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1.
Zmushko V. V. Razin A. N. Sinelnikova A. A. 《Journal of Applied Mechanics and Technical Physics》2022,63(3):400-407
Journal of Applied Mechanics and Technical Physics - Turbulent mixing at interfaces of three-layer gas systems after shock-wave passage has been studied. The influence of the initial roughness of... 相似文献
2.
A. V. Razin 《Radiophysics and Quantum Electronics》1997,40(4):274-282
Using the contour integration method, we solved the problem on the transient radiation of acoustic waves by a mass-production
source which moves uniformly in a gas in the direction normal to the interface of homogeneous gaseous and elastic half-spaces
and vanishes at the moment of the solid surface contact. Asymptotic formulas are derived for the transient radiation field
which are valid at the fronts of spherical and lateral waves. An exact analytical expression is obtained for the transient
radiation field at observation points in the source trajectory. The total internal reflection effects in the transient radiation
of sound are analyzed.
Radiophysical Research Institute, Nizhny Novgorod, Russia. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika,
Vol. 40, No. 4, pp. 420–431, April, 1997. 相似文献
3.
A. V. Vodopyanov S. V. Golubev V. G. Zorin S. V. Razin A. V. Sidorov V. A. Skalyga A. G. Shalashov 《Radiophysics and Quantum Electronics》2003,46(8-9):737-743
We demonstrate experimentally the possibility to create and sustain a strongly ionized plasma at low gas pressures by the electromagnetic radiation of the intensity which is below the conventional breakdown level. The conditions of ignition and sustaining the plasma are found, and the plasma parameters are measured. The necessary condition for the discharge formation is strong preliminary ionization of an initial gas. Significant electron heating in the RF field, which ensures the effective gas ionization takes place due to Coulomb collisions with protoplasma ions. Such collisions are much more frequent than the electron-neutral collisions. We propose a qualitative analytical model of the discharge evolution, which describes the effects observed. 相似文献
4.
We describe shaper cavities for the production of ultrashort microwave pulses with a minimum duration of one period of the high-frequency field and a power of several tens of megawatts. Experimental results are presented.Scientific and Research Insititute for Nuclear Physics at S. M. Kirov Polytechnical Institute, Tomsk. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 38, No. 12, pp. 1250–1256, December, 1995. 相似文献
5.
Razin V. V. Ulin N. V. Raev V. A. Zadonskaya N. Yu. Zuev D. S. 《Russian Journal of Organic Chemistry》2003,39(1):40-48
The anti-Markownikoff products of bromination and bromomethoxylation of 3-methylenecyclobutane-1-carbonitrile and methyl 3-methylenecyclobutane-1-carboxylate were subjected to dehydrobromination by the action of potassium tert-butoxide in THF. The reaction takes two elimination pathways: 1,3-dehydrobromination to give bicyclobutane derivatives and 1,2-dehydrobromination leading to substituted methylenecyclobutane. Structural factors in the substrate were revealed, which are responsible for the ratio of the two concurrent elimination processes. 相似文献
6.
V. V. Razin M. E. Yakovlev K. V. Shataev S. I. Selivanov 《Russian Journal of Organic Chemistry》2004,40(7):1027-1032
A three-step procedure has been developed for the synthesis of 3,5-disubstituted methyl pyridazine-4-carboxylates from accessible 2,3-disubstituted 2-cyclopropenecarboxylates. In the first step, cyclopropene derivatives react with diazomethane to give adducts having 2,3-diazabicyclo[3.1.1]hex-2-ene structure. The regio- and stereoselectivity of the cycloaddition has been determined. The second step is isomerization of the bicyclic adducts into 1,4-dihydropyridazine derivatives by the action of sodium methoxide. Finally, oxidation with potassium permanganate yields the target pyridazine-4-carboxylates. 相似文献
7.
8.
V. A. Vasin I. Yu. Bolusheva V. A. Kalyazin V. V. Razin 《Russian Journal of Organic Chemistry》2014,50(10):1448-1455
Benzyl, methyl, and phenyl α-bromovinyl sulfones reacted with malononitrile and dimethyl malonate sodium enolates in THF to give sulfonyl-substituted cyclopropanes. Reactions of the same sulfones with methyl acetoacetate sodium enolate afforded the corresponding sulfonyl-substituted cyclopropanes as mixtures of cis and trans isomers with a small impurity of 5-sulfonyl-4,5-dihydrofuran derivative. Phenyl and p-tolyl 1-bromo-2-phenylvinyl sulfones reacted with methyl acetoacetate sodium salt to produce a mixture of trans-isomeric 5-sulfonyl-4,5-dihydrofuran and Michael adduct of the CH acid with activated acetylene generated by concurrent 1,2-dehydrobromination of the initial α-bromovinyl sulfone. 相似文献
9.
Yu. Zanevsky V. Belyakov V. Chepurnov S. Chernenko O. Fateev Yu. Krasnov A. Moskovsky S. Razin N. Scherbakov A. Zubarev 《Physics of Particles and Nuclei Letters》2008,5(1):54-56
The current status of construction and testing of Transition Radiation Detectors (TRD) for ALICE at LHE, JINR, is presented.
The main purpose of this detector is electron identification at intensive pion background. The whole ALICE TRD system is comprised
of 540 wire chambers of total sensitive area ∼750 m2. Each chamber consists of drift and amplifying gaps and a radiator. One hundred such TRD chambers will be constructed at
LHE, JINR.
The text was submitted by the authors in English. 相似文献
10.