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排序方式: 共有705条查询结果,搜索用时 328 毫秒
1.
Kovchavtsev A. P. Aksenov M. S. Nastov’yak A. E. Valisheva N. A. Gorshkov D. V. Sidorov G. Yu. Dmitriev D. V. 《Technical Physics Letters》2020,46(5):469-472
Technical Physics Letters - The C–V characteristics of Au/Al2O3/In0.52Al0.48As and Au/SiO2/In0.52Al0.48As metal–insulator–semiconductor structures have been studied. It has been... 相似文献
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Radiochemistry - Reaction of solid-phase catalytic heterogeneous isotope exchange of 2-deoxy-D-glucose and its derivative, O(6)-(4-bromothiophenyl)guanine-C8-β-D-glucose with tritium has been... 相似文献
3.
O. P. Mikheeva A. I. Sidorov A. S. Khaiikina E. V. Chuguevets 《Technical Physics Letters》2002,28(1):48-49
Experimental data on the pulsed laser radiation confinement in compensated GaAs and ZnSe with deep impurity levels are reported for the laser wavelength λ=1.55 μm and a pulse repetition frequency of up to 100 kHz. It is demonstrated that an increase in the pulse repetition rate is accompanied by a decrease in the energy confinement threshold and by an increase in the radiation attenuation coefficient. These effects are explained by the accumulation of nonequilibrium charge carriers related to a dependence of the recombination time constant on the concentration of free impurity centers. 相似文献
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The following modes of isotope exchange of azidothymidine (3'-azido-3'-deoxythymidine) with tritium were studied: solid- and liquid-phase isotope exchange with gaseous tritium and isotope exchange in solution with tritium water. Catalytic reactions of azidothymidine with gaseous tritium in solution result in virtually complete reduction of the azido group to amino group. This reduction also occurs in the course of solid-phase catalytic hydrogenation; the yield of 3'-amino-3'-deoxythymidine ranges from 20 to 70%. The molar radioactivity of tritium-labeled azidothymidine prepared by solid-phase catalytic isotope exchange with gaseous tritium and by isotope exchange in solution with tritium water does not exceed 0.5 Ci mmol-
1. 相似文献
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L. A. Dombrovskii L. I. Zaichik Yu. A. Zeigarnik E. S. Mukhtarov A. S. Sidorov 《Thermal Engineering》2006,53(4):302-306
Quasi-steady-state thermal conditions of the corium bath found on a reactor vessel bottom is considered. Using approximate heat transfer models proposed earlier, a conjugate problem is solved with taking into account radiation heat transfer in the space above the bath surface. The results of calculations of heat flow-rates from the corium bath to the VVER-440 reactor vessel are presented. It is shown that water delivery to the bath surface leads to an essential decrease in the heat flowrate towards the wall in the most dangerous area, where a layer of melted steel contacts the reactor vessel, and retains a possibility of keeping the melt inside the reactor vessel under external cooling. 相似文献
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S.?A.?Dvoretskii A.?P.?Kovchavtsev I.?I.?LeeEmail author V.?G.?Polovinkin G.?Yu.?Sidorov M.?V.?Yakushev 《Optoelectronics, Instrumentation and Data Processing》2018,54(6):569-575
Modern designs of time delay and integration (TDI) IR linear scanning focal plane arrays (IR FPAs) are analyzed. Advanced designs of linear IR FPAs with increased sensitivity and spatial resolution are proposed. The analysis is based on Monte-Carlo simulation of the diffusion of photogenerated charge carriers in photodiode arrays based on mercury–cadmium–telluride epitaxial layers taking into account the main photoelectric and design parameters of the detectors and optical system. 相似文献
10.
Reaction between α-V2O5 and NaN3 has been studied at pressures from 5.0 to 6.0 GPa and temperatures from 600 to 800°C using Toroid high-pressure chambers. A new oxide, V3.047O7 (VO2.297), isostructural with simpsonite, Al4Ta3O13(OH), has been detected in samples with the initial composition 0.2NaN3 · V2O5 after high-temperature, high-pressure processing at p = 5.0 GPa and t = 800°C for 2 min. The crystal structure of the oxide has been refined by the Rietveld method using X-ray powder diffraction data: a = 7.35136(2) Å, c = 4.51462(2) Å, V = 211.294(1) Å3, Z = 2, sp. gr. P3. Each vanadium atom in this structure is coordinated by six oxygens in the form of a [VO6] octahedron. The synthesized oxide is a second compound with the simpsonite structure. We have measured the infrared transmission and Raman spectra of V3.047O7. Electrical measurements have demonstrated that the material is a semiconductor. 相似文献