简介:2D/3DIsometricTransformationUsingSpring_MasSystemFanJin1MathewM.F.Yuen2QifuWang1ZhouJi11TheCADCenterofTheHuazhongUnviersityof...
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:Methetraxate(MTX),aclassicaldihydrofolatereductaseinhibitor,wasasuccessfulclinicalantitumoragent,havingpotentinhibitoryactivitiestoseveralkindsoftumors.Unfortunately,thecancercellkswereeasiertoproduceresistancetoMTXwhichendedinthefailureofchemotherapy.Inordertoovercometheresistanceoftumorcells,anewkindofdihydrofolatereductaseinhibitorscallednonclassicalantifolateincludingtriazines,pyrimidinesandquinazolinesweredesignedandsynthesized.Becauseofthedifferentantitumormechanismsbetweenthetwokindsofcompunds,thecancercellsresistanttoMTXmaystillbesensitivetothenonclassicalantifolate.Accordingtothistheory,somenonclassicalantifolate2,4-diamino-5-methyl-6-(substitutedbenzylamino)quinazolineswiththegeneralstructureshowninFIg.1weresynthesizedandtheirantitumoractivitiesweredeterminedinthisthesis.
简介:The2Dplanegasflowunderheating(withnonentityboundarycondition)hasbeendiscussedbytheanalyticalapproachinthispaper.Theapproximateanalyticalsolutionshavebeenobtainedfortheflowpassingvariouskindsofheatsources.Solutionsdemonstratethethermaldisplacementphenomenaarestronglydependontheheatingintensity.
简介:Cavitationisoneofthetroublesomeproblemsinrocketturbopumps,andsincemostofhigh-efficiencyrocketpropellantsarecryogenicfluids,socalled'thermodynamiceffect'becomesmoreevidentthaninwater.Inthepresentstudy.numericalandexperimentalstudyofliquidnitrogencavitationin2DLavalnozzlewascarriedout,sothattheinfluenceofthermodynamiceffectwasexamined.Itwasrevealedthattemperatureandcavitationhavestronginter-relationshipwitheachotherinthermo-sensitivecryogenicfluids.