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500 个结果
  • 简介:PackagingofMEMS(micro-electro-mechanicalsystem)devicesposesmorechallengesthanconventionalICpackaging,sincetheperformanceoftheMEMSdevicesishighlydependentonpackagingprocesses.ALandGridArray(LGA)packageisintroducedforMEMStechnologybasedlinearmulti-axisaccelerometers.FiniteelementmodelingisconductedtosimulatethewarpagebehavioroftheLGApackages.Amethodtocorrelatethepackagewarpagetomatrixblockwarpagehasbeendeveloped.Warpageforbothpackageandsensorsubstrateareobtained.Warpagepredictedbysimulationcorrelatesverywellwithexperimentalmeasurements.Basedonthisvalidatedmethod,detaileddesignanalysiswithdifferentpackagegeometricalvariationsarecarriedouttooptimizethepackagedesign.Withtheoptimizedpackagestructure,thepackagingeffectonaccelerometersignalperformanceiswellcontrolled.

  • 标签: 热变形分析 MEMS封装 加速计 微电子技术
  • 简介:这份报纸报导为分层的alpha锆磷酸盐(伪-ZrP)的准备的一条新线路支持了metalloporphyrinMnTMPyP。MnTMPyP用伪-ZrP路BA被设置进伪-ZrP(即预先设置的bultylamine被一个单层模式在伪-ZrP安排)作为开始的材料。为homovanillic酸(HVA)的支持的材料的催化活动氧化被调查。结果在催化系统显示出有希望的分层的支持材料的催化剂。

  • 标签: MnTMPyP 层状α-ZrP 催化反应 材料夹层
  • 简介:Thewirelessapplicationprotocol(WAP)protocolisnowtheleadingstandardforinformationservicesonwirelessterminalslikedigitalmobilephones.BytheuseofWAP,wirelessdevices,likemobilephones,arepossiblyinfectedwithvirusandworms.Thoughuptonowthereisnosuchattack,astheusageofscriptlanguagesincreases,thereisachanceofmaliciouscodeinjection.ThispaperdiscussesthethreatswithcurrentWAPprotocol,andhowchangesintheprotocolandtheincreaseinitsusagewillenableentryofrealviruses.Futurethreatscenariosarepresentedalongwithsuggestionstoavoidtheseproblems.

  • 标签: 无线应用协议 潜在威胁 移动Agent 网络安全 数字移动电话 WAP协议
  • 简介:<正>Neuralnetworkhastheabilitiesofself-studying,self-adapting,faulttoleranceandgeneralization.Buttherearesomedefaultsinitsbasicalgorithm,suchaslowconvergencespeed,localextremes,anduncertainnumberofimpliedlayerandimpliednotes.Thispaperpresentsasolutionforovercomingtheseshortagesfromtwoaspects.Oneistoadoptprinciplecomponentanalysistoselectstudysamplesandmakesomeofthemcontainsamplecharacteristicsasmanyaspossible,theotheristotrainthenetworkusingLevenberg-Marquardtbackwardpropagationalgorithm.Thisnewmethodwasprovedtobevalidandpracticableinsiteselectionofpracticalgarbagepowergenerationplants.

  • 标签: GARBAGE power PLANT LM algorithm NEURAL
  • 简介:Chinesegovernmentattachesmoreandmoreattentionsonnewenergyvehiclesinrecentyears.Itseemsthatnewenergyvehicles,especiallyhybridvehicles,willreplaceconventionalfuelcarsinthefuture.Permanentmagnetmotorsandhybridcarbatteriesarethemostcrucialcomponentsfornewenergycarsandrareearthmaterialisakeytotheproductionofpermanentmagnetmotorandhybridvehicles.Therefore,it

  • 标签: MAGNET PERMANENT replace NDFEB INSTRUMENTS coerciv
  • 简介:APPLICATION OF WAXD AND SAXS TO STRUCTURAL ANALYSIS OF PA1010+BMIAPPLICATIONOFWAXDANDSAXSTOSTRUCTURALANALYSISOFPA1010+BMI¥Hon...

  • 标签: SAXS WAXD
  • 简介:采用耳穴贴压方法治疗30例更年期综合征患者,主穴取肾、神门、交感和内分;必。头晕目眩、记忆力下降、头痛者加肝、皮质下、肾上腺和内耳;失眠烦躁、潮热出汗者加心、肺和三焦。治疗3个疗程后,临床症状消失,月经周期紊乱明显改善者25例;临床症状减轻,月经周期紊乱明显改善者4例:经过治疗,病情无改变1例,总有效率为96.7%。

  • 标签: 耳穴贴压 更年期综合征 针灸 月经周期 主穴
  • 简介:Usingequivalentblackbodytemperature(TBB)dataretrievedfrommeteorologicalsatelliteGMS-5during1996-2002,thecorrelationbetweenthecircularsymmetric/asymmetriccomponentofTBBandtheintensityoftropicalcyclone(TC)atvarioustimelagsfrom0to48hisanalyzedfortheNorthwestPacific(0°-50°N,120°-155°E),excludinglandedandnear-coastsamples.ItisfoundthatthetotalTBBnearsoutheastoftheeyewall,thecircularsymmetriccomponent,andthesumoftheamplitudesoftangentialwavenumbers1-10(SA10)oftheTBBbetweentheradiiof0.8°and1.7°aresignificantlyandnegativelycorrelatedwiththeTCintensityatvarioustimelagsfrom0to48h.Especially,themaximum24-hlagcorrelationcoefficientsreach-0.52,-0.58,and-0.625,respectively.AstatisticalpredictionschemeforTCintensityisdevelopedbasedonclimaticpersistent,synoptic,andTBBfactorsbystepwiseregressiontechnique.ItisfoundthatthevariancecontributionoftheaveragedTBBovertheringbetween1.0°and1.5°fromtheTCcenterranksthefourthintheequationfor12-hTCintensityprediction,andthoseofthetotalTBBnearsoutheastoftheeyewallandthedifferencebetweenmaximumandminimumTBBbetween1.1°and1.5°rankthethirdandfifthrespectivelyinthe24-hforecastequation.Itisalsoshownthat,withTBBfactors,thefollowingpredictionsareimprovedcomparedtotheschemewithoutTBBfactors:48-hpredictionforseveretropicalstorm(STS),12-hpredictionforTCwithaweakeningrategreaterthan15ms~(-1)/12h,24-hintensitypredictionforTCwithalmostnointensitychange,and48-hpredictionforTCintensifyingfasterthan10ms~(-1)/48h.

  • 标签: 热带气旋 强度预报 黑体温度 天气预报
  • 简介:ObjectivesToanalyzethesix-minutewalktest(6MWT)andgasexchangeof5hearttransplantationpatientsandtoapproachthevariationtendencyofexercisetolerance,oxygenuptake(VO2)andheartratechronotropicresponse.Methods5casesofhearttransplantationpatients(age25~52years)wereundertaken6MWT6~30monthsafteroperation,synchronizinggasexchangingparametersweremeasuredbywirelessportableremotesensingK4B2gasanalyzer,51normalcontrolswerecompared.ResultsThesix-minutewalkdistance(6MWD)of5patientswere(592.6±26.7)m(558~625)m,theascendingtendencyduringexercisewasslower,themaximumheartrateswere80%±6%ofage-predictingmaximalheartrate,lowerthannormalcontrol(86%);theendpointVO2/kgwere(21.8±1.4)mL/min·kg(19.94~23.60)mL/min·kg.ConclusionsThe6WMDandVO2of5patientsreachednormalrange,buttheheartratechronotropicresponseandVO2ascendingtendencywereslowerthanthoseofnormalcontrols.

  • 标签: 六分钟步行测试 心脏移植 氧摄取 心率
  • 简介:ApplicationofMulti-GridMethodtotheCoputationofElectromagneticScateringProblemsTXApplicationofMultiGridMethodtotheComputationo...

  • 标签: :Multi-grid METHOD Diakoptic theory INTEGRAL equation
  • 简介:<正>Anadvancedsilica-dominatedmatrixtechnologyplatformanditsapplicationwereintroducedinthispaper.Throughnovelproprietaryprocessing,theadvancedsilica-dominatedmatrixwaspreparedfromtheuniquesilicasolandpseudo-boehmite.Thematrixporesizedistributionandaciditycanbetailoredtoprovideoptimalcoke-selectivityandbottoms-crackingabilitymatchedtofeedstockcharacteristics.AnovelFCCcatalyst(RSC-2006)forreducingcokeandslurryyieldswasdevelopedbasedonthesilica-dominatedmatrixtechnologyplatform.TheresultsofcommercialapplicationofthesaidtechnologyindicatedthattheRSC-2006catalystexhibitedexcellentperformanceonbottomscracking,cokeselectivityandhighvalueproductsyields.

  • 标签: MATRIX FCC catalyst SILICA SOL bottoms
  • 简介:AbstractAllergic contact dermatitis is a common clinical allergic disease. The patch test is the gold standard for finding and clarifying contact allergens. With the deepening understanding of the epidemiology, pathogenesis, and clinical manifestations of contact dermatitis, as well as the increased requirements for the standardized application of patch tests, the relevant consensus needs to be continuously updated. This consensus is updated on the basis of the version issued in 2015. In this revised version, it refines the selection of clinical indications, improves the judgment and interpretation of results, adds delayed detection and patient education, and so on, which aims to further standardize clinical applications and improve the value of patch test.

  • 标签: allergens allergic contact dermatitis Chinese expert consensus patch tests
  • 简介:Manyglobalemissionreductionstrategieshavebeenproposed,butfewhavebeenassessedquantitativelyfromtheviewofequality,efficiencyandeffectiveness.Integratedassessmentmodels(IAM)isoneoftheeffectivewaystomakeclimatepolicymodeling.SointhispaperwedevelopedtheMRICES(Multi-regionalintegratedmodelofclimateandeconomywithGDPspillovers)model,whichisanIAMbutextendstoincludeGDPspillovermechanism,tomakeassessmentonseveralstrategiesforglobalemissionreduction,includingtheegalitarianismstrategy,theUNDPstrategyandtheCopenhagenAccord.Using1990asabaselineforhistoricalemissionlevels,theegalitarianstrategyarguesthatdevelopedcountriesshouldimplementurgentemissionreductions,whereasdevelopingcountriesareallowedrelativelyhigherfutureemissionquotas.TheUNDPstrategyaddressestheissueofsubstantialchangesinglobaltemperaturebutacknowledgesthatdevelopingcountriesarenotabletoaffordmorecostsformitigationmeasures,whichisinequitablefromtheperspectiveofacountry’srighttodevelop.WealsosimulatedtheCopenhagenAccordtodeterminetheconsequencesbytheyear2100ifeachcountrycontinuestheircurrentemissionmitigationactions,andresultsindicatedthattheincreaseinglobaltemperaturewillbe2.8℃by2100;consequently,muchstrongeremissionreductioneffortsmustbeimplementedafter2020.Basedonanalysisonmitigationstrategies,itisrecognizedthatthecommonbutdifferentiatedresponsibilityprinciplemustbeinsistedwhenmakingglobalmitigationstrategy.Tocomplywiththisprinciple,theemissionreductionbaselineofdevelopedanddevelopingcountriesshouldbediscriminated,so1990and2005canbetakenasthebaseyearfordevelopedanddevelopingcountriesrespectively.

  • 标签: 综合评估模型 减排 发展中国家 应用 国内生产总值 发达国家
  • 简介:ResearchonnonlinearR/SmethodanditspplicationinearthquakepredictionBi-QuanWANG(王碧泉);Han-MingHUANG(黄汉明);Hong-ShunFAN(范洪顺);Chuen...

  • 标签: NONLINEAR theory FRACTAL DIMENSION EARTHQUAKE PREDICTION
  • 简介:TakingthetransportoftotalphosphorpollutantsintheBeijingMiyunreservoirforexample,wehaveobtainedthreedimensionaldistributingregularityoftotalphosphorpollutantsbythecalculationofthelinearinterpolationvalueofeachpointbetweenhorizontallayers.Thecredibilityanalysisinallusiontothismethodwascarriedoutandtheprogrammingschemeforrealizingthismethodwassetforth.

  • 标签: 水域 荧光体 三维数学模型 蓄水池
  • 简介:TheethanecrackeratasteamcrackerofYangziPetrochemicalCompany(YPC)hasbeensafelyoperatingformorethan100dayssinceapplicationofdomesticN360cokeinhibitorstartingAugust28,2004tosetanewrecordontheoperatingcycleofethanecracker,whichhasrevealedgreatsuccessincommercialapplicationofthisinhibitor.

  • 标签: 扬子江石化公司 乙烯 抑制剂 裂解炉 涂层
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