18-03-2008   -   Physics

Mon, 17 Mar 2008 How Fundamental Particles Lose Track Of Quantum Mechanical Properties. Physicists report a series of experiments in Science that mark an important step toward understanding a longstanding fundamental physics problem of quantum mechanics. The problem the physicists addressed is how a fundamental particle in matter loses track of its quantum mechanical properties through interactions with its environment.more

  16-03-2008   -   Medicine

Sat, 15 Mar 2008 Lymphoma Patients Benefit From Combined PET-CT Scanning, Study Suggests. Combined positron emission tomography and computed tomography imaging of lymphoma patients is a more effective method to evaluate response to radiation therapy, and may help patients avoid unnecessary follow-up treatments, a new study suggests. The fused imaging results in greater accuracy when evaluating treatment results. more

  16-03-2008   -   Physics

Sun, 16 Mar 2008 Closing The "Pseudogap" On Superconductivity. One of the biggest mysteries in studying high-temperature (Tc) superconductors - materials that conduct electrical current with no resistance below a certain transition temperature - is the origin of a gap in the energy level of the materials" electronic spectrum. Physicists are researching this "pseudogap." more

  09-03-2008   -   Biology

Sun, 09 Mar 2008 New Stem Cell Technique Improves Genetic Alteration. Researchers have discovered a dramatically improved method for genetically manipulating human embryonic stem cells, making it easier for scientists to study and potentially treat thousands of disorders ranging from Huntington"s disease to muscular dystrophy and diabetes. more

  04-03-2008   -   Nuclear

Tue, 04 Mar 2008 New Material Shows Great Promise For Nuclear Waste Clean-Up. Nuclear power has advantages, but, if this method of making power is to be viable long term, discovering new solutions to radioactive waste disposal and other problems are critical. Chemists are now focusing on metal sulfide materials as a possible source for nuclear waste remediation methods. The new material is extremely successful in removing strontium from a sodium-heavy solution, which has concentrations similar to those in real liquid nuclear waste. more

  02-03-2008   -   Physics

Sat, 01 Mar 2008 Redefine Kilogram Based On Universal Constants, Scientists Urge. The kilogram is losing weight and many scientists agree that it"s time to redefine it. They are hoping to redefine the kilogram by basing it on standards of universal constants rather than on an artifact standard. "The idea is to replace the single master kilogram with something based on physical constants, rather than an artifact that could be damaged accidentally," says one mechanical engineer.more

  25-02-2008   -   Biology

Mon, 25 Feb 2008 Lensless Camera Uses X-rays To View Nanoscale Materials And Biological Specimens. X-rays have been used for decades to take pictures of broken bones, but scientists have now developed a lensless X-ray technique that can take images of ultra-small structures buried in nanoparticles and nanomaterials, and features within whole biological cells such as cellular nuclei. more

  18-02-2008   -   Physics

Mon, 18 Feb 2008 Laser Beam Believed To Set Record For Intensity. If you could hold a giant magnifying glass in space and focus all the sunlight shining toward Earth onto one grain of sand, that concentrated ray would approach the intensity of a new laser beam. The pulsed laser beam lasts just 30 femtoseconds. A femtosecond is a millionth of a billionth of a second. Such intense beams could help scientists develop better proton and electron beams for radiation treatment of cancer, among other applications.more

  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

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