钨酸铅晶体中F型色心电子结构的研究

运用相对论性的密度泛函离散变分（DV-Xα）方法模拟计算了PbWO4（PWO）晶体中F型色心的电子结构，得到了PWO晶体的态密度分布，讨论了色心的可能光学跃迁模式，并用过渡态方法计算了跃迁能量。计算结果表明，F、F^＋心在PWO晶体的禁带中引入了施主能级，F、F^＋心可向W 5d轨道发生跃迁，其跃迁能分别是1.83eV、2.28eV，因此，可推断F、F^＋心能引起PWO晶体中680nm、550nm的吸收。     

农林院校产学研结合问题探讨

产学研结合是高等教育体制改革的重要举措。农林院校实施产学研结合,是农业教育面向社会、面向“三农”、面向经济建设主战场的必然选择。由于我国社会、经济、教育以及农业发展的复杂性、多样性和地区差异,使得农林院校在产学研结合的方式方法上,始终存在着如何适应社会和进一步改革创新的问题。正确认识产学研结合在新时期的涵义和意义,探索其基本类型、规律、运行机制和模式等,对合并型高校及农林院校进行产学研结合的实践具有一定现实意义。     

Effect of dependence on statistics for determination of change

Quite a number of test statistics and estimators for detection of a change in the mean of a series of independent observations were proposed and studied. The purpose of this paper is to examine the behaviour of these statistics if the observations are dependent, particularly, if they form a linear process.     

Contributions in heterogeneous communities: Evidence from Indonesia

Using household-level data from Indonesia, we investigate the importance of community characteristics: ethnic diversity and central government transfers, inter alia, in determining monetary and time contributions to community organizations. We present a framework in which ethnic diversity affects contributions through three channels: (1) diversity of preferences (2) transaction costs, and (3) inter-household considerations in the form of altruism towards ones ethnic group. Our empirical findings provide evidence that ethnic diversity has a negative and significant effect on contributions, and the prevalence of community organizations. We find evidence that government spending crowds out private monetary contributions, with a less robust effect on time contributions.All correspondence to Una Okonkwo Osili. The authors would like to thank RAND and Lembaga Demografi of the University of Indonesia for making the data available. We would also like to thank Victoria Beard and Chris Peterson at RAND for their assistance. We have also benefited greatly from discussions with Kathleen Beegle, Partha Deb, Kevin Hasker, Kay Ikranagara, Ifeanyi Osili, Richard Steinberg, Mark Wilhelm, and seminar participants at IUPUI, RAND, and LSU. Dan Du and Yang Wang provided valuable research assistance. Financial support from the Indiana University Center on Philanthropy is grateful acknowledged. Responsible editor: Daniel S. Hamermesh.     

Bayesian selection of log-linear models

A general methodology is presented for finding suitable Poisson log-linear models with applications to multiway contingency tables. Mixtures of multivariate normal distributions are used to model prior opinion when a subset of the regression vector is believed to be nonzero. This prior distribution is studied for two- and three-way contingency tables, in which the regression coefficients are interpretable in terms of odds ratios in the table. Efficient and accurate schemes are proposed for calculating the posterior model probabilities. The methods are illustrated for a large number of two-way simulated tables and for two three-way tables. These methods appear to be useful in selecting the best log-linear model and in estimating parameters of interest that reflect uncertainty in the true model.     

从党的十六大报告解读江泽民的忧患意识

作为中国共产党在新世纪的政治宣言和行动纲领,十六大报告的一个鲜明亮点就是处处体现了江泽民的强烈忧患意识和高度的爱国主义情怀。作为贯穿十六大报告的核心和主线,"三个代表"重要思想是解决现实忧患的最根本措施。     

学习党的"十六大"精神 加快高校改革与发展

学习贯彻党的"十六大"精神是一项带有根本性的长期任务,也是高校今后一个时期的首要政治任务,我们要从4个方面认真把握其精神实质,狠抓落实,从3个方面实现高校的跨越式发展.     

社会主义建设新时期中国共产党基本执政规律--党的十六大报告的理论贡献

党的十六大报告全面贯彻"三个代表"重要思想,对我党的思想路线、政治路线和群众路线作出全面发展与创新论述,系统揭示了社会主义建设新时期中国共产党的基本执政规律.     

马克思恩格斯文艺理论“体系”论

20世纪80年代初关于马克思恩格斯文艺思想"体系"问题之争,与"体系"作为概念的混乱有关。"马克思恩格斯文艺思想"、"马克思主义经典作家的文艺思想"、"马克思主义文艺思想",这是三个不同的概念。马克思主义文艺思想具有体系,但马克思恩格斯文艺思想则没有体系。     

由VFC构成ADC的高精度电量测试系统

介绍了一种由V／F变换实现模数转换（A／D）的测试系统，其中利用了多功能同步V／F转换器AD652，测试直流电压的精度高达十万分之三左右。