铅笔与办公纸可用作变形测量仪-凯发k8官网

铅笔与办公纸可用作变形测量仪
文章来源:未知 文章作者:enread 发布时间:2014-01-24 06:55 字体: [ ] 
(单词翻译:双击或拖选)
sometimes solving a problem doesn't require a 1 solution. sometimes, you have to look no farther than your 2. three students from northwestern university's mccormick school of engineering -- an undergraduate, a master's student, and their teaching assistant -- have proven that pencils and regular office paper can be used to create 3 devices that can measure strain and detect 4 chemical 5.
 
a paper describing their findings, "pencil 6 strain 7 and chemiresistors on paper," was published january 22 in scientific reports, an open-access journal from the nature publishing group.
 
the project originated in fall 2011 in mccormick's introduction to conducting polymers course (mse 337) during a discussion about the conductive properties of graphene(石墨烯), a one-atom thick layer of carbon that can be 8(解析,理解) from regular pencil lead. (a 9, pencil "lead" actually comprises graphite in a clay 10.)
 
"when you draw a line on a piece of paper, the graphite may shed numerous graphene sheets," said jiaxing huang, associate professor of materials science and engineering. "a student asked, 'can we use that graphene for something?' that started an exploration of what pencil traces can do."
 
one team of students -- including lead authors cheng-wei lin (ms materials science '13) and zhibo zhao (bs materials science '13) -- started by measuring the conductivity of a pencil trace on paper, then used the traces to create a rudimentary(基本的) electrode. they learned that curling the paper in one direction increased the trace's conductivity by compressing the conductive graphene particles. curling the paper in the other direction loosened the graphene network and decreased conductivity.
 
the students then turned to the traces of a bendable toy pencil. (these novelty pencils are flexible because the graphite is mixed not with clay, but with a polymer binder.) again, conductivity could be increased and decreased by manipulating the paper, but the students found it also was 11 by the presence of 12 chemical vapors, such as those from 13 industrial 14.
 
when the chemical is present, the polymer binder absorbs the vapors and expands, pushing the graphene network apart and decreasing conductivity. the conductivity decreased the most in the presence of vapors that are more readily absorbed by the polymer binder.
 
these types of chemical 15 -- also called "chemiresistors" -- are key elements in "electronic noses" for detecting toxic chemical vapors. in creating chemiresistors, researchers often use more expensive materials, such as networks of carbon nanotubes or metal nanoparticles, and need to 16(分散) them in polymer matrix to form a network.
 
"now our students showed that this can be done simply with a pencil and paper -- and it works," huang said. "this is a great example showing how curiosity leads to 17 work."
 
other applications of the pencil-and-paper technology could be more unconventional. "it could help to inspire some new form of art," huang said. "perhaps one can make 'smart' and 18 drawings, in which the art itself is the circuitry and can respond to the environment."


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1 high-tech     
adj.高科技的
参考例句:
  • the economy is in the upswing which makes high-tech services in more demand too.经济在蓬勃发展,这就使对高科技服务的需求量也在加大。
  • the quest of a cure for disease with high-tech has never ceased. 人们希望运用高科技治疗疾病的追求从未停止过。
2 sucznx     
n.桌面管理系统程序;台式
参考例句:
  • my computer is a desktop computer of excellent quality.我的计算机是品质卓越的台式计算机。
  • do you know which one is better,a laptop or a desktop?你知道哪一种更好,笔记本还是台式机?
3 5hmxa     
adj.为实用而设计的,具备功能的,起作用的
参考例句:
  • the telephone was out of order,but is functional now.电话刚才坏了,但现在可以用了。
  • the furniture is not fancy,just functional.这些家具不是摆着好看的,只是为了实用。
4 iddxz     
adj.(有)危险的,冒险的;碰运气的
参考例句:
  • these conditions are very hazardous for shipping.这些情况对航海非常不利。
  • everybody said that it was a hazardous investment.大家都说那是一次危险的投资。
5 94a2c1cb72b6aa4cb43b8fb8f61653d4     
n.水汽,水蒸气,无实质之物( vapor的名词复数 );自夸者;幻想 [药]吸入剂 [古]忧郁(症)v.自夸,(使)蒸发( vapor的第三人称单数 )
参考例句:
  • his emotions became vague and shifted about like vapors. 他的心情则如同一团雾气,变幻无常,捉摸不定。 来自辞典例句
  • they have hysterics, they weep, they have the vapors. 他们歇斯底里,他们哭泣,他们精神忧郁。 来自辞典例句
6 muxzii     
v.拖,拉,拔出;adj.憔悴的,紧张的
参考例句:
  • all the characters in the story are drawn from life.故事中的所有人物都取材于生活。
  • her gaze was drawn irresistibly to the scene outside.她的目光禁不住被外面的风景所吸引。
7 29872e70c0d2a7366fc47f04800f1362     
n.规格( gauge的名词复数 );厚度;宽度;标准尺寸v.(用仪器)测量( gauge的第三人称单数 );估计;计量;划分
参考例句:
  • a thermometer gauges the temperature. 温度计可测量温度。 来自《简明英汉词典》
  • the fuel gauges dropped swiftly. 燃料表指针迅速下降。 来自《简明英汉词典》
8 c3732cbf21875cb12763787c984dd68d     
v.从语法上描述或分析(词句等)( parse的过去式和过去分词 )
参考例句:
  • you should never assume any of the scripts being parsed are valid. 你绝不能假设所有的脚本都正确的解释。 来自互联网
  • all text in an xml document will be parsed by the parser. xml文档中的所有文本都会被解析器解析。 来自互联网
9 ndtxr     
n.误称
参考例句:
  • herbal"tea"is something of a misnomer because these drinks contain no tea at all.花草“茶”是一个误称,因为这类饮料里面根本不含茶。
  • actually," underground "is a misnomer,because more than half the shops are above ground.实际上,“ 地下 ” 这个名称用之不当,因为半数以上的店铺是在地面上的。
10 atuzh     
n.包扎物,包扎工具;[法]临时契约;粘合剂;装订工
参考例句:
  • the cloth flower snaps on with a special binder.这布花是用一种特殊的粘合剂固定住的。
  • purified water was used as liquid binder.纯净水作为液体粘合剂。
11 tzuzg0     
adj.不自然的,假装的
参考例句:
  • she showed an affected interest in our subject.她假装对我们的课题感到兴趣。
  • his manners are affected.他的态度不自然。
12 tlqzq     
adj.反复无常的,挥发性的,稍纵即逝的,脾气火爆的;n.挥发性物质
参考例句:
  • with the markets being so volatile,investments are at great risk.由于市场那么变化不定,投资冒着很大的风险。
  • his character was weak and volatile.他这个人意志薄弱,喜怒无常。
13 inswc     
adj.有毒的,因中毒引起的
参考例句:
  • the factory had accidentally released a quantity of toxic waste into the sea.这家工厂意外泄漏大量有毒废物到海中。
  • there is a risk that toxic chemicals might be blasted into the atmosphere.爆炸后有毒化学物质可能会进入大气层。
14 034b168fe60271d2a244d289076119b4     
溶解的,溶剂
参考例句:
  • it is resistant to borohydride reduction in alcoholic solvents. 在醇溶剂中,它不能被硼氢化物还原。
  • strains require special treatments for removal such as spotting with organic solvents. 要清除这些着色物质,需要特殊处理,例如:滴加有机溶剂。
15 sz7we     
n.传感器,探测设备,感觉器(官)
参考例句:
  • the temperature sensor is enclosed in a protective well.温度传感器密封在保护套管中。
  • he plugged the sensor into a outlet.他把传感器插进电源插座。
16 ulxzl     
vi.使分散;使消失;vt.分散;驱散
参考例句:
  • the cattle were swinging their tails to disperse the flies.那些牛甩动着尾巴驱赶苍蝇。
  • the children disperse for the holidays.孩子们放假了。
17 d6vxq     
adj.革新的,新颖的,富有革新精神的
参考例句:
  • discover an innovative way of marketing.发现一个创新的营销方式。
  • he was one of the most creative and innovative engineers of his generation.他是他那代人当中最富创造性与革新精神的工程师之一。
18 kqzzfy     
adj.相互作用的,互相影响的,(电脑)交互的
参考例句:
  • the psychotherapy is carried out in small interactive groups.这种心理治疗是在互动的小组之间进行的。
  • this will make videogames more interactive than ever.这将使电子游戏的互动性更胜以往。
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