高职课堂健康状况诊断及建议

高职课堂教学中存在一些病态现象:课堂缺乏吸引力,教师与学生的关注点及情感脱节;教学设计意识不强,效率低下;在课堂教学中缺乏对艺术性的认识和追求,粗糙平庸。要保障教学质量,必须对这些病态的现象进行认识和治疗。     

黄河上中游降水正态性与稳定性分析

基于1961-2011年黄河上中游45站年、月降水量资料,利用偏态(峰度)系数、变差系数、皮尔逊Ⅲ型分布等统计方法,对该区降水量进行正态性和稳定性分析,并拟合不同保证率下的年降水量及百年重现期.结果表明:年降水量有33.3％的台站未通过正态性检验.月降水量冬季各月几乎所有台站均不服从正态分布,夏季各月降水量正态性略好,但未通过正态性检验站数也在60％以上.对降水量进行非线性变换后的正态化效率达95.4％,其中1月、2月、3月平方根法优于立方根法,11月、12月反之,其余月份基本相同.降水稳定性冬季最差,春季次之,夏、秋季最好,从区域看,青海高原东部降水稳定性最好,河套北部最差.P=50％和P=80％保证率下的降水量自东南向西北递减,前者接近平均值,后者远低于平均值.有21个台站年降水量历史极大值突破了百年一遇,与年降水量未通过正态性检验的台站基本对应,主要集中在陇中-陇东-宁夏南部地区,该区域属于气候变化的敏感区和极端降水事件的多发区.     

酉群的基本子群的正规性

本文证明了当R是几乎可换环,R-模M=⊥M',且它的Witt指数≥3时,EH(M,h)是GH(M,h)的正规子群.     

How Large is a Large Sample?

When teaching students about the Central Limit Theorem, it is difficult to give simple guidelines about when its use is justified. We demonstrate that the sample size needed depends to a great extent on the parent distribution and propose a method, based on the use of microcomputers, for helping students to appreciate the theorem and when it can safely be used.     

USB规范、特性及通信模式

电脑主机与外部设备的连接基于接口实现.USB的出现,解决了早期接口设计的许多麻烦和不便,其不直接消耗系统资源,真正的"即插即用",可谓"万能接口".     

极大似然估计的性质探讨

文章首先介绍了极大似然估计,然后综述了极大似然估计的优良性质,同时探讨了在应用极大似然估计时所应注意的问题。     

Normality,Deviance, Identity,Cultural Tracking and School Achievement: The case of Ethiopian Jews in Israel

This article reveals the intrinsic connection between the constructs normality, identity, meaning, cultural tracking, and school achievement. In particular, it illuminates the indirect connection between cultural tracking and a reduction in the meaningful engagement of school tasks. As documented elsewhere, learning proceeds in a meaningful environment with meaningful goals embedded within the broader framework and context of human life, with identity anchored in a stable cultural and communicative framework. What my study shows is how Ethiopian students are in a state of identity crisis as they grapple with two cultural systems and structures of meaning which confuse their sense of direction. In the process, meaningfully propelled learning dispositions and an affectively driven urge to achieve scholastic excellence deteriorate. Thus, the lagging academic performance of these children is partly caused by the school system which has little knowledge of the way these children and their parents feel and think in terms of identity, belongingness and negotiation of meaning. It is not that Ethiopian students are unmotivated, they work hard to achieve excellence. It is more that the process of learning a new code of behaviour, values and school culture is taking place rapidly without the original culture's active participation as a basic link and a vehicle for further learning. The article also points out the extent of the economic and otherwise power‐related differences between black and white Jews in Israel.     

全纯函数与其微分多项式分担函数的正规性

研究全纯函数与其微分多项式分担函数,得到了如下的正规定则：设F是区域D内的全纯函数族,k是一正整数,h1（z）,h2（z）在区域D内的解析,满足｜h1（z）｜2＋｜h2（z）｜2≠0。若f∈F,f的零点重级至少为k,且f（z）=0｜f（k）（z）｜≤M（常数M〉0）,（z）=αi（z）L（Z）=αi（z）,i=1,2,其中L（z）=f∞（z）＋α1（z）f（k-1）（z）＋…＋αk（z）f（z）为f的微分多项式,αi（z）（i=1,2,…,k,k≥1）在D内解析,那么F在D内正规。     

一族全纯函数的正规性

对具有一定性质的全纯函数进行研究,得到了一族全纯函数的正规性质．