简介:Thedistributionofelectricfieldforthealignmentandattachmentofcarbonnanotubes(CNTs)wassimulated.Tobeattachedatthedesiredplace,thealignedandattractedCNTsshouldbestayedinthedesiredareacalledthestableregionorthequasi-stableregionforaninstantwherethechangeofelectricfieldisminimized.Sincetheconicalelectrodehastheverynarrowsizedquasi-stableregion,fewCNTscanbeattached.Therectangularelectrodeshaveawidestableregion,solotsofCNTscanbeattached.Theresultsindicatethattheroundelectrodewhichhasapropersizedquasi-stableregionismoreeffectiveforaligningandattachingasingleCNTthantheconicalorrectangularshapedelectrodes.
简介:MoleculardynamicssimulationwascarriedouttoinvestigatetheliquidandamorphousmicrostructuresofbinaryAgx-Rh(100-x)(x=25,50,75inatomfraction)alloys.SegregationfeatureofhomogeneousinteratomicbindingofAg-Rhliquidwasfoundandprobed,whichcanberetainedintoamorphoussolidsuponrapidcooling.Homogeneousbindingmayoccurwhenthedifferenceintheelementalatomicsizesislessthan10%.Theicosahedrainliquidbeforetheformationofamorphousstateexistinastablestateandthenetworkformedby1551-clustersinmoltenalloyswouldinhibitthecrystallizationanddiffusionofatoms.Ahigherdegreeof1551-clusterswillbefavorabletoformmetallicglasses.
简介:为描述铁粉末的压缩过程的一个新模型基于连续统假设和椭圆的收益标准被建议。模仿densification行为,组成的模型在马克被实现计算机节目。为在负担和排水量之间的关系,不同模型被比较,在组成的方程的参数的影响借助于模拟和实验是坚定的。balancer的密度分发被测量并且模仿。参数采用了的结果表演为负担排水量曲线起一个修正作用,并且与另外的模型相比,现在的模型主要由于不同参数A和B在压缩进程的以后的阶段与试验性的数据更好适合。接触表面上的磨擦在细工品的大变丑下面贡献不同类的密度分发。在模拟和试验性的数据之间的比较显示这个模型能被用来精确并且有效地预言粉末协议过程。
简介:BasedonthetechniqueforpreparingLaCl3viadirectpyrolysisofrareearthchloridesolution,ajetpyrolysisreactorwasdesignedandtheintra-reactortemperatureandchemicalreactionswerenumericallysimulatedusingcomputationalfluiddynamics(CFD)technique.Theresultsshowthattheflowratevariationatthefuelinletdoesnotlargelyaffectthetemperatureinthereactor,whiletheincreaseinexternalpressureatthematerialinletrapidlydecreasestheaveragetemperature,Venturitemperature,andoutlettemperature.TheCH4andO2insidethereactorarecombustedcompletely,andwhenthematerialinletpressureis\90Pa,theLaCl3isfullypyrogenated.ThecontentsofCO2,La2O3,andHClfluctuateneartheVenturitubeandfinallystabilize.La2O3contentattheoutletisinatop-to-bottomgradient.
简介:变丑行为,温度进化和联合效果在形成形成的部件的过程和质量上有重要影响,它处于良好的竟技状态在由于装载路径和处理参数联系的复合的复杂性装载的多方法下面的铝合金7075生气阀门的过程是很复杂的。这个过程的一个模型基于联合thermo机械的有限元素方法在DFEORM-3D环境下面被开发。在模型,常规等温的过程模型和非等温的过程建模的二个过程之间的比较在这发展了学习,被执行,并且结果显示热事件起在形成在装载的多方法下面的过程的铝合金的一个重要作用。提起的温度域和紧张的分布和进化被非等温的过程模拟获得。处于良好的竟技状态生气阀门的过程的塑料地区和它的扩展被分析。结果可以为装载形成计划的多方法的决心提供指南,装载形成的十字调节阀门部件。
简介:Thenucleationoforderedphasewassimulatedbasedonmicroscopicdiffusionequationandtheassumptionsoftheclassicalnucleationtheorywereexamined.Thequantitativecalculationsofinterfacethicknessevolutionwereaccomplishedforthefirsttime.Itwasfoundthattheinterfacesbetweenorderedphaseanddisorderedmatrixwerediffuse.Theinterfacethicknessdecreasedwithtime,fromtheinitial1.2nmtoanequilibriumvalue0.6nm.Theratiosoftheradiusoforderedparticlesandtheinterfacethicknessmonotonouslyincreased,buttheywereofthesameorderofmagnitudeallthetime.Thesharpinterfaceassumptionshouldnotbeadoptedinthisstage.FortheAl-10%Li(atomfraction)alloyagedat192℃,theassumptionsoftheclassicalnucleationtheorydisagreedwiththefacts.Thephasetransformationfollowedthenon-classicalnucleationmechanismandtheapplicablescopeoftheclassicalnucleationshouldbeconfined.
简介:SiC/Si<潜水艇class=“a-plus-plus”>3N<潜水艇class=“a-plus-plus”>4合成是用自我繁殖的高温度的燃烧合成-Si3N<潜水艇class=“a-plus-plus”>4粉末和适当数量原文如此搽粉。两个都,sintering添加剂,系统被使用,它是YAN(Y2O3艾尔2O3AlN)并且YN(Y2O3AlN)。影响在SiC/Si的sintering行为上原文如此满意<潜水艇class=“a-plus-plus”>3N<潜水艇class=“a-plus-plus”>4合成被调查。结果证明有二个sintering添加剂系统的样品的密度,收缩,弯曲力量,坚硬,和破裂坚韧随内容的增加增加第一原文如此然后甚至当原文如此内容不断地增加时,减少。样品的重量损失的趋势是相反的。有最好的机械性质的样品原文如此满意在二个系统是不同的。为YAN系统,当原文如此内容到达10时,样品的最好的机械性质被获得?%,当至于YN系统它是5时?%。YN样品的性质比YAN样品优异。J阶段(2Y2O3吠敨爠畯整漠?灡汰楹杮氠睯瀠敲獳牵?景???慐漠?桴?獡搭獩牰灯牯楴湯瑡摥朠敲湥挠浯慰瑣搠牵湩?桴?敤潳灲楴湯爠'啼礃A慮楴湯瀠潲散獳椠?楳畴栠瑯搠晥牯慭楴湯椠??灳牡?汰獡慭猠湩整楲杮?偓?猠獹整?慣?扯慴湩挠浯汰瑥汥?敲潣扭湩摥丠??洠条敮?楷桴朠潯?湡獩瑯潲祰愠摮洠条敮楴?牰灯牥楴獥?桔?慭楸畭?慭湧瑥捩瀠潲数瑲敩??????汣獡?愢瀭畬?汰獵?慭?猯'T?????鮪徬鞪??极脿???醰鑛??鴿鎘銳????�
简介:ThesubmicronpowdermixturesofTiC-TiN-WC-Mo-C-Nisinteredat1400℃orbelowinvacuumwerestudiedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM)analyses.TheresultsshowedthatMo2Cformedat800℃orbelow.BothWCandMo2Cdisappearedat1200℃,andTiNdisappearedat1250℃.Inaddition,thevariationsoflatticeconstantsofthetitaniumcarbonitrideandnickelbinderphasewithsinteringtemperaturewereexperimentallyobtained,andthereasonwasanalyzed.
简介:Usingdensityfunctionalmethods,somepropertieswerestudiedsuchastheenergiesandcompositionsoffrontiermolecularorbitalsandtheatomiccharges,whicharerelatedtothereactivebehaviorofthioureascontainingdifferentN-substituentgroupings.ThecalculationresultsindicatethattheN-substituentgroupingshavesignificanteffectontheflotationperformanceofthioureacollectors.Theorderofelectron-donatingabilityisN-propyl-N'-benzyl-thiourea(PBZYTU)>N-propyl-N'-ethyl-thiourea(PETU)>N-propyl-N'-allyl-thiourea(PALTU)>>N-propyl-N'-acetyl-thiourea(PACTU)>N-propyl-N'-ethoxycarbonyl-thiourea(PECTU)>N-propyl-N'-benzoyl-thiourea(PBZOYTU),andtheorderoffeedback-electron-acceptingabilityisPBZOYTU>PACTU>PECTU>>PALTU>PETU>PBZYTU.ThisimpliesthatPBZOYTU,PACTUorPECTUcanreactwithcopperatomshaving(t2g)6(eg)3Cu(II)ort6e4Cu(I)configurationonthesurfacesofcoppersulfidemineralsthroughnormalcovalentbondandbackdonationcovalentbond,andexhibitexcellentlycollectingperformanceforcoppersulfideminerals.Theseareconsistentwiththeexperimentaldatareportedintheliteratures.
简介:基于FE,模拟被建议预言热短小裂缝和表面的出现的一个损坏预言方法在液体固体挤出过程裂开。这个方法综合批评温度标准和可锻的损坏模型,它被用来预言热短小裂缝和表面的开始分别地产品击碎的Cockcroft与Latham。有热转移以及可锻的损坏的变丑的Acoupling模拟被执行在Csf/AZ91Dcomposites的损坏行为上调查挤出温度和挤出速度的效果。半固体地区向变丑地区逐渐地移动,穿孔机下降,这被结束。在出口的温度上升的振幅从温度在给定的穿孔机排水量在不变的挤出期间随挤出速度的增加增加的起始的营舍死。以便在composites的早期的融化温度以外阻止产品的表面温度,批评挤出速度随挤出温度的增加被减少,不那样,热短小裂缝将发生。最大的损坏价值与增加挤出速度或挤出温度增加。理论结果由Deform获得了?-2D模拟与实验同意很好。