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Enumerating Abelian Typical Cube-Free Fold Coverings of a Circulant Graph

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Algebra Colloquium 2020年第1期27卷 137-148页

作者： Young Soo Kwon Jaeun Lee Department of Mathematics Yeungnam UniversityKyongsan712-749Korea

Enumerating the isomorphism or equivalence classes of several types of graph coverings is one of the central research topics in enumerative topological graph theory.A covering projection p from a Cayley graph Cay(Г,X)onto another Cayley graph Cay(Q,y)is called typical if the function p:Г→Q on the vertex sets is a group epimorphism.A typical covering is called abelian(or circulant,respectively)if its covering graph is a Cayley graph on an abelism(or a cyclic,respectively)***,the equivalence classes of connected abelian typical prime-fold coverings of a circulant graph are *** a continuation of this work,we enumerate the equivalence classes of connected abelian typical cube-free fold coverings of a circulant graph.

关键词： graph covering enumeration voltage assignment circulant graph

Ice Resistance Assessment for a Large Size Vessel Running in a Narrow Ice Channel Behind an Icebreaker

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Journal of Marine science and Application 2021年第3期20卷 446-455页

作者： Kirill Sazonov Aleksei Dobrodeev Krylov State Research Center Ice Model TankSt.PetersburgRussian Federation State Marine Technical University St.PetersburgRussian Federation

Large size vessels sailing in continuous level ice and broken ice of high concentration are mostly assisted by *** is done in order to provide for fast transportation through the North Sea Route and safe operation in extreme ice ***,new large size gas and oil carriers and container ships are being designed and built with beams much greater than the beams of existing *** the same time,no mathematical description exists for the breaking mechanism of ice channel edges,when such vessels move under icebreaker *** paper suggests a simple method for assessment of the ice resistance in the case of a large ship running in an icebreaker channel;the method is based on modification of well-known semi-empirical methods for calculation of the ice resistance to ships in level and broken *** main feature of the proposed calculation scheme consists in that different methods are applied to estimate the ice resistance in broken ice and due to breaking of level ice *** combination of these methods gives a deliverable ice resistance of a large size vessel moving under icebreaker assistance in a newly made ice *** general,proposed method allows to define the speed of a carrier moving in an ice channel behind a modern linear icebreaker and could be applied at the ship design stage and during development of the marine transportation *** paper also discusses the ways for further refinement of the assessment procedure suggested.

关键词： Ice resistance Icebreaker assistance Large size vessels Narrow ice channel Northern Sea Route Ice model tests

Toward room-temperature nanoscale skyrmions in ultrathin films

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npj Computational Materials 2020年第1期6卷 58-68页

作者： Anastasiia SVarentcova Stephan von Malottki Maria N.Potkina Grzegorz Kwiatkowski Stefan Heinze Pavel F.Bessarab ITMO University St.Petersburg 197101Russia science Institute University of IcelandReykjavík 107Iceland Kavli Institute of Nanoscience Delft University of TechnologyP.O.Box 4056Delft 2600 GAThe Netherlands Institute of Theoretical Physics and Astrophysics University of KielLeibnizstrasse 15Kiel 24098Germany St.Petersburg State University St.Petersburg 198504Russia Peter Grünberg Institute and Institute for Advanced Simulation Forschungszentrum JülichJülich 52425Germany

Breaking the dilemma between small size and room-temperature stability is a necessary prerequisite for skyrmion-based information *** we demonstrate by means of rate theory and an atomistic spin Hamiltonian that the stability of isolated skyrmions in ultrathin ferromagnetic films can be enhanced by the concerted variation of magnetic interactions while keeping the skyrmion size *** predict film systems where the lifetime of sub-10 nm skyrmions can reach years at ambient conditions.

关键词： conditions stability films

Comparative assessment of phenolics,antioxidant and antiproliferative activities between Hippophae rhamnoides *** and *** leaf in Qinghai-Tibet Plateau

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Food Bioscience 2022年第2期46卷 148-157页

作者： Juan Wei Tingting Su Hailan Su Yumei Jiang Jixin Li Yang Bi College of Food science and Engineering Gansu Agricultural UniversityLanzhou730070China

Hippophae rhamnoides ***(Rha)and ***(Tib)are two species of sea buckthorn which distribute in Qinghai-Tibet *** results showed that both sea buckthorn leaf exhibited high total phenolic and flavonoid content,and Rha leaf showed much higher *** addition,66 phenolic compounds were detected,belonging to classes of benzoic acid derivatives,flavonols,flavanols,flavanones,and so *** of benzoic acid derivatives and flavonols were most abundant,among them ellagic acid and rutin were the most and second abundant ***,methyl gallate,2,6-dihydroxybenzoic acid,4-hydroxybenzoic acid,gentisic acid,narcissin,astragalin,nicotiflorin,prunin,procyanidin B3,cyanidin 3-O-rutinoside chloride,delphinidin 3-glucoside,gallocatechin,taxifolin,aromadendrin and trans-3,3′,4′,5,5′,7-Hexahydroxyflavanone were the first time to be identified in SBT ***,significant free radical scavenging effects of ABTS and DPPH,ferric reducing antioxidant ability,cellular antioxidant properties and anti-proliferation activity against HepG2 cells were observed in the aqueous ethanol extracts of sea buckthorn *** Rha showed stronger inhibitory effects,which might due to the higher content of total phenolic and flavonoid *** finding clearly supported that Rha leaf as a wild and non-pollution plant could be a better choice as a healthy food resource.

关键词： Sea buckthorn Phenolic compounds Flavonoids Antioxidant capacity Antiproliferation activity

Detailed characterization of a laboratory magnetized supercritical collisionless shock and of the associated proton energization

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Matter and Radiation at Extremes 2022年第1期7卷 15-28页

作者： W.Yao A.Fazzini S.N.Chen K.Burdonov P.Antici J.B´eard S.Bolaños A.Ciardi R.Diab E.D.Filippov S.Kisyov V.Lelasseux M.Miceli Q.Moreno V.Nastasa S.Orlando S.Pikuz D.C.Popescu G.Revet X.Ribeyre E.d’Humi`eres J.Fuchs LULI–CNRS CEAUPMC Univ Paris 06:Sorbonne Universit´eEcole PolytechniqueInstitut Polytechnique de ParisF-91128 Palaiseau CedexFrance Sorbonne Universit´e Observatoire de ParisUniversit´e PSLCNRSLERMAF-75005 ParisFrance ELI-NP “Horia Hulubei”National Institute for Physics and Nuclear Engineering30 Reactorului StreetRO-077125 Bucharest-MagureleRomania IAP Russian Academy of Sciences603155 Nizhny NovgorodRussia INRS-EMT 1650 Blvd.Lionel-BouletVarennesQuebec J3X 1S2Canada LNCMI UPR 3228CNRS-UGA-UPS-INSAF-31400 ToulouseFrance JIHT Russian Academy of Sciences125412 MoscowRussia Universit`a degli Studi di Palermo Dipartimento di Fisica e Chimica E.Segr`ePiazza del Parlamento 190134 PalermoItaly INAF–Osservatorio Astronomico di Palermo PalermoItaly University of Bordeaux Centre Lasers Intenses et ApplicationsCNRSCEAUMR 5107F-33405 TalenceFrance ELI-Beamlines Institute of PhysicsCzech Academy of Sciences5 Kvetna 83525241 Dolni BrezanyCzech Republic NRNU MEPhI 115409 MoscowRussia

Collisionless shocks are ubiquitous in the Universe and are held responsible for the production of nonthermal particles and high-energy *** the absence of particle collisions in the system,theory shows that the interaction of an expanding plasma with a pre-existing electromagnetic structure(as in our case)is able to induce energy dissipation and allow shock *** formation can alternatively take place when two plasmas interact,through microscopic instabilities inducing electromagnetic fields that are able in turn to mediate energy dissipation and shock *** our platform in which we couple a rapidly expanding plasma induced by high-power lasers(JLF/Titan at LLNL and LULI2000)with high-strength magnetic fields,we have investigated the generation of a magnetized collisionless shock and the associated particle *** have characterized the shock as being collisionless and *** report here on measurements of the plasma density and temperature,the electromagnetic field structures,and the particle energization in the experiments,under various conditions of ambient plasma and magnetic *** have also modeled the formation of the shocks using macroscopic hydrodynamic simulations and the associated particle acceleration using kinetic particle-in-cell *** a companion paper to Yao et al.[***.17,1177–1182(2021)],here we show additional results of the experiments and simulations,providing more information to allow their reproduction and to demonstrate the robustness of our interpretation of the proton energization mechanism as being shock surfing acceleration.

关键词： field collision shock

Dielectric properties of bismuth-containing pyrochlores:A comparative analysis

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Journal of Advanced Dielectrics 2022年第2期12卷 29-35页

作者： M.V.Talanov E.V.Glazunova V.I.Kozlov S.P.Kubrin A.A.Bush V.M.Talanov K.E.Kamentsev Research Institute of Physics Southern Federal University av.Stachki 193 Rostov-on-Don344090Russia Research Institute of Solid State Electronics Materials MIREA-russian Technological University(RTU MIREA)5th Street of Sokolinaya Gora 22 Moscow 119454Russia Technological Department Platov South-russian State Polytechnic University(NPI)Prosvescheniya Str.132 Novocherkassk 346428Russia

The comparative analysis of the dielectric properties of bismuth-containing pyrochlores with different manifestation of atomic order/disorder was carried *** examined the dielectric properties(including behavior in electric fields)of two pyrochlore compounds:BZN(presumably a composition close to Bi_(1.5)Zn_(0.5)Nb_(1.5)O_(6.5))ceramics with chemical disorder in both A and B cation sublattices and Bi_(2)Ti_(2)O_(7)single crystal with fully chemical ordered *** fundamental differences between the dielectric properties of the BZN ceramics and Bi_(2)Ti_(2)O_(7)single crystal were *** particular,in the dielectric relaxation behavior(which cannot be described via Arrhenius law in the Bi_(2)Ti_(2)O_(7))or in the influence of the electric fields on the dielectric permittivity(split-ting of the field-cooled and zero-field-cooled behaviors was observed for Bi_(2)Ti_(2)O_(7)below estimated freezing temperature).The results of this study highlights the special role of Bi_(2)Ti_(2)O_(7)as a candidate material for studying aspects of geometric frustration related with pyrochlore structure in non-magnetic medium and specifies the future directions of research.

关键词： Pyrochlores relaxor behavior bismuth titanate dielectric permittivity geometric frustration

Characterization and performance of the Apollon short-focal-area facility following its commissioning at 1 PW level

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Matter and Radiation at Extremes 2021年第6期6卷 12-25页

作者： K.Burdonov A.Fazzini V.Lelasseux J.Albrecht P.Antici Y.Ayoul A.Beluze D.Cavanna T.Ceccotti M.Chabanis A.Chaleil S.N.Chen Z.Chen F.Consoli M.Cuciuc X.Davoine J.P.Delaneau E.d’Humieres J.-L.Dubois C.Evrard E.Filippov A.Freneaux P.Forestier-Colleoni L.Gremillet V.Horny L.Lancia L.Lecherbourg N.Lebas A.Leblanc W.Ma L.Martin F.Negoita J.-L.Paillard D.Papadopoulos F.Perez S.Pikuz G.Qi F.Quere L.Ranc P.-A.Soderstrom M.Sciscio S.Sun S.Vallieres P.Wang W.Yao F.Mathieu P.Audebert J.Fuchs LULI–CNRS CEASorbonne UniversiteEcole PolytechniqueInstitut Polytechnique de ParisF-91128 Palaiseau CedexFrance Sorbonne Universite Observatoire de ParisUniversite PSLCNRSLERMAF-75005 ParisFrance IAP Russian Academy of Sciences603155 Nizhny NovgorodRussia INRS-EMT 1650Boulevard Lionel-BouletVarennesQuebec J3X 1S2Canada Universite Paris-Saclay CEACNRSLIDYL91191Gif-sur-YvetteFrance Universite Paris-Saclay CEALMCE91680 Bruy`eres-le-ChˆatelFrance “Horia Hulubei”National Institute for Physics and Nuclear Engineering 30 Reactorului StreetRO-077125 Bucharest-MagureleRomania ENEA Fusion and Technologies for Nuclear Safety DepartmentC.R.FrascatiVia E.Fermi 4500044 FrascatiItaly University of Bordeaux Centre Lasers Intenses et ApplicationsCNRSCEAUMR 5107F-33405 TalenceFrance Joint Institute for High Temperatures RAS125412 MoscowRussia Laboratoire d’Optique Appliquee Ecole Polytechnique–ENSTA–CNRS–Institut Polytechnique de ParisPalaiseauFrance State Key Laboratory of Nuclear Physics and Technology School of PhysicsCAPTPeking UniversityBeijing 100871China Laboratoire Charles Fabry Institut d’Optique Graduate SchoolCNRSUniversite Paris-Saclay91127 Palaiseau CedexFrance

We present the results of the first commissioning phase of the short-focal-length area of the Apollon laser facility(located in Saclay,France),which was performed with the first available laser beam(F2),scaled to a nominal power of 1 *** the conditions that were tested,this beam delivered on-target pulses of 10 J average energy and 24 fs *** diagnostics were fielded to assess the performance of the *** on-target focal spot and its spatial stability,the temporal intensity profile prior to the main pulse,and the resulting density gradient formed at the irradiated side of solid targets have been thoroughly characterized,with the goal of helping users design future *** of energetic electrons,ions,and electromagnetic radiation were recorded,showing good laser-to-target coupling efficiency and an overall performance comparable to that of similar international *** will be followed in 2022 by a further commissioning stage at the multipetawatt level.

关键词： performance beam nominal