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Muth-Mills Model of Urban Spatial Structure:Theory and Implications for Cities in China

1.IntroductionIn the United States a strong sentiment against a phenomenonknown as urban sprawl has developed and many local gov-ernments have adopted policies designed to deal with sprawl(Brueckner,2000).With the growing spatial sizes of cities(DING,2009)urban sprawl is now even found in Chinese cit-ies and it is characterized by scattered and poorly planned low-density developments beyond the edge of urbanized area...  (本文共8页) 阅读全文>>

《International Journal of Plant Engineering and Management》2002年03期
International Journal of Plant Engineering and Management

Application of Ferrography to Fault Diagnosis of Hydraulic Systems

1 IntroductionOilanalysishasbeenappliedformanydecadesasapreventivemaintenanceconceptutilizedtopre dictimpendingmechanicalfailurethroughexaminationofusedoilsamples.Theoilanalysiscon ceptisbasedonthepremisethatallmechanicalsystemsexperiencetheprocessofwearduringop eration .Thiswearprocessresultsintheproductionofweardebrisorwearparticleswhicharein dicativeoftherespectivewearsurfacecondition .Inthecaseoflubricatedsystems...  (本文共4页) 阅读全文>>

《Journal of China University of Mining & Technology》2002年02期
Journal of China University of Mining & Technology

Calculation Method for Media in Ball Mills by Layers

biggertheradiusris,thehigherthereverserateΨis,andsoisγ .Fig .2 DeflectionofmediainmillDuringtheendofthefirstphase ,medialocateatA point (Fig .3 ) .Bytheactionoftheinertia,mediacontinuetoglideupwards,deflectionanglecontinuestoenlarge .Thisbelongtothesecondphase .Additionaldeflectionangleτandangularve locityωBcanbecalculatedbymathematicalmethod .Thetotaldeflectionangleβisthesumofdeflectionangleγandglidingdeflectionangl...  (本文共5页) 阅读全文>>

《IMP & HIRFL Annual Report》2000年00期
IMP & HIRFL Annual Report

Decompositing Yang-Mills Field

Ittookdecadesuntilphysicistsunderstoodthatallknownfundamentalinteractionscanbedescribedintermsofgaugetheories,i.e.,Yang-Millsgaugetheory.Forfundamentalparticlescase,inthehighenergylimittheYang-Millsfieldisasymptoticallyfreeandcanbesolvedperturbatively.ButatlowenergiestheYang-Millsfieldbecomesstronglycoupled.Perturbativetechniquesfailandnonperturbativemethodsmustbedeveloped.Recently,confinementofcolordegreesoffreedomi...  (本文共1页) 阅读全文>>

《Journal of University of Science and Technology Beijing(English Edition)》1999年04期
Journal of University of Science and Technology Beijing(English Edition)

Force Parameter Model of 3-Roll Mills for Continuous Cold Rolling Wires

Fromthetimewhen3-rollmillsareinvelltedtotheendof1970's,theyhadbeenusedinhotrollingofwirerods,especiallyinproducingofnon-ferrousmetals.Itisestimatedthatapproximately90%ofthewirerodsmadefromaluminumandaluminumalloyswereproducedonthe3-rollmillsatthattime[l].In1980's,manyplantsbegantousethetechnologytosubstitllteforcolddrawingin'productionofwirerods[2],andnowthemillshavebeenwidelyappliedtocoldrollingofsteelwiresasitshigh...  (本文共4页) 阅读全文>>

《Nuclear Science and Techniques》1970年30期
Nuclear Science and Techniques

Regular behaviors in SU(2) Yang-Mills classical mechanics

RegularbehaviorsinSU(2)YangMilsclasicalmechanicsXuXiaoMing(ShanghaiInstituteofNuclearResearch,theChineseAcademyofSciences,Shanghai201800)ThisworkwassupportedinpartbytheEducationCommiteeofChina,inpartbytheEducationBureauofCASandinpartbytheGrantLWTZ1298oftheChineseAcademyofSciences(CAS)Manuscriptreceiveddate:19970308AbstractInordertostudyregularbehaviorsinhighenergynucleonnucleoncolisions,arepresentationofthev...  (本文共5页) 阅读全文>>