16 research outputs found
Astronomy Reports V. 48, I. 11
No full textAstronomy Reports -- November 2004
Volume 48, Issue 11, pp. 877-964
A Unified Theory for the Formation of Galactic Structures
V. L. Polyachenko and E. V. Polyachenko
pp. 877-899 Full Text: PDF (1238 kB)
Quasi-Simultaneous VLBI and RATAN-600 Observations of Active Galactic Nuclei
A. B. Pushkarev, Yu. Yu. Kovalev, I. E. Molotov, M. B. Nechaeva, Yu. N. Gorshenkov, G. Tuccari, C. Stanghellini, X. Hong, J. Quick, S. Dougherty, and X. Liu
pp. 900-908 Full Text: PDF (289 kB)
The Initial Mass Function and History of the Star-Formation Rate in Star-Forming Complexes in Galaxies
F. Kh. Sakhibov and M. A. Smirnov
pp. 909-920 Full Text: PDF (229 kB)
Development of the Geometric Structure of the Thermonuclear-Deflagration Front in Type Ia Supernovae
M. V. Popov, S. D. Ustyugov, and V. M. Chechetkin
pp. 921-933 Full Text: PDF (1152 kB)
Influence of Binary Stars on the Chemical Evolution of Damped Lyalpha Systems
E. R. Kasimova
pp. 934-940 Full Text: PDF (250 kB)
Construction of a Celestial Coordinate Reference Frame from VLBI Data
O. A. Titov
pp. 941-948 Full Text: PDF (220 kB)
Current Helicity and the Small-Scale Dynamo
A. S. Gabov and D. D. Sokoloff
pp. 949-953 Full Text: PDF (147 kB)
Pulsating Evershed Flows and Propagating Waves in a Sunspot
N. I. Kobanov and D. V. Makarchik
pp. 954-964 Full Text: PDF (621 kB)Archived web conten
Polycyclic aromatic compounds in soil of Antarctic / E. V. Abakumov, E. D. Lodigin, D. N. Gabov, V. A. Krylenkov
No full textПоведены исследования накопления ПАУ в почвах Антарктиды. Пул полиаренов в изученных почвах представлен, главным образом, легкими ПАУ – нафталином, фенантреном, флуорантеном, пиреном и др. В процессе загрязнения изменяется состав ПАУ в почвах – происходит количественное накопление, как легких, так и тяжелых ПАУ при качественном увеличении доли тяжелых полиаренов. Содержание бенз(а)пирена во всех почвах исследованных не превышала уровня предельно допустимой концентрации. Проведенный первичный фактологический и статистический анализ данных позволил выявить, что загрязнение почв Антарктиды тяжелыми ПАУ находится в самой начальной стадии, не происходит устойчивого и статистически достоверного накопления ПАУ в почвах как маритимной, так и континентальной Антарктики. = Soils of Antarctic has been investigated with the special reference to the polycyclic aromatic compounds (PAHs) content in the fine earth. Data obtained shows that PAHs presented mainly by naphthalene, phenanthrene, fluoranthe and pyrene. Soil contamination affects the PAH composition, the heavy fraction of PAH shows the trends of accumulation. Maximum allowable concentration of benzo(a)pyrene are not exceeded in all soils investigated. The soil contamination in Antarctic is on initial stage. Data obtained could be used as a reference levels for future investigations
Polycyclic aromatic compounds in soil of Antarctic / E. V. Abakumov, E. D. Lodigin, D. N. Gabov, V. A. Krylenkov
No full textПоведены исследования накопления ПАУ в почвах Антарктиды. Пул полиаренов в изученных почвах представлен, главным образом, легкими ПАУ – нафталином, фенантреном, флуорантеном, пиреном и др. В процессе загрязнения изменяется состав ПАУ в почвах – происходит количественное накопление, как легких, так и тяжелых ПАУ при качественном увеличении доли тяжелых полиаренов. Содержание бенз(а)пирена во всех почвах исследованных не превышала уровня предельно допустимой концентрации. Проведенный первичный фактологический и статистический анализ данных позволил выявить, что загрязнение почв Антарктиды тяжелыми ПАУ находится в самой начальной стадии, не происходит устойчивого и статистически достоверного накопления ПАУ в почвах как маритимной, так и континентальной Антарктики. = Soils of Antarctic has been investigated with the special reference to the polycyclic aromatic compounds (PAHs) content in the fine earth. Data obtained shows that PAHs presented mainly by naphthalene, phenanthrene, fluoranthe and pyrene. Soil contamination affects the PAH composition, the heavy fraction of PAH shows the trends of accumulation. Maximum allowable concentration of benzo(a)pyrene are not exceeded in all soils investigated. The soil contamination in Antarctic is on initial stage. Data obtained could be used as a reference levels for future investigations
Accumulation of polycyclic aromatic hydrocarbons in hummocky tundra peatlands under climate change at high latitudes
No full textThe influence of the magnesium alloys microstructure on the cathodic hydrogen evolution
Get PDFSolubility of several transition metal chlorides (NiCl2, CrCl2, MoCl3, FeCl2) was measured in KCl-AlCl3 based melts. It was found that the solubility of studied metal chlorides depends on K : Al mole ratio. MoCl3 solubility decreases with increasing AlCl3 content. Solubility of CrCl2 and FeCl2 reaches maximum at K : Al ratio of 1 and decreases when this ratio either de-creases or increases. The dependence of NiCl2 solubility on K : Al mole ratio is V-shaped with the maximum near 0.9–0.95. The effect of temperature on solubility of transition metal chlorides in KCl-AlCl3 melts was also investigated. Increasing temperature does not alter the character of «solubility – K : Al mole ratio» dependences
Pollution of the snow surface with polycyclic aromatic hydrocarbons during the formation of frost
Get PDFWhen analyzing chemical compositions of snow the high variability of content of polycyclic aromatic hydrocarbons (PAHs) in snow cover between snowfalls is observed. Researchers explain this by concentrating of snow. However, another mechanism of atmospheric contamination of the snow cover surface is possible. It may be a precipitation of fine crystals of PAHs from the atmosphere in the composition of cryohydrates, which can form aerogenic anomalies on the snow surface at formation of hoarfrost. The process starts in the atmosphere during the interaction of finely dispersed crystals of PAHs with cloud supercooled drops. This results in the cryogenic concentration of solid particles of PAHs by way of formation of solid eutectic mixture – cryohydrates, which are a two-phase system consisting of a fine mixture of crystals of solid particles and ice. Evidence of their manifestation is the presence of the Forel hatching on the surface of the facets of the hoarfrost crystals appearing due to the different optical density of alternating zones, which consist of interpenetrating domains of crystallized solid aerosols and ice. At the same time, due to the presence of temperature inversion over the snow cover and its drying effect on the near-snow layer of air, a stable mass transport of water vapor down to the snow cover is formed, which can initiate the flow of fine cryohydrates from the PAHs. Therefore, the growth of atmospheric ice crystals, begun in the surface atmosphere, continues on the snow surface during formation of hoarfrost, thus creating a special nano-relief of snow cover. The paper presents the results of observations of changes in the concentration of individual PAHs in the upper 18 mm layer of snow at accumulation of the surface hoarfrost during a long period between snowfalls. Some micro-morphological features of the forms of skeletal rime micro-crystals are shown, with which an increase in the nano-roughness of the snow surface is associated, as well as the manifestation of the signal of the aerogenic PAH anomaly on the snow surface. Since the conditions for the formation of surface hoarfrost occur more often than for snowfalls, the hoarfrost may be an informative object of testing when detecting hydrocarbon contamination of snow cover during the intervals between snowfalls
Accumulation of Polycyclic Aromatic Hydrocarbons in Soils and Mosses of Southern Tundra at Different Distances from the Thermal Power Plant
No full text
