简介:在这份报纸,我们在场一三维(3D)在为收音机频率的晶片水平的真空包装技术微机电的系统(RFMEMS)共鸣器,低损失的硅vias在被用来播送RF发信号。Au-Sn焊接结合被采用象电的导体一样提供真空封装。封装帽子的一个RF模型被建立评估包装的寄生效果,它提供3DRFMEMS封装的一个有效设计答案。与建议包装结构,24dB的signal-to-background比率(SBR)被完成,以及共鸣器的优秀因素(Q因素)在包装以后从8000~10400增加。包装共鸣器有线性频率温度(英尺)在在0楨?慰数?之间的一个温度范围特征?牵敶?牡?牰癯摩吗??
简介:Inthispaper,weproposeahighlyautomaticapproachfor3Dphotorealisticfacereconstructionfromasinglefrontalimage.Thekeypointofourworkistheimplementationofadaptivemanifoldlearningapproach.Beforehand,anactiveappearancemodel(AAM)istrainedforautomaticfeatureextractionandadaptivelocallylinearembedding(ALLE)algorithmisutilizedtoreducethedimensionalityofthe3Ddatabase.Then,givenaninputfrontalfaceimage,thecorrespondingweightsbetween3DsamplesandtheimagearesynthesizedadaptivelyaccordingtotheAAMselectedfacialfeatures.Finally,geometryreconstructionisachievedbylinearweightedcombinationofadaptivelyselectedsamples.Radialbasisfunction(RBF)isadoptedtomapfacialtexturefromthefrontalimagetothereconstructedfacegeometry.Thetextureofinvisibleregionsbetweenthefaceandtheearsisinterpolatedbysamplingfromthefrontalimage.Thisapproachhasseveraladvantages:(1)Onlyasinglefrontalfaceimageisneededforhighlyautomaticfacereconstruction;(2)Comparedwithformerworks,ourreconstructionapproachprovideshigheraccuracy;(3)ConstraintbasedRBFtexturemappingprovidesnaturalappearanceforreconstructedface.
简介:利用水热合成方法合成了2个新的配位聚合物[Ag(4,4′-bpy)(H2PO4)].2H2O(1)和[Cu4(L)8H4](2)(4,4′-bpy=4,4′-联吡啶,L=4-咪唑基苯甲酸),并通过元素分析、红外光谱和X-射线单晶衍射方法确定了该化合物的晶体结构.结构分析表明化合物1属于单斜晶系,P2/c空间群,晶胞参数a=8.4909(17)nm,b=8.7284(17)nm,c=18.498(4)nm,β=100.99(3)°,V=1.3458(5)nm3,Z=4,R1=0.0362,ωR2=0.0966.化合物1展示了一个一维的链式结构.化合物2属于单斜晶系,C2/c空间群,晶胞参数a=24.509(5)nm,b=18.957(5)nm,c=17.246(5)nm,β=119.807(5)°,V=6.953(3)nm3,Z=4,R1=0.0455(3564),ωR2=0.1519(6161).化合物2中存在着丰富的π…π堆积作用.
简介:Asupramolecular1Dferromagneticsystemwasstudiedexperimentallyaswellastheoretically.Hybriddensityfunctionaltheory(DFT)calculationswerebasedontheX-rayanalysis.TheresultsofDFTcalculationsandMcConnellmechanismhavecontributedtotheunderstandingofthefactorsgoverningtheexchangecouplingofmagnetisminthecrystalpacking.Boththeexperimentalevidenceandtheoreticalcalculationindicatethatspindensityin2-iodonitronylnitroxide(INN)radicalsconfirms1Dferromagneticchainwithinter-chainantiferromagneticinteraction.
简介:Inthispaper,weareconcernedwiththeglobalexistenceandconvergenceratesofthesmoothsolutionsforthecompressiblemagnetohydrodynamicequationswithoutheatconductivity,whichisahyperbolic-parabolicsystem.TheglobalsolutionsareobtainedbycombiningthelocalexistenceandaprioriestimatesifH3-normoftheinitialperturbationaroundaconstantstatesissmallenoughanditsL1-normisbounded.Aprioridecay-intimeestimatesonthepressure,velocityandmagneticfieldareusedtogettheuniformboundofentropy.Moreover,theoptimalconvergenceratesarealsoobtained.
简介:Inthisstudy,weevaluatethevaluesoflatticethermalconductivityκLoftypeIIGeclathrate(Ge34)anddiamondphaseGecrystal(d-Ge)withtheequilibriummoleculardynamics(EMD)methodandtheSlack'sequation.ThekeyparametersoftheSlack'sequationarederivedfromthethermodynamicpropertiesobtainedfromthelatticedynamics(LD)calculations.TheempiricalTersoff'spotentialisusedinbothEMDandLDsimulations.Thethermalconductivitiesofd-Gecalculatedbybothmethodsareinaccordancewiththeexperimentalvalues.ThepredictionsoftheSlack'sequationareconsistentwiththeEMDresultsabove250KforbothGe34andd-Ge.Inatemperaturerangeof200-1000K,theκLvalueofd-GeisaboutseveraltimeslargerthanthatofGe34.
简介:ThecrystalstructureofN-(2,3,4,6-tetra-O-acetyl-β-D-gly-cosyl)-thiocarbamicbenzoylhydrazine(C22H27N3O9S)wasdeterminedbyX-raydiffractonmethod.Thehexopyranosylringadoptsachairconformation.Alltheringsubstituentsareintheequatorialpositions.Theacetoxyl-methylgroupisinsynclinalconformation.TheSatomisinsynperiplanarconformationwhilethebenzoylhydrazinemoietyisanti-periplanar.Thethiocarbamicmoietyisalmostcompanarwiththebenzoylhydrazinegroup.Therearetwointramolecularhydrogenbondsandoneintermolecularhydrogenbondforeachmoleculeinthecrystalstructure.Themoleculesformanetworkstructurethroughintermolecularhydrogenbonds.
简介:Anewanalyticalmodelwasdevelopedtopredictthegravitywavedrag(GWD)inducedbyanisolated3-dimensionalmountain,overwhichastratified,non-rotatingnon-Boussinesqshearedflowisimpinged.Themodelisconfinedtosmallamplitudemotionandassumestheambientvelocityvaryingslowlywithheight.ThemodifiedTaylor-GoldsteinequationwithvariablecoefficientsissolvedwithaWentzel-Kramers-Brillouin(WKB)approximation,formallyvalidathighRichardsonnumbers.WiththisWKBsolution,genericformulaeofsecondorderaccuracy,fortheGWDandsurfacepressureperturbation(bothforhydrostaticandnon-hydrostaticflow)arepresented,enablingarigoroustreatmentontheeffectsbyverticalvariationsinwindprofiles.Inanidealtesttothecircularbell-shapedmountain,itwasfoundthatwhenthewindislinearlysheared,thattheGWDdecreasesastheRichardsonnumberdecreases.However,theGWDforaforwardshearedwind(windincreaseswithheight)decreasesalwaysfasterthanthatforthebackwardshearedwind(winddeceaseswithheight).Thisdifferenceisevidentwheneverthemodelishydrostaticornot.
简介:Anadaptivemulti-scaleconjugategradientmethodfordistributedparameterestimations(orinverseproblems)ofwaveequationispresented.Theidentificationofthecoefficientsofwaveequationsintwodimensionsisconsidered.First,theconjugategradientmethodforoptimizationisadoptedtosolvetheinverseproblems.Second,theideaofmulti-scaleinversionandthenecessaryconditionsthattheoptimalsolutionshouldbethefixedpointofmulti-scaleinversionmethodisconsidered.Anadaptivemulti-scaleinversionmethodfortheinverseproblemisdevelopedinconjunctionwiththeconjugategradientmethod.Finally,somenumericalresultsareshowntoindicatetherobustnessandeffectivenessofourmethod.
简介:Thepresentworkisconcernedwithapenny-shapedDugdalecrackembeddedinaninfinitespaceofone-dimensional(1D)hexagonalquasicrystalsandsubjectedtotwoidenticalaxisymmetrictemperatureloadingsontheupperandlowercracksurfaces.ApplyingDugdalehypothesistothermo-elasticresults,theextentoftheplasticzoneatthecracktipisdetermined.Thenormalstressoutsidetheplasticzoneandcracksurfacedisplacementarederivedintermsofspecialfunctions.Forauniformloadingcase,thecorrespondingresultsarepresentedbysimplifyingtheprecedingresults.Numericalcalculationsarecarriedouttoshowtheinfluenceofsomeparameters.
简介:适用的一本有限投出的杂志的短暂流动上的杂志错误排列的效果在这研究被介绍。新3D计算液体动力学(CFD)分析方法被使用。另外,在杂志适用和转子动力学的油电影的短暂液体动力学的联合伪的计算在分析被考虑。基于结构化的网孔,当杂志在一部油电影的液体动力学模拟期间移动时,为网孔运动的一条新途径被建议更新网孔体积。存在动态网孔模型提供了由流畅不对在杂志轴承的短暂的油流动合适。杂志的运动被作为负担的边界条件与计算电影压力解决忍受转子的系统的动人的方程获得。在液体动力学和转子动力学之间的数据交换被数据文件认识到。从CFD模型获得的结果与没有对齐的杂志轴承上的以前的试验性的结果一致。电影压力,油电影力量,磨擦转矩,错误排列时刻和态度角度为没有对齐并且排列的杂志轴承计算、比较。结果显示适用的表演被被失衡的刺激,和CFD方法基于技术能有效地预言的液体结构相互作用(FSI)引起的错误排列极大地影响在一个忍受转子的系统适用的一本没有对齐的杂志的短暂流动域。
简介:三维(3D)排干的triaxial压缩和飞机的模拟拉紧的DEM(分离元素方法)测试用一个周期的房间为polydisperse范围的稠密、松开的集会被介绍。在工作,报导、排干的测试被在经常的吝啬的压力条件下面使样品变形建模。排干的行为被显示是类似于出版物理试验性的结果的品质上。主教为中间的主要压力的评价的公式被评估。批评密度的存在被显示独立于起始的收拾行李的密度和紧张条件。不同失败标准基于DEM模拟结果被比较了,并且Lade标准被发现是最适当的。一个新显微镜的织物参数被介绍在一般3D织物条件下面把卓见给结构的anisotropy。二个参数描绘压力和分别地独立于种类条件的织物的进化,这被发现。