题型:阅读理解 题类: 难易度:普通
人教版(2019)选择性必修第三册UNIT 5课时评价作业十九
A rainy day can be a chance to recharge. While you relax on the sofa with a movie, the raindrops falling on your windows might one day provide the power for your TV. This is the idea behind an invention that harvests energy from water.
The technology is based on the triboelectric (摩擦电的) effect. An engineer at the University of Hawaii, David Ma knew that it was possible to generate electricity by rubbing two things together. So, he thought, "Why don't we use water?"
A drop of water sliding across a surface coated with two different materials would generate enough friction(摩擦) to create an electrical charge. By placing metal wires that the drop of water touched as it moved, it should be possible to harvest electricity, he reasoned.
It worked. In fact, the researchers lit up 15 LED bulbs with a single moving water drop.
This is not the first time that scientists have got electricity from water-generated friction. Earlier experiments, though, harvested the charge produced in a surface by a sliding drop of water. There, the surface had acted as an electrode(电极). This is different. The energy of friction is being harvested from the water itself.
"The technology could someday power phones, sensors or other small electronics," says Christopher Oshman, an engineer at the Colorado School of Mines. "This work is a step towards harvesting the energy of moving objects all around us, including ourselves, to power the electronic devices we use every day," he says.
"Ma has shown that the technology can work in a lab," Oshman says. Next, the Colorado researcher would like to see it tried on a larger scale, such as on an umbrella.
Bulletin Board Workshops are held at Women's Health Centre, 1441 29 St. N.W. If you are interested, please call 944-2260 or visit www.womenhealthcentre.ca. | |
Eating to Get to Your Healthiest Weight | If you are seeking professional help with your weight-loss efforts, then this workshop series, presented by Dawn Peacock, BSc, RD, is for you. The workshop will take place on Fridays, July 10 between 1:30 p.m. and 3:30 p.m. or July 24 between 7 p.m. and 9 p.m. Fee: $120 |
How to Reduce Depression & Anxiety | Depression and anxiety are two disorders that often affect women at the same time. They may go unrecognized and cause needless suffering. This four-part class, offered by Elizabeth Miles, MSc, Rpsych, will help reduce the suffering. The classes will be held on Wednesdays, July 8, between 1:30 p.m. and 3:30 p.m. or July 22 between 7 p.m. and 9 p.m. Fee: $120. |
How Do I Protect My Bones? | Osteoporosis (骨质疏松) is a serious health condition that affects women as they age. Come to this workshop, presented by Irene Jackson, RN, MN, to find out more about osteoporosis and learn how you can reduce your risk factors and protect your bones. The workshop will take place on Tuesday, Aug. 16, 8 a.m. to 8 p.m. Fee: $150. |
Raising Your Child in a Weight Obsessed World | We live in a world where television and restaurants are pushing super-sized hamburgers and soft drinks, while magazines feature pencil-thin models. This presentation, by Keri Sullivan, MSc, RD, Eating Disorder Program, will offer ways to build healthy environments and behaviours for children. The presentation will be offered on Wednesday, Aug. 24, 8 a.m. to 8 p.m. Fee: $150. |
试题篮