Physics

Trophic coherence explains why networks have few feedback loops and high stability

(Phys.org)—Complexity – defined as having emergent properties or traits that are not a function of, and are therefore difficult or inherently impossible to predict from, the discrete components comprising the system – is a characteristic of complex systems at a wide range of scales (such as genes, neurons and other cells, brains, computers, language, and both natural and sociopolitical ecosystems) that comprise interconnected elements capable of self-modification via feedback loops.

ATLAS sees first direct evidence of light-by-light scattering at high energy

Physicists from the ATLAS experiment have found the first direct evidence of high energy light-by-light scattering, a very rare process in which two photons – particles of light – interact and change direction. The result confirms one of the oldest predictions of quantum electrodynamics (QED).

NASA Cargo Launches to Space Station Aboard SpaceX Resupply Mission

Experiments seeking a better understanding of Parkinson’s disease and the origin of cosmic rays are on their way to the International Space Station aboard a SpaceX Dragon spacecraft following today’s 12:31 p.m. EDT launch.

Single molecules can work as reproducible transistors -- at room temperature

Researchers have now reproducibly demonstrated current blockade -- the ability to switch a device from the insulating to the conducting state where charge is added and removed one electron at a time -- using atomically precise molecular clusters at room temperature. The study shows that single molecules can function as reproducible circuit elements such as transistors or diodes that can easily operate at room temperature.

New class of chemical reaction discovered

A new study has identified the significance of a new class of chemical reactions -- previously ignored -- involving three molecules that each participate in the breaking and forming of chemical bonds.

Exotic quantum states made from light

Physicists have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers.

X-ray imaging with a significantly enhanced resolution

Physicists have come up with a method that could significantly improve the quality of X-ray images in comparison to conventional methods. Incoherent diffractive imaging (IDI) could help to image individual atoms in nanocrystals or molecules faster and with a much higher resolution.

NASA Announces Television Coverage for Aug. 21 Solar Eclipse

On Monday, Aug. 21, all of North America will be treated to an eclipse of the Sun, and NASA Television will carry it live from coast to coast from unique vantage points on the ground and from aircraft and spacecraft, including the International Space Station. Coverage will be featured during the live four-hour broadcast Eclipse Across America: Thro

NASA Announces Television Coverage for Aug. 21 Solar Eclipse

On Monday, Aug. 21, all of North America will be treated to an eclipse of the Sun, and NASA Television will carry it live from coast to coast from unique vantage points on the ground and from aircraft and spacecraft, including the International Space Station. Coverage will be featured during the live four-hour broadcast Eclipse Across America: Thro

New SQUID-based detector opens up new fields of study with new level of sensitivity

Investigators have developed a new sensor array-based instrument that offers ultra-low noise detection of small amounts of energy for a number of applications. The new device allows for the collection of data from many more detectors than was previously possible.

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