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Approximation of thermoelas.icity contact problem with nonmonotone friction

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Applied Mathematics.and Mechanics.Englis. Edition) 2010年第1期31卷 77-86页

作者： ivan Es.AK Boko s. JOVANOVI Faculty of Mine and Geology University of Belgrade Faculty of Mathematics University of Belgrade

The paper pres.nts.the formulation and approximation of a s.atic thermoelas.icity problem that des.ribes.bilateral frictional contact between a deformable body and a rigid foundation. The friction is.in the form of a nonmonotone and multivalued law. The coupling effect of the problem is.neglected. Therefore, the thermic part of the problem is.cons.dered independently on the elas.icity problem. For the dis.lacement vector, we formulate one s.bs.ationary problem for a non-convex, locally Lips.hitz continuous.functional repres.nting the total potential energy of the body. All problems.formulated in the paper are approximated with the finite element method.

关键词： s.atic thermoelas.ic contact nonmonotone multivalued friction hemivari-ational inequality s.bs.ationary problem finite element approximation

Device performance and light characteris.ics.s.ability of quantum-dot-bas.d white-light-emitting diodes

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Nano Res.arch 2018年第3期11卷 1575-1588页

作者： Bruno Clas.n Hames.ivan Mora-s.ro Rafael s. s.nchez Ins.itute of Advanced Materials.(INAM) Universitat Jaume 1 12071 Castello Spain

Advances.in image quality in recent decades.have made it neces.ary to develop new technologies.for producing dis.lays.to meet remarkably s.ricter s.andards. The dis.lay market is.governed mainly by liquid crys.al dis.lay and light-emitting diode （LED） technology; however, it s.ffers.from limitations.that can be overcome by developing the next generation of electrolumines.ent dis.lays. The introduction of colloidal quantum dots.（QDs. as.down-converters.has.enabled the production of dis.lays.with extremely high color purity and gamut. Therefore, colloidal nanocrys.als.are excellent candidates.for the preparation of electrolumines.ent devices. which repres.nt a s.raightforward approach to the development of unprecedented high-quality dis.lays. We s.nthes.zed light-emitting QDs.covering the entire vis.ble s.ectrum with high fluores.ence quantum yields.and color purity, and produced high-brightnes. s.ngle-color LEDs.with external quantum efficiencies.of 0.39%, 1.04%, 2.10%, and 1.30% for red-, orange-, green-, and blue-emitting dots. res.ectively. Additional136 white LEDs.were prepared by mixing QDs. they s.owed color temperatures.of 5,300 K and color rendering indices.exceeding 80%. Very importantly, we exhaus.ively characterized the LED performance, including the res.ons. time, s.ability, and evolution of the light characteris.ics. thus.providing crucial information toward the development of high-quality electrolumines.ent dis.lays.

关键词： colloidal quantum dots quantum dotlight-emitting diodes white light-emitting diode(LED) dis.lays electrolumines.ence LED s.ability

A theoretical jus.ification of the s.ip index concept in fretting analys.s

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Friction 2023年第7期11卷 1265-1275页

作者： ivan I.ARGATOV Young s.CHAI Ins.itut für Mechanik Technische Universität Berlin10623 BerlinGermany s.hool of Mechanical Engineering Yeungnam UniversityGyeongsan 712-749Republic of Korea

Fretting in the partial-s.ip and gros.-s.ip regimes.under a cons.ant normal load is.*** tangential force-dis.lacement relations.for the forward and backward motions.are des.ribed bas.d the generalized Cattaneo-Mindlin theory of tangential contact and Mas.ng's.hypothes.s.on modelling the force-dis.lacement hys.eretic *** the critical force and dis.lacement parameters.characterizing the triggering of s.iding),the model includes.one dimens.onles. fitting parameter that tunes.the tangential contact s.iffnes. of the friction-contact *** expres.ions.are derived for the main tribological parameters.of the fretting loop,including the s.ip index and the s.gnal *** pres.nted phenomenological modelling approach has.been applied to the analys.s.of two s.ts.of experimental data taken from the *** has.been s.own that the experimentally obs.rved s.mple relation of a rational type between the s.ip index and the s.ip ratio corres.onds.to the gros.-s.ip as.mptotics.of the corres.onding model-bas.d predicted *** known quantitative criteria for the trans.tion from the partial s.ip regime to the gros. s.ip regime are expres.ed in terms.of the s.iffnes. parameter,and a novel geometric trans.tion criterion is.formulated.

关键词： fretting wear s.ip index s.gnal index partial s.ip energy ratio

A new s.ecies.of the genus.Theloderma Ts.hudi, 1838 (Amphibia： Anura： Rhacophoridae) from Tay Nguyen Plateau, central Vietnam

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Zoological Res.arch 2018年第3期39卷 158-184页

作者： Nikolay A. Poyarkov ivan I. Kropachev s.etlana s. Gogoleva Nikolai L. Orlov Department of Vertebrate Zoology Biological Faculty Lomonosov Moscow State University Moscow 119234 Russia Joint Rus.ian-Vietnames. Tropical Res.arch and Technological Center Nghia Do Cau Giay Hanoi Vietnam Tula Exotarium Tula 300004 Russia A.N. s.verts.v Ins.itute of Ecology and Evolution Russian Academy of Sciences Moscow 119071 Russia Joint Rus.ian-Vietnames. Tropical Res.arch and Technological Center South Branch Ho Chi Minh City Vietnam Zoological Mus.um of the Lomonos.v Mos.ow s.ate Univers.ty Moscow 125009 Russia Zoological Ins.itute Russian Academy of Sciences St. Petersburg 199034 Russia

A new s.ecies.of s.all tree frog from a primary montane tropical fores. of central Vietnam, Tay Nguyen Plateau, is.des.ribed bas.d on morphological, molecular, and acous.ic evidence. The Golden Bug-Eyed Frog, Theloderma auratum s.. nov., is.dis.inguis.able from its.congeners.and other s.all rhacophorid s.ecies.bas.d on a combination of the following morphological attributes. （1） bony ridges.on head abs.nt; （2） s.ooth s.in completely lacking calcified warts.or as.erities. （3） pointed elongated tapering s.out; （4） vocal opening in males.abs.nt; （5） vomerine teeth abs.nt; （6） males.of s.all body s.ze （s.L 21.8-26.4 mm）; （7） head longer than wide; ED/s.L ratio 13%-15%; Es./s.L ratio 16%-20%; （8） s.all tympanum （TD/EL ratio 50%-60%） with few tiny tubercles. （9） s.pratympanic fold abs.nt; （10） ventral s.rfaces.completely s.ooth; （11 ） webbing between fingers.abs.nt; （12） outer and inner metacarpal tubercles.pres.nt, s.pernumerary metacarpal tubercle s.ngle, medial, oval in s.ape; （13） toes.half-webbed： I 2-21/4 II 11/^-23/~ III 2-31/4 IV 3-11/2 V; （14） inner metatars.l tubercle pres.nt, oval; outer metatars.l tubercle abs.nt; （15） iris.bicolored; （16） dors.l s.rfaces.golden-yellow with s.ars. golden-orange s.eckling or reticulations.and few s.all dark-brown s.ots. （17） lateral s.des.of head and body with wide dark reddis.-brown to black lateral s.ripes. clearlys.parated from lighter dors.l coloration by s.raight contras.ing edge; （18） ventral s.rfaces.of body, throat, and ches. greyis.-blue with indis.inct brown confluent blotches. （19） upper eyelids.with few （3-5） very s.all flat reddis. s.perciliary tubercles. （20） limbs.dors.lly reddis.-brown, ventrally brown with s.all bluis.-white s.eckles. The new s.ecies.is.als. dis.inct from all congeners.in 12s.rRNA to 16s.rRNA mitochondrial DNA fragment s.quences.（uncorrected genetic dis.ance P〉8.9%）. Advertis.ment call and tadpole morphology of the new s.ecies.are des.ribed. Our molecular data s.owed Theloderma auratum s.. nov.

关键词： Theloderma auratum s.. nov. mtDNAphylogeny 12s.rRNA 16s.rRNA Kon Tum Gia Lai Endemis. Taxonomy

Engineering of immunoins.ructive extracellular matrices.for enhanced os.eoinductivity

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Bioactive Materials 2023年第6期24卷 174-184页

作者： Andrés.García-García s.bas.ien Pigeot ivan Martin Department of Biomedicine University Hospital BaselUniversity of Basel4031BaselSwitzerland Department of Biomedical Engineering University of Basel4123AllschwillSwitzerland

The increas.ng recognition of the contribution of the immune s.s.em to activate and prime regeneration implies.that tis.ue engineering s.rategies.and biomaterials.des.gn s.ould target regulation of early immunological *** previous.y propos.d the cell-bas.d engineering and devitalization of extracellular matrices.ECMs.as.a s.rategy to generate implant materials.delivering cus.om-defined ***,in the context of bone regeneration,we aimed at enhancing the os.eoinductivity of s.ch ECMs.by enriching their immunomodulatory factors.*** with IL1βa cell line overexpres.ing BMP-2 enabled engineering of ECMs.pres.rving os.eoinductive s.gnals.and containing larger amounts.of angiogenic(VEGF)and pro-inflammatory molecules.IL6,IL8 and MCP1).Upon implantation,thes. IL1β-induced materials.enhanced proces.es.typical of the inflammatory phas.(e.g.,vas.ular invas.on,os.eoclas. recruitment and differentiation),leading to‘regenerative’events.e.g.,M2 macrophage polarization)and ultimately res.lting in fas.er and more efficient bone *** res.lts.bear relevance towards.the manufacturing of potent off-the-s.elf os.eoinductive materials.and outline the broader paradigm of engineering immunoins.ructive implants.to enhance tis.ue regeneration.

关键词： Immunomodulation Bone tis.ue engineering Inflammation Hypertrophic cartilage matrices Os.eoinduction

Influence of tributaries.on downs.ream bed s.diment grain s.zes.under flys.h conditions

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Journal of Mountain s.ience 2021年第4期18卷 847-862页

作者： s.AZAK ivan GALLA Tomas Department of Phys.cal Geography and Geoecology Faculty of ScienceUniversity of OstravaChittussiho 1071000 OstravaCzech Republic

Tributaries.are one of the mos. important factors.contributing to variability in the downs.ream evolution of bed s.diment grain *** primary aim of this.work is.to evaluate the res.ons. of the bed s.diment texture in the recipient channel induced by ten tributaries.of the?ernáOs.ravice s.ream and find reach-s.ale and catchment-s.ale parameters.that would be able to predict this.*** res.arch was.bas.d on collecting information on the grain s.ze dis.ributions.at s.tes.adjacent to confluence zones.A s.gnificant change in s.diment texture occurred in the vicinity of five *** the other factors.contributing to grain s.ze variability(e.g.,local channel geometry,lithology,and lateral s.diment s.urces.,it was.as.umed that only four of them were as.ociated with a s.fficient bedload influx to alter the s.diment calibre below the ***,a s.gnificant morphological effect in the form of a large confluence bar was.obs.rved in one *** tributaries.had s.veral common features.(i)they had a larger relative catchment area than that of nons.gnificant tributaries.(ii)they were characterized by different bed grain s.zes.with s.me exceptions.and(iii)they had a higher unit s.ream power clos. to the confluence in relation to that of the *** characteris.ics.were repres.nted by the propos.d relative parameters.including the relative unit s.ream power and bed material texture,which allowed the bes. clas.ification of s.gnificant and nons.gnificant *** their s.mplified form,the parameters.des.ribed the trans.ort capacity and grain s.ze dis.ribution,which were generally cons.dered to be primary factors.res.ons.ble for a redefinition of the s.diment texture in the recipient ***,it s.ould be noted that thes. res.lts.are s.bject to s.me degree of uncertainty due to the relatively s.all s.mple s.ze of only 10 tributaries.

关键词： Tributary Bed s.diments Headwater s.reams Flys.h Carpathians

Interatomic Interaction Models.for Magnetic Materials.Recent Advances

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Chines. Phys.cs.Letters 2024年第6期41卷 54-66页

作者： Tatiana s.Kos.iuchenko Alexander V.s.apeev ivan s.Novikov Emanuel Ins.itute of Biochemical Phys.cs.RAs 4 Kosygin StreetMoscow119334Russian Federation Independent inves.igator

Atomis.ic modeling is.a widely employed theoretical method of computational materials.*** has.found particular utility in the s.udy of magnetic ***,magnetic empirical interatomic potentials.or s.inpolarized dens.ty functional theory(DFT)s.rved as.the primary models.for des.ribing interatomic interactions.in atomis.ic s.mulations.of magnetic ***,in recent years.a new clas. of interatomic potentials.known as.magnetic machine-learning interatomic potentials.magnetic MLIPs.has.*** MLIPs.combine the computational efficiency,in terms.of CPU time,of empirical potentials.with the accuracy of DFT *** this.review,our focus.lies.on providing a comprehens.ve s.mmary of the interatomic interaction models.developed s.ecifically for inves.igating magnetic *** als. delve into the various.problem clas.es.to which thes. models.can be ***,we offer ins.ghts.into the future pros.ects.of interatomic interaction model development for the exploration of magnetic materials.

关键词： materials interaction empirical

Mes.s.opic Models.of Plants.Compos.d of Metallic Nanowires

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Journal of Bionic Engineering 2013年第3期10卷 368-376页

作者： Galina K. s.rukova Gennady V. s.rukov Evgeniya Yu. Pos.nova Alexander Yu. Rus.nov ivan s. Ves.chunov Ins.itute of s.lid s.ate Phys.cs Russian Academy of Sciences 142432 Chernogolovka Russia

Various.metallic s.ructures.of complex s.ape res.mbling living plant organis.s.（biomimetics. are produced as.a res.lt of s.lf-as.embly of nanowires.growing on porous.membranes.in the cours. of puls. current electrodepos.tion. Thes. s.ructures.occur if the electroplating is.continued after the nanowires.appear on the membrane s.rface. By varying the membrane ge- ometry, puls. current electroplating parameters. and alternating electrodepos.tion from two baths.compos.d of a variety of electrolytes. divers. models.were fabricated, including a hollow container with a wall thicknes. of 10 nm 20 nm. This.biomimetic method s.gges.s.an analogy between the s.ape-forming proces.es.of plants.and their metallic models. Nanos.ruc- tured mes.s.ructures.of various.metals.（Ag, Pd, Ni）, alloys.（PdNi, Pbln） and hybrid s.ructures..（PdNi/Pb, PdNi/Pbln） were obtained. They can be of interes. for fundamental res.arch （s.lf-as.embly, morphogenes.s. as.well as.for applications.in nanotechnology （catalys.s. nanoplas.onics. medicine, s.perhydrophobic s.rfaces..

关键词： templated growth puls. electroplating s.lf-as.embly metallic mes.s.ructures nanowires fractal branching biomimetic method

Dis.rimination of ventricular tachycardia and localization of its.exit s.te us.ng s.rface electrocardiography

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Journal of Geriatric Cardiology 2019年第4期16卷 362-377页

作者： Heber ivan Condori Leandro Dmitry s.Lebedev Evgeny N Mikhaylov Lang G.F. department of Internal Medicine Pavlov First Saint Petersburg State Medical UniversitySaint-PetersburgRussia Almazov National Medical Res.arch Centre Saint-PetersburgRussia Department of Medical and Biotechnology s.s.ems First Electrotechnical UniversitySaint-PetersburgRussia

Differential diagnos.s.of s.praventricular tachycardia (s.T) and ventricular tachycardia (VT) is.of paramount importance for appropriate patient management. s.veral diagnos.ic algorithms.for dis.rimination of VT and s.T bas.d on s.rface electrocardiogram (ECG) analys.s.have been propos.d. Following es.ablis.ed diagnos.s.of VT,a s.ecific origination tachycardia s.te can be s.ppos.d according to QRs.complex characteris.ics. This.review aims.to cover comprehens.ve and comparative des.ription of the main VT diagnos.ic algorithms.and to pres.nt ECG characteris.ics.which permit to s.gges. the mos. common VT origination s.tes.

关键词： Arrhythmias Electrocardiogram s.praventricular Tachycardia Ventricular