Physics

Cause of LED 'efficiency droop' identified

Researchers have identified the mechanism behind a plague of LED light bulbs: a flaw called "efficiency droop" that causes LEDs to lose up to 20 percent of their efficiency as they are subjected to greater electrical currents.

Plasmonic black metals: Breakthrough in solar energy research?

The use of plasmonic black metals could someday provide a pathway to more efficient photovoltaics -- the use of solar panels containing photovoltaic solar cells -- to improve solar energy harvesting, according to researchers.

NASA Invites Reporters and Public to Curiosity First Anniversary Event

NASA officials and crew members aboard the International Space Station will observe the first anniversary of the Curiosity rover's landing on Mars at a public event in Washington from noon-1:30 p.m. EDT Tuesday, Aug. 6.

Beam me up, Scotty! Would teleporting humans into space be possible?

In the science fiction show, Star Trek, teleportation is a regular and significant feature. But how much time and power is required to send the data needed to teleport a human being?

Accreditation Open for Launches, Hurricane Study Media Day at NASA's Wallops Flight Facility

Media accreditation now is open for two launches and a media viewing opportunity in September from NASA's Wallops Flight Facility in Virginia. The media activities are associated with the launch of NASA's Lunar Atmosphere and Dust Environment Explorer mission, the agency's Hurricane and Severe Storm Sentinel Mission research flights and the launch of Orbital Sciences Corp.'s demonstration mission to the International Space Station.

NASA Awards Construction and Engineering Services Contract

NASA has selected Gilbane Building Company of Houston to provide Construction Management and Professional Engineering Services (CoMPES) at the agency's Johnson Space Center in Houston.

NASA Extends Contract for Supercomputing Support Services

NASA will exercise the fifth one-year option on a contract with Computer Sciences Corp. of Lanham, Md., for supercomputing support services at NASA's Ames Research Center in Moffett Field, Calif.

NASA Selects Snow and Ice Distributed Active Archive Center Contract

NASA has selected the University of Colorado Boulder for the management and operations of the Earth Observing System Data and Information System Snow and Ice Distributed Active Archive Center.

NASA Invites Reporters and Public to Curiosity First Anniversary Event

NASA officials and crew members aboard the International Space Station will observe the first anniversary of the Curiosity rover's landing on Mars at a public event in Washington from noon-1:30 p.m. EDT Tuesday, Aug. 6.

Model-independent measurement of dark matter mass could lead to future discoveries

(Phys.org) —Determining the mass of dark matter particles requires accounting for several factors, one of which is the velocity distribution of the particles. Most current estimates of dark matter mass involve assumptions regarding the velocity distribution, since this distribution involves a high degree of uncertainty. In a new paper, physicists have presented a model-independent method for determining the dark matter mass that doesn't require any assumptions about the velocity distribution, marking the first time that the dark matter mass can be accurately measured in an unbiased way.

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