Policy responses to external shocks in sub-Saharan African countries

The author analyzes the experience of sub-Saharan African countries with external shocks in the form of the deterioration of the terms of trade and the world recession between 1973 and 1978, with distinction made between low-income and middle-income countries. Adjustment to external shocks in low-income sub-Saharan African countries took largely the form of reductions in imports through lower rates of economic growth and lower income elasticity of import demand while these countries lost export market shares. Losses in export market shares were smaller in the middle-income countries and in the entire group, export performance was positively correlated with the rate of economic growth.     

On equality of ordinary least squares estimator,best linear unbiased estimator and best linear unbiased predictor in the general linear model

The equality of ordinary least squares estimator (OLSE), best linear unbiased estimator (BLUE) and best linear unbiased predictor (BLUP) in the general linear model with new observations is investigated through matrix rank method, some new necessary and sufficient conditions are given.     

生命力的赞歌——论劳伦斯变异的人文主义在《查泰莱夫人的情人》中的表现

D.H.劳伦斯希望通过恢复男女两性关系的自然性来拯救危机四伏的西方社会,在他的作品里充满了对生命力的赞美。他这一思想与西方传统的“人文主义”思想很相似,却并非完全相同,这一思想可称为变异的“人文主义”思想,他的这种思想集中表现在《查泰莱夫人的情人》中。     

非奇异H矩阵研究

给出了非奇异Ｈ矩阵的一个必要条件和一种简单实用的判定方法     

Childhood family structure and young adult behaviors

This paper examines a wide variety of forms, and full histories, of family structure to test existing theories of family influences and identify needs for new theories. The focus is on links between childhood family structure and both completed schooling and risk of a nonmarital birth. Using a 27-year span of panel (PSID) data for U.S. children, we find that: (a) change is stressful, (b) timing during childhood is relevant, (c) adults other than parents are important, and (d) two more recently studied family structures (mother-with-grandparent(s) and mother-with-stepfather) do not fit the molds of existing theories. The findings suggest that new theories should consider allocation of resources and reasons people group into family structures. Received: 11 September 1998/Accepted: 27 March 2000     

Partitioning k multivariate normal populations according to equivalence with respect to a standard vector

We propose optimal procedures to achieve the goal of partitioning k multivariate normal populations into two disjoint subsets with respect to a given standard vector. Definition of good or bad multivariate normal populations is given according to their Mahalanobis distances to a known standard vector as being small or large. Partitioning k multivariate normal populations is reduced to partitioning k non-central Chi-square or non-central F distributions with respect to the corresponding non-centrality parameters depending on whether the covariance matrices are known or unknown. The minimum required sample size for each population is determined to ensure that the probability of correct decision attains a certain level. An example is given to illustrate our procedures.     

The macroeconomics of fertility in small open economies: A test of the Becker-Barro model for The Netherlands and New Zealand

Becker and Barro (1988) formulated a theoretical model which identified a range of macroeconomic variables which can temporarily or permanently affect fertility in small open economies. This article tests the Becker-Barro model with relevant data which covers most of the 20th century for two small open economies, namely The Netherlands and New Zealand. The results show that government subsidies for having children have a strong positive effect on fertility, while the provision of public pensions has a strong negative effect. The degree of intergenerational altruism appears to have been declining. Moreover, there is only weak support for the hypothesis that real interest rates positively influence fertility. Received: 2 March 1998/Accepted: 1 September 1999     

饱和粘土蠕变特性研究及参数确定

将两种弹 粘弹性模型（Burgers和H 2K模型）的一维蠕变方程，转换成三维状态下的应力 应变 时间关系，分别推导出常应力下两种模型的轴向应变随时间变化的方程。采用分级加载法进行室内长期单轴压缩蠕变试验，结合两种模型三维应力状态的轴向应变表达式，对试验结果进行拟合，得出相应模型的本构参数。试验结果表明：饱和粘土在新增荷载作用下2~3　d变形趋于稳定，Burgers模型和H 2K模型均能较好地模拟饱和粘土的衰减蠕变过程；而H 2K模型能更好地模拟土样在常应力作用下的蠕变特性。     

需要层次理论在弱势群体思想政治工作中的运用

马斯洛的需要层次理论着眼于人的需要的研究,与思想政治工作有相通之处。弱势社会群体是社会发展过程产生的特殊群体,他们需要的满足对于控制重大社会风险、稳定社会有着重要影响。我们应该充分了解弱势群体需要的层次性,运用发展的,变化的观点准确把握弱势群体的需要,要特别重视弱势群体的无意识需要,要注意运用需要次序的变动性激活弱势群体的精神动力。     

无线视频服务器在ADSP-BF5614的研究与实现

通过对视频服务器相关资料的研究,提出了一种基于ADI公司专用DSP芯片ADSP-BF561的无线视频服务器的解决方案。硬件设计采用SAA7113芯片完成输入视频A/D转换,以ADSP-BF561芯片为核心硬件平台实现视频压缩编码,利用相应外围设备实现网络控制和传输。该方案由于使用了H.264视频编码标准、G729音频编码标准和基于CDMA1X无线网络技术的CDMA无线网络作为音视频数据的传输途径,具有良好的稳定性和可实现性。