简介:当世界都在朝向电动化、零排放之际,摩托车自然也要顺应这一潮流.宝马趁着在意大利举办的埃斯特庄园优雅竞赛(Concorsod'EleganzaVillad'Este),展现了他门的全新概念力作零排放的电动摩托车——ConceptLink.跟宝马MotorradVisionNext100Concept相比,这款车要现实得多,更有可能在不久的将来实现,灵巧的它尤其适合在城市市中心驾驶.ConceptLink很难归类,它的造型相当紧凑,车身低矮且拉长,座位平整,不管是从侧面还是从后侧,都可以很轻松地奇上去.它的座位可以调节成两人座,可以是更为动感的单人坐骑,也可以是更为实用的两人坐骑.它的座椅下有存储空间,可以很容易地用滑门打开,既满足了驾驶乐趣,又满足了功能需要.它的车身颜色采用了金属钛和哑光黑,哑光黑区域是动力机构的所在处.
简介:Wemeasurethehalf-wavevoltageofLiNbO3phasemodulatorsina26-GHzwidebandfrequencyrange,andthenanalyzeitbythephasemodulationphotonicpeakgainlinkedtotheinterferometricdemodulation.Theopticalinterferometerisconstructedwithtwo50:50couplersandtwofiberarmswitha1-mdifferenceinfiberlength.Thephotoniclinkgainpeaksarefrequencydependent,asindicatedbythedifferentialtimedelayintheinterferometer.Theproceduredescribedisanewandpracticalhalf-wavevoltagemeasurementmethodthatcanaccuratelypredictthenonlinearfrequencycharacteristicsofthephasemodulator.Moreover,themethodcanbeappliedtovarioustypesofLiNbO3phasemodulators.
简介:九年前推出的D90是尼康的经典机型,也是那个年代最值得购买的单反相机之一.它的摄像功能虽然不完善,但在那时5000元级别的单反里也是独一份.当然,今天要聊的D90可不是前段时间天天被传着要破产的尼康,而是上汽大通新推出的SUV.这款车型似乎也有独一份的噱头,那它会不会在九年后也能成为老司机们的谈资呢?
简介:由消费者定价的C2B概念被眼前这台轴距近3米的全尺寸SUV拉开了序幕。3-8座内部布局、18英寸~21英寸轮毂、五种进气格栅可选。单凭这些可选配置,就有理由在自主品牌的汽车发展史上留下重要一笔。
简介:简要及综合性地叙述了特瑞堡密封系统有限公司拥有知识产权的佐康?热塑性弹性体密封材料;D型格来?圈的结构及推荐应用的细分市场。
简介:WedesignaD-shapedfiberopticbiosensorbasedonthesurfaceplasmonresonance(SPR)ofametal-graphenelayerandsimulatethisSPRusingthefiniteelementmethod.Usingametal-graphenelayerasthesensingmaterial,surfaceplasmaresonanceissimulatedastherefractiveindexoftheexternalenvironmentrangesfrom1.33to1.36.Simulationresultsshowthatametal-graphenelayerattachedtotheD-shapedopticalfibercorecancouplewithlightunderaspecificpolarizationstateandexcitestrongplasmaoscillationsonthelayersurface.Calculatedtransmissioncoefficientsshowthattheresonancewavelengthobviouslymovestowardlongerwavelengthsastherefractiveindexofthetestmediumincreases,andasensitivityof5400nm/RIUisobtained.Becauseofitslargesurfacevolumeratioandgoodbiocompatibility,graphenemaybeutilizedinmanyapplicationsinthefieldofbiosensing.
简介:Anewscreen-spotimagingmethodbasedonopticalmeasurementisproposed,whichisapplicabletotheclose-rangemeasurementofaircraft'sthree-dimensional(3D)attitudeparameters.Lasertrackerisusedtofinishtheglobalcalibrationsofthehigh-speedcamerasandthefixedscreensontestsite,aswellastoestablishmedia-coordinate-framesamongvariouscoordinatesystems.Thelasercooperationobjectmountedontheaircraftsurfaceprojectslaserbeamsonthescreensandthehigh-speedcamerassyn-chronouslyrecordthelight-spots'positionchangingwithaircraftattitude.Therecordedimagesequencesareusedtocomputetheaircraftattitudeparameters.Basedonthematrixanalysis,theerrorsourcesofthemeasurementaccuracyareanalyzed,andthemaximumrelativeerrorofthismathematicalmodelisestimated.Theexperimentalresultshowsthatthismethodeffectivelymakesthechangeofaircraftpositiondistinguishable,andtheerrorofthismethodisnomorethan3′whiletherotationanglesofthreeaxesarewithinacertainrange.
简介:随着新型的电子器件向着"轻、薄、短、小"的方向快速发展,人们迫切地需要微型功率源。微型超级电容器因其长使用寿命、快速充放电、功率密度高、安全运行等特点在各个领域中得到了越来越广泛的应用。与传统电极二维平面结构相比,三维结构因在离子传输过程中提供了更短的扩散路径和较小的阻力而具有更加优异的性能,三维结构还可以通过创建多孔结构和有效利用有限的空间来提高能量密度的两倍,因此3D微型超级电容器的研究受到广泛关注。本文综述了直接墨水书写的3D打印方法制备微型超级电容器的进展,包括基本原理、氧化石墨烯基墨水的设计和制备、3D微型超级电容器的制作。最后,展望了3D打印微型超级电容器未来的发展趋势和挑战。
简介:介绍了双截断排放API6D平板闸阀的结构、主要特征、双截断排放阀座的工作原理及阀门设计.
简介:Anovelno-guidelightpentype3D-coordinatemeasurementsystemwiththreesetsofpositionsensitivedevices(PSDs)torealizeintersectionconvergeinagingisintroduced.Itiscalledasthelightpentypemeasurementsystem,becausethemeasuringheadisshapedasapenwithseverallightsourcesonit.Thestructuredesign,measurementprincipleandexperimentalresultsarepresented.Thetheoreticalanalysisandexperimentalresultsprovethatthissystemhasadvancedfeaturesofsimplestructure,highautomation,andhighaccuracy,andcanbeusedinthemeasurementfieldsofmechanicalmanufacture,robot,auto,aviationandmedicineeffectively.