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99 个结果
  • 简介:Theprocessingoffine-grainedparticleswithdiametersbetween1and10micronsisdifficultduetostrongvan-der-Waalsattractionforces.Inordertoimprovethehandlingproperties,thefine-grainedparticles,i.e.host-particles,arecoatedwithvariousnanoparticles,i.e.guest-particles.Themixingoffine-grainedpowdersisinfluencedbyparticle-particleinteractions.Iftheseforcesaredistinctivelyused,bothinteractiveandorderedmixtu.rescanbeproduced.Theseparticlemixturesconsistofcomposite-particlesthathavenewphysicalproperties.Thesemodifiedpropertiesdependstronglyonthecoatingprocess,thediameter-andmass-relationshipoftheguest-andthehost-particles.Thepropertiesofthecomposite-particlescansystematicallybeadjustedtotherequirementsofindustrialapplications.Forexample,alaboratorybubblingfluidizedbedcanbeusedtodescribetheconveyingbehaviorofthefunctionalizedhost-particles.Applicationsforthefunctionalizedparticlesareinthepharmaceuticalandthepowdercoatingindustries,e.g.enhanceddrypowderinhalersandthinlacquerfilms.Thepresentresearchcomparesthreedifferentmixing/coatingprocesses.Thecomposite-particlesarecharacterizedbyTEM,SEMandwiththeirfluidizationcharacteristics.Thecoatingprocessitselfismonitoredbytheelectrostaticchargeoftheparticles.

  • 标签: 颗粒物质 带电纳米粒子 悬浮液 混合方法 范德瓦尔斯引力
  • 简介:粉末的超声的microfeeding是为在稳固的freeforming和药品的dosing的使用的一个新、有希望的方法。在这个工作,用超声的颤动的控制计算机的microfeeding系统一毛状被造。流动和切换的控制的大量控制的、稳定的率在声学的颤动系统被完成,一致粉末剂量在超声的系统被获得。试验性的结果证明那条嘴直径,传播液体深度,波形,电压振幅,频率和摆动持续时间都影响剂量团。在这些之中,因素,嘴直径,电压振幅和摆动持续时间能是过去常控制剂量团的最好。一种人工的神经网络(ANN)技术被使用预言剂量团。基于这些研究结果,microfeeding的四种类型被建议。

  • 标签: 颗粒 超声波 频率 粉末
  • 简介:■Creationisasolitaryendeavor,yetnowandagaintwoartistscometogethertoproduceartthatneithercouldhaverealizedalone.Byallaccounts,LinTianmiaoandWangGongxinhaveprovedtobesuchateam.

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  • 简介:AcomprehensivefieldstudyhasbeenundertakentoinvestigatesedimentresuspensiondynamicsintheMoretonBay,alargesemi-enclosedbaysituatedinSouthEastQueensland,Australia.Aninstrumentedtripod,whichhousedthreecurrentmeters,threeOBSsensorsandoneunderwatervideocamera,wasusedtocollectthefielddataontides,currents,wavesandsuspendedsedimentconcentrationsatfoursites(Sites1,2,4,and5)inthebay.Site1waslocatedatthemainentrance,Site2atthecentralbayindeepwater,andSites4and5attwosmallbaysinshallowwater.Thebedsedimentwasfinesand(d50=0.2mm)atSite1,andcohesivesedimentattheotherthreesites.Basedonthecollectedfielddata,itisfoundthatthedominantdrivingforcesforsedimentresuspensionareacombinationofoceanswellandtidalcurrentsatSite1,tidalcurrentsatSite2,andwind-wavesatSites4and5.Thecriticalbedshearstressforcohesivesedimentresuspensionisdeterminedas0.079PainunidirectionalflowatSite2,and0.076Painwave-inducedoscillatoryflowatSite5.

  • 标签: 沉淀物 再悬浮性 海浪 风浪
  • 简介:为了解决粒子退化现象并且同时避免,取样贫穷,这份报纸为一般大小写基于好采样算法建议了一个改进粒子过滤器,与好采样(PF-FR)作为粒子过滤器打电话。由介绍比较距离的过程并且基于优化联合计划产生新粒子,因此,PF-FR过滤器以粒子系统的有效性和差异两个都比通用采样重要性采样粒子过滤器(PF先生)更好表现在nonlinear/non-Gaussian的状态的显然改善的评价精确性当模特儿。模拟显示建议PF-FR算法能维持粒子的差异并且因此与粒子的更少的数字完成一样的评价精确性。因而,PF-FR过滤器是在非线性的州的评价的应用的一种竞争选择。

  • 标签: 粒子滤波器 采样算法 基础 优化组合方案 状态估计 退化现象
  • 简介:AdataacquisitionsystembasedonLabVIEWisdesignedandimplemented,andelectro-discharge(ED)finetruingofmetal-bondedfine-graindiamondwheelbasedonreal-timemonitoringisresearched.Real-timemonitoringnotonlymakesefficientimpulsespecificationofEDtruingeasilyobtained,butalsoisgoodfortimelyidentifyingno-load,avoidingshortcircuitandarcdischargephenomenaandthenforobtainingnormalmachiningstate.EDfinetruingofthefine-grainwheelincludestwosteps:roughtruingforhighefficiencyandfinetruingforhighprecision.FinalEDtruingprecisionandefficiencynotonlydependonelectricprocessspecification,butalsoisconcernedwithelectrodeshape,insulatedperformanceofoperatingfluidandverticalfeedquantityvalueandfrequency.ExperimentsindicatethatEDfinetruingbasedonreal-timemonitoringcanimprovethetruingprecisionandefficiency.AveragemachiningefficiencyofW10wheelisabout0.95μm/min;thefinalrun-outbyEDtruingislessthan2μm.

  • 标签: 电镀整形 短路电流 电路设计 实时监控 钻石车轮
  • 简介:氢网络管理对refineries.Various重要系统的管理技术被开发了改进精炼厂氢networks.However的效率,所有对待在处理的氢网络费用和油之间的氢网络separately.The折衷的存在方法联网利益没在氢网络管理yet.A小说敏感分析计划被探索被介绍拿把网络处理成处理统一哪个是sensi的consideration.Oil的油

  • 标签: 网络管理 炼油厂 精细化管理 氢气 敏感性分析 石油加工
  • 简介:Theresultsofanexperimentalstudyoninvestigatingthepropertiesofcementitiousrenderingmortarspreparedwitharecycledfineaggregate(RA)werepresented.TheRAwasobtainedfromarecyclingplantinwhichmixeddemolitionwasteswereprocessedbymechanicalcrushing,sievingandsortingoperations.Twoseriesofrenderingmortarmixeswerepreparedwithaconstantwater/cementandaconstantaggregate/cementratiosof0.55and3respectively.Riversandandnaturalcrushedrockfinewereoriginallyusedinthetwoseriesseparately,andtheywereconsistentlyreplacedby25%,50%,75%and100%bytherecycledaggregate.Theexperimentalresultsshowedthatmechanicalproperties,suchascompressivestrength,flexuralstrengthandmodulusofelasticityofthemortarspreparedwiththeRAwerelowerthanthemortarsmadewiththenaturalaggregates.Nevertheless,thebondstrengthattheinterfacebetweenthemortarandmasonrybricksdeterminedbytheTriplettestwasfoundtobehigherforthemortarspreparedwiththeRA.

  • 标签: 再生细骨料 水泥 砂浆性能 制备 渲染 类风湿性关节炎
  • 简介:当好总数被决定,为提高钢炉渣的体积稳定性的合适的方法利用了。在100°C的蒸气处理和在钢炉渣沙的稳固上的2.0MPa下面的压热器处理的效果借助于粉末比率被调查,直线膨胀,压缩、曲折的力量。DTA,EDX,XRD和乙二醇方法被采用分析对待的炉渣和易受影响的扩大谷物。试验性的结果显示那粉末比率,免费石灰满足,直线膨胀的率能表示在不同对待的方法的体积稳定性的改进。蒸气处理过程不能最终阻止标本裂开和用对待的炉渣使集成受到了80°C的热水的压热器做的力量,而是臼的减少直到28d和它的力量不显示出重要减少。免费石灰和方镁石分阶段执行的在灼伤上的水和是为崩溃或裂缝的主要原因未经治疗并且蒸气对待钢炉渣的标本。压热器处理过程是比钢炉渣的体积稳定性的改进上的蒸气处理过程更有效的。

  • 标签: 钢渣 细集料 体积稳定性 蒸汽处理过程 高压处理过程
  • 简介:Theprocessesoffineironorereducedinfluidizedbedhavebeenreviewedinthispaper,thesuperioritiesandlimitationsoftheprocessesofdirectreduction,pre-reductioninfluidizedbedhavealsobeencomprehensivelyanalysed,whichmatcheswithbathsmeltingfurnaceorcokebedtypefurnace.Theanalysishasalsobeenmadeonseveralcontroversialtopics,andthegasuseratiohasbeenpointouttobethekeyofthecompetitionofthereductionprocessinfluidizedbed.Thesuitabilitywithfinalreductionfurnaceisalsoimportanttotheenergysavinginthewholesmeltingreductionprocess.

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  • 简介:Surface-modificationoffineredironoxidepigmentwascarriedoutinanaqueoussolutionofsodiumpolyacrylate.Thesedimentationtimeofmodifiedsamplesinwaterincreasedfrom1.05to264.4hourswhiletheparticlesize(d50)decreasedfrom1.09to0.85μm,andthetintingstrengthincreasedfrom100to115.Thesurface-modificationaswellasthedispersingandstabilizingmechanismsinaqueoussolutionofthesampleswerestudiedbymeansofIR,ThermalanalysisandZetapotential.Theresultsshowedthatthemodifiermoleculesactedonthesurfaceoftheparticlesbychemicalandphysicaladsorption,andaftertheparticlesweredispersedinaqueoussolution,endowingtheparticlesurfacewitharelativelyhighnegativeZetapotential,thusenhancingelectrostaticandstericrepulsionbetweenparticlesfortheireffectivestabilization.

  • 标签: 红色氧化铁颜料 表面处理 吸附 性能 彩色颜料
  • 简介:根据本地平衡模型(LEM),有大RichardsonZaki代表n的好粒子出现,在在床扩大和倒塌期间的某些条件下面,从有小n的粒子的不同动态行为。因为在那里的一个扩大过程可以是从分发者向上宣传的集中断绝,相反,为一个倒塌过程,可以而不是断绝有日益增多地拓宽和向上繁殖的连续转变地区。床高度变化和断绝踪迹的预言试验性地被验证了。

  • 标签: 颗粒物 液体 固体 流化床
  • 简介:Thispaperpresentsanumericalanalysisofgas-solidseparationinarotationaltubeseparator.Thisseparatorwhichcollectsfineparticlesfromgasinlaminarflowiseffectiveforfineparticleseparation.TheseparationefficiencyandcriticalparticlediameteroftheseparatorweresimulatedusingCFDpackage(FLUENT6.0).Thesimulationshowedthatseparationefficiencycanbesignificantlydecreasedduetothepresenceofturbulence.ThesimulationalsoshowedthattheSaffmanliftforcehaslittleeffectontheefficiencyofthisseparator.Thecriticalparticlediameterofthistubeseparatorwasalsocalculatedtheoretically.Someexperimentaldatawereprovidedtovalidatethesimulationresults.Comparisonbetweenexperimentalresultsandsimulationpredictionsonseparationefficiencyshowedsatisfactoryagreement.

  • 标签: 粒子分离 数字仿真 离析器 粒子直径
  • 简介:Thisletterproposesanefficientwavelet-basedFineGranularityScalable(FGS)codingscheme,wherethebaselayerisencodedwithanewlydesignedwavelet-basedcoder,andtheenhancementlayerisencodedwithProgressiveFineGranularityScalable(PFGS)coding.Thisalgorithminvolvesmulti-framemotioncompensation,rate-distortionoptimizingstrategywithLagrangiancostfunctionandcontext-basedadaptivearithmeticcoding.Inordertoimproveefficiencyoftheenhancementlayercoding,animprovedmotionestimationschemethatusesbothinformationfromthebaselayerandtheenhancementlayerisalsoproposedinthisletter.Thewavelet-basedcodersignificantlyimprovesthecodingefficiencyofthebaselayercomparedwithMPEG-4ASP(AdvancedSimpleProfile)andH.26LTML9.ThePFGScodingisasignificantimprovementoverMPEG-4FGScodingattheenhancementlayer.Experimentsshowthatsinglelayercodingefficiencygainoftheproposedschemeisabout2.0-3.0dBand0.3-1.0dBhigherthanthatofMPEG-4ASPandH.26LTML9,respectively.Theoverallcodingefficiencygainoftheproposedschemeisabout4.0-5.0dBhigherthanthatofMPEG-4FGS.

  • 标签: 波形编码 对称编码 FGS 图像编码 H.26L MPEG-4