Physics

What can go wrong when computer simulations applied outside their original context

In an article about to be published in European Physical Journal Plus, Daan Frenkel from the University of Cambridge, UK, outlines the many pitfalls associated with simulation methods such as Monte Carlo algorithms or other commonly used molecular dynamics approaches.

Discovery of increase in magnetic moment at grain boundaries

The NIMS Structural Materials Unit, in joint research with a group at the Kumamoto University Graduate School of Science and Technology, experimentally measured the 3-D electronic state of pure iron and discovered a phenomenon in which magnetic moment, which is one of physical properties expressing magnetic characteristics, increases at grain boundaries, and also clarified that the increase in magnetic moment depends on the grain boundary structure.

NASA Researchers/Airmen to Honor Black History Month

See ''Red Tails to Red Planet'' at The Virginia Air & Space Center (VASC), NASA Langley's official visitors center, Sat., Feb. 9.

NASA to Launch Ocean Wind Monitor to Space Station

In a clever reuse of hardware originally built to test parts of NASA's QuikScat satellite, the agency will launch the ISS-RapidScat instrument to the International Space Station in 2014 to measure ocean-surface wind speed and direction.

73. First Look at an Atom's Shadow

Smallest shadow ever captured.

Can dark energy be explained by symmetrons?

(Phys.org)—A field that permeates the universe and gives rise to a new force, or "fifth force," between massive objects may be a candidate for dark energy and an explanation for why the expansion of the universe is accelerating. This field, called the symmetron field, is so named because it has a symmetry in regions of high density, while in regions of low density, such as a vacuum, the symmetry is broken and the field mediates the new force.

Nanophotonics enables new kind of optical spectrometer

By bringing nanophotonics technology to traditional optical spectroscopy, a new kind of optical spectrometer with functions of sensing and spectral measurement has been recently demonstrated.

Researchers demonstrate laser cooling of a semiconductor

(Phys.org)—A team of physicists working in Singapore has, for the first time, demonstrated the cooling of a semiconductor using a laser. To achieve this feat, the team, as they describe in their paper published in the journal Nature, used a pump laser at a specified wavelength to annihilate longitudinal optical phonons (LOPs) causing a lowering of the temperature of the cadmium sulphide (CdS) sample.

NASA Solicits Ideas for International Space Station Research

NASA wants to know how you can improve the International Space Station as a technology test bed.

NASA, Newseum Present Media Preview Of PBS' Earth From Space

NASA and the Newseum will host a preview for news media of the upcoming NOVA special, "Earth from Space," at noon EST Monday, Feb. 4, at the Newseum, 555 Pennsylvania Ave. NW in Washington.

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