Photo: Fuel in the tank—in the trunk of Ford's hydrogen fuel cell car. Photo courtesy of NASA Kennedy Space Center. How does a fuel cell make electricity from hydrogen? What happens in a fuel cell is called an electrochemical reaction. It's a chemical reaction, because it involves two ...
aIn the 'VM working folder', unzip one PSP. After this you may delete the zip files. For performance reasons we recommend to copy and unzip all other PSPs after the installation. 在 ' 操纵文件夹的 VM ',解压缩一个 PSP。在这之后你可能删除 zip 文件。基于表现原因我们推荐在安装之后复制和解...
Photo by Pat Corkery courtesy of US Department of Energy/National Renewable Energy Laboratory (DOE/NREL). How does it work? The basic working principle involves lithium ions (positively charged lithium atoms—with missing electrons) that migrate back and forth between the two electrodes through the...
Light separates electric charges in a solar cell material by displacing negatively charged electrons. This also creates electron deficiencies, called “electron holes,” with a positive charge. Electrons and holes migrate to opposite sides of the material, generating a voltage for electr...
"On the experimental side, we think that reproducing in a laboratory the Mpemba effect in a granular gas would be a breakthrough. We are currently working on the design of an ad hoc experiment." More information:Antonio Lasanta et al. "When the Hotter Cools More Quickly: Mpemba Effect in...
Tickets for the 2021 Montessori Homeschool Summit that a bunch of us Montessori educators have been working on hard behind the scenes for months now — are about to drop. The topics are geared toward homeschoolers to help make life simpler while navigating Montessori. Whether you need practical...
(Pulse charging can also be useful for reviving older, degraded batteries, such as lead-acid or nickel-cadmium, in which crystals have grown and impeded the batteries' ability to keep on working; the pulses of electricity break the crystals down so the battery works normally again.)...
It makes sense to ship high-voltage electricity from the power station and then transform it to lower voltages when it reaches its various destinations. (Even so, centralized power stations are still very inefficient. About two thirds of the energy that arrives at a power plant, in the form ...
If you're using software as a service (for example, writing a report using an online word processor or sending emails through webmail), you need a reliable, high-speed,broadbandInternet connection functioning the whole time you're working. That's something we take for granted in countries such...
Wrinkles, creases and folds are everywhere in nature, from the surface of human skin to the buckled crust of the Earth. They can also be useful structures for engineers. Wrinkles in thin films, for example, can help make durable circuit boards for flexib