Physics

X-ray 'prism' explores chemical changes at the molecular scale

(Phys.org)—Research at SLAC National Accelerator Laboratory demonstrates that ultrashort, ultrabright X-ray laser pulses can reveal details of chemically important molecules at room temperature and in their natural state. The technique could aid studies of photosynthesis and industrial catalysts, and opens the door to development of other analytic tools at SLAC's Linac Coherent Light Source.

Laser the size of a virus particle: Miniature laser operates at room temperature and defies the diffraction limit of light

A research team has found a way to manufacture single laser devices that are the size of a virus particle and that operate at room temperature. These plasmonic nanolasers could be readily integrated into silicon-based photonic devices, all-optical circuits and nanoscale biosensors.<img src="http://feeds.feedburner.com/~r/sciencedaily/matter_energy/physics/~4/H36... height="1" width="1"/>

South Pole Telescope and CMB Constraints | Cosmic Variance

<p>The <a rel="nofollow" target="_blank" href="http://pole.uchicago.edu/">South Pole Telescope</a> is a wonderful instrument, a ten-meter radio telescope that has been operating at the South Pole since 2007.

Electron microscopes with a twist

Vortex beams, rotating like a tornado, offer completely new possibilities for electron microscopy. A method of producing extremely intense vortex beams has been discovered at the Vienna University of Technology (TU Vienna).

Crystals for efficient refrigeration

(Phys.org)—Researchers at the Carnegie Institution have discovered a new efficient way to pump heat using crystals. The crystals can pump or extract heat, even on the nanoscale, so they could be used on computer chips to prevent overheating or even meltdown, which is currently a major limit to higher computer speeds. The research is published in the Physical Review Letters.

Physicists use Kinect to control holographic tweezers (w/ Video)

(Phys.org)—Researchers at the University of Dundee in Scotland have devised a means of using a Microsoft Kinect sensing system to allow for hand control of holographic optical tweezers. They describe their results in a paper they've uploaded to the preprint server arXiv.

Electron microscopes with a twist: Vortex beams, rotating like a tornado, offer new possibilities for electron microscopy

Vortex beams, rotating like a tornado, offer completely new possibilities for electron microscopy.  A method of producing extremely intense vortex beams has been discovered.<img src="http://feeds.feedburner.com/~r/sciencedaily/matter_energy/physics/~4/0x-... height="1" width="1"/>

Precision measurements using top quarks at CMS

Amongst all known elementary particles, the top quark is peculiar: weighing as much as a Tungsten atom, it completes the so-called 3rd generation of quarks and is the only quark whose properties can be directly measured. Owing to its mass, the top quark is unstable and, in CMS, decays much before it can interact with the proton remnants through the strong interaction and form hadrons (the bound states of quarks).

The Excitement Grows! | Cosmic Variance

<p>We made a little video to promote <a rel="nofollow" target="_blank" href="http://www.amazon.com/The-Particle-End-Universe-Higgs/dp/0525953590/"><e... Particle at the End of the Universe</em></a>. November 13, next Tuesday, is the official release date. (Although I suppose there&#8217;s nothing that strictly prevents you from ordering it now.)</p>

Giving fluorescence microscopy new power to study cellular transport

(Phys.org)—The ability of fluorescence microscopy to study labeled structures like cells has now been empowered to deliver greater spatial and temporal resolutions that were not possible before, thanks to a new method developed by University of Illinois researcher Gabriel Popescu and Ru Wang from his lab. Using this method, they were able to study the critical process of cell transport dynamics at multiple spatial and temporal scales and reveal, for the first time, properties of diffusive and directed motion transport in living cells.

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