天线设计工程微电子

Multipleimpactcharacterizationofwaferlevelpackaging(WLP)OriginalResearchArticleMicroelectronicsReliabilityProcessingandpropertiesofengineeringplasticsrecycledfromwasteelectricalandelectronicequipment(WEEE)OriginalResearchArticlePolymerDegradationandStabilityAnalyticalmodelsforshockisolationoftypicalcomponentsinportableelectronicsOriginalResearchArticleInternationalJournalofImpactEngineeringTheoreticalmodelscanhelptoguidethecushiondesignforportableelectronics.Inthetheoryofshockisolation,mass-springmodelhasbeenmostlyadoptedtodescribetheshockresponseofasystem.However,sincethemass-springmodelignoresthedeflectionofthefragileequipmentandthecouplingoftheequipmentwithitssupports,itmaynotbeadequatetoapplytoflexibleelectroniccomponentssuchasprintedcircuitboard.Inthepresentpaper,acomprehensivestudyiscarriedoutforbothmass-springsystemsandflexiblebeamstructures.Particularattentionispaidtothemaximumforcesustainedbytheconnecter,themaximumrelativedisplacementandthevibrationamplitudewithrespecttoshockduration.Itisfoundthataslongastheshockdurationexceeds0.3timesofthebasicperiod,thebeamstructurecanstillbesimplifiedasmass-springmodel.However,about10vibrationmodesshouldbeconsideredinordertoachieveagoodestimation,iftheshockdurationismuchshorterthanthenaturalperiod.Resultsshowthatbettercushioneffectcanbeachievedwhentheshockdurationexceeds2.5timesofthenaturalperiodoftheresponsesystem.Anotablephenomenonfoundinthisresearchisthatthemaximumstrainisindependentofthedimensionofthebeam.ArticleOutline1.Introduction2.Mass-springmodel2.1.Modeldescription2.2.Theeffectofdropvelocityandpeakacceleration2.3.Theeffectofisolationspring2.4.Theeffectofpulsedurationforfixedimpactvelocity3.Beammodel3.1.Simplysupportedbeam3.2.Clampedbeam4.Conclusions9articlesfoundfor:pub-date>2004andtak(((Morethan900mhz)or(antennadesign)orExperienceor(Practicalexperience)or(massproduction)orUHFor(microwaveantennadesign)or(simulationanddebugging)or(Thephysicalrealization)or(antennaproducts)or(Productapplications)or(thechipantennastructure)ordesignorverificationorimplementation)and(ADSorhssor(otherelectromagneticsimulationtools)or(protelSE)orDXPor(PowerPCB)or(graphicssoftware)or(abletoskillfullyuse)or(avarietyofmicrowave)or(testequipment)))ElectroniccomponentsandpackagingMeasurementsandpredictionsoftheairdistributionsystemsinhighcomputedensity(Internet)datacentersOriginalResearchArticleEnergyandBuildingsWhenequipmentpowerdensityincreases,acriticalgoalofadatacentercoolingsystemistoseparatetheequipmentexhaustairfromtheequipmentintakeairinordertopreventtheITserverfromoverheating.Coolingsystemsfordatacentersareprimarilydifferentiatedaccordingtothewaytheydistributeair.Thesixcombinationsoffloodedandlocallyductedairdistributionmakeupthevastmajorityofallinstallations,exceptfullyductedairdistributionmethods.Oncetheairdistributionsystem(ADS)isselected,thereareotherelementsthatmustbeintegratedintothesystemdesign.Inthisresearch,thedesignparametersandITenvironmentalaspectsofthecoolingsystemwerestudiedwithahighheatdensitydatacenter.CFDsimulationanalysiswascarriedoutinordertocomparetheheatremovalefficienciesofvariousairdistributionsystems.TheITenvironmentofanactualoperatingdatacenterismeasuredtovalidateamodelforpredictingtheeffectofdifferentairdistributionsystems.Amethodforplanninganddesignoftheappropriateairdistributionsystemisdescribed.ITprofessio...

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