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Semiconductors - The phonon modes of quantum-cascade heterostructures based on binary and ternary semiconductor compounds are simulated. The dependences of the frequencies of the structure... 相似文献
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S. A. Dan’ko G. I. Dolgachev A. G. Ushakov 《Instruments and Experimental Techniques》2005,48(3):339-348
The problems of developing bremsstrahlung converters for powerful pulse electron diodes of high-current generators are analyzed. Designs for diode anodes, converter optimization guidelines, and methods for increasing the X-ray yield are discussed. The design of a new converter manufactured from a thin pressed tungsten wire placed between two plates of pyrolyzed graphite is reported. The use of this converter for converting a high-power megavolt pulsed electron beam into bremsstrahlung is described. The converter lifetime is 107 pulses at an average power density of up to 100 W/cm2 and a peak power density of 109 W/cm2. The converter parameters are optimized for various electron energies.__________Translated from Pribory i Tekhnika Eksperimenta, No. 3, 2005, pp. 73–83.Original Russian Text Copyright © 2005 by Dan’ko, Dolgachev, Ushakov. 相似文献
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Isomerization of stilbene photocatalyzed with diphenyldiselenide via a radical mechanism 总被引:1,自引:0,他引:1
The highly efficient process of cis to trans isomerization of stilbene photocatalyzed with diphenyldiselenide inn-hexane solution with quantum yield up to 3500 has been studied. The rate constant of stilbene isomerization catalyzed with PhSe radical, the quantum yield of diphenyldiselenide dissociation and the rate constant of PhSe radicals recombination have been obtained in the temperature region from 288 to 323 K. Oxygen has been found to inhibit the isomerization at high stilbene concentration. 相似文献
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OI Kamaeva VV Sura NN Vinogradova DIu Peskov AA Ushakov TI Ushakova 《Canadian Metallurgical Quarterly》1997,69(11):73-75
The authors have conducted an epidemiological study for multiple myeloma morbidity and mortality among 80,000 patients of the Medical Center examined in 1988-1995. Myeloma was diagnosed in 65 cases. Standard incidence rate was 4.09, 3.18 and 3.5 per 100,000 for myeloma in males, females and both sexes, respectively. Standard mortality was 2.76 and 1.73 per 100,000 for males and females, respectively. The above rates do not differ much from those of other countries. In terminal myeloma renal insufficiency occurred in 39 of 41 cases. In 8 cases chronic pyelonephritis was an independent course of renal failure thus indicating the importance of its persistent treatment. 相似文献
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V. G. Ushakov E. I. Fandeev A. G. Tkachenko V. A. Kozlov Yu. L. Klokov 《Fibre Chemistry》1971,1(5):560-563
Conclusions 1. Stabilization of the temperature at the surface of dryer cylinders heated by saturated steam over a range above 95°C can be effected by controlling the steam pressure.2. Where it is required to maintain the temperature of a dryer cylinder in a range below 95°C, a temperature sensing device must be incorporated in any automatic control system.3. An automatic control system, incorporating a temperature sensor which does not make contact with the surface, can enable the temperature of a dryer cylinder to be maintained within ±3°C over a range of 60–110°C.Novocherkassk Polytechnic Institute. All-Union Research Institute for Synthetic Fibres (VNIIV). Translated from Khimicheskie Volokna, No. 5, pp. 57–59, September–October, 1969. 相似文献