对恢复高考英语听力测试的思考

自2000年以来,我国开始在高考英语试题中逐渐推广听力测试,2003年高考英语听力测试在全国普及,促进了基础教育阶段学生英语听力水平的提高。但2005年起出现了部分省区取消或淡化高考英语听力的现象。本文探讨了此举的原因、危害,建议尽早恢复高考英语听力测试,发挥高考对基础英语教育的正面反拨作用,为培养学生的英语交际能力打下基础。     

电力变压器离线局部放电测量试验中的容升现象分析

Partial discharge test on a transformer is carried out according to the items in IEC 60.During the test,unproved measuring system is calibrated by proved system at a voltage no less than 50% the rated testing voltage.The result is then extrapolated linearly,leading to an error related to the distribution of stray capacitance,which varies with the testing frequency,especially to large transformers.In this paper a factor,named the capacitive rise fact,is introduced to assess the rise.The factor can be adjusted to some extent by changing the reactance that is connected to the LV side of the testing circuit to lower the capacity of the power source.However,the factor changes when the voltage divider on the high voltage side is removed after the voltage ratio has been calculated,and a great error is resulted under unfavorable conditions.     

Physical activity profiles and selected muscular fitness variables in English schoolchildren: A north–south divide?

The aim of the study was to compare and contrast habitual physical activity (PA) profiles and muscular fitness in schoolchildren from northern and southern regions of England. Data were collected from two secondary schools in the north east (NE) of England. The study procedures followed methods employed by the East of England Healthy Hearts Study in 10–16-year-old boys and girls based in the south east (SE) region of England and data were compared. Habitual physical activity (PAQ-A), vertical jump test, and hand-grip (HG) strength were assessed. We converted raw scores from all assessments to age- and sex-normalised z-scores. We recruited 597 children (58% boys) in the NE and compared findings to 597 age- and sex-matched boys and girls from the SE. Boys in the SE had significantly stronger HG scores, jumped higher, were more powerful (mean peak power: 2131?W vs. 1782?W; P?P?P?相似文献   

EWB在《电路分析》课程教学中的应用

电路分析是一门很重要的专业基础课,而利用EWB软件进行教学及模拟实验仿真可以提高学生的学习兴趣,让学生更直观的掌握电路分析的基本理论,更有利于培养学生的实践技能和创新能力,本文就如何在<电路分析>课程教学中应用EWB软件辅助教学进行探讨.     

论利用入侵检测保护路由基础结构免遭拒绝服务

当网络遭受拒绝服务时，信息包不能到达目的地：已有的路由协议不能很好地解决拒绝服务的问题。本文提出了路由基础结构拒绝服务的模型，同时描述了用入侵检测保护路由基础结构免遭拒绝服务的方法。     

基于两个GFSRG的组合随机数发生器

随机数是蒙特卡罗(Monte Carlo)方法的关键因素.首先给出一种广义反馈位移寄存器发生器及其缺点,然后在此基础上提出一种基于两个广义反馈位移寄存器方法的组合随机数发生器,最后给出一些严密的统计检验,结果证明这种组合随机数发生器不失为一种较好的随机数发生器.     

一类对称统计量的强相合性

考虑了一类有如下形式的对称统计量Tn=k(n-k) k(k-1)2-1∑n-ki=1∑i kj=i 1φ(Xi,Xj) ∑n-1i=n-k 1∑nj=i 1φ(Xi,Xj),这里φ(Xi,Xj)为一对称函数,其中k为不大于n的自然数.这一表达形式是一类统计量,当k=n-1时,它就是一U统计量.在假定E(φ2(Xi,Xj)≤M<∞下,研究了Tn的强相合性.     

中国奥林匹克数学教育发展现状析因

中国的奥林匹克数学教育发展异常的迅猛,其原因是多方面的,本文主要从奥林匹克数学教育对培养学生学习数学的兴趣、心理品质、思维品质的作用、与中学课程改革的关系以及与中国传统的考试文化之间的关系三方面进行分析,认为奥林匹克数学题目的特征及中国传统的考试文化共同影响着中国的奥林匹克数学教育发展．     

对提高艺术类专业统考评委素质的思考

目前艺术类专业统考就评委这个环节而言,存在着考前辅导学生现象普遍存在、遴选方法过于保守、个别评委法制意识淡薄、评判＂离群值＂偏高等问题。提高担任艺术类专业统考评委的个人素质,是解决上述问题的关键。为此必须改进评委遴选制度,确保评委的专业素养;完善评委培训机制,提高评委的评价能力;加强评委道德素质教育,增进评委廉洁自律意识;建立民意反馈机制,提升评委队伍的＂公信度＂。     

Area-time associated test cost model for SoC and lower bound of test time

A novel test access mechanism (TAM) architecture with multi test-channel (TC) based on IEEE Standard 1500 is proposed instead of the traditional sub-TAM structure. The cost model of an area-time associated test and the corresponding lower bound of system-on-chip (SoC) test time are established based on this TAM architecture. The model provides a more reliable method to control the SoC scheduling and reduces the complexity in related algorithm research. The result based on the area time associated test cost model has been validated using the ITC’02 test benchmark.