笔记本电脑电池简介

电池是体现笔记本电脑便携性的重要组件,笔记本电脑使用的电池主要有4类:镍镉电池、镍氢电池、锂离子电池和锂聚合物电池。简要介绍了这4类电池的组成、性能和工作原理,并介绍了将会普及使用的燃料电池。     

大学生如何选购笔记本电脑

现在的大学生基本都会拥有自己的电脑,考虑便携性等因素,大多数的学生都会选择更加小巧方便的笔记本电脑。但是由于现在笔记本电脑的品牌和性能的多样性,很多学生在选购笔记本电脑的时候感到迷茫和困惑。本文就这个问题,给予几点关于笔记本电脑选购方面的建议。     

笔记本电脑的维护与保养

如何维护保养笔记本电脑是每一个笔记本电脑用户关心的话题，本针对一般笔记本电脑的维护和保养提出了一些合理化建议。     

两千元买个笔记本电脑!——千元笔记本电脑抢鲜评测

2000元能买一台笔记本电脑，而且还是鼎鼎大名的英特尔出品!是的，你没有看错。英特尔针对学生市场，推出了代号为“Classmate PC”的学生笔记本电脑。 它为什么那么便宜？性能到底怎么样？让我们来看看新鲜出炉的评测怎么说![编者按]     

五款高性价比笔记本电脑评介

索尼VAIO VGN-C22CH笔记本电脑；华硕F5R F5Q20R-DR笔记本电脑；联想昭阳E290（MC430X4256060BXb）笔记本电脑；长城 T60 H16AJUV笔记本电脑；宏基（Acer）Aspire5583笔记本电脑。     

笔记本电脑养护法宝

爸爸有台笔记本电脑,他为了保持和延长电池的寿命,平时接电源时就把电池下掉。一段时间过去了,当他再装上电池时,没想到电池反而坏了无法使用。经咨询电脑维修人员,才知道笔记本电脑的电池不仅不会发生过度充电现象,而且在长期不使用时1个月还要充电1次,     

基于压力传感器的笔记本电脑防盗报警装置简

针对笔记本电脑安全防盗问题,设计了一种采用压力传感器的笔记本电脑防盗报警装置．通过压力传感器感知笔记本电脑对散热架的压力产生的形变,转化为相应的电信号,然后经过信号处理,实现笔记本电脑的防盗功能．该报警装置结构简单、成本低廉,具有较高的实用价值,适合于产业化生产．     

《大漠孤烟》答友人问

华艺出版社 2 0 0 1年 8月推出一部“文革”题材的长篇小说《大漠孤烟》 ,甚受社会关注 ,不少读者向作者提出了许多问题要求回答。作者某日接待了一位来访者 ,根据录音整理出了这篇访谈录 ,现发表出来以飨读者。文中□代表来访者 ,■代表小说作者。□翻开《大漠孤烟》 ,赫然在目的是季羡林先生的《序》。季先生似乎从未给小说作过序。您如何竟有如此之幸 ?■这固然是个人之幸 ,拙著之幸 ,但不仅如此。季先生是学界泰斗 ,中国知识分子的良心 ,他关注学界一切有价值的东西。他虽然没给长篇小说写过序 ,但他本人不仅是大学问家 ,也是外国文学翻…     

A Simple Answer to a Simple Question on Changing Answers

In an article in the Winter 2011 issue of the Journal of Educational Measurement, van der Linden, Jeon, and Ferrara suggested that “test takers should trust their initial instincts and retain their initial responses when they have the opportunity to review test items.” They presented a complex IRT model that appeared to show that students would be worse off by changing answers. As noted in a subsequent erratum, this conclusion was based on flawed data, and that the correct data could not be analyzed by their method because the model failed to converge. This left their basic question on the value of answer changing unanswered. A much more direct approach is to simply count the number of examinees whose scores after an opportunity to change answers are higher, lower, or the same as their initial scores. Using the same data set as the original article, an overwhelming majority of the students received higher scores after the opportunity to change answers.     

2006年高考物理压轴题两条思路答案不同的剖析

2006年全国卷Ⅰ,物理压轴题25题如下:有一个演示实验,在上下两面都是金属板的玻璃盒内,放了许多用铝箔纸揉成的小球,当上下板间加上电压后,小球就上下不停地跳动.现取以下简化模型进行定量研究.图1如图1所示,电容为C的平行板电容器的极板A和B水平放置,相距为d,与电动势为ε、内     

Evolution of a laptop university: a case study

Technology is integral to carrying out many types of business transactions and has become entwined in the very fabric of everyday life. In the educational environment—particularly higher education—technology is underutilised as a pedagogical tool and in many cases remains largely untapped. Winona State University and its laptop programme learned some valuable lessons from the marriage between the application of the Seven Principles of Good Practice in Undergraduate Education and technology. The transformation into a leading laptop university was neither smooth nor easy, but it is a successful case about principle‐centred technological change and improved student learning outcomes.     

名师解疑

上海环球雅思学校首席雅思及新托福听力．阅读主讲．沪上著名国外考试培训『专家，国内最早从事雅思、新托福应试研究及培训的名师之一。上海财大国际金融硕士、上海交大管理学博士。英语实战经验丰富．雅思听说读写同时8分．新托福110分．一次性通过上海高级口译。即将出版《名师讲真题——雅思高分作文解析》（机械工业出版社）。     

时文选读

What is the difference between a sailor and some broken clocks?     

"书札"质疑

本文对《三国志》《谯周传》中谯周“尤善书札”提出质疑，从谯周的师承传授、著作情况以及“礼”字的写法等方面作出考察。认为由于“札”与“礼”字形近似，造成书写之误，“书札”即为“《书》《礼》”。     

OBE: Some Answers for the Uninitiated

In this article, leaders of the North Carolina Writing Project explore whether students of teachers who attended Writing Project summer institutes out-performed other teachers' students on state writing tests. The authors accordingly developed a test to compare the writing of those students with the writing of students of non-writing project teachers. The test, however, produced no significant difference in the writing of the two groups. Seventeen years later, the authors compared the longevity of writing project teachers with that of comparable non-writing project teachers to see if the institutes infused a spirit of professionalism and self-efficacy in participants that other teachers did not possess. This comparison affirmed the authors' beliefs: writing project teachers had greater staying power than comparable teachers.