简介：千万别想太多,你接下来将要看到的绝对不是围绕好莱坞大片《2012》里的情节如何如何不远了的无聊八卦,汽车或者说新车才是这本杂志永远的核心。当然我也从来没入过也从来没打算加入标题党,我要说的是计划于2012年前后上市销售的电动车真的已经离我们很近很近了,比如我刚刚在桂林的2010奥迪科技日上零距离接触过的e-tron和Q5HFC。

简介：ApyrotechnicallypumpedNdglasslaserisdemonstratedbytheuseofpyrotechnicflashlampscomposedofseveralchemicalmaterialsarrangedinastableplaneconcaveresonatorcavity.Theflashlampwasmadeofchemicalmixturewithoxidant,fuel,andbinder.TheemissionspectrumofpyrotechnicflamecoveredmostoftheabsorptionbandsofNd~(3+)inphosphateglass.Under4.56-gchemicalmixturepumping,longpulseoutputpowerofabout5.5Wwasachieved.

简介：Theoreticalanalysisoftheelectromagneticfielddistributioninthefocalregionofalongmetallicparabolicreflectorthathasitssurfacecoveredwithamagnetizedplasmalayerisderived.Theincidentwaveisconsideredtobewithageneralobliqueincidenceforbothparallelandperpendicularpolarizations.TheelectromagneticfieldintensityexpressionsalongthefocalregionareobtainedaccuratelyusingMaslov’smethod.Theeffectsofplasmathicknessonthereflectedandtransmittedfielddistributionsareinvestigated.Theeffectsofotherphysicalparameterssuchastheangleofincidenceandtheplasmaandcyclotronfrequenciesonthetransmittedfieldintensitydistributionalongthefocalregionarealsostudied.TheresultsobtainedbyMaslov’smethodandKirchhoff’sapproximationarefoundtobeinagoodagreement.

简介：Real-timevideostreamingusingultra-wideband(UWB)technologyisexperimentallydemonstratedalonglong-reachpassiveopticalnetworks(LR-PONs)withdifferentwiredandwirelessreaches.ExperimentaltestsusingexternalanddirectmodulationwithUWBwirelessradiationinthe10-and60-GHzbandsareperformed.Anultra-bendablefiberisalsoconsideredforalast-miledistribution.ThevideoqualityattheoutputoftheopticalfiberinfrastructureoftheLR-PONisassessedusingtheerrorvectormagnitude(EVM),andthelinkqualityindicator(LQI)isusedasafigureofmeritafterwirelessradiation.AnEVMbelow–17dBisachievedforbothexternallyanddirectlymodulatedLR-PONscomprisingupto125kmofopticalfiber.EVMimprovementisobservedforlongerLR-PONswhendirectlymodulatedlasers(DMLs)areusedbecauseoftheamplitudegainprovidedbythecombinedeffectofdispersionandDML’schirp.Comparedwithopticalback-to-backoperation,theLQIleveldegradestothemaximumaround20%forLR-PONsrangingbetween75and125kmoffiberreachandwithawirelesscoverageof2minthe10-GHzUWBband.ThesamelevelofLQIdegradationisobservedusingthe60-GHzUWBbandwithaLR-PONintegrating101kmofaccessnetwork,alast-miledistributionusingultra-bendablefiber,anda5.2-mwirelesslink.