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O. Sadot K. Levy A. Yosef-Hai D. Cartoon Y. Elbaz Y. Srebro G. Ben-Dor D. Shvarts 《Astrophysics and Space Science》2005,298(1-2):305-312
The hydrodynamic instability, which develops on the contact surface between two fluids, has great importance in astrophysical
phenomena such as the inhomogeneous density distribution following a supernova event. In this event acceleration waves pass
across a material interface and initiate and enhance unstable conditions in which small perturbations grow dramatically.
In the present study, an experimental technique aimed at investigating the above-mentioned hydrodynamic instability is presented.
The experimental investigation is based on a shock-tube apparatus by which a shock wave is generated and initiates the instability
that develops on the contact surface between two gases. The flexibility of the system enables one to vary the initial shape
of the contact surface, the shock-wave Mach number, and the density ratio across the contact surface.
Three selected sets of shock-tube experiments are presented in order to demonstrate the system capabilities: (1) large-initial
amplitudes with low-Mach-number incident shock waves; (2) small-initial amplitudes with moderate-Mach-number incident shock
waves; and (3) shock bubble interaction.
In the large-amplitude experiments a reduction of the initial velocity with respect to the linear growth prediction was measured.
The results were compared to those predicted by a vorticity-deposition model and to previous experiments with moderate- and
high-Mach number incident shock waves that were conducted by others. In this case, a reduction of the initial velocity was
noted. However, at late times the growth rate had a 1/t behavior as in the small-amplitude low-Mach number case. In the small-amplitude moderate-Mach number shock experiments a
reduction from the impulsive theory was noted at the late stages.
The passage of a shock wave through a spherical bubble results in the formation of a vortex ring. Simple dimensional analysis
shows that the circulation depends linearly on the speed of sound of the surrounding material and on the initial bubble radius. 相似文献
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Ptichnikov A. V. Shvarts E. A. Popova G. A. Baibar A. S. 《Doklady Earth Sciences》2022,507(1):981-985
Doklady Earth Sciences - The potential role of forests in achieving carbon neutrality in the Russian Federation by 2060 is analyzed. It is shown that the key rate in the Strategy for the... 相似文献
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E. M. Kaplan A. A. Shvarts E. V. Luneva M. E. Makushenko V. G. Rumynin 《Water Resources》2016,43(7):911-922
The environmental feasibility assessment of the construction and operation of nuclear power stations in near-border areas must take into account the requirements of the international and European environmental legislation. For the study on environment feasibility assessment of the Baltic NPP to meet the international standards, the following steps were taken: the content and the application practice of UNECE Convention on Environmental Impact Assessment in a Transboundary Context (Espoo) to NPP substantiation were analyzed and compared with the Russian procedure of environmental impact assessment (EIA); water quality standards for water bodies used for fishery and the approaches to assessing the damage to aquatic bioresources in Russia, Lithuania (EU), and Belarus were compared. A transboundary network for monitoring aquatic ecosystems was developed in the zone of potential influence of the Baltic NPP, and a permanent mathematical model was developed and used to forecast the effect of the anticipated water discharge from the station on the hydrodynamic, chemical, and temperature regime of the Neman R., whose results were used to forecast the impact of water intake and discharge facilities of the Baltic NPP on the food base and migration character of ichthyofauna. 相似文献
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The decay of an upper hybrid (UH) wave to a lower hybrid (LH) wave and a daughter upper hybrid wave is considered. The linear stage of the process was analyzed for ionospheric conditions and compared with experimental data as well as with theoretical results of other authors. It was shown that the effective excitation of the prominent downshifted maximum feature of stimulated electromagnetic emissions in the ionospheric modification experiments could take place possibly due to interaction between two oblique UH waves and a heavily damped LH wave. 相似文献
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Krenke A. N. Ptichnikov A. V. Shvarts E. A. Petrov I. K. 《Doklady Earth Sciences》2021,501(2):1091-1095
Doklady Earth Sciences - This paper examines the role of forests in national climate policies of two countries very rich in woods: Russia and Canada. Canada has made efforts to reduce direct CO2... 相似文献
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The mechanism responsible for fluid circulation in an internal basin of the Black Sea type is studied using a two-dimensional
model for convective currents generated by the inhomogeneous horizontal gradient of salinity exchange. Analytical investigations
and calculations have shown that the generation of cyclonic motions occurs due to an imbalance of salt fluxes at the fluid
lateral boundaries of the basin. Under the influence of salt fluxes from the straits and the fresh water from rivers, the
circulation tends to become streamlike. At the site of reduced salinity, the stream narrows and becomes more intensive.
Translated by V. Puchkin. 相似文献
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Doklady Earth Sciences - This paper analyzes the possibility to reduce the carbon footprint of exported products by implementing forest climate offset projects amid the introduction of the carbon... 相似文献
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Erzova V. A. Sudarikov S. M. Rumynin V. G. Shvarts A. A. 《Doklady Earth Sciences》2023,507(1):S207-S215
Doklady Earth Sciences - The natural radioactivity and background content of anthropogenic radionuclides in groundwater near the Leningrad NPP were studied based on the results of monitoring... 相似文献
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