The Shape of the Earth

Teacher: Tony! What’s the shape(形状) of the earth?Tony: It is round.     

地球自转对地球形状影响演示仪

地球的形状主要是由地球引力和自转产生的离心力决定的.地球在自转时,由于不同纬度处的速度不一样,在两极处速度最小,在赤道处速度最大,它们产生的惯性离心力也就不同,在这种自转作用下,必然使地球成为一个在靠近赤道处向外凸起的椭实验教学方法     

地球的瞬时迹面

将地球简化为做定点运动的刚体时,其运动方程可积分的情况,有且只有一种,即Lagrange-Poisson情况,在其解算过程中,从数学方法上衍生出来的Euler-Poinsot情况,并非独立情况,而是由前一种情况派生出来的.     

土质学与土力学测试与指导课件的开发与研制

本文讨论了开发土质学与土力学课程测试与指导课件 (SMCAI)的意义和课件开发研制的指导思想 ,同时 ,介绍了SMCAI软件的特点及其在土质学与土力学教学领域中的应用     

《土里的鱼》的象征寓意

夏天敏的新作<土里的鱼>描述了高原贫困山区农民的生存现状,传达出了贫穷落后的弱者企求改变命运的强烈渴盼和由此产生的迷狂式幻想.作者采用了象征寓意的手法,通过艺术的夸张和写照,表达出了作者对山区贫困农民的悲悯、伤感和批判.     

The records of planet Earth

Have a look at the geographical areas on this map. Can you see the deserts, forests and mountains? We’ll show you some of the world’s amazing records.     

地球日的历史

在1963年，前议员Gaylord Nelson开始为地球而忧虑。Gaylord Nelson知道世界变得越来越脏，许多动物和植物都死棹了。他想了解为什么很多人不愿解决这个问题。     

地球上的生命起源

今年恰逢查尔斯·达尔文发表《物种起源》150周年,科学家们在揭示生命如何起源于非生命物质方面实现了里程碑式的进步。一队英国化学家展示了温暖的有机化学物质液体中能自然地形成组成生命的基础物质。     

The search for another Earth

Is there life anywhere else in the vast cosmos? Are there planets similar to the Earth? For centuries, these questions baffled curious minds. Either a positive or negative answer, if found one day, would carry a deep philosophical significance for our very existence in the universe. Although the search for extra-terrestrial intelligence was initiated decades ago, a systematic scientific and global quest towards achieving a convincing answer began in 1995 with the discovery of the first confirmed planet orbiting around the solar-type star 51 Pegasi. Since then, astronomers have discovered many exoplanets using two main techniques, radial velocity and transit measurements. In the first part of this article, we shall describe the different astronomical methods through which the extrasolar planets of various kinds are discovered. In the second part of the article we shall discuss the various kinds of exoplanets, in particular about the habitable planets discovered till date and the present status of our search for a habitable planet similar to the Earth.     

The Song of the Earth: A pragmatic rejoinder

In The Song of the Earth, Jonathan Bate promotes ‘ecopoesis’, contrasting it with ‘ecopolitical’ poetry (and by implication, other forms of writing and expression). Like others recently, including Simon James and Michael Bonnett, he appropriates the notion of ‘dwelling’ from Heidegger to add force to this distinction. Bate's argument is effectively that we have more chance of protecting the environment if we engage in ecopoetic activity, involving a sense of immediate response to nature, than if we do not. This has obvious educational implications. If Bate, James and Bonnett are correct, then the educational pursuit of (eco)poetic sensibility will, of itself, contribute to education for a sustainable future by grounding human experience in nature; if their assertions are insupportable, and (eco)poetic sensibility does not afford privileged access to a state of nature, then the assumption cannot be made that the development of such sensibility will contribute to education for sustainability. I shall critique Bate's argument from a pragmatic perspective.     

关于武术女运动员身体形态研究

通过对武术专业女生的形态学测量与统计,为武术女运动员选材提供参考。     

未来车辆

英国威尔士的Naro汽车公司研发出一款外形很酷的新型车, 它集摩托车和小汽车的特点于一身。对英国的上班族、出租车以及快递公司总是希望有什么办法能解决交通拥堵和车位紧张的问题。这款只有一米宽的Naro     

Protecting the Earth

<正>The earth is in trouble now!We need to take measures to protect the environment.Recycling is a great way to save energy,space and money.However,recycling is not the only way to protect the environment.For example,we can save water by taking shorter showers.It is also important for us to use reusable bottles for drinks and have our lunch in reusable bowls.     

Saving the Earth

As time goes by,humans are making the earth sick.People cut down too much trees ① and leave more and more rubbish here and there.Factories let out their waste without doing anything to it.All this has caused many serious problems.More and more good farmland has turned into desert,the rivers and lakes have polluted② and the water in them is dirty and poisonous.The air is less clean,even the temperature of the earth is higher than before.The earth is sick now.What should we do to save her?     

地球微扰轨道闭合的充分条件

地球绕太阳的轨道运动,受到其他天体作用力影响,轨道运动必然发生微扰,当微扰相当明显时,轨道仍能闭合的充分条件是什么?很值得讨论.     

数形结合思想在《数列》教学中的应用

对数形结合思想在数列教学中的应用从三方面给予论述,使学生对数形结合这一基本数学思想有更深刻的理解和认识,优化学生的思维品质,提高解题能力。     

论唐传奇的悲剧美

悲剧意识的渗入使唐传奇具有浓厚的悲剧色彩,具体表现为生离与死别。这类悲剧作品不仅具有诗赋的诗境美与语言美,还表现了细腻的人物刻画与细节刻画,呈现出一种立体而多面的独具魅力的悲剧美。     

稀土开发和应用的现状及其发展

本文介绍了稀土元素性质和稀土工业的发展,国内外销售状况,应用和发展趋势。稀土工业的发展一是依赖于稀土应用扩大和分离技术的提高,二是依赖于稀土产品的畅销。为适应我国贯彻稀土应用方针,着重研讨了稀土在冶金、机械、石油、化工、玻璃陶瓷、高技术领域和农医等方面的应用。     

从后殖民主义角度解读《大地》

《大地》以二十世纪初的中国社会作为背景,讲述了王龙一家在各种灾难中挣扎抗争的故事,它真实地反映了中国农村的面貌以及人与土地的密切关系.本文采用后殖民主义理论视角,从《大地》的主题、女性地位以及生活文化等方面分析作品的后殖民主义特征,并从赛珍珠的双重文化身份探究了她创作的动机,最后指出《大地》是传播中国文化的伟大作品,它架起了中西方文化交流的桥梁.