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500 个结果
  • 简介:最近,我在整理藏品中发现一枚“隆武通宝”小平铜钱。该钱直径2.35,穿径0.55,厚0.08厘米,重3克。铜色金黄,传世无锈,文字平整清晰,字口深峻,光背。视其面文,异于一般隆武小平铜钱,显著特征为:“武”字中间一横不及竖钩,一点稍落下方。与此钱同版式者均为铁钱。经数名钱币界前辈指教,此钱为试范钱或铁范铜钱。

  • 标签: 铁范铜 铁钱 字口 折二钱 小平钱 数名
  • 简介:内蒙古凉城县发现安阳、戈邑布同范铁范张文芳在钱币学和货币史的研究中,钱范、钞版等实物,具有珍贵的价值,历来受到有关学者的关注。1990年2月,内蒙古博物馆收集到一件出于内蒙古中南部凉城县的布范,并且为安阳、戈邑布并存于一范的铁范。1989年秋,乌兰察...

  • 标签: 内蒙古 凉城 乌兰察布盟 同范 巴彦淖尔盟 赵武灵王
  • 简介:Acomparativestudyofnewmagnesiumalloysdevelopedforelevatedtemperatureapplicationsinautomotiveindustry,Adevelopmentofvirtualprototypingmanufacturingsystemforhighpressurediecastingprocesses,Afinishmachiningstrategyforrapidmanufacturedpartsandtools,Anewmanufacturingtechnologyforinductionmachinecopperrotors,AStudyonPerformanceEvaluationandImprovementofSteeringWheelwithMgDieCastingCore,AstudyonprocessesandmechanicalpropertiesofdiecastA.380V6engineblocks.

  • 标签: 压力铸造 加工工艺 镁合金 自动监测
  • 简介:FabricationandMechanicalPropertiesofCu-basedBulkAmorphousAlloys,InvestigationofAl-Sicompositionsforthinfilmapplications,Resinstobecheerful,Vacuumcastingwithroomtemperaturevulcanizingrubberandaluminiummouldsforrapidmanufacturingofqualityparts:acomparativestudy.

  • 标签: 真空铸造 铜合金 力学性质 铝硅复合材料 室温条件
  • 简介:HardnessandyieldstrengthincastMg-Alalloys;HEALTHANDSAFETYASPECTSOFINVESTMENTCASTINGWAXES;Highaluminacementsasbindersforinvestmentcastingshells;IIncreaseinCalculationSpeedofRadiativeHeatTransferinPrecisionCastingFurnacesofGas-TurbineBlades;ImprovedCastingProcessforLargeSingleCrystalGasTurbineComponents;IncreasetnCalculationSpeedofRadiativeHeatTransferinPrecisionCastingFurnacesofGasTurbineBlade

  • 标签: 精密铸造 镁铝合金 热转换 机械性质
  • 简介:Diespray,diecostanddielife;DIE-CASTCOPPERROTORSFORIMPROVEDMOTORPERFORMANCE;DiecastabilityofMg-AI-SrHighTemperatureCreepResistanceAlloysBasedonLaboratoryEvaluations&ComponentDieCastingTrials;Diesandtoolsforhighperformanceapplications;EarlyResidualStressDevelopmentInAluminumDieCastingDies

  • 标签: 压力铸造 机械性质 铝合金 循环工艺
  • 简介:3DTHERMOMECHANICALSIMULATIONOFTHESECONDARYCOOLINGZONEOFSTEELCONTINUOUSCASTING,4thEuropeanconferenceoncontinuouscasting,Anewprocessofdirectenamelingonvarioussteelgradescoatedwithspecialelectro-depositednickel,Anapproximationmodelofcontactstatebetweenrollandstrand-computationofthree-dimensionaldeformationbehaviorofcontinuouslycaststeelstrandinmultirollspansI,Anelectricdriveforthewithdrawalrollersofacontinuous-castingmachine,Aninvestigationofslagfloatationandentrapmentinacontinuous-castingtundishusingfluid-flowsimulations,samplingandphysicalmetallurgy.

  • 标签: 连续铸造 处理工艺 钢材 近似模型
  • 简介:DentalcastingpropertiesofTi-15Zr-4Nb-4Taalloy;DETERMINATIONOFINTERFACIALHEATTRANSFERCOEFFICIENTSININVESTMENTCASTING;DETERMININGWAXPATFERNDIMENSIONSININVESTMENTCASTINGUSINGVISCOELASTICMODELS;DevelopmentofacheepcreepresistantMg-Al-Zn-Si-basealloy;Dynamicprocessesduringpouringofshellmoldsininvestmentcasting。

  • 标签: 精密铸造 蠕变阻抗 力学处理 外壳空模 锌-硅基合金
  • 简介:Preparationofthehoneycombpatternedporousfilmofbiodegradablepolymerfortissueengineeringscaffolds;Productionofoutlooksforprecisioncostingdevelopment;ProductionofTantalumPowderbyMagnesiothermicReductionofFeedPreform;REACTIONSYNFIIESISOFREFRACTORYMETAL-CERAMICCOMPOSITES;Researchonthehighperformancesiliconcarbideceramicsandsiliconcarbidebasedcomposites。

  • 标签: 蜂窝模式 铸造工艺 多孔渗水薄膜 生物降解聚合物