几个初中物理实验的对比

人教版初中物理教材中有24个比较重要的实验,虽然各个实验的实验目的不同,但有些实验所用的器材却相同;有些同一个实验却可以依据不同的实验原理,选用不相同的实验器材;还有些实验虽然实验器材和实验目的都不相同,但实验的设计方法却相同.我们把这三类实验进行分析对比,以引导学生加深对实验的理解.一、实验器材相同,实验目的不同的实验有些物理实验,尽管用的实验器材相同,但由于     

生物学实验题实验步骤解答技巧

一个完整的生物学实验题考查内容包括：实验原理、实验目的、实验假设、实验步骤、实验现象、实验结果分析以及实验结论的获得,甚至包括实验前准备。其中实验步骤是一个实验的中心环节,是利用实验原理获得实验结论或者验证实验目的的过程,几乎是每年生物学高考所有实验题都会涉及到的内容。     

改进实验形式 提升实验品质

实验是形式和内容的统一体,实验的形式和内容又是对立统一的。通过更新实验形式,改验证性实验为探究性实验,改演示实验为师生协同实验,改固定实验小组为自由结伴小组,改教师提供材料为学生选用材料,改课内实验为课前课后实验,改封闭性实验为开放式实验。改只重操作结果为重操作过程,可以有效地完善实验的内容,提升实验的品质,增强实验的效果。     

谈预实验在初中生物实验教学中的作用

由于现行初中生物教材中实验的数量大幅度增加,对实验能力的要求也显著提高,有的实验内容对于教师来说是首次接触,要保证实验成功,做好生物预实验就显得尤其重要。所谓预实验,是指在进行科学研究时,在正式实验前进行的实验。预实验可以使教师了解实验的内容、实验的条件并可以验证实验原理、估计实验误差、确定实验结果,同时还可以了解实验中可能出现的问题及解决方法,从总体上把握实验的内容及要求。     

高中物理演示实验教学的创意设计

演示实验是高中物理实验教学的重要组成部分.因此教师应关注物理演示实验教学的创新优化,并以创设实验情境、增加实验互动、强化实验思考、培养实验能力为导向,对演示实验的实验内容、实验环节、实验问题、实验空间开展创意设计,如此可提高物理演示实验的教学品质.     

再谈物理演示实验的六大改变

本文在笔者已发表的单个实验到连环实验,结论实验到过程实验、"完美"实验到不成功实验、单科实验到跨学科实验、"平淡"实验到"刺激"实验、平面实验到竖直实验六个方面改变的基础上,从另外六个方面再谈物理演示实验的改变。     

如何做好初中物理探究题

初中物理实验题要抓住实验目的,所有的实验都是围绕实验目的进行的。实验在物理这门课中具有十分重要的位置,它是物理知识的重要组成部分。学习物理,要高度重视实验。教材中的实验探究、小实验要尽可能自己动手做。要逐步学会根据实验的目的选择实验仪器、设计实验方案、按规则进行实验,以实事求是的科学态度分析实验现象和实验数据、得出实验结论。     

例谈中学物理实验条件的控制

物理实验中,控制好实验的条件是获得成功实验的关键．实验条件的控制是指在实验开始前、实验过程中以及实验结束时对实验装置与环境的控制．下面笔者就中学物理实验中如何控制实验条件进行探讨．     

学生化学实验能力的培养初探

化学是一门实验性很强的基础学科,通过教师演示实验、观看实验录像和学生实验操作,培养学生的实验能力。本文简要叙述了通过创设趣味实验、投影演示实验、组织分组实验、利用选做实验、布置实验作业、做家庭小实验等六个方面培养学生实验能力的方法。     

初中化学实验的微型化教学研究

初中化学中的微型实验主要是指利用少量的试剂、小型的装置和仪器进行化学实验.在微型实验中有很多的注意事项,教师按照实验目的、实验用品、实验过程、实验现象、实验结果的方式进行教学,能够提高微型化学实验的效果.一、初中化学微型实验的实践需要1.微型实验让化学实验更加普及化学微型实验对于场地、条件、温度、设备等的要求都有所降低,学生可以在进行实验的时候减少了众多的限制条件,更加有利于学生方便的操作化学实验.2.微型实验有助于环保意识建设通常化学实验会产生很多的污染,这也是化学实验     

汉字倒说

汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。     

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,     

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?     

钱生钱!

我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了     

Inequalities for inscribed simplexes

The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex.     

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.     

微薄的薪水,高尚的情操

现在,我们可以没有面包,没有钱,没有房子,没有车子……但我们唯独不能丢失的是高尚的情操,笃定的信念,还有,满满的希望!     

Virtual reality approach for 3D large model browsing on web site

Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching.