Science
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What is a quaternion? A quaternion is a mathematical abstraction just like a real number, complex number, tensor, or manifold. A quaternion is basically a type of complex number that consists of four values, one of which is real, while the other three are imaginary.
Quaternions
The Outstanding Referee program was instituted in 2008 to recognize scientists who have been exceptionally helpful in assessing manuscripts for publication in the APS journals. By means of the program, APS expresses its appreciation to all referees, whose efforts in peer review not only keep the standards of the journals at a high level, but in many cases also help authors to improve the quality and readability of their articles – even those that are not published by APS. The highly selective Outstanding Referee program annually recognizes about 150 of the roughly 60,000 currently active referees.
Outstanding Referees Program
The demonstration shows the viability of solid-state quantum computers, which – unlike earlier gas- and liquid-state systems – may represent the future of quantum computing because they can be easily scaled up in size. Current quantum computers are typically very small and – though impressive – cannot yet compete with the speed of larger, traditional computers. The multinational team included USC Professor Daniel Lidar and USC postdoctoral researcher Zhihui Wang, as well as researchers from the Delft University of Technology in the Netherlands, Iowa State University and the University of California, Santa Barbara. Their findings will be published on April 5 in Nature . The team's diamond quantum computer system featured two quantum bits (called "qubits"), made of subatomic particles.
Quantum computer built inside a diamond
Physicists have known for decades that, in principle, a semiconductor device can emit more light power than it consumes electrically. Experiments published in Physical Review Letters finally demonstrate this in practice, though at a small scale. The energy absorbed by an electron as it traverses a light-emitting diode is equal to its charge times the applied voltage. But if the electron produces light, the emitted photon energy, which is determined by the semiconductor band gap, can be much larger. Usually, however, most electrons create no photon, so the average light power is less than the electrical power consumed.
Physics - Optical Device is More Than 100% Efficient
Physics - Scenic Route for Sound Allows Extra Control
Physicists have discovered surprising ways to manipulate the propagation of waves, notably light, by using structures assembled from tiny elements. In Physical Review Letters , researchers propose to alter sound waves by diverting them through an array of narrow, circuitous channels, a method that wouldn’t work for light. Simulations confirm that so-called metamaterials composed of such channels have unusual properties that let them refract sound in the “wrong” direction and could improve ultrasonic imaging. For years, researchers have been changing the way electromagnetic radiation travels by engineering materials with internal structures on the scale of the wavelength. In so-called photonic crystals, propagation of some waves is prevented by the cancellation of waves. More dramatic effects appear using arrays of tiny resonators that are tuned to respond strongly to the incoming wave frequency.Encoding many channels on the same frequency through radio vorticity: first experimental test
To start, select a journal from the drop-down list. Note that if the journal name has changed, you will need to select the appropriate name to find the content published under that title. In the Volume number field enter the volume number of the article, usually the number in bold in a reference. For journals that do not use volume numbers - ie.
To start, select a journal from the drop-down list. Note that if the journal name has changed, you will need to select the appropriate name to find the content published under that title. In the Volume number field enter the volume number of the article, usually the number in bold in a reference.
Dome-shaped EUV Waves from Rotating Active Regions
Dark Matter Clump Furrows Brows: Scientific American Podcast
60-Second Space | Space Dark matter doesn't usually collide much with itself or with ordinary matter, but it appears to be uncharacteristically clumping in the galaxy cluster A520. John Matson reports March 5, 2012 |
A model burster - MIT News Office
For the first time, researchers at MIT and elsewhere have detected all phases of thermonuclear burning in a neutron star. The star, located close to the center of the galaxy in the globular cluster Terzan 5, is a “model burster,” says Manuel Linares, a postdoc at MIT’s Kavli Institute for Astrophysics and Space Research. Linares and his colleagues from MIT, McGill University, the University of Minnesota and the University of Amsterdam analyzed X-ray observations from NASA’s Rossi X-ray Timing Explorer (RXTE) satellite, and discovered the star is the first of its kind to burst the way that models predict. What’s more, the discovery may help explain why such a model star has not been detected until now.
2/15/2012--Introduced.Recognizes the importance of transformative early career scientific research. Recognizes the 100th anniversary of the Research Corporation for Science Advancement for its lasting achievements in the field of innovative scientific research. Recent News Coverage Hmmmm, no news coverage found for this bill at this time. This means that this this bill has not yet been mentioned on a publicly-searchable news website by either its official number (for example, "H.R. 3200") or title (for example, "America's Affordable Health Choices Act of 2009").
H.Res.550: Expressing the support of the House of Representatives for innovative transformative research... OpenCongress
WILMINGTON, NC (WECT) - Something is shaking the southeast and has been for quite some time. Carolina Beach resident Jody Smith was enjoying a Saturday morning with her son Roman when she felt and heard a 'boom.' Her son walked to her and asked, "Mommy, what was that?" Smith didn't know how to respond. "It's a shaking feeling," Smith added. "More than thunder and more than a truck going by.
What is causing the 'booms'? - WECT TV6-WECT.com:News, weather & sports Wilmington, NC
New Super-Black Material Absorbs 99 Percent of All Light That Dares to Strike It | Popular Science
Ultra-Absorbent Nanomaterial This view (0.03 inches wide) shows the internal structure of a carbon nanotube coating that absorbs about 99 percent of the ultraviolet, visible, infrared, and far-infrared light that strikes it. A section of the coating, which was grown on smooth silicon, was removed to show the tubes' vertical alignment. NASA Goddard Space Flight Center(c)1999 William J. Beaty How did I get involved with "static" electricity? What is my level of expertise? Why should you trust what I say, since many of my statements contradict your textbooks ?
Longtime Playing with Electrostatics
Weird Science: Report your unusual phenomena
Have you experienced a bizarre and inexplicable event? Well, you're not alone! Check out our large collection of unusual phenomena reports below. Then add your own report to the growing collection.Timothy Gowers is surprised and delighted that thousands of mathematics and other researchers have joined him in a public pledge not to have anything to do with Elsevier, the Amsterdam-based academic publishing giant. He is leading a boycott because of company practices that he says hinder the dissemination of research.