- Mobile radiant energy sterilizer
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A portable, radiation-producing apparatus is provided that can produce highly energetic electron beam radiation and X-rays from a low voltage power source., e.g., a battery. The radiation-producing apparatus is comprised of a radiation generating device, a pulsed high voltage generator and a control system. The pulsed high voltage generator is comprised of a power source and a Tesla resonant transformer. The Tesla resonant transformer has at least one first capacitor, a primary coil, a secondary coil and at least one second capacitor. The at least one second capacitor is disposed axially within the secondary coil. The pulsed high voltage generator is connected to the radiation generating device for providing electrical energy to the radiation generating device. The control system is connected to the pulsed high voltage generator for selectively controlling the transfer of energy from the pulsed high voltage generator to the radiation generating device. The radiation-producing apparatus generates pulses of electrons and X-rays. Each pulse has a time duration of about 100 nanoseconds or less. The electrons and X-rays produced by the radiation-producing apparatus can be used to deactivate microbial contamination or irradiate various materials.
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- Etude du comportement thermique et de la chaleur specifique du tetrahydruroberyllate de dilithium Li2BeH4
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The thermal behavior of dilithium-tetrahydridoberyllate Li2BeH4 has been studied up to 825 K by simultaneous DSC-TGA measurements. A solid-solid transition between the hexagonal phenakite form (Be2SiO4) previously described and a possible high-temperature cubic form (Li2SO4-HT) occurs at 536±2 K. In addition the thermal decomposition has been characterized by measuring the mass of gas released during heating up to 1075 K. Two distinct steps in the temperature ranges 545-575 K and 905-935 K indicate a total loss of two moles of hydrogen per mole of hydride. The variation of specific heat against temperature has been measured in the 180-420 K range by differential microcalorimetry. A weak but reproducible and reversible anomaly can be detected in the 320-350 K range. This anomaly is marked by a change in the slope of the Cp vs. T curve. The change in the slope clearly corresponds to a maximum in the vicinity of 340 K on the Cp/T vs T representation. This thermodynamic behavior could be interpreted as a superconductivity criterion when correlated with magnetic irreversibilities previously observed for the same compound. Thus, LiBe2H4 could appear like a type-II superconductor with a critical temperature Tc=(340±10) K. However this remarkable potential property requires resistivity measurements to be definitely established.
- Contreras,Lucas,Letoffe,Bastide,Bouamrane,Diot,Claudy
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- Thermal Stability and Phase Studies of LiH + BeH2 System
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Phase studies were made of isothermally annealed material using a wide angle rotating anode diffractometer.The primary compositions studied were 1:1 and 2:1 of LiH:BeH2 where the 1:1 gave LiBeH3 and the 2:1 gave Li2BeH4.The thermal stability studies were made up to 425 deg C by annealing in carefully controlled atmosphere reactors.These samples are stable long enough to obtain data without evidence of reaction.The BeH2 used was that prepared by Ethyl Corp. /8,9/ and is believed to be relatively unchanged.
- Cantrell, J. S.,Beiter, T. A.,Souers, P. C.,Barry, P.
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p. 233 - 238
(2007/10/02)
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- Kinetics of the Carbothermal Reduction of Subgroup IIA Oxides
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The reduction by carbon of solid oxides of type-analogue elements of subgroup IIA involves CO as a reducing agent, with formation of vapour of the reduced metal and CO2.The carbon regenerates the CO and forms carbides of the metals.For the oxides CaO, SrO, BaO (of shell-analogue elements) we have established a general correlation between the rate of the reaction and the Gibbs free energy of the reduction by carbon to the vapour of the metal.
- Vodop'yanov, A. G.
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p. 1621 - 1624
(2007/10/02)
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