457 research outputs found
Impact of gas suspension shielding layer on the force effect of shock waves on a rigid wall
No full textП.Е. Беляев, Н.Л. Клиначева,
Южно-Уральский государственный университет, г. Челябинск, Российская Федерация
E-mail: [email protected]. P.E. Belyaev, N.L. Klinacheva
South Ural State University, Chelyabinsk, Russian Federation
E-mail: [email protected]Приводится анализ влияния параметров экранирующего слоя на величину импульса избыточного давления, передаваемого на жёсткую неподвижную стенку ударной волной. Показано, что уменьшение диаметра частиц в экранирующем слое приводит к замедлению оттока газа от преграды,
что, в свою очередь, приводит к увеличению импульса избыточного давления. На основе численного эксперимента выработаны предложения по повышению эффективности экранирования с учётом описанного эффекта. The article deals with the analysis of influence of shielding layer parameters on the amount of excessive
pressure impulse translated on the fixed rigid wall by the shock wave. It is demonstrated that the
decrease in the diameter of particles in shielding layer leads to gas drainage from the barrier, which in
turn leads to the increase of excessive pressure impulse. The suggestions on increasing the shielding
efficiency are made based on the numerical experiment and taking into account the described effect
To the centenary of the birth of outstanding evolutionist Dmitri Konstantinovich Belyaev
No full textThis paper is a tribute to outstanding evolutionary biologist Dmitri Konstantinovich Belyaev in connection with the forthcoming centenary of his birth. His work on variation-related mechanisms in animal domestication made this process much faster. Belyaev is at length described as a person, as a scientist and as the organizer of the Institute of Cytology and Genetics of the Siberian Branch of the USSR Academy of Sciences. The author had for many years worked as Belyaev’s Deputy for Science, and, when Dmitri Konstantinovich passed away, had for 22 years headed the Institute of Cytology and Genetics. Belyaev’s life was not easy: he was a priest’s son and an “enemy of the people”’s brother. He was in the battlefield all through the Great Patriotic War and became a man of steel. His struggle for the restoration of genetics in the country, his commitment to setting up and maintaining relationships between masters and followers and many more other aspects of his life are considered. The global importance of the “master – follower” paradigm as a basis of the continuity of generations is underlined and re-underlined, for this is a very special point in the scientific community, especially when new schools of science emerge
A story about the discovery of the largest glacier and the highest peak in heart of the Pamirs
No full textThe paper tells a story how the “blank spot” at the Pamirs center was puzzled out. In 1878, a small party of explorers headed by V.D. Oshanin had found here a big glacier about 30–40 km long and named it for Fedchenko. In 1884–85, known investigator G.E. Grumm-Grzhimailo made his important proposal about orographic structure of the Pamirs central part. In 1890, expedition headed by topographer N.I. Kosinenko investigated the lower part of the Fedchenko Glacier and, for the first time, saw a separate high peak. In 1916, astronomer Ya.I. Belyaev had put on a map a great pyramidal summit but he had mistaken it for the Garmo Peak well known to local Tadzhiks (Fig. 2).In 1927, N.L. Korzhenevsky published a chart of arrangement of ridges near sources of the river Muksu (Fig. 3) that became a basis for work of the Tadzhik-Pamir expedition of 1928–1932. In 1928, Ya.I. Belyaev determined a true length of the Fechenko Glacier that was 70 km, and geodesist I.G. Dorofeevmapped the whole basin of this glacier (Fig. 4) including also a high irregular truncated pyramid of 7495 m in height (as he believed). But earlier this summit was identified as known the Garmo Peak. And only in 1932, it was established that definitions made by Dorofeev in 1928 were related to this highest peak of the Pamirs and also of the whole Soviet Union. The chart of real Central Pamir orography constructed by I.G. Dorofeev is presented in the paper together with his letter addressed to the author (Fig. 5).Thus, the “Garmo peaks” which were observed by the above mentioned explorers were actually three different summits. One of them does tower on the north of the “knot being puzzled out” and reaches 7495 m, and namely this “one-tooth” peak was repeatedly seen by N.V. Krylenko from valleys Gando and Garmo. It was named then the Stalin peak, and later – the peak of Communism. Another one is located in 18 km southward, and this peak is actually the true Garmo Peak 6595 m high known to local Tadzhik people. And the third summit is located between the two others, it is the Belyaev Peak 6852 m high that once Ya.I. Belyaev, and next N.L. Korzhenevsky confused as the Garmo Peak.So, at the beginning of 1930s, orography of the Central Pamirs had been finally ascertained. A group of distinguished well-known scientists and travelers of the first third of 20th century (Fig. 7) participated in this outstanding investigation that was followed by a number of geographical discoveries. And, the highest peak of the Pamirs does now bear the name Ismoil Somoni (Fig. 8)
Observation of J/ψ-pair production in pp collisions at √s=7 TeV
No full textThe production of J/ψ pairs in proton–proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of 37.5 pb−1 collected with the LHCb detector. The production cross-section for pairs with both J/ψ in the rapidity range 2 < yJ/ψ < 4.5 and transverse momentum pJ/ψ T <10 GeV/c is σJ/ψJ/ψ =5.1±1.0±1.1 nb, where the first uncertainty is statistical and the second systematic
Bishop Apollos (Belyaev) and Development of Vyatka Diocese in 1866—1885
No full textUsing mainly historical-comparative and historical-genetic methods, the issue of the development of the Vyatka and Slobodsk dioceses, which coincides within the borders with the Vyatka province, under Bishop Apollos (Belyaev), is considered in the article. The author pays special attention to the process of organizing religious, educational and missionary activities, and up to the appointment of Bishop Apollos, the results of this work were insignificant. The novelty of the research lies in the fact that for the first time it comprehensively examines the activities of the Vyatka Bishop Apollos in terms of the implementation of a nationwide religious course, which included active educational and missionary work of the local clergy. Under Bishop Apollos, to increase the influence of the clergy on the local population, including the Old Believers and non-Orthodox, important transformations were carried out: a separate vicariate was allocated in the diocese, the Vyatka Committee of the Orthodox Missionary Society and the Vyatka Brotherhood of St. Nicholas the Wonderworker were opened, and the work of the local clergy was also generally reorganized. This gave the first positive results in strengthening the position of the Russian Orthodox Church among the local population of the Vyatka diocese
Erratum to: Di-boson signatures as standard candles for partial compositeness (Journal of High Energy Physics, (2017), 2017, 1, (94), 10.1007/JHEP01(2017)094)
No full text© 2017, The Author(s). The sign of C t in appendix C, eqs. (C.1), (C.7), (C.8) needs to be reversed
Measurement of the effective B0s→K+K− lifetime
No full textA measurement of the effective lifetime is presented using approximately 37 pb−1 of data collected by LHCb during 2010. This quantity can be used to put constraints on contributions from processes beyond the Standard Model in the meson system and is determined by two complementary approaches as
τKK=1.440±0.096 (stat)±0.008 (syst)±0.003 (model) ps
Towards model-independent approach to the analysis of interference effects in pair production of new heavy quarks
No full textWe propose a model independent approach for the analysis of interference effects in the process of QCD pair production of new heavy quarks of different species that decay into Standard Model particles, including decays via flavour changing neutral currents. By adopting as ansatz a simple analytical formula we show that one can accurately describe the interference between two different such particle pairs leading to the same final state using information about masses, total widths and couplings. A study of the effects on differential distributions is also performed showing that, when interference plays a relevant role, the distributions of the full process can be obtained by a simple rescaling of the distributions of either quark contributing to the interference term. We also present the range of validity of the analytical expression that we have found. © 2014 The Author(s)
H.G. Wells and Early Soviet Science Fiction
No full textOne of the most fascinating aspects of Wells's relationship with Russia is his rather outsized influence on Soviet science fiction. The talk will pay particular attention to the impact the English writer had on Alexander Belyaev, a pioneer of sci fi in the USSR, author of Professor Dowell's Head (1925) and The Amphibian Man (1928). Wells and Belyaev met during Wells's visit to the Soviet Union in 1934.Non UBCUnreviewedFacult
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
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