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I. A. Znamenskaya D. F. Latfullin A. E. Lutsky I. V. Mursenkova N. N. Sysoev 《Technical Physics》2007,52(5):546-554
Results are presented from experimental studies of the plasma layer structure of a distributed sliding surface discharge excited in quiescent air and in a uniform gas flow behind a plane shock wave at gas densities of 0.03–0.30 kg/m3. The dynamics of weak shock waves generated after discharge initiation was studied. According to the experimental and simulation results, 40% of the discharge energy transforms into heat within a surface gas layer in the energy input stage, which lasts up to 200 ns. 相似文献
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L. N. Znamenskaya 《Siberian Mathematical Journal》1990,31(4):700-704
Krasnoyarsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 31, No. 4, pp. 202–206, July–August, 1990. 相似文献
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A. I. Egorov L. N. Znamenskaya 《Computational Mathematics and Mathematical Physics》2006,46(6):955-970
The problem of vibration damping in a system described by the set of a wave equation and a second-order ordinary differential equation is considered. The state functions of the system are related through the boundary conditions for the wave equation. 相似文献
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I. A. Znamenskaya I. É. Ivanov I. A. Kryukov T. A. Kuli-Zade 《Journal of Experimental and Theoretical Physics》2002,95(6):1033-1039
The interaction between a pulsed volume discharge with preionization by ultraviolet radiation from plasma sheets and a gasdynamic flow with a known density distribution is studied experimentally. The complex quasi-two-dimensional flow that emerges after the diffraction of a plane shock wave by rectangular obstacles in the channel is experimentally studied and numerically simulated. The glow intensity fields for an unsteady gasdynamic flow are imaged for the first time when recording the plasma radiation from a pulsed discharge in the flow. Since the ionization duration is short (150–200 ns), the gas-flow structure does not change and the flow does not heat up in the glow time of the discharge plasma in the flow. Our images are compared with the reciprocal-density fields of the corresponding two-dimensional gas flow. The effects of gasdynamic structures on the discharge plasma redistribution in the flow are analyzed. The energy contribution is localized into low-density zones (vortices, rarefaction waves) and into regions of density jumps and significant density gradients. The discharge current from adjacent regions with low E/N is redistributed into these zones. Breakdown channels are formed along rarefaction waves, vortices, and discontinuity surfaces between high-electron-density regions. 相似文献
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Upadysheva A. V. Grigor'eva N. D. Znamenskaya A. P. 《Chemistry of Heterocyclic Compounds》1977,13(11):1240-1243
Intramolecular rearrangement of two-ring 2,3-disubstituted 4-oxo-1,2,3,4-tetrahydropyrimidines to pyridine derivatives, which takes place under the influence of polyphosphoric acid, was observed. It is shown that cycloalkanopyrimidones are converted primarily to two- or three-ring 2-pyridones and to small amounts of the corresponding 4-pyridones and 4-aminopyridines. A possible mechanism that enables one to explain the difference in the occurrence of the rearrangements primarily to 2- or 4-pyridones as a function of the absence or presence of aromatic character of the ring condensed with the pyrimidine ring is proposed.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1549–1553, November, 1977. 相似文献
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Doklady Physics - A new method of visualization of the flow-velocity fields within a boundary layer of a nonisothermal fluid using seedless velocimetry is proposed. The method is based on the... 相似文献