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排序方式: 共有225条查询结果,搜索用时 125 毫秒
221.
Kiselev A. A. Rozanov E. V. Frolkis V. A. Smyshlyaev S. P. 《Izvestiya Atmospheric and Oceanic Physics》2022,58(2):111-120
Izvestiya, Atmospheric and Oceanic Physics - The contribution of Igor’ Leonidovich Karol’ to world and national science is described. Three stages of his scientific research are... 相似文献
222.
The orbits of the four visual binaries ADS 246 (GL 15), ADS 7724 (γ Leo), ADS 10386 (GJ 659), and ADS 14909 (1 Peg) have been determined using the apparent motion parameters (AMP) method. The orbital periods of these stars are 1200, 550, 7500, and 18 000 yr, respectively. The orbits were calculated based on observations along short arcs obtained with the 26-inch refractor of the Pulkovo Observatory and Hipparcos parallaxes, supplemented with radial-velocity measurements for the components of these pairs taken from the literature. All visual and photographic observations of these stars after 1830 from the WDS catalog have been taken into consideration. The new orbits of ADS 246 and ADS 7724 are compared with the orbits computed in other studies. The orbits of ADS 10386 and ADS 14909 have been determined for the first time. The orientation of the planes of the computed orbits in Galactic coordinates have also been calculated. 相似文献
223.
G. P. Kiselev E. Yu. Yakovlev S. V. Druzhinin A. S. Galkin 《Geology of Ore Deposits》2017,59(5):391-406
The contents of radioactive elements and the uranium isotopic composition of kimberlite in the Arkhangelskaya pipe at the M.V. Lomonosov deposit and of nearby country rocks have been studied. A surplus of 234U isotope has been established in rocks from the near-pipe space. The high γ = 234U/238U ratio is controlled by the geological structure of the near-pipe space. A nonequilibrium uranium halo reaches two pipe diameters in size and can be regarded as a local ore guide for kimberlite discovery. The rocks in the nearpipe space are also characterized by elevated or anomalous U, Th, and K contents with respect to the background. 相似文献
224.
Yu. V. Yashunskii S. A. Novikova V. K. Golubev I. A. Novikov A. A. Kiselev S. V. Grishin 《Lithology and Mineral Resources》2020,55(3):192-205
The article presents data on numerous findings of authigenic K-feldspars in the Lower–Upper Carboniferous carbonate and terrigenous rocks in the southern limb of the Moscow syneclise, including the Oka–Tsna bar. In terms of the composition and crystalline structure, all feldspar morphotypes (idiomorphic monocrystalline fringes on the surface of sandy clastic grains, fine-crystalline aggregates, pseudomorphously replacing organogenic carbonate detritus, and pseudoskeletal crystals) are composed of K-sanidine with the overwhelming predominance of K over Na and extremely low concentrations of Ca, Ba, and Sr. As can be seen from 40Ar/39Ar dating, the authigenic sanidine mineralization took place during the Permian, i.e., 20–55 Ma later than the accumulation of host Carboniferous rocks. Mineralogical observations, as well as paleofacies and paleogeographic reconstructions, suggest that the formation of authigenic K-feldspars is associated with the gravitation-brine catagenesis in the southern limb of the Moscow syneclise as a result of the seepage of high-mineralization brines from Permian evaporate marine basins into the underlying older rocks. 相似文献
225.
Annama H chondrite—Mineralogy,physical properties,cosmic ray exposure,and parent body history
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Tomáš Kohout Jakub Haloda Patricie Halodová Matthias M. M. Meier Colin Maden Henner Busemann Matthias Laubenstein Marc. W. Caffee Kees C. Welten Jens Hopp Mario Trieloff Ramakant R. Mahajan Sekhar Naik Josep M. Trigo‐Rodriguez Carles E. Moyano‐Cambero Michael I. Oshtrakh Alevtina A. Maksimova Andrey V. Chukin Vladimir A. Semionkin Maksim S. Karabanalov Israel Felner Evgeniya V. Petrova Evgeniia V. Brusnitsyna Victor I. Grokhovsky Grigoriy A. Yakovlev Maria Gritsevich Esko Lyytinen Jarmo Moilanen Nikolai A. Kruglikov Aleksey V. Ishchenko 《Meteoritics & planetary science》2017,52(8):1525-1541
The fall of the Annama meteorite occurred early morning (local time) on April 19, 2014 on the Kola Peninsula (Russia). Based on mineralogy and physical properties, Annama is a typical H chondrite. It has a high Ar‐Ar age of 4.4 Ga. Its cosmic ray exposure history is atypical as it is not part of the large group of H chondrites with a prominent 7–8 Ma peak in the exposure age histograms. Instead, its exposure age is within uncertainty of a smaller peak at 30 ± 4 Ma. The results from short‐lived radionuclides are compatible with an atmospheric pre‐entry radius of 30–40 cm. However, based on noble gas and cosmogenic radionuclide data, Annama must have been part of a larger body (radius >65 cm) for a large part of its cosmic ray exposure history. The 10Be concentration indicates a recent (3–5 Ma) breakup which may be responsible for the Annama parent body size reduction to 30–35 cm pre‐entry radius. 相似文献