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排序方式: 共有121条查询结果,搜索用时 15 毫秒
41.
Rogachev S. O. Naumova E. A. Karelin R. D. Andreev V. A. Perkas M. M. Yusupov V. S. Khatkevich V. M. 《Russian Journal of Non-Ferrous Metals》2021,62(3):293-301
Russian Journal of Non-Ferrous Metals - Recently developed multicomponent eutectic alloys based on Al–Ca are promising for practical application, since they are characterized by low density... 相似文献
42.
A. I. Karelin R. R. Kayumov E. A. Sanginov Yu. A. Dobrovolsky 《Petroleum Chemistry》2016,56(11):1020-1026
The products of solvation of lithiated Nafion with dimethylsulfoxide (DMSO) have been studied by ATR IR spectroscopy in the frequency range of 50–4000 cm–1 in a vacuum at room temperature. Degree of solvation n = DMSO/Li has been varied in a range of 1.5–18.4. Based on analysis of the dependence of the spectral parameters on the n value, it has been concluded that the test samples contain DMSO molecules of two types. The first type includes molecules coordinated to the lithium ion through the formation of the metal–oxygen bond, and the second is DMSO molecules associated by intermolecular bonds similar to those in the liquid DMSO phase. The structure of the salt depends on n: the changes are attributed to the reorientation of polymer chain units. The coordination number of lithium has been estimated at four. It has been shown that the IR data are consistent with the data on the conductivity of lithiated Nafion membranes as a function of DMSO content, according to which the simplest transport unit is the tetrasolvate [Li(DMSO)4]+. At temperatures below 0°C, all the samples exhibit an abrupt change in conductivity, which is attributed to the freezing of DMSO in the membrane matrix. 相似文献
43.
I. Yu. Khmelevskaya R. D. Karelin S. D. Prokoshkin V. A. Andreev V. S. Yusupov M. M. Perkas V. V. Prosvirnin A. E. Shelest V. S. Komarov 《The Physics of Metals and Metallography》2017,118(3):279-287
The effect of severe plastic deformation by equal-channel angular pressing (ECAP) under normal and quasi-continuous regimes on the structure and the mechanical and functional properties of a Ti–50.2 at % Ni shape-memory alloy (SMA) has been studied. ECAP was carried out at an angle of intersection of channels of 120° in the normal regime with heating between passes at 450°C for 20 passes and in the quasi-continuous regime at the temperature of 400°C for three, five, and seven passes. The hot screw rolling with subsequent annealing at 750°C for 30 min and cooling in water was used as a control treatment (CT). A mixed submicrocrystalline and nanosubgrained structure was formed. The increase in the number of passes from three to seven led to a decrease in the average size of structural elements from 115 ± 5 to 103 ± 5 nm and to an increase in the fraction of grains/subgrains having a size less than 100 nm. After ECAP (seven passes) and post-deformation annealing at the temperature of 400°C for 1 h, a completely recoverable strain was 9.5%; after normal ECAP, 7.2%; after CT, 4.0%. 相似文献
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48.
M. M. Ivanov V. I. Karelin V. V. Gorokhov V. A. Chernyshov I. V. Filatov M. A. Ignatov P. A. Tsitsilin A. M. Sokolov N. M. Galina V. I. Yudanov 《Instruments and Experimental Techniques》2016,59(1):136-138
Results of designing of a sectioned metal oxide hot cathode with indirect heating and a total emission coating area of 100 cm2 are described. The design of the hot cathode enables control of the working surface temperature and allows one to change emission surface without replacing the whole hot cathode. The thermal test results are presented. The possibility is shown of applying the hot cathode in the uncharacteristic mode of gas discharge formation in medium vacuum conditions. 相似文献
49.
M. D. Andriichuk V. R. Belinskii-Slotilo I. V. Ivanchenko S. Yu. Karelin V. N. Makogonenko S. Yu. Paranchich L. D. Paranchich V. R. Romanyuk N. A. Popenko V. N. Tkach 《Inorganic Materials》2009,45(11):1230-1233
Cr
x
Hg1 − x
crystals grown by solid-state recrystallization have been characterized by electron paramagnetic resonance spectroscopy,
transport measurements, and X-ray microanalysis. The results demonstrate that the crystals contain rectangular HgCr2Se4 inclusions elongated along one of their axes and irregularly shaped Cr
x
Hg1 − x
and CrHg inclusions. In the range 77–400 K, the electrical properties of samples cut from different parts of the crystals
are typical of semiconductors with a strongly degenerate electron gas. 相似文献
50.