简介：1982年,伟大的迈克尔·乔丹和摩西·马龙分别在NCAA和NBA的战场上纵横驰骋、称王称霸;同样是在1982年,伟大的设计师BruceKilgore推出了第一双AirForce1篮球鞋,并进而在篮球鞋这个战场上独占鳌头。如今,25年过去了,在这长达1/4个世纪的时间里,AirForce1非但没有被岁月所淘汰,反而愈发显示出其映照世界的光芒。AirForce1是第一款运用了气垫技术的篮球鞋,大大提高了球鞋的舒适性能、缓冲性能和支撑性能,这对篮球鞋来说堪称一场革命。

简介：1.INTRODUCTIONAcidrainobservationsshowthatacidcloudwaterinShanghairegionappearsnotonly

简介：Theeffectofnozzlegeometryonsoniclineandcharacteristicsofsupersonicairjetwasstudied.Computationalfluiddynamicswasappliedinthisstudy.Theaxisymmetricnozzlegeometriesinvestigatedweretwodifferentcontourconvergingnozzles,twodifferentconicallyconvergingsharp-edgednozzlesandasharp-edgedorifice.Theresultsshowthatthesupersonicjetstructure,soniclineandstreamlinesinsupersonicjetarestronglyinfluencedbythenozzlegeometry,andthetotalpressurelossincreaseswiththeincreaseofMachdiskdiameter.Thepresentnumericalsimulationisaneffectivetooltoevaluatecompressibleflowsinsupersonicairjet.

简介：Whencondensationoccursinsupersonicflowfields,theflowisaffectedbythelatentheatreleased.Inthepresentstudy,Navier-Stokesequationsweresolvednumericallyusinga3rd-orderMUSCLtypeTVDinite-differenceschemewithasecond-orderfractional-stepfortimeintegration,Baldwin-Lomaxmodel,thatisthealgebraicmodel,calledthezeroequationmodelwasusedinthecomputations.Theeffectsofinitialconditions(initialdegreeofsupersaturationandtotaltemperatureinthereservoir)oncondensingflowofmoistairinasupersoniccircularhalfnozzlewereinvestigated.Inthiscase,theeffectofcondensationontheboundarylayerwasalsodiscussedindetail.Asaresultthesimulatedflowfieldswerecomparedwithexperimentaldataingoodagreement,andthevelocityandtemperatureprofileswerelargelychangedbycondensation.

简介：在2008年的MacWorld大会上,苹果公司的CEO斯蒂夫·乔布斯带着一个黄色的牛皮纸信封登场,在众人疑惑不解的目光中,他慢慢从信封内掏出了一台笔记本——MacBookAir,一时之间全场震撼,苹果的创意再次挑战了人们的想象力极限。

简介：Asthesourceoflife,waterisindispensabletohumanbeings.Beingawareofthewaterstressimposedbypopulationgrowth,climatechange,rapidurbanization,pollution,manyscholarsanddecisionmakersarguethattheestablishmentofwaterrightsandtheirsystemistheprimarymeasuretotacklethewatercrisisproblem.However,noconsensushasbeenreachedregardingthedefinition,natureandcontentofwaterrightsbothpracticallyandacademically.Byexaminingtheexistingtheoriesregardingwaterrights,thisarticletriestoredefinetheentitlementsfromtheaspectofcivillaw.Meanwhile,itprovidesasystemwhichclassifiesvariousrightsbythefourfunctionsofusufruct.

简介：Thepaperconcernswiththedesignphilosophy,feasibilitystudy,aswellassomepeculiarfeaturesofIWHRwatertunnelforcavitationresearch.Thehighlightsworth-mentioningarethemaximumvelocityof35m/sandReynoldsnumberof1×10~7aswellastheprovisionofaspeciallydesignedairresorber.

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简介：Basedonthe1stordercnoidalwavetheory,thewavediffractionaroundthepiergroupinshallowwaterisstudiedinthispaper.Theformulasforcalculatingthenonlinearwaveforcesarealsopresentedhere.Inordertoverifythetheoreticalresults,modeltestsareconductedinthewaveflumeinTheStateKeyLaboratoryofCoastalandOffshoreEngineeringlocatedinDalianUniversityofTechnology.TherangeofthewaveparametersintheexperimentsischaracteristicwaveperiodTg/d1/2=8.08-22.86,characteristicwaveheightH/d=0.10.45.Theresultsobtainedfromtheexperimentsagreewiththetheoreticalresultsquitewell.Itisshownthat,inshallowwaterthenonlinearwaveforcesactingonapiergrouparegreaterthanthosecalculatedbylinearwavetheory,thevalueofincrementinwaveforceincreaseswiththeincreasesofthenonlinearityofthewave.Inthewaverangestudiedinthispaper,thenonlinearwaveforcecanreachover4timestheforcecalculatecdbylinearwavetheory.Thus,itissuggestedthat,whenTg/d1/2>8,thewaveforceonthepiersinthepiergroupinshallowwatershouldbecalculatedbyusingthecnoidalwavetheory.

简介：WiththerapiddevelopmentofhighdamprojectswithinChina,thedragon-drop-tailspillwaytunnelisintroducedandwidelyused.Inviewofthehighwaterheadandthelargeflowvelocityonthedragon-drop-tailsection,aeratordevicesareusuallyplacedforthecavitationdamagecontrol.Forthedeviceplacedinitsinitialposition,itisaseriousconcerntodesignasuitableflowregimeofthecavityandtocontrolthecavityfillingwaterduetothelargeflowdepthandthelowFroudenumberthroughthisaerator.Inthisstudy,therelationshipsbetweenthegeometriesoftheaeratordeviceandthejetimpactangleofthelowertrajectoryoftheflowaretheoreticallyanalyzedwith/withoutalocalslope.Ninetestcaseswithdifferentgeometriesaredesigned,theeffectivenessofthefillingwatercontrolisexperimentallyinvestigatedunderdifferentoperationconditions,andtwocriteriaofthelocalslopedesignareproposed.Itisconcludedthatthecavityflowregimeandthefillingwatercanbeimprovedifasmallimpactangleandsomesuitablegeometriesofthelocalslopearedesigned.

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简介：实验的完整的因素的设计被开发以便调查喷气压力的效果，粗糙的混合率，切喂，并且在三个反应变量之上的板厚度，表面切完成穿地区，有条纹或刻痕之状态的百分比比例免费区域，和最大的宽度切。十六个实验的集合在每下列二可锻的材料上被执行：AISI4340(高力量低合金钢，变硬到49HRc)并且铝2219。变化(ANOVA)的分析在试验性的数据上被执行以便在性能措施上决定不同参数的效果的意义。它被发现那切喂并且厚度是高度有影响的参数，当粗糙的混合时，率仅仅在表面粗糙之上是有影响的。强壮的相互作用在喷气压力和细工品材料之间被发现。多标准数字优化被执行以便同时最大化/最小化表演措施的不同联合。

简介：在这研究，通过了台湾海峡的三热带气旋(TC)被分析；我们的结果与TC的紧张有关直接证明降水不是。从水预算的观点，潮湿流动集中主导、贡献为在在陆地上的海洋和几乎所有上的TC降水的70%潮湿，特别在TC发行量内。他们的空间分布也是类似的。蒸发在海洋上为降水贡献了30%潮湿，但是与时间改变了很少。潮湿流动集中能被划分成二部分：弯屈集中和潮湿移流。潮湿流动集中主要由于风集中，它在TC的西南的象限是主导的。潮湿移流位于北区域，并且当TC接近了陆地时，变得相对重要。潮湿流动集中和它的二部分在TC运动期间变化了，与乍见陆地加强和近在场的潮湿集中的收缩。三个TC盒子的垂直结构都显示潮湿集中主要在800hPa下面被限制到更低的空气，一个弱分叉区域在在550hPa附近的中间的对流层是在场的。

简介：CatalyzedbyAgNO3,Mgwasfoundforthefirsttimetobeabletomediatethecouplingreactionbetweenaromaticaldehydesandbenzylbromideorchlorideinwater.TheyieldswereslightlyhigherthantherecentresultsforMg-mediatedallylationdespitethefactthataqueousbenzylationisintrinsicallymuchharderthanallylation.Itwasalsofoundthatthecouplingreactionwaschemoselectiveforaromaticaldehydesoveraliphaticaldehydes,andchemoselectiveforaromaticaldehydesoveraromaticketones.

简介：Graphene为它的唯一的结构和性质作为新nano碳吸引了许多注意。然而，unfunctionalizedgraphene的生产和分散仍然是大挑战。此处，我们与低费用并且非为如此的graphene的准备和分散表明一个简单方法toxicum。这条途径被exfoliating石墨在乙醇/水混合物和单层和很少层graphenes的形成的稳定的分散完成。在混合的乙醇/水的比率被发现对脱落和分散过程关键。纯水或纯乙醇里的脱落不生产graphene。这个方法避免严厉氧化剂和表面活化剂的常规使用；因此，没有破坏，graphitic结构很好被维持。得益于乙醇和水的使用，由真空过滤或水花方法准备透明、传导性的graphene电影能是容易的，并且不需要处理以后的专辑移开杂质，它能为潜在的应用在是有益的电子，眼并且精力区域。

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简介：Theinceptionoftipvortexcavitationisverysensitivetowaterquality.Inordertoquantifytheeffectofwaterqualityontheinceptionoftipvortexcavitation,wedevelopamotionmodeltodescribethemigrationandgrowthofnucleiinwater.Ananalyticalsolutionofmigrationofnucleiinavortexflowisobtainedsothatthecapturetimesofvariousnucleicanbegivenoutdirectly.Acriterionisbuilttodeterminethecriticalnucleusinacertainnucleispectradistribution.Tensilestrengthofthecriticalnucleusisusedtoquantifytheeffectofwaterqualityandcorrectthetipvortexcavitationinceptionnumber.Finallythischangeofcavitationinceptionnumberiscomparedwithexperimentalresultstovalidateourmodel.

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