表面绕射射线的焦距与扩展因子

用几何绕射理论(G.T.D.)计算导弹及飞行体上的天线的辐射特性,或解决其他绕射问题时,都必须用到表面绕射射线的焦距和扩展因子。现有文献对扩展因子有不同的定义。并且只有部份结果,缺乏系统的数学处理,有的结果还有错误,给应用带来了困难。本文首先求得了任意曲面上绕射射线的焦距和扩展因子的一般公式,然后给出应用上重要的圆柱面、球、圆锥面上二者的结果。这样,本文为曲面绕射的工程应用提供了必要的基础。     

内嵌型介孔分子筛的合成

用表面活性剂十六烷基三甲基氢氧化铵在溶液中形成的液晶相胶态分子团作为模板剂，同时在分子团憎水基团内部导入对乏燃料中钯离子有特效选择萃取效应的协萃剂ＴＯＰＯ－Ｐ２０４，通过表面活性剂亲水基团与易水解的有机硅酸盐阴离子之间的自组织过程，合成了内嵌型介孔分子筛固体吸附剂ＭＣＭ－ＴＰ，经ＴＥＭ，ＸＲＤ，２９Ｓｉ－ＭＡＳＮＭＲ测试，与ＭＣＭ－４１介孔分子筛有相似的孔道结构，但其晶胞参数有所增加，水热稳定性有明显的改善．用于提取乏燃料中的钯，饱和吸附Ｐｄ容量可达０．０１５ｍｍｏｌ／ｇ．     

无线电短波在电离层D区中的吸收

本文将碰撞频率 v 随高度 h 的关系取公认的 v=v_0~(-b/σ),依据某些结果,对电子密度N,在75公里以上取为 N=N_1~(-b/α_1);在75公里以下取为 N=N_2~(h/α_2).计算得出,对于频率 f≥6兆赫的电波,只要σ≥2α_s,电波的吸收 A1/f~2.并讨论了此结果的应用。     

肌苷的离子交换法提取工艺研究

研究了肌苷发酵液不同pH值、树脂预平衡条件、饱和树脂的洗菌、淋洗条件对肌苷离子交换提取和解吸工艺影响情况，并对其离子交换吸附机理进行了详细探讨，旨在确定最佳提取工艺条件。     

A STUDY OF ELECTROMAGNETIC SCATTERING FROM A DIELECTRIC-COATED CONDUCTING CYLINDER

In order to solve the problem of electromagnetic, scattering by a dielectric-coated conducting circular cylinder, the total field excited by an electric and amagnetic dipoles exterior to the cylinder is derived in terms of dyadic Green's function (DGF) technique. Then, the scattering problem can ko solved on basis of the relation between the total and the scattered, field. The solution of the scattorod field can be obtained directly from the general formula of the scattered field as the cylinder is illuminated by a spherical wave. For a plane wave of arbitrary polarization incident to the cylinder from the direction (θ_0, φ_0), the scattered field can be given by the solution of the scattered field with a spherical wave incident as the center of the spherical wave moves to infinity, For an astigmatic wave incident to the cylinder, the scattered field can be derived by suporposing or integrating of the scattered field with the special spherical wave incident.