简介：Theclosephotogrammetric3-Dcoordinatemeasurementisanewmeasuringtechnologyinthefieldsofthecoordinatemeasurementmachine(CMM)inrecentyears.Inthismethod,weusuallyplacesometargetsonthemeasuredobjectandtakeimageoftargetstodeterminetheobjectcoordinate.Thesubpixellocationoftargetimageplaysanimportantroleinhighaccuracy3-Dcoordinatemeasuringprocedure.Inthispaper,somesubpixellocationmethodsarereviewedandsomefactorswhichaffectlocationprecisionareanalyzed.Thenweproposebilinearinterpolationcentroidalgorithm.Theexperimentshaveshownthisalgorithmcanimproveaccuracyoftargetcentroidbyincreasingavailablepixels.

简介：丹麦国家电信局在2001年成功颁发了4张许可证建立和运营3G移动网络。2005年1月31日，TeliaSonera收购了丹麦的Orange，四张许可证中的一张交还给丹麦国家电信局（NITA）。

简介：Byusingthecenterprojectionimagesequencetoestimate3-Dmotionparameters,oneneedstoknowthecorrespondingrelationshipbetweenthefeatureofmotionobjectinspaceandtheprojectioncoordinateonimageplane.Inordertoavoidusingtherelationshipoffeaturecorrespondence,thetensoranalysismethodintheaffinetransformationsystemispresented,andthesimulationdataofexperimentalresultsaregiven.

简介：<正>刚刚在深圳会展中心落幕的2013中国3D打印(增材制造)产业发展与应用技术高峰论坛上,东道主深圳提出了一个响亮的口号:作为高新技术产业前沿的深圳,具备技术路径与市场需求上的优势,不能在3D打印产业激流中落人之后。3D打印前景为什么诱人?原因只有一个,3D打印最有

简介：Thispaperpresentsahandheld3Dvision-basedscannerforsmallobjectsbyusingKinect.Itisdifferentfromthepreviouscolor-glove-basedapproacheswhichrequiresegmentingthetargetobject.First,weeliminatethenoisesandtheoutlierscausedbyholdinghands.Second,weapplyKinect-fusionalgorithmandtruncatedsigneddistancefunction(TSDF)torepresent3Dsurfaces.Third,weproposeamodifiedintegrationstrategytoeliminatethehandeffect.Fourth,wetakeadvantageoftheparallelcomputationofGPUsforreal-timeoperation.Themajorcontributionsofthispaperare(1)theregistrationprecisionisimproved,(2)theofflineamendmentandloopclosureoperationarenotrequired,and(3)concave3Dobjectreconstructionisfeasible.IndexTermsHandheld3Dscanning,Kinect-fusion,Truncatedsigneddistancefunction(TSDF).1.IntroductionRecently,thesensor-based3Dmodelreconstructionmethodshavebeenproposed[1].Thesensordeviceshavedifferentpropertiessothatthe3Dreconstructionalgorithmsvaryaccordingly.Thecommonlyusedsensordevicesaretime-of-flight(ToF)cameras[2]-[4],laserscanners[5],andstructuredlightscanners[6],[7].Lasershavegainedareputationforaccuracy;however,caremustbetakentouseeye-safelaserswhenoperatinginproximitytohumans.Foraninteractivesystem,thestructuredlightscannerwhichisbasicallyapassivevision-basedsensordeviceissuperiorbecauseitprovidesa2DdepthimageperframeandismoreaccuratethanthatofaToFcamera.Here,wepresentareal-time3DscannerusingthedepthimagescapturedbyKinect.

简介：Micro-structures3-Dprofilemeasurementisanimportantmeasurementcontentforresearchonmicro-machiningandcharacterizationofmicro-dimension.Inthispaper,anewmethodinvolved2-Dstructuretemplate,whichguidesphaseunwrapping,isproposedbasedonphase-shiftingmicroscopicinterferometry.Itisfitnotonlyforstaticmeasurement,butalsofordynamicmeasurement,especiallyformotionofMEMSdevices.3-Dprofileofactivecombofmicro-resonatorisobtainedbyusingthemethod.Thetheoreticprecisioninout-of-planedirectionisbetterthan0.5nm.Thein-planetheoreticprecisioninmicro-structuresisbetterthan0.5μm.Butattheedgeofmicro-structures,itisonthelevelofmicrometermainlycausedbyimpreciseedgeanalysis.Finally,itsdisadvantagesandthefollowingdevelopmentarediscussed.

简介：<正>据悉,能够提供无线上网业务和多媒体业务的第三代移动通信系统(简称3G)将于2003年走向商用化道路。这将是一个更有"钱"景的市场,根据专家预测,2010年的市场规模将达到10000亿人民币。国家863计划通信高技术研究十周年高级研讨会上的消息称,国家重大研究开发项

简介：新不圆表面描准前为光天线的透镜系统三维(3D)激光雷达的成像被不圆表面的光设计软件CODE-V.Four类型最佳地设计了并且模仿球形的透镜球形，椭圆，双曲线，和抛物线是researched.The光系统，包括椭圆的柱体透镜描准和光天线，能被认识到为点来源半导体las的不到5rad描准角度

简介：<正>随着今年2月份奥巴马在国会上呼吁要注意发展3D打印,相关概念股即开始兴风作浪,A股也跟风炒作。这个蕴含着无限的科技含量以及想象空间的技术,从诞生之日起就注定不那么平凡3D打印经过10多年的孕育,已经初具规模。从资本市场看,美国3DSystems估值高达250多倍,风头正盛。而国内3D打印产业刚有苗头,尚未形成产业链

简介：AnalysysIntemationaJ预测，PTT（push-to-talk）将成为新的3G应用热点，2009年的用户数将达到800万。

简介：Organicmultiplequantumwells(OMQWs)consistingofalternatinglayersoforganicmaterialshavebeenfabricatedfromtris(8-hdroxyquinoline)aluminum(Alq)and2-(4-biphenylyl)-5-(4-tertbutylphenyl)-1,3,3-oxadiazole(PBD)byamultisource-typehigh-vacuumorganicmoleculardeposition.Fromthesmall-angleX-raydiffractionpatternsofAlq/PBDOMQWs,aperiodicallylayeredstructureisconfirmedthroughtheentirestack.TheAlqlayerthicknessintheOMQWswasvariedfrom1nmto4nm.Fromtheopticalaborption,photoluminescenceandelectroluminescencemeasurements,itisfoundthattheexcitonenergyshiftstohigherenergywithdecreasingAlqlayerthickness,ThechangesoftheexcitonenergycouldbeinterpretedastheconfinementeffectsofexcitonintheAlqthinlayers.Narrowingoftheemissionspectrumhasalsobeenobservedfortheelectroluminescentdevices(ELDs)withtheOMQWsstructureatroomtemperature.

简介：摘要教师是课堂教学的主要设计者，也是实现高效课堂教学的关键角色，因此在日常的教育教学的过程中需要结合课堂教学的实际任务，以学生为根本，以营造良好的课堂学习氛围和打造高效的课堂教学为目的，进而激活课堂氛围，以教师的教学情感为基础促进教育教学水平的提升。本文以情感教学为基础，分析以情促学和激活课堂的有效策略，为打造高效的知识课堂建设而不断努力。

简介：摘要高等职业教育作为我国高等教育体系中的重要组成部分，为我国的现代化建设培养出了众多的高水平技能型人才，提升了我国劳动力的整体素质，随着我国高等职业教育重要性的不断提升，高等职业院校的数量也愈来愈多，学生培养规模也与日俱增，为我国经济社会的快速发展提供了源源不断的后备军。

简介：摘要随着科学技术的迅猛发展，互联网技术应用于社会生活的方方面面，为社会的发展做出重大贡献。物联网是互联网大范围下的一个网络概念，物联网在应用中会产生大量的数据信息，这些数据信息的处理需要云计算支持，云计算便是在这样的环境中产生的，并且云计算的出现保障了物联网的应用和发展，本次研究主要讨论云计算在物联网中的具体应用，从物联网以及云计算的概述出发，总结云计算的优点，探讨将云计算融入物联网中的技术应用，结合目前云计算与物联网的应用实例，找出云计算技术对于物联网的作用，更好地促进物联网的开拓发展。

简介：

简介：Satisfactoryresultscannotbeobtainedwhenthreedimensional(3D)targetswithcomplexmaneuveringcharacteristicsaretrackedbythecommonlyusedtwo-dimensionalcoordinatedturn(2DCT)model.Toaddresstheproblemof3Dtargettrackingwithstrongmaneuverability,onthebasisofthemodifiedthree-dimensionalvariableturn(3DVT)model,anadaptivetrackingalgorithmisproposedbycombiningwiththecubatureKalmanfilter(CKF)inthispaper.Throughideologyofreal-timeidentification,theparametersofthemodelarechangedtoadjustthestatetransitionmatrixandthestatenoisecovariancematrix.Therefore,statesofthetargetarematchedinreal-timetoachievethepurposeofadaptivetracking.Finally,foursimulationsareanalyzedindifferentsettingsbytheMonteCarlomethod.Allresultsshowthattheproposedalgorithmcanupdateparametersofthemodelandidentifymotioncharacteristicsinreal-timewhentargetstrackingalsohasabettertrackingaccuracy.

简介：日前，信产部宣布颁布了3G可视手机的行业标准。不过，目前这项标准并非强制性标准。

简介：<正>平板显示行业一位资深人士近日透露,中国液晶面板进口关税今年将由3%提高至5%,只是尚未正式公布。

简介：Asimplifiedthree-dimension(3D)fadingchannelmodeldeployedinamulti-inputmulti-output(MIMO)beamformingsystemisexploredinthisarticle.Bothangleofarrival(AoA)andangleofdeparture(AoD)whichimpacttheoverallsystemperformanceareexamined.Thenumericalresultsaregivenforvalidatingtheaccuracyofthetheoreticalderivedformulas.Furthermore,theperformancesofthemodelwithdifferentnumberoftransmittersandreceiversarestudiedandcompared.TheincrementinAoAparametersdefinitelygeneratestheimpactofthesystemperformancewhentheconsiderationofsimplified3Dchannels.

简介：Thetemperaturedependenceofcharacteristicsformultimodeinterference(MMI)based3-dBcouplerinsilicon-on-insulatorisanalyzed,whichoriginatesfromtherelativelyhighthermo-opticcoefficientofsilicon.Forrestrictedinterference3-dBMMIcoupler,theoutputpoweruniformityisideally0atroomtemperatureandbecomes0.32dBwhentemperaturerisesupto550K.Forsymmetricinterference3-dBMMIcoupler,thepoweruniformitykeepsideally0duetoitsintrinsicsymmetricinterferencemechanism.Withthetemperaturerising,theexcesslossofthebothdevicesincreases.TheperformancedeteriorationduetotemperaturevarietyismoreobvioustorestrictedinterferenceMMI3-dBcoupler,comparingwiththatofsymmetricinterferenceMMI3-dBcoupler.