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Critical Expon.n.s for the Re-en.ran. Phase Tran.ition. in.the Three-Dimen.ion.l Blume-Emery-Grifilths Model on.the Cellular Automaton

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Chin.se Physics Letters 2007年第7期24卷 2040-2043页

作者： n. Seferoglu B. Kutlu GaziUfn.versitesi Fen Bilimleri Enstitfisfi Fizik Anabilim Dah Ankara Turkey GaziUn.versitesi Fen-Edebiyat Fakiiltesi Fizik Boliumfi 06500 Teknikokullar Ankara Turkey

The critical behaviour of the three-dimen.ion.l Blume-Emery-Griffiths （BEG） model ＆ in.estigated at D/ J = O, -0.25 an. -1 in.the ran.e of-1 ≤ K/J ≤ 0 for J -- 100. The simulation. are carried out on.a simple cubic lattice usin. the heatin. algorithm improved from the Creutz cellular automaton.（CCA ） un.er periodic boun.ary con.ition.. The un.versality of the model are obtain.d for re-en.ran. an. double re-en.ran. phase tran.ition. which occur at certain.D/J an. K/J parameters, with J an. K represen.in. the n.arest-n.ighbour bilin.ar an. biquadratic in.eraction., an. D bein. the sin.le-ion.an.sotropy parameter. The values of static critical expon.n.s β, γ an. v are estimated within.the framework of the fin.te-size scalin. theory. The results are compatible with the un.versal Isin. critical behaviour for all con.in.ous phase tran.ition. in.these ran.es.

关键词： Three-Dimen.ion.l Blume-Emery-Griffiths BEG CCA

Creep Behaviour of Fe-Mn.Bin.ry Alloys

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Chin.se Physics Letters 2006年第11期23卷 3037-3040页

作者： O. Sahin. n. Ucar Departmen. of Physics Art and Science Faculty Suleyman Demirel University Isparta Turkey

Ten.ile creep behaviour of fin.-grain.d Fe-Mn.bin.ry alloys con.ain.n. 0.42-1.21 wt. % Mn.has been.in.estigated in.the temperature ran.e from room temperature to 475K un.er 10-50 MPa. Ten.ile tests are carried out with a con.tan. cross-head speed un.er un.axial load at a strain.rate 10^-4s^-1. Stress expon.n. an. activation.en.rgy are determin.d to clarify deformation.mechan.sm. The obtain.d variation.of steady state creep rate with respect to the applied stress for Fe-Mn.bin.ry alloys exhibits two distin.t regimes at about 20 MPa, in.icatin. a possible chan.e in.creep mechan.sm. The average stress expon.n. is approximately 2.2, which is a characteristic of grain.boun.ary slidin. in.the alloys. The activation.en.rgy for plastic flow varies from 135 to 92k J/mol, depen.in. on.the Mn.con.en..

关键词： HIGH-TEMPERATURE CREEP STEADY-STATE CREEP PB-SB ALLOYS TRAn.FORMATIOn STRESS

Effects of extern.l magn.tic trap on.two dark soliton. of a two-compon.n. Bose-Ein.tein.con.en.ate

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Chin.se Optics Letters 2008年第8期6卷 611-614页

作者：李宏 D. n. Wan. Departmen. of Physics Hubei NormaJ University Huangshi 435002 School of Mechan.cal an. Electron.c En.in.erin. Huangshi Institute of Technology Huangshi 435003 Departmen. of Electrical En.in.erin. The Hong Kong Polytechnic University Hong Kong

Two dark soliton. are con.idered in.a two-compon.n. Bose-Ein.tein.con.en.ate with an.extern.l magn.tic trap, an. effects of the trap poten.ial on.their dyn.mics are in.estigated by the n.merical simulation. The results show that the dark soliton. attract, collide an. repel periodically in.two compon.n.s as time chan.es, the time period depen.s strictly on.the in.tial con.ition.an. the poten.ial, an. there are obvious self-trappin. effects on.the two dark soliton..

关键词： Bose Ein.tein.con.en.ation. Computer simulation. Plasma con.in.men. Steam con.en.ers

An.lysis an. con.rol of win.-driven.self-excited in.uction.gen.rators con.ected to the grid through power con.erters

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Fron.iers in.En.rgy 2012年第4期6卷 403-412页

作者： S. Sen.hil KUMAt n. KUMARESAn.n. Ammasai GOUn.En.n.man. RAKESH Departmen. of Electrical an. Electron.cs En.in.erin. National Instituteof Technology Tiruchirappalli Tamil Nadu 620015 India

The an.lysis of the win.-driven.self-excited in.uction.gen.rators （SEIGs） con.ected to the grid through power con.erters has been.developed in.this paper. For this an.lysis, a method of represen.in. the grid power as equivalen. load resistan.e in.the steady-state equivalen. circuit of SEIG has been.formulated. The techn.que of gen.tic algorithm （GA） has been.adopted for makin. the an.lysis of the proposed system simple an. straightfor- ward. The con.rol of SEIG is attempted by con.ectin. an.un.on.rolled diode bridge rectifier （DBR） an. a lin. commutated in.erter （LCI） between.the gen.rator term- in.ls an. three-phase utility grid. A simple con.rol techn.que for maximum power poin. trackin. （MPPT） in.win. en.rgy con.ersion.systems （WECS）, in.which the firin. an.le of the LCI alon. n.eds to be con.rolled by sen.in. the rotor speed of the gen.rator has been.proposed. The effectiven.ss of the proposed method of MPPT an. method of an.lysis of this win.-driven.SEIG-con.erter system con.ected to the grid through power con.erters has been.demon.trated by experimen.s an. simulation. These experimen.al an. simulated results con.irm the usefuln.ss an. successful workin. of the proposed system an. its an.lysis.

关键词： self-excited in.uction.gen.rator (SEIG),ren.wable power gen.ration power con.erters maximumpower poin. trackin. (MPPT) steady state an.lysis powergen.ration.systems

Effect of boun.ary con.ition. an. con.ection.on.thermally in.uced motion.of beams subjected to in.ern.l heatin.

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Journ.l of Zhejian. Un.versity-Scien.e A(Applied Physics & En.in.erin.) 2007年第7期8卷 1044-1052页

作者： MALIK Pravin.KADOLI Ravikiran.GAn.SAn.n. Departmen. of Mechan.cal En.in.erin. National Institute of Technology Karnataka Surathkal Srinivasnagar 575025 India Departmen. of Mechan.cal En.in.erin. Indian Institute of Technology Madras Chennai 600036 India

n.merical exercises are presen.ed on.the thermally in.uced motion.of in.ern.lly heated beams un.er various heat tran.fer an. structural boun.ary con.ition.. The dyn.mic displacemen. an. dyn.mic thermal momen. of the beam are an.lyzed takin. in.o con.ideration.that the temperature gradien. is in.epen.en. as well as depen.en. on.the beam displacemen.. The effect of len.th to thickn.ss ratio of the beam on.the thermally in.uced vibration.is also in.estigated. The type of boun.ary con.ition. has its in.luen.e on.the magn.tude of dyn.mic displacemen. an. dyn.mic thermal momen.. A sustain.d thermally in.uced motion.is observed with progress of time when.the temperature gradien. bein. evaluated is depen.en. on.the forced con.ection.gen.rated due to beam motion. A fin.te elemen. method (FEM) is used to solve the structural equation.of motion.as well as the heat tran.fer equation.

关键词： Thermal in.uced oscillation. n.tural con.ection Forced con.ection Fin.te elemen. an.lysis

EBSD Characterization.of Microstructure an. Micro-texture in.a Friction.Stir-Welded DP600 Steel

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Acta Metallurgica Sin.ca(En.lish Letters) 2023年第5期36卷 789-802页

作者： H.ashrafi M.Shaman.an.M.San.yei F.Farhadi J.A.Szpun.r Faculty of Chemical an. Materials En.in.erin. Shahrood University of TechnologyShahrood***Iran Departmen. of Materials En.in.erin. Isfahan University of TechnologyIsfahan***Iran Departmen. of Mechan.cal En.in.erin. University of SaskatchewanSaskatoonSKS7N 5A9Canada Departmen. of Materials Scien.e an. En.in.erin. Worcester Polytechnic InstituteWorcesterMA01609USA

The microstructure an. micro-texture in.differen. areas of a friction.stir(FS)-welded DP600 steel were in.estigated by mean. of electron.backscatter *** volume fraction.of marten.ite an. n.n.polygon.l ferrite was evaluated based on.the image quality(IQ)*** of grain.boun.aries revealed that the fraction.of sub-grain.boun.aries as well as that of low-an.le grain.boun.aries in.the heat-affected zon.(HAZ)an. stir zon.(SZ)was more than.doubled compared to those in.the DP600 steel base metal(BM).The micro-texture examin.tion.of the BM showed stron.{112}an.{111}compon.n.s with an.in.en.ity 4.6 times of that ran.om *** texture showed a memory effect in.the HAZ,with a reduced overall *** the SZ,D_(1),D_(2) an. E shear texture compon.n.s together with a cube compon.n. were *** of these texture compon.n.s of ferrite were attributed to the tran.formation.of B an. R texture compon.n.s of prior austen.te,which are eviden.es of con.in.ous dyn.mic recrystallization.mechan.sm in.the SZ of the friction.stir-welded DP600 steel.

关键词： Dual phase steel Friction.stir weldin. Micro-texture Image quality

Weak Form of Fuzzy Open.Sets an. Their Related Con.in.ity

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模糊系统与数学 2010年第3期24卷 86-91页

作者： n. Gowrisan.ar n. Rajesh Departmen. of Mathematics Rajah Serfoji Govt. College Thanjavur- 613005 Tamilnadu India

The aim of this paper is to give a n.w class of fuzzy open.sets called fuzzy pre-γ-open.sets in.fuzzy topological spaces. Also,a n.w type of fuzzy con.in.ous fun.tion. called,fuzzy pre-γ-con.in.ous fun.tion. is in.r... 详细信息

关键词：模糊理论空间理论计算方法数学理论

Ultraviolet an. visible upcon.ersion.lumin.scen.e of Tm(0.1)Yb(5):FOV oxyfluoride n.n.phase vitroceramics

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Scien.e Chin.(Physics,Mechan.cs & Astron.my) 2008年第12期51卷 1868-1876页

作者： n. SAWAn.BOI M. OHTSUKA Sumita Optical Glass Inc. Japan

The ultraviolet upcon.ersion.lumin.scen.e of Tm3+ ion. sen.itized by Yb3+ ion. in.oxyfluoride n.n.phase vitroceramics when.excited by a 975 n. diode laser was studied. An.ultraviolet upcon.ersion.lumin.scen.e lin. position.d at 363.6 n. was foun.. It was attributed to the fluorescen.e tran.ition.of 1D2→3H6 of Tm3+ ion. Sev- eral visible upcon.ersion.lumin.scen.e lin.s at 450.7 n., (477.0 n., 462.5 n.), 648.5 n., (680.5 n., 699.5 n.) an. (777.2 n., 800.7 n.) were also foun., which result respectively from the fluorescen.e tran.ition. of 1D2→3F4, 1G4→3H6, 1G4→3F4, 3F3→3H6 an. 3H4→3H6 of Tm3+ ion. The careful measuremen. an. an.lysis of the variation.of upcon.ersion.lumin.scen.e in.en.ity F as a fun.tion.of the 975 n. pumpin. laser power P prove that the upcon.ersion.lumin.scen.e of 1D2 state is partly a five-photon.upcon.ersion.lumin.scen.e, an. the upcon.ersion.lumin.s- cen.e of 1G4 state an. 3H4 state are respectively the three-photon.an. two-photon.upcon.ersion.lumin.scen.e. The theoretical an.lysis suggested that the upcon. version.mechan.sm of the 363.6 n. 1D2→3H6 upcon.ersion.lumin.scen.e is partly the cross en.rgy tran.fer of {3H4(Tm3+)→3F4(Tm3+), 1G4(Tm3+)→1D2(Tm3+)} an. {1G4(Tm3+)→3F4(Tm3+), 3H4(Tm3+)→1D2(Tm3+)} between.Tm3+ ion.. In.addition. the upcon.ersion.lumin.scen.e of 1G4 an. 3H4 state results respectively from the se- quen.ial en.rgy tran.fer {2F5/2(Yb3+)→2F7/2(Yb3+), 3H4(Tm3+)→1G4(Tm3+)} an. {2F5/2(Yb3+) →2F7/2(Yb3+), 3F4(Tm3+)→3F2(Tm3+)} from Yb3+ ion. to Tm3+ ion..

关键词： upcon.ersion lumin.scen.e ultraviolet oxyfluoride n.n.phase vitroceramics saturation Tm3+ ion Yb3+ ion en.rgy tran.fer

Gradewise Properties of Subgroups an. Their Application.

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Algebra Colloquium 2017年第2期24卷 255-266页

作者： Wen.in.Guo Alexan.er n. Skiba Departmen. of Mathematics University of Science and Technology of China Hefei 230026 China Departmen. of Mathematics Francisk Skorina Gomel State University Gomel 246019 Belarus

For each fin.te group E, let O（E） be a bin.ry relation.on.the set of all subgroups of E. If A an. B are subgroups of a fin.te group G, then.we say that the pair （A, B） en.oys the gradewise property （resp., gen.ralized gradewise property） in.G if G has a n.rmal series Г：1=G0≤G1≤Gt=Gsuch that for each i=1,...,t,we have （（A∩Gi）Gi-1/BGi-1/Gi-1）∈θ（G/Gi-1）（resp., we have （（A∩Gi）Gi-1/BGi-1/Gi-1）∈θ（G/Gi-1）Usin. these con.epts, we obtain.some n.w characterization. for solubility an. supersolubility of fin.te groups an. gen.ralize some kn.wn.results.

关键词： fin.te group subgroup fun.tor subgroup bifun.tor gradewise property