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41.
In the present paper, we analyze emergency situations typical of short-duration wind tunnels with electric-arc or combined test-gas heating in the presence of stabilization and diaphragm-rupturing systems, which occur in the case of no discharge initiation in the settling chamber, with the capacitor battery having remained charged during the start of wind-tunnel systems. For avoiding such emergency situations, some additional changes based on using feedback elements are introduced into the wind-tunnel design: the piston of the fast-response valve is made hollow for increasing the volume of the shutoff cavity and for making the release of pressure from this cavity unnecessary; the high-pressure channel, which connects the piston and the piston rod with the settling-chamber cavity, is filled with a liquid and is closed from the side of the settling chamber with a piston; the device for controlled diaphragm breakdown is provided with an external electric circuit intended to control the diaphragm-rupturing process. Those modifications allow subsequent functioning of the wind-tunnel systems only in the presence of heat-supply-induced pressure growth in the settling chamber of the wind tunnel. 相似文献
42.
Kapaev Roman Chekannikov Andrey Novikova Svetlana Yaroslavtsev Sergey Kulova Tatiana Rusakov Vyacheslav Skundin Alexander Yaroslavtsev Andrey 《Journal of Solid State Electrochemistry》2017,21(8):2373-2380
Journal of Solid State Electrochemistry - In order to satisfy a growing demand for energy storage devices and to create safer and less expensive batteries with high capacity, materials based on... 相似文献
43.
I. Yu. Pinus A. E. Baranchikov A. G. Veresov A. B. Yaroslavtsev 《Russian Journal of Inorganic Chemistry》2008,53(8):1163-1166
We compare ionic conductivity in zirconium hydrogen phosphate samples with NASICON structure prepared by various methods. Hydrothermal and hydrothermal/ultrasonic treatment reduces the crystallite size and increases ionic conductivity in HZr2(PO4)3 · nH2O samples at low temperatures. At high temperatures, the conductivity of the anhydrous phase HZr2(PO4)3 is higher in the material prepared by ion exchange. Ultrasonication does not considerably improve the properties of hydrothermally prepared samples. 相似文献
44.
D. V. Safronov I. A. Stenina A. V. Maksimychev S. L. Shestakov A. B. Yaroslavtsev 《Russian Journal of Inorganic Chemistry》2009,54(11):1697-1703
NASICON materials of composition Li1 + x
Zr2 − x
In
x
(PO4)3(x = 0–1) were synthesized. The phase constitution, particle size, and conductivity of these materials were studied as s function
of synthesis temperature. High-temperature X-ray powder diffraction was used to study phase transitions in the materials synthesized.
Low levels (x ≤ 0.1) partial substitution of indium for zirconium considerably increase the lithium ion conductivity and reduce the activation
energy for conduction compared to the parent compound. 相似文献
45.
D. I. Bronin B. L. Kuzin I. Yu. Yaroslavtsev N. M. Bogdanovich 《Journal of Solid State Electrochemistry》2006,10(8):651-658
The electrochemical cells with electrodes based on La0.8Sr0.2MnO3 (LSM) and supporting solid electrolytes La0.88Sr0.12Ga0.82Mg0.18O2.85 (LSGM) and Ce0.80Sm0.20O1.90 (SDC) were studied comparatively. Characteristics of LSM electrodes and composite electrodes comprising a mixture of LSM
and electrolytes of different origins [LSGM, SDC, and Zr0.82Sc0.18O1.91 (SSZ) in the mass ratio of 1:1] were analyzed. It was shown that: 1) the electrode polarization conductivity and the ohmic
resistance of the cells with the LSM–LSGM composite electrodes on the LSGM and SDC electrolytes had very similar values, while
they were largely different from all the other electrodes, 2) the electrochemical activity of the electrodes on the SDC electrolyte
was much higher than on the LSGM electrolyte, and 3) the ohmic resistance of the cells with the SDC electrolyte corresponded
to the electrolyte resistance, whereas, the ohmic resistance of the cells with the LSGM electrolyte was much larger than the
electrolyte resistance. The obtained results are due to the interaction between the LSM and LSM-containing electrodes with
the LSGM electrolyte during sintering, leading to the formation of a product with a very low conductivity. 相似文献
46.
V. G. Ponomareva V. A. Tarnopol’skii A. B. Yaroslavtsev 《Russian Journal of Inorganic Chemistry》2006,51(3):343-346
The composite electrolytes of composition (1 ? x)TaH(PO4)2 · 2H2O/xSiO2 (x = 0.2–0.4) are synthesized, and their transport properties are characterized over a wide temperature range. Doping with highly dispersed silica only insignificantly changes the proton conductivity of tantalum hydrogenphosphate below 370 K; above 820 K, the conductivity increases. The evolution of the phase composition of TaH(PO4)2 · 2H2O and its base materials during thermolysis is studied. 相似文献
47.
48.
A. S. Shalimov S. A. Novikova I. A. Stenina A. B. Yaroslavtsev 《Russian Journal of Inorganic Chemistry》2006,51(5):700-705
An MF-4SK cation-exchange membrane has been modified to obtain composite materials containing acid zirconium phosphate particles. It is demonstrated by electron microscopy and X-ray diffraction that acid zirconium phosphate in the resulting membrane is in the crystalline state. As compared to the initial MF-4SK membrane, the modified membrane shows a somewhat lower diffusion permeability and a higher ion selectivity. 相似文献
49.
I.?Yu.?Yaroslavtsev B.?L.?Kuzin D.?I.?BroninEmail author N.?M.?Bogdanovich 《Russian Journal of Electrochemistry》2005,41(5):527-531
For two types of electrochemical cells with oxygen-conducting solid electrolytes based on lanthanum gallate (LSGM) and cerium oxide (SDC) studied are the temperature dependences of the polarization conductivity of air electrodes prepared from lanthanum-strontium manganite (LSM) and composites LSM-LSGM, LSM-SDC, and LSM-SSZ (SSZ is zirconium dioxide-based electrolyte). Effect of praseodymium oxide, added into these electrodes as a modifier, on their electrochemical properties is examined. Electrochemical systems with an LSM/LSGM interface exhibit low electrochemical activity toward the oxygen reaction, because during the formation of electrodes, LSM interacts with LSGM to form a poorly conducting product.__________Translated from Elektrokhimiya, Vol. 41, No. 5, 2005, pp. 602–606.Original Russian Text Copyright © 2005 by Yaroslavtsev, Kuzin, Bronin, Bogdanovich. 相似文献
50.