The days of having to carry a phone charger everywhere could soon be over. Michigan researchers have revealed a major breakthrough in harvesting energy from human motion. They say it could lead to smartphones powered for a week by the motion of a swipe(重击).
Michigan State University’s low-cost device, known as a nanogenerator, has already been tested. Scientists successfully operated an LCD touch screen, a bank of 20 LED lights and a flexible keyboard, all with a simple touching or pressing motion and without the aid of a battery. The groundbreaking findings, published in the journal Nano Energy, suggest “We’re on the path toward wearable devices powered by human motion,” said Nelson Sepulveda, associate professor of electrical and computer engineering and lead researcher of the project.
“What I foresee, relatively soon, is the capability of not having to charge your cell phone for an entire week, for example, because that energy will be produced by your movement,” said Sepulveda, whose research is funded by the National Science Foundation.
Electrical energy is created when the device is compressed by human motion. The completed device is as thin as a sheet of paper. The device used to power the LED lights was palm-sized, while the device used to power the touch screen was as small as a finger. Advantages such as being lightweight, flexible and low-cost could make it a promising and alternative method in the field of Mechanical-energy harvesting.
The device also becomes more powerful when folded. Sepulveda said, “You can start with a large device, but when you fold it once, and again, and again, it’s much smaller and has more energy. Now it may be small enough to put in a specially made heel of your shoe so it creates power each time your heel strikes the ground.”
Sepulveda and his team are also developing technology that would transmit the power generated by the heel strike to, say, a wireless headset.
1.Who is Nelson Sepulveda?
A. The major researcher in the project. B. A professor of engineering.
C. The fund supplier of the research. D. A journalist writing for Nano Energy.
2.The underlined word device in the 2nd paragraph is closest in meaning to ________.
A. keyboard B. smartphone C. screen D. machine
3.From the passage we know that the nanogenerator ________.
A. becomes more powerful when kept flat
B. has already come into market in the USA
C. is lightweight and flexible though expensive
D. makes it possible to produce power by walking
4.The purpose of the passage is to ________.
A. persuade people to buy the device B. bring in a new way to save energy
C. introduce a breakthrough in science D. honor Nelson Sepulveda for his contributions
高三英语阅读理解困难题
The days of having to carry a phone charger everywhere could soon be over. Michigan researchers have revealed a major breakthrough in harvesting energy from human motion. They say it could lead to smartphones powered for a week by the motion of a swipe(重击).
Michigan State University’s low-cost device, known as a nanogenerator, has already been tested. Scientists successfully operated an LCD touch screen, a bank of 20 LED lights and a flexible keyboard, all with a simple touching or pressing motion and without the aid of a battery. The groundbreaking findings, published in the journal Nano Energy, suggest “We’re on the path toward wearable devices powered by human motion,” said Nelson Sepulveda, associate professor of electrical and computer engineering and lead researcher of the project.
“What I foresee, relatively soon, is the capability of not having to charge your cell phone for an entire week, for example, because that energy will be produced by your movement,” said Sepulveda, whose research is funded by the National Science Foundation.
Electrical energy is created when the device is compressed by human motion. The completed device is as thin as a sheet of paper. The device used to power the LED lights was palm-sized, while the device used to power the touch screen was as small as a finger. Advantages such as being lightweight, flexible and low-cost could make it a promising and alternative method in the field of Mechanical-energy harvesting.
The device also becomes more powerful when folded. Sepulveda said, “You can start with a large device, but when you fold it once, and again, and again, it’s much smaller and has more energy. Now it may be small enough to put in a specially made heel of your shoe so it creates power each time your heel strikes the ground.”
Sepulveda and his team are also developing technology that would transmit the power generated by the heel strike to, say, a wireless headset.
1.Who is Nelson Sepulveda?
A. The major researcher in the project. B. A professor of engineering.
C. The fund supplier of the research. D. A journalist writing for Nano Energy.
2.The underlined word device in the 2nd paragraph is closest in meaning to ________.
A. keyboard B. smartphone C. screen D. machine
3.From the passage we know that the nanogenerator ________.
A. becomes more powerful when kept flat
B. has already come into market in the USA
C. is lightweight and flexible though expensive
D. makes it possible to produce power by walking
4.The purpose of the passage is to ________.
A. persuade people to buy the device B. bring in a new way to save energy
C. introduce a breakthrough in science D. honor Nelson Sepulveda for his contributions
高三英语阅读理解困难题查看答案及解析
Phone batteries rarely last a full day anymore, so carrying compact chargers (小巧的充电器) is becoming normal. But many of these so-called portable devices are heavy, thick and inconvenient—until Solar Paper is developed.
Chicago engineers have designed a super-thin, lightweight panel (面板) called Solar Paper capable of charging an iPhone in two hours and many panels can be combined to boost its power. It was created by Chicago-based Yolk. After raising more than $1million online for the production, it is now available to purchase throughout the country. It comes in four versions—2.5W, 5W, 7.5W and 10w—depending on the output needed for various devices. And these different models are created by combining individual 2. 5W panels together.
A 2.5W panel will charge an iPhone 6 or Galaxy S3 in five hours. The 5W version charges the same devices but cuts changing time to two hours or three hours if it’s cloudy. The 7.5W model Solar Paper changes the devices in the same time as the 5W version but produces more energy when it is cloudy. The 10W version is ideal(理想的) for the iPad Air 2, and will charge a device in 2.5 hours. Each individual panel measures 3.5 inches× 6.7 inches×0.6inches, weighs 60g and 1.5mm thick.
Other features include a unique automatic reset (重置) function which stops and starts the Paper charging when cast with a shadow or placed in sunlight. Other solar chargers require you to re-plug the wire at these conditions. It also has a low-energy LCD screen that displays the amount of power the Solar Paper produces in real time.
1.What does the underlined word “boost” in the second paragraph mean?
A. Balance.
B. Increase
C. Possess.
D. Reduce.
2.How is Solar Paper different from other solar chargers?
A. It can be carried wherever you go.
B. It can produce more electricity.
C. It can produce power even if it’s rainy.
D. It can get reconnected automatically after a shadow.
3.What is the author’s purpose in writing the text?s
A. To introduce the strengths of solar chargers.
B. To praise Chicago engineers for their efforts.
C. To introduce a new type of solar charger.
D. To advise producers to make phone batteries last long.
4.What can we know about the Solar Paper?
A. Yolk started an online activity to fund production of Solar Paper.
B. Customers are able to buy Solar Paper all over the world.
C. The 7. 5W version is the best choice if users charge an iPad.
D. The LCD screen shows how much current an iPhone uses.
高三英语阅读理解中等难度题查看答案及解析
Cafes are everywhere these days，offering as many varieties of coffee as there are ways to have it served．And this leads to a range of prices，from cheap grab—and—go coffee，to the ultra—expensive artisanal coffee(匠人咖啡)．However，an increasing number of Western consumers are happy to pay a little more for their cup in order to ensure that it comes from an ethically(道德地)produced and sustainable source．
At The Attendant，a cafe in east London，staff attempt to make customers aware of the story of the beans that they are drinking and the impact they are having by choosing to drink ethically．For a start，it can make coffee farmers better off，according to figures from the UN’s World Intellectual Property Organization(Wipo)．Ryan de Oliveria，The Attendant’s co-founder and chief executive，says the extra income allows farmers and their families to have a better quality of life．It also makes investing or reinvesting in their business possible．
Wipo’s figures show smarter processing，branding and marketing make a huge difference to the growers and their communities．Technology now means that the beans can be tracked all the way from the farm to the cup．The research shows that for a pound(454g)of beans going to a supermarket，the export price is$1．45．Most of this goes to the farmer．The price almost doubles when the beans are he aded for large western coffee chains．But farmers exporting their beans to artisanal cafes make over $5 per pound．That’s because the coffee addicts who frequent these places are happy to pay more．
It seems that it’s a win—win situation for the farmers，cafes and consumers．So much so that more established coffee businesses are jumping on the band wagon by buying up(并购)artisanal rivals who have already accepted this way of doing things．If that’s the case，then the future of coffee production looks a little fairer for all．
1.What does paragraph 1 focus on?
A. The varieties of coffee．
B. The range of coffee prices．
C. The popularity of artisanal coffee．
D. The reason for customers to pay more for coffee．
2.Where can you find the data that best support“growing artisanal coffee is beneficial”?
A. In paragraph 1． B. In paragraph 2．
C. In paragraph 3． D. In paragraph 4．
3.What do the words“jumping on the band wagon”in the last paragraph probably mean?
A. Making a large profit． B. Following the general trend．
C. Gaining a good reputation． D. Avoiding the fierce competition．
4.What’s the author’s purpose in writing the text?
A. To advocate ethical coffee． B. To advertise coffee business．
C. To help customers to save money． D. To introduce the art of processing coffee．
高三英语阅读理解困难题查看答案及解析
—I felt it very difficult to carry on the work all by myself.
—I could have helped you, but you _____me to.
A. hadn’t asked B. didn’t ask C. haven’t asked D. don’t ask
高三英语单项填空中等难度题查看答案及解析
The old house of this area had to be ______ immediately so that the government could carry its flower-style-city programmer out.
| A．torn up | B．torn down | C．torn away | D．torn out |
高三英语单项填空中等难度题查看答案及解析
In those days, we had no phones, so we have to keep in touch _____ writing often.
| A．with | B．of |
| C．on | D．by |
高三英语单项填空简单题查看答案及解析
18.The newcomer went to the library the other day in search of ____________he could find about
Mark Twin.
A.wherever B.whatever C.whoever D.however
高三英语单项填空中等难度题查看答案及解析
One student took a box of chicken to class. Another carried on a cell-phone_______, and still another whistled loudly every time the_______turned his back. Reform school? No. College.
More and more, professors say, they are _______ across rude students in their classrooms. Many of today’s young scholars arrive late, leave_______, talk loud or take care of personal _______ such as paying bills during class.
Why are the students behaving badly? “Because they can,” said a student of University of North Texas. “A lot of the time, the professors _______them get away with it.”
Some educators say it is time to bring politeness back to their classrooms — and even_______taking some of the blame for bad behavior. They say that_______ students are by no means the majority but that one of them can ruin an entire_______.
People are ________when they learn that impolite behavior is becoming more and more common in ________education, says Dr. Gerald Amanda, a counselor at City College of San Francisco. They ________ some high school students to misbehave but think those who get to ________ will behave more politely.
Dr. Amanda believes that society in ________ has become more tolerant of rude behavior ________ that people in power, including professors, no longer ________ standards for politeness. That leads to a growing imprudence among some college________. “There’s a great ________ of bad behavior in the world around them, and young people see it and ________ disrespect,” said Dr. Amanda, ________ that sometimes students have no idea that they are being rude.
1.A.look B.news C.picture D.conversation
2.A.professor B.chick C.monitor D.classmate
3.A.getting B.coming C.cheating D.moving
4.A.alone B.early C.happily D.quietly
5.A.appearance B.interest C.computer D.affairs
6.A.let B.ask C.persuade D.lead
7.A.risk B.mind C.avoid D.start
8.A.rude B.poor C.beautiful D.good
9.A.lesson B.classmate C.subject D.class
10.A.moved B.inspired C.surprised D.encouraged
11.A.lower B.junior C.higher D.younger
12.A.expect B.want C.forbid D.warn
13.A.profession B.school C.knowledge D.college
14.A.motion B.time C.charge D.general
15.A.but B.so C.or D.and
16.A.set B.change C.break D.reach
17.A.teachers B.professors C.leaders D.students
18.A.deal B.number C.kind D.sum
19.A.prepare B.respect C.develop D.escape
20.A.speaking B.warning C.adding D.wishing
高三英语完形填空简单题查看答案及解析
Excuse me, Marcia, a reporter from Vanity Fair ________ all day. Could you speak to her now?
A. phones B. has phoned C. has been phoning D. phoned
高三英语单项填空中等难度题查看答案及解析
Excuse me, Marcia, a reporter from Vanity Fair ________ all day. Could you speak to her now?
A. phones B. has phoned
C. has been phoning D. phoned
高三英语单项填空困难题查看答案及解析