Influence of Collisions with Hydrogen on Titanium Abundance Determinations in Cool Stars     

Sitnova  T. M.  Yakovleva  S. A.  Belyaev  A. K.  Mashonkina  L. I. 《Astronomy Letters》2020,46(2):120-130

Astronomy Letters - The possibility of solving the problem of a discrepancy in the non-LTE abundances from Ti I and Ti II lines in metal-poor stars is investigated by applying accurate data to take...  相似文献   

Studies of the planetary atmospheres in Russia (2007–2010)     

O. I. Korablev  L. V. Zasova  A. A. Fedorova  D. V. Titov  N. I. Ignatiev  A. V. Rodin  V. I. Shematovich  D. A. Belyaev  I. V. Khatuntsev  M. N. Izakov  A. V. Shakun  A. V. Burlakov  B. S. Mayorov 《Izvestiya Atmospheric and Oceanic Physics》2012,48(3):309-331

An overview of results obtained in the field of planetary atmosphere studies in Russia in 2007?C2010 prepared by the Commission on Planetary Atmospheres of the National Geophysical Committee for the National Report on Meteorology and Atmospheric Sciences to the XXV General Assembly of the International Union of Geodesy and Geophysics (Melbourne, 28 June?C7 July 2011) [1, 2] is presented.  相似文献   

The plankton community of the Kara Sea in early spring     

Sazhin  A. F.  Mosharov  S. A.  Romanova  N. D.  Belyaev  N. A.  Khlebopashev  P. V.  Pavlova  M. A.  Druzhkova  E. I.  Flint  M. V.  Kopylov  A. I.  Zabotkina  E. A.  Ishkulov  D. G.  Makarevich  P. R.  Pasternak  A. F.  Makkaveev  P. N.  Drozdova  A. N. 《Oceanology》2017,57(1):222-224

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Alkanes in Quaternary deposits of the Laptev Sea     

E. A. Romankevich  A. A. Vetrov  N. A. Belyaev  V. I. Sergienko  I. P. Semiletov  S. V. Sukhoverkhov  S. Yu. Bratskaya  N. A. Prokuda  A. S. Ulyantsev 《Doklady Earth Sciences》2017,472(1):36-39

The distribution and genesis of n-alkanes in sediments from the 38-m sequence obtained during core boring in the Ivashkina lagoon were studied. Sediments were formed in the Holocene as a result of thermokarst and penetration of seawater. The sequence mostly includes permafrost rocks partially molten in the upper horizons and covered by Quaternary deposits, which are mostly the products of thermoabrasion.  相似文献   

Influence of inelastic collisions with hydrogen atoms on the formation of AlI and SiI lines in stellar spectra     

L. I. Mashonkina  A. K. Belyaev  J.-R. Shi 《Astronomy Letters》2016,42(6):366-378

We have performed calculations by abandoning the assumption of local thermodynamic equilibrium (within the so-called non-LTE approach) for Al I and Si I with model atmospheres corresponding to stars of spectral types F–G–Kwith differentmetal abundances. To take into account inelastic collisions with hydrogen atoms, for the first time we have applied the cross sections calculated by Belyaev et al. using model approaches within the formalism of the Born–Oppenheimer quantum theory. We show that for Al I non-LTE leads to higher ionization (overionization) than in LTE in the spectral line formation region and to a weakening of spectral lines, which is consistent with earlier non-LTE studies. However, our results, especially for the subordinate lines, differ quantitatively from the results of predecessors. Owing to their large cross sections, the ion-pair production and mutual neutralization processes Al I(nl) + HI(1s) ? Al II(3s ²) + H^? provide a close coupling of highly excited Al I levels with the Al II ground state, which causes the deviations from the equilibrium level population to decrease compared to the calculations where the collisions only with electrons are taken into account. For three moderately metal-deficient dwarf stars, the aluminum abundance has been determined from seven Al I lines in different models of their formation. Under the assumption of LTE and in non-LTE calculations including the collisions only with electrons, the Al I 3961 ?A resonance line gives a systematically lower abundance than the mean abundance from the subordinate lines, by 0.25–0.45 dex. The difference for each star is removed by taking into account the collisions with hydrogen atoms, and the rms error of the abundance derived from all seven Al I lines decreases by a factor of 1.5–3 compared to the LTE analysis. We have calculated the non- LTE corrections to the abundance for six subordinate Al I lines as a function of the effective temperature (4500 K ≤ T _eff ≤ 6500 K), surface gravity (3.0 ≤ log g ≤ 4.5), and metal abundance ([M/H] = 0, ?1, ?2, and ?3). For Si I including the collisions with HI leads to the establishment of equilibrium populations in the spectral line formation region even in hot metal-deficient models and to vanishingly small departures from LTE in spectral lines.  相似文献   

Analysis of the variability of hydrological characteristics of the north subpolar front using the model of frontal-trapped baroclinic Rossby waves     

K. P. Belyaev  S. S. Lappo  V. P. Tereshchenkov 《Physical Oceanography》1991,2(4):283-291

Solutions, termed frontal-trapped Rossby waves, have been found for the long-wave equation in a model of a two-layer fluid with the frontal boundary given in the form of an exponential function. Data from a hydrological survey of a subpolar hydrological front in the vicinity of Newfoundland are analysed. A frontal-trapped wave model is shown to describe about 40% of the dispersion of the initial seawater density field. Translated by V. Puchkin.  相似文献   

Application of a probabilistic method to the analysis of accumulation of toxic substances by marine organisms     

V. I. Belyaev  V. N. Komorin 《Physical Oceanography》1999,10(1):85-91

The process of accumulation of toxic substances by marine organisms is studied on the basis of the kinetic theory of systems of macroscopic particles (V. I. Belyaev, 1987). The use of stochastic equations makes it possible to evaluate the degree of accumulation of toxic substances in marine organisms and take into account random variations of their concentrations in marine environments. Translated by Peter V. Malyshev and Dmitry V. Malyshev.  相似文献   

Methods of the Theory of Water Flow in Porous Media in Problems Arising in Bog Watering     

A. Yu. Belyaev  G. N. Krichevets  N. P. Akhmet’eva 《Water Resources》2018,45(4):532-541

The analysis of hydrogeological problems arising in bog watering by methods enabling the depth to groundwater table to be controlled was used to develop a method for estimating the efficiency of such control when data for directly solving groundwater flow problems are lacking. The effect of nonmonotone dependence of the rate of groundwater level rise on the hydraulic conductivity of peat underlain by high-permeability sand rocks is described. This effect is shown to be significant in assessing the potentialities of the operational control of groundwater level in bog massifs with this type of geological structure.  相似文献   

Geoecological Aspects of the Development of a Regional Model of Spatial Planning: Case Study of Moscow     

S. S. Bachurina  V. L. Belyaev  E. A. Karfidova 《Water Resources》2017,44(7):978-986

Geoenvironmental aspects are of importance in the development of regional models of spatial planning. The experience of Moscow can be used to determine the composition of spatial data, the cartographic resources to be incorporated, and the ways to improve the efficiency of their use, as well as to determine the logical structure of the model for developing the documents of spatial planning.  相似文献   

Zooplankton in Bays of the Novaya Zemlya Archipelago: Composition,Distribution, and Role in Phytoplankton Grazing and Biosedimentation     

Amelina  A. B.  Drits  A. V.  Sergeeva  V. M.  Soloviyev  K. A.  Belyaev  N. A.  Dara  O. M.  Demidov  A. B.  Flint  M. V. 《Oceanology》2018,58(6):825-837

Oceanology - The zooplankton community in two bays of the eastern coast of the Novaya Zemlya archipelago (Blagopoluchiya Bay and Tsivolki Bay) has been studied for the first time. Copepods of the...  相似文献