简介：

简介：

简介：

简介：通过2003年互联网对重大事件报道所产生的广泛的社会效应．以及2004年年初，三大门户网站发布的赢利财报．一系列数据都突出了互联网作为传播媒介的巨大影响力。

简介：

简介：Theopticalparametersforthreesamplesofintrinsic,dopedSianddopedMg（AlxGa1-x)yIn1-yPpreparedbytheMOCVDonGaAssubstrateweremeasuredbyusingellipsometryandwerecalculatedbythetwo-layerabsorptionfilmmodel.Theresultsobtainedwerediscussed.Thegrownratesandthicknessofoxidiclayerontheintrinsic（AlxGa1-x)yIn1-yPsurfaceexposedintheatmospherewerestudied.Alineardependenceofoxidiclayerthicknessonthetimewasobtained.

简介：已经有130多年历史的柯尼卡公司和70多年历史的美能达公司从2003年的秋天开始逐渐淡出人们的视野，真正成为“历史”，取而代之的是两者的“合壁”柯尼卡美能达(kenihminolta)。自今年1月发表经营合并以来，经过5月份股份交换合同的签定、6月份股东大会上对股份交换合同的表决认可，在8月5日通过交换股份方式实施了经营合并，10月1日实施了集团内事业的整合，日本柯尼卡株式会社和美能达株式会社的合并重组终于尘埃落定。

简介：RamanscatteringspectroscopyisappliedtoinvestigatethephononmodesinGaxIn1-xP(x=0.52)and(AlxGa1-x)0.51In0.49P(x=0.29)alloys.Two-modebehaviorinGaxIn1-xPandthree-modebehaviorin(AlxGa1-x)0.51In0.49Pareobserved.InorderedGaxIn1-xP,weclearlydistinguishtheTO1(GaP-like)modeandthesplittingofLO1(GaP-like)andLO2(InP-like)modes,whichisbelievedtobetheresultofsuperlatticeeffectofordering,andtheLO1+LO2mode,whichisobservedforthefirsttime.Inadditiontotheb/aratio,it'sfoundthattherelativeintensityoftheFLAandtheLO1+LO2modesalsocorrespondstothedegreeoforder.TheTO1andthesplittingofLO1andLO2devotetogethertothereductionofthe'valleydepth'.In(AlxGa1-x)0.51In0.49P,thedoublingofFLAisobserved.DuetotheinfluenceofAlcomposition,theGaP-likeLOmodebecomesashoulderoftheInP-likeLOmode.TheunresolvedRamanspectraindicatetheexistenceoforderedstructurein(AlxGa1-x)0.51In0.49Palloys.

简介：ITU无线电通信全会，考虑到：a）无线电通信全会的任务和职能规定于组织法第13条和ITU公约第8条；

简介：Basedonthewhiteningpropertyofwavelettransformationfor1/fnoise,thispaperaddressestheproblemofdetectingdeterministicsignalsinthepresenceof1/ffractalnoise.Thetransferfunctionofwhiteningfilterisprovidedaswellastheconditionforwhitening.ThereceiverstructurebasedonKarhunen-Loeveexpansionandthedecisionrulearealsogiven.Finallyperformanceofthedetectorisanalyzed.

简介：Amethodforimageencryptionusinga1-Djointtransformcorrelatorisdescribed.Byuseoflinefunctions,a2-Dobjectisencryptedfirstinonedirection,thenintheperpendiculardirection.Theprincipleofthemethodandexperimentalresultsaregiven.

简介：Zinchasbeendiffusedinton-typeInxGa1-xAs,InPandGaAsinclosedam-poules,andtheexperimentaldataforInxGa1-xAsrarelyreportedpreviouslyhavebeenob-tained,TheoreticallythelinearrelationsipbetweenlogarithmicdiffusioncoefficientlnDandthecompositionxhasbeendemonstrated,whichisingoodagreementwiththeexperimentalresults.ThecalculateddiffusionjunctiondepthforInGaAsbasedonthediffusionmodelinwhichD^∝c^2isassumedalsoagreeswellwiththatoftheexperment,Finallytheoveralldiffusiontimeinamultiayerheterostructurewasapproximatedast=(∑√-ti）^2.

简介：互联网公司又悄悄地杀回来了，以一种更谦卑的姿态。他们不再到处举办Party或者发布会，不再为签下一单而兴奋，而是向投资者或合作伙伴强调它们的脚踏实地，强调他们的销售额。它们的财务报表越来越好看，它们的业务越来越精湛。

简介：本文叙述了660MW中间再热机组强制循环汽包炉的炉本体采用盐酸清洗、采用磷酸和多聚磷酸盐进行漂洗钝化的清洗工艺方法.其特点在于:为减缓金属腐蚀,必需严格控制清洗工艺配方.通过缓蚀剂对比小型试验探索出:在酸洗配方和水冲洗过程中,添加适量的异抗坏血酸钠还原剂可以抑制三价铁离子对金属的腐蚀,并可避免因水冲洗时间过长而产生二次锈蚀.该工艺实际应用后效果良好,金属腐蚀速率及腐蚀总量均显著小于(DL/T794-2001)所规定的标准.该工艺还探索出:在酸洗和酸洗后的冲洗水中添加异抗坏血酸钠后,能够有效抑制三价铁离子的腐蚀危害,并减少二次锈蚀的产生.

简介：

简介：TheinvestigationonopticalpropertiesofSi1-xGex/Sistrainedlayerstructureshasbeencarriedoutactivelyinrecentyears.Thephotoluminescencehasbe-comeabriskersubjectinthestudiesofitsvariousopticalproperties.Aresearchdevelop-menttophotoluminescencepropertiesofsomenewSi1-xGex/Sistrainedlayerstruc-turesisintroduced.

简介：1xEV—DO的特点分析1xEV—DO是CDMA2000标准系列中专门提供高速分组数据业务的无线标准通信技术。与CDMA20001X相比，1xEV—DO技术具有如下特点：

简介：自从专业单反数码相机问世以来，摄影师们可以不像过去那样既揽技术活，又背着沉重的摄影器材干“体力”活了。今天，科技的发展使专业数码成像变得既便捷又精美。

简介：二层的结构由PS/PMMA-DR1合成电影组成多孔的硅cladding层上的平面波导层在我们的实验被制作。导致的栅栏被二根NdYAG激光横梁的相互作用在多孔的silicon/PMMA-DR1波导在1064nm基于第三个非线性的光性质形成。第一份订单的衍射效率使衍射光被测量是大约0.2%全部的输出。

简介：Thesubbandstructures,distributionsofelectronandholewavefunctions,statedensity,opticalgainspectra,andtransparencycarrierdensityoftheV-grooveZn1-xCdxSe/ZnSequantumwiresareinvestigatedtheoreticallyusingfourbandeffective-massHamiltonian,whichtakesintoaccounttheeffectsofthevalencebandanisotropyandthebandmixing.Thebiaxialstraineffectforquantumwiresisincludedinthecalculation.ThecompressivestrainintheZn1-xCdxSewireregionincreasestheenergyseparationbetweentheuppermostsubbands.Theopticalgainwithxy-polarizedlightisenhanced,whileopticalgainwithz-polarizedlightisstronglydecreased.Thexy-polarizedopticalgainspectrumhasapeakataround2.541Ev,withthetransparencycarrierdensityof0.75×1018　cm-3.Thecalculatedresultsalsoshowthatthestraintendstoincreasethequantumconfinementandenhancetheanisotropyoftheopticaltransitions.