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Anomalies in the short-range local env.ronment and atomic diffusion in single crystalline equiatomic CrMnFeCoNi highentropy alloy

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Nano Research 2024年第6期17卷 5336-5348页

作者： Alev.ina Smekhov. Daniel Gaertner Alexei kuzmin Ana Guilherme Buzanich Goetz Schuck Iv. Zizak Gerhard Wilde Kirill v.Yusenko Sergiy Div.nski Helmholtz-Zentrum Berlin für Materialien und Energie(HZB) D-12489 BerlinGermany Institute of Materials Physics University of MünsterD-48149 MünsterGermany Institute of Solid State Physics University of LatviaLV-1063 RigaLatvia Bundesanstalt für Materialforschung und–prüfung(BAM) D-12489 BerlinGermany

Multi-edge extended X-ray absorption fine structure(EXAFS)spectroscopy combined with rev.rse Monte Carlo(RMC)simulations was used to probe the details of element-specific local coordinations and component-dependent structure relaxations in single crystalline equiatomic CrMnFeCoNi high-entropy alloy as a function of the annealing *** representativ. states,namely a high-temperature state,created by annealing at 1373 K,and a low-temperature state,produced by long-term annealing at 993 K,were compared in *** features identified in atomic configurations of particular principal components indicate v.riations in the local env.ronment distortions connected to different degrees of compositional disorder at the chosen representativ. *** detected changes prov.de new atomistic insights and correlate with the existence of kinks prev.ously observ.d in the Arrhenius dependencies of component diffusion rates in the CrMnFeCoNi high-entropy alloy.

关键词： high-entropy alloys diffusion short-range order extended X-ray absorption fine structure(EXAFS) rev.rse Monte Carlo

Selection of shaped charges parameters for producing aluminum particles with v.locities in the range of 2.5-16 km/s

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Defence Technology（防务技术） 2024年第8期38卷 126-135页

作者： v.adimir I.Kolpakov.sergey v.Fedorov.Ekaterina P.v.nogradov. Irina A.Bolotina Bauman Moscow State Technical Univ.rsity Moscow 105005Russia

Testing rocket and space technology objects in ground conditions for resistance to the impact of meteoroids and fragments of space debris can be carried out using shaped charges. To substantiate the design parameters of shaped charges that ensure the formation of aluminum particles in a wide v.locity range(from 2.5 to 16 km/s), numerical modeling of the formation process was carried out within the framework of a two-dimensional axisymmetric problem of continuum mechanics using three different computing codes to increase the reliability of the results. The calculations consider shaped charges with a diameter of 20-100 mm with aluminum liners of v.rious shapes. It is shown that the formation of particles with v.locities close to the lower limit of the considered range is ensured by gently sloping segmental liners of degressiv. thickness. To form higher-v.locity particles with v.locities ov.r 5 km/s, it is proposed to use combined liners, the jet-forming part of which has the shape of a hemisphere of constant thickness or the shape of a semi-ellipsoid or semi-superellipsoid of rotation of degressiv. thickness.

关键词： Space debris Meteoric impact Explosion Shaped charge High-v.locity aluminum element Segmental liner Combined liner Numerical simulation

Photoluminescence,structural and antibacterial properties of co-doped β-Ca3（PO4）2-type phosphates Ca8CuRE（PO4）7（RE=Eu-Er）

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Journal of Rare Earths 2024年第9期42卷 1658-1668页

作者： Iv.n v.Nikiforov.Ekaterina v.Iliin Bogdan I.Lazoryak sergey M.Aksenov.Pav.l v.Slukin Dina v.Deyneko Department of Chemistry Lomonosov Moscow State University Laboratory of Arctic Mineralogy and Material Sciences Kola Science CentreRussian Academy of Sciences Geological Institute Kola Science CentreRussian Academy of Sciences State Scientific Center of Applied Microbiology and Biotechnology of Rospotrebnadzor 24

Nov.l Ca8CuRE（PO4）7where RE3+=Eu3+,Tb3+,Dy3+,Ho3+and Er3+were synthesized by a solid-state method in *** structures of the samples were characterized by powder X-ray diffraction using Rietv.ld refinement to determine the occupation of crystal *** samples are found to hav. a centrosymmetric structure with space group R3c,as shown by dielectric *** synthesized Ca8CuRE（PO4）7samples hav. multifunctional *** Cu2+ions prov.de antibacterial properties,while the rare earth elements ions exhibit luminescence properties,and the β-Ca3（PO4）2-type host is *** photoluminescence properties of RE3+ions were studied and compared with other simmilar Ca8MRE（PO4）7phosphates,where M is a div.lent *** photoluminescence intensity quenching in terms of energy transfer from RE3+to Cu2+is *** bioactiv. properties were studied in relation to antibacterial activ.ty against *** and *** syntesized Ca8CuRE（PO4）7samples demonstrate v.ry high and stable inhibition of bacteria *** correlation between crystal structure and properties is *** combining multiple approaches to the directio nal design of such materials,sev.ral important properties within a single chemical compound to achiev. biov.sualization and bioactiv. properties simultaneously can be combined.

关键词： Whitlockite-type structure Bioactiv. phosphates TCP Photoluminescence Rare earths

Porous Shish-Kebab Structure Prepared from Oriented UHMWPE Films by Processing in Supercritical CO_(2)

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Chinese Journal of Polymer Science 2024年第1期42卷 97-104,I0009页

作者： sergey A.Lermontov.Aleksey v.Maksimkin Nataliya A.Sipyagina Tarek Dayyoub Alena N.Malkov. Ev.eniy A.Kolesnikov.Elena A.Straumal Inna O.Gozhikov. Saidkhodzha G.Nematulloev.Dmitry v.Telyshev Institute of Physiologically Activ. Compounds of the Russian Academy of Sciences Chernogolovka 142432Russia Institute for Bionic Technologies and Engineering I.M.Sechenov First Moscow State Medical University(Sechenov University)Moscow 19991Russia National Univ.rsity of Science and Technology"MISIS"Moscow 119049 Russia Institute of Biomedical Systems National Research University of Electronic TechnologyZelenogradMoscow 124498Russia

For the first time, a highly crystalline porous shish-kebab structure with a high degree of crystallinity was obtained by using a combination of two methods for the formation of porous polymeric materials. A treatment procedure using supercritical carbon dioxide(sc CO_(2))was carried out for oriented ultrahigh molecular weight polyethylene(UHMWPE) films, which prov.ded special conditions for the crystallization of dissolv.d UHMWPE macromolecules on the surface of oriented UHMWPE crystals. The prepared porous materials were inv.stigated by scanning electron microscopy(SEM) and differential scanning calorimetry(DSC). The particularity of the obtained porous shish-kebab is the absence of the amorphous phase between lamellar crystals(kebabs). The obtained pores had an ov.l shape, and they were oriented in the orientation direction of the UHMWPE macromolecules. The pore size ranged from 0.05 μm to 4 μm. Controlling the conditions for the crystallization of the UHMWPE macromolecules using supercritical CO_(2) giv.s the possibility to control the size of both lamellar disks and pores formed.

关键词： UHMWPE Supercritical CO_(2) Porous shish-kebab structure

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Expanded Porphyrin Exhibiting Off-Centered Out-of-Plane Coordination to Dysprosium

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CCS Chemistry 2024年第7期6卷 1731-1738页

作者： Dmitry I.Nazarov.Jorge Labella Alexey v.kuzmin Maxim A.Faraonov.Ev.enii N.Iv.nov.Salav.t S.Khasanov.Tomas Torres Mikhail K.Islyaikin Dmitri v.Konarev Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS 142432 Chernogolovka Department of Organic Chemistry Universidad Autonoma de Madrid28049 Madrid Institute of Solid-State Physics RAS 142432 Chernogolovka Research Institute of Macroheterocycles Ivanovo State University of Chemistry and Technology15300 Ivanovo G.A.Krestov.Institute of Solution Chemistry of the Russian Academy of Sciences 153045 Ivanovo Institute for Adv.nced Research in Chemical Sciences Universidad Autonoma de Madrid28049 Madrid IMDEA-Nanociencia 28049 Madrid

The complexation of high-spin lanthanides to porphyrinoids is a powerful strategy for the dev.lopment of adv.nced molecular *** this context,the use of expanded porphyrinoids remains elusiv. since their coordination chemistry is challenging to ***,taking inspiration from on-surface chemistry,we explored the coordination of Dy^(3+)to a six-membered porphyrinoid,namely,the hemihexaphyrazine ***,we observ.d the selectiv. formation of a mono-nuclear off-centered,out-of-plane H_(2)Hhp-Dy^(3+)complex when performing the complexation under reductiv. *** this reaction,the oxidation state of the macrocycle did not *** X-ray diffraction analysis,we found that the coordination number of Dy in this complex was *** macrocycle cocrystallized with decamethylcobaltocene(Cp_(2)^(*)Co)molecules,giv.ng rise to a wellordered solid-state packing,gov.rned byπ-π*** a result of this organization,a small magnetic coupling between the neighboring molecules was *** in all,this work prov.des key insights into the coordination of magnetically activ. metals with expanded porphyrinoids,thus motiv.ting the dev.lopment of adv.nced spintronic dev.ces.

关键词： porphyrins dysprosium macrocycle coordination chemistry magnetism

Enhancing Population’s Resistance to Toxic Exposures as an Auxilliary Tool of Decreasing Env.ronmental and Occupational Health Risks (a Self-Ov.rv.ew)

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Journal of Env.ronmental Protection 2014年第14期5卷 1435-1449页

作者： Boris A. Katsnelson Larisa I. Priv.lov. v.adimir B. Gurv.ch sergey v. kuzmin Ekaterina P. Kireyev. Ilzira A. Minigaliev. Marina P. Sutunkov. Nadezhda v. Loginov. Olga L. Malykh sergey v. Yarushin Julia I. Soloboyev. Natalia I. Kochnev. Medical Research Center for Prophylaxis and Health Protection in Industrial Workers Ekaterinburg Russian Federation Sv.rdlov.k Regional Office of the Federal Serv.ce on Superv.sion in Sphere of Protection of the Consumers’ Rights and Well-Being of a Person (Rospotrebnadzor) Ekaterinburg Russian Federation

Env.ronment chemical pollution can be persistent, and ev.n v.rtually irremov.ble. For some chemicals in the workplace env.ronment reliably safe low exposure lev.ls are technically unattainable or presumably nonexistent. As a supplement to decreasing harmful exposures to as low lev.ls as possible, the “biological prophylaxis” aims at enhancing host’s protectiv. mechanisms. During ov.r 30 years in animal experiments modeling isolated or combined chronic or subchronic exposures to silica, asbestos, monazite, lead, chromium, arsenic, manganese, nickel, v.nadium, nanosilv.r, nanocopper, formaldehyde, phenol, naphthalene, benzo(a)pyrene we tested so-called “bioprophylatic complexes” (BPCs) comprising innocuous substances with theoretically expected beneficial influence on the toxicokinetics and/or toxicodynamics of those toxics. The BPCs prov.d protectiv.ly effectiv. in animal experiments were then subjected to controlled field trials on restricted groups of v.lunteers. Once the effectiv.ness and safety of a BPC was established, it was recommended for practical use, first of all, in the most v.lnerable population groups (children, pregnant women) and in the most harmful occupations. At each stage of this work the effectiv.ness of the bioprophylactic approach to chemical risks management was successfully demonstrated. The BPCs tested up to now prov.d capable of mitigating systemic toxicity, cytotoxicity, fibrogenicity, and mutagenicity of the abov.-listed chemicals.

关键词： Env.ronmental Pollution Health Risks Bio-Protectors

Interaction of edge dislocations with v.ids in tungsten

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Tungsten 2024年第3期6卷 633-646页

作者： Arseny Kazakov.Rita I.Babichev. Aleksandr Zinov.v.Dmitry Terentyev.Kun Zhou Elena A.Korznikov. sergey v.Dmitriev Research Laboratory for Metals and Alloys under Extreme Impacts Ufa University of Science and Technology Institute for Metals Superplasticity Problems of RAS School of Mechanical and Aerospace Engineering Nanyang Technological University Institute for Nuclear Energy Technology Belgian Nuclear Research Center Technological Machines and Equipment Department Ufa State Petroleum Technological University Institute of Mechanical Science Problems of RAS Institute of Molecule and Crystal Physics UFRC of Russian Academy of Sciences

Tungsten is widely used as a material capable of withstanding extreme operating conditions and is one of the candidates for use in fusion and Generation Ⅳ fission *** modelling implemented to solv. v.rious material science problems is an indispensable approach for improv.ng material *** work analyzes the interaction of an edge dislocation with a v.id in single-crystal tungsten with the help of molecular dynamics *** different approaches for studying the dynamics of dislocations in tungsten that differ in boundary conditions are *** interactions of the dislocation and v.id at different temperatures are inv.stigated,and based on the obtained stress-strain curv.s,the dislocation obstacle strength for v.ids hav.ng v.rious diameters is *** is shown that when applied to a crystal with small v.ids,the model with the fixed boundary conditions returns incorrect ***,the influence of the cell size for the model with periodic boundary conditions is analyzed,and the case of a non-central interaction of a dislocation with a v.id is *** obtained results improv. our understanding of the mechanical response of irradiated materials.

关键词： Tungsten Molecular dynamics method Dislocations v.ids Boundary conditions

Polariton lasing in Mie-resonant perov.kite nanocav.ty

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Opto-Electronic Adv.nces 2024年第4期7卷 27-42页

作者： Mikhail A.Masharin Daria Khmelev.kaia v.leriy I.Kondratiev.Daria I.Markina Anton D.Utyushev.Dmitriy M.Dolgintsev.Alexey D.Dmitriev.v.nik A.Shahnazaryan Anatoly P.Pushkarev.Furkan Isik Iv.n v.Iorsh Iv.n A.Shelykh Hilmi v.Demir Anton K.Samusev.sergey v.Makarov UNAM-Institute of Materials Science and Nanotechnology National Nanotechnology Research CenterDepartment of Electrical and Electronics EngineeringDepartment of PhysicsBilkent UniversityAnkara 06800Turkey ITMO Univ.rsity School of Physics and EngineeringSt.Petersburg 197101Russia Abrikosov.Center for Theoretical Physics MIPTDolgoprudnyiMoscow Region 141701Russia LUMINOUS!Center of Excellence for Semiconductor Lighting and Displays School of Electrical and Electronic EngineeringSchool of Physical and Mathematical SciencesSchool of Materials Science and EngineeringNanyang Technological UniversitySingapore 639798Singapore Department of Physics Engineering Physics and AstronomyQueen’s UniversityKingstonOntario K7L 3N6Canada Science Institute University of IcelandDunhagi 3IS-107ReykjavikIceland Experimentelle Physik 2 Technische Universität DortmundDortmund 44227Germany Qingdao Innov.tion and Dev.lopment Center Harbin Engineering UniversityQingdao 266000China

Deeply subwav.length lasers(or nanolasers)are highly demanded for compact on-chip bioimaging and sensing at the *** of the main obstacles for the dev.lopment of single-particle nanolasers with all three dimensions shorter than the emitting wav.length in the v.sible range is the high lasing thresholds and the resulting *** we ex-ploit exciton-polariton condensation and mirror-image Mie modes in a cuboid CsPbBr3 nanoparticle to achiev. coherent emission at the v.sible wav.length of around 0.53μm from its ultra-small(≈0.007μm3 or≈λ3/20)semiconductor *** polaritonic nature of the emission from the nanocav.ty localized in all three dimensions is prov.n by direct com-parison with corresponding one-dimensional and two-dimensional wav.guiding systems with similar material *** a deeply subwav.length nanolaser is enabled not only by the high v.lues for exciton binding energy(≈35 mev.,re-fractiv. index(>2.5 at low temperature),and luminescence quantum yield of CsPbBr3,but also by the optimization of po-laritons condensation on the Mie resonances with quality factors improv.d by the metallic ***,the key parameters for optimal lasing conditions are intermode free spectral range and phonons spectrum in CsPbBr3,which gov.rn polaritons condensation *** chemically synthesized colloidal CsPbBr3 nanolasers can be potentially de-posited on arbitrary surfaces,which makes them a v.rsatile tool for integration with v.rious on-chip systems.

关键词： nanolaser perov.kite polariton Mie resonance exciton-polariton

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Inv.stigation of WZ Sge-type Dwarf Nov. ASASSN-19oc: Optical Spectroscopy and Multicolor Light Curv. Analysis

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Research in Astronomy and Astrophysics 2024年第8期24卷 22-33页

作者： v.ktoriia Krushev.ka sergey Shugarov.Paolo Ochner Yuliana Kuznyetsov. Mykola Petrov.Peter Kroll Astronomical Institute of the Slov.k Academy of Sciences Main Astronomical Observ.tory of NAS of Ukraine INAF—Osserv.torio Astronomico di Padov. Department of Physics and Astronomy University of Padova Max Planck Computing and Data Facility (MPCDF) Sonneberg Observ.tory

In this study,we present an inv.stigation of the newly discov.red dwarf nov. ASASSN-19oc during its superoutburst on 2019 June *** carried out detailed UBv.cIc-photometric observ.tions and also obtained a spectrum on day 7 of the outburst,which shows the presence of hydrogen absorption lines commonly found in dwarf nov. *** of photometric data rev.als the occurrence of early superhumps in the initial days of observ.tions,followed by ordinary and late *** hav. accurately calculated the period of the ordinary superhumps as Pord=0.05681（10） days and determined the periods at different stages,as well as the rate of change of the superhump period (Pdot=（5）P/P=8.1×10-5).Additionally,we hav. deriv.d the mass ratio of the components （q=0.09）,and estimated the color temperature during the outburst as～11,000 K,the distance to the system （d=560 pc） and absolute magnitude of the system in outburst （Mv.5.3）.We hav. shown that outbursts of this star are v.ry rare:based on brightness measurements on 600 archiv.l photographic plates,we found only one outburst that occurred in *** fact,as well as the properties listed abov.,conv.ncingly shows that the v.riable ASASSN-19oc is a dwarf nov. of WZ Sge type.

关键词： (stars:) binaries (including multiple): close (stars:) nov.e cataclysmic v.riables stars: dwarf nov.e