简介:Areviewontheprogressofpowerful2μmsilicafibersourcesinpastdecadesispresented.Wereviewthestate-of-the-artrecordsandrepresentativeachievementsof2μmhigh-average-powercontinuouswave,pulsedfiberlasersandamplifiers,andpowerfulsuperfluorescentsources.Challengeswhichlimitthefurtherpowerscalingof2μmsilicafibersourcesarediscussed,includingpumpingbrightnesslimitation,thermalproblem,andnonlineareffects.Potentialandpromisingroadmapstogobeyondtheselimitations,liketandempumpingandbeamcombining,arediscussed.Prospectsofpowerful2μmsilicafibersourcesarealsopresentedintheendofpaper.
简介:TheproblemsofcharacteristicpolynomialassignmentinFomasini-Marchesini(F-M)modelⅡof2-Dsystemsareinvestigated.Thecorrespondingclosed-loopsystemsdescribedbyF-MmodelIIareobtainedviathestatefeedback.Usingthealgebraicgeometrymethod,thecharacteristicpolynomialassignmentinthedosed-loopsystemsisdiscussed.Intermsofthetheoryofalgebraicgeometry,theproblemofcharacteristicpolynomialassignmentistransferredtotheonewhetherarationalmappingisonto.SufficientconditionsforalmostarbitraryassignmentcoefficientsofcharacteristicpolynomialinF-MmodelⅡof2-Dsystemsviastatefeedbackarederived,andtheyareavailableformulti-inputcases.Italsohasbeenshownthatthismethodcanbeappliedtoassignthecharacteristicpolynomialwithoutputfeedback.Thesufficientconditionsforalmostarbitraryassignmentcoefficientsofcharacteristicpolynomialofmulti-input2-DsystemsdescribedbyF-MmodelⅡwithoutputfeedbackareestablished.
简介:Muellermatrixelementsarepresentedrepresentingscatterto90°fromanincidentpolarizedlaserbeam.Thecasedsconsideredincludefiveparticlesizes(suchas1.24μm,0.494μm,0.36μm,0.123μm,and0.065μm),twconcentrations(suchas0.0025%and0.005%byvolume),andthreedetectordepths(suchas0,1.5cm,and3cmintothescateringvolume).Ifthemagnitudesoftheelementscanberoundedofftothenearest0.01,aparticlesizedependenceisdescribedbytheresultingaveragematrices,whichisonlytwomatricesford>0.22μmandd<0.22μmwhicharenonsingularandasymmetric,respectively.
简介:随着晶片封装技术的不断发展,要求基板线路的精细度越来越高,50μm/50μm以下的COF(ChiponFlex)精细线路将成为未来发展的主流,但精细线路的制作一直是FPC生产上的难点,当线路在50μm/50μm以下时,成品率较低难以满足量产化的要求。本文中以公司的现有设备为基础,通过传统片式生产线,选用12μm铜箔作为基材、15μm干膜作为抗蚀层,使用玻璃菲林进行图形转移,同时通过表面处理、改变曝光、显影和蚀刻参数等,对30μm/25μm的精细线路进行研制,并通过金相切片测试仪、三次元测试仪、AOI(AutomaticOpticalInspector)等对产品进行检查。结果显示,线宽、蚀刻系数和成品率都能达到小批量生产的要求。
简介:M22,乃指沃尔夫冈·阿马德乌斯·莫扎特一生之中创作的(完成了或未完成的)音乐戏剧作品合共二十二部。2006年适逢这位史上最伟大也最著名的音乐天才诞辰250周年,在他的家乡奥地利萨尔斯堡,