哈密顿体系在平面正交各向异性问题中的应用

通过引入对偶变量,将平面正交各向异性问题导入哈密顿体系,袖珍肉欧几里德几何空间向立辛几何空间的转换,从而使得分量变量及本征函数向量展开的直接解法得以实施,完成新求解体系的建立。     

基于关键能力培养的高三微专题复习教学实践——以“空间视角下的不变量分析”为例

基于高考评价体系、高考加强关键能力的考查,本文以“空间视角下的不变量分析”一课为例,探索高三二轮复习的教学实践,注重问题引领学生思维参与,着力培养和提升学生的数学关键能力.     

R4中二次曲面的不变量

对于三维欧氏空间中二次曲面的不变量,已经有过大量的详细的研究讨论,但对于高维空间中的二次曲面不变量却很少有人进行探究。为此,就针对四维欧氏空间中二次曲面的不变量进行了简单的研究。     

变量的作用域和命名空间的探讨

变量的命名空间是解决在同一作用域内同名成员引用的方法。主要讨论了C^＋＋系统中变量的生存期、作用域、可见性，命名空间、命名空间成员的引用方法和命名空间的别名等问题。     

利用空间中的动点解决立体几何求值问题

平面中的动点问题我们是比较熟悉的,在平面直角坐标系中,动点问题可以用二元方程来解决．而在空间直角坐标系中,动点的问题比较复杂一些,它是一个三元变量,不过空间直线、空间平面上的点还是可以转化为一元和二元变量的问题．     

教育实验空间变量的构成关系和特点

任何一个完整的教育实验,在空间上都必然涉及空间因素及其构成关系,否则实验就不能成立。教育实验的空间因素,大多能被称为“变量”。之所以这样称谓,是因为实验中的因素都是“可变的量”,可以根据研究需要进行“有或无”、“大或小”、“增或减”、“稳定或变化”的处理。教育实验正是通过对这些变量及其相互关系的观察与分析而得到对教育的规律性认识。掌握教育实验空间变量的构成关系和特点,对于进一步分析教育实验的变量有重要指导意义。一、教育实验的变量教育实验自身有其特殊的结构形式,并按照一定的逻辑程序进行。教育实验的结构是…     

完满正规空间的探讨

我们对完满正规空间进行了研究,证明了完满正规空间是闭lindel f映射下的逆不变量.     

对二组分固液体系相图中几个问题之管见

相图是描述多相平衡体系的状态同变量 T(温度)、P(压力)和 X(组成)之间的关系的一种几何图形,是相平衡的重要内容.不少学生由于缺乏空间概念和形象思维能力,对相图难以理解,因而出现了不少错误.下面仅以形成低共熔混合物的二组分相图为例,就学生容易出现的几个问题,谈点看法.1 相图及体系平衡状态的表示方法生成低共熔混合物的二组分体系的相图如图1所示.由相律可知f=K—φ+2=2—φ+2=4—φ1、当体系为单相时,φ=1,f=4—1=3,体系有 T、P、X 三个变量,为三变量体系,其状态用图1中曲面 aa′E′b′bEa 以上的空间表示.     

论教师培训核心要素的“对象变量”群

培训对象是教师培训核心要素之一,它表现出若干变量群。本文详细探讨了教师培训对象背景变量群、发展变量群和环境变量群,背景变量群包括自然变量、时间变量、文化资本变量、社会资本变量和政治资本变量;发展变量群主要有等级化的职称变量、层级化的荣誉变量、科层化的职务变量和资格更新变量;环境变量群不仅表现在学段、年级、学科等变量,也表现在空间和组织,甚至是行政区域变量。文章认为,“对象变量”群是教师培训项目设计的重要依据,直接影响到培训项目的需求、主题等要素。     

基于系统科学理论的组织效率演化动力系统分析

探索了增进经济组织效率的途径,借助系统动力学分析方法,分析组织的效率函数;在开放的系统中,引入时间及空间变量,分析组织创新演进的条件与传导机制。研究表明,健全的政策体系(即传输变换系统),使可能扰动本地区经济组织效率的信息熵不得进入,以消除负效率的传导,促进组织系统演化。     

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,     

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…     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.     

STORIES

正A One day a pig went to the stable(马棚)to see his good friend,an oldhorse,and was going to stay there forthenight.Night came and it was time forsleep.The pig went into the straw heap(稻草堆)and lay comfortably.A longtime passed,but the horse was stillstanding there and did not move.Thepig asked the horse why he did not go tosleep."Standing like this is the begin-ning ofsleeping,"answered the horse.     

巧妙引语(英文)

正1.Any fool can count the seeds in an apple.Only God can count all the apples in one seed.2.Happy families are all alike;every unhappy family is unhappy in its own way.3.Memories are the key not to the past,but to the future.4.Sometimes in the dark you see what you want to see.5.There is a great difference between     

Information for Authors

正Scope and Policy The Journal of Chongqing University-English Edition(JCQU-E)is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineering,biotechnology,mechanical and electrical engineering,computer and data processing,mining,metallurgy,materials science,and interdisciplines thereof.