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Keyword: physics

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  • Physicists extend entanglement in Einstein experiment

    12/14/2012 6:11:59 PM PST · by neverdem · 17 replies
    Phys.org | December 6, 2012 by | Lisa Zyga
    Copyright 2012 Phys.org All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of Phys.org. Here's the link.
  • Researchers discover fastest light-driven process

    12/14/2012 3:04:56 PM PST · by neverdem · 13 replies
    Phys.org ^ | December 5, 2012 | NA
    A discovery that promises transistors – the fundamental part of all modern electronics – controlled by laser pulses that will be 10,000 faster than today's fastest transistors has been made by a Georgia State University professor and international researchers. Professor of Physics Mark Stockman worked with Professor Vadym Apalkov of Georgia State and a group led by Ferenc Krausz at the prestigious Max Planck Institute for Quantum Optics and other well-known German institutions.There are three basic types of solids: metals, semiconductors, used in today's transistors, and insulators – also called dielectrics.Dielectrics do not conduct electricity and get damaged or break...
  • Mitsubishi Reports Toyota Replication [of Iwamura's LENR transmutation of elements]

    12/12/2012 4:54:03 PM PST · by TXnMA · 166 replies
    New Energy Times ^ | December 7, 2012 | Steve Krivit
    Dec. 7, 2012 – By Steven B. Krivit – Researchers from Toyota Central Research and Development Laboratories performed an independent replication of a Mitsubishi low-energy nuclear reaction transmutation experiment, according to a physicist from Mitsubishi Heavy Industries speaking at the American Nuclear Society LENR session on Nov. 14 in San Diego, Calif. The physicist, Yasuhiro Iwamura, told the ANS audience that the Toyota researchers confirmed that nuclear changes from one element to another took place without the use of high-energy nuclear physics. Most scientists who have not followed this field closely consider such profound claims inconceivable. Toyota used a LENR...
  • Caltech engineers invent light-focusing device

    12/13/2012 10:22:21 PM PST · by neverdem · 18 replies
    Phys.org ^ | December 7, 2012 | NA
    EnlargeEngineers at Caltech have created a device (illustrated here) that can focus light into a point just a few nanometers (billionths of a meter) across -- an achievement they say may lead to next-generation applications in computing, communications, and imaging. Credit: Young-Hee Lee (Phys.org)—As technology advances, it tends to shrink. From cell phones to laptops—powered by increasingly faster and tinier processors—everything is getting thinner and sleeker. And now light beams are getting smaller, too. Engineers at the California Institute of Technology (Caltech) have created a device that can focus light into a point just a few nanometers (billionths of a...
  • Turning Pull Into Push?

    12/11/2012 4:19:15 PM PST · by neverdem · 2 replies
    ScienceNOW ^ | 10 December 2012 | Adrian Cho
    Enlarge Image Up and away. Whereas a point charge is always attracted to an underlying surface, a sideways moving line of charge can be repelled, one physicist calculates. Credit: Primož R. Ribič, Phys. Rev. Lett. (2012) It's textbook physics: An electric charge near the surface of a material gets pulled toward the surface. However, if the charge is spread out into the right shape and moves fast enough, that attraction becomes a repulsion, one physicist calculates. The odd finding could help physicists avoid unexpected effects when guiding beams of particles such as electrons. "At first I thought this was...
  • New Chemical Reaction Could Explain How Stars Form, Evolve, and Eventually Die

    12/08/2012 8:44:00 PM PST · by neverdem · 16 replies
    ScienceDaily ^ | December 7, 2012 | NA
    University of North Dakota scientist Mark Hoffmann's version of Star Search goes a long way -- a very long way -- out into the universe. Hoffmann, a computational chemist, and his colleagues Tryve Helgaker, a well-known Norwegian scientist, and co-authors E.I. Tellgren and K. Lange, also working in Norway, have discovered a molecular-level interaction that science had puzzled over for decades but had never seen. That discovery, it turns out, may redefine how science views chemical compound formation. It also answers questions about what goes on in places like white dwarfs, the super dense cores of stars nearing the end...
  • We don’t need no intuition

    12/06/2012 1:38:10 AM PST · by neverdem · 2 replies
    Chemistry World ^ | 5 December 2012 | Neil Withers
    US scientists have developed a way to solve crystal structures that combines powerful computational methods with data from experiments or databases – but that does not require much human input. Previous computational methods to predict structures rarely use experimental data, take a long time and are limited to compounds with small unit cells. They also give structures that generally have lower symmetry than those which have been experimentally determined, suggesting that the answers may not be quite right.‘One of the dirty little secrets that people don’t generally talk about is that, with a lot of these methods, you always...
  • New experiments challenge fundamental understanding of electromagnetism

    12/03/2012 2:29:16 PM PST · by neverdem · 45 replies
    Phys.org ^ | November 28, 2012 | NA
    A cornerstone of physics may require a rethink if findings at the National Institute of Standards and Technology (NIST) are confirmed. Recent experiments suggest that the most rigorous predictions based on the fundamental theory of electromagnetism—one of the four fundamental forces in the universe, and harnessed in all electronic devices—may not accurately account for the behavior of atoms in exotic, highly charged states. The theory in question is known as quantum electrodynamics, or QED, which physicists have held in high regard for decades because of its excellent track record describing electromagnetism's effects on matter. In particular, QED has been especially...
  • December 2, 1942: Enrico Fermi and atomic Chicago

    12/01/2012 8:05:44 PM PST · by smokingfrog · 4 replies
    WBEZ91.5 ^ | 12-2-11 | John Schmidt
    The story begins with a letter from Albert Einstein to Franklin D. Roosevelt in 1939. The celebrated physicist warned the president that Nazi Germany was developing the makings of an atomic bomb. Roosevelt knew what would happen if Hitler got such a weapon. The president ordered a massive secret project to make sure the U.S. beat him to it. Scientists from all over the country were enlisted in the effort. Early in 1942 Enrico Fermi and a team of physicists gathered at the University of Chicago's Metallurgical Laboratory. Their goal was to develop a self-sustaining nuclear pile. This was the...
  • As Supersymmetry Fails Tests, Physicists Seek New Ideas

    11/29/2012 3:10:46 PM PST · by neverdem · 32 replies
    Simons Science News ^ | November 20, 2012 | Natalie Wolchover
    No hints of “new physics” beyond the predictions of the Standard Model have turned up in experiments at the Large Hadron Collider, a 17-mile circular tunnel at CERN Laboratory in Switzerland that slams protons together at high energies. (Photo: CERN) As a young theorist in Moscow in 1982, Mikhail Shifman became enthralled with an elegant new theory called supersymmetry that attempted to incorporate the known elementary particles into a more complete inventory of the universe.“My papers from that time really radiate enthusiasm,” said Shifman, now a 63-year-old professor at the University of Minnesota. Over the decades, he and thousands of...
  • Still Looking Like the Higgs

    11/16/2012 9:57:42 PM PST · by neverdem · 32 replies
    ScienceNOW ^ | 15 November 2012 | Adrian Cho
    Credit: CERN Still too soon to know. That's the latest word from particle physicists working with the world's largest atom smasher—Europe's Large Hadron Collider in Switzerland—as they try to figure out whether the particle they discovered in July is precisely the long-sought Higgs boson or something a tad different. The key question is whether the new particle decays into combinations of familiar particles at the rates that physicists' standard model predicts. So far, the measured decay rates generally match expectations, but the statistical uncertainties are too large to say anything conclusive, physicists working with the gargantuan particle detectors known...
  • Light ties itself in knots - spontaneously

    10/30/2012 1:22:44 PM PDT · by Ernest_at_the_Beach · 28 replies
    The Register ^ | 29th October 2012 23:59 GMT | Richard Chirgwin •
    It’s not only possible to get light to tie itself in knots: given the right conditions, it will do so spontaneously, according to a paper published last week in Nature. El Reg has no possible hope of fully understanding this paper (published in full, an emerging trend we welcome), but one really interesting idea is right there in the abstract: “We anticipate similar spontaneous knot topology to be a universal feature of waves whose phase front is twisted and nonlinearly modulated, including superfluids and trapped matter waves.” [Emphasis added] In other words, this research has the potential to be replicated...
  • Researchers look beyond space and time to cope with quantum theory

    10/28/2012 8:50:13 PM PDT · by JerseyanExile · 78 replies
    Phys Org ^ | October 28, 2012
    Physicists have proposed an experiment that could force us to make a choice between extremes to describe the behaviour of the Universe. The proposal comes from an international team of researchers from Switzerland, Belgium, Spain and Singapore, and is published today in Nature Physics. It is based on what the researchers call a 'hidden influence inequality'. This exposes how quantum predictions challenge our best understanding about the nature of space and time, Einstein's theory of relativity. "We are interested in whether we can explain the funky phenomena we observe without sacrificing our sense of things happening smoothly in space and...
  • Scientists uncover mystery of ball lightning

    10/19/2012 9:18:30 PM PDT · by neverdem · 37 replies
    ABC (AU) ^ | October 13, 2012 | Darren Osborne
    A team of Australian scientists believe they have uncovered the cause of one of nature's most bizarre phenomenon - ball lightning. Ball lightning is typically the size of a grapefruit and lasts up to 20 seconds. "Ball lightning has been reported by hundreds of people, for hundreds of years and it has been a mystery," said CSIRO scientist John Lowke, lead author of a new study published in the Journal of Geophysical Research Atmospheres. Previous theories have suggested microwave radiation, oxidising aerosols, nuclear energy, dark matter, antimatter, and even black holes as possible causes. One recent theory suggests burning silicon...
  • Manipulators of the Quantum Realm Reap Nobel Glory

    10/09/2012 11:43:46 AM PDT · by neverdem · 14 replies
    ScienceNOW ^ | 9 October 2012 | Adrian Cho
    Enlarge Image Light touch. Serge Haroche and David Wineland (right) won the Nobel for their work manipulating the quantum states of individual atoms. Credit: CNRS and NIST The past couple of decades have witnessed a sea change in quantum physics. Previously, scientists relied on the strange rules of quantum theory mainly to explain the odd natural behavior of masses of atoms and other quantum particles such as photons. Increasingly, however, physicists are exploiting those rules to create delicate quantum states of individual particles and to do novel things with them. This year's Nobel Prize in physics honors two experimenters...
  • Awesome HD Slinky Slow-Mo…Does Gravity Really Work Like We Think It Does?

    10/04/2012 4:04:07 PM PDT · by jwsea55 · 83 replies
    Veritasium ^ | Sept 29, 2012 | Jim Caldwell
    Watching this video, I have to ask, do we really understand gravity? When we release an object from our hands, it falls. Right? Not always? Or at least, not right away? Veritasium has put some pretty cool videos to explain how science and physics work. They have been working with slinkies on a number of videos (and you thought your kid didn’t have any potential at 3 years old), this video seems to capture the essences of their work. So listening to a couple of science guys explain this, does this give one a solid enough understanding why that darn...
  • 'Tantalizing' hints of room-temperature superconductivity Doped graphite may superconduct at...

    09/19/2012 11:06:48 PM PDT · by neverdem · 9 replies
    NATURE NEWS ^ | 18 September 2012 | Edwin Cartlidge
    Doped graphite may superconduct at more than 100 şC. Researchers in Germany have claimed a breakthrough: a material that can act as a superconductor — transmit electricity with zero resistance — at room temperature and above. Superconductors offer huge potential energy savings, but until now have worked only at temperatures of lower than about -110 °C. Now, Pablo Esquinazi and his colleagues at the University of Leipzig report that flakes of humble graphite soaked in water seem to continue superconducting at temperatures of greater than 100 °C1. Even Esquinazi admits that the claim “sounds like science fiction”, but the work...
  • Atomic bond types discernible in single-molecule images

    09/14/2012 7:55:26 PM PDT · by neverdem · 33 replies
    BBC News ^ | 13 September 2012 | Jason Palmer
    A pioneering team from IBM in Zurich has published single-molecule images so detailed that the type of atomic bonds between their atoms can be discerned. The same team took the first-ever single-molecule image in 2009 and more recently published images of a molecule shaped like the Olympic rings. The new work opens up the prospect of studying imperfections in the "wonder material" graphene or plotting where electrons go during chemical reactions. The images are published in Science. The team, which included French and Spanish collaborators, used a variant of a technique called atomic force microscopy, or AFM. AFM uses a...
  • Microwave weapons: Wasted energy

    09/14/2012 12:27:13 AM PDT · by neverdem · 7 replies
    NATURE NEWS ^ | 12 September 2012 | Sharon Weinberger
    Despite 50 years of research on high-power microwaves, the US military has yet to produce a usable weapon. For some Pentagon officials, the demonstration in October 2007 must have seemed like a dream come true — an opportunity to blast reporters with a beam of energy that causes searing pain. The event in Quantico, Virginia, was to be a rare public showing for the US Air Force's Active Denial System: a prototype non-lethal crowd-control weapon that emits a beam of microwaves at 95 gigahertz. Radiation at that frequency penetrates less than half a millimetre into the skin, so the beam...
  • IU mathematician offers unified theory of dark matter, dark energy, altering Einstein field...

    09/08/2012 1:36:57 PM PDT · by neverdem · 21 replies
    Indiana University ^ | Sept. 6, 2012 | NA
    IU mathematician offers unified theory of dark matter, dark energy, altering Einstein field equations BLOOMINGTON, Ind. -- A pair of mathematicians -- one from Indiana University and the other from Sichuan University in China -- have proposed a unified theory of dark matter and dark energy that alters Einstein's equations describing the fundamentals of gravity. Shouhong Wang, a professor in the IU College of Arts and Sciences' Department of Mathematics, and Tian Ma, a professor at Sichuan University, suggest the law of energy and momentum conservation in spacetime is valid only when normal matter, dark matter and dark energy are...