Physics

Unruly plasmas: Researchers challenge Bohr-van Leeuwen theorem

Scientists of the universities in Düsseldorf and Kiel have obtained a surprising result that appears to be in conflict with standard text book knowledge. According to the fundamental Bohr-van Leeuwen theorem, the state of a classical many-particle system cannot be altered by turning on a magnetic field: in particular, a liquid will remain a liquid and a crystal will remain a crystal. In an article published in the current issue of the journal Physical Review Letters Dr.

Novel beams made of twisted atoms

Physicists have, for the first time, now built a theoretical construct of beams made of twisted atoms. These findings by Armen Hayrapetyan and colleagues at Ruprecht-Karls-University Heidelberg in Germany are about to be published in the European Physical Journal D. These so-called atomic Bessel beams can, in principle, have potential applications in quantum communication as well as in atomic and nuclear processes.

Novel beams made of twisted atoms: Scientists can now theoretically construct atomic beams of a particular kind

Scientists can now theoretically construct atomic beams of a particular kind. Physicists have, for the first time, now built a theoretical construct of beams made of twisted atoms. These so-called atomic Bessel beams can, in principle, have potential applications in quantum communication as well as in atomic and nuclear processes.

Diamonds are a laser scientist's new best friend

Diamond-based lasers – once a James Bond fantasy – are now becoming a reality, following research at the University of Strathclyde.

UPDATE: NASA Invites Media to View Orion Stationary Recovery Testing

NASA is offering media the opportunity to view key testing of splashdown recovery operations for the agency's Orion spacecraft on Thursday, Aug. 15, at Naval Station Norfolk in Virginia.

NASA Invites Media to View Orion Stationary Recovery Testing

NASA is offering media the opportunity to view key testing of splashdown recovery operations for the agency's Orion spacecraft on Thursday, Aug. 15, at Naval Station Norfolk in Virginia.

High-speed camera captures dancing droplets for scientific 'photo album,' study (w/ Video)

The splash from rain hitting a windowpane or printer ink hitting paper all comes down to tiny droplets hitting a surface, and what each of those droplets does. Cornell University researchers have produced a high-resolution "photo album" of more than 30 shapes an oscillated drop of water can take. The results, a fundamental insight into how droplets behave, could have applications in everything from inkjet printing to microfluidics.

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.

Altering organic molecules' interaction with light

Enhancing and manipulating the light emission of organic molecules is at heart of many important technological and scientific advances, including in the fields of organic light emitting devices, bio-imaging, bio-molecular detection. Researchers have now discovered a new platform that enables dramatic manipulation of the emission of organic molecules when simply suspended on top of a carefully designed planar slab with a periodic array of holes: So-called photonic crystal surface.

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.

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