437 research outputs found
Chondrichthyan spines from the Famennian (Upper Devonian) of Russia
No full text© 2020 Polish Academy of Sciences. All rights reserved. Lebedev, O.A., Ivanov, A.O. and Linkevich, V.V. 2020. Chondrichthyan spines from the Famennian (Upper Devonian) of Russia. Acta Geologica Polonica, 70 (3), 339–362. Warszawa. 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
Measurement of the time-dependent CP asymmetry in B0 -> J/ψ KS0 decays
No full textThis Letter reports a measurement of the CP violation observables SJ/ψK0S and CJ/ψK0S in the decay channel B0→J/ψK0S performed with 1.0 fb−1 of pp collisions at s√=7 TeV collected by the LHCb experiment. The fit to the data yields SJ/ψK0S=0.73±0.07(stat)±0.04(syst) and CJ/ψK0S=0.03±0.09(stat)±0.01(syst). Both values are consistent with the current world averages and within
expectations from the Standard Model
Correction: Strokova et al. Interaction Mechanisms in «Portland Cement—Functional Polymer Mineral Additives» Binder Produced by Different Methods. Materials 2025, 18, 3178
No full textMikhail Lebedev was not included as an author in the original publication [...
First observation of Bs → J/ψf0(980) decays
No full textUsing data collected with the LHCb detector in proton–proton collisions at a centre-of-mass energy of 7 TeV, the hadronic decay is observed. This CP eigenstate mode could be used to measure mixing-induced CP violation in the system. Using a fit to the π+π− mass spectrum with interfering resonances gives . In the interval ±90 MeV around 980 MeV, corresponding to approximately two full f0 widths we also find , where in both cases the uncertainties are statistical and systematic, respectively
Author Correction: Local Josephson vortex generation and manipulation with a Magnetic Force Microscope (Nature Communications, (2019), 10, 1, (4009), 10.1038/s41467-019-11924-0)
No full text© 2019, The Author(s). The original version of this Article contained an error in the spelling of the author Christophe Brun, which was incorrectly given as Chritophe Brun. Additionally this Article omitted from the author list the seventh author Nickolay Lebedev, who is from the ‘Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia’. These errors have now been corrected in both the PDF and HTML versions of the Article
Complex stress state of materials and structural elements and strength criteria: the scientific business card of Academician A.O. Lebedev
No full text1 лютого наукова громадськість відзначає 90 років від дня народження видатного українського вченого в галузі механіки деформівного твердого тіла, лауреата Державної премії СРСР (1982), Державної премії України в
галузі науки і техніки (1997), заслуженого діяча науки і техніки України
(2001), лауреата премій НАН України ім. С.П. Тимошенка (2004) та
ім. Г.С. Писаренка (2011), доктора технічних наук (1972), професора
(1976), академіка НАН України (1988) Анатолія Олексійовича Лебедєва.On February 1, the scientific community celebrates the 90th anniversary of a prominent Ukrainian scientist in the field
of deformable solid mechanics, laureate of the USSR State Prize (1982), the State Prize of Ukraine in Science and
Technology (1997), Honored Worker of Science and Technology of Ukraine (2001), laureate of S.P. Tymoshenko (2004)
and G.S. Pysarenko (2011) Prizes of the NAS of Ukraine, Doctor of Technical Sciences (1972), Professor (1976),
Academician of the NAS of Ukraine (1988) Anatoliy O. Lebedev
Measurement of the D+/- production asymmetry in 7 TeV pp collisions
No full textThe asymmetry in the production cross-section \sigma of D+/- mesons, A_P = (\sigma(D+) - \sigma(D-))/(\sigma(D+) + \sigma(D-)), is measured in bins of pseudorapidity \eta and transverse momentum p_T within the acceptance of the LHCb detector. The result is obtained with a sample of D+ -> K_S pi+ decays corresponding to an integrated luminosity of 1.0 fb^-1, collected in pp collisions at a centre of mass energy of 7 TeV at the Large Hadron Collider. When integrated over the kinematic range 2.0 K_S pi+ decay is negligible. No significant dependence on \eta or p_T is observed
Anna Colin Lebedev, Le cœur politique des mères, Analyse du mouvement des mères de soldats en Russie
No full textIn this valuable piece of sociological research Anna Colin Lebedev scrutinizes the modus operandi of a non‑governmental organisation of women activists taking on the essentially male domain of the military authorities in post‑Soviet Russia. With no dearth of academic studies stressing the lack of effective action from below in modern Russia, the author deems the Union of Committees of Soldiers’ Mothers of Russia atypical, based on its assistance for over twenty years to individual families wh..
Analysis of methods for calculating spur gear for deep contact strength
No full textSpur gear is an integral part of transport and technological machines structure. To increase the load ability of the spur gear, chemical heat treatment of the working cogs surfaces is used. Spur gear with chemical heat treatment must be checked for deep contact strength. The article analyzes various methods (according to GOST 21354-87, methods using the generalized criterion of the limit state for structurally inhomogeneous material by Lebedev-Pisarenko, methods from the handbook describing reducers of power machines etc.) for calculating spur and helical gearing for deep contact strength. The author presents all necessary formulas and graphs for the implementation of each methods, and compares the calculations results of these methods with the results of experimental studies of cemented cylindrical rollers for deep contact destruction
Opposition journalist in pre-revolutionary Russia: worker of newspaper “Golos Urala” F. Lebedev (F. Sibirsky) during the election campaign to IV State Duma
No full textСтатья поступила в редакцию 27.05.2014 г.Статья посвящена роли оппозиционного журналиста в системе средств массовой информации Российской империи. В качестве примера взята деятельность секретаря редакции газеты «Голос Урала» Ф. Н. Лебедева (Ф. Сибирского) в период избирательной кампании в IV Государственную думу. На основе изучения публикаций Ф. Н . Л ебедева показано, как он использовал возможности легального периодического издания для изложения взглядов радикальной оппозиции на существовавшую в стране социально-политическую систему.Article is devoted to the role of the opposition journalist in media system of the Russian Empire. An activity of the executive assistant of the newspaper “Golos Urala” F. Lebedev (F. Sibirsky) during the election campaign to IV State Duma is used as an example. With the help of the study of publications by F. Lebedev the author proves us how the possibility of legal periodicals were used in order to expose the views of the radical opposition
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