简介:Threenovelbenzocrownetherderivativeshavebeensynthesizedandtheircationbindingbehaviorwithuniandbi-valentmetalionswasevaluatedbythesolventextractionofaqueousmetalpicrates.Theobtainedresultsindicatethatthesize-fitofcrownetherandmetalcation,andelectroneffectofthesidearmattachedtobenzocrownethersaffecttheircationbindingabilityandselectivity.
简介:Interfacedislocationsmaydramaticallychangetheelectricproperties,suchaspolarization,ofthepiezoelectriccrystals.Inthispaper,westudythelinearinteractionsoftwointerfacedislocationloopswitharbitraryshapeingenerallyanisotropicpiezoelectricbi-crystals.Asimpleformulaforcalculatingtheinteractionenergyoftheinterfacedislocationloopsisderivedandgivenbyadoublelineintegralalongtwocloseddislocationcurves.Particularly,interactionsbetweentwostraightsegmentsoftheinterfacedislocationsaresolvedanalytically,whichcanbeappliedtoapproximateanycurvedloopsothatananalyticalsolutioncanbealsoachieved.Numericalresultsshowtheinfluenceofthebi-crystalinterfaceaswellasthematerialorientationontheinteractionofinterfacedislocationloops.
简介:ThecyclicvoltammetryandpotentiostaticelectrolysiswereusedtoinvestigatethepreparingofDy-BialloyfilmsinLiCl-DMSO(dimethylsulfoxide)system.Theeffectsofseveralfactorsincludingthepotentialofdeposition,concentrationsofmainsalts,andtheconcentrationratioofDyCl3toBi(NO3)3werestudied.Dy-Bialloyfilmscontaining4.82%-80.62%(massfraction)dysprosiumwerepreparedinDyCl3-Bi(NO3)3-LiCl-DMSOsystembycontrollingthesystemcompositionanddepositionconditions.Thefilmsaregray,uniform,metalliclusterandadherefirmlytothecoppersubstratesanalyzedbySEM(scanningelectronmicroscope),EDS(X-rayenergydispersiveanalysis),andXRD(X-raydiffraction).Afterheattreatmentat718Kforlh,thealloyphaseofDy-BiwasfoundinXRDpatterns.
简介:Thetraditionalproportionalsolenoidhasdisadvantages,suchasbigsizeanddifficultyremoving.Sothispaperintroducesanewtypeofbi-directionalproportionalsolenoid,andexpoundsthestructureandworkingprincipleindetail.Onthisbasis,themathematicalmodeloftheproportionalsolenoidisestablished,anditsoutputcharacteristicisanalyzedbythefiniteelementtoolAnsoft/Maxwell.Itsstructureparameters'influenceontheoutputcharacteristicalsoisdiscussedthroughtheelectromagneticfieldanalysis.Thesimulationresultsshowthatthisnewtypeofbi-directionalproportionalsolenoidcanobtainagoodstaticcharacteristicwithoutthesamemagneticcircuitcontrolofthetraditionalproportionalsolenoid.
简介:Fourier不可分的操作员在Fourier分析和部分微分方程起一个重要作用。在这份报纸,我们处理固定双线性并且双性人参数Fourier不可分的操作员,它被一个参数FIO的学习激发并且双线性并且双性人参数Fouriermultipliers和伪differential操作员。当他们在空间变量有紧缩的支持时,我们考虑如此的FIO。如果他们包含一个真实值的阶段(x,,)它在频率变量是联合同类的,,并且顺序零的振幅支持了离开轴和antidiagonal,我们能证明固定控制local-L2盒子。一些更强壮的固定结果也在阶段功能上在更多的限制条件下面被获得。因此,我们的结果扩大固定结果为双线性并且一个参数FIO并且双线性并且双性人参数伪differential操作员到盒子双线性并且双性人参数FIO。
简介:有双性人目标策略的一个扩充Lagrangian信任区域方法被建议因为解决非线性的平等抑制了优化,它在惩罚类型方法和没有惩罚的之间掉落。在每次重复,试用步被在一个信任区域以内最小化一个二次的近似模型到扩充Lagrangian功能计算。模型是为非强迫的优化的标准信任区域subproblem并且能被许多存在方法高效地因此解决。选择惩罚参数,辅助信任区域subproblem与限制违背有关被介绍。结果,惩罚参数不必monotonically正在增加并且不趋于到无穷。双性人目标策略,与客观功能和限制违背的措施有关,被利用决定试用步是否将被接受。方法的全球集中在温和假设下面被建立。数字实验被做,它在各种各样的困难的状况上说明算法的效率。
简介:Besidesofconsideringofthemaximizationofpublicinterest,thebenefitofpassengersandrailwayenterprisesarebothconsideredandabi-levelprogrammingapproachispresentedinordertoseektheoptimalrailwaypassenger-ticketpricingstrategyundertheconditionofcompetitionamongdifferentintercitytrafficmodes.Therearetwobi-levelprogrammingproblems.Onebi-levelproblemistodeterminearailwaypassenger-ticketaveragepricestrategytomeet.theobjectiveofmaximizingtheconsumersurplusundertheconditionofmulti-modaltransportationwithelasticdemand.Theotherbi-levelproblemistodeterminethepriceofdifferentkindsofthepassengertrainstomeettheobjectiveofmaximizingtherailwayrevenuewheretheaveragepriceandthedemandoftherailwayisdetermined.Aheuristicalgorithmforthetwobi-levelprogrammingmodelsisalsoproposed.Finallytheapplicationsofthemodelanditsalgorithmareillustratedwithanumericalexample.
简介:L2功能的一双Bessel序列产生的双性人内部的产品functionals被介绍。这些functionals是L2和l2的内部产品的经常的multiples,这被显示出,如果并且仅当他们在空间两个都是移动不变的(或时间)并且在里面阶段。这结果然后被使用描绘双框架和L2的双性人直角的Riesz底。
简介:Thedielectricpropertiesofceramicswithcompositionof(Sr1-xBix)TiO3+x/2(wherex=0.05~0.70)weremeasuredatfrequencyof1MHz.Theexperimentalresultsindicatethatthedielectricpropertiesof(Sr1-xBix)TiO3+x/2systemaregreatlyvariedwithanincreaseofthestoichiometricamountsofBi2O3.Therelativepermittivityofthesolidsolutionsishigh,andthedissipationfactorislow.Thepositronannihilationtechnique(PAT)wasadoptedtostudythedefectstructure.AnexplanationofthedielectricpropertiesofBi-dopedSrTiO3ceramicshasbeensuggestedintermsofelectron-compensationandvacancyordefect-compensationmechanismsandspace-chargepolarizationmechanism.
简介:1992年,美国放射学会(TheAmericanCollegeofRadiology,ACR)制定了乳腺影像学报告及数据系统(brestimagingreportinganddatasystem,BI-RADS).该系统针对乳腺钼靶摄影影像进行了规范而详尽的描述,运用该系统对乳腺X线影像进行分级评估,对乳腺疾病诊断的敏感性、特异性及准确性均有较大提高.该标准2003年第4版修订时同时制定了乳腺超声诊断标准(BI-RADS-US),BI-RADS-US提出乳腺超声诊断评估的0~6级标准,有利于学术交流和数据利用.乳腺疾病特别是乳腺癌的发病率与以往相比均明显上升,乳腺癌已居我国大中城市女性恶性肿瘤发病之首.
简介:有在紧张和压缩的不同moduli的材料被称为双性人模量材料。Graphene是有最高的力量和最薄的厚度的如此的一种材料。在这份报纸,受到温度效果并且放了在Winkler地基上的双性人模量横梁的机械反应被学习。关于中立的轴位置和双性人模量基础横梁的正常紧张的未经决定的参数的微分方程被建立。然后,地基横梁的正常压力,弯曲时刻,和排水量的分析表情被导出。同时,一个计算过程基于有限元素方法(女性)被开发获得双性人模量结构的温度压力。获得的双性人模量解决方案能恢复古典模量解决方案,这被显示出,并且结果由分析表达式,现在的女性的过程,和传统的女性的软件获得是一致的,它验证现在的分析模型和过程的精确性和可靠性。最后,双性人模量结果之间的差别和古典一样的模量结果被讨论,并且为在实际工程计算并且优化某些双性人模量成员的几个合理建议被介绍。
简介:Theintensityandpositionofthecouplingpointsinhighbirefringence(Hi-Bi)fiberscanbedetectedeffectivelyusingdistributedpolarizationcoupling(DPC)detection.Thedetectionsensitivitycandecreaseduetomechanicalvibrationdisturbanceandenvironmentnoise.Thus,amethodbasedonempiricalmodedecompositionisproposedtodetectweakmodecouplingpoints.Thesimulationandexperimentalresultsillustratethattheproposedmethodcansuppressthenoiseeffectivelyandimprovesensitivitysignificantly.Themethodcanidentifycouplingpointsasweakas-60dBembeddedinnoiseautomaticallyandeffectively.ThealgorithmisapplicableforDPC,andtheexperimentalsensitivityisimprovedby10dB.