简介:综述了国内外快放电直线型变压器驱动源(fastlineartransformerdriver,FLTD)闪光照相加速器的研究进展,包括美国圣地亚国家实验室(SandiaNationalLaboratory,SNL)双轴7MVLTD型闪光照相装置、洛斯·阿拉莫斯国家实验室LANSCE装置C区与质子照相装置轴垂直的LTD型闪光照相装置、21级串联LTD-MinorURSA装置及32级串联正负极性可调的LTD装置的概念设计。同时,介绍了法国原子能部CEA/PAM8MVLTD型照相装置IDERIX和英国原子能武器中心为替代Mevex加速器拟研制的空气绝缘LTD的概念设计。最后,介绍了中国工程物理院和西北核技术研究所FLTD相关研究进展,结合西北核技术研究所现有技术条件和需求,提出了开展闪光LTD驱动源的初步设想。
简介:TheextendedRiccatimappingapproachisfurtherimprovedbygeneralizedRiccatiequation,andcombineitwithvariableseparationmethod,abundantnewexactcomplexsolutionsforthe(2+1)-dimensionalmodifieddispersivewater-wave(MDWW)systemareobtained.Basedonaderivedperiodicsolitarywavesolutionandarationalsolution,westudyatypeofphenomenonofcomplexwave.
简介:Awatt-classbackwardwaveoscillatorisproposed,usingtheconcisesinewaveguideslow-wavestructurecombinedwithapencilelectronbeamtooperateat220GHz.Firstly,thedispersioncurveofthesinewaveguideiscalculated,then,theoscillationfrequencyandoperatingvoltageofthedevicearepredictedandthecircuittransmissionlossiscalculated.Finally,theparticle-in-cellsimulationmethodisusedtoforecastitsradiationperformance.Theresultsshowthatthisnovelbackwardwaveoscillatorcanproduceover1-Wcontinuouswavepoweroutputinafrequencyrangefrom210GHzto230GHz.Therefore,itwillbeconsideredasaverypromisinghigh-powermillimeter-wavetoterahertz-waveradiationsource.
简介:Intheprocessofdevelopingandadjustingtheproductinthisproject,weneedsomesignalsources,whichusuallyaffordsquareorsinewave.Generallythesquarewareisusedfordigitlogic,butfortheanalogsignalwaveisusedtojudgethelinearity'squalitiesandotherfunctionsoftheelectriccircuit.Howeverthecommonready-madesignalsourceisallunidirectionalsinewave,thesignalsourceswhosephaseshiftcanarbitrarilyberegulatedandwhichhaveprecisephasearestillnotavailableonethecurrentmarket.
简介:Wepresentacontinuous-wavesingly-resonantopticalparametricoscillatorwith1.5%outputcouplingoftheresonantsignalwave,basedonanangle-polishedMgO-dopedperiodicallypoledlithiumniobate(MgO:PPLN),pumpedbyacommercialNd:YVO4laserat1064nm.Theoutput-coupledopticalparametricoscillatordeliversamaximumtotaloutputpowerof4.19Wwith42.8%extractionefficiency,acrossatuningrangeof1717nminthenear-andmid-infraredregion.Thisindicatesimprovementsof1.87Winoutputpower,19.1%inextractionefficiencyand213nmintuningrangeextensionincomparisonwiththeopticalparametricoscillatorwithnooutputcoupling,whileattheexpenseofincreasingtheoscillationthresholdbyafactorof~2.Moreover,itisconfirmedthatthefiniteoutputcouplingalsocontributestothereductionofthethermaleffectsincrystal.
简介:Wedemonstratetheefficientgenerationofcoherentlightinafour-leveldouble-cascadeatomicmediumbycontinuous-wavelow-intensitylaserradiation.Wederivethecorrespondingexplicitanalyticalexpressionsforthegeneratedfour-wavemixing(FWM)field.DependenciesoftheintensityofthegenerateFWMfieldonthepropagationdistance,ontheinput-waveintensity,andonthephotondetuningareinvestigated.Toconclude,wealsogiveabriefdiscussionontheexperimentalrealizationoftheproposedscheme.
简介:Theobjectiveofthispaperistocomparetheperformancesoftheturbines,whichcouldbeusedforwaveenergyconversioninthenearfuture,undervariousirregularwaveconditions.Theturbinesincludedinthepaperareasfollows:(1)Wellsturbinewithguidevanes;(b)impulseturbinewithself-pitch-controlledguidevanes;(c)impulseturbinewithfixedguidevanes.Inthisstudy,experimentalinvestigationswerecarriedouttoclarifytheperformancesoftheturbinesundersteadyflowconditions,andthenanumericalsimulationwasusedforpredictingtheperformancesunderirregularwaveconditionswithvarioussignificantwaveheights.Asaresult,itwasfoundthattherunningandstartingcharacteristicsoftheimpulseturbinescouldbesuperiortothoseoftheWellsturbine.
简介:在一个thermoacoustic声波发电机的摆动的流动被描述。thermoacoustic声波发电机在thermoacoustic设备起一个重要作用。在工作液体的工作液体和栈,加速和减速之间的热交换并且粘滞在栈并且在回声试管影响的磨擦损失thermoacoustic声波生成器的性能。特别地,摆动的流动显著地影响在工作液体和栈之间的热交换机制。在压力和速度的时间的变化是在回声试管内的正弦曲线。流动就在试管插头后面形成一口摆动的喷气,并且在回声试管外面下游地远变得断断续续。0.63R的无限制的修正,也就是说尽管有在试管插头外面,被速度大小证实并且流动,摆动的流动特征下游地被维持的区域可视化。另外,他们几乎等于听觉的理论结果。关键词thermoacoustic现象-声波生成器-摆动的流动CLC数字TK11.4