RLC串并联电路的等效互换问题探讨

通过对RLC串并联电路的分析 ,推导出串并联电路等效互换后计算电路参数的统一表达式 ,并对两个元件的串并联电路等效互换进行了讨论。     

Testing symmetry under a skew Laplace model

We develop tests of hypothesis about symmetry based on samples from possibly asymmetric Laplace distributions and present exact and limiting distribution of the test statistics. We postulate that the test statistic derived under the Laplace model is a rational choice as a measure of skewness and can be used in testing symmetry for other, quite general classes of skew distributions. Our results are applied to foreign exchange rates for 15 currencies.     

Scheduling Updates of Probabilistic Risk Assessments: The Arkansas Nuclear One-Unit 1 Experience

This paper presents the results of a study that identified how often a probabilistic risk assessment (PRA)should be updated to accommodate the changes that take place at nuclear power plants. Based on a 7-year analysis of design and procedural changes at one plant, we consider 5 years to be the maximum interval for updating PRAs. This conclusion is preliminary because it is based on the review of changes that occurred at a single plant, and it addresses only PRAs that involve a Level 1 analysis (i.e., a PRA including calculation of core damage frequency only). Nevertheless, this conclusion indicates that maintaining a useful PRA requires periodic updating efforts. However, the need for this periodic update stems only partly from the number of changes that can be expected to take place at nuclear power plants–changes that individually have only a moderate to minor impact on the PRA, but whose combined impact is substantial and necessitates a PRA update. Additionally, a comparison of two generations of PRAs performed about 5 years apart indicates that PRAs must be periodically updated to reflect the evolution of PRA methods. The most desirable updating interval depends on these two technical considerations as well as the cost of updating the PRA. (Cost considerations, however, were beyond the scope of this study.)     

密度分布非均匀的反馈控制Logistic单种群模型平衡态的稳定性

本文对种群密度在非均匀分布情形下,考虑了具反馈控制的滞后 Logistic 生态模型平衡位置的稳定性;分别给出了在常时滞和弱连续时滞以及强连续时滞情况下的稳定性条件;其结果是对 Gopalsamy 在密度均匀分布情形下相应结果的推广.     

多源模型的新进展

本文总结了高能核—核碰撞的多源模型自1987年提出到1990年以来的主要进展,着重介绍多源模型的基本物理思想及其在两种不同方案下的发展动态.通过与最新实验数据比较,说明多源模型能够成功地解释高能重离子碰撞的整体性质.     

试析我国收入分配中的公平问题

收入分配公平是一个历史性范畴,它的内涵随生产关系的变化而变化.正确理解我国收入分配的公平,必须搞清楚机会公平与结果公平、收入分配公平与社会主义市场经济的关系,确立初次分配注重效率,再分配注重结果公平的分配范式.在分配中,防止平均主义,保持合理差距,反对两极分化,坚持效率优先、兼顾公平的原则,促进我国生产力的发展,不断提高人民群众的生活水平.     

孙皓时期皇权的强化及其与儒学朝臣冲突的加剧——孙吴后期政治史研究之二

252年孙权去世,孙吴皇权一度旁落。孙皓继位后,清除权臣,政由己出,一度整肃朝政,颇得赞誉。不过,作为孙吴末代专制君主,孙皓地位稳固后,努力强化皇权,主要表现为重用佞幸小人,加强对儒学朝臣的监察,迁徙都城,甚至无端地兴师北伐以搏取声望。在生活上,孙皓则荒淫奢靡,并无稳定社会、增强国力、体恤百姓的愿望与举措,引起了儒学士大夫的激烈抗争。对士大夫社会的清议之士,孙皓多有杀戮之举。士大夫社会的疏离,动摇了孙吴统治的基础。     

西南科技大学岗位聘任制和岗位津贴制的改革与探索

为适应事业单位试行人员聘用的需要,更为学校适应新形势发展的需要,西南科技大学以全员聘用和岗位聘任为突破口,实行了人事分配制度改革,建立了“以岗定酬”的岗位津贴制。通过对学校人事分配制度改革的思路和具体做法的介绍,以进一步完善和推行全员聘任制。     

民族地区县级政府竞争：路径选择与制度安排

我国地方政府竞争的趋势将愈演愈烈,地方政府竞争带来了不同的竞争效应。文章对地方政府竞争模型的反思入手,分析了民族地区政府竞争的特征和存在问题的基础上,提出了民族地区提升政府竞争力的路径选择:以提升制度竞争力为先,推进市场、产品等要素建设;并对民族地区政府竞争提出相应的制度和政策安排。