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122 个结果
  • 简介:Thegenerationofplasmawhichcanabsorbmicrowavesiscurrentlyaresearchtopicofinterest.Thiskindofplasmaisoftenproducedbythedischargeorelectron-beamimpactofnoblegases.Inthispaperanalternaticeapproach,combustionplasma,isstudied.Theplasmaisproducedbycombustingsolidgrainspreparedspecially.Sixgroupsofpowdersweremadeandusedtogeneratetheplasma.Thetransmissivityofthewaveinplasmawasmeasuredbyemployingamicrowavescalarnetworkanalysersystem.Inaddition,theelectrondensityandthecollisionfrequencyoftheplasmawereexaminedbymicrowavedouble-frequencydiagnosis.Themeasurementresultsshowedthattheplasmacouldabsorbmicrowavesremarkablywithanaveragetransmissionattenuationbeingmorethan18dBinafrequencyrangeof2GHzto15GHz.Thediagnosisindicatedthattheelectrondensityoftheplasmavariedfrom10~(17)m~(-3)to10~(19)m~(-3)andthecollisionfrequencywasabout5×10~(10)s~(-1).

  • 标签: 碰撞等离子体物理 微波 相互作用 吸收
  • 简介:IntroductionAlthoughtheapplicationofmicrowavetechniquehasbeenreportedasanewtypeofenergysourcechemically,itisonlyinrecentyearsthatthistechniquehasbeenusedastheenergysourcefororganicsynthesis.In1986,R.Gedye,etal.,publishedthereportofthebenzoatesynthesisfromtherespectivereactionsbetweenbenzenecarboxylicacidandmethanol,propanolorbutanolundermicrowaveheatingandthecatalysisofH2SO4.

  • 标签: MICROWAVE HEATING ESTERIFICATION
  • 简介:Abstract:Theprincipleofprocessingpoppedricecake,especiallybymicrowave,wasexpounded.Thentherelationsbetweenpoppingtime,materialsratio,H20contentofbiscuit-baseandthecrispdegreeandpoppingdegreeofricecakewerediscussed.Themicrowavepoppingandoil-frypoppingwerecomparedaswell.

  • 标签: 米饼 微波炉 制作方法 原料处理 PD
  • 简介:Industrialapplicationofmicrowave,asaheatingsourceformaterialprocessing,wasreviewed.Thefeasibilityofcarbothermicreductionofzincoxideconcentrate,aswellastheeffectofoperatingparameterswasinvestigated,usingahomestylemicrowaveovenat2.45GHz.Zincoxideconcentratedoesnoteffectivelyabsorbmicrowaveenergy,whileanysourceofcarbon,whichisusedasthereductionagent,absorbsmicrowaveenergyverywell.Inthisrespectcokebreezewasfoundtobethebest,andthus,cokewasusedbothasthereducingagentandtheabsorbentofmicrowaveenergy.Itwasalsofoundthatanyincreaseinthecarboncontentandsize,increasesthereductionrate.Increasingthemicrowavepowerandthesizeofthesamplecouldalsoincreasethereductionrate.Furtherinvestigationshowsthatwhenzincoxideisexposedtothemicrowaveforsometime,therateofthereductionbyconventionalmethodincreases.

  • 标签: 微波能量 氧化锌 碳热 材料处理
  • 简介:Evason3c是著名的LightWave插件开发商。其独有的投影渲染(PrcjectiveRendering)技术基于一种先进的相机类型.可以把用户定义的多边形对象渲染成为UV纹理贴图。在此技术基础上开发的LightWave插件MicroWave.则可以看作虚拟3D扫描仪.它可以“扫描”场景中的任何物体.将其渲染为纹理贴图。

  • 标签: 渲染 插件开发 纹理贴图 用户定义 扫描仪 场景
  • 简介:与NOLM切换的微波photonic上的XPM的影响被能解决联合非线性的Schr的裂口步Fourier方法(SSFM)分析?dinger方程(CNLSE)。模拟结果证明XPM导致波形的失真和方面脑叶的漏缝。并且调整带宽越大,方面脑叶的漏缝是越多larger。而且,因为导致XPM的nonreciprocity,NOLMTm的力量传播功能被弄歪:当时,Tm减少couplerf鈭?的切开的比率0,0.5)并且增加什么时候f鈭?0.5,1)。CLC数字O451这研究被中国(号码60272048)的国家科学基金支持,为上海的优秀教师讲师的特殊科学基础。

  • 标签: 微波光子开关 傅立叶法 SCHRODINGER方程 带宽调制
  • 简介:Theapplicationofmicrowaveremotesensingtechnologyinrock mechanicsNai-GuangGENG(耿乃光);Zheng-FangFAN(樊正芳);Quan-QuanJI(籍全权);Cheng-...

  • 标签: ROCK MECHANICS REMOTE SENSING microwave radiation
  • 简介:Theapplicationofmicrowavetechniqueinthehydrometallurgyofnickellateriteoreswasdescribed.Themixtureofnickellateriteoresandsulfuricacidwaspre-treatedbymicrowaveirradiation.Thedissolvingofnickelwasconductedinhotwaterattheatmosphericpressure.Theeffectsoffactors,suchasmicrowavepower,microwaveirradiationtime,andsulfuricaciddosage,wereinvestigated.Inmicrowavefield,themigrationofionicspeciesand/orrotationofdipolarspeciespromotetheliquid?solidreactionprocessduetotheincreasedcontactareaofreactantsandleachingreactionrateconstant.Thankstothestrengtheningactionofmicrowave,themicrowave-assistedleachingprocesshasitsadvantages,suchashigherextractingratethanconventionalatmosphericleaching,andnoneedforhigh-pressureoperationashighpressureacidleaching(HPAL).Theferricironinleachingsolutioncouldbeeffectivelyremovedbysodiumjarositeprocesswithalittlelossofnickelinthejarositeprecipitate.

  • 标签:
  • 简介:Inordertoimprovetheinterpretationoftheearthsystemmicrowaveremotesensing,theresearchofmicrowavespectrumcharacteristicsofthegroundtruth(earthobjects)wascarriedoutinlaboratory.Alaboratoryformicrowaveremotesensingoftheearthobjectshasbeenconstructedtoimprovetheremotesensinglevel,thelaboratoryconsistsoffourparts:themeasuringsystemofdielectricconstants,themicrowaveemissivitymeter,themicrowavereflectometerandthemicrowaveremotesensingsimulationexperimentinfield.Inthispaper,theprincipleofmeasurement,thecorrectionofnearfieldprocess,thestructureofinstrument,thecalibrationmethodandthemeasurementoftheearthsubstances,includingsoil,waterandoil,arediscussed.Thelabora-torymaysupplytheconditionformeasuringtheparametersofthcearthsubstanceremotesensingandhelptointerprettheremotesensingdata.

  • 标签: MICROWAVE remote SENSING ground TRUTH MICROWAVE
  • 简介:Theenergytransmissionofthelongmicrowavepulseforthefrequencyof2.45GHzand5.8GHzisstudiedbyusingtheelectronfluidmodel,wheretheratecoefficientsarededucedfromtheBoltzmannequationsolvernamedBOLSIG+.Thebreakdownthresholdsfordifferentairpressuresandincidentpulseparametersarepredicted,whichshowgoodagreementwiththeexperimentaldata.Belowthebreakdownthreshold,thetransmittedpulseenergyisproportionaltothesquareoftheincidentelectricfieldamplitude.Whentheincidentelectricfieldamplitudehigherthanthebreakdownthresholdincreases,thetransmittedpulseenergydecreasesmonotonouslyatahighairpressure,whileatalowairpressureitfirstdecreasesandthenincreases.Wealsocomparethepulseenergytransmissionforthefrequencyof2.45GHzwiththecaseof5.8GHz.

  • 标签: 能量传输 微波脉冲 空气击穿 BOLTZMANN 击穿阈值 脉冲能量
  • 简介:Inthispaperweusea10-layerradiationtransfermodeltosystematicallyinvestigatetherelationbetweenbrightnesstemperatureandtherainfallratesat37GHz,includingvariousviewingofmicrowave(MW)remotesensinganddifferentsurfacecondition,withmainfocusontheinfluenceofthestructureofice-phaselayer.Theresultsshowthatthequantitativerainfallmeasurementcannotbereliablyobtainedoverthelandfromspuceborneradiometeratthiswavelengthandthestructuresoficelayerareveryimportantindeterminingthe"observed"brightnesstemperatureforthespaceborneMWremotesensing.

  • 标签: viewing BRIGHTNESS systematically determining RADIOMETER PRECIPITATION
  • 简介:Multipaction,causedbythesecondaryelectronemissionphenomenon,hasbeenachallengeinspaceapplicationsduetotheresultingdegradationofsystemperformanceaswellasthereductionintheservicelifeofhighpowercomponents.Inthispaperwereportanovelapproachtorealizeaneffectiveincreaseinthemultipactionthresholdbyemployingmicro-poroussurfaces.Twomicro-porousstructures,i.e.,aregularmicro-porousarrayfabricatedbyphotolithographypatternprocessingandanirregularmicro-porousarrayfabricatedbyadirectchemicaletchingtechnique,areproposedforsuppressingthesecondaryelectronyield(SEY)andmultipactionincomponents,andthebenefitsarevalidatedboththeoreticallyandexperimentally.Thesesurfaceprocessingtechnologiesarecompatiblewiththemetalplatingprocess,andoffersubstantialflexibilityandaccuracyintopologydesign.Thesuppressioneffectisquantifiedforthefirsttimethroughtheproperfittingofthesurfacemorphologyandthecorrespondingsecondaryemissionproperties.Insertionlosseswhenusingthesestructuresdecreasedramaticallycomparedwithregularmillimeter-scalestructuresonhighpowerdielectricwindows.SEYtestsonsamplesshowthatthemaximumyieldofAg-platedsamplesisreducedfrom2.17to1.58fordirectlychemicaletchedsamples.MultipactiontestingofactualC-bandimpedancetransformersshowsthatthedischargethresholdsoftheprocessedcomponentsincreasefrom2100Wto5500Wforphotolithographypatternprocessingand7200Wfordirectchemicaletching,respectively.Insertionlossesincreasefrom0.13dBtoonly0.15dBforbothsurfacetreatmentsinthetransmissionband.Theexperimentalresultsagreewellwiththesimulationresults,whichoffersgreatpotentialinthequantitativeanti-multipactiondesignofhighpowermicrowavecomponentsforspaceapplications.

  • 标签: 高功率微波器件 空间应用 微放电 抑制方法 化学蚀刻技术 次级电子发射
  • 简介:Objective:Toinvestigatetheefficacyofcombina-tionofcircumcisionandmicrowaveongenitalwartsinuncircumcisedmen.Methods:Arandomized,prospectivestudyof109uncircumcisedadultmenwithgenitalwartswascon-ductedinaSTDclinicinZhanjiang,Guangdong.Onegroup(n=54)receivedmicrowavetherapyonly,whiletheothergroup(n=55)wastakenthecombinationofcircumcisionandmicrowavetherapy.Therecurrenceswereobservedattheendofmonths3,6and12,andoperativecomplicationswerealsorecorded.Results:Therewerenosignificantdifferencesinthemeanageanddurationofthediseasebetweentwogroups(P>0.05).Noseriousoperativecomplicationsweredocumented.Therecurrencerateincircumci-sionplusmicrowavegroupwasmarkedlylowerthanthatinmicrowavegroup(12.7%vs29.6%,P<0.05),whilethedifferencesinearlyandlaterecurrencesbetweentwogroupsshowednostatisticalsignificance(P>O.05).Conclusion:Circumcisioncanbesafelyperformedunderlocalanesthesiainanoutpatientsetting.Com-binationofcircumcisionandmicrowavecanproduceexcellenteffectaswellaslesstissuedamage,therefore,itmaybeidealforuncircumcisedpatientswithextensivecondvlomas.

  • 标签: 尖锐湿疣 包皮环切术 微波疗法 临床疗效
  • 简介:钕做了金轧镓氧化物(Nd:GGG)当燃料被报导,nanopowders用丙氨酸由微波胶化燃烧综合了。有丙氨酸燃料的金属硝酸盐答案是在微波的combusted给先锋。微波先锋粉末从800~1100°C在不同温度被锻烧。分阶段执行纯Nd:GGG形成在由X光检查衍射(XRD)和Fourier变换观察了的800~1100°C发生了红外线(FTIR)光谱学。然而,粒子尺寸在1100°C在800°C从25nm与锻烧温度增加了到200nm。Nd:在不同锻烧温度获得的GGGnanopowder被压缩并且在为在空中的3h的1550°C的sintered。最使增加密度陶器从Nd被获得:在1100°C锻烧的GGGnanopowder。从扫描电子显微镜学(SEM)观察了的微观结构证明大多数使增加密度陶器,从在更高的锻烧温度锻烧的nanopowder获得了,有更一致的谷物尺寸分布,更少毛孔和更大的densification。sintered样品的XRD显示出阶段纯净的保留。

  • 标签: 纳米粉体 燃烧合成 GGG 微波 烧结 凝胶
  • 简介:为微波photonic过滤器的一个一般理论模型基于多波长光来源和散媒介被总结并且介绍,并且被用于double-laser-based微波photonic槽口过滤器鈥?性能的分析。双边带(DSB)的不同影响调整并且单个边带(SSB)调整理论上被表明并且解释。而且,不同因素的影响微波photonic槽口过滤器的表演上的3dB带宽和光谱振幅失配例如频率间距,是也学习了。数字模拟结果在对预言的好同意,并且能为微波photonic过滤器的未来优化有益。CLC数字TN253这个工作被浙江省的科技系partically支持(资助没有。R104154)。

  • 标签: 光纤元件 微波纤维 激光 扩散技术
  • 简介:Desorptionofvolatileorganiccompounds(VOCs)frompolymericadsorbentsbymicrowavewasinvestigatedexperimentally.Twokindsoforganiccompounds,benzeneandtoluene,wereseparatelyusedasadsorbatesinthiswork.Resultsshowedthattheapplicationofmicrowavetoregeneratethepolymericadsorbentsnotonlycangethigherregenerationefficiencyincomparisonwiththeuseofheatregeneration,butalsomakethetemperaturesofthefixedbedsmuchlowerthanthatwhenusingtheheatregenerattonTheweakerthepolarityofapolymericadsorbent,theeasieritsregenerationwas.

  • 标签: 聚合吸附剂 解吸 挥发性有机化合物