Physics

Large-area picosecond photodetectors push timing envelope

The Large Area Picosecond Photodetector (LAPPD) collaboration has developed big detectors that push the timing envelope, measuring the speed of particles with a precision down to trillionths of a second.

New diamond and gold-based techniques let scientists measure and control the temperature inside living cells

How do you take the temperature of a cell? The familiar thermometer from a doctor's office is slightly too big considering the average human skin cell is only 30 millionths of a meter wide. But the capability is significant; developing the right technology to gauge and control the internal temperatures of cells and other nanospaces might open the door to a number of defense and medical applications: better thermal management of electronics, monitoring the structural integrity of high-performance materials, cell-specific treatment of disease and new tools for medical research.

Media Invited to NASA Google+ Hangout on Wildfire and Climate Change

NASA will host a Google+ Hangout at 1 p.m. EDT Friday, Aug. 9, about wildfire research and what a changing climate could mean for future fire activity in the United States.

Physicists freeze motion of light for a minute

Physicists in Darmstadt have been able to stop something that has the greatest possible speed and that never really stops. We're talking about light. Already a decade ago, physicists stopped it very for a short moment. In previous years, this extended towards stop times of a few seconds for simple light pulses in extremely cold gases and special crystals. But now the researchers at Darmstadt extended the possible duration and applications for freezing the motion of light considerably.

New technique allows closer study of how radiation damages materials

Scientists have developed a technique that provides real-time images of how magnesium changes at the atomic scale when exposed to radiation. The technique may give researchers new insights into how radiation weakens the integrity of radiation-tolerant materials, such as those used in space exploration and in nuclear energy technologies.

Quantum communication controlled by resonance in 'artificial atoms'

Researchers have developed a method to control a quantum bit for electronic quantum communication in a series of quantum dots, which behave like artificial atoms in the solid state.

Unruly plasmas

Physicists performed a series of exact computer simulations of a liquid layer of charged particles (Plasma) and cooled it rapidly. According to the text book theorem the fluid would crystallize instantaneously when it is cooled, no matter whether a magnetic field is present or not. "We cooled the liquid very quickly, and in the presence of a strong magnetic field we observed a result that we first could not believe: the system remained fluid for a very long time," one of the researchers said.

The molecule 'scanner': The world's smallest terahertz detector

Molecules could soon be "scanned" in a fashion similar to imaging screenings at airports, thanks to a detector developed by University of Pittsburgh physicists.

The molecule 'scanner': World's smallest terahertz detector invented

Molecules could soon be "scanned" in a fashion similar to imaging screenings at airports, thanks to a new detector.

NASA Television Updates Broadcast Time for Aug. 22 Russian Spacewalk

NASA Television will provide live coverage as two Russian cosmonauts venture outside the International Space Station on spacewalks Friday, Aug. 16, and Thursday, Aug. 22.

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