New Orbit and Estimate of the Mass of the Star 61 Cygni Based on Observations of it in 1819-2019     

Izmailov  I. S.  Shakht  N. A.  Polyakov  E. V.  Gorshanov  D. L.  Pogodin  M. A. 《Astrophysics》2021,64(2):160-171

Astrophysics - This paper is a continuation of our earlier work devoted to determining the orbit and mass of the star 61 Cyg and the changes in the photometric characteristics of its components....  相似文献   

Determination of the Total Ozone Content in Cloudy Conditions based on Data from the IKFS-2 Spectrometer onboard the Meteor-M no. 2 Satellite     

Garkusha  A. S.  Polyakov  A. V.  Timofeev  Yu. M.  Virolainen  Ya. A.  Kukharsky  A. V. 《Izvestiya Atmospheric and Oceanic Physics》2018,54(9):1244-1248

Izvestiya, Atmospheric and Oceanic Physics - A new technique has been developed to obtain the total ozone content (TOC) under cloudy conditions from the spectra of outgoing thermal IR radiation...  相似文献   

Simultaneous Calculation of Chemical and Isotope Equilibria Using the <Emphasis Type="Italic">GEOCHEQ_Isotope</Emphasis> Software: Carbon Isotopes     

M. V. Mironenko  V. B. Polyakov  M. V. Alenina 《Geochemistry International》2018,56(13):1354-1367

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Accumulation of Heavy Metals by Amur Bay Sediments (the Sea of Japan) under the Effect of Biochemical Factors     

Polyakov  D. M.  Mar’yash  A. A.  Mozherovskii  A. V. 《Water Resources》2019,46(2):209-213

Water Resources - The average concentrations of elements Fe, Mn, Zn, Pb, Cu, Cr, V, Co, Cd, Ni, As, and Mo in the subcolloidal fraction of bottom sediments were determined in the northern and...  相似文献   

Simulation of the molecular mass distributions of Si anions on the liquidus of the Na<Subscript>2</Subscript>O-SiO<Subscript>2</Subscript> system with regard for the disproportionation of <Emphasis Type="Italic">Q</Emphasis> structons     

A. A. Ariskin  A. V. Shil’dt  V. B. Polyakov 《Geochemistry International》2011,49(4):355-374

A new version of the STRUCTON (2009) computer model is proposed for the simulation of the molecular mass distributions (MMD) characterizing the diversity of anions in silicate melts depending on their polymerization and temperature. In contrast to earlier versions, the new version of the model accounts for disproportionation reactions of Q ⁿ species and makes use of their proportions in the statistical simulations of the origin of real Si-O complexes. The new potentialities of the STRUCTON program package are illustrated by its application to studying the structural-chemical characteristics of melts in the Na₂O-SiO₂ system along its liquidus line, including the points of eutectics and phase transitions at 0.333 ≤ $ N_{SiO_2 } $ N_{SiO_2 } < 0.500. This problem is solved with the use of a temperature-composition dependence of polymerization constants K _p ^Na in the Toop-Samis approximation. The variations in K _p ^Na were proved to be as large as three orders of magnitude due to both the temperature effect at a constant composition and the composition effect at a constant temperature. The results of the MMD simulations on the liquidus show that the concentration of the SiO₄⁴⁻ ion strongly decreases, and the proportion of chain species increases compared to those at a stochastic distribution. The concentration of the Si₂O₇⁶⁻ anion reaches its maximum (∼42%) at 40 mol % in the liquid, i.e., the composition of Na₆Si₂O₇. At $ N_{SiO_2 } $ N_{SiO_2 } > 0.40, this ion dominates over the SiO₄⁴⁻ monomer. More silicic melts with $ N_{SiO_2 } $ N_{SiO_2 } ≥ 0.45, are dominated by (Si _n O_3n )³ⁿ⁻ ring species, and the concentrations of these species are related as (Si₃O₉)⁶⁻ > (Si₄O₁₂)⁸⁻ > (Si₅O₁₅)¹⁰⁻. The maximum concentration of these flat rings also occurs near the composition of stoichiometric metasilicate with Si/O = 0.333. The comparison of the dependence of the average size of anions i _av and the average number of their species on depolymerization indicates that a change in the proportion of Q ⁿ species in melt at decreasing temperature results in structural restyling and an increase in the average size of Si-O complexes. The average number of anion species thereby decreases compared to that in a stochastic MMD. The results presented in this publication direct the progress in the thermodynamic theory of silicate melts to a new avenue that makes use of the capabilities and advantages of the ion-polymer model, the theory of associated solutions, spectroscopic data, and the experimental study of variations in oxide activities depending on composition and temperature.  相似文献   

The geochemical role of phyto- and zooplankton in the extraction of chemical elements from water     

M. J. Chebotina  E. V. Polyakov  V. P. Guseva  N. A. Khlebnikov  V. T. Surikov 《Doklady Earth Sciences》2011,439(2):1138-1140

This paper provides for the first time comparative assessment of the contents of 70 chemical elements occurring in the aquatic environment in water, phytoplankton, and zooplankton. The assessment was made using modern highly sensitive methods. The studies were performed at Beloyarskoe Reservoir, a manmade freshwater lake situated in the Middle Urals that has been studied in detail. The chemical elements were ranked in groups differing in the accumulation coefficient (AC) values for the phyto- and zooplankton. The comparison revealed that for the vast majority of chemical elements, the AC values were higher in zooplankton (53, or 76%) than in phytoplankton (17, or 24%). The average AC values for zooplankton (∼740 000) exceeded that for phytoplankton (∼68 000) by more than 10 times. It was found that some elements had very high AC values in zooplankton compared to phytoplankton. For instance for Nb, the ratio AC_zoo/AC_phyto was 1 200 000; for B, Ta, Sn, Lu, U, 300 000–500 000; for Sb and Y, 100 000–130 000; for La and Nd, 80 000–85 000; for Mo, Cd, Pr, Gd, Dy, Sc, Se, Bi, 20 000–30 000; and for Pd, Hf, Sm, Sb, Er, As, 10 000–20 000. It is concluded that zooplankton is sometimes more suitable for the biogeochemical indication of the pollution of natural water bodies, because the AC values for most elements are much higher in zooplankton than in phytoplankton and the total plankton. Considering the high assimilability of microelements and radionuclides, the plankton may serve not only as an indication but also as the mean of regulated purification of waterbodies from these elements.  相似文献   

Observing solar phenomenas with the large solar vacuum telescope     

N. M. Firstova  V. I. Polyakov 《Geomagnetism and Aeronomy》2011,51(7):888-892

The large solar vacuum telescope (LSVT) was designed to study solar phenomenas with high spatial and spectral resolution. Due to the large size of the telescope, its real spatial resolution may be as high as ≈0.4 arcsec, which makes it possible to observe fine-structure solar phenomenas like Ellerman bombs and pores. At present, the main subjects of investigation are solar flares. The LSVT research methods—spectral, spectropolarimetric, and filter—provide valuable information on the physical parameters in the phenomenas under study. Spectra and images of the Sun are recorded through an birefringent filter by two CCD cameras.  相似文献   

Measurements of the hydrogen fluoride total column amount in the atmosphere over the vicinity of St. Petersburg     

A. V. Poberovskii  A. V. Polyakov  Yu. M. Timofeev 《Izvestiya Atmospheric and Oceanic Physics》2010,46(2):261-263

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Atmospheric temperature sounding with the Fourier spectrometer     

V. V. Asmus  Yu. M. Timofeyev  A. V. Polyakov  A. B. Uspensky  Yu. M. Golovin  F. S. Zavelevich  D. A. Kozlov  A. N. Rublev  A. V. Kukharsky  V. P. Pyatkin  E. V. Rusin 《Izvestiya Atmospheric and Oceanic Physics》2017,53(4):428-432

Preliminary results of a space experiment using the IKFS-2 infrared sounder (Meteor-M2 satellite) showed high-quality of measurements of spectra of the outgoing thermal radiation of the atmosphere–surface system and the adequacy of developed IR radiation atmospheric models in the 15-μm carbon gas absorption band used to recover the vertical profiles of the atmospheric temperature. Outgoing radiation spectra measured by IKFS-2 instruments make it possible to restore vertical temperature profiles with errors close to 1K in most of the 0–30 km high-altitude region, except for the lower troposphere and altitudes above 30 km, where these errors are close to 2–3K.  相似文献   

Estimating the influence of filtering during the operation of the Pauzhetka and Mutnovskii high-temperature geothermal fields,Kamchatka, Russia     

A. V. Kiryukhin  N. P. Asaulova  O. B. Vereina  A. Yu. Polyakov 《Journal of Volcanology and Seismology》2014,8(3):156-167

It is shown that the productive reservoir received considerable quantities of meteoric water during the operation of the Pauzhetka geothermal field (1960–2007), which amounted to 30% of the total with-drawal of heat carrier. This led to cooling of the productive reservoir and reduced steam extraction. Modeling the operation process with the infiltration zones sealed shows that steam extraction can be enhanced by 23.2%. Multi-option modeling for the operation of the Dachnyi site of the Mutnovskii geothermal field shows that the most-likely scenario is infiltration of meteoric water with a discharge of about 60 kg/s into the productive reservoir from above. These results are consistent with the decrease in the steam concentration during the first 4 years of operation.  相似文献