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We present the results of MEGNO analysis of the long-term orbital evolution of uncontrolled objects of satellite radio navigation systems in medium Earth orbits and geostationary orbits. It is shown that secular resonances affecting these objects may give rise to dynamic randomness in their long-term orbital evolution. 相似文献
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We present the results of the study of long-term orbital evolution of space debris objects, formed from end-of-life space vehicles (SV) of satellite radio navigation systems in the medium Earth orbit (MEO) region. Dynamical features of the evolution of objects in this region have been studied on the basis of 20-year laser surveillance with the Etalon-1 and Etalon-2 satellites and the results of numerical simulation of the long-term evolution of operating and disposal orbits of uncontrolled GLONASS and GPS SVs. It is shown that perturbations from secular lunisolar resonances produce an eccentricity growth for orbits with inclinations chosen for navigation constellations; this significantly changes the positions of these orbits in space and results in the ingress of end-of-life objects into the area of operating SVs. 相似文献
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During the Moscovian Age, the eastern part of the Russian Platform was occupied by the shallow-water East European Basin (EEB) characterized by predominantly carbonate sedimentation. In the Cis-Ural region of this basin, the deep Cis-Ural Sea (CUS) occupied the Ural Foredeep. The Paleo-Ural Range separated the CUS from the narrow and long East Ural Gulf, which was connected in the south with the main part of the EEB and a sea within the Turan Plate. The Moscovian paleogeographic setting is shown in three paleogeographic maps. Middle Carboniferous organogenic buildups from the eastern slope of the Urals have been time and again described previously. However, the repeated study of these features did not prove the biogenic nature of all of them. This work presents characteristics of two, newly discovered, unique (in terms of nature and structure) coastal bioherms. One bioherm lies at the base of the Moscovian stage and consists of phylloid algae. The second bioherm, located at a higher level, has a complex structure and is made up of foraminifers, algae, and stromatolites. After the desiccation and development of karst features on the surface, the bioherm was buried under sandy–clayey sediments accumulated in freshened water. 相似文献
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Avdyushev V. A. Bordovitsyna T. V. Baturin A. P. Bakhtigaraev N. S. Levkina P. A. Popandopulo N. A. Saleiko K. V. Tomilova I. V. Chuvashov I. N. 《Solar System Research》2022,56(5):327-337
Solar System Research - The results are presented of a numerical simulation for the motion of a group of geosynchronous objects from positional observations obtained with the unique Zeiss-2000... 相似文献
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Based on the detailed biostratigraphic study of the entire polyfacies sedimentary complex in the Uralian foredeep, the distribution of Late Paleozoic (Middle Carboniferous-Permian) phosphate occurrences and phosphorite deposits is shown. Their genetic relation with the foredeep development and facies constraints are established. A new concept of genesis of the Asha and Dombar deposits is substantiated and the age of the Asha deposit is revised. Prospects of their industrial development are suggested. 相似文献
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A few of our predecessors considered the Eastern Siberian Region to be a huge territory with similar geological history without hydrocarbon prospecting opportunities. It was also proposed to search for oil and gas in the seas of the Arctic Ocean. Not denying these search directions, we have offered to explore the Western Siberian Region by analysis of numerous deep wells, variable facial zones of Paleozoic complexes, and real prospects of searching for oil and gas fields. 相似文献