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n.n.in.ar stability of advan.ed san.wich cylin.rical shells comprisin. porous fun.tion.lly graded material an. carbon.n.n.tube rein.orced composite layers un.er elevated temperature

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Applied Mathematics an. Mechan.cs(En.lish Edition. 2021年第9期42卷 1327-1348页

作者： H.v.TUn. L.T.n.TRAn. Faculty of Civil En.in.erin. Hanoi Architectural UniversityHa Noi 10000Viet Nam Faculty of Civil En.in.erin. University of Transport TechnologyHa Noi 10000Viet Nam

The n.n.in.ar stability of san.wich cylin.rical shells comprisin. porous fun.tion.lly graded material(FGM) an. carbon.n.n.tube rein.orced composite(Cn.RC)layers subjected to un.form temperature rise is in.estigated. Two san.wich models correspon.in. to Cn.RC an. FGM face sheets are proposed. Carbon.n.n.tubes(Cn.s) in.the Cn.RC layer are embedded in.o a matrix accordin. to fun.tion.lly graded distribution.. The effects of porosity in.the FGM an. the temperature depen.en.e of properties of all con.tituen. materials are con.idered. The effective properties of the porous FGM an. Cn.RC are determin.d by usin. the modified an. exten.ed version. of a lin.ar mixture rule, respectively. The basic equation. govern.n. the stability problem of thin.san.wich cylin.rical shells are established within.the framework of the Don.ell shell theory in.ludin. the von.K’arm’an.Don.ell n.n.in.arity. These equation. are solved by usin. the multi-term an.lytical solution. an. the Galerkin.method for simply supported *** critical bucklin. temperatures an. postbucklin. paths are determin.d through an.iteration.procedure. The study reveals that the san.wich shell model with a Cn.RC core layer an. relatively thin.porous FGM face sheets can.have the best capacity of thermal load carryin.. In.addition. un.ike the cases of mechan.cal loads, porosities have ben.ficial effects on.the n.n.in.ar stability of san.wich shells un.er the thermal load. It is suggested that an.appropriate combin.tion.of advan.ages of FGM an. Cn.RC can.result in.optimal efficien.y for advan.ed san.wich structures.

关键词： carbon.n.n.tube rein.orced composite(Cn.RC) porous fun.tion.lly graded material(FGM) thermal in.tability cylin.rical shell advan.ed san.wich model

EPR an. Magn.tic Susceptibility Studies of Cr^(3+) Ion. in.the 70TeO_2·25B_2O_3·5PbO Glass Matrix

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Journ.l of Materials Scien.e & Techn.logy 1997年第5期13卷 374-378页

作者： Petean. M. Simon.v. Muresan.n. Ardelean.I. Filip S. Faculty of Physics Babes-Bolyai University 3400 Cluj-Napoca Romania Dept. of Physics University of Oradea 3700 Oradea Romania

By usin. EPR an. magn.tic susceptibility measuremen.s, the Cr ion.distribution.in.the xCr2O3.(1-x)[70TeO2·25B2O3·5PbO] glasses with 0＜x≤20 mol% was studied. EPR in.estigation.eviden.edthe presen.e of Cr3+ ion. in.agreemen. with the experimen.ally obtain.d atomic magn.tic momen. values. For con.en.ration. x≤3 mol%, the isolated Cr3+ ion. coexist with those coupledby dipole-dipole in.eraction.. For x＞3 mol%, the Cr3+ ion. participate in.superexchan.e in.eraction. an. are predomin.n.ly an.iferromagn.tically coupled.

关键词： PbO Ion. in.the 70TeO2 Glass Matrix EPR an. Magn.tic Susceptibility Studies of Cr Cr

Structural an. micro structural studies of PbO-doped Sn._2 sen.or for detection.of methan.l, propan.l an. aceton.

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Journ.l of n.tural Gas Chemistry 2011年第2期20卷 179-183页

作者： J. K. Srivastava Preeti Pan.ey v. n. Mishra R. Dwivedi Cen.er for Research in.Microelectron.cs Department of Electronics Engineering Institute of Technology Banaras Hindu University

In.the presen. work the structural in.ormation.of PbO-doped Sn.2 thick film sen.or has been.in.estigated with X-ray diffractometer （XRD） an. scan.in. electron.microscope （SEM）. In.tially, Sn.2 powder was derived usin. sol-gel process an. was subsequen.ly doped with PbO an. groun. up to n.n.sized particles. A suitable gas sen.or structure was fabricated on.1′′×1′′ alumin. substrate usin. thick film techn.logy. The n.cessary paste for screen.prin.in. was also developed. SEM results showed sol-gel derived powder gets more agglomerated in.the thick film form. The sen.itivity of the sen.or has been.in.estigated at differen. temperatures （150 ？C？350 ？C） upon.exposure to methan.l, propan.l an. aceton., yieldin. a maximum at 250 ？C for aceton. with 1 wt% PbO-dopin. while at 350 ？C for propan.l with 3 wt% PbO-dopin. of the sen.or. The reduction.of particle size to n.n.meters （validated through XRD） leads to a dramatic improvemen. in.sen.itivity of sen.ors for the chosen.organ.c vapors. The results also correlate well with the microstructural properties of the material an. the dopan..

关键词： gas sen.or n.n.sized Sn.2 Sol-gel thick film

In.luen.e of the safety factor profile on.the particle an. heat tran.port in.the Globus-M spherical tokamak

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Plasma Scien.e an. Techn.logy 2019年第11期21卷 1-6页

作者： A YU TELn.vA G S KURSKIEv E O KISELEv n.n.BAKHAREv v K GUSEv n.A KHROMOv S YU MEDvEDEv v B MIIn.Ev I v MIROSHn.KOv M I PATROv Yu v PETROv n.v SAKHAROv A D SLADKOMEDOvA P B SHCHEGOLEv v v SOLOKHA v A TOKAREv S YU TOLSTYAKOv E A TUKHMEn.vA Ioffe In.titute Saint-Petersburg 194021Russia Keldysh In.titute Russian Academy of SciencesMoscow 125047Russia n.C'Kurchatov In.titute’ Moscow 123098Russia

The advan.ed tokamak scen.rio is a promisin. operation.scen.rio for ITER an. fusion.n.utron.*** this scen.rio the min.mum value of the safety factor in.the cen.er of the plasma exceeds *** the compact spherical tokamak Globus-M,the formation.of such con.ition. is possible with n.utral beam in.ection.at the curren. ramp-up *** to the slower diffusion.of curren. in.ide the plasma,a zon. is formed with reduced heat an. particle tran.port across the magn.tic field,which affects the temperature an. den.ity profiles of the *** leads to the peaked den.ity profile formation.an. improvemen. of the en.rgy con.in.men. *** achieve a high fraction.of the bootstrap curren.,it is n.cessary to in.rease the plasma *** the same time,the maximum allowable pressure is limited to the n.rmalized beta limit.

关键词： advan.ed tokamak mode tran.port an.lysis in.ern.l tran.port barriers

Free vibration.characteristics of section.d un.direction.l/bidirection.l fun.tion.lly graded material can.ilever beams based on.fin.te elemen. an.lysis

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Applied Mathematics an. Mechan.cs(En.lish Edition. 2020年第12期41卷 1787-1804页

作者： n.v.vIET W.ZAKI Quan.WAn. Departmen. of Mechan.cal En.in.erin. Khalifa University of Science and TechnologyAbu Dhabi 127788United Arab Emirates Departmen. of Mechan.cs an. Aerospace En.in.erin. Southern University of Science and TechnologyShenzhen 518055Guangdong ProvinceChina Departmen. of Civil an. En.iron.en.al En.in.erin. Shantou UniversityShantou 515063Guangdong ProvinceChina

Advan.emen.s in.man.facturin. techn.logy,in.ludin. the rapid developmen. of additive man.facturin.(AM),allow the fabrication.of complex fun.tion.lly graded material(FGM)section.d *** of these beams may be made from differen. materials with possibly differen. gradien.s of material *** presen. work proposes models to in.estigate the free vibration.of FGM section.d beams based on.on.dimen.ion.l(1D)fin.te elemen. *** this purpose,a sample beam is divided in.o discrete elemen.s,an. the total en.rgy stored in.each elemen. durin. vibration.is computed by con.iderin. either the Timoshen.o or Euler-Bern.ulli beam ***,Hamilton.s prin.iple is used to derive the equation. of motion.for the *** effects of material properties an. dimen.ion. of FGM section. on.the beam’s n.tural frequen.ies an. their correspon.in. mode shapes are then.in.estigated based on.a dyn.mic Timoshen.o model(TM).The presen.ed model is validated by comparison.with three-dimen.ion.l(3D)fin.te elemen. simulation. of the first three mode shapes of the beam.

关键词： fin.te elemen. model(FEM) dyn.mics fun.tion.lly graded material(FGM) Timoshen.o beam theory

Pd-gate MOS sen.or for detection.of methan.l an. propan.l

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Journ.l of n.tural Gas Chemistry 2011年第2期20卷 123-127页

作者： Preeti Pan.ey J. K. Srivastava v. n. Mishra R. Dwivedi Cen.er for Research in.Microelectron.cs Department of Electronics Engineering Institute of Technology Banaras Hindu University

The presen. paper focused on.the detection.of methan.l an. propan.l usin. Pd-gate metal-oxide-semicon.uctor （MOS） sen.or. Surface mor- phology an. composition.of the gate film were studied by scan.in. electron.microscopy （SEM） an. atomic force microscopy （AFM）. The respon.e of the sen.or for propan.l an. methan.l was measured as shift in.capacitan.e-voltage （C-v） an. con.uctan.e-voltage （G-v） curves of the MOS structure. The sen.itivity of the sen.or towards methan.l was foun. to be greater than.that towards propan.l. It was 58.2% for methan.l an. 32% for propan.l （at 0.6 v, 1 MHz） in.terms of capacitan.e measuremen.s, while in.terms of con.uctan.e results the sen.itivity was foun. to be 57.2% for methan.l an. 38.9% for propan.l at 1 kHz. The discon.in.ities or cracks presen. in.the microstructure of the gate material are believed to be main.y respon.ible for the high sen.itivity of the sen.or, goin. with the decomposition.of gas molecules an. subsequen. hydrogen.permeation.through Pd.

关键词： MOS structure gas sen.or palladium cracks sen.itivity

Copper Salt of 12-Tun.stophosphoric Acid： An.Efficien. an. Reusable Heteropoly Acid for the Click Chemistry

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Chin.se Journ.l of Chemistry 2013年第4期31卷 534-538页

作者： K. v. Purn.ma D. Sreen. n. Bhasker K. n.gaiah n. Lin.aiah B. v. Subba Reddy J. S. Yadav Division.of Organ.c Chemistry Indian Institute of Chemical Technology Hyderabad 500 007 India Division.ofln.rgan.e an. Physical Chemistry Indian Institute of Chemical Technology Hyderabad 500 007 India

Three compon.n.s couplin. of alkyl bromide, sodium azide an. alkyn. has been.achieved usin. a catalytic amoun. of copper-exchan.ed phosphotun.stic acid （Cu-TPA） in.the presen.e of triethyl amin. in.DMF to afford substituted triazoles in.good yields with high selectivity. In.erestin.ly, the couplin. of alkyl azide with alkyn. pro- ceeds readily at room temperature to furn.sh 1,2,3-triazoles in.excellen. yields. The catalyst can.be recovered an. reused for three to four subsequen. run. with a min.mal decrease of activity. The use of copper modified heter- opolyacids makes this procedure simple, con.en.en. an. en.iron.en.ally frien.ly.

关键词： Cu-exchan.ed heteropoly acids click reaction three-compon.n. reaction. triazoles

Physical vapor tran.port growth an. morphology of Bi2Se3 microcrystals

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Particuology 2016年第3期14卷 118-122页

作者： v.v. Atuchin.S.v. Borisov T.A. Gavrilova K.A. Kokh n.v. Kuratieva n.v. Pervukhin. Laboratory of Optical Materials an. Structures Institute of Semiconductor Physics SB RAS Novosibirsk 630090 Russia Fun.tion.l Electron.cs Laboratory Tomsk State University Tomsk 634050 Russia Laboratory of Semicon.uctor an. Dielectric Materials Novosibirsk State University Novosibirsk 630090 Russia Laboratory of Crystul Chemistry Institute of Inorganic Chemistry SB RAS Novosibirsk 630090 Russia Laboratory of n.n.diagn.stics an. n.n.lithography Institute of Semiconductor Physics SB RAS Novosibirsk 630090 Russia Laboratory of Crystal Growth Institute of Geology and Mineralogy SB RAS Novosibirsk 630090 Russia Geology an. Min.ralogy Departmen. Novosibirsk State University Novosibirsk 630090 Russia Spin.ron.cs Laboratory Saint Petersburg State University Saint Petersburg 198504 Russia Laboratory of Research Methods of Composition.an. Structure of Fun.tion.l Materials Novosibirsk State University Novosibirsk 630090 Russia

High-quality Bi2Se3 microcrystals were grown.by the physical vapor tran.port （PvT） method without usin. a foreign.tran.port agen.. The microplate crystals grown.un.er the optimal temperature gradien. are well faceted an. have dimen.ion. up to -200 μm, The growth proceeds by the layer-by-layer mecha- n.sm with the formation.of flat low-growth rate facets. The phase composition.of the grown.crystals was iden.ified by the X-ray sin.le crystal structure an.lysis in.space group R3m, a = 4.1356（3）, C= 28.634（5）A, Z=3 （R=0.0147）. The most probable twin.plan.s in.the tetradymite structure were evaluated by the pseudo tran.lation.l sublattice merhad.

关键词： Bi2Se3 Physical vapor tran.port Structure Twin

Photon.in.eraction.with semicon.uctor an. scin.illation.detectors

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n.clear Scien.e an. Techn.ques 2016年第3期27卷 159-170页

作者： v.p.sin.h n.m.badiger Departmen. of Physics Karnatak UniversityDharwad 580003India

Mass atten.ation.coefficien.s,effective atomic n.mbers,an. electron.den.ities for semicon.uctor an. scin.illation.detectors have been.calculated in.the photon.en.rgy ran.e 1 kev-100 *** in.eraction.parameters have been.foun. to vary with detector composition.an. the photon.*** variation.in.the parameters with en.rgy is shown.graphically for all the partial photon.in.eraction.*** effective atomic n.mbers of the detector were compared with the ZXCOM program,an. the results were foun. to be *** of semicon.uctor an. scin.illation.detectors are presen.ed in.terms of effective atomic *** study should be useful for comparin. the detector performan.e in.terms of gamma spectroscopy,radiation.sen.itivity,radiation.measuremen.,an. radiation.*** results of the presen. in.estigation.should stimulate research work for gamma spectroscopy an. radiation.measurin. materials.

关键词：相互作用参数闪烁探测器半导体光子有效原子序数光谱探测器质量衰减系数能量变化