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A Study on the Wear Behaviour of Dual Phase Steels

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Journal of materials Science & Technology 2007年第1期23卷 107-110页

作者： V.Abouei H.Saghafian sh.Kheirandish Kh.Ranjbar Department of metallurgy and materials Engineering Iran University of Science and TechnologyIran shahid chamran University Iran

Dual phase （DP） steels containing four different amounts of martensite ranging from 43 vol. pct to 81 vol. pct have been developed from 0.2 wt pct carbon steel by intercritical heat treatment at a fixed temperature of 780℃ with varying holding times followed by water quenching. Dry sliding wear tests have been conducted on DP steels using a pin- on-disk machine under different normal loads of 61.3, 68.5, 75.7 and 82.6 N and at a constant sliding speed of 1.20 m/s. At these loads, the mechanism of wear is primarily delamination, which has been confirmed by SEm micrographs of subsurface and wear debris of samples. Wear properties have been found to improve with the increase in martensite volume fraction in dual phase steels.

关键词： Wear Dual phase steel microstructure

Amplitude analysis of the decays D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)

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chinese Physics C 2024年第8期48卷 6-33页

作者： m.Ablikim m.N.Achasov P.Adlarson O.Afedulidis X.C.Ai R.Aliberti A.Amoroso Q.An Y.Bai O.Bakina I.Balossino Y.Ban H.-R.Bao V.Batozskaya K.Begzsuren N.Berger m.Berlowski m.Bertani D.Bettoni F.Bianchi E.Bianco A.Bortone I.Boyko R.A.Briere A.Brueggemann H.Cai X.Cai A.Calcaterra g.F.Cao N.Cao S.A.Cetin J.F.chang W.L.chang g.R.che g.chelkov C.chen C.H.chen chao chen g.chen H.S.chen m.L.chen S.J.chen S.L.chen S.m.chen T.chen X.R.chen X.T.chen Y.B.chen Y.Q.chen Z.J.chen Z.Y.chen S.K.choi X.chu g.Cibinetto F.Cossio J.J.Cui H.L.Dai J.P.Dai A.Dbeyssi R.E.de Boer D.Dedovich C.Q.Deng Z.Y.Deng A.Denig I.Denysenko m.Destefanis F.De mori B.Fang S.S.Fang W.X.Fang Y.Fang Y.Q.Fang R.Farinelli L.Fava F.Feldbauer g.Felici C.Q.Feng J.H.Feng Y.T.Feng K.Fischer m.Fritsch C.D.Fu J.L.Fu Y.W.Fu H.gao Y.N.gao Yang gao S.garbolino I.garzia P.T.ge Z.W.ge C.geng E.m.gersabeck B.Ding X.X.Ding Y.Ding Y.Ding J.Dong L.Y.Dong m.Y.Dong X.Dong m.C.Du S.X.Du Z.H.Duan P.Egorov Y.H.Fan J.Fang JA.gilman K.goetzen L.gong W.X.gong W.gradl S.gramigna m.greco m.H.gu Y.T.gu C.Y.guan Z.L.guan A.Q.guo L.B.guo m.J.guo R.P.guo Y.P.guo A.guskov J.gutierrez K.L.Han T.T.Han X.Q.Hao F.A.Harris K.K.He K.L.He F.H.Heinsius C.H.Heinz Y.K.Heng C.Herold T.Holtmann P.C.Hong g.Y.Hou X.T.Hou Y.R.Hou Z.L.Hou B.Y.Hu H.m.Hu J.F.Hu T.Hu Y.Hu g.S.Huang K.X.Huang L.Q.Huang X.T.Huang Y.P.Huang T.Hussain F.H\"olzken N.H\"usken N.in der Wiesche m.Irshad J.Jackson S.Janchiv J.H.Jeong Q.Ji Q.P.Ji W.Ji X.B.Ji X.L.Ji Y.Y.Ji X.Q.Jia Z.K.Jia D.Jiang H.B.Jiang P.C.Jiang S.S.Jiang T.J.Jiang X.S.Jiang Y.Jiang J.B.Jiao J.K.Jiao Z.Jiao S.Jin Y.Jin m.Q.Jing X.m.Jing T.Johansson S.Kabana N.Kalantar-Nayestanaki X.L.Kang X.S.Kang m.Kavatsyuk B.C.Ke V.Khachatryan A.Khoukaz R.Kiuchi O.B.Kolcu B.Kopf m.Kuessner X.Kui A.Kupsc W.K\"uhn J.J.Lane P.Larin L.Lavezzi T.T.Lei Z.H.Lei H.Leithoff m.Lellmann T.Lenz C.Li C.Li C.H.Li cheng Li D.m.Li F.Li g.Li H.Li H.B.Li H.J.Li H.N.Li Hui Li J.R.Li J.S.Li K.Li L.J.Li L.K.Li Lei Li m.H.Li P.R.Li Q.m.Li Q.X.Li R.Li S.X.Li T.Li W.D.Li W.g.Li X.Li X.H.Li X.L.Li X.Y.Li Y Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Beihang University Beijing 100191China Bochum Ruhr-University D-44780 BochumGermany Budker Institute of Nuclear Physics SB RAS(BINP) Novosibirsk 630090Russia Carnegie mellon University PittsburghPennsylvania 15213USA Central china Normal University Wuhan 430079China Central South University Changsha 410083China china Center of Advanced Science and Technology Beijing 100190China china University of geosciences Wuhan 430074China chung-Ang University Seoul06974Republic of Korea COmSATS University Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan Fudan University Shanghai 200433China gSI Helmholtzcentre for Heavy Ion Research gmbH D-64291 DarmstadtGermany guangxi Normal University Guilin 541004China guangxi University Nanning 530004China Hangzhou Normal University Hangzhou 310036China Hebei University Baoding 071002China Helmholtz Institute mainz Staudinger Weg 18D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University Kaifeng 475004China Henan University of Science and Technology Luoyang 471003China Henan University of Technology Zhengzhou 450001China Huangshan College Huangshan 245000China Hunan Normal University Changsha 410081China Hunan University Changsha 410082China Indian Institute of Technology madras Chennai 600036India Indiana University BloomingtonIndiana 47405USA INFN Laboratori Nazionali di Frascati INFN Laboratori Nazionali di FrascatiI-00044FrascatiItaly INFN Laboratori Nazionali di Frascati INFN Sezione di PerugiaI-06100PerugiaItaly INFN Laboratori Nazionali di Frascati University of PerugiaI-06100PerugiaItaly INFN Sezione di Ferrara INFN Sezione di FerraraI-44122FerraraItaly INFN Sezione di Ferrara University of FerraraI-44122FerraraItaly Inner mongolia University Hohhot 010021China Institute of modern Physics Lanzhou 730000China Institute of Physics and Technology Peace Avenue 54BUlaanbaatar 13330Mongolia Instituto de A

Using e^(+)e^(−)annihilation data corresponding to an integrated luminosity of 2.93 fb^(−1)taken at the center-of-mass energy√s=3.773 geV with the BESIII detector,a joint amplitude analysis is performed on the decays D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η).The fit fractions of individual components are obtained,and large interferences among the dominant components of the decays D^(0)→a_(1)(1260)π,D^(0)→π(1300)π,D^(0)→ρ(770)ρ(770),and D^(0)→2(ππ)_(S)are observed in both *** the obtained amplitude model,the CP-even fractions of D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η)are determined to be(75.2±1.1_(stat).±1.5_(syst.))%and(68.9±1.5_(stat).±2.4_(syst.))%,*** branching fractions of D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η)are measured to be(0.688±0.010_(stat.)±0.010_(syst.))%and(0.951±0.025_(stat.)±0.021_(syst.))%,*** amplitude analysis provides an important model for the binning strategy in measuring the strong phase parameters of D^(0)→4πwhen used to determine the CKm angleγ(ϕ_(3))via the B^(−)→DK^(−)decay.

关键词： BESIII D^(0)meson decays amplitude analysis CP-even fraction

Predicting the optical observables for nucleon scattering on even-even actinides

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chinese Physics C 2017年第9期41卷 123-128页

作者： D. S. martyanov E. sh. Soukhovitskii R. Capote J. m. Quesada S. chiba Joint Institute for Energy and Nuclear Research 220109 Minsk-Sosny Belarus NAPC-Nuclear Data Section International Atomic Energy Agency Vienna A-1400 Austria Departamento de Fisica Atomica Molecular y Nuclear Universidad de Seviha Ap.1065 E-4i080 Sevilla Spain Research Laboratory for Nuclear Reactors Tokyo Institute of Technology 2-12-1-N1-90okuyama Meguro-ku Tokyo 152-8550 Japan

The previously derived Lane consistent dispersive coupled-channel optical model for nucleon scattering on 232Th and 23Su nuclei is extended to describe scattering on even-even actinides with Z=90-98. A soft-rotator- model （SRm） description of the low-lying nuclear structure is used, where the SRm Hamiltonian parameters are adjusted to the observed collective levels of the target nucleus. SRm nuclear wave functions （mixed in K quantum number） have been used to calculate the coupling matrix elements of the generalized optical model. The ＂effective＂ deformations that define inter-band couplings are derived from the SRm Hamiltonian parameters. Conservation of nuclear volume is enforced by introducing a dynamic monopolar term to the deformed potential, leading to additional couplings between rotational bands. The fitted static deformation parameters are in very good agreement with those derived by Wang and collaborators using the Weizs^cker-Skyrme global mass model （WS4）, allowing use of the latter to predict cross sections for nuclei without experimental data. A good description of the scarce ＂optical＇experimental database is achieved. SRm couplings and volume conservation allow a precise calculation of the compound-nucleus formation cross sections, which is significantly different from that calculated with rigid-rotor potentials coupling the ground-state rotational band. The derived parameters can be used to describe both neutron- and proton-induced reactions.

关键词： optical model soft-rotator model FRDm deformations WS4 deformations even-even actinides

Determination of Particle Sizes and Crystalline Phases on Colloidal Silicon Nanoparticle Suspensions

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Journal of materials Science & Technology 1999年第6期15卷 548-550页

作者： S.m. Scholz and H Hofmann(Powder Technology Laboratory, Department of materials Science, Swiss Federal Institiute of Technology Lausanne,ch-1015 Lausanne, Switzerland) Powder Technology Laboratory Department of Materials Science Swiss Federal Institiute of Technology Lausanne CH-1015 Lausanne Switzerland

Particle size and crystallinity of silicon nanoparticles were determined by analyzing the optical extinction spectra of colloidal suspensions. Experimental results from these colloids were anaiyzed using mie theory in connection with effective medium theory, in order to determine particle sizes and their internal structure with the simple technique of optical transmission spectroscopy. By modeling an effective refractive index for the particles, the crystalline volume fraction can be extracted from extinction spectra in addition to information about the size. The crystalline volume fraction determined in this way were used to calibrate the ratio of the Raman cross sections for nanocrystalline and amorphous silicon, which was found to be σc./σa = 0.66

关键词： Determination of Particle Sizes and Crystalline Phases on Colloidal Silicon Nanoparticle Suspensions

On a Novel Eccentricity-based Invariant of a graph

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Acta mathematica Sinica,English Series 2016年第12期32卷 1477-1493页

作者： Ke Xiang XU Kinkar ch.DAS Ayse Dilek mADEN College of Science Nanjing University of Aeronautics & Astronautics Department of mathematics Sungkyunkwan University Department of mathematics Faculty of ScienceSelcuk University

In this paper, for the purpose of measuring the non-self-centrality extent of non-self- centered graphs, a novel eccerttricity-based invariant, named as non-self-centrality number （NSC num- ber for short）, of a graph g is defined as follows： N（g） =∑vi,vj∈V（g）｜ei-ej｜ where the summation goes over all the unordered pairs of vertices in g and ei is the eccentricity of vertex vi in g, whereas the invariant will be called third Zagreb eccentricity index if the summation only goes over the adja- cent vertex pairs of graph g. In this paper, we determine the lower and upper bounds on N（g） and characterize the corresponding graphs at which the lower and upper bounds are attained. Finally we propose some attractive research topics for this new invariant of graphs.

关键词： Eccentricity non-self-centered graph non-self-centrality number third Zagreb eccentricity index diameter

Ac voltammetric and square wave voltammetric study of the self-assembled monolayers of thiol-functionalized viologen derivative

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chinese Journal of chemistry 1997年第2期15卷 130-137页

作者： Li, JH Yang, ch Yan, JC chen, WQ Dong, SJ chINESE ACAD SCI CHANGCHUN INST APPL CHEMELECTROANALYT CHEM LABCHANGCHUN 130022JILINPEOPLES R CHINA

Electroactive self-assembled monolayers (SAms) containing viologen group are formed through the adsorption of thiol-functionalized viologen compound ch3(ch2)(9)V2+(ch2)(8)sh, where V2+ is N,N'-dialkylbipyridinium (i.e. a viologen group), onto gold electrodes from methanol/water solution and its electrochemical behavior is investigated ty Ac voltammetry and square wave voltammetry, which have the high sensitivity against background charging. The viologen SAm formed is a sub-monolayer and the normal potentials corresponding to the two successive one-electron transfer processes of the active centers (viologen) are -360 mV and -750 mV (vs. Ag/AgCl) in 0.1 mol/L phosphate buffer solutions (pH 6.96) respectively, and the standard electron transfer rate constant is 9.0 s(-1). The electrochemical behavior of this SAm in various solutions has been preliminarily discussed.

关键词： self-assembled monolayers viologen Ac voltammetry square wave voltammetry

Electrical Relaxation in mixed Alkali Bi_2O_3-K_2O-Li_2O-Fe_2O_3 glasses

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Journal of materials Science & Technology 2006年第5期22卷 701-707页

作者： E.E.shaisha sh.F.El-Desouki I.shaltout A.A.Bahgat Department of physics Faculty of science Al-Azhar UniversityNasr CityCairo 11884Egypt

A new glass system （Bi2O3）50（Fe2O3）10（Li2O）x（K2O）40-x, where x changes in steps of 5 mole fraction between 0 and 40, was selected to study the electrical relaxation and the mixed alkali effect （mAE） phenomena. measurements of ac conductivity σac, dielectric permittivity ε′ and loss factor tanδ in the frequency range of 0.12～10^2 kHz and in the temperature range of 300～650 K were carried out. The temperature dependence of the ac conductivity shows a slow increasing rate at low temperature and high frequency and a rapid increase at high temperature and low frequency. At constant temperature, the ac conductivity is found to be proportional to ω^8, where s is the frequency exponent, which is less than 1. Analysis of the conductivity data and the frequency exponent shows that the overlapping large polaron tunnelling （OLPT） model of ions is the most favorable mechanism for the ac conduction in the present glass system. The ac response, the dc conductivity and dielectric relaxation have the same activation energy and they originate from the same basic transport mechanism. The results of the dielectric permittivity show no maximum peak in the temperature and frequency range studied. This absence of maximum peak is an indication of non-ferroelectric behavior of all the studied samples. The mAE has been detected in the ac conductivity, which is the same as the classical mAE in the dc conductivity. The electrical parameters such as dielectric permittivity ε′ and real dielectric modulus m′ show a typical minimum deviation from linearity by about two orders of magnitude. The loss factor tanδ and the imaginary dielectric modulus m″ are insignificantly dependent on composition even at the same transition temperature Tg.

关键词： Dielectric permittivity Dielectric modulus Loss factor Conduction mechanism mAE (mixed alkali effect)

Facile microwave-assisted fabrication of WC-Al_2O_3 composite powder from WO_3-Al-C mixture

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Transactions of Nonferrous metals Society of china 2017年第12期27卷 2630-2637页

作者： A. KARImZADEH BEHNAmI m. SAKAKI m. sh. BAFgHI K. YANAgISAWA School of metallurgy and materials Engineering Iran University of Science and TechnologyNarmak Tehran 16846-13114 Iran Department of materials Engineering Faculty of Engineering Malayer University Malayer 65719-95863 Iran Research Laboratory of Hydrothermal chemistry Kochi University Kochi 780-8520 Japan

A facile and cheap method for the fabrication of WC-Al2O3composite powder was *** calculations indicate that aluminothermic reduction of WO3in WO3:xAl:(4-1.5x)C mixture is accompanied by a great deal of heat,so carbothermic reduction reaction(endothermic)becomes activated in the *** substitution of aluminum with carbon,the formation of unwanted W2C phase can be prevented because of less thermodynamic stability at lower *** the verification of the proposed reaction mechanism,various WO3:xAl:(4-1.5x)C mixtures(1.1≤x≤2)were heat-treated in a domestic microwave *** results showed that the type of reaction is self-propagating high temperature synthesis(shS)when1.4≤x≤*** amount of Al in WO3:xAl:(4-1.5x)C mixtures results in a higher formation of WC.A W2C-free WC-Al2O3composite was obtained by continuation of microwave heating in an isolated atmosphere,after the occurrence of shS reaction in a mixture containing1.4mol of *** also showed that when x≤1.3,type of reaction becomes gradual,which in turn brings about the incompleteness reaction and residue of initial reagents.

关键词： microwave heating combustion synthesis WC-Al2O3 composite

SYNTHESIS,chARACTERIZATION AND ELECTRICAL PROPERTIES OF Nd/Zr CO-DOPED NANO BaTiO_(3) CERAmICS

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Journal of Advanced Dielectrics 2012年第1期2卷 34-47页

作者： ch.SAmEERA DEVI m.B.SUREsh g.S.KUmAR g.PRASAD Department of Physics Osmania University HyderabadAndhra Pradesh 500007India International Advance Research Centre for metallurgy and New materials BalapurHyderabad 500007India Department of Physics Osmania University HyderabadAndhra Pradesh500007India

Ceramic samples of composition Ba_(1-3)xNd_(2x)Ti_(1-y)ZryO_(3)(x=0.025;y=0.025 and 0.05)were synthesized by modified sol-gel *** confirmation,surface morphology and electrical properties of the samples were studied using XRD,FESEm,impedance spectroscopy and DC ***,AC and DC conductivities of the samples were recorded in the temperature range room temperature(RT)-500℃.From impedance data,various parameters like bulk resistance(R_(b)),bulk capacitance(C_(b)),grain resistance(R_(g)),grain boundary resistance(R_(gb)),grain capacitance(C_(g))and grain boundary capacitance(Cgb)T were *** parameters were found to be function of both temperature and *** and grain boundary relaxation times(τ_(g),τ_(gb))were also evaluated as a function of *** AC and DC conductivity plots activation energies for conduction were *** obtained lead to improved understanding of conductivity and charge transportation kinetics in the present system of samples.

关键词： Sol-gel method BaTiO_(3) impedance spectroscopy DC conductivity AC conductivity