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131.
D. Molteni O.A. Kuznetsov D.V. Bisikalo A.A. Boyarchuk 《Monthly notices of the Royal Astronomical Society》2001,327(4):1103-1110
Results of three-dimensional numerical simulations of the gas transfer in close binary systems show that, in addition to the formation of a tidally induced spiral shock wave, it is also possible for accretion streams to be produced, having low specific angular momentum in a region close to the accreting star. These streams are mainly placed above the orbital disc but are also unevenly present in the equatorial plane. The relevance of such flows is related to formation of hot coronae or bulges in regions very close to the accretor centre. The eventual formation of such bulges and shock-heated flows is interesting in the context of advection-dominated solutions and for the explanation of spectral properties of the black hole candidates in binary systems. 相似文献
132.
133.
S. I. Boldyrev G. S. Ivanov-Kholodnyi O. P. Kolomiitsev V. D. Kuznetsov A. N. Afanas'ev A. I. Osin 《Solar System Research》2005,39(6):501-507
The results of analysis of the trajectory parameters of the orbit of the CORONAS-F spacecraft since its launch (July 2001) and to the present time are reported. Two independent methods are used to compute a prediction for the active lifetime of the satellite in the near-Earth orbit for the period from 2005 through 2006. 相似文献
134.
A. V. Shatsillo N. B. Kuznetsov V. E. Pavlov M. A. Fedonkin N. S. Priyatkina S. G. Serov S. V. Rudko 《Doklady Earth Sciences》2015,465(2):1211-1214
New paleomagnetic and magnetostratigraphic data are presented for the stratotype of the Upper Riphean Lopata Formation (Teya River, Yenisei Ridge). The paleomagnetic pole calculated is significantly distinct from the Phanerozoic and Riphean poles of the Siberian Platform and is similar to the Late Vendian–Early Cambrian poles of the Madagascar Group. The stratigraphic range studied is characterized by an anomalously high frequency of geomagnetic inversions (15 zones of magnetic polarity), which is comparable with the inversion frequency of the Late Vendian sections of Baltica. These data, along with previous paleontological findings, indicate an age of the Lopata Formation of 555–540 Ma. 相似文献
135.
A. B. Kuznetsov I. M. Gorokhov G. V. Ovchinnikova V. A. Melezhik I. M. Vasil’eva B. M. Gorokhovskii G. V. Konstantinova N. N. Mel’nikov 《Lithology and Mineral Resources》2011,46(2):151-164
The Rb-Sr and U-Pb systematics have been studied in the metasedimentary carbonate rocks from the Paleoproterozoic Kuetsjarvi
Formation. Samples were taken from the borehole drilled in the northern zone of the Pechenga Greenstone Belt in the northwestern
Kola Peninsula. The carbonate section of the formation is made up of three units (from the bottom to top): (I) dolomite (68
m), (II) calcareous-dolomite (9 m), and (III) clayey calcareous (1 m) ones. Dolomites (Mg/Ca = 0.55–0.61) from the lowermost
unit I contain 70.3–111 ppm Sr. Initial 87Sr/86Sr ratio in them varies within 0.70560–0.70623 and characterizes the primary continental-lacustrine carbonate sediments. Calcareous
dolomites (Mg/Ca = 0.39–0.59) and dolomitic limestones of units II and III (Mg/Ca = 0.02–0.36) are enriched in Sr (285–745
and 550–1750 ppm, respectively). Initial 87Sr/86Sr ratios in these rocks (0.70406–0.70486 and 0.70407–0.70431, respectively) fall within the range typical of the Jatulian
seawater, which indicates that the carbonate sediments of two upper units were formed in an open marine basin. Study of dolomites
from unit I showed that the Svecofennian metamorphism more significantly affected the U-Pb systems of carbonate rocks as compared
to their Rb-Sr systems. In the 207Pb/204Pb-206Pb/204Pb diagram, most data points corresponding to the carbonate constituent of dolomites define isochron with an age of 1900 ±
25 Ma (MSWD = 0.5). The same samples define a positive correlation in the 208Pb/204Pb-206Pb/204Pb plot. Since sedimentary carbonates usually do not contain Th, this correlation points to secondary enrichment of the studied
dolomites in Th or thorogenic 208Pb. Hence, the obtained Pb-Pb dating can be regarded as the age of the Svecofennian metamorphic event. Three samples from
dolomites of unit I lack any disturbance of the initial U-Th-Pb systematics, but their trend in the 207Pb/204Pb-206Pb/204Pb diagram deviates from the 1900 Ma isochron. Based on these samples, the model U-Pb premetamorphic age of the Kuetsjarvi
carbonate sediments is 2075–2100 Ma. This interval is consistent with the age range of the Lomagundi-Jatulian event, which
was responsible for the formation of carbonate sediments with high positive δ13C values. 相似文献
136.
V. G. Kuznetsov 《Lithology and Mineral Resources》2011,46(5):457-472
Major types of coarse-detrital carbonate and sulfate rocks (psephites) are considered. Two large (allochthonous and autochthonous)
genetic groups are defined. Characteristics of some representatives are given for each group. It is shown that psephites of
the carbonate and sulfate composition differ from similar rocks of the quartz and quartz-silicate composition in terms of
formation mechanisms and depositional environments. 相似文献
137.
138.
E. D. Kuznetsov P. E. Zakharova D. V. Glamazda S. O. Kudryavtsev 《Solar System Research》2014,48(6):446-459
The area-to-mass ratio of high-orbit space objects is estimated on the basis of positional observations from the SBG telescope at the Kourovka astronomical observatory of the Ural Federal University. The properties of regions where high-order resonances are located are analyzed. The position and sizes of the resonance zones depending on the area-to-mass ratio of objects are determined on the basis of numerical modeling. It is shown that a system transits through the high-order resonances due to secular perturbations of the semimajor axis under the Poynting-Robertson effect. The high-order resonances weakly influence the formation of the stochastic trajectories. The stochastic properties are mostly manifested in evolution of the semimajor axis of the orbit. 相似文献
139.
The article addresses methodological aspects of a development strategy to design a launch vehicle system for orbit insertion. The development and implementation of the strategy are broadly outlined. An analysis is provided of the criterial base and input data needed to define the main requirements for the launch vehicle system. Approaches are suggested for solving individual problems in working out the launch vehicle system development strategy. 相似文献
140.
A. V. Koldoba O. A. Kuznetsov G. V. Ustyugova 《Monthly notices of the Royal Astronomical Society》2002,333(4):932-942
A Godunov-type scheme for relativistic magnetohydrodynamic (MHD) equations is developed. We consider the Maxwell equations and dynamic equations for a gas with perfect conductivity in hyperbolic form as was suggested by van Putten. To calculate the fluxes of conservative variables through cells' interfaces we suggest an algorithm for the solution of the linearized Riemann problem. 'Primitive' variables are calculated by solving a non-linear system using the Newton method . 相似文献