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1.
通过对金属钠包裹方法的改进,使钠与水反应实验操作得到简化,比原来的实验操作方法更加简单易行,并且实验的安全性得到了加强,消除了实验安全的隐患.  相似文献   

2.
微型化学实验的显优点使它在国际上得到广泛应用,笔对微型实验进行两年多的学习实践,认为微型化学实验有利于探究式学习,得到学生欢迎,值得推行。  相似文献   

3.
从沉积在液体基底上银原子的凝聚实验规律出发,对凝聚机理进行研究,提出了凝聚速率的几率模型,给出了由该几率模型所得到的结论,并对不同沉积速率下所得到的结论与实验数据进行比较,得到与实验数据相一致的结果。  相似文献   

4.
实验教学中采用微型化学实验,对培养高师学生的自身素质,有着重要的意义.通过开展微型化学实验使学生的实验技能和创造能力得到提高,创新意识和环保意识得到增强.  相似文献   

5.
高一教材学生实验“实验一化学实验基本操作(一)”中制取氧化铜时,实验步骤出现了一些问题:有些学生将NaOH溶液向CuSO4溶液中加入时,得不到期望的蓝色沉淀Cu(OH)2,而是得到了蓝绿色物质或深蓝色物质;有些学生加热很长时间也得不到黑色的CuO,而是得到了蓝绿色的物质;有些学生加热得到了黑色的氧化铜,但量很少。那么导致以上问题的原因是什么呢?为得到纯净的氧化铜,我进行了下列的实验研究。  相似文献   

6.
植物学教学涉及大量实验,通过学生亲自动手参与实验,不仅能激发兴趣、巩固知识,而且能使多种能力得到培养,但是教材所采用的很多实验材料由于本身的局限性,不易得到,难以满足当前的教学需要。在教学实践中,我发现一种垂手可得而且效果很好的多用实验材料——大叶黄杨。  相似文献   

7.
高中《物理》(必修)第一册第四章学生分组实验“验证机械能守恒”,对于实验数据分析,教材要求学生选择点迹清楚且第一、二点间距离接近2mm的纸带进行实验结果分析.但在实验中发现好多组学生不能得到这样的纸带,有的学生得到的纸带第一、二点距离在3~4mm,学生得到这样的纸带后,  相似文献   

8.
李斌 《辽宁教育》2007,(4):41-44
数学实验教学中,学生通过“创设情境,提出问题——实验探索,形成结论(实验感知,形成猜想——实验探索,验证猜想——合作交流、归纳绪论)——实践运用.解决问题——总结反思.评价体验”的基本流程主动地进行观察、实验、猜想、验证、推理与交流等数学活动.改变了学习教学的方式:由“听数学”变为“做数学”;由“看演示”变为“动手操作”;由“机械接受”变为“主动探究”。学生在数学实验活动中。主体作用得到充分发挥,体验到发现知识的乐趣。探究能力得到提高.实践能力得到增强,创新能力得到培养,思维能力得到发展。  相似文献   

9.
本文以培养学生创新能力为目标,长期开展实验教学和实验管理体系的创新研究与实践,使得教学内容、方法得到改进,实验管理上了台阶,学生创新能力得到了培养,教学和管理取得了初步成果。  相似文献   

10.
介绍了师专有机化学实验与中学化学实验,以及与生活实际联系的教学经验,改变了有机化学实验与中学化学实验脱节的现象。学生通过有机化学实验的学习,分析问题、解决问题的能力得到加强。  相似文献   

11.
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。  相似文献   

12.
《海外英语》2007,(5):44-45
It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,  相似文献   

13.
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/  相似文献   

14.
《海外英语》2007,(5):10-11
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?  相似文献   

15.
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  相似文献   

16.
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.  相似文献   

17.
《海外英语》2007,(4):36
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.  相似文献   

18.
王菲 《华章》2007,(12):273-273
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.  相似文献   

19.
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!  相似文献   

20.
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.  相似文献   

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