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科学美国人60秒 SSS Future Wet Suits Otter Be Warmer

时间:2017-03-06 03:22:11

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(单词翻译)

 

Whales, seals and walruses1 stay warm in chilly2 water because they have a thick layer of blubber. We humans rely on something like blubber—neoprene rubber wet suits—to spend time in cold water. But the thick versions for really icy water are heavy and ungainly. So rather than taking after big marine3 mammals, what if we could learn from the littler ones, like beavers4 and otters5?

“These animals are quite small and they can't carry around a thick layer of blubber. So instead they have fur that is evolved to trap air, and this air provides a layer of insulation6 for them in water.”

Alice Nasto is a graduate student in mechanical engineering at MIT. Scientists have known about this air-trapping insulation mechanism7 for a long time, but they had not teased out the details of how it works. So Nasto and her colleagues took on the challenge. 

“We're creating these furry8 samples from these rubbery materials by laser cutting molds and casting these hairy surfaces. And through our approach we can precisely9 control the spacing of the hairs [and] the length of the hairs.”   

The researchers then created a system to gather data when their pelts10 entered and moved through a liquid—in this case not water, but silicone oil, which makes it easier to see air bubbles. The key is to keep the pelt’s air layer intact. 

“So when they're crossing the air water interface11, initially12 their hairy texture13 is full of air. And then you go into water. How much of the air comes down with you as you're moving in through the interface. So that's what this model will tell you.”

They found that the denser14 the hairs, the more the air gets trapped. Which should keep the animal—or potentially the human in a future furry wet suit—warm.  The research is in the journal Physical Review Fluids. [Alice Nasto et al., Air entrainment in hairy surfaces]

“What we would like to work on moving forward is understanding how, after you dive into the water, how do you maintain this air layer trapped in your fur. And there's lots of interesting properties of the fur in nature that we haven't yet looked at in our model that could help explain how this mechanism might work.”

So for now, cold-water divers15 and surfers will still emulate16 seals or sea lions. But the day may come when they’ll more closely resemble otters or beavers. Or even a Wookiee on a boogie board.

—Cynthia Graber


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1 walruses 617292179d7a1988bfff06ba7b4f606b     
n.海象( walrus的名词复数 )
参考例句:
  • Walruses have enormous appetites and hunt for food almost constantly. 海象食欲极大,几乎一直在猎取食物。 来自互联网
  • Two Atlantic walruses snuggle on an ice floe near Igloolik, Nunavut, Canada. 加拿大努勒维特伊格卢利克附近,两头大西洋海象在浮冰上相互偎依。 来自互联网
2 chilly pOfzl     
adj.凉快的,寒冷的
参考例句:
  • I feel chilly without a coat.我由于没有穿大衣而感到凉飕飕的。
  • I grew chilly when the fire went out.炉火熄灭后,寒气逼人。
3 marine 77Izo     
adj.海的;海生的;航海的;海事的;n.水兵
参考例句:
  • Marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
  • When the war broke out,he volunteered for the Marine Corps.战争爆发时,他自愿参加了海军陆战队。
4 beavers 87070e8082105b943967bbe495b7d9f7     
海狸( beaver的名词复数 ); 海狸皮毛; 棕灰色; 拼命工作的人
参考例句:
  • In 1928 some porpoises were photographed working like beavers to push ashore a waterlogged mattress. 1928年有人把这些海豚象海狸那样把一床浸泡了水的褥垫推上岸时的情景拍摄了下来。
  • Thus do the beavers, thus do the bees, thus do men. 海狸是这样做的,蜜蜂是这样做的,人也是这样做的。
5 otters c7b1b011f1aba54879393a220705a840     
n.(水)獭( otter的名词复数 );獭皮
参考例句:
  • An attempt is being made to entice otters back to the river. 人们正试图把水獭引诱回河里去。 来自《简明英汉词典》
  • Otters are believed to have been on Earth for 90 million years. 水獭被认为存活在地球上已经9千多万年。 来自互联网
6 insulation Q5Jxt     
n.隔离;绝缘;隔热
参考例句:
  • Please examine the insulation of the electric wires in my house.请检查一下我屋子里电线的绝缘情况。
  • It is always difficult to assure good insulation between the electric leads.要保证两个电触头之间有良好的绝缘总是很困难的。
7 mechanism zCWxr     
n.机械装置;机构,结构
参考例句:
  • The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
  • The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。
8 furry Rssz2D     
adj.毛皮的;似毛皮的;毛皮制的
参考例句:
  • This furry material will make a warm coat for the winter.这件毛皮料在冬天会是一件保暖的大衣。
  • Mugsy is a big furry brown dog,who wiggles when she is happy.马格斯是一只棕色大长毛狗,当她高兴得时候她会摇尾巴。
9 precisely zlWzUb     
adv.恰好,正好,精确地,细致地
参考例句:
  • It's precisely that sort of slick sales-talk that I mistrust.我不相信的正是那种油腔滑调的推销宣传。
  • The man adjusted very precisely.那个人调得很准。
10 pelts db46ab8f0467ea16960b9171214781f5     
n. 皮毛,投掷, 疾行 vt. 剥去皮毛,(连续)投掷 vi. 猛击,大步走
参考例句:
  • He did and Tibetans lit bonfires of the pelts. 他做到了,藏民们点起了篝火把皮毛都烧了。
  • Description: A warm cloak fashioned from thick fabric and wolf pelts. 一个由厚布和狼皮做成的暖和的斗篷。
11 interface e5Wx1     
n.接合部位,分界面;v.(使)互相联系
参考例句:
  • My computer has a network interface,which allows me to get to other computers.我的计算机有网络接口可以与其它计算机连在一起。
  • This program has perspicuous interface and extensive application. 该程序界面明了,适用范围广。
12 initially 273xZ     
adv.最初,开始
参考例句:
  • The ban was initially opposed by the US.这一禁令首先遭到美国的反对。
  • Feathers initially developed from insect scales.羽毛最初由昆虫的翅瓣演化而来。
13 texture kpmwQ     
n.(织物)质地;(材料)构造;结构;肌理
参考例句:
  • We could feel the smooth texture of silk.我们能感觉出丝绸的光滑质地。
  • Her skin has a fine texture.她的皮肤细腻。
14 denser denser     
adj. 不易看透的, 密集的, 浓厚的, 愚钝的
参考例句:
  • The denser population necessitates closer consolidation both for internal and external action. 住得日益稠密的居民,对内和对外都不得不更紧密地团结起来。 来自英汉非文学 - 家庭、私有制和国家的起源
  • As Tito entered the neighbourhood of San Martino, he found the throng rather denser. 蒂托走近圣马丁教堂附近一带时,发现人群相当密集。
15 divers hu9z23     
adj.不同的;种种的
参考例句:
  • He chose divers of them,who were asked to accompany him.他选择他们当中的几个人,要他们和他作伴。
  • Two divers work together while a standby diver remains on the surface.两名潜水员协同工作,同时有一名候补潜水员留在水面上。
16 emulate tpqx9     
v.努力赶上或超越,与…竞争;效仿
参考例句:
  • You must work hard to emulate your sister.你必须努力工作,赶上你姐姐。
  • You must look at the film and try to emulate his behavior.你们必须观看这部电影,并尽力模仿他的动作。

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