狭义相对论时空理论教学体系的探讨

对狭义相对论中的时空性质和洛伦兹变换的教学内容作了不同于已有教科书的处理，从狭义相对论的两个基本原理出发导出“动钟延缓”、“动尺缩短”及“同时相对性”等三个时空性质，并在此基础上得到洛伦兹变换与间隔不变性，从而更好地体现狭义相对论中的物理概念和思维方法，此外还对理论物理教学改革中的有关问题作了探讨．     

相对论中间隔不变的表达式及应用研究

主要讨论了狭义相对论中时空间隔不变在直角坐标系中的三种表达式,分析了应用间隔不变处理经典时空性质和相对论力学问题容易产生的误区,提出了正确的解决办法。     

关于间隔不变性与洛仑兹变换的几点注记

两个事件之间隔不变性(Δs )2=(Δs)2是狭义相对论的两个基本原理与时空的均匀性及空间各向同性之直接推论;间隔不变性(ds )2=(ds)2=-dx μdx μ=-dxμdxμ给出闵可夫斯基四维空间的度规,决定了狭义相对论的时空性质;由于洛仑兹变换可由间隔不变性直接推出,所以,洛仑兹变换及伽利略变换都是对两个事件之空间、时间坐标差Δxμ与Δx μ而言的;有时,利用间隔不变性讨论问题比利用洛仑兹变换更简便.     

旋转位似的性质与主从联动法

<正>旋转和位似是中学几何教材中重要的图形变换之一,具有丰富的几何性质和广泛的应用.如果对于一种图形同时完成旋转和位似这两种变换,又有怎样的图形性质呢?下面给予有关探究与应用.1 旋转位似定义、性质(1)定义:把一个图形绕同一点旋转一定角度,并通过位似变换得到另一个图形称为旋转位似.(2)性质:①具有位似的一切性质,对应角相等,对应线段的比等于位似比.②旋转位似图形对应边平行或共线.③任意一对对应点到位似中心的距离     

广义相对论中的时空度量和光速

爱因斯坦引力几何化的思想是解决引力本质问题的关键,从而广叉相对论中的时空度量问题就是实现这一思想的核心问题;关于广义相对论中是否存在有如狭义相对论那样的"光速不变"问题,往往有着不同的说法,在此给出了说明.     

光速可变理论中局域Lorentz变换的错误,超光速和泛狭义相对论

证明由不同系统的局域Lorentz变换不能得到光速可变.基于狭义相对性原理必然得到一个不变速度ch.因此,狭义相对论基本原理应该严格地重新定义为：Ⅰ.狭义相对性原理,其必然导出一个不变速度ch.Ⅱ.假设理论中的这个不变速度ch是真空中的光速c.如果第二个原理不成立,例如存在超光速运动,则理论仍是形式相同,仅仅c→ch的泛狭义相对论.这是目前许多问题的一个最简单的修改.如果ch是各种不同的不变速度,则多时空体系相应于多世界.结合超光速等,发展理论的其他方法也被探索.光速可变理论应该联系于广义相对论.     

Maxwell方程组建立的探讨

从狭义相对论来看,运动电荷的电磁场效应应该是静止电荷的静电效应经历时空坐标变换得到的结果,所以描述电磁效应的方程组可以从静电现象通过相对论时空变换关系——洛仑兹变换得到,本文对此进行了证明。     

Milisavljevi不等式的加强及逆向

1978年,B.M.Milisavljevic建立关于三角形边长a、b、c与外接圆半径R、内切圆半径r的一个几何不等式[1]Rr≥31∑ba+c.(1)Milisavljevic不等式形式优美,且加强了著名的Euler不等式[2]R≥2r,引起了不少人的兴趣.1996年,宋庆先生撰文[2]指出,Milisavljevic不等式强于不等式Rr≥43∑b+ac;(2)该文中,作者建立了一个较(2)式强但与Milisavljevic不等式不分强弱的不等式Rr≥98???∑b+a c???2.(3)本文统一加强上述不等式,并给出一个逆向不等式.定理设a、b、c为△ABC的三边长,s、R、r分别为三角形的半周长、外接圆半径、内切圆半径,则29???∑s?a…     

类空事件先后顺序的几何描述

以光锥和二惯性系映射的几何方法结合洛伦兹变换 ,讨论了参考系变换下不同的时空区域中事件的时间顺序 ,直观的描述了狭义相对论的因果律     

巧妙沟通,有效建构——“长方形和正方形整理与复习”教学片段及思考

正一、教学片段片段一:整理沟通1.揭示课题:这节课我们共同整理和复习"长方形和正方形"这个单元.2.复习长方形的特征与周长计算.(1)出示一张长方形白纸(贴在黑板上),问:这张白纸是什么形状的?长方形有什么特征?这个长方形的周长在哪里,谁愿意来指一指.平面图形的周长指什么?(2)请同学们算出这个长方形的周长,现在好算吗?为什     

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?     

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.     

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.