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排序方式: 共有156条查询结果,搜索用时 781 毫秒
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A. T. Soldatenkov K. B. Polyanskii A. V. Temesgen N. D. Sergeeva V. V. Vysotskaya B. B. Averkiev M. Yu. Antipin N. N. Lobanov 《Chemistry of Heterocyclic Compounds》2004,40(5):641-649
New derivatives of piperidino[4,5-d]dioxane and 3-oxa-7-bicyclo[3.3.1]nonane were obtained by the oxidatively catalysed condensation of 4-aryl-1,2,3,6-tetrahydropyridines with formaldehyde. The direction of this reaction is sharply altered in the presence of manganese dioxide to give 6-oxa-2-azabicylo[3.2.1]octan-4-one — the product of the oxidative condensation of a new type. 相似文献
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V. I. Bubnov D. V. Isakov I. G. Lozino-Lozinskaya A. M. Polyanskii 《Journal of Engineering Thermophysics》2008,17(4):292-299
Elements of the liquid-propellant rocket engines (LPREs) are subject to the action of intense mechanical and thermal loads,
which are temporally related to the start-up, normal regime, and switch-off periods of the working cycle. Recoverable LPREs
experience these loads many times. Repeated (cyclic) loads lead to the manifestation of processes typical of fatigue, whereby
residual stresses and (plastic) deformations are retained and accumulated in the LPRE materials. Numerical investigations
using models of the nonstationary thermal and stressed-strained state and the plastic behavior of materials have been performed
in order to determine the limiting numbers of loading cycles for the structural materials employed in various units of LPREs.
A special computational-experimental procedure is described, which allows these materials to be studied in a stressed-strained
state close to that in real LPREs. 相似文献
5.
V. V. Gogosov V. A. Polyanskii I. P. Semenova A. E. Yakubenko 《Journal of Applied Mechanics and Technical Physics》1969,10(1):1-7
The motion of a medium consisting of neutral particles and charged particles of single sign is studied under the assumption that the electric Reynolds number (Rq=u/bE) is large. We calculate the freezingin integral and the Bernoulli and Cauchy-Lagrange integrals, study the fluid motion in a stream tube, and formulate the boundary layer problem. 相似文献
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AA Yan LI Kai CAO ZhongHua & HU WenRui Key Laboratory of Microgravity 《中国科学:物理学 力学 天文学(英文版)》2011,(2)
The dependency of the critical Marangoni number on the geometrical aspect ratio of the floating half zone is essential to predict the onset of oscillatory thermocapillary convection.The experimental studies in the microgravity conditions on floating half zones of several centimeters in diameter have predicted that the critical Marangoni number increases with the increasing aspect ratio,and the terrestrial experimental studies have predicted the contradictory conclusion for floating half zones of several mil... 相似文献
8.
M. Tarasov A. Shul’man O. Polyanskii A. Vystavkin E. Kosarev D. Golubev E. Stepantsov M. Darula O. Harnack Z. Ivanov 《JETP Letters》1999,70(5):340-345
A Josephson high-temperature superconducting (HTSC) submillimeter-wave spectrometer is designed, built, and experimentally
investigated. The integrated detection structure of the spectrometer includes a YBCO Josephson junction on a bicrystalline
boundary, a double-slot or log-periodic antenna, and a low-inductance resistive shunt. The selective detector response and
the response at an intermediate frequency of 1.4 GHz are measured under the action of a signal in the frequency range 350–1250
GHz. Three methods of spectroscopy are investigated using this setup: 1) a method of Hilbert spectroscopy with processing
of the detector response is implemented; 2) it is found that for a wide Josephson line at intermediate frequency (IF) the
response has the same form as the detector response, making it possible to obtain a spectrum and the width of the generation
line from IF response measurements; 3) for a narrow Josephson line the IF response corresponds to the regime of conversion
with self-pumping. A new method is proposed for calculating the emission spectrum. The method consists of simple shift, summation,
and subtraction operations. The advantages of the method are simplicity, high sensitivity, and high resolution.
Pis’ma Zh. éksp. Teor. Fiz. 70, No. 5, 338–343 (10 September 1999) 相似文献
9.
Non-Gravitational Effects with Density-Matching in Evaluating the Influence of Sedimentation on Colloidal Coagulation
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The method of density matching between the solid and liquid phases is often adopted to effectively eliminate the effect of sedimentation of suspensions in studies on dynamic behaviour of a colloidal system. However, the associated changes in the solvent composition may bring side effects to the properties investigated and therefore might lead to a faulty conclusion if the relevant correction is not made. To illustrate the importance of this side effect, we present an example of the sedimentation influence on the coagulation rate of suspensions of 2μm (diameter) polystyrene. The liquid mixtures, in the proper proportions of water (H2O), deuterium oxide (D2O) and methanol (MeOH) as the liquid phase, density-matched and unmatched experiments are performed. Besides the influence of viscosity, the presence of methanol in solvent media, used to enhance the sedimentation effect, causes significant changes (reduction) in rapid coagulation rates compared to that in pure water. Without the relevant corrections for those non-gravitational factors it seems that gravitational sedimentation would retard the coagulation. The magnitude of the contribution from the non-gravitational factor is quantitatively determined, making the relevant correction possible. After necessary the influence of the sedimentation on coagulation rates at corrections for all factors, our experiments show that the initial stage of the coagulation is not observable. 相似文献
10.