Burninglesscalorieswhilewalkingseemslikeabadidea,butmak...
问题详情:
Burning less calories while walking seems like a bad idea, but making the walk easier may actually keep people on their feet longer, and that scientists say, has substantial health benefits.
Analyzing the human walk, biomedical engineers Steven Collins and Greg Sawicki concluded that our ankles and calves perform motions similar to a spring coupled with a clutch that intermittently stores and releases energy.
Sawicki, from the University of North Carolina, explained what’s involved.
“We found in basic science experiments that that system, your calf and Achilles tendon, works a lot like a catapult. So, the muscle holds on to the tendon and your body actually stretches your Achilles tendon quite a bit and then stores the energy in the tissue and then it’s given back to propel you forward in the world,” he said.
Sawicki said he and his colleague Steven Collins at Carnegie Mellon University designed a mechanical device, made of carbon fiber and metal, that performs the same sequence of energy give-and-take outside the body. The system takes over part of the work of walking, and reduces the amount of required energy by as much as seven percent.
Wearing the unpowered ankle exoskeleton can help people either walk farther with the same amount of energy, or restore the normal movement pattern for people who have trouble walking.
Sawicki said it takes only a few minutes to get used to the exoskeleton but the wearer quickly learns to tone down the muscle energy as the device takes over part of the load.
“You really don’t notice it until when you take it off. And when you take it off you realize that it was there and giving you the boost,” he said.
Sawicki added that the device is primarily intended for people recovering from surgery or a stroke. But all persons who spend a lot of time walking, such as police officers or hospital personnel, could benefit from it.
At the moment there are no plans to develop the ankle exoskeleton for the market, but the inventors say some manufacturers have expressed interest.
25.What’s the main idea of the passage?
A. How to reduce energy whiling walking.
B. Ways to make walking easy.
C. Introduction to a mechanical device to make walk easier
D. Guidelines for people recovering from surgery.
26.What is true according to the passage ?
device can only benefit people with walking problems.
B. All people could benefit from it.
C. With the device, the walkers need seven percent as much as the energy otherwise.
D. The device can benefit people in the long term.
27.What does the underlined word ” propel” mean in paragraph 3?
A. put B. keep D. push
28.What can we learn from the last paragraph?
A. The ankle exoskeleton will have a bright future.
B. The ankle exoskeleton hasn’t appeal to manufacturers.
C. The ankle exoskeleton will be launched in the market soon.
D. The ankle exoskeleton will never be produced.
【回答】
CDDA
知识点:科普环保类阅读
题型:阅读理解
-
下列对诗句分析不正确的一项是( )A.“关关雎鸠,在河之洲”两句运用比喻手法,说明淑女、君子在河滩幽会,营造...
问题详情:下列对诗句分析不正确的一项是()A.“关关雎鸠,在河之洲”两句运用比喻手法,说明淑女、君子在河滩幽会,营造出一种幽静的氛围。B.“参差荇菜”一句反复使用,增强了诗歌的节奏感,也展现了《诗经》回环往复、一唱三叹的特*。C.“悠哉悠哉,辗转反侧”以行动来反映君...
-
早春二月的某一天,A市的平均气温为-5℃,B市的平均气温为3℃,则当天B比A市的平均气温高
问题详情:早春二月的某一天,A市的平均气温为-5℃,B市的平均气温为3℃,则当天B比A市的平均气温高____________℃.【回答】8提示:3-(-5)=8.知识点:有理数的加减法题型:填空题...
-
读下图,回答3—4题3.水循环中A.①环节是水汽输送,中纬西风是其主要动力B.②环节是降水,主要集中在春、秋季...
问题详情:读下图,回答3—4题3.水循环中A.①环节是水汽输送,中纬西风是其主要动力B.②环节是降水,主要集中在春、秋季节C.③环节是地表径流,径流量季节和年际变化大D.④环节蒸发的水汽,大部分被输送到陆地上空4.关于图中*、乙、*、丁四处的叙述,正确的是A.*处为向斜山,主要由...
-
可吸入颗粒物(指空气动力学直径小于10微米的颗粒物,表示为PM10。PM2.5是指大气中直径小于或等于2.5微...
问题详情:可吸入颗粒物(指空气动力学直径小于10微米的颗粒物,表示为PM10。PM2.5是指大气中直径小于或等于2.5微米的颗粒物,也称为可入肺颗粒物)是*市大气的一种主要污染物,它们虽然在大气中的含量很少,但是它对环境和人体的危害都很大。回答3-4题。3.读*市2003年1月16...
相关文章
- Nickname:Hawaii’sIslandofAdventureSize:4,028squaremiles...
- I'mLisa.Iloveweekends!Onweekends,Ialwaysgetuplate.Sofor...
- —Mike,ourteamwillplayagainsttheRocketsthisweekend.I'msu...
- TIMEisanAmericanweeklynewsmagazinepublishedinNewYorkCit...
- JackBainesisaself-mademillionaire,buthisbeginningswerev...
- 完形填空。Janeisanicegirlandlikessmallanimals.Onherwaybackfr...
- Electricitymakeswonderfulthingspossible.Itkeepsuswarmin...
- 词汇应用Makingfriendsisaskill.Likemostskills,youcanimprovei...
- 连词成句1.like,you,vegetables,Do2.likes,LiuWei,much,chicken...
- Sinceourtwinsbeganlearningtowalk,mywifeandIhavekepttell...