Optical Spectroscopy of SRG/eROSITA Objects with 2.5-m Telescope at the Caucasus Mountain Observatory of the SAI MSU     

Dodin  A. V.  Potanin  S. A.  Shatsky  N. I.  Belinski  A. A.  Atapin  K. E.  Burlak  M. A.  Egorov  O. V.  Tatarnikov  A. M.  Postnov  K. A.  Belvedersky  M. I.  Burenin  R. A.  Gilfanov  M. R.  Medvedev  P. S.  Meshcheryakov  A. V.  Sazonov  S. Yu.  Khorunzhev  G. A.  Sunyaev  R. A. 《Astronomy Letters》2020,46(7):429-438

Astronomy Letters - Based on observations with the new transient double-beam spectrograph (TDS) at the 2.5-m telescope of the Caucasus Mountain Observatory of SAI MSU, we have determined the types...  相似文献   

LA‐ICP‐MS Pb isotope test of meteorite provenance: A terrestrial origin for Lovina     

Christopher R. J. Charles  Phil J. A. McCausland  Donald W. Davis 《Meteoritics & planetary science》2020,55(5):1093-1102

Lovina, classified as an ungrouped ataxite, is controversial and its identity as a meteorite has been questioned. In this work, we use Pb isotopes on targeted troilite nodules in Lovina as a test of its antiquity and provenance. Although precise ages cannot be obtained, LA‐ICP‐MS offers a rapid, straightforward procedure to establish the source of lead, whether ancient (meteoritic) or modern (terrestrial). For nine pristine, unweathered nodules in Lovina, we find a lead isotopic composition of: ²⁰⁶Pb/²⁰⁸Pb = 0.492 ± 0.003 (2σ, MSWD 0.79; 95%) and ²⁰⁷Pb/²⁰⁶Pb = 0.852 ± 0.003 (2σ, MSWD 1.09; 95%) with no detectable uranium. All lead compositions of the troilite fall in the range expected for modern environmental and mantle lead and are distinctly different from the primordial Canyon Diablo Troilite (CDT) composition of ancient meteoritic troilite. Although the origin of Lovina remains unknown, we conclude that lead in the Lovina troilite is unsupported by U decay and originated from a terrestrial source.  相似文献   

Cognitive and Affective Predictors of Illinois Residents’ Perceived Risks from Gray Wolves     

Adam C. Landon  Maarten H. Jacobs  Craig A. Miller  Jerry J. Vaske  Brent D. Williams 《社会与自然资源》2020,33(5):574-593

Abstract

Increasing wolf populations are a concern for wildlife managers in the Midwestern U.S. Understanding the psychological mechanisms that contribute to public perceptions of risk will enable development of strategies that seek to mitigate these risks, and suggest where outreach efforts may facilitate acceptance of wolves. We examined the psychological factors that influence Illinois residents’ perceived risks from wolves. We hypothesized that individuals’ perceived risks from wolves were a function of their attitudes toward wolves, negative affect toward wolves, and basic beliefs about wildlife. Data were obtained from a survey of the Illinois public (n?=?784). Negative affect and attitudes toward wolves were direct predictors of perceived risks. Basic beliefs predicted attitudes and negative affect toward wolves. Negative affect predicted attitudes. Basic beliefs had direct and indirect effects on perceived risks.  相似文献   

Current Levels of Artificial Radioisotopes in Biota from the Arctic Continental Shelf (2013–2018)     

Matishov  G. G.  Ilyin  V. G.  Usyagina  I. S.  Valuyskaya  D. A.  Kirillova  E. E. 《Doklady Earth Sciences》2020,494(1):730-734

Doklady Earth Sciences - This paper analyzes data on the concentration and dynamics of 137Cs and 90Sr in marine organisms on the Arctic shelf under modern conditions (2013–2018). It is shown...  相似文献   

Variability of Extra Tropical Atmospheric Circulation and Periodic Trajectories in Simplified Models of Atmospheric Dynamics     

Gritsun  A. S. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(3):229-240

Izvestiya, Atmospheric and Oceanic Physics - The possibility for approximate basic statistical characteristics of atmospheric models using periodic trajectories (closed solutions of equations of...  相似文献   

Satellite Monitoring of Wildfires and Emissions into the Atmosphere of Combustion Products in Russia: Relation to Atmospheric Blockings     

Mokhov  I. I.  Bondur  V. G.  Sitnov  S. A.  Voronova  O. S. 《Doklady Earth Sciences》2020,495(2):921-924

Doklady Earth Sciences - Using satellite and reanalysis data, estimates of the significant relationship between the wildfire areas and associated pyrogenic emissions of combustion products with...  相似文献   

Recent Tectonic Rupturing on the Mud Volcano of Mount Karabetova,Taman Peninsula     

Ovsyuchenko  A. N.  Larkov  A. S.  Sysolin  A. I.  Rogozhin  E. A.  Sobisevich  A. L.  Chen  J.  Liu  J.  Qin  J. 《Doklady Earth Sciences》2020,492(1):361-365

Doklady Earth Sciences - In October 2019, extremely impressive, fresh ruptures of the surface on the mud volcano of Mount Karabetova were discovered. The ruptures are represented by all the main...  相似文献   

First Find of Platinum in Cosmogenic Spherules of Ferromanganese Crusts (Fedorov Guyot,Magellan Seamounts,Pacific Ocean)     

Savelyev  D. P.  Khanchuk  A. I.  Savelyeva  O. L.  Moskaleva  S. V.  Mikhailik  P. E. 《Doklady Earth Sciences》2020,491(2):199-203

Doklady Earth Sciences - More than 250 magnetic spherules 40–200 µm in size were mechanically separated from a ferromanganese crust sample of Fedorov Guyot in the Magellan Seamounts. The...  相似文献   

Mesoscale Variability of the Ocean in the Northern Part of the Weddell Sea     

Morozov  E. G.  Frey  D. I.  Polukhin  A. A.  Krechik  V. A.  Artemiev  V. A.  Gavrikov  A. V.  Kasian  V. V.  Sapozhnikov  F. V.  Gordeeva  N. V.  Kobylyansky  S. G. 《Oceanology》2020,60(5):573-588

Oceanology - Results of a mesoscale survey in the Powell Basin in the northern part of the Weddell Sea are analyzed. The survey included 24 CTD casts (6 × 4) with an interval of six nautical...  相似文献   

Comparative geochemical study of the cherty rocks of the Taukha terrane (Sikhote-Alin) and its paleogeodynamic significance     

Kemkin  Igor V.  Kemkina  Raisa A. 《中国地球化学学报》2020,39(4):539-560

Acta Geochimica - The article presents the results of a comparative geochemical study of cherts and siliceous–clayey rocks composing the tectono-sedimentary complexes of various structural...  相似文献