首页
登录
职称英语
Noses have their advantages. They’re cute, they’re versatile, and they’re sm
Noses have their advantages. They’re cute, they’re versatile, and they’re sm
游客
2024-02-16
45
管理
问题
Noses have their advantages. They’re cute, they’re versatile, and they’re small enough to be carried around. Which may be why the artificial odor detectors that engineers have been building since the 1950’s to try to mimic the olfactory(嗅觉的) abilities of our built-in sensors have taken so long to find their way to the market--and then, in most cases, have flopped(失败).
But things are finally looking up for the electronic nose. Thanks to advances in chip technology and pattern-recognition techniques, increasingly tiny sniffers (嗅探器) are beginning to live up to their moniker (模仿者)- Today e-noses are being tested for everything from disease detection to disaster prevention, and lower-prices models are starting to come to the market including an $ 8,000 device called the Cyranose 320 being introduced this week by Cyrano Sciences of Pasadena, Calif.
Like our proboscises(长鼻子), e-noses are only as good as their sensors, and all of them operate on oiliness(油质)--rather than to the molecule itself. Working together, the receptors can generate unique principles remarkably similar to those of a real nose. Humans detect odors with up to 650 types of receptors found on cells high up in the nasal passages, somewhere between our eyebrows. How the nose works is still something of a mystery, but it is believed that each receptor responds to a subtle characteristic of a molecule that carries odor--its peculiar shape, say, or degree of "smell prints" of a wide variety of odors, which are then parceled off to the brain and stored.
In e-noses, chemical sensors replace the body’s cellular receptors, and microprocessors substitute for the brain. "What limits these devices is how well the sensors are doing," explains Nathan Lewis, the Caltech chemist who helped invent the sensor technology licensed by Cyrano and who has since continued his research independently. He compares the power of e-noses to the resolution of computer monitors: "Are you seeing the world in eight shades of gray or in 16 million colors?" [br] According to the passage, more and more tiny e-noses are meeting the requirements of human noses because of ______.
选项
A、improvements in chip technology and pattern-recognition techniques
B、disease detection and disaster prevention
C、expensive prices and prompt introduction of the models
D、improvements in the olfactory abilities of our built-in sensors
答案
A
解析
细节理解题。该题问“越来越多的微小的电子鼻达到人鼻的要求”的原因是什么。根据文章第二段第二句话“Thanks to advances in chip technology and pattern-recognition techniques…”(由于晶片技术和图形识别技术方面的进步),可断定A项为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3455144.html
相关试题推荐
Noseshavetheiradvantages.They’recute,they’reversatile,andthey’resm
Noseshavetheiradvantages.They’recute,they’reversatile,andthey’resm
Noseshavetheiradvantages.They’recute,they’reversatile,andthey’resm
Noseshavetheiradvantages.They’recute,they’reversatile,andthey’resm
Noseshavetheiradvantages.They’recute,they’reversatile,andthey’resm
Obviouslytelevisionhasbothadvantagesanddisadvantages.Inthefist
随机试题
Intheeventoffailurewemustwindupourbusiness.Theunderlinedpartmeans_
Theybelievedthatthiswasnotthe______oftheircampaignforequalitybutmer
Thegovernment_________thetaxonalcohol.A、cancelB、abolishC、disposeD、eraseB
【B1】[br]【B10】[audioFiles]audio_eusm_j01_336(20099)[/audioFiles]Wealsoreceiv
发生交通事故时,下列哪种情况下当事人应当保护现场并立即报警?()A.未造成人员
学校每台计算机使用固定的IP地址上网,数学组的计算机不能上网,前去检查,检测
_________是指人民法院受理债权人提出的破产申请后三个月内,债务人的上级主
既"辛甘化阳",又"酸甘化阴"的方剂是A.四逆汤 B.吴茱萸汤 C.理中汤
清算价值法的主要方法是,假设企业破产和公司解散时,将企业拆分为可出售的几个业务或
患儿面色蜡黄,手有震颤,血红细胞3×101/L,血红蛋白80g/L,血涂片中红细
最新回复
(
0
)