简介:Numericalestimatesforelectronsandmesonsparticle–antiparticlecreationfromvacuuminthepresenceofstrongelectromagneticfieldsarederived,usingthecompleteprobabilitydensityrelationofPopov’simaginarytimemethod(Popov,JETPLett.13,185(1971);Sov.Phys.JETP34,709(1972);Sov.Phys.JETP35,659(1972);PopovandMarinov,Sov.J.Nucl.Phys.16,449(1973);JETPLett.18,255(1974);Sov.J.Nucl.Phys.19,584(1974));(Popov,Phys.Let.A298,83(2002)),andwithintheframeworkofanexperimentalsetupliketheE144(Burkeetal.,Phys.Rev.Lett.79,1626(1997)).Theexistenceofcrossingpointamongpaircreationefficiencycurvesofdifferentphotonenergiesandtheroleofodd/evenmultiphotonordersintheproductionratesarediscussed.Finallyakindoftunabilityprocessbetweenthetwocreationprocessesisdiscussed.
简介:大众Budd-e概念车是一辆零排放的电动车,它让人见识到未来电动车的进化趋势.尽可能多的互联是未来汽车最大的特征之一,不仅是汽车与周围环境、汽车与汽车之间的互联,更是汽车与家里、工作场所的互联.开关和按键早已成明日黄花,取而代之的是触摸和手势控制,显示屏也有所革新,更多采用大尺寸的独立显示屏嵌入仪表板的方式.大众Budd-e概念车最大的一项突破是首度采用了模块化电动驾驶平台(ModularElectricDriveKit),此平台专门针对电动车的车体结构、内饰配置、操控特性等而开发,并且移除传统汽油车必须搭载的零组件,以创造出宽敞的内舱空间.
简介:Itisidentifiedthatbarelypassingelectronsarethedriveofthee-Gshbones,ratherthanthebarelytrappedelectronsatlowfrequency.Thefrequencyjumpine-Bshboneexperimentsisreproducedandanalyzed.Itisfoundthatthee-Bshbonefrequencyincreaseswiththehotelectronenergy,whichisconsistentwiththeexperiments.Thegrowthrateofthemode(m=2,n=2)isgreaterthanthatofthemode(m=1,n=1).