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Equations are obtained for a hydrodynamic load on an obstacle, which is modeled by a point dipole during its circulated flow of a two-layered liquid of finite depth. The correlations between the wave resistance and rising force and the rate of the flow and circulation are studied. Examples of numerical calculations for real marine conditions are given. It is shown that the account of circulation can significantly change the value of the hydrodynamic reaction, which impacts the dipole.
相似文献45.
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R.K Moniot T.H Kruse C Tuniz W Savin G.S Hall T Milazzo D Pal G.F Herzog 《Geochimica et cosmochimica acta》1983,47(11):1887-1895
The 10Be contents of 28 stony meteorites with known 21Ne contents range from 0.97 to 23 dpm/kg and give an average 21Ne production rate (P21) of (0.28 ± 0.02) × 108 cm3 STP/g-Myr for shielding conditions corresponding to in an H-chondrite. Our agrees with others' P21 based on 22Na, 81Kr and 53Mn but not on 26A1. Temporal variations in the cosmic ray flux do not explain the disagreement satisfactorily; major errors in the radionuclide half-lives are not indicated. The discrepancy seems rooted in the data selection and the difficulties of making accurate corrections for shielding, chemical composition and other sources of variability. 相似文献
47.
J. Blecki B. Nikutowski P. Koperski B. Popielawska K. Kossacki S. A. Romanov S. P. Savin 《Annales Geophysicae》1994,12(10-11):1006-1017
We present Prognoz-8 observations of low-frequency plasma waves (2-105 Hz) associated with plasma fluxes near the outer boundary of the plasma sheet. These plasma fluxes were different from the regular plasma sheet boundary layer and consisted of tailward flowing warm proton and cold oxygen beams accompanied by rather cold electrons (T e less than 100 eV). Observed plasma characteristics were used in the numerical solution of the dispersion relation for the ion-beam acoustic instability. Detailed analysis shows that this instability can be a source of observed emissions at frequencies up to 25 Hz. 相似文献
48.
Ivanov A. L. Savin I. Yu. Stolbovoy V. S. Avetyan S. A. Shishkonakova E. A. Kashtanov A. N. 《Doklady Earth Sciences》2020,493(2):654-657
Doklady Earth Sciences - The last map of anthropogenic soil erosion in Russia was compiled more than 20 years ago on a scale of 1 : 5 000 000. In recent years, additional data on soil... 相似文献
49.
We studied the structure of the surface perturbations generated by a stratified flow of an ideal fluid of finite depth around underwater obstacles. We consider a cylinder modeled by a point dipole localized near the density interface both above and below the interface. It is shown that density jumps characteristic of the marine medium significantly influence the formation and variability of the structure of the surface perturbations generated during a fluid??s flowing around an underwater obstacle. The results are compared with the data of the previous model calculations made by the authors for an infinite flow around an obstacle [4]. Significant differences between them are revealed, which should be taken into account in the solution of practical problems, for example, monitoring of coastal marine basins. 相似文献
50.
John Gerard Doyle Steven Chapman Paul Bryans David Pérez-Suárez Avninda Singh Hugh Summers Daniel Wolf Savin 《中国天文和天体物理学报》2010,10(1)
Comparison of appropriate theoretically derived line ratios with observational data can yield estimates of a plasma’s physical parameters,such as electron density or temperature.The usual practice in the calculation of the line ratio is the assumption of excitation by electrons/protons followed by radiative decay.Furthermore,it is normal to use the so-called coronal approximation,i.e.one only considers ionization and recombination to and from the ground-state.A more accurate treatment is to include ionizati... 相似文献