简介：Zincwasrecentlysuggestedtobeapotentialcandidatematerialfordegradablecoronaryarterystent.Thecorrosionbehaviorofpurezincexposedtor-SBFupto336hwasinvestigatedbyelectrochemicalmeasurementsandimmersiontests.Themorphologyandchemicalcompositesofthecorrosionproductswereinvestigatedbyscanningelectronmicroscope,grazing-incidenceX-raydiffraction,X-rayphotoelectronspectroscopyandFouriertransforminfraredspectrometer.Theresultsdemonstratethattheinitialcorrosionproductsonthepurezincmainlyconsistofzincoxide/hydroxideandzinc/calciumphosphatecompounds.ThepureZnencountersuniformcorrosionwithanestimatedcorrosionrateof0.02-0.07mmy^-1duringtheimmersion,whichsuggeststhesuitabilityofpureZnforbiomedicalapplications.

简介：我们学习二维的non-self-similar的一个家庭的单个结构quasilinear的全球解决方案和他们的相互作用夸张能量守恒定律。当起始的断绝在仅仅上发生时，为盒子，二拆散统一圆和起始的数据是二个不同经常的状态，全球答案被构造，一些新现象被发现。在分析，我们首先为0t构造答案T，在二个冲击波之间的另一个冲击波发生。最后，我们给答案的大时间行为什么时候t。这种技术不包含维的减小或并列转变。

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简介：Theseeminglycontradictoryunderstandingsoftheinitialcrushstressofcellularmaterialsunderdynamicloadingsexistintheliterature,andacomprehensiveanalysisofthisissueiscarriedoutwithusingdirectinformationoflocalstressandstrain.Localstress/straincalculationmethodsareappliedtodeterminetheinitialcrushstressesandthestrainratesatinitialcrushfromacell-basedfiniteelementmodelofirregularhoneycombunderdynamicloadings.Theinitialcrushstressunderconstant-velocitycompressionisidenticaltothequasi-staticone,butlessthantheoneunderdirectimpact,i.e.theinitialcrushstressesunderdifferentdynamicloadingscouldbeverydifferenteventhoughthereisnostrain-rateeffectofmatrixmaterial.Apower-lawrelationbetweentheinitialcrushstressandthestrainrateisexploredtodescribethestrain-rateeffectontheinitialcrushstressofirregularhoneycombwhenthelocalstrainrateexceedsacriticalvalue,belowwhichthereisnostrain-rateeffectofirregularhoneycomb.Deformationmechanismsoftheinitialcrushbehaviorunderdynamicloadingsarealsoexplored.Thedeformationmodesoftheinitialcrushregioninthefrontofplasticcompactionwavearedifferentunderdifferentdynamicloadings.

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简介：有起始的equiaxed微观结构的BT25y合金的高温度的塑料变丑行为被热压缩测试调查。处理地图被建立评估力量驱散效率()并且识别流动不稳定性区域。当紧张活动范围稳定状态时，处理窗户的最佳在盖住大多数学习变丑温度和1的紧张率的区域被散布吗？