水力发电企业整体效益评价及实例

针对水力发电企业的整体经济效益难以进行评价的问题,提出了以灰色关联度技术为支撑,选择数量模型评价方法,应用层次分析法的有关技术和思想,建立起具有可操作性的评价模型及评价体系。     

关于非数学专业的微积分教学改革

本文认为,当前非数学专业的微积分教学改革,应特别强调微积分的数学建模方法和计算功能,强调对数学原理和背景的介绍.为此,作者以"启发应用意识,提高应用能力"为宗旨,提出从教材到教学法直至成绩考核方法的一整套教学改革方案.     

加强精神文明建设促进人的全面发展

发展社会主义社会物质文明和精神文明,不断推进人的全面发展,是社会主义发展的重要标志。本文从社会主义精神文明建设就是要提高人的素质、培养“四有”新人着手,分析了精神文明建设和社会全面发展、人的全面发展之间的相互关系。     

语用生态文明意义初探

语用生态文明是语言生态学研究的新课题 ,这一全新的语用理念有两层意义 :一是语用观念生态化 ,实现言语多样性与语言一体规范的统一 ;二是语用行为生态化 ,坚持“时空相谐”与“绿色消费”的语用伦理。倡导语用生态文明使我们辩证地观照语言规范问题有了新的视野。     

鸦片战争前清政府对外政策的嬗变——以海关贸易为例

“闭关”是人们对鸦片战争前清政府对外政策约定俗成的界定。揆之于史实,有诸多不切合之处。此段历史,若依清政府海关贸易的嬗递为主线,可划分为“顺其自然”、政策上的“锁国”、“全面开放”及“限关”四个时期,与所谓的“闭关”论出入甚多。任何主权国家都有权依据国情制定自己的对外贸易政策,英人笼统的“限关”论有洗涮罪恶的鸦片贸易之嫌,国人的“闭关”论则是以感情代替史实。我们应以此为鉴,尊重历史,慎作结论。     

对《毛选》中“言必称希腊“的一点看法

本文认为对<毛选>中关于"言必称希腊"一语应有一个完整、准确的理解.毛泽东这里所说的"希腊",既指苏联,也指英美等资本主义国家;既指共产党内教条主义者所背诵的马列主义的个别词句,也指当时国内一部分资产阶级学者所鼓吹的西方资产阶级的东西.毛泽东在重点批评党内教条主义者的同时,也批评了国内的"全盘西化"论者.他虽反对"言必称希腊",但并不反对向外国学习.     

石油企业提高投资效益的总体设计

企业的投资行为是企业经济增长的前提，“发展是硬道理”，投资是关键，成本是核心，效益决定一切，必须不断地提高投资效益。本从转变思想观念，投资理念市场化；转变经营机制，投资行为企业化；转变监控模式，投资管理科学化等三个方面予以诠释，提出一个比较完整的总体思路。     

Adapting by calibration the sample size of a phase III trial on the basis of phase II data

The problem of estimating the sample size for a phase III trial on the basis of existing phase II data is considered, where data from phase II cannot be combined with those of the new phase III trial. Focus is on the test for comparing the means of two independent samples. A launching criterion is adopted in order to evaluate the relevance of phase II results: phase III is run if the effect size estimate is higher than a threshold of clinical importance. The variability in sample size estimation is taken into consideration. Then, the frequentist conservative strategies with a fixed amount of conservativeness and Bayesian strategies are compared. A new conservative strategy is introduced and is based on the calibration of the optimal amount of conservativeness – calibrated optimal strategy (COS). To evaluate the results we compute the Overall Power (OP) of the different strategies, as well as the mean and the MSE of sample size estimators. Bayesian strategies have poor characteristics since they show a very high mean and/or MSE of sample size estimators. COS clearly performs better than the other conservative strategies. Indeed, the OP of COS is, on average, the closest to the desired level; it is also the highest. COS sample size is also the closest to the ideal phase III sample size M_I, showing averages and MSEs lower than those of the other strategies. Costs and experimental times are therefore considerably reduced and standardized. However, if the ideal sample size M_I is to be estimated the phase II sample size n should be around the ideal phase III sample size, i.e. n?2M_I/3. Copyright © 2010 John Wiley & Sons, Ltd.     

Anderson's classification statistic based on a post-stratified training sample

The performance of Anderson's classification statistic based on a post-stratified random sample is examined. It is assumed that the training sample is a random sample from a stratified population consisting of two strata with unknown stratum weights. The sample is first segregated into the two strata by post-stratification. The unknown parameters for each of the two populations are then estimated and used in the construction of the plug-in discriminant. Under this procedure, it is shown that additional estimation of the stratum weight will not seriously affect the performance of Anderson's classification statistic. Furthermore, our discriminant enjoys a much higher efficiency than the procedure based on an unclassified sample from a mixture of normals investigated by Ganesalingam and McLachlan (1978).     

开展综合素质测评,全面提高学生素质

:文章总结了浙江大学医学院学生综合素质测评工作。即采用自我、班级、系、院四级管理体制 ,勤检查、核对、修正 ,增强测评工作的透明度 ,公平合理、真实地反映学生的综合素质情况。实践证明 ,这项工作是全面提高学生综合素质的有效手段