中国与多边出口控制机制关系之演变及原因探析

冷战结束后,中国全面加入了主要国际军控条约,由此也承担起相应的防扩散义务。对核、生、化以及导弹领域的敏感技术和设备进行严格的出口控制是防扩散政策的重要组成部分。近年来,中国政府在加强本国防扩散政策的同时,开始逐步与国际上主要多边出口控制机制进行接触,寻求积极对话并申请加入其中部分组织。中国与国际多边出口控制机制关系的走向受到多种因素的影响,还有待进一步观察。     

用Excel软件求解线性规划和某些数学问题的方法

介绍了用Excel软件求解线性规划的方法,在此基础上给出了用该软件求解不等式问题和线性方程组的方法.     

logx／（x－1）的界和平均值

通过研究函数ｌｏｇｘ／（ｘ－１）（ｘ＞０，ｘ≠１）的界，本文改进了Ｋａｒａｍａｔａ不等式，Ｓｔｏｌａｒｓｋｙ不等式以及王中烈——王兴华不等式     

关于几个积分不等式

利用Tchebycheff积分不等式构造了几个三角函数不等式.估计了与sinx／x，x∈［0，π］有关的定积分的值.得到一些积分不等式.改进或推广了有关结果。     

Two‐stage model selection procedures in partially linear regression

The authors propose a two‐stage estimation procedure for the partially linear model Y = f_o(T) + X'β_o + ψ. They show how to estimate consistently the location of the nonzero components of β_o. Their approach turns out to be compatible with minimax adaptive estimation of f_o over Besov balls in the case of penalized least squares. Their proofs are based on a new type of oracle inequality.     

Strategies for survival: users' experience of child welfare in three welfare regimes

This paper draws on research into child welfare services in France, Germany and England which compares the subjective experience of mothers who have been in contact with family support and child protection agencies in the three countries. The mothers' stories suggest that successful help‐achieving strategies differ according to the nature of the child welfare regime, and that behaviour which is effective in getting a good response in one country may work less well elsewhere. The stories of two mothers in each of the countries have been chosen to demonstrate how the structures of different social welfare regimes affect the efforts of welfare users to get the help they need.     

关于两个常见不等式的讨论

本文主要介绍了柯西不等式、平均值不等式的证明方法,以及它们在其它不等式方面的一些应用。简单阐述了两 个不等式的极限形式。     

柯西(Cauchy)不等式及其应用

通过对柯西(Cauchy)不等式证明的阐述，在此基础上着重介绍了初等数学中有关柯西不等式的使用方法，及其在证明不等式等有关问题时的重要作用和应用技巧。