简介：Thephaseandfrequencylockingofmicrowave,millimeterwavepowercombiningwereanalysedandsummarizedinanall-roundway.Themaster/slavephaselockingofcavityoscillators,thepeerphaselockingofmutuallycoupledoscillators,andthepeerphaselockingofring-connectedmultipleoscillatorswereinvestigated.Theresultsofnumericalcalculations,andtherelationsofphasetophaselockingmodelandoscillatorparametersweregiven.Andthecavityandspacepowercombiningaspectsformicrowaveandmillimeterwavewerepresented.

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简介：Studyoftheoxygen-absorptioncoefficientin5mmwavebandisimportantforremotesensingoftheatmospherictemperatureprofilefromsatellitesorground.Inordertoobtaintheatmospherictemperatureprofilerapidlyandaccurately,itisnecessarytohaveasimple,butaccurateformulaoftheoxygen-absorp-tioncoefficient.Inthispaper,formulaeoftheoxygen-absorptioncoefficientinacertainrangeoftempera-ture-pressureandatastandardisobaricsurfacehavebeenderived.TheseformulaemaysubstituteforMeeks-Lilleyformulainremotesensingoftheatmosphere.

简介：Microwaveradiationwasappliedtothedetectionofmetamizoiesodiumbycyclicvoltammetry.TheelectrochemicalcharacteristicsofmetamizoiesodiumwerestudiedbycyclicvoltammetryatGCelectrodeundermicrowaveradiationandaconsiderablecurrentenhancementwasobservedformetamizoiesodiuminaqueous0.05mol/LH_2SO_4.Undertheoptionalconditions,metamizoiesodiumwasdeterminedintheabsenceandpresenceofmicrowaveactivation.Intheabsenceofmicrowaveactivationcyclicvoltammogramofmetamizoiesodiumshowsgoodlinearrelationshipinaconcentrationrangeof8.0×10~(-5)—1.0×10~(-3)mol/Linaqueous0.05mol/LH_2SO_4withadetectionlimitof6.75×10~(-6)mol/L(S/N=3)andtheequationoflinearregressionisI_p=12.973c-0.1905(R~2=0.9996,n=6);inthepresenceof80Wmicrowaveactivationcyclicvoltammogramofmetamizoiesodiuminshowsgoodlinearrelationshipinaconcentrationrangeof4.0×10~(-5)—1.0×10~(-3)mol/Linaqueous0.05mol/LH_2SO_4withadetectionlimitof4.41×10~(-6)mol/L(S/N=3)andtheequationoflinearregressionisI_p=25.107c-0.1193(R~2=0.9973,n=7).Thecurrentinthepresenceof80Wmicrowaveactivationincreasestoabout2ordersofmagnitudecomparedwiththatintheabsenceofmicrowaveactivation.Theproposedmethodinthepresenceofmicrowaveactivationshowedhighselectivityandsensitivity,andthesamplingofthedisposalmethodissimple.ThemethodwasverifiedbythedeterminationofMetamizoieSodiumtabletwithsatisfactoryresults.

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简介：Amassofheatwillbegeneratedinsidethewoodbythedirectinteractionbetweenmicrowaveelectromagneticfiledandwatermoleculeorpolargroupinwood,whichcanbeusedtodrywoodquicklyorforthemodificationpretreatmentofwood.Basedonthephysicallawonheattransfer,amathematicalmodeltodescribethetemperatureprofilesofwoodduringmicrowavedryingwasestablishedandsimulatedinthisresearch.Theresultsshowedthatthetemperatureprofilesanditsuniformityinsidewoodaredependentonthemicrowaveheatingmethodsduringamicrowavedrying.Thetemperatureinsidewoodgraduallydecreasedalongthedirectionofmicrowavetransmissionwhentheunilateralmicrowaveheatingwasappliedduringwooddrying,andthecurveoftemperatureprofilesalongthethicknessdirectionofwoodisnotflat.Thetemperaturegradientwiththeinteriortemperaturehigherthantheoneinthesurfacelayerswaspresentedinsidewoodwhenthebilateralmicrowaveheatingwereappliedforwoodmicrowavedrying.Comparedwiththeunilateralmicrowaveheatingmethod,thetemperaturedistributionismoreuniformalongthethicknessdirectioninsidewoodforthebilateralmicrowaveheating.

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简介：帮助的酸水解作用被建立准备-carra-oligosaccharides的微波的一个快速的方法。最佳的水解作用条件被直角的测试决定。oligosaccharides的聚合(DP)的度被高效检测薄层层析(HPTLC)和polyacrylamide胶化电气泳动(页)。就HPTLC和页的结果而言，微波的最佳条件帮助了酸水解作用被决定。-carrageenan的集中是5mgmL<啜class=“a-plus-plus”>1；反应答案被适应pH3与冲淡盐酸酸；答案为在这些indic燬?燬的15个变化是在在100点的微波照耀下面的hydrolyzed吗？？

简介：Wepresentamethodtogenerateafrequency-doubledmicrowavesignalbyemployingacoupling-modulatedringresonator.CriticalcouplingisachievedwhentheresonatorintrinsiclossisperfectlybalancedbytheexternalcouplingenabledbyaMach–Zehnderinterferometercoupler.Thehighsuppressionofthecarrierleadstoacleantwo-toneopticalsignalwiththefrequencyintervaltwotimeslargerthanthatoftheinputmicrowavefrequency.Thebeatingofthetwo-tonesignalataphotodiodegeneratesthefrequencyupconvertedmicrowavesignal.Atheoreticalmodelisestablishedtoanalyzethemodulationprocessandthemicrowavesignalgeneration.Experimentalresultsshowthattheelectricalharmonicsuppressionratioisaround~20dB(29dB)foraninputmicrowavesignalwith5dBm(10dBm)power.

简介：ＴＨＥＤＩＥＬＥＣＴＲＩＣＰＲＯＰＥＲＴＩＥＳＯＦＨＵＭＡＮＦＥＴＡＬＯＲＧＡＮＴＩＳＳＵＥＳＡＴＲＡＤＩＯＡＮＤＭＩＣＲＯＷＡＶＥＦＲＥＱＵＥＮＣＩＳＥＴＨＥＤＩＥＬＥＣＴＲＩＣＰＲＯＰＥＲＴＩＥＳＯＦＨＵＭＡＮＦＥＴＡＬＯＲＧＡＮＴＩＳＳＵＥＳＡ...

简介：Theexperimentalstudyofultra-wideband(UWB)technology,itsgenerationandon-linemeasurementarepresented.AnexperimentalrepetitiveUWBsystemisdesigned,manufactured,andtested.High-pressuresparkgapswitchanditscomponents,aswellasoilsparkgapswitcharestudiedexperimentallyonthesystem.Experimentalresultsindicatethatthesystemoperatesata200ppsrepetitiveratewithastableperformance.100MWpeakpowerUWBpulsesareobtainedonthesystem.Fast-timeresponsecapacitivedividerisdesignedandfabricated,allowingforanaccuratemeasurementofthehighpowerUWBsignal.ThemainissuesrelatedtothedesignoftheswitchandtheUWBsignalonlinemeasurementarediscussed.

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简介：Inthispaper,MPt/C(M=La,Nd)catalystsofPEMFCweresynthesizedbymicrowaveradiationprocess.ThecrystallinityandstructureofcatalystswererespectivelyanalyzedbyXRDandnitrogenadsorptiontests.Theactivityofcatalystswasinvestigatedbyelectrochemistryexperiment.Theresultsshowedthat:1)comparedwithPt/Ccatalystpreparedbytypicalimpregnation-reductionprocess,thesizeofMPt/CcatalystparticledecreasedandtheavailablecrystalforO2reductionincreased;2)theMPt/CcatalystshadrelativelyhighBETsurfaceareas;and3)thesecrystaltransformationsoftheMPt/Ccatalystbroughthightheelectrocatalyticactivity,andasaresult,improvedthepowerofPEMFC.

简介：Poly(N-vinyl-2-pyrrolidone)(PVP)-stabilizedrutheniumnanorodswithhighaspectratiobyrefluxingruthenium(Ⅲ)chlorideinn-propanolhavebeensuccessfullypreparedbymeansofafacileandrapidmicrowaveheatingforthefirsttime.Thestructureandmorphologyoftheobtainedproductswerecharacterizedbytransmissionelectronmicroscopy(TEM),selectareaelectrondiffraction(SAED),ultraviolet-visiblespectrophotometry(UV-vis),X-rayphotoelectronspectroscopy(XPS)andFouriertransformspectroscopy(FT-IR).XPSanalysisrevealsthatthenanorodswereinthemetallicstate.TEMimagesshowedthatrutheniumnanorodshadanobviousone-dimensionalstructurewiththeaspectratiorangedfrom5to40nmandlengthupto600nm.SAEDpatternsindicatedthatthenanorodsweresingle-crystallinewithahexagonalstructure.

简介：BasedonTianetal.'stheoreticalmodelofmicrowavescattering,byusingthewindwavespectrumsuggestedbyFungetal.,numericalresultsofpolarizedback-scatteringwerecalculated.Thequantitativerelationshipsbetweenthecalculatedbackscatteringcross-sectionandtheenvironmentalparameters,suchaswindspeeds,azimuthalanglesandincidenceangles,werestudied.Comparedwiththetraditionaltwo-scalescatteringmodel,theresultsaremuchmorecoincidentwiththeobservationsundertheconditionofmoderateincidenceangles,whichisveryusefultomakeupforthetwo-scalemodel.Tomakethenewcalculationmodeltobeusedconvenientlyinthepractice,itssimplifiedformwasproposed.

简介：Weproposeanovelphotonictechniqueformicrowavefrequencymeasurementbasedontransversalmicrowavefilterswithhighresolution.Twoparallelmicrowavefilterswithsineandcosinefrequencyresponsesareobtainedbycrossgainmodulationinasinglesemiconductoropticalamplifier,whichintroducestwodifferentfrequencyresponsestoachieveanamplitudecomparisonfunction.Wealsodemonstrateaproof-of-conceptexperiment.Themeasurementerrorislessthan±0.04GHzforthefirstbandrangeof0–3.45GHzandlessthan±0.03GHzforthesecondbandrangeof3.45–5.8GHz.Ourschemeisfoundtobecapableofbeingextendedforlargerfrequencyrangemeasurementsusingashorterfiberlength.

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简介：Theprinciplesandfeaturesofmicrowavesintering,theapplicationinrefractoriesandsynthesismethodsofZrB2arereviewed.ThesynthesisresultsofZrB2bythermitdeoxidatemethodshowthatproductionpriceofZrB2canbeeffectivelyloweredthroughmicrowavesynthesis.ItwillexpandtheapplicationofZrB2inrefractories.