简介:Quanji()山岳位于西北中国,它是被解释一微大陆那由变形地下室和稳定的盖子阶层组成。在中国有在Quanji山岳和主要cratons之间的基因关系的一些争吵。在这研究,我们在situ锆石U-Pb和Hf获得了Yingfeng的同位素的作文()从由LA-MC-ICP-MS的申请的西北Quanji山岳的rapakivi花岗石技术。二十个U-Pb年龄大小点一致或近一致,并且他们的加权的吝啬的207Pb/206Pb年龄是1个793.9ene大陆人更低的外壳。我们测量磁性的参数(危险性和磁性的磁滞现象参数例如浸透磁化Js,浸透等温的残余的磁化Jrs,和内在的coercivityHc)十一,Hannuoba从太古代的Huaian地面降低外壳的捕虏体和九地面granulites。结果显示一般水准珍视,太古代的granulites的Js和Jrs是4122洠条敮楴?業敮慲潬祧愠摮瀠瑥潲潬祧;衜?衜?
简介:Theelasticwavepropagationphenomenaintwo-dimensionalperiodicbeamlatticesarestudiedbyusingtheBlochwavetransform.Thenumericalmodelingisappliedtothehexagonalandtherectangularbeamlattices,inwhich,boththein-plane(withrespecttothelatticeplane)andout-of-planewavesareconsidered.ThedispersionrelationsareobtainedbycalculatingtheBlocheigenfrequenciesandeigenmodes.Thefrequencybandgapsareobservedandtheinfluenceoftheelasticandgeometricpropertiesoftheprimitivecellonthebandgapsisstudied.ByanalyzingthephaseandthegroupvelocitiesoftheBlochwavemodes,theanisotropicbehaviorsandthedispersivecharacteristicsofthehexagonalbeamlatticewithrespecttothewavepropagationarehighlightedinhighfrequencydomains.OneimportantresultpresentedhereinisthecomparisonbetweenthefirstBlochwavemodestothemembraneandbending/transverseshearwavemodesoftheclassicalequivalenthomogenizedorthotropicplatemodelofthehexagonalbeamlattice.Itisshownthat,inlowfrequencyranges,thehomogenizedplatemodelcancorrectlyrepresentboththein-planeandout-of-planedynamicbehaviorsofthebeamlattice,itsfrequencyvaliditydomaincanbepreciselyevaluatedthankstotheBlochmodalanalysis.Asanotherimportantandoriginalresult,wehavehighlightedtheexistenceoftheretropropagatingBlochwavemodeswithanegativegroupvelocity,andofthecorresponding'retro-propagating'frequencybands.
简介:在这份报纸,有石墨(C)或碳nanotubes(CNT)的增加的SmCo6.9Hf0.1当演员组合金和带子被融化的弧和融化旋转分别地准备。补充说结构和磁性SmCo6.9Hf0.1上的碳借助于X光检查衍射(XRD)被调查的效果,扫描电子显微镜学(SEM),传播电子显微镜学(TEM),磁性的力量显微镜学(MFM)和颤动的样品磁强计(VSM)。尽管他们的水晶结构作为一样的Sm被描绘,微观结构和SmCo6.9Hf0.1带子的磁性的结构由于C或CNT的介绍显然被改变,这被发现尽管他们的水晶结构作为一样的Sm被描绘(公司,Hf)7单个阶段,不管碳被增加。作为结果,包含碳的带子的磁性在某个度被提高。这被认为与精制equiaxed谷物,小领域尺寸和C或CNTs富有的区域的卡住的效果有关。SmCo6.9Hf0.1(CNT)的磁性0.05条带子到达了Hc=12.5kOe,Mr=57.0emu/g和Mr/M2T=0.788。