演示实验的创新

目前教材中的演示实验其验证性成分多于探究性，且学生的参与力不够，使得演示实验没有发挥出良好的效果．我们创造性地改变了部分演示实验程序和实验装置，使演示实验学生化，多提供探索性问题，注重分析实验过程及出现的异常现象，提高演示实验的探索性和研究性．     

一种基于Web虚拟现实的演示实验研究

本文针对传统演示实验的缺点提出了一种基于Web虚拟现实的演示实验方案，探讨了虚拟演示实验系统的逻辑结构、建模方法与实现技术，为课程教学提供了一种新的实验演示方法和手段。     

浅谈初中生物教学中的演示实验

由于中学生物演示实验的现状为：忽视了演示实验；该文通过课堂演示实验的艺术性：验证式实验、同步式实验、探索式实验等，揭开了课堂演示实验教学的重要意义。     

如何发挥演示实验在物理教学中的作用

演示实验是物理教学中不可缺少的环节，要充分发挥演示实验在物理教学中的作用，我们应做到：演示实验要有明确的目的；演示实验要明显和直观；演示实验要力求简单可靠，并做好充分的准备；要指导学生观察实验，所选演示实验要富有启发性。     

重视演示实验改善教学效果

演示实验是借助直观教具在课堂上进行的教学实验．做好演示实验将为改善课堂教学效果奠定良好的基础．因此应给予充分的重视。文章对演示实验进行了分类，阐述了演示实验教学的基本要求和注意事项，讨论了通过演示实验教学提高学生的观察能力、思维能力和实验能力。     

初中化学概念教学之我见

在初中化学课本中．基本概念几乎每节都有，而在化学教学实践中，学生由于基本概念不明确而影响化学成绩的提高。如何讲清化学基本概念，我是采用如下几种方法的。互．借助演示实验讲清苦本概念演示实验生动直观，它能使学生获得深刻的印象。课本中有很多基本概念都有相应的演示实验，一般来说，演示一个实验，讲清一个概念。但有的是演示一个实验可讲清几个概念。如演示了镁在空气中燃烧一个实验，可以讲情“化学变化”和“化学性质”两个概念。甚至有演示一个实验可以讲清三个概念的。例如演示了配制NaCI溶液一个实验，可以讲清“溶液”…     

提高演示实验可见度的方法

在初中物理实验教学中，演示实验占有较大的比重。因种种原因，演示效果往往大打折扣，达不到演示实验的预期效果和目的，本人通过15年的教学实践，在演示实验教学实践中不断思考和改进，形成了一些提高演示实验效果的方法和手段，现提出来与同行商榷。     

中学物理演示实验要突出科学探究

以新的教育理念，从重新定位演示实验功能的角度，研究了演示实验与科学探究的整合，探讨了在演示实验中如何体现以学生为主体的教育思想。     

中学物理演示实验要突出科学探究

以新的教育理念，从重新定位演示实验功能的角度，研究了演示实验与科学探究的整合，探讨了在演示实验中如何体现以学生为主体的教育思想。     

谈谈高中化学演示实验

在高中化学新教材中，增加了较多的演示实验。经调查，在有演示实验的课堂教学中，主要存在以下几个问题：①不做演示实验，由“讲实验代替做实验”。这是教学态度问题，在老教师中比较多见。②做了演示实验，没有可见度，做前排同学连药品、仪器都看不到。这是教学质量问题，在新教师中较多见。③老师包办演示实验。好像规定了演示实验就是老师做，不能学生做。这是教学观念问题，这在新老教师中都存在。为此我有如下体会和看法：     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.