简介：Atunableplasmonicperfectabsorberwithatuningrangeof650nmisrealizedbyintroducinga20nmthickphase-changematerialGe2Sb2Te5layerintothemetal–dielectric–metalconfiguration.Theabsorptionattheplasmonicresonanceiskeptabove0.96acrossthewholetuningrange.Inthisworkwestudythisextraordinaryopticalresponsenumericallyandrevealthegeometricconditionswhichsupportthisphenomenon.Thisworkshowsapromisingroutetoachievetunableplasmonicdevicesformulti-bandopticalmodulation,communication,andthermalimaging.

简介：TheagingmechanismofSBSmodifiedasphaltduringitsagingprocesswasstudied.Thecharacterizationsofbaseasphalt,SBSpolymeranditsmodifiedasphaltweredeterminedindifferentagingtimebyFouriertransforminfraredspectrum(FTIR).FTIRshowsthatoxidativedehydrogenationreactionoccursinasphalt,andunsaturatedcarbonbondisgeneratedundershort-termthermalagingcondition.Additionally,SBSpolymerwasagedsignificantlyunderthatcondition,thespeedofwhichwasfasterthanthatofbaseasphalt.TheaginglawsofbothasphaltandSBSpolymerduringtheagingprocessofSBSmodifiedasphaltweresimilartotheiraginglawsrespectively.DuetotheprotectiveeffectbetweenasphaltandSBSpolymer,theagingdegreesofasphaltandSBSpolymerwerelowerthanthoseagedindependently.

简介：Thespectralcharactersofhydrocarbonsinsomeoil-bearingstrataandsoillayersoueroilandgasreservoirsintheJunggarBasinandnorthernTarimBasininXinjngarecomparedwiththoseofchemicallypurehydrocarbons.Thehydrocarbonsarecharacterizedbythebi-absorptionat2310nmand2350nm.Hydrocarbonandradioactiveanomaliesinoilandgasterrainsarefoundmuchmorewidespreadthancarbonatealterations.Basedonthespectraofheavyhydrocarbonsrelatedtooilbetween2270nmand2460nmandrefineddatatreatment,remotesensingmayholdencouragingpromiseasadirectlyprospectingtechniqueforoilandgasresources.

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简介：在这研究，我们导出温度，潮湿，和臭氧的大气的侧面，与表面放射率，皮肤温度，和表面压力一起，从在晴朗天空下面的红外线声音的发光(无云)状况。云客观地被检测用大气红外线在从在高水平的分辨率下面的中等分辨率成像分光辐射函数的相对低的空间分辨率和云面具信息下面更健全；这察觉用空格matching.Newton的非线性的物理反复的解决方案技术被进行被用于放射的转移方程(RTE)同时检索温度侧面，相对湿度侧面，和表面变量。这种技术被为温度和水蒸汽混合比率的weighting功能把特徵向量回归检索的结果用作背景侧面并且用相应反复的形式执行。反复的形式被把变化原则用于RTE获得。我们也比较了与观察的不同类型获得的检索。结果证明检索大气的发出声音的侧面由精确性和分辨率在另外的观察上有大优势。检索侧面能被用来改进数字模型的起始的条件并且在常规观察是稀少的区域使用了，例如高原，沙漠，和海。

简介：Inthiswork,Bi2Te3films(250nm)arefabricatedonSiO2/Sisubstratesbyradiofrequency(RF)magnetronsputteringatroomtemperature,andthepreparedfilmsareannealedoverthetemperaturerangeof200°Cto400°C.Crystallinityandelectricalpropertiesofthefilmscanbetunedcorrespondingly.ThepowerfactorsofBi2Te3filmsof0.85μW/K2cmto11.43μW/K2cmwereachievedafterannealing.Theinfraredreflectancemeasurementsfrom2.5μmto5.0μmdemonstratethatthereisalsoaslightred-shiftoftheplasmaoscillationfrequencyintheBi2Te3films.Bymeansofplasmoniccalculations,weattributethered-shiftofabsorptionpeakstothereductionofcarrierconcentrationandthechangeofeffectivemassofBi2Te3filmswiththeincreasedannealingtemperature.

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简介：AsimulationmethodforthethermalanalysisofInAlAs/InGaAs/InPmid--infraredquantumcascadelasers(QCLs)basedonfinite--elementmethod(FEM)ispresented.ThethermaldistributionoftheQCLsonsubstrate--sideorepilayer--sidemountingformsissimulatedandtheresultsarecompared.Resultsshowthattheepilayer--sidemountingformhasmuchbetterheatdissipationcapabilitythanthesubstrate--sidemounting.

简介：一根双横梁在红外线附近的分光计被开发在紧张补偿水吸收和仪器的飘移。分光计可以被用于单个、双的横梁大小，并且二个操作模式被比较。结果证明双横梁技术在单个横梁测量消除仪器的飘移，因此，系统的稳定性增加超过20%。水吸收上的双横梁系统的赔偿被胖内容的测量在牛奶验证。结果证明光谱数据比传统的单个横梁模式基于两倍横梁模式得到更好的刻度模型和更低的预言错误。CLC数字TH744.1-TN219-O433.1这个工作被中国(号码2004BA706B12)和天津(No.023800411)的自然科学关键基础的第10五个年计划支持。

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简介：ThispaperpresentsapreliminaryresultontheretrievalofatmosphericozoneprofilesusinganimprovedregressiontechniqueandutilizingthedatafromtheAtmosphericInfraRedSounder(AIRS),ahyper-spectralinstrumentexpectedtobeflownontheEOS-AQUAplatformin2002.SimulatedAIRSspectrawereusedtostudythesensitivityofAIRSradianceonthetroposphericandstratosphericozonechanges,andtostudytheimpactofvariouschannelcombinationsontheozoneprofileretrieval.SensitivitystudyresultsindicatethattheAIRShighresolutionspectralchannelsbetweenthewavenumber650-800cm-1provideveryusefulinformationtoaccuratelyretrievetroposphericandstratosphericozoneprofiles.EigenvectordecompositionofAIRSspectraindicatethatnomorethan100eigenvectorsareneededtoretrieveveryaccurateozoneprofiles.TheaccuracyoftheretrievedatmosphericozoneprofilefromthepresenttechniqueandutilizingtheAIRSdatawascomparedwiththeaccuracyobtainedfromcurrentAdvancedTIROSOperationalVerticalSounder(ATOVS)dataaboardNationalOceanicandAtmosphericAdministration(NOAA)satellites.Asexpected,acomparisonofretrievalresultsconfirmsthattheozoneprofileretrievedwiththeAIRSdataissuperiortothatofATOVS.

简介：InHL-2Atokamaks,thebehaviorofheatfluxdepositedonthedivertortargetshasbeenstudiedduringdeuteriumgasfuelling.Theheatfluxisreducedsignificantlyaftersupersonicmolecularbeaminjection(SMBI)fuellingduringOhmicandelectroncyclotronresonanceheating(ECRH)divertordischarges.TheSMBIfuellingcausesanincreaseintheplasmadensityandthischangeresultsintheexperiencedchangeoftheedgeproperties.MostofthisreductionindivertortargetheatfluxoccurstogetherwithahighplasmaradiationregionlocatedatneartheX-point.Thelargestreductioninheatfluxprofilesisobservedattheoutboarddivertorseparatrixstrikepoint,whiletheheatfluxfarfromthestrikepointremainsalmostunchanged.Inparticular,withSMBImulti-pulsesgasfuelling,apartiallydetacheddivertorregimeisobservedwithahighlyradiatingregionattheX-point.Withtheonsetofthepartiallydetacheddivertorregime,asuddendropinbothheatfluxandpowerflowonthedivertortargetisobserved.Thereductioninpowerloadonthedivertortargetsisroughlyequaltotheincreaseinplasmaradiationloss.

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简介：OpticalsimulationsofGaAs/AlGaAsthin-filmwaveguideswereperformedforinvestigatingthedependenceofthemodalbehavioronwaveguidegeometryandtheresultinganalyticalsensitivity.Simulationswereperformedfortwodistinctmid-infraredwavelengths,therebydemonstratingthenecessityofindividuallydesignedwaveguidestructuresforeachspectralregimeofinterest.Hence,themodalbehavior,sensitivity,andintensityoftheevanescentfieldwereinvestigatedviamodelingstudiesat1600and1000cm-1,therebyconfirmingtheutilityofsuchsimulationsfordesigningmid-infraredsensorsbasedonthin-filmwaveguidetechnology.

简介：疲劳行为在期间高测试的周期疲劳和5A06铝的张力的行为就anisotropy而言的合金被学习。标本的二种类型包括的纵的标本(与滚动平行方向)并且横向的标本(对滚动方向垂直)被准备。红外线的thermography被采用到监视温度进化在疲劳和张力的测试期间。在二个方向的温度进化曲线对比地被分析。它被发现温度进化在疲劳过程期间拥有四阶段：起始的温度上升舞台，慢温度衰落阶段，快速的温度上升阶段，和物件顶端的装饰物温度衰落舞台。产生四个阶段的机制的热被讨论。明显的差别罐头在疲劳力量在纵的标本和横向的标本之间被发现并且使生活疲劳。纵的标本的疲劳力量和疲劳生活比横向的标本的那些高。在期间张力并且疲劳测试过程，在横向的方向的破裂温度在纵的方向比那高。借助于红外线的thermography的疲劳力量预言由传统的方法与那有好一致性。

简介：有在水里推迟的10，50，100，和200nm的四条不同粒子直径的ZnOnanospheres的散布性质被调查理论并且试验性地在里面光谱全部可见范围的范围和在红外线附近的区域的部分。在水里推迟的ZnOnanospheres的散布性质被采用三个主要参数描述：散布紧张的尖分发我，散布扑灭系数敲打声,和散布的生气的节敲打声。结果在某个波长显示那(i)，因为当粒子直径从10～200nm增加时，一个显然前面繁殖的特征，和前面散布的紧张逐渐地是主导的，散布紧张的尖分发出现，并且(ii)散布扑灭系数和生气的节能被使用一件纯水样品和一件给定的ZnO样品的测量发射度变化决定；他们都被显示依赖于粒子尺寸和事件波长。四件不同散布样品的试验性的结果在给定的波长范围以内与理论预言同意很好。

简介：Developingalow-cost,room-temperatureoperatedandcomplementarymetal-oxide-semiconductor(CMOS)compatiblevisible-blindshort-wavelengthinfrared(SWIR)siliconphotodetectorisofinterestforsecurity,telecommunications,andenvironmentalsensing.Here,wepresentasilver-supersaturatedsilicon(Si:Ag)-basedphotodetectorthatexhibitsavisible-blindandhighlyenhancedsub-bandgapphotoresponse.Thevisible-blindresponseiscausedbythestrongsurface-recombination-inducedquenchingofchargecollectionforshort-wavelengthexcitation,andtheenhancedsub-bandgapresponseisattributedtothedeep-levelelectrontraps-inducedband-bendingandtwo-stagecarrierexcitation.TheresponsivityoftheSi:Agphotodetectorreaches504mA·W-1at1310nmand65mA·W-1at1550nmunder-3Vbias,whichstandsonthestageasthehighestlevelinthehyperdopedsilicondevicespreviouslyreported.Thehighperformanceandmechanismunderstandingclearlydemonstratethatthehyperdopedsiliconshowsgreatpotentialforuseinopticalinterconnectandpower-monitoringapplications.

简介：MicrostructuralevolutionofinfraredvacuumbrazedCP-TiusingtwoTi-basedbrazealloys,Ti-15Cu-15NiandTi-15Cu-25Ni,hasbeeninvestigated.TheinfraredbrazedjointconsistedofeutecticTi2Cu/Ti2NiintermetalliccompoundsandTi-richmatrix.TheeutecticTi2Cu/Ti2Niintermetalliccompoundsdisappearedfromthejointafterbeingannealedat900Cfor1h.Incontrast,thedepletionrateofbothCuandNifromthebrazealloyintoCP-Tisubstrateat750Cannealingwasgreatlydecreasedascomparedwiththatannealedat900C.BlockyTi2Cu/Ti2Niphaseswereobservedevenifthespecimenwasannealedat750Cfor15h.BecausetheNicontentoftheTi-15Cu-25NibrazealloyismuchhigherthanthatoftheTi-15Cu-15Nialloy,theamountofeutecticTi2Cu/Ti2NiphasesinTi-15Cu-25NibrazedjointismorethanthatinTi-15Ci-15Nibrazedjoint.However,similarmicrostructuralevolutioncanbeobtainedfromtheinfraredbrazedjointannealedatvarioustemperaturesand/ortimeforbothfillermetals.

简介：Thereflectivityofone-dimensionalchalcogenidephotoniccrystal(CGPC)structurewiththefirstorderreflectionbandinnearinfrared(NIR)regionistheoreticallystudied.Sb-SeandGe-Schalcogenideglassesareusedashighandlowrefractiveindexlayersrespectively,becausethesematerialshavezeroabsorptioninNIRregion.Thetransfermatrixmethod(TMM)isemployedtocalculatethereflectivespectraoftheproposedstructure.ThetheoreticalresultsofreflectivespectraofbulkchalcogenidematerialswiththecompositionofSb40Se60andGe30S70for4,8,12and15layersandthicknessesof117nmand183nmrespectively,atnormalincidence,arecloseagreementwiththeexperimentalresults.Furthermore,byincreasingthenumberoflayersofSb40Se60andGe30S70,thereflectionbandscanbeenhancedinthewiderrangeoftheNIRregionforthepolarizationatdifferentanglesandthusthebroadbandomnidirectionalreflectorcanbedesigned.