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123 个结果
  • 简介:Forthepurposesoffloodcontrol,conveyanceofsediment,andadequateutilizationofwaterresourcesintheLowerYellowRiver,theoperationschemeofsedimentregulationonperennialbasisisproposedfortheXiaolangdiReservoi.Waterandsedimentareretainedinthereserviorinnormalandlowwateryears,whileinyearswithabundanceofwater,theyareflushedoutinshortperiodsofreservoirdrawdowntoformhyperconcentratedfloods.TheseremouldthewideshallowreachaboveGaocunintoanarrowdeepchannel,throughwhichthesedimentmaybetransportedallthewaytothesea.Theresults?

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  • 简介:有从50nm变化到600nm的不同厚度的钽薄电影被收音机频率磁控管作为免职温度(T)和偏爱电压(Ub)的功能劈啪作响在Si底层上扔。表面粗糙和它的动态进化行为是使用原子力量显微镜学(AFM)调查的份量上。与从300K增加T到600K,表面粗糙Rrms和动态代表逐渐地减少。随到-150V,Rrms和第一减少的从0V的Ub的增加然后增加。电影表面进化上的T和Ub的依赖以表面散开,墩生长,和离子侵犯效果被讨论了。

  • 标签: 表面进化 半导体 溅射 温度设置
  • 简介:Asimpleroutetosynthesizethepolyaniline(PANI)nanofiberswithdiameterabout150nmwasreported.Inthisstrategy,thePANInanofiberswerefabricatedbyelectrochemicaldepositionbyusingtwo-electrodeconfigurationin0.01Manilineand0.01MH2SO4electrolytes.Theas-preparedmaterialswerecharacterizedbyscanningelectronmicroscopy(SEM),infraredspectroscopy(FTIR),Ramanspectroscopyandthermogravimetricanalysis(TGA).TheelectrochemicalpropertiesofthePANInanofiberselectrodeassupercapacitormaterialswereinvestigated.ThePANInanofiberselectrodeshowedhighcapacitanceof485F·g-1at0.1A·g-1,andthedecreaseinthespecificcapacitanceisabout3.5%in1000cycles.TheresultsindicatethatthePANInanofiberselectrodeshowshighstabilityandretainsitselectrochemicalcapacitancepropertyover1000cycles,suggestingPANInanofibershavepromisingapplicationsinhigh-performancesupercapacitors.

  • 标签: POLYANILINE NANOFIBERS NANOSTRUCTURED ELECTRODES electrochemical capacitors
  • 简介:高密度的CdS空nanospheres被一种简单化学蒸汽免职技术成功地综合。水晶结构,组合信息,和词法结构被X光检查衍射(XRD)描绘,扫描电子显微镜学(SEM),传播电子显微镜学(TEM),和精力散的X光检查分光计(EDX)。结果证明同样准备的CdS空nanospheres让制服缩放大约1在直径的3m。Kirkendall现象为CdSnanostructures的形成被建议。在580nm定位的强壮的排出物被观察。

  • 标签: 化学气相沉积技术 纳米空心球 光致发光特性 硫化镉 合成 扫描电子显微镜
  • 简介:Uniformdiamondfilmsarehighlydesirableforcuttingindustries,duetotheirhighperformanceandlonglifetimeusedoncuttingtools.Nevertheless,theyaredifficulttoobtainoncuttingtoolswithcomplicatedshapes,greatlylimitingtheapplicationsofdiamondfilms.Inthisstudy,anovelapproachofdepositionforuniformdiamondfilmsisproposed,oncircularsawbladesmadeofcementedcarbideusingreflectorsofbrasssheets.Diamondfilmsaredepositedusinghotfilamentchemicalvapordeposition(HFCVD).Anovelconcavestructureofbrasssheetsisdesignedandfabricated,improvingthedistributionoftemperaturefield,andovercomingthedisadvantagesoftheconventionalHFCVDsystems.ThisincreasestheenergyefficiencyofusewithoutchangingthestructureandincreasingthecostofHFCVD.Thegrainsarerefinedandtheintensitiesofdiamondpeaksarestrengthenedobviously,whichisconfirmedbyscanningelectronmicroscopyandRamanspectrarespectively.

  • 标签: 热丝化学气相沉积 金刚石圆锯片 均匀 金刚石薄膜 化学气相沉积系统 硬质合金圆锯片
  • 简介:Amorphoussiliconfilmsarepreparedatlowertemperatureof350℃bynewcatalyticchemicalvapordepositionmethod.Inthemethod,materialgases(SiH4andH2)aredecomposedbycatalyticreactionatgiventemperature,soa-Sifilmsaredepositedonsubstrates.Itisfoundthata-Sifilmswithhighqualitycanbeobtain,suchashighphotosensitivityof10^6,lowspindensityof2.5×10^16cm^-3.

  • 标签: 无定形硅片 气相化学沉积 生长率
  • 简介:Thediffusionandmasstransfer,reaction,integrationandgrowthprocessesofthemetalionsontheactivatedcarbonfibers(ACFs)arediscussed.Basedonthediffusionfilmtheory,thediiffusionandtheintegrationmodelaredevelopedtodescribethedepositionprocessesofmetalionsfromthesolutiontoACFsinthefiuidizedbeds.Themodelofheattransferofthisprocessisestablishedtoexpoundtheimportantrole-playedindepositionprocessesbytheinfluenceofthereactionheatreleasedatACFssurfaceandthenon-uniformtemperaturedistributioncausedbyhydrodynamics.

  • 标签: 金属离子 活性炭纤维 传质 传热 贵金属 吸附剂
  • 简介:TheDevoniansuccessioninSouthChinaiswell-knownforitscompletedevelopment,vari-fiedsedimentarytypes,remarkablelithofaciesvariationandabundantmineralresources.TheSouthChinaplatewasformedbythecollisionandcollageoftheYangtzeplateandtheCathaysianplate.ThecollisionbeganapproximatelyattheJinningianstageandthecollagewasnotfinalizeduntiltheGuangxianmovement.ItwasontheSouthChinaplatewithasomewhatdifferentnatureofthebasementthattheDevoniandepositionformed.

  • 标签: DEVONIAN features of SEDIMENTARY BASINS MINERALIZATION
  • 简介:Inordertoevaluatethevalidityofcommonlyusedformulaedescribingerosionanddepositionofcohesivesedimentsfortheirapplicationwithinnumericalsimulations,acombinedexperimentalandnumericalinvestigationiscarriedout.Anannularflumeisusedforexperimentsonerosionanddepositionofreservoirmuds.Theresultsoftheseexperimentsserveasvalidationdatafortheformulaeinconsideration.Forthisvalidation,theexperimentsarereproducedwithinanumericalsimulation,whichconsistsoftwoparts:Inafirststep,theflowintheannularflumeissimulatedwithina3Dlargeeddysimulation.Theflowfieldsobtainedinthesesimulationsthenserveasinputforthesecondstep,adecoupled2DVsimulationoferosionanddepositionprocessesduringtheexperiments.TheinvestigatedformulaearethoseofPartheniadesandParchure&MehtaconcerningerosionandofKroneandRichardson&Zakiconcerningdeposition.

  • 标签: COHESIVE sediment Erosion Deposition ANNULAR flume
  • 简介:TheTm-Ni-Coalloyfilmshavebeenpreparedbythesweeppotentialdepositiontechnique.ThesurfaceappearanceofTm-Ni-Coalloyfilmswassilver,smoothandadhesive.ThesurfacesofTm-Ni-Coalloyfilmsobservedbyscanningelectronmicroscope(SEM)wereuniform,adhesiveandcompact.Thesizesofmetallicgrainswereabout80-100nm,100-200amorphousasprovenbytheX-raydiffraction(XRD).

  • 标签: 扫描电位沉积 铥镍钴合金 合金镀层 二甲亚砜
  • 简介:Depositionofamorphousparticles,asaprevalentproblemparticularlyinthespraydryingoffruitandvegetablejuices,isduetolow-molecular-weightsugarsandisstronglydependentontheconditionoftheparticlesuponcollisionwiththedryerwall.Thispaperinvestigatestheconditionoftheamorphousparticlesimpactingthewallatdifferentdryingconditionswiththeaimofelucidatingthedepositionmechanismandphysicalphenomenainthedryingchamber.Amodelsucrose-maltodextrinsolutionwasusedtorepresentthelow-molecular-weightsugar.Particledepositswerecollectedonsamplingplatesplacedinsidethedryerforanalysesofmoisturecontent,particlerigidity(usingSEM)andsizedistribution.Moisturecontentwasadoptedasageneralindicatorofstickiness.Productparticlescollectedatthebottomoftheexperimentaldryerwerefoundtohavehighermoisturethanparticledepositsonsamplersinsidethedryer.Moisturecontentprofileinthedryershowsthatapartfromtheatomizerregion,whereparticlesarerelativelywet,particledepositsatotherregionsexhibitsimilarlowermoisturecontent.Atthehighesttemperatureadoptedintheexperiments,particlesbecamerubberysuggestingliquid-bridgeformationasthedominantdepositionmechanism.Furtheranalysisonparticlessizedistributionrevealsaparticlesegregationmechanismwherebysmallerparticlesfollowpreferentiallytothecentralairstreamwhilelargerparticlestendtore-circulateinthechamber,aspredictedinpastCFDsimulation.ThefindingsfromthisworkwillformthebasisandprovidevalidatingdataforfurthermodelingofwalldepositionofamorphousparticlesinspraydryingusingCFD.

  • 标签: POWDER handling AMORPHOUS PARTICLES DEPOSITION Particle
  • 简介:我们准备了graphene氧化物(去)可饱和的吸收器(SA)成功地在光的效果下面通过光免职方法,它是的一条简单却有效的途径扔各种各样的材料到底层上,并且调查了影响光免职结果的几个因素去到光纤维结束上,包括(甲基methacrylate)(PMMA)poly,集中,轻紧张,轻模式,和免职预定。有效光学地扔了去保存它GO/PMMA合成形成保证的非线性也被表明。光免职准备的GOSA分别地与调整深度和6%和40%的nonsaturable损失显示出优异可饱和的吸收性质。

  • 标签: 可饱和吸收 吸收特性 氧化石墨 光学 光纤 聚(甲基丙烯酸甲酯)
  • 简介:活跃的催化的种是否在在CNT或另外的nanowire生长期间的液体,稳固的阶段,表面premelting或表面过程,是争论的。以便为催化地成年的碳nanotube(CNT)探索机制,为在不同温度下面种的CNT的机制尝试性地被建议。与乙醇化学药品蒸汽免职(CVD),碳n.anotubes(CNT)作为催化剂用钴(公司)在Si底层上controllably被综合。CNT生长上的公司粒子尺寸,生长温度和乙醇压力的效果被调查。在生长温度的不同范围的公司粒子尺寸上的CNT生长的不同依赖被发现。

  • 标签: 化学气相沉积 碳纳米管 催化生长 工艺参数 表面处理 生长温度
  • 简介:Thepiezoelectricfilmelectro-depositionforopticalfibersensorwithZnOcoatingisstudied.Thezincoxideplatingfilmismadeonthecoppersurfacedirectlybycathodicelectro-depositionintheZn(NO_3)_2singlesaltaqueoussolutionsystems.TheinfluencesofmainexperimentalconditionsonthepropertiesofZnOthinfilmintheelectro-depositionprocessesareanalyzedandastable,practicalandeconomictechniqueisobtained.

  • 标签: 压电薄膜 电沉积法 光纤 传感器
  • 简介:DedicatedexperimentsintheHT-7tokamakwereperformedtoinvestigatethein-fluenceoferosionanddepositiononthemirrorsamples.Thefirstmirror(FM)samplesmadeofpolycrystalline(PC)stainlesssteel(SS),molybdenum(Mo)andtungsten(W)werefixedonaholderatanangleof45withrespecttothehorizontalplaneandsetatdifferentlocationswithdifferentconnectionlengthsalongthemagneticfield.Theopticalreflectivityofthefirstmirrorwasmeasuredbyaspectrophotometerbeforeandafterplasmaexposure.Itwasfoundthatthesurfacemorphologyandspecularreflectivityofthemirrorsamplesaftertheexposureweredifferentwithrespecttothedifferentdistancesfromthemirrorsurfacetothelastclosedfluxsurface(LCFS)oftheplasmainthetokamak.Itwasalsofoundthatshorteningtheconnectionlengthbeforethemirrorsurfacewouldweakentheinfluenceoftheplasmaerosionandimpuritydepositiononthemirrorsurface.Inordertomaintaintheopticalcharacteristicsofthemirrorsurface,itisnecessarytoadoptthein-situcleaningandmirrorprotectiontechniques.

  • 标签: HT-7托卡马克装置 杂质沉积 侵蚀 镜子 表面形貌 金属