简介:【摘要】:随着城市建设的高速发展、城市人口大量增多、气候条件不断恶化,城市热岛效应带来的影响日益突出。采用热红外影像反演地表温度成为一种高效获取地表温度数据的有效方法。本文利用TM影像以辐射传输方程法和单窗算法分别对青岛西海岸经济新区的陆面温度进行反演,对两种方法得到的温度数据进行横向对比以检验两种反演方法的优劣性,同时对热岛效应区域变化情况进行纵向对比以总结城市热岛效应变化规律。
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.