简介：对邯郸和邢台地区的ETM^＋图像进行几何校正、融合、镶嵌等处理后，选取ETM^＋的B7、B4、B3波段进行假彩色合成，获得该区域1：10万的遥感影像图。对不同地层的影像特征进行分析，结合野外踏勘，建立了各地层的遥感解译标志。采用人机交互的解译方法，对邯郸和邢台地区的地层进行解译，获取各地层的分布状况。经野外验证，遥感解译成果与实际情况基本吻合，解译精度较高。

简介：“佛界-西藏壁画展”暨“巴定记忆-西藏乡村风情摄影展”在北京摄影艺术展览馆开幕，此次展览展出了西藏著名摄影艺术家高志勇八十多幅壁画摄影作品和八十多幅西藏乡村人文景观摄影作品。

简介：摘要本文提出了一种基于局部自动搜索和光谱匹配技术的训练样本纯化的BP网络分类方法。利用影像的空间信息在图像局部范围内自动搜索和选择最佳样区位置，再用光谱匹配对寻找到的最佳样区在光谱空间上进一步纯化。从空间和光谱两个角度对样区进行了纯化，使得训练样本更适合遥感图像分类的要求，最后利用BP网络对遥感图像进行分类。实验结果证明，原始遥感图像经过样区纯化算法处理后，目视判读效果和数值分析都表明提高了分类精度。

简介：为研究HJ-1CCD影像在土地利用中的应用能力,以HJ-1A/BCCD数据和LandsatETM＋数据为数据源,在对其进行一系列数据预处理的基础上,分别从遥感影像土地利用要素识别能力、土地利用计算机分类的精度、土地利用信息提取二级分类精度和土地利用分类各地类面积对比等几个方面,对HJ-1A/BCCD数据和LandsatETM＋数据在土地利用分类中的应用能力进行对比研究,得出了在土地利用分类应用中,HJ-1A/BCCD数据基本可以替代LandsatETM＋数据,而且HJ-1A/BCCD数据光谱敏感性更强,反应地物细节的能力更强,比LandsatETM＋数据更有优势的结论。

简介：Inthisworkpulsegenerationinboththe1.5and2μmspectralrangesusingagrapheneoxide(GO)-paper-basedsaturableabsorberinEr-andTm-dopedfiberlasersispresented.ThearticledescribesthefabricationmethodofGOpaperanditscharacterization.Theperformanceofbothlasersisdiscussedindetail.Stable,mode-lockedoperationprovides613fsand1.36pssolitonpulsescenteredat1565.9and1961.6nminEr-andTm-dopedfiberlasers,respectively.Furthermore,scalingofspectralwidth,andhencethepulseduration,byincreasingthenumberofGOpaperlayersintheEr-dopedlaserisdescribed.TheversatilityandsimplicityofGOpaperfabricationcombinedwiththepossibilityofscalingtheopticalspectrumfullwidthathalf-maximumareessentialfeaturesthatmakeitagoodcandidateforultrafastlow-powermode-lockedlasersoperatingindifferentspectralregions.

简介：Background:Accelerometershavebeensuggestedtoprovideadditionalinformationduringthe6-minwalktestwhichmaybeusefulinevaluatingchangesinfunctionalexercisecapacity.TheaimofthestudywastoidentifywhethertheadditionalinformationmeasuredbytheMyWellnessKey~(TM)(MWK)accelerometerduringatreadmill6-minwalktest(t-6MWT)wasrelatedtocurrentlyusedoutcomemeasures.Methods:Fifteenparticipants(9males,6females)performedaself-pacedt-6MWT.RespiratorygasanalysisandwalkingdistanceweremeasuredwhilstwearingtheMWK.Results:Asignificantcorrelationwasestablishedbetweenactivitycountsand6-minwalkdistance(6MWD)(r=-0.847,p<0.001)yetnot6-minwalkwork(6MWW)(r=-0.337,p=0.220).EnergyexpenditureestimatedbytheMWKwasstronglycorrelatedto6MWW(r=0.938,p<0.001)butnot6MWD(r=0.477,p=0.072).TheMWKsignificantlyunderestimatedenergyexpenditure(36.73,CI=33.9-39.7kcal)comparedtogasanalysis(54.35,CI=46.2-61.4kcal)demonstratingpooragreementbetweenthetwoanalyses(Bias=-17.61kcal,Limitsofagreement=-37.4,t2.2kcal).Measurementoftimespentundertakinglight,moderate,andvigorousphysicalactivitywasnotsignificantlydifferent(p>0.05)betweentheMWKandgasanalysis.Conclusion:EstimatedenergyexpenditureprovidedbytheMWKwasstronglycorrelatedto6MWW;however,MWKunderestimatedenergyexpenditureasmeasuredbygasanalysis.TheMWKmayprovideoutcomedatathatsupplementthosecurrentlyprovidedbythe6MWDforfunctionalcapacityassessmentduringthet-6MWT.

简介：LanthanidedopedNaYF4microcrystalsweresynthesizedviaafacilehydrothermalmethod.MulticolorupconversionluminescencewasobservedinNaYF4microcrystalsdopedwithYb3+/Er3+,Yb3+/Tm3+,andYb3+/Er3+/Tm3+undertheexcitationof980nminfraredlight.Importantly,theexcitationpowerdensitydependenceofupconversionemissionintensityindicatedclearlytheenergytransferfromTm3+toEr3+ionsundertheexcitationoflowpowerdensity(5×102–9×102W/cm2).Meanwhile,theinverseenergytransferfromEr3+toTm3+ionsundertheexcitationofrelativelyhigherpowerdensity(4.1×104–4.9×104W/cm2)wasalsorevealed.ThiswasadirectevidenceforreversibleenergytransferbetweenEr3+andTm3+ions.Undertheexcitationofhighpowerdensity(4.1×104–4.9×104W/cm2),darksensitizerswerealsomotivatedsothatthebottleneckeffectofhighconcentrationYb3+iondopingwasbroken.ThiswasthemainreasonforrealizinghighupconversionefficiencyofthesampleswithheavydopingofYb3+ion.

简介：Amolybdenumdisulfide（MoS2）saturableabsorberwasfabricatedbythermallydecomposingtheammoniumthiomolybdate.ByusingtheMoS2absorber,acompactdiode-pumpedpassivelyQ-switchedTm:GdVO4laserhasbeendemonstrated.AstableQ-switchedlaserwithrepetitionratesfrom25.58to48.09kHzwasachieved.Maximumaverageoutputpowerwas100mWwiththeshortestpulsedurationof0.8μs.Maximumpulseenergyis2.08μJatcenterof1902nm.

简介：2014年11月27日，索尼（中国）有限公司正式发布了α系列便携全画幅微单^TM数码相机新品α711（型号名：ILCE-7M2）。α711采用约2430万有效像素的全画幅ExmorCMOS影像传感器，并内置BIONZX影像处理器，

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简介：WithMoS2assaturableabsorber,passiveQ-switchingandQ-switchedmode-lockingoperationsofaTm-dopedcalciumlithiumniobiumgalliumgarnet（Tm:CLNGG）laserwereexperimentallydemonstrated.TheQ-switchedlaseremittedamaximumaverageoutputpowerof62mWandhighestpulseenergyof0.72μJ.Q-switchedmodelockingwasalsoobtainedintheexperiment.TheresearchresultswillopenupapplicationsofMoS2atthemid-infraredwavelength.