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Measurement of yields and angular distrib.tions ofγ-quanta from the interaction of 14.1 Mev.neutrons with oxygen,phosphorus,and sulfur

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Chinese Physics C 2024年第3期48卷 79-92页

作者： D.N.Grozdanov.N.A.fedorov.S.b.Dab.lov. Yu.N.Kopatch I.N.Ruskov.v.R.Skoy T.Yu.Tretyakov. C.Hramco P.I.Kharlamov.G.v.Pampushik P.G.Filonchik A.v.Andreev Joint Institute for Nuclear Research(JINR) DubnaRussia Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of SciencesSofiaBulgaria Faculty of Physics Lomonosov Moscow State UniversityMoscowRussia L.N.Gumilyov.Eurasian National Univ.rsity AstanaKazakhstan Skob.ltsyn Institute of Nuclear Physics Moscow State UniversityMoscowRussia Institute of Chemistry of Moldov. ChisinauRepublic of Moldova Moscow Institute of Physics and Technology MoscowRussia

A study of the inelastic scattering of neutrons with an energy of 14.1 Mev.on the nuclei of oxygen,phosphorus,and sulfur was performed at the TANGRA facility at JINR(Dub.a).The experiment aimed to refine existing data and ob.ain new data on the yields and angular distrib.tions ofγ-quanta emitted b. the studied nuclei due to neutron-induced nuclear reactions using the tagged neutron *** types of detector systems were used to registerγ-***γ-ray yields were measured using a high-purity germanium(HPGe)*** angular distrib.tions ofγ-rays were ob.ained using a system of 18 scintillation detectors b.sed on b.smuth germanite b._(4)Ge_(3)O_(12)(b.O)located around the *** performed experiments measured the yields of two transitions for the reaction of tagged neutrons with 16O,nine transitions for the reaction with ^(31)P,and nine transitions for the reaction with ^(32)S for the first *** angular anisotropy of theγ-radiation accompanying the inelastic scattering of neutrons with an energy of 14.1 Mev.on ^(31)P nuclei was also measured for the first time.

关键词： tagged neutron method yields of gamma-quanta high-resolution gamma-spectrometry neutron-nuclear reactions neutron scattering

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Mn微合金化对Ti-Al-Mo-Zr-Fe-b.金组织演变和力学性能的影响

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稀有金属材料与工程 2024年第6期53卷 1555-1565页

作者：何苗霞燕迟董月成常辉 Alexandrov.igor v 南京工业大学材料科学与工程学院新材料研究院江苏南京211816 乌法理工大学材料科学与金属物理系俄罗斯乌法450008

通过OM、Eb.D和TEM等研究了Mn微合金化对新型近αTi-Al-Mo-Zr-Fe-b.金微观组织和力学性能的影响。结果表明:添加0.5%(质量分数)的Mn元素可以将合金的铸态微观组织从3.28μm细化到2.65μm,使其抗拉伸强度从882 MPa提高到966 MPa,但延伸... 详细信息

通过OM、Eb.D和TEM等研究了Mn微合金化对新型近αTi-Al-Mo-Zr-Fe-b.金微观组织和力学性能的影响。结果表明:添加0.5%(质量分数)的Mn元素可以将合金的铸态微观组织从3.28μm细化到2.65μm,使其抗拉伸强度从882 MPa提高到966 MPa,但延伸率从7.8%下降到5.1%。锻造后的2种合金的晶粒尺寸趋于一致,微观组织趋于等轴化且Mn微合金化后的组织更加均匀。锻造后,Ti-Al-Mo-Zr-Fe-b.金的抗拉伸强度和延伸率增加到966 MPa和16.4%,而含有0.5%(质量分数)Mn元素的合金具有更高的抗拉伸强度,达到了1079 MPa,同时延伸率达到了15.8%。结论表明,强度的提高可以归因于Mn元素的固溶强化效应,同时Mn微合金化处理使合金中的Al元素富集于α相,有利于提高合金的强度和塑性。

关键词： Mn微合金化近α钛合金组织演变力学性能

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Hyb.id b.metallic cluster ZrO2/Rh@N,S co-doped porous carb.n nanosheets for efficient hydrogen ev.lution in acid electrolytes

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Tungsten 2024年第4期6卷 657-662页

作者： Xin-Yi Zhang igor v.Zatov.ky Jun-Ming Cao Xing-Long Wu Faculty of Chemistry Northeast Normal University F.D.Ov.harenko Institute of b.ocolloidal Chemistry NAS Ukraine MOE Key Lab.ratory for Uv.Light-Emitting Materials and Technology Northeast Normal University

Acid hydrogen ev.lution reaction (HER) is a critical energy conv.rsion process,which is significantly important in hydrogen energy manufacturing and storage [1].Although the performance of nob.e metal platinum (Pt)-b.sed catalysts in acidic HER is well known,the challenges are high cost,limited reserv.s,poor stab.lity,and susceptib.lity to toxic sub.tances [2].Therefore,it is urgent to design and manufacture acidic HER catalysts with high reactiv.ty,high stab.lity,and low cost.

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Plant community on a v.lcano mountaintop rev.als unique high-altitude v.getation in southeastern b.azil

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Journal of Mountain Science 2024年第9期21卷 3018-3030页

作者： igor Musauer KESSOUS Ruy Josév.lka ALv.S Nílb.r Gonçalv.s da SILv. Amilcar Walter SAPORETTI JUNIOR b.odiv.rsity Lab.ratory Federal Institute of EducationScience and Technology of Southern Minas Gerais(IFSULDEMINAS)Av.Dirce Pereira Rosa300-Jardim Esperança37713-100Poços de CaldasMGBrazil Department of b.tany National MuseumFederal University of Rio de JaneiroQuinta da Boa Vista s.n.São Cristóvão20949-040Rio de JaneiroRJBrazil Gothenb.rg Glob.l b.odiv.rsity Centre Carl Skottsbergs Gata 22BSE 41319GothenburgSweden

Mountains exhib.t a high degree of endemism and div.rsity,howev.r,quantifying their b.odiv.rsity can b. *** to islands,species isolation in mountainous regions results in comparab.e patterns of ev.lution and extinction,rendering their b.odiv.rsity unique and highly susceptib.e to anthropogenic *** topographic relief in mountains plays a crucial role in creating hab.tat complexity,which in turn contrib.te to high plant ***,we inv.stigated plant div.rsity in the v.lcano mountaintop v.getation on the Poços de Caldas Plateau,a region situated in the ecotone b.tween the Atlantic Forest and Cerrado,characterized b. natural radiation and significant anthropogenic *** employed an automated approach through the filtering of georeferenced and non-georeferenced data to ob.ain a list of plant species in the ***,we statistically inv.stigated the similarity among different high-altitude v.getations b.longing to the campos de altitude from the Atlantic Forest and campos rupestres from the *** plateau exhib.ts high plant div.rsity,including 1,659 specific and infraspecific taxa,especially b.longing to Asteraceae and *** analyses suggest that geographical distance is a strong predictor of dissimilarity and that the Poços de Caldas Plateau is more floristically related to the campos rupestres,despite b.ing associated with campos de *** region possesses a unique set of b.odiv.rsity,indicating that it may b. a distinct ***,we hypothesize that Pleistocene ev.nts likely influenced the conformation of the current floristic composition in the region through species interchange b.tween the Cerrado and Atlantic *** study also highlights the few taxa assessed for conserv.tion status and anthropogenic threats that this hab.tat is facing.

关键词： Atlantic Forest b.ogeography Cerrado Community ecology Grassland

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熵增工程在电催化反应中的研究进展

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物理化学学报 2024年第7期40卷 36-42页

作者：张新义任楷刘妍宁谷振一黄志雄郑硕航王晓彤郭晋芝 igor v.Zatov.ky 曹峻鸣吴兴隆东北师范大学化学学院长春130024 东北师范大学紫外光发光材料与技术教育部重点实验室长春130024 乌克兰国家科学院生物胶体化学研究所乌克兰基辅03142

目前对高性能与高稳定性的电催化剂进行精准合成仍然是亟待解决的问题。熵作为是最重要的热力学参数之一,是描述体系无序程度的物理量,其数值主要由材料的结构、磁矩、原子和电子振动共同决定。根据体系的构型熵值,我们通常将材料分为... 详细信息

目前对高性能与高稳定性的电催化剂进行精准合成仍然是亟待解决的问题。熵作为是最重要的热力学参数之一,是描述体系无序程度的物理量,其数值主要由材料的结构、磁矩、原子和电子振动共同决定。根据体系的构型熵值,我们通常将材料分为低熵材料(ΔS_(mix)1.5R)。随着熵值的增加,材料本征的物理与化学性质也会随之发生相应的变化。得益于不同金属元素的共存,在界面处原子级的多组分排列,所产生的协同性高熵效应能够有效地提升电催化反应的活性,因此在电催化领域中得到了广泛的研究关注。本综述对高熵电催化剂的基本概念、合成路线(“自上而下”与“自下而上”)以及在不同电催化反应类型中的高熵材料结构与性能之间的构效关系进行了系统总结,主要包括析氢(HER)、析氧(OER)、氧还原(ORR)、醇氧化(AOR)、氮还原(NRR)和二氧化碳还原反应(CO_(2)RR)等,从而阐明熵增工程对高性能电催化剂设计与应用的优势与潜力。同时,针对目前高熵催化剂研究所面临的主要问题与挑战,对未来基于熵增工程的高熵电催化剂的设计思路与合成方法进行展望。

关键词：熵增合成电化学高熵催化剂电催化

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Fe Nanoclusters on the Ge（001） Surface Studied b. Scanning Tunneling Microscopy, Density Functional Theory Calculations and X-Ray Magnetic Circular Dichroism

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Nano Research 2011年第10期4卷 971-978页

作者： Olaf LUb.en Sergey A. Krasnikov.Alexei b. Preob.ajenski b.rry E. Murphy igor v. Shv.ts Centre for Research on Adaptiv. Nanostructures and Nanodev.ces （CRANN） School of Physics Trinity College Dublin Dublin 2 Ireland MAX-lab Lund University Box 118. 22100 Lund Sweden

The growth of Fe nanoclusters oN the Ge（001） surface has b.en studied using low-temperature scanning tunneling microscopy （STM） and density functional theory （DFT） calculations. STM results indicate that Fe nucleates on the Ge（001） surface, forming well-ordered nanoclusters of uniform size. Depending on the preparation conditions, two types of nanoclusters were ob.erv.d hav.ng either four or sixteen Fe atoms within a nanocluster. The results were confirmed b. DFT calculations. Annealing the nanoclusters at 420 K leads to the formation of nanorow structures, due to cluster mob.lity at such temperature. The Fe nanoclusters and nanorow structures formed on the Ge（001） surface show a superparamagnetic b.hav.our as measured b. X-ray magnetic circular dichroism.

关键词： Ge(001) iron nanoclusters self-assemb.y scanning tunnelling microscopy X-ray magnetic circular dichroism density functional theory calculations

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Progression of Cognitiv. Deficit in Older People with Mild Cognitiv. Impairment Treated with Cereb.olysin

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Health 2014年第19期6卷 2581-2591页

作者： Irina S. b.ksha Sv.tlana I. Gav.ilov. igor v. kolykhalov.iana b. fedorov. Iaroslav.b. Kalyn Natalia D. Seleznev. Andrei v. Samorodov.Serge N. Miasoedov.Elizab.ta b. Mukaetov.-Ladinska Lab.ratory of Neurochemistry Moscow Russia Department of Alzheimer’s Disease and Related Disorders Moscow Russia Department of b.oengineering and Medical Equipment and Systems Moscow State Technical University Moscow Russia Lab.ratory of b.ostatistics and Ev.dence b.sed Medicine Mental Health Research Center of Russian Academy of Medical Sciences Moscow Russia Institute of Neurocience Newcastle University Institute for Ageing Newcastle University Campus for Ageing and Vitality Newcastle upon Tyne UK

Ob.ectiv.s: Although people with amnestic mild cognitiv. impairment (aMCI) b.nefit from cereb.olysin treatment, some still dev.lop dementia. The aim of the current study was to identify most informativ. clinical assessment tests to predict the therapy efficacy in aMCI sub.ects treated with cereb.olysin. Methods: We studied patients with amnestic mild cognitiv. impairment (aMCI;n = 53) who had regular neurocognitiv. and clinical psychiatric assessments and were treated with cereb.olysin i.v. infusions 20 × 30 ml twice a year ov.r three years period. Data were analyzed using non-parametric statistics, cluster and linear discriminant analyses. Results: Comb.ned mathematical modeling enab.ed to predict cognitiv. decline from aMCI to dementia in the cereb.olysin-treated patients b.sed on their initial neurocognitiv. assessment scores. We identified a “dementia risk group” with fast cognitiv. decline (i.e. low efficacy of the treatment). Lower b.seline scores in the Mattis Dementia Rating Scale Memory sub.est, Mini-Mental State Examination (MMSE), 10 word list immediate recall, and Frontal Assessment b.ttery tests when accompanied b. higher depression score (Hamilton Depression Rating Scale) suggest poor prognosis for aMCI patients treated with cereb.olysin. Changes in scores on the MMSE, b.ston naming test, Digit span forward, and Wechsler scale sub.est “Categorical associations” during the treatment course are more characteristic for patients who conv.rt to dementia than their initial scores. Conclusions: aMCI sub.ects treated with cereb.olysin with lower b.seline cognitiv. functioning and sub.linical depression hav. poor prognosis in terms of conv.rting to dementia. Changes in the MMSE, b.ston naming test, Digit span forward, and Wechsler scale sub.est “Categorical associations” scores during the treatment course are more informativ. to identify patients who will dev.lop dementia than their initial scores.

关键词： Mild Cognitiv. Impairment Cereb.olysin Dementia Cluster Analysis Linear Discriminant Analysis

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Acoustics of a v.scoelastic medium with encapsulated b.b.les

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Journal of Hydrodynamics 2021年第1期33卷 55-62页

作者： Damir A.Gub.idullin Yuri v.fedorov Lab.ratory of Continuum Mechanics Institute of Mechanics and EngineeringFRC Kazan Scientific CenterRussian Academy of SciencesKazanRussia

In this paper,a modified Rayleigh-Lamb.equation is deriv.d that takes into account the radial v.b.ations of a gas b.b.le coated with a v.scoelastic shell and located in an elastic *** small oscillations of inclusion,the prob.em of heat exchange b.tween a gas,a liquid phase,a v.scoelastic shell,and an elastic medium is *** energy integral is *** the case of small disturb.nces,the dispersion relation is found from the Rayleigh-Lamb.equations,energy,and the known wav. equation for the b.b.ly *** analytical expression of the equilib.ium speed of sound is written out and its dependence on the size of the v.scoelastic shell and the disturb.nce frequency is *** example of a mixture of polydimethylsiloxane with air b.b.les coated with a rub.er shell illustrates the influence of the elasticity of the carrier medium and the shell of the b.b.les on the dependence of the phase v.locity and attenuation coefficient on the perturb.tion *** a mixture of water with air b.b.les coated with a rub.er shell,the influence of the dependences of the shear modulus and v.scosity of b.tyl rub.er on the frequency of disturb.nces at different temperature on the dispersion curv.s is shown.A comparison of the theory with experimental data is giv.n.

关键词： Acoustic wav. gas b.b.les v.scoelastic medium and shell shear modulus dispersion equation

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Dynamic magnetic hysteresis in a liquid suspension of acicular maghemite particles

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Particuology 2009年第6期7卷 451-458页

作者： b.onislav.E.Kashev.ky Sergey b.Kashev.ky igor v.Prokhorov A.v.Luikov.Heat and Mass Transfer Institute Belarus Academy of SciencesP.Brovka str.15Minsk 220072Belarus

This paper presents theoretical and experimental studies on the magnetodynamics and energy ab.orption in a dilute suspension of small ferromagnetic particles with magnetic hysteresis and mechanical mob.lity in an AC magnetic field. Experiments with 0.1% suspensions of acicular particles of gamma ferric oxide in solid and liquid matrices, sub.ected to a 430 Hz magnetic field with an intensity of up to 1200 Oe, rev.aled important role of particle mob.lity. The main qualitativ. and quantitativ. features of the phenomenon are in agreement with a model of joint magneto-mechanical dynamics of particles with a chain-of-spheres mode of incoherent magnetic rev.rsal.

关键词： High-coerciv. magnetic particles Magnetic suspensions Dynamic magnetic hysteresis

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Autoimmunity in acute ischemic stroke and the role of b.oodb.ain b.rrier: the dark side or the light one?

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Frontiers of Medicine 2019年第4期13卷 420-426页

作者： Nikolay v. Tsygan Alexandr P. Trashkov.igor v. Litv.nenko v.ktoriya A. Yakov.ev. Alexandr v. Ryab.sev.Andrey G. v.siliev.Leonid P. Churilov Department of Molecular and Radiation b.ophysics B.P. Konstantinov Petersburg Nuclear Physics Institute Gatchina Leningrad Region 188300 Russian Federation Department of Nerv.us Diseases S.M. Kirov Military Medical Academy Saint Petersburg 194044 Russian Federation Department of Experimental Pharmacology I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry Saint Petersburg 194223 Russian Federation Department of Pathological Physiology with the Course of Immunopathology Saint Petersburg State Pediatric Medical University Saint Petersburg Russian Federation Department of Pathology Laboratory of the Mosaic of Autoimmunity Saint Petersburg State University Saint Petersburg 199034 Russian Federation

This article presents a synopsis of the current data on the mechanisms of b.ood-b.ain b.rrier (b.b. alteration and autoimmune response in acute ischemic stroke. Most researchers confirm the relationship b.tween the sev.rity of immunob.ochemical changes and clinical outcome of acute ischemic stroke. Ischemic stroke is accompanied b. aseptic inflammation, which alters the b.ain tissue and exposes the co-stimulatory molecules of the immune system and the neuronal antigens. To date, b.b.is not considered the b.rder b.tween the immune system and central nerv.us system, and the local immune sub.ystems are found within and b.hind the b.b. b.b.disruption contrib.tes to the leakage of b.ain autoantigens and induction of secondary autoimmune response to neuronal antigens and long-term inflammation. Glymphatic system function is altered and jeopardized b.th in hemorrhagic and ischemic stroke types. The receptors of innate immunity (toll-like receptor-2 and toll-like receptor-4) are also inv.lv.d in acute ischemia-reperfusion injury. Immune response is related to the key processes of b.ood clotting and fib.inolysis. At the same time, the stroke-induced immune activ.tion may promote reparation phenomena in the b.ain. Sub.equent research on the reduction of the acute ischemic b.ain injury through the target regulation of the immune response is promising.

关键词： stroke b.ood-b.ain b.rrier autoimmunity innate immunity inflammation cell death

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