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简介：充分发挥计算机辅助教学的优越性———由一节课所想到的韦丽萍（桂林民族师范学校桂林５４１００１）在中师物理教材中，由于其师范性特点，有别于高中物理，在知识深度上要求较浅，而在知识广度以及定性讨论方面要求较多，而往往有些实验由于各方面的原因，在课堂上做...

简介：FortheAMANDAexperimentanewtypeofopticalmodule-thedigitalanalogopticalModule(dAOM)-hasbeendeveloped,Itincorporatessomelocal'intelligece'forslowcontrolandactiveelectronicsforanalogpulsetransmission.Morethan20dAOMprototypeshavebeensuccessfullydeployedintothepolariceduringthe1999/2000antarcticseasonandarerunningsincethattime.TheyareconnectedtothedAOMDAQboardsatthesurfacebysingletwistedparicablesoverdistancesupto2.7km.CORBAbasedclient-serverapplicationsestablishworld-wide,logicalaccesstoeverydAOM.

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简介：Inordertoimprovetheresolutionofdigitalholographywithacommon-dimensioncharge-coupleddevice（CCD）sensor,thepointspreadfunctionsarebrieflyderivedforthecommonlyusedandpracticalpost-magnification,pre-magnification,andimage-planedigitalholographicmicroscopicsystems.Theultimateresolutionsofthesesystemsareanalyzedandcompared.Theresultsshowthattheultimatelateralresolutionofpre-magnificationdigitalholographyissuperiortothatofpost-magnificationdigitalholographyinthesameconditions.Wealsodemonstratethattheultimatelateralresolutionofimage-planedigitalholographyhasnocorrelationwiththephotosensitivedimensionoftheCCDsensor,anditisnotsignificantlyrelatedtothepixelsizeofthesensor.Moreover,boththeultimateresolutionandtheimagingqualityofimage-planedigitalholographyaresuperiortothatofpre-andpost-magnificationdigitalholographicmicroscopy.High-resolutionimaging,whoseresolutionisclosetotheultimateresolutionofthemicroscopeobjective,canbeachievedbyimage-planedigitalholographyevenwithasubmillimeter-dimensionsensor.Thissystem,bywhichperfectimagingcanbeachieved,isoptimalforcommonlyuseddigitalholographicmicroscopy.Experimentalresultsdemonstratethecorrectnessofthetheoreticalanalysis.

简介：在水泥臼板中的冲击波的相互作用被数字点缀关联方法和数字高速度的摄影技术学习。当盘子被同时爆炸的二根雷管破坏时，冲击波地的变化被获得。试验性的结果证明冲击波的相互作用将导致本地正常紧张的非线性的巨大的增加，导致大变丑和严肃的破坏。然而，这强烈非线性的现象的出现易感知地取决于在雷管之间的间隔，并且间隔什么时候比在哪儿的区域的直径小，将仅仅出现冲击波存在。

简介：Objectives:Polymerizationshrinkageofdentalcompositesremainsamajorconcerninrestorativedentistrybecauseitcanleadtomicro-crackingofthetoothanddebondingatthetooth-restorationinterface.Theaimofthisstudywastomeasurethefull-fieldpolymerizationshrinkageofdentalcompositesusingtheopticaldigitalimagecorrelation(DIC)methodandtoevaluatehowthemeasurementisinfluencedbythefactorsinexperimentsetupandimageanalysis.Methods:Fourcommercialdentalcomposites,PremiseDentine,Z100,Z250andTetricEvoCeram,weretested.Compositewasfirstplacedintoaslotmouldtoformabarspecimenwithrectangular-sectionof4mmmm,followedbythesurfacepaintingtocreateirregularspeckles.Curingwasthenappliedatoneendofthespecimenwhiletheotherpartwerecoveredagainstcuringlightforsimulatingtheclinicalcuringconditionofcompositeindentalcavity.Thepaintedsurfacewasrecordedbyacharge-coupleddevice(CCD)camerabeforeandaftercuring.Subsequently,thevolumetricshrinkageofthespecimenwascalculatedwithspecialistDICsoftwarebasedonimagecrosscorrelation.Inaddition,afewfactorsthatmayinfluencethemeasuringaccuracy,includingthesubsetwindowsize,specklesize,illuminationlightandspecimenlength,werealsoevaluated.Results:ThevolumetricshrinkageofthespecimengenerallydecreaseswithincreasingdistancefromtheirradiatedsurfacewithaconspicuousexceptionbeingthecompositePremiseDentineasitsmaximumshrinkageoccurredatasubsurfacedistanceofabout1mminsteadoftheirradiatedsurface.Z100hadthegreatestmaximumshrinkagestrain,followedbyZ250,TetricEvoCeramandthenPremiseDentine.Largersubsetwindowsizemadetheshrinkagestraincontoursmoother.Butthecostwasthatsomedetailsintheheterogeneityofthematerialwerelost.Verysmallsubsetwindowsizeresultedinalotofnoiseinthedata,makingitdifficulttodiscernthegeneralpatterninthestraindistribution.Speckle

简介：Theα-decayofneutron-deficientheavynucleifarfromstabilityisanindispensablespectroscopictooltostudytheirlow-energystructure.220Pa,atrans-leadisotopeneartheshellclosureN=126,itsdecaypropertiesarestillnotwellestablished,thoughitwasstudiedintwoα-decayexperiments30yearsago[1,2].Recently,weappliedsuccessfullythemoderndigitalpulseprocessing(DPP)technique[3,4]tothedecayspectroscopyintheZ≥91andN=128~131region[5]andthedecaychainof220Pawasestablishedatthefirsttime.

简介：Neuronswithcomplex-valuedweightshavestrongercapabilitybecauseoftheirmulti-valuedthresholdlogic.Neuronswithsuchfeaturesmaybesuitableforsolutionofdifferentkindsofproblemsincludingassociativememory,imagerecognitionanddigitallogicalmapping.Inthispaper,robustnessortoleranceisintroducedandnewlydefinedforthiskindofneuronac-cordingtoboththeirmathematicalmodelandtheperceptronneuron'sdefinitionofrobustness.Also,themostrobustdesignforbasicdigitallogicsofmultiplevariablesisproposedbasedontheserobustneurons.Ourproofprocedureshowsthat,inrobustdesigneachweightonlytakesthevalueofior-i,whilethevalueofthresholdiswithrespecttothenumberofvariables.Theresultsdemonstratethevalidityandsimplicityofusingrobustneuronsforrealizingarbitrarydigitallogicalfunctions.

简介：关于X光折射率小于1的讨论=AdiscussionontherefractiveindexofX—raylessthan1[刊,中]/谭业武(滨州师范专科学校物理系)∥大学物理.—1994.13(11).—22—23,21从几个不同的方面讨论了X光的折射率,并通过

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简介：O434.2//TN232001021486紫外线技术在军事上的应用研究=Studyofapplicationofultravioletteehnolgoytomilitaryaffairs[刊,中]/张忠廉,刘榴娣(北京理工大学光电工程系.北京(100081))//光学技术.-2000,26(4).-289-293,296介绍了紫外线在军事上的应用和紫外波段光电探测器件的发展情况以及国内外紫外技术在军事上应用概况,提出了在军事应用方面如何对紫外线技术作进一步研究的建议。(李瑞琴)

简介：应用于高能闪光X光照相技术的X射线源主要是强流电子束与重金属靶相互作用产生的韧致辐射，一般应用电子直线感应加速器（LIA）产生强流电子束，电子束被聚焦到一个很小的焦斑后打靶。进行闪光照相时，X射线斑点大小是一关键参量，直接影响成像的分辨能力。由于高能X射线的强穿透能力和强辐射环境，传统的小孔成像法难以应用。

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简介：ThesplittingofpotentialenergylevelsforgroundstateX2ΠgofOx2(x=+1,1)underspin–orbitcoupling(SOC)hasbeencalculatedbyusingthespin–orbit(SO)multi-configurationquasi-degenerateperturbationtheory(SO-MCQDPT).TheirMurrell–Sorbie(M–S)potentialfunctionsaregained,andthenthespectroscopicconstantsforelectronicstates2Π1/2and2Π3/2arederivedfromtheM–Sfunction.TheverticalexcitationenergiesforOx2(x=+1,1)areν[O+12(2Π3/2→X2Π1/2)]=195.652cm1,andν[O12(2Π1/2→X2Π3/2)]=182.568cm1,respectively.Allthespectroscopicdataforelectronicstates2Π1/2and2Π3/2aregivenforthefirsttime.

简介：YBa2Cu3Ox(YBCO)thinfilmsgrownondifferentsubstrateswithand/orwithoutEu2CuO4(ECO)bufferlayerwereinvestigatedbyX-raywideanglediffraction,reflection,diffusescatteringandtopography.TheresultsshowthatfortheyttriastabilizedZrO2(YSZ)substrate,thepresenceofanECObufferlayerimprovesthecrystallinequalityoftheYBCOfilm,whileanegativeeffectisobservedfortheSrTiO3(STO)substrate.ThelateralcorrelationlengthforasamplegrownonaYSZsubstratewithECObufferLayerismuchgreaterthangrownonanSTOsubetrate.TheSTOsubstrateusedhasmosaicstructure.2001ElsevierScienceB.V.Allrightsreserved.

简介：在计算机化的断层摄影术(CT)的膀胱的分割想象是在放射治疗计划前列腺癌症的重要的步。我们在场自动地描出的一个新分割计划在与三个学生一起的CT图象的膀胱轮廓走。首先，我们使用吝啬的移动算法获得包含膀胱的不平的轮廓的一幅聚类的图象，它然后被使用一个成长区域的算法，起始的种子点从扫描进程的一个线每篇文字题目下作者的署名选择了在第二步提取。第三步是用转动球算法更精确地精制膀胱轮廓。这些步然后被扩大以一种slice-by-slice方式分割膀胱体积。获得的结果与由放射肿瘤学家的用手的分割相比。敏感，特性，积极预计用价值，否定预计用价值，和Hausdorff距离的平均价值分别地是86.5%，96.3%，90.5%，96.5%，和2.8象素。结果证明膀胱能精确地被分割。

简介：通过软件实现了用ＰＣ机调用日本Ｒｉｇａｋｕ公司生产的Ｄ／ｍａｘ一类Ｘ射线衍射仪测量数据，利用ＰＣ机的复杂计算功能，使原有仪器也可以进行新的结构分析工作，扩展了仪器的功能。

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简介：小角X射线散射(SAXS)是研究多孔材料结构的一种有效方法．可得到孔径分布、平均孔径、比表面、界面层厚度、分形维数等许多微结构信息．SAXS理论公式基于点状光源(针孔准直)，但实践中则大多采用长狭缝准直条件．简要综述了SAXS在长狭缝准直条件下直接应用模糊强度进行煤、炭、二凝胶、分子筛等多孔材料结构解析的方法、并与针孔准直进行了对比。