排序方式: 共有33条查询结果,搜索用时 0 毫秒
31.
N. Yu. Svechnikov V. G. Stankevich K. A. Men’shikov A. M. Lebedev B. N. Kolbasov V. A. Trunova D. Rajarathnam Yu. Kostetski 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2008,2(6):826-835
Microimpurities and charge states of homogeneous deuterated hydrocarbon films redeposited from a T-10 tokamak deuterium plasma discharge are studied spectroscopically using x-ray fluorescence (XRF) analysis, electron paramagnetic resonance (EPR), infrared (IR) spectroscopy; current-voltage (I-V) charachteristics are also measured. Twelve microimpurities (mainly, those of transition metals Fe, Mo, Cr, Ni, Ti, etc., with relative concentrations of 50–7000 ppm) have been discovered. The resulting broad EPR (9.9 GHz, 6000 G) line with g-factors of g = 2.053–2.093 and g = 4.3 assigned to paramagnetic impurities confirms their presence. The presence of different charge states on two sides of the film (one facing the plasma and another facing the vacuum-chamber wall) and the difference in the IR spectra of these states are established. This can be explained by the process of film formation under the influence of the tokamak plasma. 相似文献
32.
Two couples of low pressure multi-wire proportional chambers (MWPC) were located in the target chamber to detect fission fragments in a hypernuclei producing experiment at Thomas Jefferson National Laboratory (Jlab). In the experiment, a continuous wave (CW) electron beam was applied to form hypernuclei by electromagnetic interaction. In the target chamber, the high energy (1.853 GeV) and high intensity (500 nA) primary electron beam caused a high particle background, which influenced the detection of the fission fragments. This report described the design of the MWPCs and studied the fission-fragment detecting performance of them under such a high background. The efficiency of the MWPCs was given with the help of a high resolution kaon spectrometer. At the same time, the background particles were discussed with a Monte Carlo code based on GEANT4. 相似文献
33.
S. V. Volkov E. K. Trunova A. V. Shovkovaya A. O. Gudima 《Russian Journal of Inorganic Chemistry》2012,57(11):1508-1512
Complexation in the Co(II)-phosphonomethylaminosuccinic acid (H4L) system in aqueous solutions at component ratios of 1 : 1 and 1 : 2 and c Co(II) = 1 × 10?2 mol/L was studied by electronic absorption spectroscopy. The formation of various protonated complexes of the general formula Co(H n L) m (OH) q (n = 3?0; m = 1?C2; q = 0?C2) was found, and their stability constants and distribution diagrams were calculated. It was demonstrated that the bis complexes have the structure of a distorted octahedron, and the octahedron ?? tetrahedron rearrangement of the coordination polyhedron occurs in the equimolar complexes at pH > 8. 相似文献