简介：Whenflowpassesoverafreeoverfallspillway,formsajet.Thisjetofflowwithahighvelocitymaycausescouratthedownstreamofspillway.Thescourholecharacteristicsisaffectedbyparameterslikedischargeintensity,dropheight,tailwaterdepth,sizeofbedmaterialandstandarddeviationofbedmaterial.Inthispaper,resultsofexperimentsonscourbelowfreeoverfallspillwayforuniformandnonuniformbedmaterialsarepresented.Itwasfoundthatscourholecharacteristics(i.e.maximumdepthofscour,distanceofmaximumscourpointfromspillway,widthofscourhole,distanceofendofscourholefromspillwayandheightofridgeformedatthedownstreamofscourhole)isafunctionofdensimetricFroudenumberandratioofdropheighttotailwaterdepth.Analysisofexperimentaldatawithuniformbedmaterialresultedinequationsforestimationofscourholecharacteristics.Furthercorrectionfactorswereintroducedinordertoconsidertheeffectofnon-uniformityofbedmaterial.

简介：ThispaperdetailstheresultsofajointprojectbetweenRolls-RoyceDeutschland(RRD)andtheNorthwesternPolytechnicalUniversityofChina(NWPU).Theobjectiveoftheprojectwasthedeterminationoftheinfluenceoftabulatorsinturbinebladecoolingpassagesonfilmholedischargecoefficients(Cdcoefficients).Alarge-scaleplexiglasmodelwasusedbytheNWPUtomeasuretheturbulatorinfluenceonCdcoefficientsforawiderangeofdifferentgeometricalparameters,Reynoldsnumbersandcoolingflowofftakeratios.RRDspecifiedthecomprehensivetestmatrixandanalysedthetestdata.TheCFDcodeFLUENTwasusedbyRRDfornumericalsimulationofthetestcaseswiththemainobjectivetosupporttheinterpretationofobservedtrends.Both,experimentalandnumericalresultswillbepresentedinthispaperforaselectionoftestconfigurations.

简介：Ｔｈｅ　ａｎａｌｙｓｉｓ　ｏｆ　ｄｉｓｋ　ｃｏｒｅ　ｆｒｏｍ　ｔｈｅ　Ｍａｏｐｉｎｇ　８００　ｍ　ｂｏｒｅ　ｈｏｌｅ（阮小平）（李方全）ＴｈｅａｎａｌｙｓｉｓｏｆｄｉｓｋｃｏｒｅｆｒｏｍｔｈｅＭａｏｐｉｎｇ８００ｍｂｏｒｅｈｏｌｅ￥Ｘｉａｏ－Ｐｉｎｇ...

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简介：UsingthemonodromytechniqueproposedbyMotlandNeitzke(.Adv.Theor.Math.Phys.7(2003)307),weinvestigatetheanalyticformsoftheasymptoticquasinormalfrequenciesforthemasslessscalarperturbationintheGarfinkle-Horowitz-Stromingerdilatonspacetime.WefindthattherealpartsofthequasinormalfrequenciesareTHln3.ThisagreeswiththatofthequasinormalmodesintheSchwarzschildspacetime.OurresultimpliesthatHod'sconjectureaboutIn3isstillvalidfortheblackholespacetimeinthestringtheory.

简介：兜售放射被看作量通道的一个过程。巨大的粒子“来自Garfinkle-Horowitz-Strominger黑洞的通道被调查。用JingyiZhang“sdeBroglie波浪方法，我们得到unthermai光谱，和结果与内在的单一的理论一致。

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简介：Westudyelectromechanicalfieldsintheanti-planedeformationofaninfinitemediumofpiezoelectricmaterialsof6mmsymmetrywithacircularcylindricalhole.Thetheoryofelectroelasticdielectricswithelectricfieldgradientintheconstitutiverelationsisused.Specialattentionispaidtothefieldsnearthesurfaceofthehole.

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