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21.
A.?I.?ErofeevEmail author A.?P.?Nikiforov G.?A.?Popov M.?O.?Suvorov S.?A.?Syrin S.?A.?Khartov 《Solar System Research》2017,51(7):639-645
Problems on designing the air-breathing ramjet electric propulsion thruster for controlling loworbit spacecraft motion are examined in the paper. Information for choosing orbits’ altitudes for reasonable application of an air-breathing ramjet electric propulsion thruster and propellant exhaust velocity is presented. Estimates of the probable increase of gas concentration in the area of air-breathing ramjet ionization are presented. The test results of the thruster are also given. 相似文献
22.
Izvestiya, Physics of the Solid Earth - Abstract—From seismic data in the crust is revealed the structures of the Priverkhoyansk foredeep and local Backgraben (together with the adjacent part... 相似文献
23.
A. K. Suvorov 《地理信息系统科学与遥感》2013,50(4):320-334
A review of the Soviet and foreign literature on nontraditional cartographic images (cartograms) sets the stage for a critique of the position that they are only distorted versions of conventional maps. The author argues that nontraditional images are a legitimate form of cartographic presentation, employing a special non-spatial (topologic) system of measurement. As such, they are uniquely suited for the portrayal of certain kinds of information (i.e., socioeconomic) where elucidation of quantitative relations among features is more important than their faithful geometric representation. Procedures for transforming traditional images into nontraditional ones are described. Translated from: Izvestiy a AN SSSR, seriya geograficheskaya, 1984, No. 5, pp. 121-133. 相似文献
24.
A. K. Suvorov 《地理信息系统科学与遥感》2013,50(4):301-306
A survey of the use of topologic concepts of space in map transofrmation supports the author's contention that so-called “transformed images” represent for the most part rather arbitrary distortions of conventional maps constructed in Euclidean space. This paper demonstrates how truly topologic images can be created “from scratch,” i.e., without manipulation of either the sizes or shapes of areal units on preexisting maps. Images created by quantitatively defining “graphic ratios” of areal units can thus be replicated by other cartographers with a minimum of subjectivity. Translated from: Geodeziya i kartografiya, 1984, No. 12, pp. 28-31. 相似文献
25.
The motion and radiation of relativistic particles with radiation reaction in a strong magnetic field has been considered. The kinetic equation determining the relaxation of the distribution function with radiation reaction has been investigated. The universal one-dimensional distribution function is found to which any isotropic ultrarelativistic distribution in a strong magnetic field is relaxed. It is of power type –3 for ultrarelativistic energies mc
2. Estimations are made which indicate that under the pulsar conditions the one-dimensional electron distribution function is likely formed due to radiation losses while for ions the one-dimensionalization is associated with the conservation of the adiabatic invariant. 相似文献
26.
On the basis of the climatic data array on temperature and salinity including the data of observations carried out at 102,000 oceanographic stations in 1910–1998, we estimate the amount of available potential energy of large-scale processes in the 0–300-m layer of the Black Sea and study its annual variability. The annual average amount of available potential energy in the active 0–300-m layer is equal to 13.5×1014 J, its maximum amount attained in March is 25×1014 J, and its minimum amount attained in August is 8×1014 J. In the autumn–winter period, the density of available potential energy in the 0–50-m layer increases and its maximum is attained in December–January (30 J/m3). Beginning with January, the density of available potential energy increases in the layer of the main pycnocline (50–150 m). Its maximum is attained in March (50 J/m3) and then this quantity decreases till August (down to 14 J/m3). In August, we study the interdecadal variability of the available potential energy in the 50–300-m layer by using the data accumulated for decadal periods with five-year shifts in 1956–1995. The maximum variability is observed at a depth of 100 m. The maximum average (over the sea) amounts of available potential energy were observed in 1961–1970 and 1986–1995. The minimum amounts were recorded in 1976–1985. 相似文献
27.
S. K. Konovalov V. N. Eremeev A. M. Suvorov A. Kh. Khaliulin E. A. Godin 《Aquatic Geochemistry》1999,5(1):13-27
Information on the depth of the sulfide onset in the Black Sea has been analyzed for the period 1910–1995. Correlation between the depth of the sulfide onset and the density structure of the layer of the main pycnocline is significant for the entire period covered. Correlation coefficients (R) between the depth of the sulfide onset and the position of isopycnal surfaces in the layer of the main pycnocline vary, on average, 0.71–0.88. The average value of density (t) at the depth of sulfide onset, defined as a sulfide concentration equal to 3 M, is close to 16.17. Oscillations in the average depth of the sulfide onset range over 24 m and indicate that a steady-state trend does not occur. The period of these oscillations may occur over a century timescale. The dataset for the period 1960–1995 has been used to analyze temporal variations in concentrations of sulfide inside the anoxic zone of the Black Sea. The results of isopycnal analysis demonstrate that possible temporal variations in the average position of sulfide onset versus density (t) scale do not exceed 0.15, which is close to the limit of uncertainties for data obtained before 1988. In contrast, a prominent increase in sulfide concentration, as well as nutrient levels, within the anoxic zone is shown and is related to anthropogenic impact. 相似文献
28.
V. N. Eremeev A. M. Suvorov A. Kh. Khaliulin E. A. Godin A. A. Sizov 《Physical Oceanography》1997,8(4):293-296
On the basis of the measurements collected by MHI and other scientific institutions during expeditions in various parts of
the Black Sea and in various seasons, the variability of the upper boundary of the hydrogen sulphide zone and the respective
isopycnic surface is considered, as well as the relationship between the latter parameters and the index of atmospheric circulation.
Correlation between the studied processes in the Black Sea and atmosphere has been found to be very high.
Translated by Vladimir A. Puchkin. 相似文献
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A brief resumé of the results of the linear theory of the synchrotron instability is presented, obtained using the quantum method with the Einstein coefficients and the classical method with the kinetic equation. The full equivalence is shown for the results of quantum and classical treatment of synchrotron instability.The expression for the growth-rate of synchrotron radiation in a system of relativistic electrons with an anisotropic momentum distribution is also found and investigated. Such a distribution might be realised in certain sources of cosmic radio emission (for example in pulsars). Certain problems are noted which have not yet been properly solved in studies of the synchroton instability (the instability of a highly rarified plasma, the quasi linear theory of the synchrotron instability, and so on). 相似文献