tired

摘要： October 12th,1492 Christopher Columbus,a famous Italian explorer,landed in America.On August 3rd,1492,Columbus and his men set sail from Spain with three small ships.It was a rough voyage[1].Some men soon became tired and sick.

摘要： The Intergalactic Medium (IGM) is commonly thought to be occupied by approximately one atom of Hydrogen per cubic metre of space either as neutral Hydrogen or partially/fully ionised. This cannot be true as galaxies will “boil off” electrons from their outer surfaces by the photo-electric effect and so the IGM must be filled with electrons. UV and X-ray photons, as they leave the galaxy, can remove an electron from a Hydrogen atom at the surface of the galaxy, give it sufficient energy to escape the gravitational pull of the galaxy and go on to fill the IGM. A typical galaxy emits approximately 5×1047 X-ray photons each second. All of which pass through the outer surface of the galaxy and have sufficient energy to eject an electron and send it off to the IGM. Adding to these photons in the UV and gamma, we can see that galaxies are ejecting large amounts of electrons each second that go on to fill the IGM. Data from FRB 121102 give the value for the electron number density in the IGM as ne ≈ 0.5 m-3. Under certain conditions, an electron gas will crystallise into a Wigner-Seitz crystal. Here the electrical potential energy of repulsion between the electrons dominates their kinetic energy and the electrons form on a BCC lattice structure. The electrons oscillate, performing SHM about their lattice positions. With ne ≈ 0.5 m-3 the electrons in the IGM satisfy the energy criteria for crystallisation to occur when interacting with other electrons within a sphere far less in radius than the corresponding Debye sphere. Thus, the conditions are met for the electrons to form an “electron glass.” Since the electrons in their BCC formation are spatially coherent, light will travel through the crystals in a straight line and thus objections to “Tired Light” theories are now removed since images will neither be destroyed nor “blurred.” Charges are not created but separated, if the electrons are removed from the galaxy and sent to fill the IGM;the remaining protons are left behind. These are “thermal” and will not have sufficient energy to escape but will be held gravitationally to that galaxy. Could these too form a spherical Wigner-Seitz sphere around that galaxy? Since the structure would be transparent, light would pass through in straight lines and thus we would not see it. They would however, interact gravitationally with the galaxy and have an effect on the rotation curves of single galaxies and on the motion of galactic clusters. Just as we cannot see the clear water in a fish tank when we look at the fish, the transparent, crystalline sphere of protons around galaxies would be “dark”.

摘要： 课题:《新标准英语》一年级起点第三册Module 4 Unit 1 What’s the time?教学内容:本单元重点学习时间的问句和整点的时间回答。学生在学完该单元后,能够描述整点时间,学生能看时间用英语表达的习惯。本课时是该单元的第一课时,主要是对话的学习。教学目标:表达整点的时间。培养学生看时间用英语表达的习惯。教学重点:What’s the time?It’s 2 o’clock.

摘要： 一些教师在小学英语单词教学中存在"就词解词"的现象,造成了小学生单词学习的枯燥化。枯燥化的单词教学现象不仅严重地挫伤了小学生的英语学习积极性,而且浪费了小学生大量的英语学习时间。在"学为中心"的课堂教学背景下,教师要善于根据小学生的认知特点,借助有效情境趣化单词教学,让英语单词教学还本求真。一、借助生活情境,"趣化"单词教学《英语课程标准》特别强调生活化的英语教学,要加强英语教学与生活的联系,以此提升小学生的英语学习积极

摘要： 1.An old man loves his white cat very much and gives it the most delicious food every day.有个老头十分喜欢他养的那只白猫,天天给它吃最好的东西。2.One day,he sees a woman carrying a beautiful yellow cat,thinks that"If I could have a yellow cat..."这天,老头看见一妇人抱着一只漂亮的黄猫,心里直痒痒":要是我也有只黄猫就好了……"

摘要： 探究是一个发现过程,指让学习主体能在情境中通过自主观察、阅读等而发现问题并思考问题的解决办法,以此而获得发现的过程。探究式教学就是要教学中以情境而激发学生的探究兴趣,引导学生进入到探究过程中,能主动去观察、阅读,主动参与到英语学习过程中,在探究中获得英语知识的构建,在探究活动中培养学生的英语综合应用能力的教学方法。探究式教学彻底打破了传统英语"我讲你听"的模式,把学生真正立于学习者的地位,教师更多地是在课堂中去

摘要： 词汇是组成语言体系的重要载体,小学英语词汇教学是英语教学的重要组成部分,教好词汇是小学英语教学走向成功的前提。因此,处理好词汇教学对于学生学好英语至关重要。在牛津小学英语教材中,词汇作为一个独立的板块被编排在了每一个单元的B部分。且每一单元的词汇间均存在着一定的联系。

摘要： 在学习非谓语动词时,动词不定式是一个重点,也是一个难点。对于它作主语、宾语、表语、定语、补足语等的用法大家应该不陌生,本文跟大家一起探究不定式作状语的情况。一、不定式作目的状语(一)不定式作目的状语的位置不定式作目的状语可以置于句首或句尾,在句尾时,与句子之间不用逗号隔开,在句首时,可以用逗号隔开。例如: