简介：U-shapedmicro-nanochannelscangeneratesignificantflowdisturbanceaswellaslocallyamplifiedelectricfield,whichgivesitselfpotentialtobemicrofluidicmixers,electrokineticpumps,andevencelllysisprocess.NumericalsimulationisutilizedinthisworktostudythehiddencharacteristicsoftheU-shapedmicro-nanochannelsystem,andtheeffectsofkeycontrollingparameters(theexternalvoltageandpressure)onthedeviceoutputmetrics(current,maximumvaluesofelectricfield,shearstressandflowvelocity)wereevaluated.Alargeportionofcurrentflowingthroughthewholesystemgoesthroughthenanochannels,ratherthanthemiddlepartofthemicrochannel,withitsvalueincreasinglinearlywiththeincreaseofvoltage.Duetothelocaliondepletionnearmicro-nanofluidicjunction,significantlyenhancedelectricfield(asmuchas15foldatV=1VandP0=0)aswellasstrongshearstress(leadingtoelectrokineticflow)isgenerated.Withincreasingexternalpressure,bothelectricfieldandshearstresscanbeincreasedinitially(duetoshorteningofdepletionregionlength),butaresuppressedeventuallyathigherpressureduetothedestructionofiondepletionlayer.Insightsgainedfromthisstudycouldbeusefulfordesigningnonlinearelectrokineticpumpsandothersystems.

简介：AnovelopticalfibersensorwithaU-shapedmicro-groovestructureablatedbyfemtosecondlaseronsingle-modefi-berformeasuringairrelativehumidity（RH）isreportedinthispaper.Inordertoimprovetheaccuracyofsensor,agrapheneoxide（GO）/polyvinylalcohol（PVA）compositefilmiscoatedonthesurfaceofmicro-groovestructure.IntheU-shapedmicro-groovestructure,theremainingcoreandmicro-cavityinthemicro-groovemakeuptwomajorop-ticalpropagationpaths,formingaMach-Zehnderinterferometer（MZI）.ThesensorhasagoodlinearresponsewithintheRHrangeof30%--85%,andthemaximumsensitivitycanreach0.6381mrd%RH.Theeffectoftemperatureontheoverallperformanceofthehumiditysensorisalsoinvestigated.Asanewtypeofall-fiberdevice,thesensorshowsexcellentsensitivityandstability.

简介：象多重信号分类和经由旋转不变性技术(精神)的信号参数的评价那样的高分辨率的途径当前在multibeam回响声音(MBES)广泛地被采用为海地板深测术的系统，在一个一致的线数组也被要求的地方。然而，由于要求以系统范围/决定和安装空间限制，一个MBES系统通常与特殊形状采用一个收到的数组，它意味着高分辨率的算法不能直接被使用。另外，当在MBES系统使用高分辨率的算法时，短期的静止回响信号使估计高分辨率的途径要求的协变性矩阵困难，它进一步增加复杂性。有多重角度的subarraybeamforming的精神被采用以signal-to-noise比率，快照的数字，和计算努力减少要求。模拟证明新处理方法能提供更好好结构的分辨率。然后，一个highresolution底部察觉(HRBD)算法被把新处理方法与虚拟数组转变相结合开发。到一个U字形的数组的HRBD算法的应用程序是也讨论。计算机模拟和试验性的数据处理结果验证建议算法的有效性。

简介：ThisisoneoftheapplicationsofPart(Ⅰ),inwhichtheangularstiffness,andthecorrespondingstressdistributionsofU-shapedbellowswerediscussed.Thebellowswasdividedintoprotrudingsections,concavesectionsandringplatesforthecalculationthatthegeneralsolution(Ⅰ)withitsreducedformtoringplateswereusedrespectively,butthecontinuityofthesurfacestressesandthemeridianrotationsateachjointofthesectionswereentirelysatisfied.Thepresentresultswerecomparedwiththoseoftheslenderringshellsolutionproposedearlierbytheauthors,thestandardsoftheExpansionJointManufacturersAssociation(EJMA),theexperimentandthefiniteelementmethod.Itisshownthatthegoverningequationandthegeneralsolution(Ⅰ)areveryeffective.

简介：Thispaperfollowstheworkof[1,2].Therearesomeprogressindealingwithmoderatelysmallrotations(thesquaresofrotationanglesaretheorderofmagnitudeofstrains)ofmiddlesurfacenormalsofinsideandoutsideringshellsandcompressedangleofbellows.Calculationresultsagreewithexperimentswell.Tobellowdesign,themethodgiveninthispaperisofpracticalvalueandthediscussionoftheinfluenceofcompressedangleoncharacteristicrelationishelpful.

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简介：在用黄金和银做的塑造的nanoparticles的合成的进展在这篇文章被考察。这评论由分析在nanoparticle形状和它的内部水晶的结构的几何对称之间的关系以一个新角度开始。根据关系，有明确的形状的nanoparticles被分类进三个范畴：有单个crystallinity，有尖双胞胎的nanoparticles，和有平行双胞胎的nanoparticles的nanoparticles。为在每个范畴的塑造的nanoparticles的合成的古典方法的讨论和分析也被包括，在塑造的金属nanoparticles的合成的未来研究方向上的个人观点简短被总结。这评论被期望在为塑造的nanoparticles的合成设计策略并且分析相应生长机制提供一个指南。

简介：不知何时开始，USB成为一种可怕的基因蔓延开来：众多的小玩意儿身上都长出了明显的或是隐藏的统一的、扁平的接口。不过，当迷恋上这些“转基因”小玩意儿之后，你最大的遗憾就是怨恨自己身上怎么没有USB接口！

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简介：摘要：随着社会不断的进步与发展，城市的幼儿教育是得到了非常明显的提高，而其中对于农村的教育，教育部也进行了大量的改革，积极的倡导家园共育这一理念，培养幼儿良好的学习品质是有非常大的帮助，因此本文对于城市中的幼儿教育与农村中的幼儿教育进行比较以及农村家园共育培养幼儿良好学习品质模式进行分析与讨论，从而为关注这一话题的人们提供参考。

简介：Thispaperpresentsanewmethodforsolvingthevibrationofarbitrarilyshapedmembraneswithelasticalsupportsatpoints.Thereactionforcesofdlasticalsupportsatpointsareregardedalunkmownexternalforcesactingonthemembranesthemembranes.Theexaclsolutionoftheequationofmitionisgivenwhichincludestermsrepresentingtheunknownreactionforces.Thefrequencyequationisderivedbytheuseofthelinearrelationshipofthedisplcementswiththereactionforcesofelasticalsupportsatpoints.Finallythecalculatiogformulaeofthefrequencyequationfocircularmembranesareanalyticallyperformedasexamplesandtheinheremfrequenciesofcircularmembraneswithsymmetricelasticalsupportsattwopointsarenumericallycalculated.

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简介：Thisletterreviewstheadhesiveandfrictionalpropertiesofthefirstmushroom-shapedadhesivemicrostructure(MSAMS),whichhascomealongwayfrominspirationbytheattachmentdevicesevolvedinbeetlestoalarge-scaleindustrialproduction.Itwasshowntohaveanthatabouttwicehigherpull-offforcecomparedtoasmoothcontrolmadefromthesamematerialmeasuredonsmoothsubstrates.Pull-offforcesmeasuredunderwaterareevenhigherthanthoseinair.Moreover,itretainedadhesiveperformanceoverthousandsofattachmentcyclesandinitialadhesivecapabilitycouldberecoveredbywashingafterbeingcontaminated.Inshearing,MSAMSexhibitsreducedandstabilizedfrictionincomparisonwithasmoothcontrol,whichdemonstratedpronouncedstick-slipmotion,andshowszeropull-offforceinashearedstate,allowingtheadhesiontobeswitchedonandoff.Thepresenceofafluidinthecontactzoneshowedadhesionenhancementonbothsmoothandroughsubstrates.AllthesefeaturesleadustoconcludethatMSAMSmayhavepracticalpotentialinavarietyofapplications.

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简介：为了开发一个双人脚踏车弹头，那能有效地破坏具体目标，这篇论文借助于实验与不同的锥角度和班机材料探索塑造的费用的穿入表演进具体目标。穿入过程和由塑造的费用和动能射弹的具体目标的破坏机制被分析并且比较。试验性的结果建议运动精力充沛的射弹和塑造的充电能够破坏损坏的具体目标，而是大小是不同的。与动能射弹相比，塑造的费用有穿入的更多的重要效果进目标，并且引起很大的spalling区域。因此，塑造的费用对双人脚踏车弹头的第一阶段的充电相当合适。当洞直径变得更大时，随塑造的费用班机锥角度的增加，穿入的深度逐渐地减少，这也被发现。有铜班机的穿入深度比铝班机大，但是洞直径相对更小，并且有钢班机的塑造的起诉在上述二诉讼之间。有100°的一个锥角度的塑造的费用能形成喷气射弹费用(JPC)。与JPC，有具体目标上的最佳深度和直径的一个洞能被形成，它保证秒阶段弹头顺利渗透进洞并且在最佳深度爆炸在具体目标完成破坏的需要的水平。

简介：Filmcoolingisintroductionofasecondaryfluid(coolantorinjectedfluid)atoneormorediscretelocationsalongasurfaceexposedtoahightemperatureenvironmenttoprotectthatsurfacenotonlyintheimmediateregionofinjectionbutalsodownstreamregion.Thispapernumericallyinvestigatedthefilmcoolingeffectivenessontwotypesofholegeometrieswhicharecut-shapedholeandantivortexhole.The3Dcomputationalgeometriesaremodeledwithasingle30degangledholeonaflatsurface.Thedifferentblowingratiosof0.5,1,1.5,2,2.5,3,3.5,4,4.5,5andk-Epsilonturbulencemodelareusedinthisstudy.Atwodimensionaldistributionoffilmcoolingeffectivenessinthedownstreamregionofthecoolingholeisperformed.AcomparisonofspanwiseaveragedeffectivenessisalsoperformedinthefieldstartsfromcenterpointofholetoX/D=30.

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简介：在旅行波浪转变下面，一些非线性的部分微分方程例如Camassa河边肥沃的低地方程，高顺序的KdV方程，等等，被归结为u″表示的一首integrable颂诗+p(u)(u')2+q(u)=0答案能被给其将军。而且，为多项式联合完全的辨别系统，这些方程的所有单个旅行波浪答案的分类被获得。方程u″0包括的+p(u)(u')2+q(u)=是的方程(u')2=f(u)一种特殊情况，建议方法能也因此被用于很多非线性的方程。这些完全的结果不能被任何间接方法获得。

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