17-02-2008   -   Energy

Sun, 17 Feb 2008 New World Record For Solar-to-grid Conversion Efficiency Set. Scientists have set a new solar-to-grid system conversion efficiency record by achieving a 31.25 percent net efficiency rate. The old 1984 record of 29.4 percent was toppled Jan. 31 on SES"s "Serial #3" solar dish Stirling system at Sandia"s National Solar Thermal Test Facility. The solar dish generates electricity by focusing the sun’s rays onto a receiver, which transmits the heat energy to a Stirling engine. The engine is a sealed system filled with hydrogen. As the gas heats and cools, its pressure rises and falls. The change in pressure drives the pistons inside the engine, producing mechanical power, which in turn drives a generator and makes electricity. more

  14-02-2008   -   Nono Tech

Thu, 14 Feb 2008 Tweaking The Conductivity Of Nanotube Composites. One of the immediate applications of carbon nanotubes (CNT) is as an additive to polymers to create electrically conducting plastics--a relatively low CNT concentration can dramatically change the polymer"s electrical conductivity by orders of magnitude, from an insulator to a conductor. New measurements have uncovered an intriguing wrinkle. For a given CNT concentration, the electrical properties of the composite can be tuned from being a conductor to a non-conductor simply by changing processing conditions -- basically how fast the polymer flows. more

  12-02-2008   -   Geology

Tue, 12 Feb 2008 Just after midnight, a magnitude 4 earthquake hits southern Lebanon, The seismic activity was centered near the city of Tyre, some 7 km bellow surface and was felt in Southern Syria. more

  10-02-2008   -   Energy

Sun, 10 Feb 2008 Organic Solar Cells: Electricity From A Thin Film ! Teams of researchers all over the world are working on the development of organic solar cells. Organic solar cells have good prospects for the future: They can be laid onto thin films, which makes them cheap to produce.more

  29-01-2008   -   Nano Tech

Tue, 29 Jan 2008 Could A Nanotube-based Drug Prevent Radiation Injury? A new study aims to determine whether a new drug based on carbon nanotubes can help prevent people from dying of acute radiation injury following radiation exposure. The study was commissioned after preliminary tests found the drug was greater than 5,000 times more effective at reducing the effects of acute radiation injury than the most effective drugs currently available. more

  28-01-2008   -   Biology

Sun, 27 Jan 2008 Scientists from J. Craig Venter Institute (JCVI) in Rockville have announced that they have crafted a bacterial genome from scratch, moving one step closer to creating entirely synthetic life forms--living cells designed and built by humans to carry out a diverse set of tasks ranging from manufacturing biofuels to sequestering carbon dioxide. The 582,970 base pair M. genitalium bacterial genome is the largest chemically defined structure synthesized in the lab.more

  16-01-2008   -   Medicine

Wed, 16 Jan 2008 NIST researchers have calibrated solutions of germanium-68 that could become the basis of a new standard reference material for this isotope. The next phase of this project involves working with RadQual to calibrate a new "mock" syringe standard that would use germanium-68 embedded in an epoxy to simulate fluorine-18 in a syringe. This would help researchers more accurately determine the amount of fluorine-18 to be injected into patients during the PET procedure so as to minimize radiation dose while still producing the best image. more

  13-01-2008   -   Physics

Sat, 12 Jan 2008 Scientists have discovered that a magnetic field can interact with the electrons in a superconductor in ways never before observed. An exceptional compound of metals -- a combination of cobalt, indium and a rare earth -- loses its resistance when cooled to just a couple of degrees above absolute zero. more

  09-01-2008   -   Biology

Wed, 09 Jan 2008 For the first time, magnetism has been used to trigger cellular reactions normally induced by drugs or hormones. The discovery was made possible by getting tiny beads -- 30 nanometers in diameter -- to bind to receptor molecules on the cell surface. When exposed to a magnetic field, the beads become magnets and cluster together through magnetic attraction, pulling receptors along with them mimicking what happens when drugs or other molecules bind to cell receptors.more

  09-01-2008   -   Physics

Wed, 09 Jan 2008 Researchers have achieved optical waveguiding of near-infrared light through features embedded in self-assembled, three-dimensional photonic crystals. Applications for the optically active crystals include low-loss waveguides, low-threshold lasers and on-chip optical circuitry.more

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