简介：TheoriginofChinesesealsremainsobscureinmodernresearch.Mostpublications,influencedbythetraditionalpointofview,havedealtwiththesealshandeddownfromtheEasternZhou(771-256B.C.).Onlyafewstudieshavediscussedsealsfromtheirearliest-andstillneglected-history.Therehaveevenbeensomesuggestions,basedontheideaofusingasealandusingitonclayfirstdevelopedinMesopotamia,thatthesealwasintroducedtoChinafromtheNearEast.ThisproposedforeignoriginmakesthehistoryofChinesesealsmorecomplicated.

简介：Akindofdryrefractorysealingmaterialhasbeendevelopedtorepairthefinecracksincokeovenchamber.Withsilicasandasthemainrawmaterial,thesealingmaterialisblownintocokeovenchamberbycompressedairwhilebeingapplied,andbondedtobricksurfaceorfilledinfinecracksofchamberunderrightpressure.Thephysicalpropertiesofthematerialaresimilartothoseofsilicabricksduringitsapplication.Soitcanbeadaptedtoconditionsofcokeovenandhasgoodservicelife.Thestudyandapplicationresultsofthesealingmaterialaredescribedinthispaper.

简介：摘要目的探讨负压封闭引流术（VSD）在基层骨科皮肤软组织重度损伤患者特别是四肢部位损伤患者中的应用效果。方法2009年9月-2012年10月我院骨科对收治的88例四肢皮肤软组织重度损伤患者的创伤部位进行手术清创后，使用负压封闭引流并用敷料覆盖全创面。结果10例患者使用VSD治疗后行清洁换药伤口愈合；24例患者持续负压引流5d～3w，拆除敷料后创面经直接缝合或取皮植皮术全部愈合；42例患者治疗5d～2w，更换VSD材料2次后，创腔变浅行二期缝合后愈合；12例患者行3次VSD治疗后经植皮术愈合。结论负压封闭引流技术能有效预防创面感染，促进肉芽组织的生长，是治疗皮肤软组织重度损伤的一种有效方法，值得在基层医院推广。

简介：PTFE在下面的压缩、封上的特征周期在房间温度卸掉负担被学习以便包括地评估控制阀门的周期的封上表演。卸掉的特征与装载的不同，因此在卸掉并且装载的曲线之间有磁滞现象。压缩磁滞现象是引起封上磁滞现象的主要因素。在它进入相对稳定的区域以前，PTFE的漏率遵循幂定律。最后，压缩、封上的特征上的工作压力的效果被讨论。试验性的结果证明工作压力在压缩变丑上有小效果，但是在漏率上有大影响。

简介：DearEditor,Inarecentinterventionalcasereport,Allonetal~([1])hydratedcornealstromawithcefuroximetosealasmalltraumaticleakycornealperforationthatwasunresponsivetopriorsoftbandagecontactlensapplicationfor6d.Wewouldliketojustremindthepossiblecomplicationsofintracameralcefuroximeineyeswithalreadycompromised

简介：AnewmethodforcorrosionprotectionofAl-basedmetalmatrixcomposites(MMC)wasdevelopedusingtwo-stepprocess,whichinvolvesanodizinginH2SO4solutionandsealinginrareearthsolution.Corrosionresistanceofthetreatedsurfacewasevaluatedwithpolarizationcurves.TheresultsshowedthattheeffectoftheprotectionusingrareearthsealingisequivalenttothatusingchromatesealingforAl6061/SiCp.TherareearthmetalsaltcanbeanalternativetothetoxicchromateforsealinganodizedAlMMC.

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简介：TechnologicalprocessofrareearthsealinganodizedLY12(2024)alloyisintroduced.Corrosionbehaviorofthefilmwasstudiedbypolarizationcurvesandelectrochemicalimpedancespectroscopy(EIS).Theresultsshowedthatthecoatingremainedpassivityatthepotentialrangefromtheopencircuitpotential(-780mV)to-250mVinNaClsolution.Whenthepotentialexceeded-200mV,corrosionreactionhappenedonthecoating.theresultsofElSanalysiswasconsistentwiththeresultsofpolarizationcurves.

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简介：BackgroundPoorwoundhealingorpostoperativeinfectionafteropen-heartsurgeryismostcommonlyseen.Ifnottreatedintimeortheinfectionprogresses,itcanleadtosternalinfection,evenmediastinalandpericardialinfection,causingahighermortalityrate.Vacuumsealingdrainage(VSD)isanewtechnologytopromotewoundhealing.WestudiedtheuseofVSDtechniqueinpoorwoundhealingafterheartvalvesurgerytoseeifitcouldachievegoodtherapeuticefficacy.MethodsFrom2013Octoberto2014OctoberinGuangdongGeneralHospital,86casesoftheapplicationofvacuumsealingdrainagetechniqueinthetreatmentofcardiacnonunionaftervalvereplacementinpatientswithnursingobservation.Thetreatmenttime,deathrateandinfectionrate,etcwerecompared.ResultsWoundhealingtimeof86patientsreceivingvacuumsealingdrainagewas14.6±3.6days,andnopatientdied.Twopatientscamebacktohospitalforrepairduetodehiscenceoftheincisionafterdischarge.ConclusionNursingobservationanddrainagemanagementwerethekeyofVSD.VSDtechniqueisworthytobepopularizedclinically.

简介：Althoughmanyliteratureshavebeenfocusedontheunderneathflowandlossmechanism,veryfewexperimentsandsimulationshavebeendoneundertheengines'representativeworkingconditionsorconsideringtherealcavitystructureasawhole.Thispaperaimsatrealizingthegoalofdesignofefficientturbineandscrutinizingthevelocitydistributioninthevicinityoftherimseal.Withtheaidofnumericalmethod,anumericalmodeldescribingtheflowpatternbothinthepurgeflowspotandwithinthemainstreamflowpathisestablished,fluidmigrationanditsaccompaniedflowmechanismwithintherealisticcavitystructure(withrimsealstructureandconsideringmainstream&secondaryairflow'sinteraction)isusedtoevaluateboththeflowpatternandtheunderneathflowmechanismwithintheinwardrotatingcavity.Meanwhile,theunderneathflowandlossmechanismarealsostudiedinthecurrentpaper.Thecomputationalresultsshowthatthesealingairflow'singestionandejectionarehighlyinterwoundwitheachotherinbothupstreamanddownstreamflowoftherimseal.Boththedownstreamblades'potentialeffectsaswellastheupstreamblades'waketrajectorycanbringabouttheingestionofthehotgasflowwithinthecavity,abruptincreaseofthestaticpressureisbelievedtobethemainreason.Also,theresultsindicatethatsealingairflowejectedthroughtherearcavitywillcauseunexpectedlossneartheoutletsectionofthebladesinthedownstreamoftheHProtorpassages.