Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Alexander A. Yefremov"'
Autor:
Alexander A. Yefremov, Kamol K. Kadyrov, Mikhail D. Noskov, Alexander A. Filipas, Alexander A. Shchipkov
Publikováno v:
Известия Томского политехнического университета: Инжиниринг георесурсов, Vol 335, Iss 10 (2024)
Relevance. A submersible electric motor is the most vulnerable component of an electric centrifugal pumping unit used in in-situ leaching uranium mining. The accuracy of calculating the need for new electric motors directly affects the profitability
Externí odkaz:
https://doaj.org/article/a77d5b762947430dbf571a5cca79cad2
Autor:
Spiros Cotsakis, Alexander P. Yefremov
Publikováno v:
Metaphysics. :59-65
Mathematical cosmology is that branch of theoretical physics where some of the most intricate, complex, and deeply unresolved issues lie. Beginning with the Einstein static universe in 1917, in this brief paper we freely float above all major develop
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5f732a1f615e6fe333391a003c6aeaa6
https://doi.org/10.22363/2224-7580-2022-1-59-65
https://doi.org/10.22363/2224-7580-2022-1-59-65
Autor:
Alexander P. Yefremov
Publikováno v:
The Sixteenth Marcel Grossmann Meeting.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b9d79b481fd3033a8fd4ddeb4341bafb
https://doi.org/10.1142/9789811269776_0045
https://doi.org/10.1142/9789811269776_0045
Publikováno v:
The Sixteenth Marcel Grossmann Meeting.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b73655480dd368c5e74e9a903747a68
https://doi.org/10.1142/9789811269776_0324
https://doi.org/10.1142/9789811269776_0324
Publikováno v:
Acta Astronautica. 186:438-444
The high sensitivity of a planet's gravity assist (GA) to changes in test-body impact parameter prompts a space experiment that tests the nature of gravitational fields in the solar system. The Sun, Earth, and Venus can serve as a space-borne laborat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97924861f6305975affe6fb0bd4c91c8
https://doi.org/10.1016/j.actaastro.2021.06.005
https://doi.org/10.1016/j.actaastro.2021.06.005
Autor:
Spiros Cotsakis, Alexander P. Yefremov
Publikováno v:
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. 380
We continue our overview of mathematical cosmology with a survey of the third and fourth periods of the development of the subject. The first Part includes the first two periods and is published separately. The third period (1980–2000) continues he
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2cc873d3264341d97f07168ac3213557
https://doi.org/10.1098/rsta.2021.0171
https://doi.org/10.1098/rsta.2021.0171
Publikováno v:
Acta Astronautica. 180:205-210
A planetary model simulating the Sun, Venus, and Earth is constructed with the possibility of “Venus” to render a gravity assist to a ballistic space probe sent from the Earth's orbit. Thorough analytical and numerical analysis shows that a shift
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d9b2588530e370030be337d060a3fe7a
https://doi.org/10.1016/j.actaastro.2020.12.029
https://doi.org/10.1016/j.actaastro.2020.12.029
Autor:
Alexander P. Yefremov
Publikováno v:
Gravitation and Cosmology. 26:118-123
We build a Kepler model of spacecraft gravity assist maneuver near a Venus-type planet and investigate its sensitivity to changes of the impact parameter. Analytical and numerical computations give similar results indicating a great increase of the t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f15ff8e428490ece45bb0770f0b59380
https://doi.org/10.1134/s0202289320020127
https://doi.org/10.1134/s0202289320020127
Autor:
Alexander P. Yefremov
Publikováno v:
Acta Astronautica. 168:44-56
The general relativistic (GR) impact is assessed on the precision of the announced BepiColombo (BC) space positions at the Earth, Venus and Mercury flyby points providing planned gravity-assists. Apart of the known elliptic orbit precession, another
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cdf52d6c932e94c460019f7ed5f68cf2
https://doi.org/10.1016/j.actaastro.2019.11.024
https://doi.org/10.1016/j.actaastro.2019.11.024
Autor:
Alexander A. Yefremov, Elena E. Luneva
Publikováno v:
Communications in Computer and Information Science ISBN: 9783030941406
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b9dbc3b32e46e63c663ff829720b4b2e
https://doi.org/10.1007/978-3-030-94141-3_18
https://doi.org/10.1007/978-3-030-94141-3_18
