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Energy of a solid sphere under nonstationary oscillations

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Science China(Physics,Mechanics & Astronomy) 2014年第3期57卷 469-476页

作者： PETROv Yu. smirnov v. UTKIN A. BRATOv v. St.-Petersburg State University Institute of Problems of Mechanical Engineering Russian Academy of Sciences St.-Petersburg State Transport University

Analytical solution for spherically symmetric nonstationary oscillations of acoustic and elastic solid sphere is *** dependence of potential,kinetic and internal energy of a solid sphere is *** received results are of practical importance for a wide range of problems connected to testing of material dynamic strength parameters and to the problems of optimizing(minimizing)energy needed for fracture of solids.

关键词： nonstationary oscillations analytical solution material dynamics dynamic elastisity kinetic energy potential energy internal energy energy exchange

Potential of octant degeneracy resolution in JUNO

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Chinese Physics C 2019年第3期43卷 17-21页

作者： M.v.smirnov Zhoujun Hu Shuaijie Li Jiajie Ling Department of physics Sun Yat-Sen UniversityGuangzhou 510275China

This work extends the idea of using a cyclotron-based antineutrino source for purposes of neutrino *** baseline experiments suffer from degeneracies and correlations between Θ_(23), δ_(CP) and the mass ***, the combination of a superconducting cyclotron and a big liquid scintillator detector like JUNO in a medium baseline experiment, which does not depend on the mass hierarchy, may allow to determine whether the position of the mixing angle Θ_(23) is in the lower octant or the upper octant. Such an experiment would improve the precision of the Θ_(23) measurement to a degree which depends on the CP-phase.

关键词： neutrino oscillations octant mixing angle JUNO

variability in distribution of major and trace elements in Lower Eocene siliceous sections of the Transuralian Region, Russia

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Acta Geochimica 2019年第2期38卷 262-276页

作者： P.v.smirnov A.O.Konstantinov G.A.Batalin B.I.Gareev Tyumen Industrial University Technische Universit?t Clausthal Kazan Federal University

This paper presents lithologic and geochemical data from the sequence of the Eocene Irbit formation siliceous rocks(Transuralian Region) outcropping in a quarry in the Irbit deposit(thickness of 15 m) and in a large natural outcrop, Belaya Gorka(thickness of 13 m). The data show that both outcrops are composed of diatomites and clayey diatomites, both characterized by a certain degree of lithologic heterogeneity around their chemical,granulometric, and mineralogical compositions;microstructural features; and degree of diatom preservation. The values of indices important for the classification of siliceous rocks and determination of prospects for their industrial application—SiO_2, Al_2O_3, Fe_2O_3, and clay fraction content—ranged from 66% to 77%, 7% to 14%,3.00% to 5.60%, and 23% to 50%, respectively. In all studied lithologic varieties, element abundances of v, Cr,Mn, Co, Ni, Cu, Zn, Ga, Ge, and Sb were two to three times higher than their respective abundances in the Earth's crust. This is probably related to these elements' involvement in the biological cycle and favorable conditions for transport. Rb, Cs, Ba, and Sr, as well as rare earth elements,are considered the most reliable indicators of lithologic and geochemical subdivision of a sequence of siliceous rocks,as they are associated mainly with clayey minerals. variations in these indicators have recorded, with great probability, even short-term cycles and semi-cycles of silicasedimentation in the Transuralian Region, as well as tectonic regime and involvement of terrigenous influx.

关键词： Diatomite Clayey diatomite Irbit formation Eocene Geochemical variability

ESTIMATION OF DENSITY AND DETONATION vELOCITY OF TETRAZOLE Co（Ⅲ）COMPLEXES

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含能材料 1994年第1期 16-20页

作者： IIushin M A smirnov A v Kotomin A A TselynskyI v (Institute of Technology, Russia)

ＥＳＴＩＭＡＴＩＯＮＯＦＤＥＮＳＩＴＹＡＮＤＤＥＴＯＮＡＴＩＯＮＶＥＬＯＣＩＴＹＯＦＴＥＴＲＡＺＯＬＥＣｏ（Ⅲ）ＣＯＭＰＬＥＸＥＳＩＩｕｓｈｉｎＭＡＳｍｉｒｎｏｖＡＶＫｏｔｏｍｉｎＡＡＴｓｅｌｙｎｓｋｙＩＶ（Ｉｎｓｔ... 详细信息

ＥＳＴＩＭＡＴＩＯＮＯＦＤＥＮＳＩＴＹＡＮＤＤＥＴＯＮＡＴＩＯＮＶＥＬＯＣＩＴＹＯＦＴＥＴＲＡＺＯＬＥＣｏ（Ⅲ）ＣＯＭＰＬＥＸＥＳＩＩｕｓｈｉｎＭＡＳｍｉｒｎｏｖＡＶＫｏｔｏｍｉｎＡＡＴｓｅｌｙｎｓｋｙＩＶ（ＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｌｏｇｙ...

关键词： tertrazole Co(Ⅲ)coordination complex density detonation veloci-ty calculation method.

Dynamic failure of dry and fully saturated limestone samples based on incubation time concept

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第1期9卷 125-134页

作者： Yuri v. Petrov Ivan v. smirnov Grigory A. volkov Andrei K. Abramian Anatoliy M. Bragov Stanislav N. verichev Saint Petersburg University Universitetskaya nab. 7-9 Saint Petersburg 199034 Russia Institute of Problems of Mechanical Engineering Russian Academy of Sciences Bolshoj pr. 61 V.O. Saint Petersburg 199178 Russia Lobachevsky State University of Nizhni Novgorod Prospekt Gagarina 23 Nizhny Novgorod 603950 Russia Allseas Engineering B.v. Poortweg 12 Delft 2612 PA The Netherlands

This paper outlines the results of experimental study of the dynamic rock failure based on the comparison of dry and saturated limestone samples obtained during the dynamic compression and split tests. The tests were performed using the Kolsky method and its modifications for dynamic splitting. The mechanical data(e.g. strength, time and energy characteristics) of this material at high strain rates are obtained. It is shown that these characteristics are sensitive to the strain rate. A unified interpretation of these rate effects, based on the structuraletemporal approach, is hereby presented. It is demonstrated that the temporal dependence of the dynamic compressive and split tensile strengths of dry and saturated limestone samples can be predicted by the incubation time criterion. Previously discovered possibilities to optimize(minimize) the energy input for the failure process is discussed in connection with industrial rock failure processes. It is shown that the optimal energy input value associated with critical load, which is required to initialize failure in the rock media, strongly depends on the incubation time and the impact duration. The optimal load shapes, which minimize the momentum for a single failure impact, are demonstrated. Through this investigation, a possible approach to reduce the specific energy required for rock cutting by means of high-frequency vibrations is also discussed.

关键词： Dynamic strength Incubation time criterion Split Hopkinson pressure bar(SHPB) test Tensile strength Compressive strength Water-saturated limestone vibration-assisted rock cutting

Detonation Propagation in 180° Ribs of an Insensitive High Energy Explosive

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含能材料 2004年第A02期12卷 345-347页

作者： S.N.Lubyatinsky A.Yu.Garmashev v.G.Israelyan O.v.Kostitsin B.G.Loboiko v.A.Pashentsev v.A.Sibilev E.B.smirnov v.P.Filin RFNC-vNIITF SnezhinskChelyabinskregion456770RUSSIA

Steady detonation regimes, such as the detonation of explosive rate sticks, are of particular interest in studies of explosive reaction kinetics. If this is the case the detonation front shape as well as the fields of particle velocity, pressure etc. are steady in the system of coordinates linked to the detonation front. This facilitates the analysis of the experimental data obtained to verify or calibrate various detonation models.

关键词：高能炸药爆炸传播动力学粒子速率

Design of high-strength refractory complex solid-solution alloys

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npj Computational Materials 2018年第1期4卷 519-526页

作者： Prashant Singh Aayush Sharma A.v.smirnov Mouhamad S.Diallo Pratik K.Ray Ganesh Balasubramanian Duane D.Johnson Ames Laboratory U.S.Department of EnergyIowa State UniversityAmesIA 50011USA Mechanical Engineering Iowa State UniversityAmesIA 50011USA Materials Science&Engineering Iowa State UniversityAmesIA 50011USA Mechanical Engineering&Mechanics Lehigh UniversityBethlehemPA 18015USA

Nickel-based superalloys and near-equiatomic high-entropy alloys containing molybdenum are known for higher temperature strength and corrosion ***,complex solid-solution alloys offer a huge design space to tune for optimal properties at slightly reduced *** refractory Mo-W-Ta-Ti-Zr,we showcase KKR electronic structure methods via the coherent-potential approximation to identify alloys over five-dimensional design space with improved mechanical properties and necessary global(formation enthalpy)and local(short-range order)*** is modeled with classical molecular dynamic simulations,validated from our first-principle *** predict complex solid-solution alloys of improved stability with greatly enhanced modulus of elasticity(3×at 300 K)over near-equiatomic cases,as validated experimentally,and with higher moduli above 500 K over commercial alloys(2.3×at 2000 K).We also show that optimal complex solid-solution alloys are not described well by classical potentials due to critical electronic effects.

关键词： alloys strength corrosion

Structural modification of titanium surface by octacalcium phosphate via Pulsed Laser Deposition and chemical treatment

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Bioactive Materials 2017年第2期2卷 101-107页

作者： I.v.smirnov J.v.Rau M.Fosca A.De Bonis A.Latini R.Teghil v.I.Kalita A.Yu.Fedotov S.v.Gudkov A.E.Baranchikov v.S.Komlev A.Abaikov institute of metallurgy and materials science russian academy of sciencesleninsky prospect 49119334 moscowrussia istituto di struttura della materia consiglio nazionale delle ricerchevia del fosso del cavaliere 10000133 romeitaly dipartimento di scienze universita della basilicataviale dell'ateneo lucano1085100 potenzaitaly universita di roma“la sapienza” dipartimento di chimicapiazzale aldo moro500185 romeitaly lobachevsky state university gagarin av5.23603950 nizhny novgorodrussia prokhorov institute of general physics russian academy of sciencesvavilova street38119991 moscowrussia institute of theoretical and experimental biophysics russian academy of sciencesinstitutskaya street3pushchino142290 moscow regionrussia kurnakov institute of general and inorganic chemistry of the russian academy of sciences leninsky prospect 31119991 moscowrussia

In the present study, the Pulsed Laser Deposition (PLD) technique was applied to coat titanium for orthopaedicand dental implant applications. Calcium carbonate (CC) was used as starting coating *** deposited CC films were transformed into octacalcium phosphate (OCP) by chemical treatments. Theresults of X-ray diffraction (XRD), Raman, Fourier Transform Infrared Spectroscopy (FTIR) and scanningelectron microscopy (SEM) studies revealed that the final OCP thin films are formed on the titaniumsurface. Human myofibroblasts from peripheral vessels and the primary bone marrow mesenchymalstromal cells (BMMSs) were cultured on the investigated materials. It was shown that all the investigatedsamples had no short-term toxic effects on cells. The rate of division of myofibroblast cells growing onthe surface and saturated BMMSs concentration for the OCP coating were about two times faster than ofcells growing on the CC films.

关键词： Titanium implants Coating Pulsed Laser Deposition Calcium carbonate Octacalcium phosphate

EARLY PTOLEMAIC COINS FROM THE COLLECTION OF THE STATE HISTORICAL MUSEUM (MOSCOW)

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Journal of Ancient Civilizations 2023年第2期38卷 191-235,250页

作者： Svyatoslav v.smirnov Eugenii v.Zakharov Institute of World History Russian Academy of SciencesMoscowRussia The State Historical Museum MoscowRussia

In 2018,the work of one of the leading experts in numismatics of Hellenistic Egypt Catharine ***’s Coins of the Ptolemaic Empire was out of *** work significantly complements and,in some ways,revises the fundamental ... 详细信息

关键词： details Egypt some