大小班结合的多媒体教学模式之实证研究

在从理论上探讨大小班结合的多媒体教学模式可行性的基础上,以三峡大学200名学生为研究对象,对该校一年半来采用该模式的授课效果进行了实证性研究。实验结果表明,大学英语采用大小班结合的多媒体教学模式比传统教学模式更有利于培养学生的综合运用能力,尤其是学生的听说能力。     

On Optimality of Bayesian Wavelet Estimators

Abstract.  We investigate the asymptotic optimality of several Bayesian wavelet estimators, namely, posterior mean, posterior median and Bayes Factor, where the prior imposed on wavelet coefficients is a mixture of a mass function at zero and a Gaussian density. We show that in terms of the mean squared error, for the properly chosen hyperparameters of the prior, all the three resulting Bayesian wavelet estimators achieve optimal minimax rates within any prescribed Besov space     for p  ≥ 2. For 1 ≤  p  < 2, the Bayes Factor is still optimal for (2 s +2)/(2 s +1) ≤  p  < 2 and always outperforms the posterior mean and the posterior median that can achieve only the best possible rates for linear estimators in this case.     

文化科学的意蕴：意义理解和价值判断——马克斯&#183;韦伯《社会科学方法论》对人文社会科学研究的启示

《社会科学方法论》是马克斯·韦伯方法论著述的代表作，书中突出了韦伯方法论学说的主要概念。文章着力探究了韦伯方法论学说的思维元点和维度方法，并通过理解这些概念和思想所处的理论境域，分析和讨论了在此基础上其所涉及的一般性问题，揭示马克斯·韦伯《社会科学方法论》对我们进行人文社会科学研究的意义和价值。     

论党的十七大的重大理论贡献

党的十七大的理论贡献在于，首次提出“中国特色社会主义理论体系”这一新概念，有力地回答了在改革开放关键时期“举什么旗，走什么路”的根本问题；明确界定了科学发展观的内涵和全面建设小康社会的新要求，提出了生态文明理念，有力地回答了在21世纪头20年“怎么举好旗，怎么走好路”的基本问题；突出强调推动中国特色社会主义民主政治制度和以民生为重点的社会建设，有力地回答了“如何发展社会主义政治制度，如何保障和改善民生”两大难题。     

在中国特色社会主义新起点上推进新的思想解放

解放思想，是党的思想路线的本质要求，是我们应对前进道路上各种新情况新问题、不断开创事业新局面的一大法宝，是中国特色社会主义的思想精髓。要把中国特色社会主义事业不断推向前进，必须在新起点上推进新的思想解放。     

A modified random-effect procedure for combining risk difference in sets of 2×2 tables from clinical trials

Summary Meta-analyses of sets of clinical trials often combine risk differences from several 2×2 tables according to a random-effects model. The DerSimonian-Laird random-effects procedure, widely used for estimating the populaton mean risk difference, weights the risk difference from each primary study inversely proportional to an estimate of its variance (the sum of the between-study variance and the conditional within-study variance). Because those weights are not independent of the risk differences, however, the procedure sometimes exhibits bias and unnatural behavior. The present paper proposes a modified weighting scheme that uses the unconditional within-study variance to avoid this source of bias. The modified procedure has variance closer to that available from weighting by ideal weights when such weights are known. We studied the modified procedure in extensive simulation experiments using situations whose parameters resemble those of actual studies in medical research. For comparison we also included two unbiased procedures, the unweighted mean and a sample-size-weighted mean; their relative variability depends on the extent of heterogeneity among the primary studies. An example illustrates the application of the procedures to actual data and the differences among the results. This research was supported by Grant HS 05936 from the Agency for Health Care Policy and Research to Harvard University.     

稀土硝酸盐与甘氨酸配合物的合成和表征

在水溶液体系中合成了镧、镨、钐和钆四种稀土硝酸盐与甘氨酸的固态配合物,化学分析表明,它们的化学组成分别是L_0(NO_3)_3·(Gly)_3·H_2O,Pr(NO_3)_3·(Gly)_3·H_2O,Sm(NO_3)_3·(Gly)_3·3H_2O和Gd(NO_3)_3·(Gly)_3·3H_2O,用红外光谱法和x射线衍射法测定了配合物的结构特征,表明它们是一类完全不同于稀土硝酸盐和甘氨酸的新化合物,同时考察了配合物在几种常见溶剂中的溶解性。     

刘壎诗学思想初探

元代诗学主潮为“举世宗唐”,江西诗论家却是其中颇为特殊的一支,他们上承江西统系,探索唐、宋诗之渊承,成为“宗唐得古”思潮下较温和的“折衷唐宋”派,刘壎是其中重要的代表人物。刘壎的诗学思想有两大关键:一是“折衷唐宋”,二是以“四层次”论诗,其诗学思想受陆九渊心学影响颇深。     

强化宪法监督 促进以法治国

加强宪法监督是为了保障宪法的有效实施,这是我国建设社会主义法治的重要途径.就建设法治国家道路上宪法所处的地位以及以法治国与宪法监督制度的相互关系等问题进行了探讨.     

Marginal and association regression models for longitudinal binary data with drop‐outs: A likelihood‐based approach

Longitudinal data often contain missing observations, and it is in general difficult to justify particular missing data mechanisms, whether random or not, that may be hard to distinguish. The authors describe a likelihood‐based approach to estimating both the mean response and association parameters for longitudinal binary data with drop‐outs. They specify marginal and dependence structures as regression models which link the responses to the covariates. They illustrate their approach using a data set from the Waterloo Smoking Prevention Project They also report the results of simulation studies carried out to assess the performance of their technique under various circumstances.