Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Physics News

  • New dynamic dependency framework may lead to better neural social and tech systems models

    Many real-world complex systems include macroscopic subsystems which influence one another. This arises, for example, in competing or mutually reinforcing neural populations in the brain, spreading dynamics of viruses, and elsewhere. It is therefore important to understand how different types of inter-system interactions can influence overall collective behaviors.
    Fri, 22 Feb 2019 16:21:54 EST
  • A quantum magnet with a topological twist

    Taking their name from an intricate Japanese basket pattern, kagome magnets are thought to have electronic properties that could be valuable for future quantum devices and applications. Theories predict that some electrons in these materials have exotic, so-called topological behaviors and others behave somewhat like graphene, another material prized for its potential for new types of electronics.
    Fri, 22 Feb 2019 13:13:04 EST
  • Navy files for patent on room-temperature superconductor

    A scientist working for the U.S. Navy has filed for a patent on a room-temperature superconductor, representing a potential paradigm shift in energy transmission and computer systems.
    Fri, 22 Feb 2019 12:00:22 EST
  • Laser-driven particle accelerator that can generate pairs of electron beams with different energies

    Researchers at LMU have built the first-ever laser-driven particle accelerator that can generate pairs of electron beams with different energies.
    Fri, 22 Feb 2019 09:35:52 EST
  • A new framework to predict spatiotemporal signal propagation in complex networks

    Past studies have found that a variety of complex networks, from biological systems to social media networks, can exhibit universal topological characteristics. These universal characteristics, however, do not always translate into similar system dynamics. The dynamic behavior of a system cannot be predicted from topology alone, but rather depends on the interaction of a network's topology with the dynamic mechanisms that determine the relationship between its nodes.
    Fri, 22 Feb 2019 09:30:03 EST
  • Engineering wave reflections with power flow-conformal metamirrors

    Metasurfaces are two-dimensional (2-D) metamaterials that can control scattering waves of a light beam. Their applications include thin-sheet polarizers, beam splitters, beam steerers and lenses. These structures can control and transform impinging waves based on the generalized reflection and refraction law (GSL; generalized Snell's law and generalized reflection law), which states that small phase-shifting elements can control the directions of the reflected and transmitted waves.
    Fri, 22 Feb 2019 09:30:02 EST
  • Freezing upon heating: Formation of dynamical glass

    The discovery of superconductivity and its experimental realization are two of the most important advancements in physics and engineering of the past century. Nevertheless, their statistical and dynamical characteristics have yet to be fully understood. A team of researchers at the Center for Theoretical Physics of Complex Systems, within the Institute for Basic Science (IBS, South Korea), has modeled the energy behavior of chaotic networks of superconducting elements (grains), separated by non-superconducting junctions, and discovered some unexpected statistical properties at long, but still finite time scales. Their findings are published in Physical Review Letters.
    Fri, 22 Feb 2019 08:27:13 EST
  • A tip for future nanoscale sensing

    Commercially-available diamond tips used in atomic force microscopy (AFM) could help make quantum nanoscale sensing cost-effective and practical, A*STAR researchers have found.
    Fri, 22 Feb 2019 08:14:37 EST
  • Researchers watch molecules in a light-triggered catalyst ring 'like an ensemble of bells'

    Photocatalysts – materials that trigger chemical reactions when hit by light – are important in a number of natural and industrial processes, from producing hydrogen for fuel to enabling photosynthesis.
    Fri, 22 Feb 2019 08:06:42 EST
  • Physicists calculate proton's pressure distribution for first time

    Neutron stars are among the densest-known objects in the universe, withstanding pressures so great that one teaspoon of a star's material would equal about 15 times the weight of the moon. Yet as it turns out, protons—the fundamental particles that make up most of the visible matter in the universe—contain even higher pressures.
    Fri, 22 Feb 2019 07:06:30 EST
  • Researchers make coldest quantum gas of molecules

    JILA researchers have made a long-lived, record-cold gas of molecules that follow the wave patterns of quantum mechanics instead of the strictly particle nature of ordinary classical physics. The creation of this gas boosts the odds for advances in fields such as designer chemistry and quantum computing.
    Thu, 21 Feb 2019 14:26:24 EST
  • Quantum dots can spit out clone-like photons

    In the global quest to develop practical computing and communications devices based on the principles of quantum physics, one potentially useful component has proved elusive: a source of individual particles of light with perfectly constant, predictable, and steady characteristics. Now, researchers at MIT and in Switzerland say they have made major steps toward such a single photon source.
    Thu, 21 Feb 2019 14:00:08 EST
  • Physicists get thousands of semiconductor nuclei to do 'quantum dances' in unison

    A team of Cambridge researchers have found a way to control the sea of nuclei in semiconductor quantum dots so they can operate as a quantum memory device.
    Thu, 21 Feb 2019 14:00:03 EST
  • The 'Laminar Express': Engineers dissect the two-seam fastball

    The worlds of engineering and baseball have collided. Researchers at Utah State University are breaking down the physics of a new baseball pitch that's been getting a lot of attention.
    Thu, 21 Feb 2019 12:26:01 EST
  • Do alpha particle condensates exist in oxygen nuclei?

    Nuclei in their lowest energy states (ground state) are composed of neutrons and protons. Two protons and two neutrons in a nucleus can cluster together to form alpha particles. When the nucleus gets nearly enough energy to disintegrate into alpha particles, the alpha particles can arrange themselves in the lowest possible quantum energy level, forming a Bose-Einstein condensate. Examples are the ground state of beryllium-8 and the famous carbon-12 "Hoyle" state, named for Fred Hoyle who first postulated its existence to explain the production of carbon in stars. Could analogous states exist in other isotopes like oxygen-16 and neon-20? Nuclear researchers at Texas A&M University indicated a state analogous to the Hoyle state exists in oxygen-16.
    Thu, 21 Feb 2019 10:10:01 EST
  • A qualitative model to describe microscopic 'jumps' by adhesive tape unwinding from a roll

    A team of researchers from Universite de Lyon and Centre National de la Recherche Scientifique has developed a qualitative model to describe microscopic "jumps" that happen when adhesive tape is unwound from a roll. In their paper published in the journal Physical Review Letters, the group describes their study of the process using high-speed cameras and what they found.
    Thu, 21 Feb 2019 09:40:01 EST
  • Sculpting stable structures in pure liquids

    Oscillating flow and light pulses can be used to create reconfigurable architecture in liquid crystals. Materials scientists can carefully engineer concerted microfluidic flows and localized optothermal fields to achieve control on nucleation , growth and shape of such liquid domains. In comparison, pure liquids in thermodynamic equilibrium are structurally homogeneous. Experimental work based on theory and simulations have shown that if the liquids are maintained in a controlled state of nonequilibrium, the resulting structures can be indefinitely stabilized.
    Thu, 21 Feb 2019 09:30:06 EST
  • How to freeze heat conduction

    Physicists have discovered a new effect, which makes it possible to create excellent thermal insulators which conduct electricity. Such materials can be used to convert waste heat into electrical energy.
    Thu, 21 Feb 2019 09:11:37 EST
  • Water is more homogeneous than expected

    In order to explain the known anomalies in water, some researchers assume that water consists of a mixture of two phases, even under ambient conditions. However, new X-ray spectroscopic analyses at BESSY II, ESRF and Swiss Light Source show that this is not the case. At room temperature and normal pressure, the water molecules form a fluctuating network with an average of 1.74 ± 2.1 percent donor and acceptor hydrogen bridge bonds per molecule each, allowing tetrahedral coordination between close neighbors.
    Thu, 21 Feb 2019 06:46:44 EST
  • Event-based data collection enriches neutron scattering research and new product development

    Scientists using neutron scattering methods to look at the behavior of materials under stress or during phase changes and chemical reactions can view processes from new angles using event-based data. Understanding phase changes and chemical reactions is vital to the design of next-gen consumer products such as better batteries, more powerful electronic devices, cars with improved fuel efficiency, and safer, more effective medical applications.
    Thu, 21 Feb 2019 05:21:46 EST