题型：阅读理解 题类：常考题 难易度：普通
湖南省衡阳市第一中学2020届高三上学期英语11月月考试卷
It seems that electronic devices just keep getting smaller. Scientists in the United States have announced the creation of the first transistor with only two dimensions(二维).
A transistor is a small electronic device that transfers or carries electronic current. Scientists hope these new 2D transistors will be used for building high-resolution(高分辨率)displays that need very little energy.
Two groups of scientists created these 2D transistors. They report that the transistors are only a few atoms thick.
Usually transistors are made with the element silicon(硅). Computer processors, memory chips, TV screens and other electronic devices contain billions of silicon-based transistors. But these very small electrical parts have certain limitations.
Dimitris Ioannou is an electrical engineering professor at George Mason University. He says the traditional transistor has been improved as much as it can be. He adds that researchers have been looking for new materials with special features and they want transistors to be seen through and soft.
"If the layers are very thin, the transistor can become flexible, so it doesn't have to be rigid(坚硬的), like it would be in a silicon chip. So people can think of applications like wearable electronics, television screens and other things," said Ioannou.
These new transistors can also carry higher current. They also can move the current much faster than traditional transistors. This is important for high-definition screens.
Dimitris Ioannou says the scientific success could prove very useful in the future. "Now, how good and how useful it will be, it's still in the stage of research, but it certainly is an advance," said Ioannou.
Family Fun in Canadian Museum of Nature
Bring the whole family to rediscover our fully redecorated museum.
WHAT TO SEE AND DO
Check out What's On for all the events, educational activities and HD movies happening during your visit. Care for birds, dive down into the depths at the helm (舵柄) of a research submersible(潜水器) or explore a cave… on the first floor. Don't miss our gallery play areas on the third floor when visiting with kids. By visiting here, your children will learn more about nature. Check out Our Exhibitions which present our special exhibitions and our galleries. Be sure to stop at our Nature Boutique on the second floor for a vast selection of games, books and nature-related souvenirs from 9:30 am until the museum closes for the day.
HOURS, ADMISSION, SERVICES AND MORE
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Opening hours: Regular Hours (September 4 -May 31) 9 am-5pm except Monday and Thursday Summer Hours (June 1-September 2) 9 am-6 pm(Saturday-Wednesday) 9 am-8 pm(Thursday and Friday) |
General Admission: Free for members. Adult: $14.50 Senior (65+): $12.50 Student (18+): $12.50 Student (13+): $12.50 Child (3–12): $10.50 Tiny Tot (0–2): Free A general admission ticket is required—even when the price is free, as it is for members and Tiny Tots—if you want to see a movie or a special exhibition. Buy a combo that includes both tickets already. Ticket combo includes general admission and a 3D movie. Adult: $18.50 Senior (65+): $16.50 Student (18+): $16.50 Student (13+): $16.50 Child (3–12): $14.50 Tiny Tot (0–2): Free Member: $3 |
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Parking: Paid parking is available on the Canadian Museum of Nature grounds. Rates: $3 per half hour maximum of $14 per day (until 4:30 am) evening flat rate: $5 (4:30 pm -4:30 am) Charges accumulate (evening and next day) for vehicles that are parked overnight. |
The Canadian Museum of Nature provides a host of information, images and videos on our websites about nature, such as http://www.nature.ca/en/family-fun and http://www.expeditionarctic.ca/.The museum also participates in several social networks. Follow us on Facebook, YouTube, Instagram and Twitter.
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