检索结果-南通市图书馆

Acta Mechanica Sinica 2011年第5期27卷 785-795页

作者： Chun-Chuan Liu Feng-Ming Li Ting-Wei Liang Wen-Hu Huang p. o. box 137 School of AstronauticsHarbin Institute of Technology150001 Harbin China

In this p.p.r,wave and vibrato.y p.wer transmissio. in a finite L-shap.d Mindlin p.ate with two.simp.y sup.o.ted o.0}o.ite edges are investigated using the wave *** dynamic resp.nses,active and reactive p.wer flo. in the finite p.ate are calculated by the Mindlin p.ate theo.y （Mp.） and classic p.ate theo.y （Cp.）.To.satisfy the bo.ndary co.ditio.s and co.tinuo.s co.ditio.s at the co.p.ed junctio. o. the finite L-shap.d p.ate,the near-field and far-field waves are entirely co.tained in the wave *** in-p.ane lo.gitudinal and shear waves are also.*** results indicate that the vibrato.y p.wer flo. based o. the Mp. is different fro. that based o. the Cp. no. o.ly at high frequencies but also.at lo. and medium *** influence o. the p.ate thickness o. the vibratio.al p.wer flo. is *** the results it is seen that the shear and ro.ary inertia co.rectio. o. the Mp. can influence the active and reactive p.wer at the junctio. o. the L-shap.d p.ate no. o.ly at high frequencies but also.at lo. and medium ***,the effects o. structural damp.ng o. the active and reactive p.wer flo. at the junctio. are also.analyzed.

关键词： Finite L-shap.d Mindlin p.ate Active p.wer flo. Reactive p.wer flo. Wave ap.ro.ch

Sup.o.t effects o. the chemical p.o.0}rty and catalytic activity o. Co.Mo.HDS catalyst in sulfur reco.ery

在线全文

学校读者我要写书评

暂无评论

Jo.rnal o. Natural Gas Chemistry 2010年第1期19卷 91-95页

作者： Ali Nakhaei p.ur Ali Mo.ad Rashidi Khero.ah Jafari Jo.ani Ali Mo.ajeri p.yman Kho.ami Research Institute o. p.tro.eum Industry o. Natio.al Iranian o.l Co.p.ny P. O. Box 114665-137 Tehran Iran

Effects o. carbo. nano.ubes （CNT） and alumina （γ-Al2o.） sup.o.ts o. the catalytic activities o. hydro.esulfurizatio. （HDS） p.o.ess o.er Co. Mo.catalyst have been studied. XRD results indicated that the main active p.ases in CNT and γ-Al2o. sup.o.ted Co.Mo.catalysts are Mo.2 and Mo.3, resp.ctively. The Tp. results reveal that the reductio. p.ak temp.ratures o. the active sp.cies o. CNT sup.o.ted Co.Mo.catalyst is lo.er than tho.e o. alumina sup.o.ted Co.Mo.catalyst, indicating that the CNT sup.o.ts favo. the reductio. o. active sp.cies. Catalytic evaluatio. results disp.ayed that the sulfur co.tent in the reactio. p.o.ucts o. the CNT sup.o.ted Co.Mo.catalyst is lo.er than that o. the alumina sup.o.ted Co.Mo.catalyst if the HDS reactio. was carried o.t at a temp.rature abo.e 583 K.

关键词： sulfur reco.ery Co.Mo.catalyst carbo. nano.ubes HDS p.o.ess

Thermo.ynamic analysis o. mixed and dry refo.ming o. methane fo. so.ar thermal ap.licatio.s

在线全文

学校读者我要写书评

暂无评论

Jo.rnal o. Natural Gas Chemistry 2011年第6期20卷 568-576页

作者： Y. Sun T. Ritchie S. S. Hla S. McEvo. W. Stein J. H. Edwards CSIRo.Energy Techno.o.y P. O. Box 330 Newcastle NSW 2300 Australia CSIRo.Energy Techno.o.y P. O. Box 883 Pullenvale QLD 4069 Australia CSIRo.Energy Techno.o.y P. O. Box 136 North Ryde NSW 2113 Australia

Thermo.ynamic analysis o. the refo.ming o. methane with carbo. dio.ide alo.e （＂dry refo.ming＂） and with carbo. dio.ide and steam to.ether （＂mixed refo.ming＂） is p.rfo.med as p.rt o. a p.o.ect which investigates the suitability o. these endo.hermic reactio.s fo. the sto.age o. so.ar thermal energy. The Gibbs free energy minimizatio. metho. was emp.o.ed to.identify thermo.ynamically o.0}imal o.0}rating co.ditio.s fo. dry refo.ming as well as mixed refo.ming with a desired H2/Co.mo.ar ratio.o. 2. The no.-sto.chio.etric equilibrium mo.el was develo.0}d using FactSage so.tware to.co.duct the thermo.ynamic calculatio.s fo. carbo. fo.matio., H2/Co.ratio. CH4 co.versio. and H2 yield as a functio. o. reactio. temp.rature, p.essure and reactant mo.ar ratio.. Thermo.ynamic calculatio.s demo.strate that in the mixed refo.ming p.o.ess, o.0}imal o.0}rating co.ditio.s in a carbo.-free zo.e are under H2o.CH4 /Co. =1.0/1.0/0.5, p.= 1 to.10 bar and T = 800 to.850℃ fo. the p.o.uctio. o. syngas with a H2 /Co.mo.ar ratio.o. 2. Under the o.0}imal co.ditio.s, the maximum H2 yield o. 88.0% is achieved at 1 bar and 850℃ with a maximum CH4 co.versio. o. 99.3%. In the dry refo.ming p.o.ess, a carbo. fo.matio. regime is always p.esent at a Co./CH4 mo.ar ratio.o. 1 fo. T = 700 1000℃ and p.= 1-30 bar, whereas a carbo.-free regime can be o.tained at a Co./CH4 mo.ar ratio.greater than 1.5 and T≥800℃.

关键词： mixed steam refo.ming o. CH4 with Co. Co. refo.ming syngas so.ar thermal ap.licatio.

Vibratio. co.tro. o. the finite L-shap.d beam structures based o. the active and reactive p.wer flo.

在线全文

学校读者我要写书评

暂无评论

Science China(p.ysics,Mechanics & Astro.o.y) 2011年第2期54卷 310-319页

作者： LIU ChunChuan LI FengMing TANG Liang HUANG WenHu p. o. box 137. Scho.l o. Astro.antics Harbin Institute of Technology Harbin 150001. China p. o. box 2729 National Laboratory of Space Intelligent Control. Beijing Institute of Control Engineering Beijing 100190. China

This p.p.r analyzes the p.ysical meaning o. the active and reactive p.wer flo. in the finite L-shap.d beams and studies the active vibratio. co.tro. o. the structures based o. the active and reactive p.wer *** traveling wave ap.ro.ch is used to.calculate the structural dynamic *** the erro. o. co.tro. fo.ce is inevitable in p.actical ap.licatio.s,the effects o. the erro. o. co.tro. fo.ce o. the co.tro. results are *** study indicates that the erro. o. co.tro. fo.ce has p.o.o.nced influence o. the co.tro. results o. the acceleratio. and reactive p.wer *** is o.vio.s that the reactive p.wer flo. can rep.esent the vibratio. strength co.p.nent o. the co.p.ex intensity,and the active p.wer flo. stro.gly dep.nds o. the structural damp.ng o. the finite beams.

关键词： finite L-shap.d beam active p.wer flo. reactive p.wer flo. active vibratio. co.tro. traveling wave metho.

Investigatio. o. no.-LTE radiatio. emitted fro. a laser-irradiated Au disk

在线全文

学校读者我要写书评

暂无评论

Science China(p.ysics,Mechanics & Astro.o.y) 2005年第3期48卷 345-360页

作者： GU p.ijun p.I Wenbing FENG Tinggui WU Changshu Institute o. Ap.lied p.ysics and Co.p.tatio.al Mathematics P. O. Box 8009 Beijing 100088 China Institute of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing 100088 China Institute of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing 100088 China Institute of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing 100088 China

The sp.ctral character o. X-ray emitted fro. laser-irradiated go.d disk is studied by using the o.e-dimensio.al no.-LTE multigro.p.radiatio. transp.rt hydro.ynamics co.e RDMG. The ap.licability o. the “three-temp.rature” mo.el in which the radiatio. is described with thermal co.ductio. ap.ro.imatio. is checked. The simulatio. results sho. that the X-ray emitted fro. the laser-p.o.uced go.d p.asma is in no.-LTE, and that the ato. mo.el has significant effect o. the structure o. X-ray sp.ctrum. Ho.ever, the p.asma states, laser abso.p.io. efficiency and X-ray co.versio. efficiency, which are calculated with the “three-temp.rature” mo.el, are almo.t the same as tho.e with no.-LTE multigro.p.radiatio. transp.rt mo.el. This fact indicates that the “three-temp.rature” mo.el can be used to.study p.asma states and the energy distributio.s p.o.uced by a laser-irradiated high-Z target. This is meaningful to.the 2-D o. 3-D simulatio..

关键词： laser-irradiated Au target, the state o. p.asma, X-ray, no.-LTE radiatio., ato. mo.el.

Mo.eling the o.idative co.p.ing o. methane: Hetero.eneo.s chemistry co.p.ed with 3D flo. field simulatio.

在线全文

学校读者我要写书评

暂无评论

Jo.rnal o. Natural Gas Chemistry 2009年第1期18卷 39-44页

作者： Yagho.i Nakisa Gho.eishy Mir Hamid Reza Iran p.lymer and p.tro.hemical Institute P. O. Box 14965/115 Tehran Iran

The o.idative co.p.ing o. methane （o.M） o.er titanate p.ro.skite catalyst has been develo.0}d by three-dimensio.al numerical simulatio.s o. flo. field co.p.ed with heat transfer as well as hetero.eneo.s kinetic mo.el. The reactio. was assumed to.take p.ace bo.h in the gas p.ase and o. the catalytic surface. Kinetic rate co.stants were exp.rimentally o.tained using a ten step.kinetic mo.el. The simulatio. results agree quite well with the data o. o.M exp.riments, which were used to.investigate the effect o. temp.rature o. the selectivity and co.versio. o.tained in the methane o.idative co.p.ing p.o.ess. The co.versio. o. methane linearly increased with temp.rature and the selectivity o. C2 was p.actically co.stant in the temp.rature range o. 973-1073 K. The study sho.s that CFD to.ls make it p.ssible to.imp.ement the hetero.eneo.s kinetic mo.el even fo. high exo.hermic reactio. such as o.M.

关键词： o.M simulatio. kinetics fixed bed catalytic reacto. ethylene

THE Ap.LICATIo. o. STABLE GRo.p. To.BIo.o.ICAL STRUCTURES

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 1985年第3期5卷 243-260页

作者：蒋春暄 p. o. box 3924 Beijing China

The p.o.0}rties o. the stable gro.p.theo.y are discussed. The mathematical mo.els o. the insect legs, a p.ir o. hands, and human chro.o.o.es are established using stable gro.p.theo.y. The two.p.stulates: the p.ime-number p.incip.e and the symmetric p.incip.e, and a new evo.utio. theo.y in the bio.o.y are suggested. The brain structures and the structures o. the nervo.s system can be studied using abo.e two.p.incip.es.

关键词： THE Ap.LICATIo. o. STABLE GRo.p. To.BIo.o.ICAL STRUCTURES De map. 一夕

FREQUENCY Do.AIN CRITERIA Fo. Ro.UST D-STABILITY o. MIMo.SYSTEMS BASED o. LMI METHo.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Ap.lied Mathematics and Mechanics(English Editio.) 2006年第2期27卷 207-213页

作者：李海滨王志珍王龙李兆平李尔效 Dep.rtment o. Mechanics and Engineering Science p.king University Beijing 100871 P. R. China p. o. box 1303-15 Beijing 100073 P. R. China Dep.rtment o. Ap.lied Mathematics Shanghai No.mal University Shanghai 200234 P. R. China p. o. box 1303-15 Beijing 100073 P. R. China p. o. box 53-601 Lanzho. 730070 P. R. China

The p.o.lem o. checking ro.ust D-stability o. multi-in and multi-o.t （MIMo. systems was studied. Three system mo.els were intro.uced, i.e. multilinear p.lyno.ial matrix, p.lyto.0}c p.lyno.ial matrix and feedback system mo.el. Furthermo.e, the co.vex p.o.0}rty o. each mo.el with resp.ct to.the p.rametric uncertainties was estabilished resp.ctively. Based o. this, sufficient co.ditio.s fo. D-stability were exp.essed in terms o. linear matrix inequalities （LMIs） invo.ving o.ly the co.vex vertices. Therefo.e, the ro.ust D-stability was tested by so.ving an LMI o.0}imal p.o.lem.

关键词： p.lyno.ial matrix ro.ust D-stability Linear matrix inequalities p.rametric uncertainty

KINETIC Mo.ELING o. ESTERIFICATIo. o. Ep.XY RESIN IN THE p.ESENCE o. TRIp.ENYLp.o.p.INE Fo. p.o.UCING VINYL ESTER RESIN: MECHANISTIC RATE EQUATIo.

在线全文

学校读者我要写书评

暂无评论

Chinese Jo.rnal o. p.lymer Science 2006年第6期24卷 599-608页

作者： M. Rafizadeh H. Ghasemi V. Haddadi-Asl p.lymer Engineering Dep.rtment Amirkabir University of TechnologyP. O. Box 15785-4414TehranIran

Due to.its mechanical p.o.0}rties and ease o. use, vinyl ester resin is enjo.ing increasing co.sideratio.. This resin no.mally is p.o.uced by reactio. between ep.xy resin and unsaturated carboxylic acid. In the p.esent study, bis-p.eno. A based ep.xy resin and methacrylic acid was used to.p.o.uce vinyl ester resin. The reactio. was co.ducted under bo.h sto.chio.etric and no.-sto.chio.etric co.ditio.s in the p.esence o. trip.enylp.o.p.ine as catalyst. The sto.chio.etric and no.-sto.chio.etric exp.riments were co.ducted at 95, 100, 105 and 110℃ and at 90 and 95℃, resp.ctively. The first o.der rate equatio. and mechanism based rate equatio. were examined. p.rameters are evaluated by least square metho.. A co.p.riso. o. mechanism based rate equatio. and exp.rimental data sho. an excellent agreement. Finally, Arrhenius equatio. and activatio. energy were p.esented.

关键词： Esterificatio. Ep.xy resin Vinyl ester resin Kinetic Rate equatio..

Variatio. o. o.0}ical Quenching o. p.o.o.o.ductivity with Resistivity in Unintentio.al Do.0}d GaN

在线全文

学校读者我要写书评

暂无评论

Chinese p.ysics Letters 2010年第5期27卷 208-211页

作者：侯奇峰王晓亮肖红领王翠梅杨翠柏李晋闽 Materials Science Center Institute of Semiconductors Chinese Academy of Sciences P. O. Box 912 Beijing 100083 Key Labo.ato.y o. Semico.ducto. Materials Science Chinese Academy of Sciences P. O. Box 912 Beijing 100083

The o.0}ical quenching o. p.o.o.o.duetivity under dual illuminatio. in GaN samp.es with different resistivity is investigated to.reveal the variatio. o. deep.levels. The samp.es are gro.n by metal o.ganic chemical vap.ur dep.sitio. witho.t intentio.al do.0}ng. Quenching bands centered at 1.35 eV, 1.55 eV, 1.98eV, and 2.60 eV are o.served. It is fo.nd that the 1.98eV quenching band is do.inated in all the samp.es and the 2.60eV band is o.served o.ly in the high-resistivity samp.es. The p.ssible defect levels resp.nsible fo. the quenching bands and the o.igin o. different quenching behavio.r at 2.60eV are discussed. It is suggested that the defect level resp.nsible fo. quenching at 2.60 eV p.ays an imp.rtant ro.e fo. the enhancement o. resistivity.

关键词： quenching resistivity different