首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
If you are a fan of science fiction, you’ve no doubt encountered the term nanotechnology, Yet over the past year also, a series
If you are a fan of science fiction, you’ve no doubt encountered the term nanotechnology, Yet over the past year also, a series
admin
2014-03-02
74
问题
If you are a fan of science fiction, you’ve no doubt encountered the term nanotechnology, Yet over the past year also, a series of breakthroughs have transformed nanotech from sci-fi fantasy into a real-world. Applied science, and in the process, inspired huge investments by business, academia, and government. In industries as diverse as health care, computers, chemicals, and aerospace, nanotech is overhauling production techniques, resulting in new and improved products, some of which may already be in your home or workplace.
The inspiration for nanotech goes back to a 1959 speech by the late physicist Richard Feynman, then a professor at the California Institute of Technology, titled "There’s Plenty of Room at the Bottom." Four decades later, Chad Mirkin, a Chemistry professor at Northwestern University’s $34 million nanotech center, used a nanoscale device to etch most of Feynman’s speech onto a surface the size of about 10 tobacco smoke particles.
What accounts for the sudden acceleration of nanotechnology? A key breakthrough came in 1990, when researchers at IBM’s Almaden Research Center succeeded in rearranging individual atoms at will. Using a device known as a scanning probe microscope, the team slowly moved 35 atoms to spell the three-letter IBM logo, thus proving Feynman fight. The entire Logo was less than three nanometers.
Soon, scientists were not only manipulating individual atoms but "spray painting" with them as well. Using a tool known as a molecular beam epitaxy, scientists have learned to create ultra fine films of specialized crystals, built up one molecular layer at a time. This is the technology used today to build read-head components for computer hard drives.
The next stage in the development of nanotechnology borrows a page from nature. Building a super-computer no bigger than a speck of dust might seem an impossible task, until one realizes that evolution solved such problems more than a billion years ago. Living ceils contain all sorts of nanoscale motors made of proteins that perform myriad mechanical and chemical functions, from muscle contraction to photosynthesis. In some instances, such motors may be re-engineered, or imitated, to produce products and processes useful to humans.
How are these biologically inspired machines constructed? Often, they construct themselves, manifesting a phenomenon of nature known as self assembly. The macromolecules of such biological machines have exactly the right shape and chemical binding preferences to ensure that when they combine they will snap together in predesigned ways. For example, the two strands that make up DNA’s double helix match each other exactly, which means that if they are separated in a complex chemical mixture, they are still able to find each other easily.
It can be inferred that Richard Feynman has been ______ now.
选项
A、dead
B、decent
C、prominent
D、popular
答案
A
解析
第2段中说late physicist Richard Feynman,late是“已故的”意思,也就是说Richard Feynman已经死了。所以选A。
转载请注明原文地址:https://kaotiyun.com/show/XjQO777K
0
考博英语
相关试题推荐
Anofficeisthe"brain"ofabusiness.Inanoffice,figures,listsandinformationarecompiledwhichtellthemanagersorhe
Mostnewwordsaremadeupfromotherearlierwords;language-makingisaconservativeprocess,wastinglittle.Whennewwordsu
Thesedayswehearalotofnonsenseaboutthe"greatclasslesssociety".Theidealthatthetwentiethcenturyistheageofthe
ThecharacterofEuropeaneducationdemandsthatthestudentdevelop【C1】______andsocialindividuality.TheAmericanstudentis
ThecharacterofEuropeaneducationdemandsthatthestudentdevelop【C1】______andsocialindividuality.TheAmericanstudentis
Toforgivemaybedivine,butnooneeversaiditwaseasy.Whensomeonehasdeeplyhurtyou,itcanbeextremelydifficulttol
Oh,whatanuisance!It______soeasyformetobringthosephotographsIwantedtoshowyou,andIhaveleftthemonthetablea
WhenDonaldarrivedforhisfirstgroup-therapysessionhewasinawheelchair,sufferingfrommalignantmelanomaandseverelyd
Consumersandproducersobviouslymakedecisionsthatmoldtheeconomy,butthereisathirdmajor【1】toconsidertheroleofgov
IworkasanofficeassistantinasmallbutgrowinggardenequipmentmanufacturingcompanyinCalifornia.Afewmonthsago,my
随机试题
吴某辞职引起的分配制度改革某电子公司是一家高新技术产品制造公司,在同行业中居领先地位。不久前生产技术部门有位既能干又技术水平高的年轻人吴某提出辞职,到提供更高薪资的竞争对手公司里任职。其实,吴某早在数月前就向生产技术部王主管提出给他提薪的要求,王
某人群某年糖尿病患者心肌梗死的死亡与总人群心肌梗死预期死亡的研究中,糖尿病患者心肌梗死死亡人数15000人,该人群预期死亡数为8000人。SMR等于
某男,48岁。因患急性化脓性阑尾炎,术后7天拆线,切口无红肿、无溶液、无压痛,应记录为
A、对革兰阳性、革兰阴性球菌、螺旋体等有效,对革兰阴性杆菌无效B、对革兰阳性、革兰阴性菌均有效的广谱半合成青霉素C、特别对铜绿假单胞菌有效D、主要对革兰阴性杆菌有效,对革兰阳性菌作用差E、耐酸、耐酶、对耐药金黄色葡萄球菌有效甲氧西林()
下面不算建筑面积的是()。
已知f’(0)=2,则=()。
某建设项目有关数据如下:1.建设期2年,运营期8年,固定资产投资总额5000万元(不含建设期贷款利息),其中包括无形资产600万元。项目固定资产投资资金来源为自有资金和贷款,贷款总额2200万元,在建设期每年贷入1100万元,贷款年利率为5.85
(2016年)2014年3月5日,机床生产商甲公司向乙公司出售机床20台,每台20万元。乙公司因资金周转困难,欲向丙银行贷款400万元,并与甲公司约定:“仅在乙公司的400万元银行贷款于2014年6月2日前到账时,机床买卖合同才生效。”2014年
(2016·河北)根据各主体之间的法律地位是否平等,教育法律关系可以分为()
有研究称,高纬度的强火山爆发可对全球气候系统造成多年影响。中国新闻网在报道中指出,科学家们认为,如果北半球高纬度地区夏季发生大规模火山爆发,那么便会造成北半球温度显著下降;火山爆发后8-9个月内,大气和太平洋洋流循环都可能因此产生变化,令大平洋中西部的信风
最新回复
(
0
)