Piezoelectric devices promise to draw power from your footsteps or heartbeat, change the channel on your TV, and complete all sorts of helpful tasks — but they generally work in the nano-mechanical realm, requiring synthetic materials to function.
For the first time, scientists have been able to watch electrons move in an atom's outer shell, in a breakthrough with major implications for our understanding of chemical processes.
Using ultra-short flashes of laser light, scientists from the Max Planck Institute of Quantum Optics in Germany and Lawrence Berkeley National Laboratory in Berkeley, Calif., were able to time oscillations between valence electrons' quantum states.
By Dawn StoverPosted 11.01.2007 at 10:13 am 0 Comments
It's the world's smallest radio. Made from a single carbon nanotube, "the real nanopod" is 10,000 times thinner than a human hair but can receive and play tunes broadcast by AM and FM radio stations.
The first song played on the nanotube radio was Eric Clapton's Layla. The technology isn't perfect yet (you'll hear some static), but the song is clearly recognizable.
In the image at left, taken by a transmission electron microscope, a slender nanotube protrudes from an electrode that provides power for the tiny radio (the radio waves were added to the image for effect). When the frequency of the incoming radio waves matches the resonant frequency of the nanotube, it vibrates. The nanotube's tip, which is electrically charged, detects the mechanical vibrations and translates them into sound signals.
Researchers at the U.S. Department of Energys Lawrence Berkeley National Laboratory and the University of California at Berkeley who teamed up to invent the radio say that its extremely small size opens the door to some exciting applications. For example, they envision radios that could be implanted in the inner ear as hearing aids or as discrete devices for receiving information.—Dawn Stover
Image: Courtesy Zettl Research Group, Lawrence Berkeley National Laboratory and the University of
California at Berkeley
We must intervene to halt these aging processes, says Aubrey De Grey. the rub is, no one has figured out how
By Joseph HooperPosted 01.01.2005 at 2:00 pm 0 Comments
1. Cell Loss Our liver, kidneys and other organs keep a fair number of cells in reserve; still, over time, cell loss may impair their functioning. De Grey’s fix: Engineer embryonic stem cells to create healthy new versions of every type of body cell. Introduce the stem cells into the body to rejuvenate diseased or flagging tissues. The mechanism to deliver the various cell types to all the right places has yet to be developed.