一类可化为一阶线性微分方程的微分方程求解

通过变量变换,将一类非线性微分方程化为一阶线性微分方程,从而求出其通解.     

关于Semigroups of Linear Operators and Applications to Partial Differential Equations的两个注解

指出文献[1]关于Co半群可微性的定理2.4.11的证明过程中一处错误，及关于柯西问题解的指数衰变的定理4.4.1的证明过程中的不妥之处，并给出新的证明。     

Characterization of ZnO:AI films deposited by r.f.magnetron-sputtering at low temperature

Transparent conducting ZnO:AI thin films with good adhesion and Iow resistivity have been prepared on organic substrates and Coming 7059 glass substrates by r.f. magnetron-sputtering technique at Iow substrate temperature (25-210℃). Structural and photoelectric properties of the deposited films are investigated. The deposited films are polycrystalline with hexagonal structure and a preferred orientation with the c-axis perpendicular to the substrate. Only the (002) peak is observed.High quality films with resistivity as Iow as 1.0 x 10- 3Ω@ cm and 8.4 x 10- 4Ω@ cm, the average transmittance over 74% and 85% in the wavelength range of the visible spectrum have been obtained on different substrates.     

关于中心指数是2的环

本文首先定义了环的中心指数的概念,然后特别讨论了中心指数是2的一些环。     

MATLAB软件在信号与系统教学中的应用

本文论述了在信号与系统分析中如何利用MATLAB软件编程使一些运算量较大、抽象的问题变得简单而直观。     

Conservation Laws in sine—Gordon Equation

There are two conservation quantities needed to derive conservation laws of sine-Gordon equation in a frame of laboratory reference.one of them could be derived easily with a standard process,but the other could not .After the gauge transformation e^-iθσ2/2is introduced,we simply obtain the other one without any questionable assumption.     

38CrMnMo钢异常断口的分析

用扫描电镜KYKY－1000、能谱仪观察分析了38CrMnMo钢（调质热处理）拉伸实验后的异常断口，结果表明：钢中冶金夹杂物是导致38CrMnMo钢异常脆性断裂的主要原因。     

关于NF-环的构造

研究了无限的ＮＦ－环及有限的ＮＦ－环，并且给出了有限ＮＦ－环的构造．     

循环冷却水杀菌剂的发展

综述了国内外冷却水用杀菌剂的现状以及酶处理技术、复配式杀菌剂的发展。提出了应加强杀菌剂种类、针对性杀菌剂及复配式杀菌剂的研究。     

民族地区经济发展与高素质人才开发

物质资本对经济发展的作用十分突出，人力资源(人力资本)对推动经济发展的作用越来越明显。只有大力发展民族地区教育，扩大智力投资，为少数民族地区源源不断的输送高素质人才，才能加快少数民族地区的经济发展。