相控阵天线讲的深入浅出，很有参考价值1Radiation11.1TheEarlyHistoryofElectricityandMagnetism11.2JamesClerkMaxwell,TheUnionofElectricityandMagnetism81.3RadiationbyAcceleratedCharge101.4ReactiveandRadiatingElectromagneticFields18References182Antennas192.1TheEarlyHistoryofAntennas192.1.1ResonantElectricCircuit202.1.2HeinrichHertz:TheFirstAntennaandRadioSystem232.1.3GuglielmoMarconi,theDawnofWirelessCommunication28viCONTENTS2.1.4AftertheFirstTransatlanticTransmission352.1.5Directivity402.2AntennaDevelopmentsDuringtheFirstWorldWar442.3AntennaDevelopmentsinBetweentheWars472.3.1Broadcasting472.3.2Microwaves482.4AntennaDevelopmentsDuringtheSecondWorldWar502.4.1Radar502.4.2OtherAntennaDevelopments602.5Post-WarAntennaDevelopments722.5.1FrequencyIndependentAntennas732.5.2HelicalAntenna742.5.3MicrostripPatchAntenna752.5.4PhasedArrayAntenna76References803AntennaParameters833.1RadiationPattern833.1.1FieldRegions843.1.2Three-DimensionalRadiationPattern873.1.3PlanarCuts913.1.4PowerPatternsandLogarithmicScale963.1.5DirectivityandGain983.1.6Reciprocity1013.1.7AntennaBeamwidth1023.2AntennaImpedanceandBandwidth1033.3Polarisation1073.3.1EllipticalPolarisation1073.3.2CircularPolarisation1093.3.3LinearPolarisation1103.3.4AxialRatio1103.4AntennaEffectiveAreaandVectorEffectiveLength1123.4.1EffectiveArea1123.4.2VectorEffectiveLength1143.5RadioEquation1153.6RadarEquation1173.6.1RadarCross-Section118References120CONTENTSvii4TheLinearBroadsideArrayAntenna1234.1ALinearArrayofNon-IsotropicPoint-SourceRadiators1234.2PlaneWaves1244.3ReceivedSignal1264.4ArrayFactor1314.5SideLobesandGratingLobes1314.5.1FirstSide-LobeLevel1314.5.2GratingLobes1324.6AmplitudeTaper133References1355Designofa4-Element,Linear,Broadside,Microstrip

Despitetheincreasinguseofcomputers,thebasicneedformathematicaltablescontinues.Tablesserveavitalroleinpreliminarysurveysofproblemsbeforeprogrammingformachineoperation,andtheyareindispensabletothousandsofengineersandscientistswithoutaccesstomachines.Becauseofautomaticcomputers,however,andbecauseofrecentscientificadvances,agreatervarietyoffunctionsandahigheraccuracyoftabulationthanhavebeenavailableuntilnowarerequired.In1954,aconferenceonmathematicaltables,sponsoredbyM.I.T.andtheNationalScienceFoundation,mettodiscussamodernizationandextensionofJahnkeandEmde'sclassicaltablesoffunctions.Thisvolume,published10yearslaterbytheU.S.DepartmentofCommerce,istheresult.Designedtoincludeamaximumofinformationandtomeettheneedsofscientistsinallfields,itisamonumentalpieceofwork,acomprehensiveandself-containedsummaryofthemathematicalfunctionsthatariseinphysicalandengineeringproblems.Thebookcontains29setsoftables,sometoashighas20places:mathematicalconstants;physicalconstantsandconversionfactors(6tables);exponentialintegralandrelatedfunctions(7);errorfunctionandFresnelintegrals(12);Besselfunctionsofinteger(12)andfractional(13)order;integralsofBesselfunctions(2);Struveandrelatedfunctions(2);confluenthypergeometricfunctions(2);Coulombwavefunctions(2);hypergeometricfunctions;Jacobianellipticandthetafunctions(2);ellipticintegrals{9);Weierstrassellipticandrelatedfunctions;paraboliccylinderfunctions{3);Mathieufunctions(2);spheroidalwavefunctions(5);orthogonalpolynomials(13);combinatorialanalysis(9);numericalinterpolation,differentiationandintegration(11);probabilityfunctions(ll);scalesofnotation(6);miscellaneousfunctions(9);Laplacetransforms(2);andothers.Eachofthesesectionsisprefacedbyalistofrelatedformulasandgraph

Inthisuniquetext,authorsAlfriendetal.provideacoherentdiscussionofspacecraftrelativemotion,bothintheunperturbedandperturbedsettings,explainthemaincontrolapproachesforregulatingrelativesatellitedynamics,usingbothimpulsiveandcontinuousmaneuvers,andpresentthemainconstituentsrequiredforrelativenavigation.Theearlychaptersprovideafoundationuponwhichlaterdiscussionsarebuilt,makingthisacomplete,standaloneoffering.Intendedforgraduatestudents,professorsandacademicresearchersinthefieldsofaerospaceandmechanicalengineering,mathematics,astronomyandastrophysics,SpacecraftFormationFlyingisatechnicalyetaccessible,forward-thinkingguidetothiscriticalareaofastrodynamics.Thefirstbookdedicatedtospacecraftformationflying,writtenbyleadingresearchersandprofessorsinthefieldDevelopsthetheoryfromanastrodynamicalviewpoint,emphasizingmodeling,controlandnavigationofformationflyingsatellitesonEarthorbitsExamplesusedtoillustratethemaindevelopments,withasamplesimulationofaformationflyingmissionincludedtoillustratehighfidelitymodeling,controlandrelativenavigation

Computingobject-basedsaliencyvialocality-constrainedlinearcodingandconditionalrandomfields

TIME-HARMONICELECTROMAGNETICFIELDS时谐电磁场经典教材作者：RogerF.Harrington目录：ForewordtotheRevisedEdition.Preface.FundamentalConcepts.IntroductiontoWaves.SomeTheoremsandConcepts.PlaneWaveFunctions.CylindricalWaveFunctions.SphericalWaveFunctions.PerturbationalandVariationalTechniques.MicrowaveNetworks.AppendixA:VectorAnalysis.AppendixB:ComplexPermittivities.AppendixC:FourierSeriesandIntegrals.AppendixD:BesselFunctions.AppendixE:LegendreFunctions.Bibliography.Index.

WeinbergdistillstheessencefromvonBertalanffy'sclassicandmanagestopresentitinaveryaccessiblefashion.Thebookhasbeenoutofprintforquiteawhilesoitisgreattoseeanewedition.Themessageandinformationcontainedinhere,althoughoriginallypublishedin1975,isnowmorerelevantthanever.Weinbergcoversmanyaspectsofsystemstheorybeginningwiththemainstumblingblockwiththepresentscientificparadigm:theideathattheuniverseismechanistic.HistreatmentismuchmoregeneralthanRobertRosen'sin"LifeItself"butstillconveyswhythemechanisticnotionisflawed.Hethenoutlinesthegeneralsystemstheoryapproachbeforeleadingintotheideathatasystemissimplyawayoflookingattheworld.Hethenoutlinestheprincipleofindifference.Thisleadsstraightintotwosectionsoutliningvariousaspectsofmakingobservations.Finallyhediscussesbehaviourandthensomegeneralsystemsquestions.Throughoutthebookheusesmanyexamplesfromdisparatefieldsinconjunctionwithquestionsforfurtherresearch.Itisgreattoseesomeonewhodoesn'tpreachsystemsbutactuallyusestheideas.Definitelyamust-readaswedecidedhowtosolvethemyriadofissuesbeforeus.

人体姿态估计论文（openpose)　RealtimeMulti-Person2DPoseEstimationusingPartAffinityFields∗

TheFirstPractical,Hands-OnGuidetoEmbeddedSystemProgrammingforAndroidToday,embeddedsystemsprogrammingisamorevaluabledisciplinethanever,drivenbyfast-growing,newfieldssuchaswearabletechnologyandtheInternetofThings.Inthisconciseguide,RogerYeteachesalltheskillsyou’llneedtowritetheefficientembeddedcodenecessarytomaketomorrow’sAndroiddeviceswork.ThefirsttitleinAddison-Wesley’snewAndroid™DeepDiveseriesforintermediateandexpertAndroiddevelopers,EmbeddedProgrammingwithAndroid™drawsonRogerYe’sextensiveexperiencewithadvancedprojectsintelecommunicationsandmobiledevices.Stepbystep,heguidesyouthroughbuildingasystemwithallthekeycomponentsAndroidhardwaredevelopersmustdelivertomanufacturing.Bythetimeyou’redone,you’llhavethekeyprogramming,compiler,anddebuggingskillsyou’llneedforreal-worldprojects.First,Yeintroducestheessentialsofbare-metalprogramming:creatingassemblylanguagecodethatrunsdirectlyonhardware.Then,buildingonthisknowledge,heshowshowtouseCtocreatehardwareinterfacesforbootingaLinuxkernelwiththepopularU-Bootbootloader.Finally,hewalksyouthroughusingfilesystemimagestobootAndroidandlearningtobuildcustomizedROMstosupportanynewAndroiddevice.Throughout,Yeprovidesextensivedownloadablecodeyoucanrun,explore,andadapt.YouwillBuildacompletevirtualizedenvironmentforembeddeddevelopmentUnderstandtheworkflowofamodernembeddedsystemsprojectDevelopassemblyprograms,createbinaryimages,andloadandrunthemintheAndroidemulatorLearnwhatittakestobringupabootloaderandoperatingsystemMovefromassemblertoC,andexploreAndroid’sgoldfishhardwareinterfacesProgramserialports,interruptcontrollers,realtimeclocks,andNANDflashcontrollersIntegrateCruntimelibrariesSupportexceptionhandlingandtimingUseU-Boottobootthe

《SAPABAP开发从入门到精通》以应用实例的形式，讲解了SAPABAP开发的相关知识点，详细介绍了SAPABAP开发者必须掌握的包与变更传输系统（CTS）、数据类型、数据库、模块化程序、内表、调试、ABAP数据字典、锁对象、检索帮助、FieldSymbol与数据引用、SAP内存与ABAP内存、报表程序、模块池程序、ABAP对象、面向对象ALV、FunctionALV、SALV等知识。

ElectromagneticFieldTheoryFundamentals2nded-B.Guru,H.Hiziroglu本书简明易懂，贴近读者，深受广大师生欢迎。
　　本书包含许多实例、问题、章末小结和适当的背景材料。
书中首先介绍静电磁场和静磁场的基本概念，继而讲解麦克斯韦尔方程、电磁传播、电磁传输和电磁辐射。
另外，还增加了关于有限元法和有限差分法的章节以及关于史密斯圆图的详细附录。
　　1ELECTROMAGNETICFIELDTHEORY1.1Introduction1.2FieldConcept1.3VectorAnalysis1.4DifferentialandIntegralFormulations1.5StaticFields1.6Time-VaryingFields1.7ApplicationsofTime-VaryingFields1.8NumericalSolutions1.9FurtherStudy2VECTORANALYSIS2.1Introduction2.2ScalarandVectorQuantities2.3VectorOperations2.4TheCoordinateSystems2.5ScalarandVectorFields2.6DifferentialElementsofLength,Surface,andVolume2.7Line,Surface,andVolumeIntegrals2.8TheGradientofaScalarFunction2.9DivergenceofaVectorField2.10TheCurlofaVectorField2.11TheLaplacianOperator2.12SomeTheoremsandFieldClassifications2.13VectorIdentities2.14Summary2.15ReviewQuestions2.16Problems3ELECTROSTATICS3.1Introduction3.2Coulomb’sLaw3.3ElectricFieldIntensity3.4ElectricFluxandElectricFluxDensity3.5TheEIectricPotential3.6ElectricDipole3.7MaterialsinanElectricField3.8EnergyStoredinanEIectricField3.9BoundaryConditions3.10CapacitorandCapacitance3.11Poisson’sandLaplace’sEquations3.12MethodofImages3.13Summary3.14ReviewQuestions3.15Problems4STEADYELECTRICCURRENTS4.1Introduction4.2NatureofCurrentandCurrentDensity4.3ResistanceofaConductor4.4TheEquationOfContinuity4.SRelaxationTime4.6Joule’sLaw4.7SteadyCurrentinaDiode4.8BoundaryConditionsforCurrentDensity4.9AnalogyBetweenDandJ4.10TheElectromotiveForce4.11Summary4.12ReviewQuestions4.13Problems1ELECTROMAGNETICFIELDTHEORY1.1Introduction1.2FieldConcept1.3VectorAnalysis1.4DifferentialandIntegralFormulations1.5StaticFields1.6Time-VaryingFields1.7ApplicationsofTime-VaryingF

在日常工作中，钉钉打卡成了我生活中不可或缺的一部分。然而，有时候这个看似简单的任务却给我带来了不少烦恼。 每天早晚，我总是得牢记打开钉钉应用，点击"工作台"，再找到"考勤打卡"进行签到。有时候因为工作忙碌，会忘记打卡，导致考勤异常，影响当月的工作评价。而且，由于我使用的是苹果手机，有时候系统更新后，钉钉的某些功能会出现异常，使得打卡变得更加麻烦。 另外，我的家人使用的是安卓手机，他们也经常抱怨钉钉打卡的繁琐。尤其是对于那些不太熟悉手机操作的长辈来说，每次打卡都是一次挑战。他们总是担心自己会操作失误，导致打卡失败。 为了解决这些烦恼，我开始思考是否可以通过编写一个全自动化脚本来实现钉钉打卡。经过一段时间的摸索和学习，我终于成功编写出了一个适用于苹果和安卓系统的钉钉打卡脚本。