Scientists at the University of Nottingham have successfully levitated diamond and some of the heaviest elements, including lead and platinum. Using liquid oxygen to increase the buoyancy created by a specially designed superconducting magnet, they could now levitate a hypothetical object with a density 15 times larger than that of the densest known material, osmium. This research is published today (11th May 2005) in the New Journal of Physics co-owned by the Institute of Physics and Deutsche Physikalische Gesellschaft (the German Physical Society).
Writing in the New Journal of Physics, the team led by Professor Laurence Eaves and Professor Peter King, describes for the first time how mixtures of oxygen and nitrogen in the liquid and gaseous states provide sufficient buoyancy to levitate a wide variety of objects including diamonds, a £1 coin, and heavy metals such as gold, silver, lead and platinum.
Some materials, called diamagnetic, tend to become magnetized in a direction opposite to the magnetic field being applied to them. Magnetic levitation occurs when the force on such an object is strong enough to balance the weight of the object itself. If the object is immersed in a fluid such as gaseous oxygen, the levitation can be enhanced by the effect of buoyancy caused by the "magneto-Archimedes" effect.
David Reid | EurekAlert!
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Subaru Telescope helps pinpoint origin of ultra-high energy neutrino
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For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.
Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...
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