简介:Regardforthefuzzinessandtherandomnessinsomeacousticfields,amethodforthenumericalanalysisofthe2DacousticfieldwithFuzzy-Randomparameterswasproposedbasedontheequivalentconversionofinformationentropy.Intheproposedmethod,afuzzyrandomacousticfieldwastreatedasapurefuzzyacousticfieldorapurerandomacousticfieldbytransformingallthevariablesintofuzzyvariablesorrandomvariables.Perturbationfiniteelementmethodsforanalyzingthetwo-dimensionalacousticfuzzyandrandomfieldarededuced.Thesoundpressureresponseofa2Dacoustictubeandthe2Dacousticcavityofacarwithfuzzy-randomparameterswereanalyzedbytheproposedmethodandtheMonteCarlomethod,theresultsshowthattheproposedmethodcanbewellappliedtothenumericalanalysisofthe2Dacousticfieldwithfuzzy-randomparameters,andhasgoodprospectofengineeringapplication.
简介:Laminatedcompositematerialsarewidelyimplementedinseveralengineeringconstructions.Foritsrelativelightweight,thesematerialsaresuitableforaerospace,military,marine,andautomotivestructuralapplications.Toobtainsafeandeconomicalstructures,themodellinganalysisaccuracyishighlyrelevant.Sincemeshlessmethodsintherecentyearsachievedaremarkableprogressincomputationalmechanics,thepresentworkusesoneofthemostflexibleandstableinterpolationmeshlesstechniqueavailableintheliterature—theRadialPointInterpolationMethod(RPIM).Here,a2Dapproachisconsideredtonumericallyanalysecompositelaminatedbeams.Boththemeshlessformulationandtheequilibriumequationsrulingthestudiedphysicalphenomenonarepresentedwithdetail.Severalbenchmarkbeamexamplesarestudiedandtheresultsarecomparedwithexactsolutionsavailableintheliteratureandtheresultsobtainedfromacommercialfiniteelementsoftware.Theresultsshowtheefficiencyandaccuracyoftheproposednumerictechnique.
简介:摘 要: 中文摘要:作为当代社会文化传播的重要力量,公益广告在我国已经取得了很大程度的发展。本文 从公益广告的特点和表达形式出发,首先分析了二维动画在公益广告应用的特点; 然后研究了二维动画在公益广告创作中的作用,通过二维动画能够使公益广告有效地传达信息,引起人们的关注; 最后阐述了自己利用二维动画进行环保类公益广告的设计心得。
简介:摘要:在连接器制造业中,高精密零部件是不可或缺的组成部分。由于连接器的制造精度要求高,需要使用精密的制造工艺及检测设备。如果存在制造缺陷、尺寸偏差等问题,会影响产品的性能,甚至造成设备的损害。因此,对连接器关键尺寸的质量控制特别重要。视觉检测技术作为一种高效、精确的质量控制手段,广泛地应用于在连接器制造业中。本文提出一种某连接器柔性2D视觉检测方案,为产品的柔性检测、质量控制和精益化改善提供新的思路。
简介:1IntroductionMechanicalCADsystemsuse3Dgeometricrepresentationtoformtheglobalproductinformationmodelforsatisfyingthewholelife...
简介:客观:评估实用性二维(2D)andthree维(3D)在LeForttype破裂的鉴定和分类计算了断层摄影术(CT)。方法:有Le堡垒破裂的不同类型的62个病人经历了CTscanning和3D-CT重建。数据被多平面的重建(MPR)分析,表面分别地遮了显示(SSD)和显示的体积(VR)。结果:有LeFortⅠ的病人。Le堡垒Ⅱ破裂和Le堡垒Ⅲ骨折说明了16.1%,14.5%并且12.9%respectively。复合破裂是最普通的类型并且说明了56.5%(n=35,有Le堡垒Ⅰ+Ⅱ骨折,有Le堡垒Ⅱ+Ⅲ骨折的10个盒子和有Le堡垒Ⅰ+Ⅱ+Ⅲ骨折的7个盒子的18cases)。55个盒子在maxillofacialregion.2D-CT与另外的破裂共存了能被用来与3D-CT,而是Le堡垒类型破裂的真实印象相比更精确地定义微小的破裂和深结构的破裂不能正确地在2D-CT上被评估。3D-CT能清楚地表明Le堡垒类型破裂的整个形状并且识别Le堡垒破裂的分类。结论:3D-CT是为Le堡垒类型破裂的诊断的最好的成像方法并且能提供空间关系的珍贵信息,特别为在操作前的处理计划的设计。
简介:Interactivepickingisafundamentaltaskforprocessingdigitalgraphicsandimages.Combiningtwo-dimensional(2D)andthree-dimensional(3D)viewsisanimportanttrendinprocessingmedicalsliced-geometries.Withthegoalofaccuratelypickingpointsinsliced-geometries,wepresentamethodtopickpointsinteractivelybycombining2Dand3Dviewsofsliced-geometries.Fourviewwindowsareconstructedtorendersliced-geometriesusingmedicalimaginginteractiontoolkit(MITK):threefor2DslicesparalleltotheXY,YZ,andXZplanesandoneforsurfacerendering.Pointspickedinaviewwindowcanberenderedandmodifiedinanywindow.Afterapointispicked,itisimmediatelyconvertedintoaworldcoordinateandstored.Pointsareonlyrenderedandmodifiedbasedontheirworldcoordinates.Thispickingmethodcanbeusedforfitting,observing,andmeasuringlocalregions.Thismethodcanalsobeusedforinteractivesegments.Ourexperimentshowsthatthepickingmethodisaccurateandhasareal-timepickingeffect.
简介:在动画色彩设计中,录第一章绪论...11.1研究背景...11.1.1动画片的发展...21.1.2动画片色彩设计的现状...21.2研究意义...31.3研究方法...3第二章色彩概述...52.1色彩概述...52.1.1色彩的概念和特征...52.1.2色彩的作用...62.2色彩的发展历程...62.3色彩的分类解读...62.4色彩对心理的影响...102.4.1色彩对大众情感的影响...102.4.2色彩对大众认知的影响...102.4.3色彩对大众判别力的影响...11第三章几个典型环境中色彩运用的分析...123.1张艺谋电影中色彩的分析...123.1.1张艺谋对色彩的运用分析...123.1.2经验总结...133.2国画色彩表现的分析...133.3朱仙镇木版年画的色彩运用分析...143.4皮影戏的色彩运用分析...16第四章《童年》中人物色彩分析...184.1对人物心理的分析...184.1.1作品人物的认知能力特点...184.1.2作品人物的情感与意志...184.1.3作品人物的个性形成...184.2对色彩搭配的分析...194.3对色彩搭配与心理的关系分析...204.3.1红色的反映特征...204.3.2橙色的反映特征...214.3.3黄色的反映特征...214.3.4绿色的反映特征...224.3.5蓝色的反映特征...22第五章经验及启示...235.1色彩设计彰显人文关怀...235.1.1色彩设计应构建以人为本的理念...235.1.2人文关怀源于细节...235.2色彩设计体现个人风格...255.2.1依据内容,很多不以色彩为表现主体的动画中
简介:Inthispaper,weinvestigatethecouplingofnaturalboundaryelementandfiniteelementmethodsofexteriorinitialboundaryvalueproblemsforhyperbolicequations.Thegoverningequationisfirstdiscretizedintime,leadingtoatime-stepscheme,whereanexteriorellipticproblemhastobesolvedineachtimestep.Second,acircularartificialboundaryFRconsistingofacircleofradiusRisintroduced,theoriginalprobleminanunboundeddomainistransformedintothenonlocalboundaryvalueprobleminaboundedsubdomain.AndthenaturalintegralequationandthePoissonintegralformulaareobtainedintheinfinitedomainΩ2outsidecircleofradiusR.Thecoupledvariationalformulationisgiven.Onlythefunctionitself,notitsnormalderivativeatartificialboundaryΓR,appearsinthevariationalequation,sothattheunknownnumbersarereducedandtheboundaryelementstiffnessmatrixhasafewdifferentelements.Suchacoupledmethodissuperiortotheonebasedondirectboundaryelementmethod.Thispaperdiscussesfiniteelementdiscretizationforvariationalproblemanditscorrespondingnumericaltechnique,andtheconvergenceforthenumericalsolutions.Finally,thenumericalexampleispresentedtoillustratefeasibilityandefficiencyofthismethod.
简介:ThecrookedseismiclinesalongvalleyswereirregularpreviouslyinFuxianofShanbei,showinganirregularbranchinplane,andhardtocompleteclosegrids.Therefore,it'sdifficulttoconductreservoirinversionof2Dseismicdata.In2001,ZhongyuanOilfieldCompanycarriedoutthestudyonfieldacquisitionmethodsandseismicprocessingtechnologyinFuxian.Straightlineswerepassingthroughplateausandformedseismicgridsbyusingflexiblegeometrywithvariablelinearbins.Dataprocessinginvolvedmodel-inversionbasedrefractionstaticcorrection,surfaceconsistentamplitudecompensation,deconvolution,andpre-stacknoiseattenuation.Astheresult,seismicdatawithahighfidelitywasprovidedforthesubsequentreservoirpredictions,small-amplitudestructureinterpretationandintegrativegeologicstudy.Becausealllineswerejointedtoformgrids,comprehensiveinterpretationofreservoirinversioncouldbefinallyimplementedbyusingthepseudologgingmethodtocontrollineswithoutwells.
简介:摘要目的研究对比3D与2D腹腔镜胃癌根治术近期疗效。方法选取我院2017年1月至2018年10月收治的行腹腔镜胃癌根治术患者80例,将其随机分为2组,各30例。对照组采用2D操作系统,观察组采用3D操作系统。比较两组手术情况、术后并发症以及生存质量。结果在手术情况上,两组术中出血量、淋巴结清扫时间、数量、手术时间等对比存在统计学差异(P<0.05)。在术后并发症上,对照组发生率17.5%,观察组发生率7.5%,二者存在统计学差异(P<0.05)。在生存质量上,两组各项评分对比存在统计学差异(P<0.05)。结论3D腹腔镜胃癌根治术的近期疗效更为显著,即可减少术中出血量,缩短手术时间,减少相关并发症,提升患者生存质量,因此值得应用推广。