Observational study of UGC 4892—a candidate for polar-ring galaxies     

V. A. Hagen-Thorn  L. V. Shalyapina  G. M. Karataeva  V. A. Yakovleva 《Astronomy Letters》2003,29(3):133-141

We present the results of photometric and spectroscopic observations of UGC 4892—a candidate for polar-ring galaxies. We show that the feature in the brightness distribution described by Whitmore et al. (1990) as a possible polar ring is actually a companion galaxy that interacts with the giant main galaxy. The velocity fields of the gas and stellar components can be explained by assuming that the gas lost by the companion galaxy and captured by the main galaxy forms a gaseous stream rotating around the latter in a plane almost perpendicular to its principal plane.  相似文献   

Intelligent Visualisation and Information Presentation for Civil Crisis Management   总被引：1，自引：0，他引：1  

Natalia Andrienko  Gennady Andrienko 《Transactions in GIS》2007,11(6):889-909

This paper describes an ongoing research work on developing methods for effective visualisation support for situation analysis, decision making, and communication in the course of disaster management. The major goals are to reduce the information load of the analyst, decision maker, or information recipient without omission of anything important and to ensure quick and accurate comprehending of the information. The work embraces the issues of selection of the relevant information and defining the appropriate level of detail, data preparation (aggregation and other transformations), and selection of the appropriate methods for visual representation depending on the user's tasks or communication goals, recipient's profile, and the target presentation medium. A practical outcome from the research will be a knowledge base that can be used to support analysis, decision making, and information communication in emergency situations. A great part of the knowledge, specifically, knowledge on data transformation and representation, is generic and can be used for different applications.  相似文献   

Silver sulfotellurides from volcanic-hosted massive sulfide deposits in the Southern Urals     

K. A. Novoselov  E. V. Belogub  V. V. Zaykov  V. A. Yakovleva 《Mineralogy and Petrology》2006,87(3-4):327-349

Summary This paper addresses Ag-sulfotellurides occurring in volcanic-hosted massive sulfide deposits of the Southern Urals. Cervelleite-like minerals were identified in ores from the Gayskoe, Yaman-Kasy, Severo-Uvaryazhskoe, Tash-Tau, and Babaryk deposits, where they occur in ores containing chalcopyrite, galena, sphalerite, tennantite ± bornite. Other Ag- and Te-bearing minerals (electrum, hessite, stromeyerite and Ag-bearing chalcocite) are present in the association. A benleonardite-like mineral associated with sylvanite and native tellurium was found as a metastable phase in paleohydrothermal tubes relics from the Yaman-Kasy deposit. Formation of the sulfotellurides indicates relative low fTe₂ in the hydrothermal systems, insufficient for formation of most S-free tellurides. The significant Cu enrichment in cervelleite relates to the association with bornite. Broad variations in composition and physical properties of cervelleite-like sulfotellurides allow the supposition of the presence of several, as yet unnamed mineral species, which can be distinguished by Cu contents, Te/S ratios, and presumably by crystal structure.  相似文献   

Early Paleozoic granitoids of the Aqtau-Dzungar microcontinent (Central Kazakhstan)     

K. E. Degtyarev  K. N. Shatagin  A. B. Kotov  E. B. Sal&#;nikova  M. V. Luchitskaya  S. Z. Yakovleva  Yu. V. Plotkina  A. M. Fedoseenko 《Doklady Earth Sciences》2006,411(8):1204-1208

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Duration of migmatite formation in the granulite-facies metamorphism zone of Svecofennides of the Ladoga region, southeastern Baltic Shield     

Sh. K. Baltybaev  O. A. Levchenkov  Corresponding Member of the RAS V. A. Glebovitsky  L. K. Levskii  E. V. Kuz’mina  A. F. Makeev  S. Z. Yakovleva 《Doklady Earth Sciences》2006,407(1):271-274

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Early Cretaceous age of regional metamorphism of the Stanovoi group in the Dzhugdzhur-Stanovoi foldbelt: Geodynamic implications     

A. M. Larin  E. B. Sal’nikova  A. B. Kotov  V. A. Glebovitsky  S. D. Velikoslavinsky  A. A. Sorokin  S. Z. Yakovleva  A. M. Fedoseenko  I. V. Anisimova 《Doklady Earth Sciences》2006,409(1):727-731

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Paleoproterozoic gabbroanorthosites of the Selenga-Stanovoi Superterrane, southern framing of the Siberian Craton     

I. V. Buchko  E. B. Sal’nikova  A. B. Kotov  A. M. Larin  S. D. Velikoslavinskii  A. A. Sorokin  A. P. Sorokin  S. Z. Yakovleva 《Doklady Earth Sciences》2006,407(2):372-375

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Contribution of alkaline granite magmatism to the formation of the Khangai batholith: Geological and geochronological evidence     

V. V. Yarmolyuk  A. M. Kozlovsky  E. B. Sal’nikova  A. B. Kotov  A. V. Travin  I. K. Kozakov  V. P. Kovach  V. I. Lebedev  S. Z. Yakovleva  I. V. Anisimova  G. Eenjin 《Doklady Earth Sciences》2013,452(2):992-996

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Primary petrology,mineralogy and age of the Letšeng-la-Terae kimberlite (Lesotho,Southern Africa) and parental magmas of Group-I kimberlites     

Natalia?StammEmail authorView author&#;s OrcID profile  Max?W.?Schmidt  Dawid?Szymanowski  Albrecht?von?Quadt  Thabang?Mohapi  Andre?Fourie 《Contributions to Mineralogy and Petrology》2018,173(9):76

The Let?eng-la-Terae kimberlite (Lesotho), famous for its large high-value diamonds, has five distinct phases that are mined in a Main and a Satellite pipe. These diatreme phases are heavily altered but parts of a directly adjacent kimberlite blow are exceptionally fresh. The blow groundmass consists of preserved primary olivine with Fo_86?88, chromite, magnesio-ulvöspinel and magnetite, perovskite, monticellite, occasional Sr-rich carbonate, phlogopite, apatite, calcite and serpentine. The bulk composition of the groundmass, extracted by micro-drilling, yields 24–26 wt% SiO₂, 20–21 wt% MgO, 16–19 wt% CaO and 1.9–2.1 wt% K₂O, the latter being retained in phlogopite. Without a proper mineral host, groundmass Na₂O is only 0.09–0.16 wt%. However, Na-rich K-richterite observed in orthopyroxene coronae allows to reconstruct a parent melt Na₂O content of 3.5–5 wt%, an amount similar to that of highly undersaturated primitive ocean island basanites. The groundmass contains 10–12 wt% CO₂, H₂O is estimated to 4–5 wt%, but volatiles and alkalis were considerably reduced by degassing. Mg# of 77.9 and 530 ppm Ni are in equilibrium with olivine phenocrysts, characterize the parent melt and are not due to olivine fractionation. ⁸⁷Sr/⁸⁶Sr_(i)?=?0.703602–0.703656, ¹⁴³Nd/¹⁴⁴Nd_(i)?=?0.512660 and ¹⁷⁶Hf/¹⁷⁷Hf_(i)?=?0.282677–0.282679 indicate that the Let?eng kimberlite originates from the convective upper mantle. U–Pb dating of groundmass perovskite reveals an emplacement age of 85.5?±?0.3 (2σ) Ma, which is significantly younger than previously proposed for the Let?eng kimberlite.  相似文献   

Age and Boundaries of the Olekma Magmatic Belt of the Selenga–Stanovoi Superterrane (Central Asian Mobile Belt)     

V.?P.?KovachEmail author  A.?B.?Kotov  A.?M.?Larin  E.?B.?Sal’nikova  S.?D.?Velikoslavinskii  S.?Z.?Yakovleva  Yu.?V.?Plotkina 《Doklady Earth Sciences》2018,483(1):1375-1379

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