简介:这款车是一辆全自动车,捷豹的客户可以按需叫车,这是一辆应对电动、共享、互联的未来而设计的汽车.它最特别的地方,是它的智能互联方向盘.它可以放置在你的家中,成为你最忠实的伙伴.Sayer是第一款用语音启动的人工智能方向盘,它可以执行多项任务,这是以E-type设计者的名字来命名的.它可以用来叫车、播放音乐、餐厅定位,它甚至可以知道你的冰箱里有什么.你可以加入提供按需叫车服务的俱乐部,一旦成为了它的成员,可以独享一辆车,也可以与同一社区的他人分享一辆车,而且用户并不需要把车停在家里,只要把方向盘放在家里就可以了.
简介:WepresentaHerriott-typemultipasslaserabsorptionspectrometerenhancedbyopticalheterodynedetection.Theproposalisdemonstratedbymeasuringthespectraofwatervapormoleculeintheregionfrom12247.6873to12249.6954cm-1.Comparedwithdirectabsorptionspectroscopy,thesignal-to-noiseratioisimprovednearlyonemagnitudeoffactorbycombiningwiththeopticalheterodynespectroscopyandextraweakabsorptionlinesareobserved.Theminimumdetectableabsorptionisestimatedat4.36×10-8cm-1andthemeasuredlineshapedominatedbyDopplerbroadeningcanbepreciselyrecoveredbydirecttransformationofexperimentalopticalheterodynespectralprofile.
简介:Thetraditionalproportionalsolenoidhasdisadvantages,suchasbigsizeanddifficultyremoving.Sothispaperintroducesanewtypeofbi-directionalproportionalsolenoid,andexpoundsthestructureandworkingprincipleindetail.Onthisbasis,themathematicalmodeloftheproportionalsolenoidisestablished,anditsoutputcharacteristicisanalyzedbythefiniteelementtoolAnsoft/Maxwell.Itsstructureparameters'influenceontheoutputcharacteristicalsoisdiscussedthroughtheelectromagneticfieldanalysis.Thesimulationresultsshowthatthisnewtypeofbi-directionalproportionalsolenoidcanobtainagoodstaticcharacteristicwithoutthesamemagneticcircuitcontrolofthetraditionalproportionalsolenoid.
简介:WeanalyzetherandomdisturbanceinthetransmissionoflightthroughaspinningGlan-Thompsontypeprismpolarizer.ThedisturbancemakesthedependenceofthetransmissionontherotationanglesignificantlydeviatesfromtheMaluscosine-squaredlawandseverelyspoilstheoutputlightquality.Slightvibrationofthepolarizerasitrotatescombingthemulti-beam-interferenceeffectraisesthedisturbance.Furtheranalysisrevealsthesensitivedependenceofthedisturbanceonthecomposingmaterialoftheprismgap,andtheappropriateselectionofsuchmaterialcanmakethedisturbanceminimizetoverydesirablelevels.Themodelresultsshowquitegoodagreementwithexperiments.
简介:Anovelno-guidelightpentype3D-coordinatemeasurementsystemwiththreesetsofpositionsensitivedevices(PSDs)torealizeintersectionconvergeinagingisintroduced.Itiscalledasthelightpentypemeasurementsystem,becausethemeasuringheadisshapedasapenwithseverallightsourcesonit.Thestructuredesign,measurementprincipleandexperimentalresultsarepresented.Thetheoreticalanalysisandexperimentalresultsprovethatthissystemhasadvancedfeaturesofsimplestructure,highautomation,andhighaccuracy,andcanbeusedinthemeasurementfieldsofmechanicalmanufacture,robot,auto,aviationandmedicineeffectively.
简介:Adouble-slitghostinterferenceexperimentperformedonanentangledresourceusingtype-IInon-collineardegeneratespontaneousparametricdown-conversion(SPDC)isdemonstrated.Theinfluenceofthedistancebetweenthedouble-slitandthebucketdetectorprecededbyapinholeisstudied.Theexperimentalresultsshowthattheinterferencefringesbecomeincreasinglydistinctwithhighervisibilitywhenthepinhole-double-slitdistanceincreases.Afirst-orderclassicaltheorybasedontheKlyshko’stwo-photonadvanced-wavepicture,andasecond-orderquantum-imagetheoryareprovidedforexplanations.Thefittingresultsindicatethatthedivergenceoftheconvertedfluorescencesignificantlyaffectstheghostfringes.
简介:Theeffectofλ/2SiO2overcoatonthelaserdamagecharacteristicsofHfO2/SiO2high-reflector(HR)coatingsisinvestigatedwith1-on-1andN-on-1laserdamagetestmethods.Thelaserdamagesurfaceof1-on-1isanalyzedbyastepanalyzer.ThesurfacemorphologiesshowthatlaserdamagemakesthecoatingdamagedareaprotrudentandroughforHRcoatingwithoutλ/2silicaovercoat,butconcaveandsmoothforHRcoatingwithλ/2silicaovercoat.Theresultof10-on-1multi-pulseirradiationonthesamepointofthecoatingshowsthatthereisanenergydensitystageonthedamagecurve.Ifthelaserenergydensityiswithintherangeofthestage,HfO2/SiO2HRcoatingswithλ/2silicaovercoatwillnotbedamagedmorethan2timesformulti-shots,andthesurfacedamagesareveryslightsothatthereisnoimpactonthecoatingperformance.Anotherinterestingresultisthattheenergydensitystageextendsfromthedamagethresholdtothepointofabout3timesofthreshold,whichissimilartotheeffectofthelaserconditiononcoating.
简介:基因同样源自赛道基因向经典致敬保时捷718BoxsterS与上一代最明显的差异,自然是在车尾首次挂上了“718”的头衔.相比保时捷911,可能大家对“718”有点陌生,这是一款以保时捷经典车型550Spyder为基础衍生出的赛车专用车型,采用了中置双座敞篷设定,且发动机盖下搭载了一台1.5升四缸发动机.所以全新718BoxsterS也传承了718经典的中置敞篷搭配四缸动力的设计.718在1957~1962年间活跃于各大赛场,并且多次夺得优异的成绩.其中,亮相第二年便拿下了勒芒24小时耐力赛的冠军与季军.1959年,718还斩获了TargaFlorio赛事的总冠军,此后的911Targa车型之名便来源于此.最后甚至被改装为单座配置,并代表保时捷出战二级方程式大赛.因此对于保时捷来说“718”并不仅仅是一串数字或一部车款,“718”所代表的是保时捷勇往直前的运动精神.
简介:THENEWCARCHALLENGE新上市的宝马5系固然很棒,但你们不觉得这类车型越来越中庸,越来越无聊了吗?对于骨子里是个不安分的人来说,花差不多的钱绝对会选择辣味十足的钢炮,比如今天对决的这两款.自我介绍高尔夫家族最最强悍的车型思域家族最最强悍的车型亮点已经是最快的“神车”了,还需要别的亮点吗在人人都以刷纽博格林赛道纪录为荣的当下,我们吃不准新思域TypeR是不是最快量产前驱者纪录的创造者或者保持者,只知道它的成绩是7分43.8秒.
简介:Thenonlinearswitchingcharacteristicsoffusedfiberdirectionalcouplerswerestudiedexperimentally.Byusingfemtosecondlaserpulseswithpulsewidthof100fsandwavelengthofabout1550nmfromasystemofTi:sapphirelaserandopticalparametricamplifier(OPA),thenonlinearswitchingpropertiesofanullcoupleranda100%couplerweremeasured.Theexperimentalresultswerecoincidentwiththesimulationsbasedonnonlinearpropagationequationsinfiberbyusingsuper-modetheory.Nonlinearlossinfiberwasalsomeasuredtogettheinjectedpoweratthecoupler.Afterdeductingthenonlinearlossandinputefficiency,thenonlinearswitchingcriticalpeakpowersfora100%andanullfusedcouplerswerecalculatedtobe9410and9440W,respectively.ThenonlinearlossparameterPNinanexpressionofαNL=αP/PNwasobtainedtobePN=0.23W.
简介:自我介绍阿尔法·罗密欧家族目前唯一在销售的后驱四门轿车目前在销售的最小的四门捷豹轿车亮点性感的造型、性感的设计、性感的气质,对于中国消费者来说非常具有吸引力的品牌全铝合金车体、动感的造型、浓浓的英伦风味动力低功率版2.0T汽油机能输出200马力,峰值扭矩为330牛·米;高功率版2.0T汽油机能输出280马力,峰值扭矩为400牛·米;具有法拉利血统的2.9升V6涡轮增压汽油机的最大功率达到了510马力,峰值扭矩达到了惊人的600牛·米.所有发动机均与手自一体8挡变速箱匹配