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Wyszukujesz frazę "Lebedev, A. O." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Justification for the body construction selection of the unmanned uninhabited underwater apparatus
    Autorzy:
    Lebedeva, M. P.
    Lebedev, A. O.
    Butsanets, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/116035.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Autonomous Underwater Vessel (AUV)
    unmanned uninhabited underwater apparatus
    underwater object
    body construction
    Unmanned Underwater Vehicle (UUV)
    underwater apparatus
    hydrodynamics
    motion parameters
    Opis:
    The paper explores the possibility of creating an underwater apparatus in the form of a body of rotation. The form of the device will allow to effectively examine the found underwater objects, the bottom topography, measurement of other parameters of the underwater environment or objects. The devices of a different streamlined body form are considered. The apparatus in the form of a rotation body is proposed. The geometric shape of the proposed apparatus, the system of motion and control are investigated. Methods for calculating the motion parameters, methods for the vehicle positioning in the flow and the underwater vehicle movement in the vertical plane are proposed. The study confirms the ability of the underwater vehicle to move under water in a horizontal and vertical directions. The study confirms that the device possess stability at rectilinear motion, good turning ability and at the same time it is able to position itself during the flow.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 4; 693-697
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The revision of 'Cladodus' occidentalis, a Late Paleozoic ctenacanthiform shark
    Autorzy:
    Ginter, M
    Ivanov, A.
    Lebedev, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/20599.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Carboniferous
    Cladodus mirabilis
    Paleozoic
    Late Paleozoic
    Permian
    tooth
    Ctenacanthiformes
    Glikmanius occidentalis
    paleontology
    Chondrichthyes
    Opis:
    The teeth of a well known late Palaeozoic cladodont chondrichthyan, “Cladodus” occidentalis from Russia, USA, and England are restudied and a new generic name, Glikmanius gen. nov., is proposed for this species. Yet another tooth−based species, formerly described as ?Symmorium myachkovensis, occurring on the Russian Platform and in Nebraska, is considered to belong to the newly erected genus. Although there is no direct evidence that Glikmanius possessed fin spines, the broad similarity between its teeth and those of Ctenacanthus compressus suggests it had a ctenacanthiform affinity. The possible relationships between Glikmanius, Cladodus sensu stricto, “Ctenacanthus” costellatus, and Heslerodus, are suggested. However, the proposition put forward by an earlier author that the teeth of Heslerodus might represent the lower jaw dentition of G. myachkovensis, is rejected. The overall resemblance of Glikmanius teeth and those of Cladoselache and Squatinactis is recognised as convergent.
    Źródło:
    Acta Palaeontologica Polonica; 2005, 50, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chondrichthyan spines from the Famennian (Upper Devonian) of Russia
    Autorzy:
    Lebedev, Oleg A.
    Ivanov, Alexander O.
    Linkevich, Valeriy V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1835588.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chondrichthyes
    Ctenacanthiformes
    Euselachii
    Fin spines
    Famennian
    Devonian
    Russia
    ryby chrzęstnoszkieletowe
    famen
    dewon
    Rosja
    Opis:
    Very rare chondrichthyan spines from the Famennian (Upper Devonian) of European Russia are referred here to ctenacanthiforms, euselachians and a chondrichthyan group of uncertain systematic position. Ctenacanthus Agassiz, 1837 is recorded from the lower and middle Famennian of the central and north-western parts of the area. Sculptospina makhlaevi Lebedev gen. et sp. nov. originates from the lower Famennian of the Lipetsk Region. The holotype of ‘Ctenacanthus’ jaekeli Gross, 1933 and a new specimen from the upper Famennian of the South Urals are shown to belong to the same taxon, which is transferred to Acondylacanthus St. John and Worthen, 1875. New specimens of Tuberospina nataliae Lebedev, 1995 from the upper Famennian of Central Russia are described in detail. The newly presented material increases our knowledge of the composition of Famennian marine assemblages from the East European Platform. It is suggested that these assemblages may be classified as chondrichthyan-dominated and dipnoan-dominated. Hypothetically, after the end- Devonian Hangenberg extinction event, which affected numerous secondary consumers in vertebrate communities, some chondrichthyan groups could have encroached to take advantage of previously occupied ecological niches. Ctenacanthus, as well as Acondylacanthus and Amelacanthus survived the end-Devonian mass extinction to continue into the Carboniferous.
    Źródło:
    Acta Geologica Polonica; 2020, 70, 3; 339-362
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chondrichthyan spines from the Famennian (Upper Devonian) of Russia
    Autorzy:
    Lebedev, Oleg A.
    Ivanov, Alexander O.
    Linkevich, Valeriy V.
    Powiązania:
    https://bibliotekanauki.pl/articles/139186.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chondrichthyes
    Ctenacanthiformes
    Euselachii
    Fin spines
    Famennian
    Devonian
    Russia
    ryby chrzęstnoszkieletowe
    famen
    dewon
    Rosja
    Opis:
    Very rare chondrichthyan spines from the Famennian (Upper Devonian) of European Russia are referred here to ctenacanthiforms, euselachians and a chondrichthyan group of uncertain systematic position. Ctenacanthus Agassiz, 1837 is recorded from the lower and middle Famennian of the central and north-western parts of the area. Sculptospina makhlaevi Lebedev gen. et sp. nov. originates from the lower Famennian of the Lipetsk Region. The holotype of ‘Ctenacanthus’ jaekeli Gross, 1933 and a new specimen from the upper Famennian of the South Urals are shown to belong to the same taxon, which is transferred to Acondylacanthus St. John and Worthen, 1875. New specimens of Tuberospina nataliae Lebedev, 1995 from the upper Famennian of Central Russia are described in detail. The newly presented material increases our knowledge of the composition of Famennian marine assemblages from the East European Platform. It is suggested that these assemblages may be classified as chondrichthyan-dominated and dipnoan-dominated. Hypothetically, after the end- Devonian Hangenberg extinction event, which affected numerous secondary consumers in vertebrate communities, some chondrichthyan groups could have encroached to take advantage of previously occupied ecological niches. Ctenacanthus, as well as Acondylacanthus and Amelacanthus survived the end-Devonian mass extinction to continue into the Carboniferous.
    Źródło:
    Acta Geologica Polonica; 2020, 70, 3; 339-362
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Microscopy and X-ray Structural Investigations of Incommensurate Spin-Ladder Sr$\text{}_{4.1}$Ca$\text{}_{4.7}$Bi$\text{}_{0.3}$Cu$\text{}_{17}$O$\text{}_{29}$ Single Crystals
    Autorzy:
    Dłużewski, P.
    Pietraszko, A.
    Kozłowski, M.
    Szczepańska, A.
    Górecka, J.
    Baran, M.
    Leonyuk, L.
    Babonas, G.-J.
    Lebedev, O.
    Szymczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014560.pdf
    Data publikacji:
    2000-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Nn
    61.72.Mm
    74.72.-h
    61.16.Bg
    61.10.-i
    Opis:
    Transmission electron microscopy and X-ray diffraction proved chain ladder incommensurate single crystal structure of investigated samples. The incommensurate ratio was determined from the X-ray and electron diffraction being equal to 0.704. Diffuse scattering intensities localised on the planes perpendicular to the c*-axis and passing through the spots originating from the periodicity of chain sublattice were detected. High-angle grain boundary or twinning formed by rotation of 33.3° around [100] direction was observed. High-resolution electron microscopy images revealed the stacking faults in ac planes.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 6; 729-737
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Studies of Thermally Activated Vertical Hole Transport in ZnCdSe/ZnSSe Superlattice
    Autorzy:
    Lebedev, A.
    Sorokin, S.
    Toropov, A.
    Shubina, T.
    Il'inskaya, N.
    Nekrutkina, O.
    Ivanov, S.
    Pozina, G.
    Bergman, P.
    Monemar, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1991641.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Hf
    78.45.+h
    71.35.-y
    78.47.+p
    72.80.Ey
    Opis:
    Miniband transport in alternatively-strained ZnCdSe/ZnSSe short period superlattices is investigated using a structure with an enlarged quantum well. Temperature dependences of time-resolved and continuous wave photoluminescence have been measured, demonstrating an efficient temperature-induced vertical hole transport. A quantitative description is given for the carrier kinetics in these structures.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 421-426
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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