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简介：CentralBusinessDistrict(CBD),aconceptthatwasfirstproposedbyU.S.scholarsinthe1920s,referstoabusinesscenterthatfunctionsasacommercialtrading,finan-cialinformation,culturalcenter,exhibitionandofficeareaallrolledintoone:aplacethatisthecenterofbusiness,thedrivingpowerofurbaneconomicdevelopmentandthesoulofacity.

简介：Intenseclashesofinterestsandcollusionofideassprangupincessantlyamongnationsoverupwardsovereigntytransfer,interestsdistributionandmaintenanceofparityamongpartnersinthecourseofeconomicintegration.Disparitiesinsize,territory,nationalstrengthanddevelopmentlevelconceivablyoftenledtotensionsandevencrisesoverpowerdistribution.SoEUhistorycanbedescribedasoneofcrisesorcrisissettlementthroughreachinganewequilibrium,asignificantprocessforsustainedEUstability.

简介：1.AllpowersupplyunitsundertheStatePowerCorporationshallpublicizepowertariffstandardsandserviceprocedures.2.AllpowersupplyunitsoncountyorhigherlevelundertheStatePowerCorporationshallopentoservice7daysaweek.3.Powersupplysecurity,reliabilityandservicequality

简介：One-dimensionalringpowersystemisdiscreditedtoanumberofnodeseachcontainingageneratorwithinternalreactanceandloadbranchofresistanceandreactancewithacertainpowerfactor.Whenadisturbanceoccursatanymachineinthepowersystem,simulativeanalysisisperformedtoverifyhowthevariationofloadpowerfactoraffectingthebehaviorofelectromechanicalwavepropagationbyusingtheMATLABpackage,fromwhichdifferentsituationsarepresentedanddiscussed.Theseresultsshowthetypeofloadhasnoeffectonthebehaviorofelectromechanicalwavepropagation.

简介：Heathandlinghasbeenasignificantproblemofthehighpowerfiberlasersystemsastheoutputpowerincreasesrapidly.Claddingpowerstripper(CPS)whichisusedtodealwiththeunwantedopticalpowerandlightisrequiredforhighercoolingability.Sothemethodsofstrippingtheunwantedlightattractedmuchattentionrecently,andthethermaleffectisgiven.However,fewinvestigationsfocusonthedissipationoftheheatconvertedfromtheunwantedlight.Inthispaper,anapproachofactivecoolingforCPSisdemonstrated.ThisisachievedbyusingmicrochannelcoolingtechnologyinheatsinkinginCPStoimprovetheefficiencyofheatexchange.InordertoexplainthemechanismofCPSthefunctionofitandconsistenceofcategoriesoftheunwantedlightaredetailedfirstly.Thenmicrochannelheatsinkingisproposedandverifiedbytheheatexchangetheory.Atlast,thedesignoftheCPSwithmicrochannelheatsinkingisshownandfollowingexperimentisconducted.Thefinaltemperatureofthedevicewith1000WcladdingpowerwasdemonstratedatlasttoverifytheabilityofheatdistributionoftheCPScomponent.ThissuggeststhattheseCPSscanbeusedtostripeathousandofwattsoflightinhighpowerdoublecladdingfiberlasers.

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简介：本刊1987年第6期刊出中一和赵建林的《关于sumfromj=0tonj~kC_n~j=?的猜想》一文(以下简称“猜想”)后,陆续收到不少读者来信、来稿,给出了“猜想”的证明,现综述如下.为叙述方便,我们记

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简介：Anintelligentcoordinatedcontrolstrategyhasbeenproposedandsuccessfullyappliedtoa300MWboiler-tur-bineuniti.e.Unit1ofYuanbaoshanpowerplantinChina.Loadfollowingoperationofcoal-firedboiler-turbineunitinthepowerplantleadstochangesinoperatingpointswhichresultinnonlinearvariationsoftheplantvariablesandparameters.Forthevariationofoperatingconditionandslowlyvaryingdynamics,anintelligentcontrolschemehasbeendevelopedbycombiningfuzzyself-tuningwithadaptivecontrolandauto-tuningtechniques.Asthereexiststrongcouplingsbetweencontrolloopsofmainsteampressureandpoweroutputintheunit,anewdesignforstaticdecoupleraimedatdecouplingforsetpointsandunmeasuredpulverizedcoaldisturbanceofthesystematthesametimeispresented.Satisfactoryindustrialapplicationresultsshowthatsuchacontrolsystemhasenhancedadaptabilityandrobustnesstothecomplexprocess,andbettercontrolperformanceandhigheconomicbenefithavebeenobtained.

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简介：Twomethodsforimprovingtheequidrivingpower-frequencycharacteristicsofbroad-bandhighpowerklystronsarepresented.Oneisthatacomb-linebandpassfilterwithsomeattenuationpropertiesisinsertedbetweentheTWTdriverandtheklystronforcompensatingthegain-frequencycharacteristicsoftheklystrontogettherequiredequidrivingpower-frequencycharacteristics.Theotheristhatareactiveelementisconnectedwiththeinputcavitytochangeitsresonancefrequenciesf0andQL,andthustoimprovethepower-frequencycharacteristicsoftheklystron.

简介：简介：Barcode4J是一个用Java编写的条形码生成器。通过ApacheLicensev2.0发布，因此它很容易应用于商业环境中。可以生成所有常见的1-D和2-D的条形码，其中包括DataMatrix和PDF417，并且能以多种形式输出，比如SVG、EPS、bitmaps和Java2D——而且你可以很容易地添加自定义输出格式。同时，Barcode4J还为不同的应用程序提供了插件，其中最重要的就是ApacheFOP（格式化对象处理器）。有些用户也将Barcode4J部署为一个Servlet。

简介：持续了许久的“J罗离队”传闻，总算在一波未平一波又起的转会市场上，画上句号了。他的选择和决定，看似有点出乎意料，却也在情理之中，不是传闻里财大气粗的曼联，称霸亚平宁的尤文图斯，也不是急需重建的巴黎圣日耳曼，而是半路杀出的“绿茵好莱坞”拜仁慕尼黑。

简介：地球上最后一个人独自坐在房间里,这时,忽然响起了敲门声。“咚咚咚,咚咚咚……”急促的敲门声划破了黑沉沉的夜空,已经没有人的世界一下子笼罩在恐怖之中。屋里坐着的不是别人,正是大名鼎鼎的K博士、联合国科学委员会的首席科学家,他正在为人类的复生计划大伤脑筋呢。听到敲门声,博士不由得害怕起来:“谁在外面?找我干什么?……”一连串疑问像一条蟒蛇把他缠得很紧很紧。

简介：设计论谈：目前，中国社会和中国建筑设计领域对外国建筑师在中国的实践项目和成功案例展开了热烈的讨论。荧于这方面的讨论，您作为外国建筑师有何耳闻，如果有，您有何看法？

简介：给出了J-规范矩阵的定义，讨论了J-规范矩阵的一些基本性质和若干判定条件．

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简介：WehavecomprehensivelyinvestigatedthefrustratedJ1-J2-J3Heisenbergmodelonasimplecubiclattice.Thismodelallowsthreeregimesofmagneticorder,viz.,(π;π;π),(0;π;π)and(0;0;π),denotedasAF1,AF2,andAF3,respectively.Theeffectsoftheinterplayofneighboringcouplingsonthemodelarestudiedintheentiretemperaturerange.Thezerotemperaturemagneticpropertiesofthismodelarediscussedutilizingthelinearspinwave(LSW)theory,nonlinearspinwave(NLSW)theory,andGreen’sfunction(GF)method.ThezerotemperaturephasediagramsevaluatedbytheLSWandNLSWmethodsareillustrated,andareobservedtoexhibitdifferentparameterboundaries.Incertainregionsandalongtheparameterboundaries,thepossiblephasetransformationsdrivenbytheparametersarediscussed.TheresultsobtainedusingtheLSW,NLSW,andGFmethodsarecomparedwiththoseobtainedusingtheseriesexpansion(SE)method,andareobservedtobeingoodagreementwhenthevalueofJ2isnotclosetotheparameterboundaries.ThegroundstateenergiesobtainedusingtheLSWandNLSWmethodsareclosetothatobtainedusingtheSEmethod.Atfinitetemperatures,onlytheGFmethodisemployedtoevaluatethemagneticproperties,andthecalculatedphasediagramisobservedtobeidenticaltotheclassicalphasediagram.Theresultsindicatethatattheparameterboundaries,atemperature-drivenfirst-orderphasetransitionbetweenAF1andAF2mayoccuralongtheboundaryline.AlongtheAF1-AF3andAF2-AF3boundarylines,AF3islessstablethanAF1andAF2.OurcalculatedcriticaltemperatureagreeswiththatobtainedusingMonteCarlosimulationsandpseudofermionfunctionalrenormalizationgroupscheme.