简介：深海的turbidite隧道在石油探索和开发作为一个集中的问题吸引了许多注意。广泛的研究在turbidite隧道的建筑学上被执行了，并且大多数研究集中了于他们的几何形状，沉积过程和控制因素。然而，很少注意都没对分发模式，分发法律和turbidite隧道的合成的沙身体的量的研究被给予。作为一个例子拿尼日尔三角洲盆的一个斜坡区域，进行的这研究一对turbidite隧道的合成的沙身体的建筑学上的定量分析半量基于核心，好记载和地震调查。turbidite隧道系统能是限制被分类，这被显示出并且自由隧道系统。为限制隧道系统，垂直进化过程包含四个阶段。一个隧道系统的蜿蜒被斜坡控制，在他们之间的一种否定力量函数关系地。当斜坡坡度到达四度时，隧道系统是将近直的。在隧道建筑群以内基于移植方向和单个隧道的移植数量，隧道合成模式能被划分成四个类(侧面合成，在军队飞机合成，合成、垂直的秋千合成)并且几个子类。各种各样的隧道合成模式空间地显示出特定的分发法律。为在限制隧道系统的中间迟了的进化阶段的蜿蜒地流的隧道建筑群，在单个隧道之中的侧面的迁居显示出正直和继任的特征。在迟了的时期的单个隧道的蜿蜒在早时期比那大，并且当蜿蜒比五度大时，cut-offs可以局部地发生。这研究为地质的理论提供更好的理解深海沉积，并且也改进这类水库的利用好处。

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简介：AsimplecyclicelastoplasticconstitutivemodelforsandisproposedbasedontheUHmodelforoverconsolidatedclay.Theproposedmodelhasthefollowingfeatures.First,inordertodescribethestress-inducedanisotropyinsand,arotationalhardeningruleisintroducedfortheevolutionoftheyieldsurfaceaxiswithdevelopmentofplasticdeviatoricstrainintheprincipalstressspace.Second,therelationshipbetweentherotationalaxisandstress-inducedanisotropyismodeledbyintroducingtheslopeofrotationalaxisintotheyieldfunction.Theflatnessoftheyieldsurfacecanbedeterminedbytheslopeofrotationalaxis.Finally,arevisedunifiedhardeningparameterisproposedtoincorporatethestress-inducedanisotropy.Themodelcapabilityindescribingthecyclicresponseofsandisverifiedbycomparingthesimulationswithavailabletestresults.

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简介：Whippedup(激起)bystrongwinds,athickstormofchoking(令人窒息的)sandanddustturnedBeijing'sskiesfromgreytoyellowtoorangelastWednesday.

简介：Sandjetinnon-Newtonianviscoplasticfluidisassociatedwithanumberofindustrialandengineeringapplications,includingsandcappingforthereclamationofoilsandstailingspondsandsedimentdepositionintosoftmud.Inthisstudy,severalexperimentswerecarriedoutbydepositingcircularsandjetsverticallyintoviscoplasticfluids,knownasLaponitegel.Thedeformationregimesofsandjetsinthegelwereinvestigated.Theyield-gravityparameterofthedeformedsanddropinthegelwascomputed.

简介：Theprobabilitydistributionsofsandparticles'lift-offandincidentvelocitiesinawind-blownsandfluxplayveryimportantrolesinthesimulationofthewind-blownsandmovement.Inthispaper,theverticalandthehorizontalspeedsofsandparticleslocatedat1.0mmaboveasand-bedinawind-blownsandfluxareobservedwiththeaidofPhaseDopplerAnemometry(PDA)inawindtunnel.Basedontheexperimentaldata,theprobabilitydistributionsofnotonlytheverticallift-offspeedbutalsothelift-offvelocityaswellasitshorizontalcomponentandtheincidentvelocityaswellasitsverticalandhorizontalcomponentscanbeobtainedbytheequaldistancehistogrammethod.Itisfound,accordingtotheresultsoftheχ2-testfortheseprobabilitydistributions,thattheprobabilitydensityfunctions(pdf's)ofthesandparticles'lift-offandincidentvelocitiesaswellastheirverticalcomponentsaredescribedbytheGammadensityfunctionwithdifferentpeakvaluesandshapesandthedownwindincidentandlift-offhorizontalspeeds,respectively,canbedescribedbythelognormalandtheGammadensityfunctions.Thesepdf'sdependonnotonlythesandparticlediameterbutalsothewindspeed.

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简介：话题呈现水是万物之源,没有水,人类和动物就无法生存。因此,人人都有保护水资源和节约水资源的职责。某期刊正在开展以水为主题的征文活动,请你根据下面的信息写一篇短文参加征文。短文内容包括水的重要性、水的用途、水的现状及我们该如何保护水源和节约用水。

简介：水对于人们来说非常重要。我们必须每天喝水。没有水我们不能生存。水在我们周围随处可见。在家里，我们用水洗衣服、洗碗、做饭、打扫房间、制作饮料、刷牙、洗澡等。在工作中，人们用水灭火、种菜、在工厂做东西等。我们还可以在地球上游泳。水对我们很重要，不是吗？

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简介：Ｏｎｔｈｅｂａｓｉｓｏｆｐｒｅｖｉｏｕｓｒｅｓｅａｒｃｈａｎｄｐｒａｃｔｉｃｅ，ａｎｅｗｍｏｄｅｌｓａｎｄＢＺＹｈａｓｂｅｅｎｓｕｃｃｅｓｓｆｕｌｌｙｄｅｖｅｌｏｐｅｄ．Ｅｘｐｅｒｉｍｅｎｔｓｈａｖｅｂｅｅｎｃａｒｒｉｅｄｏｕｔｏｎｉｔｓｐｒｏｐｅｒｔｉｅｓ，ｉｎｃｌｕｄｉｎｇｕｎｉｔｗｅｉｇｈｔ，ｉｎｉｔｉａｔｉｏｎｖｅｌｏｃｉｔｙ，ｓｅｔｔｌｉｎｇｖｅｌｏｃｉｔｙ，ｒｅｐｏｓｅａｎｇｌｅ，ｅｔｃ．ＴｈｅｅｘｐｅｒｉｍｅｎｔｓｓｈｏｗｔｈａｔｔｈｅＢＺＹｍｏｄｅｌｓａｎｄｈａｓｍａｎｙｍｅｒｉｔｓｏｖｅｒｏｔｈｅｒｓ，ｓｕｃｈａｓａｄｊｕｓｔａｂｌｅｕｎｉｔｗｅｉｇｈｔ，ｗｉｄｅｒａｎｇｅｏｆｐａｒｔｉｃｌｅｓｉｚｅ，ｐａｒｔｉｃｌｅｓｈａｐｅｓｉｍｉｌａｒｔｏｎａｔｕｒａｌｓａｎｄａｎｄｓｔａｂｌｅｐｈｙｓｉｃａｌａｎｄｃｈｅｍｉｃａｌｐｒｏｐｅｒｔｉｅｓ．Ｔｈｕｓｉｔｈａｓｈｉｇｈｖａｌｕｅｆｏｒｓｔｕｄｙ，ｄｅｖｅｌｏｐｍｅｎｔａｎｄｅｘｔｅｎｓｉｏｎｆｏｒａｐｐｌｉｃａｔｉｏｎ．Ｓｔｉｌｌｓｏｍｅｏｆｉｔｓｐｒｏｐｅｒｔｉｅｓｎｅｅｄｔｏｂｅｆｕｒｔｈｅｒｓｔｕｄｉｅｄ

简介：Thestructuralpropertiesofwateratdifferenttemperatureshavebeeninestigatedusingaflexiblewatermodelintheisothermal-isobaricensemble.Withdecreasingtemperature,thetetrahedralityofthedistributionofthewatermoleculesaroundthecentralwatermoleculeisenhanced,andthehydrogenbondsbecomemorelinear.Bymeansofaconjugategradientenergyminimization,dynamicalconfigurationsatvarioustemperatureshavebeenmappedontonearbypotential-energyminima,the50°-60°peak(P1)inthedistributionfunctionoftheO-O-Oangleofatrimerbecomesfarsmaller.HoweverthereappearstobeasmallbutobservabletemperaturedependenceofP1,i.e.thehigherthetemperature,thehighertheP1intensity.

简介：Withthedevelopmentofscienceandtechnology,theresearchesandapplicationofwaterresourcesincludingthegaswaterhavebeenconstantlydeveloped.Throughananalysisontheflawsofthewaterrighttheory,andbyexecutingreconstructionandrenewalofthetheoryandsystemofwaterrightinmodernsociety,thewaterrightpositionofthegaswaterwillbeestab-lished,leadingtothematurityofthewholelaweffectivenessandsubstantialresultsofwaterright.

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