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78 个结果
  • 简介:the way a military general organises his army would affect the behaviour of the troops in battle. In the same way,the general must change his strategy accordingly. In other words,an existing organisation or structure should not be viewed as constraints to change if the strategy dictates that the change is necessary. In this aspect

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  • 简介:the way a military general organises his army would affect the behaviour of the troops in battle. In the same way,the general must change his strategy accordingly. In other words,an existing organisation or structure should not be viewed as constraints to change if the strategy dictates that the change is necessary. In this aspect

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  • 简介:Wettingandspreadingprocesseswhichinvolvesurfactantsolutionsarewidelyusedinnumerousindustrialandpracticalapplicationsnowadays.Theperformanceofdifferentnon-ionicsurfactantsmayvarysignificantlyandsofarsuperspreadersolutionsshowthemostpromisingspreadingability.Theadditionoftrisiloxanesurfactantstowaterwasproventoenhancewetting,evenonhydrophobicsurfaces,onwhichconventionalsurfactantsseemtohavelittleornoeffect.Althoughtheseextraordinarysurfactantshavebeenextensivelystudiedoverrecentyears,completeunderstandingoftheirunderlyingmechanismsandasuitablemathematicalmodelarestilllacking.Herewepresentapossibleexplanationfortheimpressiveperformanceoftrisiloxane,whichiscomparedtowettingenhancementofaconventionalsurfactant.Additionally,wewillexplainwhythehydrophobicityofthesurfaceisacrucialfactorforthespreadingphenomenon.LightwillbealsoshedontheeffectofthepHofthesolutiontowhichsurfactantsareadded.Finally,wewillinvestigatelong-termeffectsofthewaterenvironmentontrisiloxanewettingabilityanddiscussifageingmaysignificantlyaffecttheirperformance.

  • 标签: HYDROPHOBICITY superspreading SURFACTANTS WETTING
  • 简介:Thevolumesperoxygenofsomesilicatemeltshavebeencalculatedandthencomparedwiththoseofsilicateglasses.Itissuggestedthatthevolumeofasilicatemeltcanbedividedintotwoparts.Oneiscontributedbythesilicon-oxygennetworkandtheotherbythe“oxides”.VariationpatternsofVPOssuggestthatthevolumeoftheSi-Onetworkgenerallyremainsunchangedandtheexpansionofthemeltiscausedmainlybythelocatexpansionofthe“oxides”.ItisfurtherproposedthattheradiusofO^2-showslittlevariation,instrikingcontrasttotheradiusofcations.Themechanismgoverningtheexpansionisdiscussedindetail.

  • 标签: 熔融硅酸盐 金属化合物 二氧化硅 玻璃 氧化物 硅-氧键
  • 简介:我们试验性地学习微观结构和自然奶牛皮革的机械行为。张力的测试用皮革脱衣被执行观察他们的变丑,爬并且失败。奶牛皮革的微观结构是从一些的不同尺寸的纤维的一个分层的、复杂网络到在直径的一些几百纳米,这被发现。他们显示出非线性的压力紧张关系和粘弹性的行为。湿度的效果也被检验。一根multilayered横梁的一个简单理论模型被建议描述最在紧张的基本行为。

  • 标签: 力学性能 天然 牛头 应力应变关系 显微组织 粘弹行为
  • 简介:这份报纸在小粒的固体的体积回答上检验严肃的影响。在这研究的装载情形包括限制压缩,杆穿入进小粒的媒介并且通过一个孔排出。类似的装载和流动条件是可能的在表土在在situ资源利用过程包括的地球外的探索活动受到的压力和变丑政体被遇到。球形、非球形的粒子用分离元素方法(DEM)被学习。虽然DEM逐渐地被用来为小粒的固体建模,模拟结果的小心的确认是相当稀罕的。因此除了探索严肃的效果,这份报纸也在陆上的状况下面把DEM模拟与实验作比较验证DEM是否能生产令人满意的预言。陆上的实验与大照顾被进行并且用DEM仔细模仿了。为粒子的关键机械、几何的性质在DEM模拟为使用在实验室测试被测量。一系列DEM计算然后在减少的严肃下面被执行在地球外的环境下面模仿这些实验。严肃没在限制压缩盒子中在力量传播上有显著效果,这被发现;在杆穿入的装载坡度与严肃线性地成正比;在地窖分泌物的集体流动率是比例的与减少严肃摆平严肃和休息增加的角度的根。这些调查结果与期望一致并且存在科学证据。

  • 标签: 地质勘探 动力效应模型 方法 研究
  • 简介:Experimentsshowthatsiltsandsiltysoilsexhibitcontractionfollowedbydilationduringshearingandtheslopeoffailurelinedecreasesatlargestrains,termedasphasetransformationbehaviour.Thispaperistodevelopanewmicromechanicalstress-strainmodelthataccountsforthephasetransformationbehaviourbyexplicitlyemployingthephasetransformationlineanditsrelatedfrictionangles.Theoverallstrainincludesplasticslidingandplasticcompressionamonggrains.Theinternal-frictionangleatthephasetransformationstateandthevoidstatevariableareemployedtodescribethephasetransformationbehaviour.ThemodelisexaminedbysimulatingundrainedanddrainedtriaxialcompressiontestsperformedonPiteasilts.Thelocalstress-strainbehaviourforcontactplanesisalsoinvestigated.更多还原

  • 标签: 相变行为 力学建模 三轴压缩试验 细观 应力应变特性 内摩擦角
  • 简介:我们在场散开的一个计算机模型与线arseed限制了聚集。有改变线性种子长度的簇被模仿,并且他们的模式结构,分数维的尺寸和多分数维的光谱被获得。如果它的长度比较地更短,模拟结果证明线性种子长度在聚集簇的模式结构上有小效果。与它的增加,线性种子长度有更强壮的效果在模式结构,当尺寸D-f减少时。当线性种子长度更大时,相应模式结构同样地是生气的。线性种子长度越大,越多明显有在二点聚类的更多的粒子的跨like结构线性种子并且沿着垂直方向结束到线性种子的中心。而且,multifractralspectra曲线变得更低并且奇特的范围更狭窄。线arseed的长度越长,模式变得越不不规则、不一致。

  • 标签: 标度 扩散有限聚集 聚簇 模式结构
  • 简介:—Effectivestressanalysisisperformedtoevaluatetheresidualdisplacementofacaissonquaywallduring1994Hokkaido-Toho-OkiEarthquakeand1993Kushiro-OkiEarthquake.Theconstitutivemodelusedinthisstudyisamultipleshearmechanismtypedefinedinstrainspaceandcantakeintoaccounttheeffectofrotationofprincipalstressaxis.Theearthquakeaccelerationsrecordedattheoutcroppingrockduringtheearthquakeareusedasinputbedrockmotion.Theresultsoffiniteele-mentanalysisareingoodagreementwiththeobservedbehaviourofthequaywall.Theanalysisalsoindi-catesthatliquefactionandhighexcessporewaterpressurehaveasignificanteffectonthedeformationofthecaisson.Soilimprovementisspeculatedasthemostreliablemeasuresagainstliquefaction.Theinflu-enceofsoilimprovementandthereasonableimprovedareaarediscussedinthepaper.

  • 标签: CAISSON quaywall EFFECTIVE stress analysis LIQUEFACTION
  • 简介:ThispaperdiscussesthenonlinearstabilitybehaviourofdistortedplaneCouetteflowto2-dimensionaldisturbances,andcomparesitwiththatofdistortedplanePoiseuilleflow.TheresultsshowthatplaneCouetteflowismoreunstablethanplanePoiseuilleflowtofinite-amplitudedisturbances.

  • 标签: distorted PLANE COUETTE FLOW distorted PLANE
  • 简介:张力爬精细的Fe-Mn二进制合金containing0.42-1.21wt.%Mn的行为从房间温度在温度范围被调查了到475Kunder10-50MPa。张力的测试以紧张率在uniaxail负担下面以经常的小标题速度被执行10(-4)s(-1)。压力代表和激活精力决心澄清变丑机制。稳定的状态的获得的变化爬关于为Fe-Mn二进制合金的应用压力的率在大约20MPa展出二不同政体,显示一个可能的变化在爬机制。平均压力代表是约2.2,它是在合金滑动的谷物boundry的一个特征。为塑料流动的激活精力从135~92kJ/mol变化,取决于Mn内容。

  • 标签: 蠕变 Fe-Mn二元合金 温度范围 张力测试
  • 简介:GeochemicalBehaviourofRareEarthElementsintheErdaogouGoldDepositPangJiangli(庞奖励)(DepartmentofGeography,ShanxiNormalUniversity,...

  • 标签: RARE earths GEOCHEMISTRY Erdaogou gold DEPOSIT
  • 简介:由刺的阀值的频率依赖上的数字模拟,即为到火的一个神经原,在周期的刺激的批评振幅上,我们发现那浓密在耳蜗的原子展览频率选择行为的房间。然而,选择频率乐队一浓密房间是远的离开的比较喜欢光谱在人和哺乳动物的范围听觉的感觉。位于这项神经活动下面的机制也被讨论。离子隧道密度举办的Furtherstudies表演选择频率乐队上的很少影响浓密房间。这些调查结果建议频率选择在的neuronal行为浓密在单个房间和人口层次的房间可能不与频率辨别机能上地相关。我们的结果可以揭示一个神经提示到再考虑在上浓密房间在声音的听觉的信息处理的功能的角色频率“。

  • 标签: 听觉系统 中脑 耳蜗核 频率选择行为 数值模拟
  • 简介:Renewableenergyisclearlyaveryimportanttopicnowadays.Theriskandthedamagethatcouldbecausedbyconventionalenergyresourcescannotbehidden.Thereisanenormousneedthatpeoplestartformulatingabetterattitudetowardsrenewableenergyandchangetheirconsumptionbehaviour.Otherwise,thefutureofenvironmentandthecominggenerationsaredefiantlynotgoingtobepromising.Thispaperdiscussestheimportanceofsustainableenergyandhowtheenergyrelatedbehaviouriscreated.Itpresentsaframeworktoinfluencethecurrentbehaviourandpushittobemoregreenoriented.Itisalsoimportanttoknowtillwhatlimitaregovernmentsresponsibleinthischange,andwhatarethetoolsthattheyhavetopushtowardsgreendirection.

  • 标签: 可再生能源 消费行为 政府 责任 可持续能源 能源资源