Development of Methods for Navigational Referencing of Circumlunar Spacecrafts to the Selenocentric Dynamic Coordinate System     

Andreev  A. O.  Nefedyev  Yu. A.  Demina  N. Yu.  Nefediev  L. A.  Petrova  N. K.  Zagidullin  A. A. 《Astronomy Reports》2020,64(9):795-803

Astronomy Reports - The initial form of present-day space optical observations contain considerable geometrical and brightness distortions. This problem can be solved based on geometrical...  相似文献   

Peculiarities of Water Circulation in the Southern Tatar Strait     

Andreev  A. G. 《Izvestiya Atmospheric and Oceanic Physics》2018,54(9):1050-1056

Izvestiya, Atmospheric and Oceanic Physics - Satellite altimetry data have been used to study water circulation in the Tatar Strait region (the northern part of the Sea of Japan) for the time...  相似文献   

Mesoscale Circulation of Waters in the Region of the East Sakhalin Current (the Sea of Okhotsk)     

Andreev  A. G. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(12):1628-1637

Izvestiya, Atmospheric and Oceanic Physics - The mesoscale circulation of waters in the East Sakhalin Current region (the western Sea of Okhotsk) is studied for the period of 1993 to 2014 using...  相似文献   

Physical Libration of the Moon: An Extended Problem     

Zagidullin  A. A.  Usanin  V. S.  Petrova  N. K.  Nefedyev  Yu. A.  Andreev  A. O.  Gudkova  T. V. 《Astronomy Reports》2020,64(12):1093-1106

Astronomy Reports - The work is devoted to the study of the physical libration of the Moon. Interest in the traditional topic related to the rotation of the Moon is stirred up by the activity of...  相似文献   

The κ-Cygnid Meteor Shower and Its Relationship with Near-Earth Asteroids     

Sergienko  M. V.  Sokolova  M. G.  Nefedyev  Yu. A.  Andreev  A. O. 《Astronomy Reports》2020,64(12):1087-1092

Astronomy Reports - This study is focused on the relationships between the κ-Cygnid meteor shower and different groups of asteroids crossing the Earth’s orbit (the so-called near-Earth...  相似文献   

Analysis of Latitude Observations and Data of Satellite Navigation Systems to Determine Geodynamic Parameters     

Mubarakshina  R. R.  Lapaeva  V. V.  Kashcheev  R. A.  Zagretdinov  R. V.  Nefedyev  Y. A.  Andreev  A. O. 《Astronomy Reports》2021,65(3):224-232

Astronomy Reports - This study is focused on the analysis of data of the long-term latitude observations and the Global Navigation Satellite System (GNSS). The latitude observations include...  相似文献   

Analysis of Photoelectric Occultations and Development of a Digital Model of the Lunar Libration Zone     

Churkin  K. O.  Nefedyev  Yu. A.  Andreev  A. O.  Demina  N. Yu.  Kronrod  E. V. 《Astronomy Reports》2021,65(7):580-587

Astronomy Reports - One of the priority tasks of modern astronomy is the observation and study of transient celestial processes, which also concerns photoelectric observations of lunar occultations...  相似文献   

Results of the Study of Zircon (SIMS) from Granitoids of the Konstantinovskii Stock (Area of the Sukhoi Log Gold Deposit): Age,Sources, and Geological Consequences     

Rytsk  E. Yu.  Tolmacheva  E. V.  Velikoslavinsky  S. D.  Kuznetsov  A. B.  Rodionov  N. V.  Andreev  A. A.  Fedoseenko  A. M. 《Doklady Earth Sciences》2021,496(2):146-150

Doklady Earth Sciences - The results of U–Pb geochronological (SIMS) study of zircons from granitoids of the Konstantinovskii Stock located 6 km from the Sukhoi Log gold deposit are reported....  相似文献   

A photometric study of the polar MT draconis in 2005–2009     

A. M. Zubareva  E. P. Pavlenko  M. V. Andreev  S. V. Antipin  N. N. Samus’  A. V. Sergeev 《Astronomy Reports》2011,55(3):224-229

We have obtained data on various brightness states of the polar MT Dra over five years of observations, including the first multicolor photometry for this close binary. We confirm the known orbital period, which has remained constant over 17 years, which is unusual for cataclysmic binaries. Our observations in October 2006 demonstrated a transition of the polar to its low brightness state within one day.  相似文献   

Vegetation and climate changes in northwestern Russia during the Lateglacial and Holocene inferred from the Lake Ladoga pollen record     

Larisa A. Savelieva  Andrei A. Andreev  Raphael Gromig  Dmitry A. Subetto  Grigory B. Fedorov  Volker Wennrich  Bernd Wagner  Martin Melles 《Boreas: An International Journal of Quaternary Research》2019,48(2):349-360

The new pollen record from the upper 12.75 m of a sediment core obtained in Lake Ladoga documents regional vegetation and climate changes in northwestern Russia over the last 13.9 cal. ka. The Lateglacial chronostratigraphy is based on varve chronology, while the Holocene stratigraphy is based on AMS ¹⁴C and OSL dates, supported by comparison with regional pollen records. During the Lateglacial (c. 13.9–11.2 cal. ka BP), the Lake Ladoga region experienced several climatic fluctuations as reflected in vegetation changes. Shrub and grass communities dominated between c. 13.9 and 13.2 cal. ka BP. The increase in Picea pollen at c. 13.2 cal. ka BP probably reflects the appearance of spruce in the southern Ladoga region at the beginning of the Allerød interstadial. After c. 12.6 cal. ka BP, the Younger Dryas cooling caused a significant decrease in spruce and increase in Artemisia with other herbs, indicative of tundra‐ and steppe‐like vegetation. A sharp transition from tundra‐steppe habitats to sparse birch forests characterizes the onset of Holocene warming c. 11.2 cal. ka BP. Pine forests dominated in the region from c. 9.0 to 8.1 cal. ka BP. The most favourable climatic conditions for deciduous broad‐leaved taxa existed between c. 8.1 and 5.5 cal. ka BP. Alder experiences an abrupt increase in the local vegetation c. 7.8 cal. ka BP. The decrease in tree pollen taxa (especially Picea) and the increase in herbs (mainly Poaceae) probably reflect human activity during the last 2.2 cal. ka. Pine forests have dominated the region since that time. Secale and other Cerealia pollen as well as ruderal herbs are permanently recorded since c. 0.8 cal. ka BP.  相似文献