针对相邻断层间对应轮廓的形状不相似，位置不重合和有凹轮廓线的情况，提出一种基于包围盒非均匀比例放缩的形状插值方法。
