2014年职称英语理工类教材学习部分内容及解析
1. Scientists recently made public the tiniest electric motor ever1 built. You could stuff hundreds of them into the period at the end of this sentence. One day a similar engine might power a tiny mechanical doctor that would travel through your body to remove your disease.
2. The motor works by shuffling atoms between two molten metal droplets in a carbon nanotube. One droplet is even smaller than the other. When a small electric current is applied to the droplets, atoms slowly get out of the larger droplet and join the smaller one. The small droplet grows - but never gets as big as the other droplet - and eventually bumps into the large droplet. As they touch, the large droplet rapidly sops up the atoms it had previously lost. This quick shift in energy produces a power stroke2.
3. The technique exploits the fact that surface tension -- the tendency of atoms or molecules to resist separating -- becomes more important at small scales3. Surface tension is the same thing that allows some insects to walk on water.
4. Although the amount of energy produced is small -- 20 microwatts -- it is quite impressive in relation to the tiny scale of the motor4. The whole setup5 is less than 200 nanometers on a side, or hundreds of times smaller than the width of a human hair. If it could be scaled up to the size of an automobile engine6, it would be 100 million times more powerful than a Toyota Camrys 225 horsepower V6 engine.
5. In 1988, Professor Richard Muller and colleagues made the first operating micromotor, which was 100 microns across7, or about the thickness of a human hair. In 2003, Zettls group created the first nanoscale motor. In 2006, they built a nanoconveyor, which moves tiny particles along like cars in a factory.
6. Nanotechnology engineers try to mimic nature, building things atom-by-atom. Among other things, nanomotors could be used in optical circuits to redirect light, a process called optical switching. Futurists envision a day when nanomachines, powered by nanomotors, travel inside yur body to find disease and repair damaged cells.
词汇:
shuffle v. 来回运动
nanometer n. 纳米,毫微米
molten adj. 熔化的
micromotor n. 微电机
droplet n. 小滴
nanotube n. 纳米管
nanoconveyor n. 纳米传送带
nanotechnology n. 纳米技术
bump v. 碰撞
mimic v. 模仿
sop v. 吸入
stroke n. 行程,冲程
microwatt n. 微瓦
nanomotor n. 纳米发动机
nanomachine n. 纳米机器
英文简历必备:求职信模板(一)
面试英语:求职新招数 网络“微求职”流行
面试英语:十招搞定面试
面试英语必备:外企求职面试时禁忌的问题
面试英语通关攻略:助你脱颖而出
英语面试必备:找一份好工作的秘诀
职场英文简历:会计
面试英语必备:如何准备面试复试
求职必备:英文简历-后勤
英文简历必备:求职信模板(四)
面试英语必备:外企英语面试的七个要点
英语面试必备:给英语专业求职的几点建议
英文简历范例:培训协调员
职场英文简历:市场主管
面试英语必备:外企面试禁忌问的问题
英语面试必备:外企求职面试常见的场景对话
求职中五种做法透露出你不够专业
英文面试中如何有效的”推销“自己
面试英语:HR告诉你怎样从700万毕业大军中突出重围?
英语面试必备:十种外企面试类型
求职必备:英文简历-管理员
求职必备:英文简历-(工业工程师)INDUSTRIALENGINEER
英语面试必备:英语专业就业面狭窄,就业形势不容乐观
英语电话面试问题集锦
求职必备:英文简历-经理助理
面试英语:外企面试之上网如何找工作
英文简历必备:求职信模板(五)
面试英语:面试中不要问的10个糟糕问题
求职必备:英文简历-(律师)ATTORNEY(CivilLaw)
求职必备:英文简历-(销售助理)SALESASSIST
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |