Electronic atlas of the Russian Arctic coastal zone     

D. S. Drozdov  F. M. Rivkin  V. Rachold  G. V. Ananjeva-Malkova  N. V. Ivanova  I. V. Chehina  M. M. Koreisha  Yu. V. Korostelev  E. S. Melnikov 《Geo-Marine Letters》2005,25(2-3):81-88

A set of digital maps including geology, Quaternary sediments, landscapes, engineering-geological, vegetation, geocryological and the series of regional sources have been selected to characterize the Russian Arctic coast. Based on this data, new maps of engineering geocryological zoning and zoning of the coast with respect to the intensity of exogenous geological processes and risk of technogenic impacts have been generated at the scales of 1:4,000,000–1:8,000,000. These maps are a tool to assess the impact of industry on the Arctic coast of the country.  相似文献   

Authigenic mineral formation in fluid permeability zones in the West Siberia Permafrost     

A. N. Kurchatova  V. P. Melnikov  V. V. Rogov  E. A. Slagoda 《Doklady Earth Sciences》2016,468(2):571-573

Basic chemical and mineralogical anomalies in permafrost caused by hydrocarbon migration are considered. Direct evidence for bacterial oxidation of light hydrocarbons, primarily methane, were first obtained in fluid permeability zones in the permafrost as a stepwise formation of authigenic minerals such as iron sulfides and oxides, carbonates, silicates, and gypsum.  相似文献   

Identification Features of the Transition and Intermediate Layers in the Polygonal Peatlands in Northwestern Siberia     

Koroleva  E. S.  Slagoda  E. A.  Melnikov  V. P.  Babkina  E. A.  Khomutov  A. V.  Opokina  O. L.  Danko  M. M.  Tikhonravova  Ya. V. 《Doklady Earth Sciences》2021,498(2):465-470

Doklady Earth Sciences - The upper part of the subsurface component of the Earth’s cryosphere—polygonal peatlands—are considered in this paper. The polygonal peatlands are...  相似文献   

Redshift Measurements for Galaxies in Clusters by Multislit Spectroscopy at the 1.5-m Telescope RTT150     

Khamitov  I. M.  Bikmaev  I. F.  Burenin  R. A.  Glushkov  M. V.  Melnikov  S. S.  Lyapin  A. R. 《Astronomy Letters》2020,46(1):1-11

Astronomy Letters - An example of simultaneous spectroscopic redshift measurements for a large number of galaxies in a cluster by multiobject spectroscopy with the medium- and low-resolution TFOSC...  相似文献   

Orbital dynamics of the planetary system HD 196885     

A. V. Melnikov 《Solar System Research》2017,51(4):327-334

The orbital dynamics of the single known planet in the binary star system HD 196885 has been considered. The Lyapunov characteristic exponents and Lyapunov time of the planetary system have been calculated for possible values of the planetary orbit parameters. It has been shown that the dynamics of the planetary system HD 196885 is regular with the Lyapunov time of more than 5 × 10⁴ years (the orbital period of the planet is approximately 3.7 years), if the motion occurs at a distance from the separatrix of the Lidov–Kozai resonance. The values of the planet’s orbital inclination to the plane of the sky and longitude of the ascending node lie either within ranges 30° < i _p < 90° and 30° < Ω_p < 90°, or 90° < i _p < 180° and 180° < Ω_p < 300°.  相似文献   

A photometric and spectroscopic study of the Herbig Ae/Be star XY Per     

S. Yu. Melnikov  O. V. Ezhkova 《Astronomy Letters》2000,26(4):233-243

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Indices of growth of danger for space activities from orbital debris and the related mitigation measures     

S. S. Veniaminov  I. I. Oleynikov  E. K. Melnikov 《Kinematics and Physics of Celestial Bodies》2016,32(5):227-232

Intensive development of near-earth space, often followed by breakups of spacecraft, has led to its significant and progressive contamination. Investigation of this problem seems to be of current importance. Collision of space objects (SO), whose relative velocities reaching up to 17.5 km/s, implies catastrophic consequences, especially for active SOs. Particular trouble is caused concerning piloted spacecraft, in particular for the International Space Station (ISS). In this paper, taking ISS as an example, the dangerous progressive growth of the contamination of near space is shown.  相似文献   

Sr isotopic composition of Paleoproterozoic C-rich carbonate rocks: The Tulomozero Formation,SE Fennoscandian Shield     

A.B. Kuznetsov  V.A. Melezhik  I.M. Gorokhov  N.N. Melnikov  G.V. Konstantinova  E.P. Kutyavin  T.L. Turchenko 《Precambrian Research》2010

Rb–Sr systematics has been studied in ¹³C-rich carbonate rocks of the Paleoproterozoic (2.09 ± 0.07 Ga) Tulomozero Formation in the northern Onega Lake area, the SE Fennoscandian Shield. The formation is divided into eight members (A–F) consisting of greenschist-facies-grade, variegated sandstones, siltstones, mudstones, stromatolitic dolostones and subordinate crystalline limestones. Samples of carbonate rocks were obtained from two overlapping drillholes intersecting the entire thickness of the Tulomozero Formation. Prior to isotope analysis, the rocks powders were treated with 1N ammonium acetate for partial removal of the late epigenetic carbonate phases. Major resetting of the Rb–Sr systems in the Tulomozero carbonate rocks appears to take place during the Svecofennian regional metamorphic event, and it was screened by using Mn/Sr, Fe/Sr, Mg/Ca, and ¹⁸O/¹⁶O ratios. High Sr content (up to 2080 μg/g in limestones, and 530 μg/g in dolostones) coupled with low Fe/Mn (<0.40) ratios in the Tulomozero carbonate rocks of Members A, B (the lower part), D, F, and E are consistent with accumulation of original carbonate sediments in evaporitic lacustrine, playa, and sabkha environments. A decrease in the Sr content with concurrent increase in the Fe/Mn ratio (>0.40) in dolostones of the upper part of Member B, and of Members G and H is indicative of seawater influxes (sea transgression) into the Tulomozero basin. The ⁸⁷Sr/⁸⁶Sr values in the least altered (Mn/Sr < 2.0) marine dolostones are 0.70418–0.70442 and 0.70343–0.70409 for the earlier and late phases of the marine transgression, respectively. The decrease in the ⁸⁷Sr/⁸⁶Sr ratio in ca. 2.1 Ga seawater is attributable to an increase in hydrothermal flux Sr into the Palaeoproterozoic ocean.  相似文献   

Methane Content and Emission in the Typical Tundra and the Southern Tundra of the Western Russian Arctic     

Vasiliev  A. A.  Melnikov  V. P.  Zadorozhnaia  N. A.  Oblogov  G. E.  Streletskaya  I. D.  Savvichev  A. S. 《Doklady Earth Sciences》2022,505(1):506-511

Doklady Earth Sciences - The results of studying the emission, content, and isotopic composition of methane in soils of the active layer in the zones of typical and southern shrubby tundra of the...  相似文献   

On reverberation and cross-correlation estimates of the size of the broad-line region in active galactic nuclei     

A. V. Melnikov  I. I. Shevchenko 《Monthly notices of the Royal Astronomical Society》2008,389(1):478-488

It is known that the dependence of the emission-line luminosity of a typical cloud in the active galactic nuclei (AGN) broad-line regions (BLRs) upon the incident flux of ionizing continuum can be non-linear. We study how this non-linearity can be taken into account in estimating the size of the BLR by means of the 'reverberation' methods. We show that the BLR size estimates obtained by cross-correlation of emission-line and continuum light curves can be much (up to an order of magnitude) less than the values obtained by reverberation modelling. This is demonstrated by means of numerical cross-correlation and reverberation experiments with model continuum flares and emission-line transfer functions and by means of practical reverberation modelling of the observed optical spectral variability of NGC 4151. The time behaviour of NGC 4151 in the Hα and Hβ lines is modelled on the basis of the observational data by Kaspi et al. and the theoretical BLR model by Shevchenko. The values of the BLR parameters are estimated that allow to judge on the size and physical characteristics of the BLR. The small size of the BLR, as determined by the cross-correlation method from the data of Kaspi et al., is shown to be an artefact of this method. So, the hypothesis that the BLR size varies in time is not necessitated by the observational data.  相似文献