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500 个结果
  • 简介:Ore-cokemixedchargingisapotentialtechniqueforoptimizingthechargingpattern.Recently,thechargingofsmall-sizedcoke(nutcoke)withtheferrousburdenlayerhasbeenappliedtoreducerawmaterialusageanddecreasecosts.Variousstudiesindicatethatmixingnutcokewithferrousburdencanenhancethereductionkinetics,improvethesofteningandmeltingproperties,andhaveapositiveeffectonthepermeability.Althoughmixedcharging,especiallytheadditionofnutcoketotheburdenlayer,hasbeenusedintheindustryforvariousreasons,themechanismsandsideeffectsforusingnutcokearenotwellunderstood,andthemixingratioremainslimitedinactualblastfurnaceoperation.High-temperatureexperimentalstudieswereconductedtoincreasetheunderstandingofthecomplexprocessofreduction,softeningandmeltingproperties,andpermeabilityinablastfurnacewhenmixingnutcokewithanorelayer.Theeffectofthenutcokemixingratioandnutcokesizewasinvestigatedundervariousreducingconditions.Todescribethereductionprocessesofburdenmaterials,numerousexperimentswereinterruptedatdifferentstagesofthereduction,andthecollectedmaterialswereexaminedbyusingimageanalysis.Thereductiondegreeofmixedcharging(ironoremixingwithnutcoke)wasimprovedwhenusingnutcokeatthetemperaturesof800℃andabove.Thereactionrateofore-nutcokemixedchargingwashigherthanthatofstandardchargingwithouttheuseofnutcoke.

  • 标签: 炼铁高炉 坚果 还原行为 充电模式 材料用量 熔融特性
  • 简介:在海洋的结构合成的增强的眼镜纤维的使用正在变得更普通,特别地由于潜在的重量积蓄。在增强的聚合物(GRP)上层建筑和钢壳形成了的眼镜纤维之间的关节的机械反应被检验并且随后修改了通过当模特儿并且测试的一个联合程序改进性能。一个有限元素的模型被开发预言关节的反应。模型在在不同材料,进步损坏,大变丑理论,和一种非线性的压力紧张关系之间的接口考虑接触。预言进步失败,分析联合Hashin失败标准和最大的压力失败标准。结果表演压力反应在力量上有大影响并且关节适用。Balsawood钢接口被证明对关节的机械行为批评。在试验性的结果和数字预言之间的好同意被观察。

  • 标签: 玻璃纤维增强复合材料 力学行为 钢铁 纤维增强聚合物 有限元模型 船舶
  • 简介:Thispaperdescribesaseriesofexperimentalinvestigationsonseventeenspecimensofsteelreinforcedconcretespecialshaped(SRCSS)columnsunderlowcyclicreversedloadingusingparallelcrossheadequipment.NineT-shapedSRCcolumns,fourL-shapedSRCcolumnsandfour+-shapedSRCcolumnsweretestedtoexaminetheeffectsofshapesteelconfiguration,loadingangle,axialcompressiveratioandshear-spanratioonthebehavior(strength,stiffness,energydissipation,ductility,etc.)ofSRCSScolumnspecimens.Thefailuremodesandhystereticperformanceofallthespecimenswereobtainedinthetests.Testresultsdemonstratethattheshear-spanratioisthemainparameteraffectingthefailuremodesofSRCSScolumns.Thespecimenswithsmallshear-spanratioarepronetoshearfailure,andtheprimaryfailureplanesinSRCSScolumnsareparalleltotheloadingdirection.Asaresult,thereisasymmetrybetweenpositiveandnegativeloadingdirectionsinthehystereticcurvesoftheSRCSScolumns.Themajorityofdisplacementductilitycoefficientsforallthespecimensareover3.0,sothattheSRCSScolumnsdemonstrateabetterdeformationcapacity.Inaddition,theequivalentviscousdampingcoefficientsofallthespecimensaregreaterthan0.2,indicatingthattheseismicbehaviorofSRCSScolumnsisadequate.Finally,thesuperpositiontheorywasusedtocalculatethelimitsofaxialcompressiveratioforthespecimens,anditisfoundthatthetestaxialcompressiveratioisclosetoorsmallerthanthecalculatedaxialcompressiveratiolimit.

  • 标签: steel REINFORCED CONCRETE special-shaped(SRCSS) co
  • 简介:在沥滤的Pb之间的关系当在它的团结的形式的水泥在酸媒介被沥滤时,有时间的集中和答案pH被分析。团结的形式,增加方法的水泥,和Pb团结上的水和度的粒子尺寸的效果也被调查。试验性的结果显示水泥快速被溶解,形成有好吸附的C-S-H胶化或硅的酸大音阶的第五音并且在酸媒介含水。当cement-Pb团结了时,形式在一个醋酸盐答案被沥滤,含水的产品与时间侵蚀,Pb集中因此在开始稍微增加。然后,一些Pb离子被最新产生的硅的酸大音阶的第五音吸收,C-S-H。其它生产Pb(哦)为第二等的团结的2降水,在超过二个小时的一沥滤的时间在Pb集中导致渐渐的减少。而且,团结的形式的粒子尺寸在Pb溶解上有重要效果。当增加的水泥的数量是低的时,与不到9.5的pH,团结影响原来的水泥粉末的顺序,水泥含水的粉末,和cement-Pb团结了形式。当水泥的增加的数量与超过11的pH增加时,在团结上增加方法的效果减少,并且团结的形式比其它好一些。

  • 标签: 水泥固化体 重金属铅 酸性介质 浸出特性 C-S-H凝胶 凝固形态
  • 简介:Therecenttrendofvehicledesignaimsatcrashsafetyandenvironmentally-friendlyaspect.Forthecrashsafetyaspect,theenergyabsorbingmembersshouldabsorbcollisionenergysufficientlybutfortheenvironmentally-friendlyaspect,thevehiclestructuremustbelightweightinordertoimprovethefuelefficiencyandreducethetailgasemission.Therefore,thelightweightofvehiclemustbeachievedinasecuringsafetystatusofcrash.Analuminumorcarbonfiberreinforcedplastics(CFRP)isrepresentativeoneofthelight-weightmaterials.BasedontherespectivecollapsebehaviorofaluminumandCFRPmember,thecollapsebehaviorofhybridthin-walledmemberwasevaluated.ThehybridmembersweremanufacturedbywrappingCFRPprepregsheetsoutsidethealuminumhollowmembersintheautoclave.BecausetheCFRPisananisotropicmaterialwhosemechanicalproperties,suchasstrengthandelasticity,changewithitsstackingcondition,theeffectsofthestackingconditiononthecollapsebehaviorevaluationofthehybridthin-walledmemberweretested.Thecollapsemodeandenergyabsorptioncapabilityofthehybridthin-walledmemberwereanalyzedwiththechangeofthefiberorientationangleandinterfacenumber.

  • 标签: 行为评价 薄壁 混合 堆放 碳纤维复合材料 能量吸收能力
  • 简介:Investigationsonthepyrolysisandkineticbehaviorsduringpyrolysisoffossilfuelsamples,suchascoal,arefundamentalfordevelopingtherelatedtechnologyandpracticalapplication.Inthiswork,pyrolysisbehaviorandkineticsinthepyrolysisprocessofacoalsamplewereinvestigatedbythethermogravimetricanalyzerataheatingrateof10,40,70,100,200,and500°C/min,respectively.ThepyrolysisprocesscouldbedividedintofourstagesaccordingtotheTG/DTGcurves.Thefirststagewasmainlyattributedtotheremovalofvolatiles,andthesecondpeakwasthepolycondensationreactionbetweenthevolatilecomponents.Itwasfoundthatmorevolatilescouldbereleasedfromcoalduringpyrolysisathigherheatingrateandthehigherpyrolysistemperaturewasnecessaryforarapidpyrolysisprocess.Kineticanalysisrevealedthatboththemodel-free(KASandFWO)andtheCoats-Redfernmethodsweresuitabletodescribingthepyrolysisprocess,andthevariationofactivationenergy(E)withthetwotypesofkineticmodelswasconsistentduringthewholepyrolysisprocess.Furthermore,theheatingratedidnotalterthereactionsequenceofthewholepyrolysisprocess,buthigherheatingratecouldmaketheEvalueoftheinitialpyrolysisstagesmaller.

  • 标签: PYROLYSIS BEHAVIOR KINETIC analysis TG/DTG CURVES
  • 简介:在半翅类昆虫ans的阴唇的顶上被发现的表皮的感觉受体在他们的喂的行为起一个重要作用。在这研究,我们在臭虫错误的阴唇顶上描述sensilla的超微结构,号码,和分发,Blissusleucopterusleucopterus。阴唇上的sensilla的每个顶端的领域包含11uniporous木钉sensilla和一sensillumchaeticum。uniporous木钉sensilla被把树突放入各个的腔的双极的神经原钉木钉的4-5刺激。三个神经原与每sensillumchaeticum被联系,二个神经原在sensillum的库在管状的身体在sensillum,和第三树突结束的腔有树突。包含感觉受体的化学阻塞的行为的测试在喂行为显示出唇音sensilla的重要性。词法、行为的证据显示唇音sensilla让chemosensitive工作。

  • 标签: 行为实验 臭虫 电子显微镜 半翅目
  • 简介:Thesynthesisandphasebehaviorofaseriesof4’-alkyloxy-4-hydroxybiphenylswerediscribed.Theeffectsofreactionconditionsontheyieldsofproductswereinvestigated.Thecharacterizationsofthermotropicliquidcrystallineproductsforthetypeandthermalpropertiesarediscussedthroughtheuseofdifferentialscanningcalorimetry,polarizingmicroscopy.

  • 标签: crystalline ATTRACTIVE spectrometer PHOTOGRAPH CALORIMETRY melting
  • 简介:ThespinesofpencilandlanceurchinsHeterocentrotusmammillatusandPhyllacanthusimperialiswerestudiedasamodeloflight-weightmaterialwithhighimpactresistance.Thecomplexandvariableskeletonconstruction("stereom")ofbodyandspinesofseaurchinsconsistsofhighlyporousMg-bearingcalciumcarbonate.Thisbasicallybrittlematerialwithpronouncedsingle-crystalcleavagedoesnotfracturebyspontaneouscatastrophicdevicefailurebutbygracefulfailureovertherangeoftensofmillimeterofbulkcompressioninstead.Thiswasobservedinbulkcompressiontestsandbluntindentationexperimentsonregular,infiltratedandlatexcoatedseaurchinspinesegments.MicrostructuralcharacterizationwascarriedoutusingX-raycomputertomography,opticalandscanningelectronmicroscopy.Thebehaviorisinterpretedtoresultfromthehierarchicstructureofseaurchinspinesfromthernacroscaledowntothenanoscale.Guidelinesderivedfromthisstudyseeceramicswithlayeredporosityasapossiblebiomimeticconstructionforappropriateapplications.

  • 标签: sea URCHIN URCHIN SPINES biominmitic mechanical
  • 简介:在异例察觉,挑战是怎么为一个用户的动态行为建模。许多以前的工作基于固定长度模型代表用户行为。克服他们的缺点,我们与可变长度的序列的状态基于分离时间的Markov链(DTMC)建议一个新奇方法。方法第一产生不同长度的多重壳命令溪流并且把他们合为一般序列的图书馆。然后,状态根据一个有效用户的可变长度的行为的模式被定义,它改进用户介绍的精确和适应性。随后,转变概率矩阵被创造。以便减少计算复杂性,分类价值仅仅由转变可能性被决定,然后与滑动窗户变光滑,并且最后过去常在正常和反常行为之间区别。来自Purdue大学和AT&T香农实验室的数据集上的二实验评估证明建议方法能完成更高的察觉精确性并且比另外的传统的方法要求更少的存储器。

  • 标签: 用户行为 可变长度 异常检测 度序列 状态 转移概率矩阵
  • 简介:以便完成聪明的车辆的侧面的控制,基于云模型使用双性人认知的模型并且遮蔽推理,解决决定问题聪明的车辆的侧面的控制质、量。由驾驶车辆获得很多个实验数据,根据数据的概念分类数据并且修理云控制器的输入和输出变量,设计聪明的车辆的云控制器的控制规则,并且遮蔽并且修理云控制器的参数:期望,熵和亢奋的熵。以便验证云控制器的有效性,联合模拟站台基于Matlab/Simulink/CarSim被建立。试验性的分析显示出那:司机侧面的控制器基于云模型能完成需要的角度追踪,并且完成好控制效果,它也验证那一系列心理活动象感到那样,认知,计算,决定等等模糊、不明确。

  • 标签: 自主车辆 MATLAB/SIMULINK 侧向控制 行为 驱动 学习
  • 简介:Forthetransientbehaviorofasemiconductordevice,themodifiedmethodofcharacteristicswithalternating-directionfiniteelementproceduresfornonrectangularregionisputforward.Sometechniques,suchascalculusofvariations,isoparametrictransformation,patchapproximation,operator-splitting,characteristicmethod,symmetricalreflection,energymethod,negativenormestimateandapriorestimatesandtechniques,areemployed.Inthenonrectangularregioncase,optimalorderestimatesinL^2normarederivedfortheerrorintheapproximationsolution.Thusthewell-knowntheoreticalproblemhasbeenthoroughlyandcompletelysolved.

  • 标签: 非矩形域 半导体装置 可变方向 特征有限元 L^2估计