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  • 简介:Inrecentyears,lifecycleassessment(LCA)methodiswidelyusedingreenmanufacturing,energysaving,andemissionreductionofironandsteelproduction.BasedonthecarbonsteelLCAresearchandrelevantstandardsathomeandabroad,theapplicationofLCAinstainlesssteelinBaosteelwasstudied.Throughthestudyofstainlesssteel'sgoalandscope,lifecycleinventory,LCAandinterpretation,knowledgeandexperienceofLCA'sapplicationinstainlesssteelwasobtained.

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  • 简介:Insomesituations,theacceleratedlifetestonenvironmentalstressforelectronicproductsisnoteasilyimplementedduetovariousrestrictions,andthusengineersarelackingofdataoftheproductlifetest.Concerningthisproblem,environmentallifeoftheprintedcircuitboard(PCB)boardiscalculatedbywayofphysicsoffailure.InfluencesofthermalcycleandvibrationonPCBanditscomponentsarestudied.BasedontheanalysisofforceandstressbetweencomponentsandthePCBboardinthermalcycleeventsandvibrationevents,fourlifecomputingmodelsofpinsandsoldereddotsareestablished.Themillerdamageratioisusedtocalculatetheaccumulateddamageofapinorasoldereddot,andthentheenvironmentlifeofthePCBboardcanbedeterminedbythefirstfailedone.Finally,anexampleisusedtoillustratethemodelsandtheircalculations.

  • 标签: 寿命计算 产品环境 电子产品 失效物理 印刷电路板 加速寿命试验
  • 简介:或许你曾不止一次地幻想着窗明几净的教室,幻想着自由自在的住宿生活,幻想着轻松有趣的大学课堂,幻想着和蔼可亲的老师和同学……然而有一天,当你真的逃离了书山题海的束缚,投入象牙塔的怀抱,成为了一名大学生,你才会发现梦想与现实的不同,

  • 标签: 中等教育 英语 阅读 理解
  • 简介:ThispaperdealswiththeCauchyproblemforadoublysingularparabolicequationwithaweightedsource■whereN≥1,1max{0,3-p-p/N}satisfying21,andα>N(3-p-m)-p.Wegivethesecondarycriticalexponentonthedecayasymptoticbehaviorofaninitialvalueatinfinityfortheexistenceandnon-existenceofglobalsolutionsoftheCauchyproblem.Moreover,thelifespanofsolutionsisalsostudied.更多还原

  • 标签: 奇异抛物方程 寿命 加权 指数和 次临界 柯西问题
  • 简介:在时代进步的浪潮下,一个划时代的变革产品,将会给生活带来怎样的改变?7月3日,一场以“【睿】见有温度的未来”为主题的福州阳光城二代产品发布盛典,给出了答案。这是阳光城在福州首度公开解读其产品焕新升级的理念。发布会现场更发布了睿life首次落地的阳光城檀悦/阳光城融侨檀府两大项目,让来宾体验阳光城二代产品【睿】Life系带给居住者的生活之悦。

  • 标签: 产品发布 阳光 二代 福州 居住者 生活
  • 简介:教材:人教版新目标英语八年级(下)单元:HaveyoureadTreasureIslandyet?课文:ACountryMusicSongChangedHerLifeForeverTeachingobjectivesBytheendoftheperiod,theteachermustenablethestudentsto:1.Understandthepassageandmastersomereadingstrategies.2.Summarizethepassagebymakingnotesandunderliningthemainideas.3.

  • 标签: 新目标英语 PASSAGE 阅读课教学 notes aware enable