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排序方式: 共有177条查询结果,搜索用时 15 毫秒
1.
L. G. Gerchikov Yu. A. Mamaev A. V. Subashiev Yu. P. Yashin D. A. Vasil’ev V. V. Kuz’michev A. E. Zhukov E. S. Semenova A. P. Vasil’ev V. M. Ustinov 《Semiconductors》2006,40(11):1326-1332
Photoemission of polarized electrons from heterostructures based on InAlGaAs/GaAs superlattices with minimum conduction-band offsets is investigated. The comparison of the excitation energy dependence of the photoemission polarization degree with the calculated spectra make it possible to determine the polarization losses at different stages of the photoemission. A maximum polarization of P = 91% and a quantum yield of 0.14% are close to the best results obtained for photocathodes on the basis of strained semiconductor superlattices. 相似文献
2.
3.
P. P. Boldyrev A. V. Kurochkin M. A. Proshin D. Yu. Chuvilin Yu. A. Yashin 《Radiochemistry》2016,58(5):498-505
A cell for isolating 177Lu from a neutron-irradiated 176Yb target was developed. The procedure involves a combination of two processes: contact reduction of Yb from acetate–chloride solution on sodium amalgam, followed by electrolysis of the solution on a mercury cathode. The process conditions were chosen so that the adjustment of the working solution characteristics (composition, pH, etc.) in going from contact reduction to electrolysis was not required. Both processes are performed in one cell, which reduces the 177Lu loss. On an installation consisting of two cells, the decontamination factor of the 177Lu solution from Yb of up to 106 was reached, which is necessary for obtaining a 177Lu preparation of high specific activity. 相似文献
4.
Andrey N. Agafonov Boris O. Volodkin Denis G. Kachalov Boris A. Knyazev Grigory I. Kropotov Konstantin N. Tukmakov 《Journal of Modern Optics》2013,60(11):1051-1054
AbstractWe demonstrate results of studies of a silicon binary diffractive optical element (DOE) focusing a terahertz laser Gaussian beam into a paraxial segment. The characteristics of the DOE were examined on a Novosibirsk Free Electron Laser beam of 141-μm wavelength. 相似文献
5.
利用太赫兹时域光谱技术测量了掺硫硒化镓(GaSe1-xSx)晶体在太赫兹波段的光学参数,包括折射系数、吸收系数等.使用自由空间电光取样法获得了太赫兹电磁波的脉冲波形.对不同硫掺杂量的硒化镓晶体进行了研究,在硫的掺杂量为0,0.01,0.14,0.26,0.37时,在0.2-2.0THz测得了GaSe1.S.的折射系数、... 相似文献
6.
Experiments on measuring the water velocity in the gaps between the fuel elements of an IRT-3M eight-tube fuel assembly with
90% fuel enrichment, used in pool and tank research reactors, are described. The experiments were performed on a hydraulic
facility at the National Research Center Kurchatov Institute. The velocity was determined from the dynamic head in the gaps
of a model fuel assembly. These velocities were used as a basis for determining the water flow rate in each gap and the total
flow rate through a fuel assembly. Comparative hydraulic calculations of IRT-3M fuel assemblies with 90% fuel enrichment and
IRT-4M fuel assemblies with 19.7% enrichment, developed as a replacement for IRT-3M, are described. It is shown that if the
IRT-4M gaps decrease to 1.85 mm, then the water velocity in them will decrease by only 5% as compared with IRT-3M. 相似文献
7.
A. F. Iyudin V. V. Bogomolov S. I. Svertilov I. V. Yashin G. F. Smoot III J. Greiner A. fon Kienlin 《Instruments and Experimental Techniques》2013,56(6):640-648
The energy resolution of different-geometry LaBr3:Ce and CeBr3 scintillation crystals grown by the Institute of Solid State Physics (Russian Academy of Sciences) by the order of the Skobel’tsyn Institute of Nuclear Physics (Moscow State University) was measured. The measurements were taken at energies of detected γ rays ranging from 20 keV to ~5 MeV. The samples under investigation were shaped as cylinders with a diameter of 0.5 cm and heights of 1.5 and 3.0 cm. The positional resolution along the crystal axis was also investigated for the CeBr3 crystals by measuring the amplitudes of the scintillation signals from the opposite crystal ends. It was shown that the ratio of these amplitudes was dependent on the distance from a crystal end surface to the interaction point of a γ quantum inside the detector according to the linear law. The positional resolution along the crystal length appeared to be comparable to the crystal diameter. The results of the study suggest that CeBr3 crystals have a great potential as position-sensitive elements of space-sensitive detectors for high-energy charge particles and γ rays. 相似文献
8.
Production processes are evaluated on the basis of statistical process control (SPC) in order to ensure that cold-rolled strip
made from 65Γ steel corresponding to Technical Specifications TU 14-4-1382-86 complies with the ISO/TU 16949:2002 standard.
The statistical applicability and degree of controllability of SPC are determined, and corrections are introduced in the technology. 相似文献
9.
The method of simulation modeling was used to perform a comparative analysis of the characteristics of a number of agreement criteria under conditions of restricted sampling. A method is proposed for modifying the 2 criterion for the purpose of broadening its range of application. 相似文献
10.