由元素周期表看门捷列夫

由元素周期表看门捷列夫华东师范大学（２０００６２）陆嘉星，朱仁康译在科学史上，俄国化学家门捷列夫获得元素周期表全部荣誉，但他是否该获此殊荣呢？１８６９年３月１日门捷列夫草草记下了他第一次对元素的粗略分类，现称为周期表，当时门捷列夫正在编写化学教科书《...     

门捷列夫发现元素周期律的历史考察

本文对门捷列夫发现元素周期律的历史作了全面考察,还对门捷列夫在科学结论上的特点及其缺陷作了比较详细的陈述、介绍和评价.     

门捷列夫与诺贝尔化学奖

学习化学应该建立元素观.门捷列夫最早发现元素周期律并排出第一张化学元素周期表.基于门捷列夫的贡献,迎来了物理化学发展史上的第二个春天.门捷列夫具有宽厚无私的个人魅力和渊博的化学知识,他富有远见地预测一些元素的存在和纠正当时科学界的一些谬见.他的成就是毋庸置疑的,曾获得1905年和1906年两届诺贝尔化学奖提名.     

工作到最后一天的门捷列夫

“什么是天才?终身努力,便是天才。”这是俄国著名的化学家德米特里·伊凡诺维奇·门捷列夫经常说的一句话。门捷列夫言行一致。他一生勤奋从事化学研究,终于发现了自然科学的重要定律之一——元素周期律,并据此预见了一些当时尚未发现的元素。它是门捷列夫在科学上最杰出的贡献。     

名人谢客妙法——不入耳

俄国著名化学家门捷列夫治学严谨,时间观念很强,几乎把每天的时间都安排得满满的。有一天,一个熟人到门捷列夫家里串门,他一坐下来就喋喋不休地讲个没完没了。直到说累了,才意识到自己的话可能太多,就问道:“我是不是使你感到厌烦了?”门捷列夫好一会儿才回过神来,说:“对不起,     

从一道新加坡高中数学考试题谈起

利用函数在特殊点的函数取值范围,判断函数待定系数满足的不等式,并引入门捷列夫的一个关于此类不等式证明的猜想,同时举例说明这种普通解题方法与门捷列夫猜想在实际解题中的应用.     

门捷列夫

今年2月8日是伟大的俄国化学家门捷列夫诞辰150周年。门捷列夫是化学元素周期律的发现者。周期律是近代化学的基础理论之一,它对化学哲学以及其它自然科学的发展都产生了极其深远的影响。因此恩格斯在《自     

纸牌中的秘密

1896年3月,俄国化学学会召开了一次学术讨论会。学者们有的带着论文,有的带着样品,有的带着自己设计的仪器当场实验,各抒己见,好不热闹。而彼得堡大学教授门捷列夫两手空空地静坐在室内一角,三天来不言不语。这天,眼看会议就要结束,主持人躬身说道:“门捷列夫先生,不知你有什么高见?”门捷列夫也不答话,起身走到桌子的中央,右手从口袋里抽出一副纸牌甩在了桌面上。门捷列夫爱玩纸牌,化学界的朋友都略有所闻,但总不至于到这个严肃的场合来开玩笑吧。等门捷列夫将纸牌一一亮给大家看时,人们才发现,这副牌并不是普通的扑克,每张牌上写的是一种…     

决胜高考化学重点知识精讲——元素周期表

正一、认识元素周期表1869年,一位俄国的化学家门捷列夫制定了世界上的第一张元素周期表。经过仔细的研究,根据元素的结构和性质,门捷列夫发明了元素周期表并且说明了元素及其化合物的规律。现如今人们所使用的元周期表几乎都是门捷列夫所制定的这种周期表,随着化学的进步与发展,元素周期表也越发完善。元素周期表就是用表格来表示元素周期律的一种具体形式,它反映了原子的结构以及元素之间的联系和它们的规律。元素周期表简称周期表。周期表有多种不同的表达形式,维     

周期性学说的历史考察

元素周期律和周期表是化学元素周期性学说的精华,这一伟大科学发现是门捷列夫的最高学术成果,它标志着门捷列夫已经根据当时自然科学所能达到的高度,在并不太长的时间内建立了自己的学说。而镓、钪、锗的发现,则给予周期律正确性以极其精彩的证明,使得当时的科学界终于确认了元素周期性学说。 正如一切科学理论的建立一样,周期性学说的发展也并非平坦。在门捷列夫建立周期系后,周期系自身便渐渐暴露了许多复杂的、难以找到答案的问题。这些问题基本上分属于两类,一类是周期性学说发展的初期(姑且称之为门捷列夫时期),这个时期周期性学说的理论依据     

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?     

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…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.