简介：因为煤气的红外线的吸收光谱线宽仅仅是在1000占据几的来源紧张的几纳米，它是平的不到光的噪音来源。煤气的吸收的信号在噪音被沉没，因此直接与光谱吸收测量气体的集中是不可能的。根据CH_4气体的差别吸收系统的原则和参数，一个察觉电路由lock-inamplifier组成了被设计。实验结果显示察觉电路能满足整个系统的需求，并且限制集中是150X10~(-6)。

简介：Basedonanalysisofnearinfraredspectralabsorptionofmethane,absorptiontypeopticalfibermethanegassensorwithhighsensitivityusingDFBLDasasourceisdemonstrated.Lightsourcemodulationharmonicmeasurementispresentedinthispaper.Inordertoeliminatethenoise,theratioofthefundamentalandsecond-harmonicsignalsisused.Themathematicalmodelofgasconcentrationharmonicmeasurementisbuiltup.Thedetectionresultofmethaneconcentrationisalsoshown.Experimentshaveprovedasensitivityof28×10-6.

简介：Itiswellknownthatopticaltomographycanaccuratelyandquantitativelyre-constructtherefractiveindexfieldofatransparentmediumanddisplaythethreedimensionalimageofotherthysicalquantitiesrelevanttotemperatureordensity.Inthispaper.anewmultidirectionalholographicinterferometricsystemisbuilt,andtwokindsofimagetecon-structionalgoritmaareintroducedandanautomaticimageprocessingsystemofinterfero-gramisdesigned.Athreedimentsionalasymmetricgadflowfieldaboveacombustorisexperi-mentallyinvestigatedwithholographicinterferormetry.Thereconstructedtemperaturesaresimilartothosemeasuredwithathermocouple.

简介：Acompactammoniagassensorwithtwogaschambersisproposedinthispaper,whosecoresensingdeviceisaU-bendingmicroringresonator.Thewaveguidesofringpartandfeedbackpartinthisresonatoraremadeofsilicononinsulator(SOI)ridgewaveguidecoveredwithZnOnanocrystalswhicharesensitivetoammoniagas.Thesensorcanmeasuretwogroupsofgassamplessimultaneously.Bycomputersimulation,weobtaintheclearsensitivitycurvesoftwogaschambersinammoniasensorwhenthegasconcentrationincreasesfrom0to4‰.Thegasconcentrationsintwochamberscanbeobtainedfromoneoutputspectrum,whichsignificantlyreducesthematerialandtimeconsumption.

简介：Wavelengthmodulationtechnique(WMT)andactiveintracavitytechnique(ACIT)arefirstintroducedinthispaper,whichareusedtorealizetheconcentrationdetectionofmethaneandacetylenerespectively.WhenACITiscombinedwithwavelengthsweeptechnique(WST),thedetectionsensitivityofacetylenecanbeenhancedsharply.WhenACITiscombinedwithWSTandWMT,thedetectionsensitivityofacetylenecanbeenhancedfurther.

简介：DV，MPEG-1，MPEG-2，MPEG-4，QuickTime，RealSystem，VideoforWindows，WindowsMedia，Kinoma，AIFF，AAC，MP3，WAV，BMP，JPEG／JFIF，PICT，PNG，QuickTime图形文件(QTIF)，SGI图形文件，TGA图形文件，TIFF以及其他视频、音频．动画和静态图形格式以及3GPP视频和AAC音频，还包括了基于PDA掌上操作系统Palm的Kinoma影视格式。

简介：在cleaner6中，便捷地使用自动的工作流程并不意味着以牺牲质量为代价。智能化的色彩空间转换，本地YUV处理，可编辑滤镜的完整选择以及随时备用的配置文件，可令你为每一种不同输出格式来优化质量。cleaner6中有一套全新的专业化音频滤镜，这样，你制作的媒体产品不光画面优美，其声音效果也会十分出色。

简介：现在让我们来介绍一下Discreet的cleaner6软件吧：它集成了你所必需的所有工具。可帮助你将那些凡俗的媒体产品升华为令人震惊的产品；高质量滤镜以及业界领先的编码器，帮你创作出极其精彩的符合WindowsMedia、RealPlay和QuickTime6的视频产品；通过使用MPEG-4和Kinoma标准，帮你创制掌上PDA(个人数字助理)以及手机的视频产品。

简介：在这份报纸，我们描述基本原则和连续波浪洞铃流光谱学(CWCRDS)的系统设计。我们特别地也学习性质和一个新奇方法的行为到去谐激光并且把它用于一个洞铃流光谱学实验。模拟和实验在在传播特征和不同反射率之间的关系上被完成，以及扫描速度。产量电场方程被推出。这被调查了光子怎么被联合到洞并且怎么作为时间的功能从洞积累紧张和漏缝。紧张和腐烂时间的两累积减少，这被注意，并且当反射率增加，摆动振幅增加。有减少扫描速度的相对紧张增加。另外，模拟证明一个去谐得非的洞显示高度依赖于镜子反射率和压电的翻译程序(PZT)调整速度的播送信号。模拟也显示关上的激光与detuning不同。

简介：基于钯(Pd)和裂片(Ag)察觉到系统的新奇光纤维氢被建议。由直接电流(DC)磁控管过程，Pd/Ag合金极端薄的电影在底层上被扔基于纯Pd消除传感器的氢embrittlement。有不同薄电影厚度的几件样品在不同底层温度被制作并且在光纤维氢传感器安装测试了。我们为获得最佳劈啪作响做一系列实验参数，例如最佳劈啪作响，Pd/Ag合金的温度和厚度拍摄。为光纤维氢气体传感器的湿度效果和可靠性实验详细被报导。严峻的结果证明Pd/Ag合金是为光纤维氢气体传感器的有希望的材料。

简介：Inexperimentalstudyofthetindioxidegassensor,insitusheetconductivitywasmeasuredwithultrahighvacuumfourpointresistivityprobe.Surfacecompositionandstoi-chiometryweredetectedusingXPS.FourseparatestructurephaseswereobtainedbyLEEDatdifferentannealingtemperature,andemissionwasobservedthroughoutthebandgapuptotheFermilevelwithUPS.Furthermore,effectsofannealingtemperatureanddosedoxygenpressureonthesurfacereconstruction,O/Snratio,sheetconductivity,variationoftheworkfunctionandbandbendinghavebeenalsoinvestigated.Theresultshelpustorevealtherelationshipsbetweentheelectronicandelectricalpropertiesofthematerialanditsnativedefectsstructure.Itises-peciallyusefultoprovideamorecompleteunderstandingofthebasicoperationmechanismsforsuchsensingmaterials.

简介：Ozoneisagreenhousegas.Ozoneabsorptioncrosssectionshavebeenreportedwithdiscrepanciesandinconsistencies.Inthispaper,simultaneouseffectsoftheopticalpathlengthandtemperaturevariationsonozonegasabsorptioncrosssectionsareinvestigatedatdifferentwavelengths.HITRAN2012,thelatestavailablelinelistonspectralcalc.comsimulator,isusedinthisstudytosimulateozonegasabsorptioncrosssectionsinrelationtothesimultaneouseffectsoftheopticalpathlengthandtemperatureatthewavelengthsof603nmand575nm.Resultsobtainedforgascellswiththeopticalpathlengthfrom10cmto120cmshowthatthedecreaseintemperaturesfrom313Kto103Kresultsintheincreaseinozonegasabsorptioncrosssections.Atwavelengthsof603nmand575nm,thepercentageincreaseofozonegasabsorptioncrosssectionsis1.22%and0.71%,respectively.Resultsobtainedinthisstudyshowthatinthevisiblespectrum,atconstantpressure,ozonegasabsorptioncrosssectionsaredependentonthetemperatureandwavelengthbutdonotdependontheopticalpathlength.Analysisinthisworkaddressesdiscrepanciesinozonegasabsorptioncrosssectionsinrelationtothetemperatureinthevisiblespectrum;thus,theresultscanbeappliedtogetoptimalconfigurationofhighaccuracyozonegassensors.

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简介：Mac机自身的CD和DVD刻录功能非常棒，不过如果面临刻录大量的CD或DVD就会有点吃力了。那些需要强大的刻录软件的人，可以选择Roxio公司的Toast。

简介：AnewFFTalgorithmhasbeendeduced,whichiscalledthebase-6FFTalgorithm.TheamountforcalculatingtheDFTofcomplexsequenceofN=2rbythebase-6FFTalgorithmisMr(N)=14/3*Nlog6N-4N+4formultiplicationoperationofrealnumberandAr(N)=23/3*Nlog6N-2N+2foradditionoperationofrealnumber.TheamountforcalculatingtheDFTofrealsequenceisahalfofitwiththecomplexsequence.

简介：Aneworganicsemiconductortartaricaciddopedsaltofemeraldinepolyaniline(PANI-C4H6O6)hasbeenobtainedbythemethodofoxidativepolymerizationofmonomericanilinewithammoniumpersulfateinacidicsolution.ThestructurewascharacterizedbyFourierTransformInfraredtechnique(FTIR)andX-raydiffraction(XRD).Thetemperaturedependencedcconductivityδdc(T)showsasemiconductorbehaviorandfollowsthequasionedimensionalvariablerangehopping(Q1D-VRH)model.Dataonδdc(T)arealsodiscussed.

简介：Wetheoreticallypresenttheintrinsiclimitstoelectronmobilityinthemodulation-dopedAlGaN/GaNtwo-dimensionalelectrongas(2DEG)duetoeffectsincludingacousticdeformationpotential(DP)scattering,piezoelectricscattering(PE),andpolar-opticphononscattering(POP).WefindthatDEandPEarethemoresignificantlimitingfactorsatintermediatetemperaturesof40Kto250K,whilePOPbecomesdominantasroomtemperatureisapproached.Detailednumericalresultsarepresentedforthechangeofelectronmobilitywithrespecttotemperatureandcarrierdensity.Weconcludethatthesethreetypesofphononscattering,whicharegenerallydeterminedbythematerialpropertiesbutnotthetechnicalprocessing,arehardlimitstothe2DEGmobility.

简介：基于IPv6协议的下一代互联网在世界范围内正在被逐步部署，IPv6协议在未来几十年内将成为互联网的基本协议。讨论了IPv6协议的主要特性；介绍了这些新特性的应用机制；并对IPv6和IPv4两种协议之间的主要区别进行了对比。最后指出，IPv6必将取代IPv4，成为互联网主流协议。

简介：上期我们刊登了VirtualPC6的初始设置以及常用菜单的一部份介绍，这期将继续为大家将菜单项目的介绍补充完成，并对打印等问题进行说明。