学科分类
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500 个结果
  • 简介:Bytakinginfiniteperiodicbeamsasexamples,themutualvariationalprincipleforanalyzingthefreewavepropagationinperiodicstructuresisestablishedanddemonstratedthroughtheuseofthepropaga-tionconstantinthepresentpaper,andthecorrespondinghierarchicalfiniteelementformulationisthende-rived.Thus,itprovidesthenumericalanalysisofthatproblemwithafirmtheoreticalbasisofvariationalprin-ciples,withwhichonemayconvenientlyillustratethemathematicalandphysicalmechanismsofthewaveprop-agationinperiodicstructuresandtherelationshipwiththenaturalvibration.Thesolutionisdiscussedandex-amplesaregiven.

  • 标签: free wave propagation PERIODIC structures NON-SELF-ADJOINT
  • 简介:Theadsorptionoffreeacidoflowconcentrationbycrosslinkedchitosanresinwasfollowedbyelectrochemicalexperimentaltechnique.Theeffectofacidconcentrationandthemediaonadsorptionwasdiscussed.Theexperimentalresultsshowthatboththeapparentrateconstantandtheinteractionenergybetweentheadsorbentandadsorbatearedecreasedwhiletheconcentrationofhydrochloricacidisincreased.Intheadsorptionsystem.theadsorptionwaseffectedbyaddiitonoforganicsolvent.

  • 标签: 聚氨基葡糖树脂 吸附 实验
  • 简介:垂直地在免费表面上侵犯的一口2D槽喷气的流动特征被大埃迪模拟(LES)数字地与一个动态Sub-GridScale(SGS)模型一起调查。σ-坐标转变被介绍印射深度变量物理领域到一件深度制服计算领域。裂口操作员计划,把答案过程切成移流,散开和压力繁殖步,被采用解决即时速度和压力地。一个充分非线性的Lagrange-Euler方法被用来计算免费表面举起。数字结果证明喷气在Eestablished流动(ZEF)的地区保留你方类似,当喷气的骚乱逐渐地变从时对各向同性在表面冲击(ZSI)的地区各向异性。当喷气接近免费表面时,中心线速度很快减少并且流动被免费表面偏斜。二口对称的表面喷气在水平喷气(ZHJ)的地区被形成。超高的AnapproximateGuassian分发也在免费表面上被形成。Thecomputed结果在对可得到的试验性的数据的好同意。

  • 标签: 垂直射流 自由表面 数字研究 LES
  • 简介:Ageneralstochasticmodeloftheatmosphericpressureattheoceansurfacewasproposed,inwhichthepressurevariationwasrepresentedbyaspectraldecompositionthrougharandomprocessoforthogonalincrements.Fromthebasicequationsofidealandincompressiblefluidasetofperturbationequationsuptosecondorderhadbeenderivedandsolved.Thepressurevariationintheflowfieldhadbeencalculatedusingtheexplicitsolutionsobtained,andwhichdemonstratedaclearrelationbetweentheatmosphericpressureandtheoneatthebottomofdeepocean.Itcanbeseenthatthereisapartofthepressurevariationwhichisnotattenuatingwiththedepth.TheresulthadbeencomparedwiththoseofLonguet-HigginsandKadotaetal.andallpreviousresultsarecontainedinthesolutiongiveninthisartice.Therestrictiononthepreviousworkswithregardtotheprobabilitylawhasbeenremoved,andallconclusionsarededucedwithoutspecificassumptions.Theflexibilityoftheproposedmodelallowsforfurthergeneralizationandextensioninthephysicalaspectsandstatisticaltreatment.

  • 标签: 水动力学 水力学 动力学特征 研究
  • 简介:Theformationoffreeradicals(?)OHand(?)Hinanaturallyair-saturatedaqueoussolutionexposedtotherapeuticCWultrasoundatafrequencyof820kHzhasbeenconfirmedbyusingspintrapping5,5-dimethyl-1-pyrroline-1-oxide(DMPO)andelectronspinresonance(ESR)technique.Itissuggestedthattheseradicalsareformedduetothehightemperatureandpressureproducedbytheultrasonictransientcavitation.Thetransientcavitationthresholdisfoundat0.537-0.632W/cm2underasonicationtimeof3minutes.Withincreasingsoundintensitytheyieldoffreeradicals(?)OHraisesrapidlyattheintensityrangingfrom1—2W/cm2,andnolongerincreaseisobservedatabove3W/cm2.Thesoundintensity(I)dependenceoftheyieldof(?)OH(D)canbeapproximatelydescribedbyaregressionequation:D=8.1(I1/2-(Ic)1/2)1/2,whereIc=0.667W/cm2.UnderafixingsoundintensitytheyieldofOHincreasesmonotonouslywiththesonicationtime.

  • 标签: saturated CAVITATION minutes TRAPPING EXPOSED deviation
  • 简介:make the translation accord with the expressive way of target language. So make the translation acceptable. A translation which translated literally is close to the original. But literal translation is not omnipotent. Some sentences should not translate literally,it is a skill of translation. All in all. literal translation is not word-for-word translation. Literal translation is acceptable and nimble. 2.3 Some sentences should not translate literally. Some source language sentences are very difficult to translate literally. It only though of the meaning of surface,Any source language which does not accord with the expressive way of target language should not use literal translation. For example

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  • 简介:在这篇论文,明智的NCP功能为非线性的不平等被建议的有片的一个QP免费的可行方法抑制了优化问题。新NCP功能arepiece明智的线性合理的、常规伪smooth并且有好性质。这个方法是KKToptimality条件的方程重新阐述的线性系统的基于的在解决方案,由使用thepiecewiseNCP函数。这个方法是没有假定严格的补充条件能、全球性会聚的工具,累积的孤立的海角指。而且,活跃限制的坡度没被请求线性地独立。可以被伪获得的次矩阵--牛顿方法,没被请求一致地积极明确。初步的数字结果显示这个新QP免费的方法是相当有希望的。

  • 标签: 拘泥最优化 半光滑性 非线性互补 收敛
  • 简介:Preliminarydesignandsimulationofafreepistonenginesuitableforsmall-scaleenergyproductionindistributedenergysystemsispresentedinthispaper.Theproperties,particularlythepropertiesofgassealsoftheenginearesimulatedusingasimulationprogramdevelopedforthiscase,andtheresultsareutilizedinpreliminarymaindesignparameterselection.TheenginesimulationprogramwasdevelopedbycombiningandmodifyingthesourcecodesofthesimulationandcalculationprogramsobtainedfromHelsinkiUniversityofTechnology,TampereUniversityofTechnology,andLappeenrantaUniversityofTechnology.Becauseofthecontact-freelabyrinthsealusedinthepiston,theefficiencyofthemotorislowerthantheefficiencyofaconventionalmotorwithoillubricatedpistonrings.Ontheotherhand,thelackofbearinglosses,andthelackoflossesassociatedwithacrankshaftsystemandagearbox,aswellasthelackoflubricationoilexpenses,compensatesthiseffect.Asanetresult,thisnewmotorwouldperformslightlybetterthantheconventionalone.Beingcompletelyoil-free,itisveryenvironmentallyfriendly,anditsexhaustgasesarecompletelyfreeofoilresidualswhicharecausingproblemsinnormalgasmotors.

  • 标签: 自由活塞发动机 迷宫密封 流体动力学模型 分布式能源系统 模拟仿真 密封性能
  • 简介:Chinawillfaceareboundofgeneticallytransmitteddiseasesinnewbornsinthreetofiveyearsifthetrendofrapidlydecliningpre-maritalphysicalexaminationsisnotreversed,accordingtoGuXiulian,ViceChairmanoftheStandingCommitteeoftheNationalPeople'sCongress.

  • 标签: 中国 婚检 疾病预防 婚姻制度
  • 简介:因为免费表面旋涡吸收的空气在抽的系统上导致噪音,颤动,和成穴腐蚀,免费表面旋涡控制在一个泵池系统是重要的。在这研究,在泵吸入的免费表面旋涡和空气吸收的变化被部分(VOF)方法的体积与稳定的多相的流动模型一起调查了以便确切代表免费表面旋涡的行为。同类的免费表面模型被用来使用空气和水的相互作用。结果证明由免费表面旋涡运动的空气吸入能用空气体积部分的iso表面被设想。旋涡用免费表面做空气列到泵吸入。另外,免费表面旋涡能被安装窗帘墙控制,这被发现。

  • 标签: 自由表面 旋涡控制 数值模拟 诱导 进气道 泵送系统
  • 简介:LFCisafunctionallanguagebasedonrecursivefunctionsdefinedincontext-freelanguages.Inthispaper,anewpatternmatchingalgorithmforLFCispresented,whichcanrepresentasequenceofpatternsasanintegerbyanencodingmethod.Itisarathersimplemethodandproducesefficientcase-expressionsforpatternmatchingdefinitionsofLFC.Thealgorithmcanalsobeusedforotherfunctionallanguages,butfornestedpatternsitmaybecomecomplicatedandfurtherstudiesareneeded.

  • 标签: 泛函语言 LFC 递归函数
  • 简介:后退,两脚叉开,慢慢助跑,最后一步突然发力将球踢出,收回右腿,身体还没回位,皮球却已飞入了对方大门——这就是克里斯蒂亚诺·罗纳尔多的任意球绝技。截至2月26日,C罗本赛季已利用任意球四度攻破对方球门,事实上,在效力曼联期间,他有16个进球来自任意球。从数据上来看,葡萄牙人已经是不折不扣的任意球大师了。

  • 标签: 任意球 葡萄牙人 进球 定位球 主罚 射门
  • 简介:“亲爱的小伙伴们:(2014年)12月23日,360免费电话正式和大家见面,‘免费电话’4个字就像一颗石头,惊起波澜……一切只为了让通话变得更自由,让免费真正说到、听到……如果说每款产品都有一个情怀,那我们的情怀就是免费。”岁末年初,360免费电话悄然上市,并迅速以“好友间无限时畅聊”、“移动流量消耗最低”的噱头吸引了一大批用户。可惜好景不长,还没“免费畅聊”多久,360就“决定暂时将免费电话功能下线”。

  • 标签: Free 免费电话 电话功能 限时 移动
  • 简介:Theabsorptionoffreealkaliatlowconcentrationbysubacidresinwastracedwithelectricconductancemethod,theeffectoftemperatureontheadsorption,theactivationenergy,ofadsorption(Ea)andinteractionenergy(U)wasstudied.Theresultshowedthat,theprocessoflowconcentrationalkaliadsorptionbysubacidresinwasinaccordancewithmechanismofmonomolecularlayerabsorption,inaddition)withtheincreasingoftemperature,theinteractionenergybetweenadsorbateandsorbentincrease,sodidthesurfaceadsorptionrate(k),andlinearcorrelationexistedbetweeninteractionenergy(U)andtemperature(T).

  • 标签: 食品处理 微酸树脂 吸附
  • 简介:有高顺序的边界条件为秒顺序产生的液体结构相互作用的域里的问题的一个大类部分微分方程。各种各样的方法正在被使用处理与Laplaces方程联系的这些种混合边界值问题(或Helmholtz方程)在通过固体或液体宣传的波浪的学习产生。在波浪结构相互作用的广泛地使用的方法之一是多极扩大方法。这扩大包含一个常规波浪,波浪来源,波浪偶极子和常规没有波浪的部分的一般联合。没有波浪的部分能进一步以作为没有波浪的潜力被称为的没有波浪的多极被扩展。这些是Laplaces方程或二维的Helmholz方程的单个答案。这些没有波浪的潜力和多极的建设为象二维的非倾斜、倾斜的波浪那样的很多种状况以一种系统的方式这里被介绍,在有有部分衍生物被考虑的更高的顺序的免费表面状况的二层的液体的三个维的波浪。特别地,这些被获得面对作为一个薄有弹性的盘子建模的一个冰封面在免费表面并且也表面紧张的存在的效果考虑。另外为限制大小写,多极和没有波浪的潜在的功能走向单个层多极和没有波浪的潜力,这能被显示出。

  • 标签: 流体-结构相互作用 多极展开法 高阶偏导数 自由表面 边界条件 二层流体