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Keyword: physics

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  • Inflating the Evidence

    06/27/2012 8:49:56 PM PDT · by lasereye · 18 replies
    Institute for Creation Research ^ | 2007 | David F. Coppedge
    In their quest to disprove design in the universe, scientists have produced evermore speculative models of cosmology. Big Bang cosmology, for example, relies heavily on a process called inflation, an ad hoc speculation that remains highly controversial 26 years after it was first proposed. By the 1980s, cosmologists were struck by the homogeneity and flatness of our universe. In other words, matter appears to be uniformly distributed on a large scale, and the average density of matter in the universe is balanced against its expansion rate to a high degree of precision. These and other properties appear too finely tuned...
  • Wires turn salt water into freshwater

    06/10/2012 10:10:32 PM PDT · by Kevmo · 46 replies
    Phys.Org ^ | June 8, 2012 | Lisa Zyga
    June 8, 2012 by Lisa Zyga (Phys.org) -- As a rising global population and increasing standard of living drive demand for freshwater, many researchers are developing new techniques to desalinate salt water. Among them is a team of scientists from The Netherlands, who have shown how to transform brackish (moderately salty) water into potable freshwater using just a pair of wires and a small voltage that can be generated by a small solar cell. The simple technique has the potential to be more energy-efficient than other techniques because of the minimal amount of mixing between the treated and untreated...
  • Tabletop X-rays light up

    06/09/2012 12:14:48 PM PDT · by neverdem · 8 replies
    Nature News ^ | 08 June 2012 | Katherine Bourzac
    Compact device promises to open window on chemical reactions in the lab. The pressurized, cylindrical chamber fits in the palm of Margaret Murnane’s hand. Yet out of one end of the device comes an X-ray beam that packs almost as much punch as the light generated by massive particle accelerators. Murnane and Henry Kapteyn, both physicists at JILA in Boulder, Colorado, a joint institute of the University of Colorado and the US National Institute of Standards and Technology, have reported the first tabletop source of ultra-short, laser-like pulses of low energy, or ‘soft’, X-rays. The light, capable of probing the...
  • Giant black hole kicked out of home galaxy

    06/04/2012 11:22:44 AM PDT · by Red Badger · 38 replies
    http://phys.org ^ | June 04, 2012 | Provided by Chandra X-ray Center
    Astronomers have found strong evidence that a massive black hole is being ejected from its host galaxy at a speed of several million miles per hour. New observations from NASA's Chandra X-ray Observatory suggest that the black hole collided and merged with another black hole and received a powerful recoil kick from gravitational wave radiation. "It's hard to believe that a supermassive black hole weighing millions of times the mass of the sun could be moved at all, let alone kicked out of a galaxy at enormous speed," said Francesca Civano of the Harvard-Smithsonian Center for Astrophysics (CfA), who led...
  • Landmark calculation clears the way to answering how matter is formed

    05/28/2012 12:11:23 PM PDT · by Ernest_at_the_Beach · 21 replies
    phys.org ^ | May 25, 2012 | Cindy Weiss
    May 25, 2012 By Cindy Weiss EnlargeThomas C. Blum, Associate Professor, Physics. Credit: Daniel Buttrey/UConn (Phys.org) -- An international collaboration of scientists, including Thomas Blum, associate professor of physics, is reporting in landmark detail the decay process of a subatomic particle called a kaon information that may help answer fundamental questions about how the universe began. Ads by GoogleSix Sigma Black Belt - Get Trained & Six Sigma Certified. Flexible, Top Program 100% online. - www.VillanovaU.com/SixSigmaThe research, reported online in the March 30, 2012 Physical Review Letters, used breakthrough techniques on some of the worlds fastest supercomputers to...
  • Symphony of science: The Quantum World

    05/27/2012 9:45:37 PM PDT · by Windflier · 46 replies
    YouTube ^ | September 2011 | John D Boswell
    A musical investigation into the nature of atoms and subatomic particles, the jiggly things that make up everything we see. Featuring Morgan Freeman, Stephen Hawking, Michio Kaku, Brian Cox, Richard Feynman, and Frank Close. "The Quantum World" is the eleventh installment in the ongoing Symphony of Science music video series. Track back to source website: Symphony of Science
  • Chinese Physicists Teleport Photons Over 100 Kilometers

    05/12/2012 7:52:50 PM PDT · by Innovative · 59 replies
    Popular Science ^ | May 11, 2012 | Dan Nosowitz
    Teleportation, sci-fi-y as it sounds, is actually not fictional or even new; two years ago, Chinese physicists broke the then-current record for quantum teleportation by teleporting photons over 10 miles. But a new effort from that same team demolishes that record, beaming the photons over 97 kilometers. The physicists, working from the University of Science and Technology of China in Shanghai, have again taken advantage of quantum entanglement for the purposes of moving an object from one place to another without ever moving in the space between. According to Technology Review, "The idea is not that the physical object is...
  • Freeman Dyson: Science on the Rampage

    05/09/2012 10:28:59 AM PDT · by neverdem · 37 replies
    New York Review of Books ^ | April 5, 2012 | Freeman Dyson
    Physics on the Fringe: Smoke Rings, Circlons, and Alternative Theories of Everything by Margaret Wertheim Walker, 323 pp., $27.00 Pierpont Morgan Library/Art Resource An engraving by William Blake from The Song of Los, 1795 Physics on the Fringe describes work done by amateurs, people rejected by the academic establishment and rejecting orthodox academic beliefs. They are often self-taught and ignorant of higher mathematics. Mathematics is the language spoken by the professionals. The amateurs offer an...
  • Giant Black Hole Shreds and Swallows Helpless Star

    05/03/2012 5:19:20 PM PDT · by neverdem · 45 replies
    ScienceNOW ^ | 2 May 2012 | Ken Croswell
    Enlarge Image Slaughtered star. A black hole (upper left) tears a helium-rich star to shreds. Credit: S. Gezari/Johns Hopkins University and J. Guillochon, UC Santa Cruz/NASA Some people seem born under an unlucky star. But some stars are equally unlucky themselves. Astronomers have spotted a star in another galaxy plunging toward a giant black hole and being ripped to shreds, sparking a flare so brilliant that observers detected it from a distance of 2.1 billion light-years. By watching the flare brighten and fade, scientists have achieved the unprecedented feat of reconstructing the life story of the doomed sun. Giant...
  • Graphene emits infrared light

    04/25/2012 11:44:33 PM PDT · by neverdem · 10 replies
    physicsworld.com ^ | Apr 25, 2012 | Belle Dum
    Physicists in the US have discovered yet another useful property of the wonder material graphene it can function much like a laser when excited with very short femtosecond light pulses. The team has shown that the material has two technologically important properties population inversion of electrons and optical gain. The findings suggest that graphene could be used to make a variety of optoelectronics devices, including broadband optical amplifiers, high-speed modulators, and absorbers for telecommunications and ultrafast lasers. Graphene is a sheet of carbon atoms arranged in a honeycomb-like lattice just one atom thick. Since its discovery in 2004,...
  • Magnetic fields can send particles to infinity....[and beyond!]

    04/18/2012 1:17:03 PM PDT · by Red Badger · 30 replies
    http://phys.org ^ | 04-17-2012 | Provided by FECYT - Spanish Foundation for Science and Technology
    Researchers from the Complutense University of Madrid (UCM, Spain) have mathematically shown that particles charged in a magnetic field can escape into infinity without ever stopping. One of the conditions is that the field is generated by current loops situated on the same plane. At the moment this is a theoretical mathematical study, but two researchers from UCM have recently proved that, in certain conditions, magnetic fields can send particles to infinity, according to the study published in the journal Quarterly of Applied Mathematics. "If a particle 'escapes' to infinity it means two things: that it will never stop, and...
  • Serious blow to dark matter theories? New study finds mysterious lack of dark matter...

    04/18/2012 12:11:06 PM PDT · by Red Badger · 58 replies
    http://phys.org ^ | 04-18-2012 | Provided by ESO
    Full title: Serious blow to dark matter theories? New study finds mysterious lack of dark matter in Sun's neighborhood The most accurate study so far of the motions of stars in the Milky Way has found no evidence for dark matter in a large volume around the Sun. According to widely accepted theories, the solar neighbourhood was expected to be filled with dark matter, a mysterious invisible substance that can only be detected indirectly by the gravitational force it exerts. But a new study by a team of astronomers in Chile has found that these theories just do not fit...
  • Mysterious Particle Found After Decades of Searching (Majorana fermion)

    04/17/2012 12:16:44 PM PDT · by presidio9 · 16 replies
    Live Science ^ | April 17, 2012 | Jesse Emspak
    An elusive particle that is its own antiparticle may have been found, and, if confirmed, would be the first time a phenomenon predicted decades ago has been seen in a real system. Some researchers suggest that in the future, this mysterious particle called a Majorana fermion could be useful in carrying bits of information in quantum computers. In a paper published in the journal Science Thursday, Vincent Mourikand Leo P. Kouwenhoven said they were able to make the Majorana fermions appear by exposing a small circuit to a magnetic field. Until now, the only suggestion of the particle's existence was...
  • Nanomachines could benefit from superlubricity

    04/11/2012 11:16:01 PM PDT · by neverdem · 5 replies
    Physics World ^ | Apr 5, 2012 | Jon Cartwright
    Researchers in China and Australia have observed superlubricity the dropping of friction to near zero on length scales much larger than before. They say that the phenomenon, which they measured in sheared pieces of graphite, could find applications in sensitive microscopic resonators or nanoscale gyroscopes. Superlubricity is sometimes used to mean simply very low friction, but the original meaning is that the friction between two surfaces disappears almost completely. Proposed in the early 1990s by Motohisa Hirano, then at the Nippon Telegraph and Telephone Corporation in Tokyo, Japan, and others, it relies on a special arrangement of atoms...
  • Plasma Flashlight Zaps Bacteria

    04/07/2012 11:17:23 PM PDT · by neverdem · 19 replies
    ScienceNOW ^ | 4 April 2012 | Jon Cartwright
    Enlarge Image Light therapy . A portable plasma flashlight can kill bacteria in minutes. (Credit: X. Pei et al., Journal of Physics D: Applied Physics) Credit: X. Pei et al., Journal of Physics D: Applied Physics (2012) Killing harmful bacteria in hospitals is difficult; out in the field, it can be an even bigger problem. Now, researchers may have a means for remote disinfection in a portable "flashlight" that shines a ray of cold plasma to kill bacteria in minutes. Medical scientists have high hopes for plasmas. Produced in electrical discharges, these gases of free electrons and ions have...
  • A star explodes and turns inside out

    04/04/2012 10:34:51 PM PDT · by U-238 · 10 replies
    Astronomy Magazine ^ | 3/4/2012 | Chandra X-ray Center
    A new X-ray study of the remains of an exploded star indicates that the supernova that disrupted the massive star may have turned it inside out in the process. Using long observations of Cassiopeia A (Cas A), a team of scientists has mapped the distribution elements in the supernova remnant in unprecedented detail. This information shows where the different layers of the pre-supernova star are located 300 years after the explosion, and provides insight into the nature of the supernova. The artists illustration shows a simplified picture of the inner layers of the star that formed Cas A just before...
  • How black holes grow

    04/03/2012 11:31:22 PM PDT · by U-238 · 19 replies
    Astronomy Magazine ^ | 3/3/2012 | University of Utah, Salt Lake City
    A study led by a University of Utah astrophysicist found a new explanation for the growth of supermassive black holes in the center of most galaxies: They repeatedly capture and swallow single stars from pairs of stars that wander too close. Using new calculations and previous observations of our Milky Way and other galaxies, We found black holes grow enormously as a result of sucking in captured binary star partners, said Ben Bromley from the University of Utah in Salt Lake City. I believe this has got to be the dominant method for growing supermassive black holes, he said. There...
  • New data support Einstein on accelerating universe

    04/03/2012 1:00:38 AM PDT · by U-238 · 59 replies
    Science News ^ | 2/2/2012 | Elizabeth Quill
    Einstein is still the boss, say researchers with the BOSS project for measuring key properties of the universe. BOSS, for Baryon Oscillation Spectroscopic Survey, has measured the distance to faraway galaxies more precisely than ever before, mapping the universe as it existed roughly 6 billion years ago, when it was only 63 percent of its current size. The findings suggest that the mysterious dark energy causing the universe to expand at an accelerating rate was foreseen by Einstein, the researchers reported April 1 at the American Physical Society meeting. To keep the universe in a static state, Einstein added a...
  • Scientists Manipulate Electrons Into Material Never Seen on Earth

    03/29/2012 9:51:24 PM PDT · by neverdem · 10 replies
    gizmodo.com ^ | Mar 14, 2012 | Kristen Philipkoski
    Stanford scientists have created designer electrons that behave as if they were exposed to a magnetic field of 60 Teslaa force 30 percent stronger than anything ever sustained on Earth. The work could lead to a revolution in the materials that make everything from video displays to airplanes to mobile phones. "The behavior of electrons in materials is at the heart of essentially all of today's technologies," said Hari Manoharan, associate professor of physics at Stanford and a member of SLAC's Stanford Institute for Materials and Energy Sciences, who led the research. "We're now able to tune the fundamental properties...
  • Physicists find patterns in new state of matter

    03/29/2012 4:45:02 PM PDT · by U-238 · 20 replies
    Physorg.com ^ | 3/29/2012 | Physorg.com
    In a paper published in the March 29 issue of the journal Nature, the scientists describe the emergence of spontaneous coherence, spin textures and phase singularities when excitonsthe bound pairs of electrons and holes that determine the optical properties of semiconductors and enable them to function as novel optoelectronic devicesare cooled to near absolute zero. This cooling leads to the spontaneous production of a new coherent state of matter which the physicists were finally able to measure in great detail in their basement laboratory at UC San Diego at a temperature of only one-tenth of a degree above absolute zero....