In this thesis , based on analyzing the data , home and abroad , and manufacturing thick - web single - based oblate spherical propellant powder at nust , the technique of manufacturing thick - web double - based oblate spherical propellant powder was presented , and various affecting factors on its shape and density were discussed , and the technique of improving shape and density was brought forward 本文在总结国内外大量资料和南京理工大学对单基大弧厚球扁药制造的基础上，研究了大弧厚双基球扁药的制造工艺，详尽探讨了影响其药型和密度的各种因素，并在此基础上提出了能较好地改善其药型、提高其密度的工艺条件。
Based on rain drop size distribution ( dsd ) data measured in qingdao , guangzhou and xinxiang , the radar reflectivity factor z for spherical rain drops , the radar reflectivity factor zh and differential reflectivity zdr for oblate ellipsoid rain drops have been calculated . the relation of reflectivity and rainfall rate for conventional meteorological radar and the relation of reflectivity , differential reflectivity and rainfall rate for multiparameter radar are regressed , the performance difference of two kinds of radar for measuring rainfall and difference for measuring rainfall in different regions are also discussed 基于我国青岛、广州和新乡地区雨滴尺寸分布数据，计算了球形雨滴雷达反射因子，椭球形雨滴雷达水平极化反射因子和差分反射率，回归给出了这些地区的常规气象雷达反射因子与降雨率的经验关系和多参数雷达水下极化雷达反射因子、差分反射率和降雨率关系，并对其测雨精度和地区差异进行了比较。
In this thesis , the internal force and transfiguration of the double reticulated dome under different load combination are studied ; the linear and nonlinear analysis are separately performed ; compare the difference between space girder element and space truss element ; at last analyze the dynamical response under seismic action . the horizontal seismic response of double layer oblate lattice shell is analyzed by using step - by - step integration procedure . the effect of some parameters such as exterior load , different support conditions and damping ratio on the dynamic internal forces and dynamic properties is studied 本文旨在研究双层球状网壳结构在各种载荷组合下的内力和变形，分别进行了线性和非线性静力分析；进行了空间梁单元和空间杆单元两种计算模型的比较；最后进行了在地震荷载作用下的动力反应分析，动力分析中用子空间迭代法得出了这类空间结构的动力特性，用时程法中的振型叠加法分析了结构在水平地震作用下的动态响应规律。
By driving expressions and using the method in numerical integration , the results of numerical calculations are analyzed , discussed and contrasted with different conditions , and they showed that there are evident differences in the mean attenuation , scattering , and back scattering cross sections of oblate spheroid particles when the variance is so small that it is near to zero namely it is the same as the rotatory axes are parallel with one direction and when h - polarized and v - polarized incident waves happened . these differences are depended on the relative differences in the average orientation of rotatory axes and the polarized directions of incident wave 通过公式推导和数值积分计算并对结果做了讨论和分析，对比各种情况表明：扁椭球粒子群在方差很小接近为0时，与粒子群旋转轴一致取向的情况相同，入射波水平极化和垂直极化时的平均衰减截面、平均散射截面、平均后向散射截面有明显的不同，这决定于旋转轴平均取向和入射波极化方向的相对差异。
