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K Temperature (k + temperature)

Distribution by Scientific Domains
Physics and Astronomy75%

Terms modified by K Temperature

  • k temperature range
    		•

    Selected Abstracts

    ChemInform Abstract: Unhydrated Cr(V) Peroxychromates M3CrO8 (M: Na, K, Rb): Low-Dimensional Antiferromagnets Exhibiting Large Specific Heats at mK to 5 K Temperatures.

    CHEMINFORM, Issue 28 2001
    Brant Cage
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    Actively Q-switched, diode pumped thulium laser

    LASER PHYSICS LETTERS, Issue 12 2007
    J.K. Jabczynski
    Abstract 6 W of output power and near 50% slope efficiency with respect to absorbed pump power was demonstrated in freerunning mode for a short, 40-mm long resonator. The uncoated, with 3.5% dopant of thulium YLF rod of.3× 8 mm size wrapped with indium foil was mounted in copper heat-sink maintaining 293 K temperature of coolant water and inserted in a short, 40-mm long resonator. For pumping the fiber coupled (0.4 mm core diameter) laser diode bar at 792-nm wavelength was deployed. The fused silica acousto-optic modulator with above 80% diffraction efficiency for 25-W power of RF was taken as the Q-switch for such a laser. In the best case of Qswitching mode up to 2-mJ output energy with 20-ns pulse duration corresponding to 100-kW peak power was demonstrated for rep. rate of a few Hz. Emission wavelength was around 1904 nm for both free-running and Q-switching regimes. (© 2007 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

    The dust-free symbiotic Mira K4,46 = LL Cas

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Issue 2 2010
    U. Munari
    ABSTRACT Accurate BVRCIC light and colour curves of the Mira variable in the dust-free symbiotic system K4,46 are presented and discussed. They cover several consecutive pulsations cycles. The Mira mean period is 284.2 d, the reddening sums to E(B,V) = 0.35 and the distance is 10 kpc. Absolute spectrophotometry at both maximum and minimum brightness of the Mira is presented. The rich emission line and continuum spectrum of the H ii region ionized by the hard radiation of the white dwarf dominates at Mira minimum. From its photoionization analysis, it is found that the H ii region extends to a radius of 210 au, has a mass 1.8 × 10,4 M, and it is ionized by a white dwarf of 158 000 K temperature and 0.06 R, radius, stably burning hydrogen at its surface. The derived [Fe/H]=,0.45 well match the ambient metallicity expected at K4,46 at its 15 kpc galactocentric distance, and the overabundances in N, Ne and He are those expected if the H ii region is fed by the wind of the Mira and polluted by nuclearly processed material lost by the white dwarf companion. [source]

    Study of the influence of ,-particles irradiation on AlGaAs/GaAs heterojunction structures

    PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 12 2008
    P. Georgakakos
    Abstract Aim of the present work is to study the influence of the radiation of ,-particles (5 MeV) in Schottky diodes on CaAs/AlGaAs/GaAs heterojunction structures. The investigation was performed by means of current-voltage and capacitance-voltage characteristics in 300 K temperature. The dependence of ideality factor, barrier height, carrier concentration and series resistance as a function of radiation fluence was determined. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]