Deconvolution with supersmooth distributions

Nonparametric deconvolution problems require one to recover an unknown density when the data are contaminated with errors. Optimal global rates of convergence are found under the weighted L_p-loss (1 ≤ p ≤ ∞). It appears that the optimal rates of convergence are extremely low for supersmooth error distributions. To resolve this difficulty, we examine how high the noise level can be for deconvolution to be feasible, and for the deconvolution estimate to be as good as the ordinary density estimate. It is shown that if the noise level is not too high, nonparametric Gaussian deconvolution can still be practical. Several simulation studies are also presented.     

Effects of gall volume on survival and fecundity of gall-making aphidsAdelges japonicus (Homoptera: Adelgidae)

Summary The number of larvae reaching maturity within the gall ofAdelges japonicus was positively related to gall volume, and the relationship between the number of mature larvae and gall volume did not change with different densities of colonized larvae. The population changes in the bud galls ofA. japonicus were surveyed by collecting the galls, which did not suffer predation or parasitism within the galls, from young artificial plantations ofPicea jezoensis over two years. In the year when the density of colonized larvae was high, they suffered a 42% mortality within the galls, whereas mortality was nearly zero in the low density year. The numbers of larvae per gall were positively correlated with gall volume. The regression lines of the number of colonized larvae on gall volume did not differ significantly in the regression coefficients between the two years, whereas the intercept was significantly higher in the year when the density of colonized larvae was higher. However, different within-gall mortality nullified this difference, and the regression lines of the number of mature larvae on gall volume had no significant difference both in the regression coefficients and the intercepts. This suggests that the number of mature larvae per gall was limited by available resources within the gall which were positively related to gall volume. In 25% of the galls in which mature larvae inhabited, the space within the galls were completely filled by the larvae, indicating that space was one of the limiting resources. Gall volume also affected the number of adults that emerged from the gall and the potential number of their progeny.     

TESTING SPHERICITY UNDER A MIXTURE MODEL

The robustness of Mauchly's sphericity test criterion when sampling from a mixture of two multivariate normal distributions is studied. The distribution of the sphericity test criterion when the sample covariance matrix has a non-central Wishart density of rank one is derived in terms of Meijer's G-functions; its distribution under the mixture model is then deduced. The robustness is studied by computing actual significance levels of the test under the mixture model using the critical values under the usual normal model.     

论行为管理手段的“四制”关系

管理行为不同层次的矛盾有其特殊性,可以选择不同的方法加以解决。制度在行为管理手段中有其适用范围,此外,机制、“人制”、自制也是行为管理的另外三种有效手段,这四种行为管理手段有着各自的特点和适用范围,有鉴别地应用好这四种行为管理手段,可以有效地解释行为管理的现象,并可指导行为管理实践。     

高校师德建设的思考

师德建设事关高校办学方向和人才培养质量。在新时期客观分析师德建设状况,加强和改进师德建设是全面贯彻党的教育方针的重要保证,是培养社会主义事业建设者和接班人的必然要求。     

贾府的道教风俗及其“悲凉之雾”

道教的消灾祈祥法术在文学巨著《红楼梦》中得到了充分的展现:在贾府,无论主子或奴婢,有的佩戴护身符欲消灾避祸,“仙寿恒昌”;有的炼丹烧汞欲升为神仙;有的打醮设道场欲解除冤孽;有的作法欲诅咒他人等。然而,那些欲消灾者病缠身,欲成仙者命早亡,欲害人者先害己,落了个烟消云散的悲惨结局,无不笼罩着浓重的“悲凉之雾”。撩起悲凉的雾纱,可以窥探出曹雪芹对道教“助教化”无望又找不到“补天”良策的彷徨苦闷心情。曲曲悲歌实际是曹雪芹对道教信仰及其法术失灵的形象化宣泄和标示。     

新时期高等学校教师培训工作的思考

分析了高等学校教师培训工作的现状,即不完全适应时代发展的需要;不完全适应我国加入WTO后高等教育与国际接轨的需要;不完全适应高等教育自身深化改革和发展的需要;不完全适应教师参训的个性愿望的需要。针对高等学校教师培训实际工作中存在重学历培训,轻师德培养;对教师创新能力、实践能力的培养不够重视;经费短缺,内容陈旧,考核机制不够完善等问题,提出了健全规章,实行依法培训;加强师德建设,采取多种形式,提高教师综合素质;设立专项培训经费及建立健全教师培训的激励机制的对策。     

论政府在社会主义市场经济中的职能定位问题

政府在社会主义市场经济中如何定位一直是理论界争论的焦点之一。通过对市场与政府的关系分析,指出在中国市场和政府结合的最佳途径是以市场为基础,将政府职能转化为以建设公共服务型为重点。     

语用学需要"顺应"潮流--顺应论的几个关键概念述评

作为一种具有创新意义的语用学理论,顺应论并没有像关联论那样引起语用研究者足够的重视,也没有产生应有的学术效应.它同关联论一样具有较强的理论解释力,因而值得人们深入研究.文章介绍了顺应论的理论要点,重点评述了顺应论四个关键概念做出选择、变异性、商讨性、顺应性,同时也呼吁语用学界应给予顺应论足够的关注.     

论魏晋南北朝时期儒学的衰落

魏晋南北朝时期是我国学术思想多元化发展时期。期间玄学兴盛,佛道流行,而在两汉居于统治思想地位的儒学却衰落不堪。本文从魏晋南北朝时期的社会特点、学术思想盛衰消长的客观情势以及儒学自身的状况去探究儒学衰落的原因,以有助于总结思想史发展的一般规律。