简介:应用液相色谱-电喷雾离子化质谱法快速分析紫杉醇粗品中各组分.方法:用NucleosilC18(250×4.6mm,5μm)色谱柱;甲醇/水(65/35,V/V)为流动相以1mL/min的流速洗脱;检测波长227nm;柱温40℃;液相色谱出口分流20%进入离子阱质谱,以电喷雾电离源正离子模式进行质谱数据采集.结果:得到紫杉醇样品液相色谱图和质谱图,对谱图进行分析归纳,判断紫杉醇粗品中主要含有巴卡亭Ⅲ、10-去乙酰巴卡亭Ⅲ、三尖杉宁碱和2″,3″-双氢还原三尖杉宁碱.结论:本方法灵敏、可靠、快速,对紫杉醇生产、质量监控具有指导意义.
简介:DYNAMICSOFMECHANICALLYANDELECTROSTATICALLYCOUPLEDMICROCANTILEVERS;Effectofadiabaticheatinginsomeprocessesofplasticdeformation;Evaluationofkerflesslineararrays;MECHANICALLYCORNER-COUPLEDSQUAREMICRORESONATORARRAYFORREDUCEDSERIESMOTIONALRESISTANCE;Finiteelementmodelingofthethermo-electro-mechanicalcouplinginpyroelectricinfraredsensorarrays;Medicalultrasonictransducerusingcompositematerialsforacousticmatchinglayers-computersimulationsoftransducerarrays;
简介:Numericalanalysesandexperimentsonthecharacteristicsofball-typeconstant-velocityjoints;Studiesoftheeffectofspinmotiononoilfilmthicknessinelastohydrodynalnicpointcontacts;Technologicaltrendsandissuesinsealsforconstructionmachines(PartI)-sealsforhydraulicshovels;TechnologicaltrendsandissuesinsealsforturboCompressors;Technologicaltrendsandissuesinsterntubeseals……
简介:ASINGLE-CRYSTALSILICONSYMMETRICALANDDECOUPLEDGYROSCOPEONINSULATINGSUBSTRATE;ALMINIUMNITRIDEBASEDTHINFILMBULKACOUSTICRESONATORUSINGGERMANIUMSACRIFICIALLAYERETCHING;AlterationofPoisson'sratioinhighcouplingpiezoelectrics;Capacitancecouplingmicromechanicalfilter;Coupled,macro-micromodelingforhotdeformationandsintering……
简介:摘要:本文将探讨现代机械设计方法及其在未来的发展。首先分析了传统机械设计方法的局限性及现代机械设计方法的创新,包括数字化设计、模拟仿真和智能化技术的应用。随后,着眼于未来机械设计的趋势与发展方向,包括基于人工智能的设计辅助系统、可持续发展理念的融入以及新材料与制造工艺的创新。最后,总结了现代机械设计方法对未来机械设计的重要意义,并展望了未来机械设计可能带来的引领行业发展的变革。
简介:Anewflowdiagrammingschemeformappingandanalysisofmulti-productflowsinafacility;Anewgeneticalgorithmforthemachine/partgroupingprobleminvolvingprocessingtimesandlotsizes;Acousticemissionduringquenchingof42CrMo4steel;Anothersimilaritycoefficientforthep-medianmodelingrouptechnology;Investigationofabnormalwearofmassivemachinepart-welded-technicalchromiumlayersystem……