简介：

简介：Forasyntheticapertureradar(SAR)systemmountedonageostationaryEarthorbit(GEO)satellite,thetrackcanbecurvilinear.Thus,abistaticSARsystembasedupongeostationarytransmitterand'receive-only'SARsystemonboardairplanes,namelyGEOspaceborne-airbornebistatic(GEOSA-BiSAR),issignificantlydifferentfromthetraditionalbistaticSAR.ThispapermainlystudiestheresolutioncharacteristicoftheslidingspotlightGEOSA-BiSARsystem.Firstly,thecommonazimuthcoverageandcoherentaccumulatedtimearetheoreticallyanalyzedindetail.Then,basedonthegradientmethod,theaccuratetwodimensionalresolutionofaGEOSA-BiSARsystemisanalyticallycalculated.Finally,thesimulationdatashowthecorrectnessandeffectivenessoftheproposedresolutionanalysismethod.

简介：WiththeconditionsofsmalldatasizeandlowSignal-to-NoiseRatio(SNR),theapplicationofHigherOrderStatistics(HOS)isrestrainednotonlybyitshighestimationvariance,butalsobyitslowestimationprecision.Therefore,amodifiedHOSbasedTimeDelayEstimation(TDE)algorithmisproposedtoovercometheseproblems.ComparingwiththeconventionalTDEalgorithms,theestimationvarianceisimprovedgreatly.Atypicalsimulationexampleiscompletedinordertotesttheperformanceofthealgorithmproposed,whichshowsthattheproposedalgorithmhasadvantagesoverthetraditionalonesinbothdetectionperformanceandcomputationefficiency.

简介：Theprincipleofthetwocarrierscontributingtocarrythepixelsignalchargesisfirstlypresented,andthenthebipolarjunctionphotogatetransistor(BJPT)withhighperformanceisproposedfortheCMOSimagesensor.Thenumericalanalyticalmodelofthephoto-chargetransferforthebipolarjunctionphotogateisestablishedindetail.Somenumericalsimulationsareobtainedunder0.6μmCMOSprocess,whichshowthatitsreadoutrateincreasesexponentiallywiththeincreaseofthephoto-chargeatappliedvoltage.

简介：至于单个模式对称的步折射索引结构电介质平面光波导当它的产量结束被限制时，绕射的领域分发被导出。它能被表示为在迪拉克功能和Lorenz功能之间的卷绕旋转。加深限制衍射的识别是有用的。绕射的领域的特征被讨论。在中央明亮的穗对一半的半最大的紧张的完整的角度宽度的变化曲线裂缝的宽度被数字计算介绍，并且有指数的功能的恰当的曲线接近它。

简介：ThetransmissionerrorcodeperformanceofsquareMQAMandstarMQAMmodulationschemesfortheAGWNRayleighfadingchannelisanalyzed.ThecorrespondingBERformulasandcomputeraidednumericresultsaregiven.ThereforeitprovidesatheoreticalbasisforchoosingMQAMmodulationschemesinmobilecommunications.

简介：Thispaperconsidersafrequency-divisionduplex(FDD)two-waychannelwithchannelestimationerror,wherechannelgainsareindependentofeachother.Itderivestheexactclosed-formoutageprobabilityexpressionsintheFDDsystemwithanalognetworkcoding(ANC)byuseofprobabilitytheory.Toprovidemoreinsights,anapproximatedversionfortheexactoutageprobabilityisalsodevelopedinthemedium-to-highsignal-to-noiseratio(SNR)region.ThesimulationresultsshowthatthederivedexactoutageprobabilitiesmatchtheresultsofMonteCarlosimulationsinallSNRregions,whiletheapproximatedoutageprobabilitiesalsoapproachthesimulationresultswhenthechannelconditionisgood.ItisinterestingthatANCintheFDDtwo-waychannelisprovedtooutperformthatofinthetime-divisionduplex(TDD)channelbythecomputersimulation.

简介：Thezero-voltagequasi-resonantboostswitchingDC-DCconverterhasbeeninves-tigatedbyusingthetimeaveragingequivalentcircuitapproachofperiodicallyswitchinglinearnetworks.TheDCsteadystateandACsmallsignalcharacteristicsoftheconverterarealsogiven.

简介：TheelectromagneticpropagationthroughaninhomogeneousmagnetizedplasmaslabisstudiedusingtheZ-transformformulationoftheFinite-DifferenceTime-Domain(FDTD)method.Thedirectionofelectromagneticpropagationisparalleltothebiasingmagneticfiled.TovalidatetheZ-transformalgorithm,thereflectionandtransmissioncoefficientsfortheright-handcircularlypolarizedwaveofthehomogeneousmagnetizedplasmaslabarecomputedbymeansofdiscreteFouriertransform.ThecomparisonbetweenthereflectionandtransmissioncoefficientsofthehomogeneousplasmaslabandanalyticalvaluesindicatesthatZ-transformalgorithmisveryaccurate.Whentheplasmafrequencyvariesaccordingtothesquarerootandparabolicrelations,thereflectionandtransmissioncoefficientsoftheinhomogeneousmagnetizedplasmaslabarecomputed.

简介：Themicroscopicmechanismoflowlevellaserirradiation(LLLI)mendingrheologyforbloodisanalyzedbythequantumtheory.Theresultsshowthatthelasercanresolvethefibrinclot,sothepropertyofbloodrheologyisimproved,andsomebondsofthecholesterolinbloodarefracturedbythelowlevellaser(LLL).Hencetheratioofmembranecholesteroltomembranephosphatideoftheredcellisreduced,andthenthebloodcirculationcanbeimproved.Theclinicalcuredtestsandsomecorrelativetestdatacanbeexplainedbythetheoreticalanalysesinthispaper.

简介：在我们调查了的这份报纸，downlink的表演概括了分布式的天线系统(GDAS)。在空间相关褪色的条件的假设下面，我们根据Bessel功能的系列导出相关系数的数字表达式，并且提起了事件的吝啬的角度的范围限制。而且，当我们从空空间使用了基础向量而不是直角的集合获得一样的系统性能时，分布式的概括分层的空间时间代码(GLST)的体系结构被认为以便完成multiplexing获得和差异获得但是与更低的复杂性。而且，以便最大化能力，Gerschgorin圆基于快天线选择算法包括那些模拟结果的讨论被评估了。

简介：Anovelfibergratingvibrationdemodulationsystem,basedon2×2and3×3couplers,isdesigned.Basedonthephaseunwrappingalgorithm,thethree-wayasymmetricaloutputofthe3×3coupleranddemodulationstatecharacteristicsofthesystemwhenthevibrationsignalincludeshighharmonicwavesareanalyzedinsimulations.Theresultshowsthatwhenthethree-wayoutputisasymmetrical,themaximumdeviationofdemodulationsignalis1.625%,andwhenthevibrationsignalincludeshighharmonicwaves,themaximumdeviationofdemodulationsignalis0.9%.Thecorrespondingexperimentisconducted.Theexperimentalresultshowsthatthedynamicresolutionofthesystemis25.22nε/Hzwhenthevibrationpitchis5.5Hz.

简介：多层的印刷电路董事会(聚氯联苯)的放射排放(RE)将引起电磁的相容性问题。在聚氯联苯的飞机被介绍的为在从力量地面(P/G)减少RE评估去耦电容器的有效性的一个有效数字方法。一个二维的边界元素方法(BEM)被用来建立放射模型。然后，RE被边地的相等的磁性的电流在P/G飞机附近计算。而且，P/G飞机的放射和输入阻抗装了去耦电容器为频率被计算直到5GHz。没有去耦电容器，结果与盒子的那些相比。它证明去耦电容器有效地除了反反响的频率装减少RE。在更高的频率，去耦有效性主要取决于电容器大头针而非价值的寄生电感。

简介：BasedontheanalysisofthespuriousintroducedbyphaseaccumulationtruncationwhichwasmadebyNicholas,anewsimplifiedalgorithmforspuriousspectruminthepresenceofphasetruncationispresentedbyusingthemappingmathematicsandnumbertheoreticmethod,itispossibletopreciselyanalyzethespuriouslocationandthespuriousamplitudeintroducedbyphasetruncationinpracticalapplicationsbycomputer.

简介：Thispaperpresentstheanalysisofopenmicrostripstructuresbyusingdiakopticmethodoflines(ML)combinedwithperiodicboundaryconditions(PBC).Theparametersofmicrostrippatchareobtainedfrompatchcurrentexcitedbyplanewave.ImpedancematrixelementsarecomputedbyusingfastFouriertransform(FFT),andreducedequationissolvedbyusingdiakoptictechnique.Consequently,thecomputingtimeisreducedsignificantly.TheconvergencepropertyofsimulatingopenstructurebyusingPBCandthecomparisonofthecomputertimebetweenusingPBCandusualabsorbingboundarycondition(ABC)showthevalidityofthemethodproposedinthispaper.Finally,theresonantfrequencyofamicrostrippatchiscomputed.Thenumericalresultsobtainedareingoodagreementwiththosepublished.

简介：WiththefastgrowthofChineseeconomic,moreandmorecapitalwillbeinvestedinenvironmentalprojects.Howtoselecttheenvironmentalinvestmentprojects(alternatives)forobtainingthebestenvironmentalqualityandeconomicbenefitsisanimportantproblemforthedecisionmakers.Thepurposeofthispaperistodevelopadecision-makingmodeltorankafinitenumberofalternativeswithseveralandsometimesconflictingcriteria.Amodelforrankingtheprojectsofmunicipalsewagetreatmentplantsisproposedbyusingexports'informationandthedataoftherealprojects.And,therankingresultisgivenbasedonthePROMETHEEmethod.Furthermore,bymeansoftheconceptoftheweightstabilityintervals(WSI),thesensitivityoftherankingresultstothesizeofcriteriavaluesandthechangeofweightsvalueofcriteriaarediscussed.Theresultshowsthatsomecriteria,suchas'proportionofbenefittoprojectcost',willinfluencetherankingresultofalternativesverystrongwhileothersnot.Theinfluencearenotonlyfromthevalueofcriterionbutalsofromthechangingtheweightofcriterion.So,somecriteriasuchas'proportionofbenefittoprojectcost'arekeycriteraforrankingtheprojects.Decisionmakersmustbecautioustothem.

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

简介：据IPC发布的《2015年全球PCB生产报告》估测，2015年全球PCB产值达到586亿美元，比2014年减少了2．7％，除去汇率变动因素和物价变动因素，2015年PCB产值实际增长了2．0％。2016年全球PCB行业预计持续缓慢增长趋势，扣除物件影响因素。在刚性PCB板产量下降的同时，挠性PCB板增长势头迅猛。

简介：7月20日，松下电器（中国）有限公司广播电视系统营销公司在北京召开“引领技术应用革新——BIRTV2015松下新闻发布会”。松下电器（中国）有限公司厂播电视系统营销公司野村一生总经理、谷川秀一副总经理、孙奉明技术总监出席了本次新闻发布会。

简介：为打破集成电路、软件和新型元器件制约中国信息产业发展的瓶颈，信息产业部今日发布《信息产业科技发展“十一五”规划和二0二0年中长期规划纲要》，指出中国将在十三个信息产业重大项目上进行集中攻关。