首页
登录
职称英语
If you are a fan of science fiction, you’ve no doubt encountered the term nan
If you are a fan of science fiction, you’ve no doubt encountered the term nan
游客
2025-04-13
29
管理
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. [br] 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://tihaiku.com/zcyy/4036091.html
相关试题推荐
Atthefall2001SocialScienceHistoryAssociationconventioninChicago,t
Atthefall2001SocialScienceHistoryAssociationconventioninChicago,t
Atthefall2001SocialScienceHistoryAssociationconventioninChicago,t
Atthefall2001SocialScienceHistoryAssociationconventioninChicago,t
Atthefall2001SocialScienceHistoryAssociationconventioninChicago,t
Manyobjectsindailyusehaveclearlybeeninfluencedbyscience,buttheir
Manyobjectsindailyusehaveclearlybeeninfluencedbyscience,buttheir
Manyobjectsindailyusehaveclearlybeeninfluencedbyscience,buttheir
A、ambitionB、conscienceC、responsibilityD、challengeCambition意为“抱负,雄心”;conscien
Engineeringistheprofessionalartofapplyingsciencetotheoptimumconver
随机试题
[img]2012q2/ct_epej_epelist_0141_20124[/img][originaltext]F:TheplanetoShang
Whatmaybetherelationshipbetweenthespeakers?[br][originaltext]M:Goodm
InEnglish,thecolorgreenisassociatedwithjealousy,whichissometimes
自律期
国家主要通过“综合定额加专项补助法”来规定高等学校的年经费开支标准。()
以下关于入侵检测设备的叙述中,()是不正确的。A.不产生网络流量 B.使用在尽
下列费用项目中,属于建筑安装工程企业管理费的有()。A.养老保险费 B.
48岁已婚妇女,因胆道感染入院,应用抗生素10天,近一周来外阴痒明显。检查发现阴
下列关于氯喹的正确叙述是A.杀灭血中配子体 B.对疟原虫红外期有杀灭作用 C
在英国,视网膜母细胞瘤的病例占婴儿出生第一年所患癌症病例的11%,患这种疾病的儿
最新回复
(
0
)