学科分类
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22 个结果
  • 简介:AccordingtotheNationalDevelopmentReformCommission(NDRC),thewholesociety'selectricityconsumptionisexpectedtocomeupto2400TWhthisyear.Inordertodecreasethecontradictionbetweensupplyanddemand,anewlycommissionedgeneratingcapacitynationwidewillbe65GWin2005.

  • 标签: 2005年 电力工业 电力需求 发展趋势
  • 简介:Theaddedmasscoefficientandthewaterlevelindexformulasforthesame-phaseandanti-phasevibrationofrectangularliquidtanks'bulkheadswerederivedbasedondrymodetheory.Threefluid-structureinteractionnumericalmethodsincludingFluidFEMandFluidBEMwereusedinthiscase.ThecomparisonofnumericalandtheoreticalresultsbythepresentmethodshowsthatANSYS/FluidS0ismorecredible,theNASTRAN/VirtualMassMethodismoresuitableforengineeringcalculationsandresultsofthesame-phasevibrationbythepresentmethodismoreaccurate.

  • 标签: added mass COEFFICIENT DRY mode theory
  • 简介:Inthispaper,theaddedmassofplatesandbeamstiffenedplatesvibratinginwateraresummarizedforthepurposeofconvenienceinengineeringdesign.Theanalyticalformulae,calculateddatatables,calculatedcurvesandsomeexperimentalresultsarepresented.

  • 标签: vibrating summarized tables CONVENIENCE walls RADIUS
  • 简介:TheaddedresistanceofKVLCC2inshortandregularheadwaveshasbeenstudiedtheoreticallyandexperimentally.Modeltestsareperformedtodeterminehowwelltheasymptoticformula(Faltinsenetal.1980)predictsthetypicallevelofaddedresistanceinshortwaves.Becausetheasymptoticformulaneglectstheeffectsofshipmotions,itiscombinedwiththeoreticalmethodstocalculatetheaddedresistanceinlongwavesusinganfunctiontopredicttheaddedresistanceintheintermediatewavelengthregionwherebothshipmotionsandwavereflectionareimportant.Auniquefeatureofthisexperimentisthattheshipmodelisdividedintothreesegmentstoexploretheaddedresistancedistributionwithrespecttohullsegment.Thispaperdiscussesthesensitivityofexperimentalresultstothequalityoftheincidentregularheadwaves.Moreover,anovelprocedureforanalyzingaddedresistanceisdescribed.Finally,theexperimentallydeterminedaddedresistanceofKVLCC2iscomparedwiththeoreticalresults.Itisshownthattheaddedresistancefromthecombinedtheoreticalmethodsagreeswellwithexperimentalresultsinboththeintermediateandshortwaveregions.Theuseofhullsegmentsshowsthataddedresistanceisconcentratedprimarilyatthebow.

  • 标签: 短波 实验确定 评价 船舶运动 渐近公式 波阻力
  • 简介:Inthispaper,addedresistancesactingonahullofnonballastwatership(NBS)inhighwavesisdiscussed.ThenonballastwatershipsweredevelopedatthelaboratoryoftheauthorsatOsakaPrefectureUniversity,Japan.Inthepresentpaper,theperformancesofthreekindsofbowshapesdevelopedfortheNBSweretheoreticallyandexperimentallyinvestigatedtofindthebestoneinhighwaves.Inpreviouspapers,anoptimumbowshapefortheNBSwasdevelopedincalmwaterandinmoderatedwaves.Fora2mmodelforexperimentsandcomputations,thewaveheightis0.02m.Thismeansthatthewaveheightis15%ofthedraftoftheshipinfullloadconditions.Inthispaper,addedresistancesinhighwavesupto0.07mfora2mmodelor53%ofthefullloaddraftareinvestigated.Insuchhighwaveslinearwavetheorieswhichhavebeenusedinthedesignstageofashipforalongtimemaynotworkwellanymore,andexperimentsaretheonlyeffectivetooltopredicttheaddedresistanceinhighwaves.Withthecomputationsforwaves,theshipisinafullycapturedconditionbecauseshorterwaves,λ/Lpp〈0.6,areassumed.

  • 标签: KEYWORDS added resistance non BALLAST water
  • 简介:Theadsorptioncapabilityofloamsoilfornano-TiO2affectedbytheamountandintensityofleachedwaterhasbeeninvestigatedbysimulatingthenaturalrainfallprocessundertheleachingcondition.Theresultsshowthattheamountandtheintensityofleachedwateraretwoimportantfactorsaffectingtheadsorptioncapabilityofloamsoilfornano-TiO2.Theresultsindicatethatthedepthoftheloamsoilcontainingamaximalamountofnano-TiO2isproportionaltotheamountofleachedwater,whileitisinverselyproportionaltotheintensityofleachedwater,ataconstantamountoftheleachedwater.Itwasalsofoundthattheadsorptioncapabilityofsoilsfornano-TiO2canbeimprovedbyaddingothermaterials,suchasdissolvedorganicmatter(DOM),bentoniteandstraw.ItwasfoundthatDOMisthebestsorbentforimprovingtheadsorptioncapabilityofloamsoilfornano-TiO2,followedbybentonite,whilestrawisnotsuitableforthemodificationofloamsoil.Theimprovementofadsorptioncapabilityofloamsoildependsontheamountoftheseadditives.Nano-TiO2canbeeffectivelyadsorbedonthesurfacelayerofloamsoilcontaininganappropriateamountofadditive.

  • 标签: 纳米二氧化钛 纳米吸收剂 吸附能力 土壤深度 溶解有机质 降雨过程
  • 简介:Weconstructphoton-subtracted(-added)thermovacuumstatebynormalizingthem.AstheirapplicationwederivesomenewgeneratingfunctionformulasofJacobipolynomials,whichmaybeappliedtostudyotherproblemsinquantummechanics.Thiswillalsostimulatetheresearchofmathematicalphysicsinthefuture.

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  • 简介:ThedistributionandtransformationofaddedandnativeNiinpurplesoilswereinvestigatedwithbothsequentialextractionprocedureandisotopictracertechnique.ThedistributionofaddedandnativeNiwasgreatlydependentonsoilproperties.LowsoilpHwasfavorableforsolubleplusexchangeable(EX)Fraction,whileFe/MnoxidesandclayforFe/Mnoxidebound(OX)andresidual(RES)fractions.TheaddedNi,however,hasnotyetreachedthedistributionequilibriumuptothe150thdayafterincubation.ThiswasreflectedinthefactthattheproportionofEXfractionfromaddedNiwas150%-600%asmuchasthatofnativeNi,whilethatofRESfractionwasonlyabout80%,Onceenteringsoil,theappliedsolubleNiwasrapidlytransformedintootherfractions,buttheorganiccomplexe(OM)fractionofaddedNiwasrelativelystableduringincubation.Thecarbonatebound(CAB)fractionshowedaprogressiveincreaseandattainedapeakvalueafter0-14dofincubationandthereafterdecreasedgradually.TheoccurrencetimeofthispeakadvancedasinitialsoilpHincreased.butthepeakwoulddisappearwheninitialsoilpHwashigherthan7.5(orcontainingfreeCaCO3).ThetransformationprocessesoftheEX,OXandRESfractionscouldbedescribedbyElovichandtwo-constantrateequations,andtheratewerepositivelycorrelatedwithsoilpH,CECandclay.ThesefindingcouldexplainwhytherearedifferencesinecologicalandenvironmentaleffectsofNiindifferentsoilsandatvariousintervals.

  • 标签: 四川 紫色土 土壤原有镍 添加镍 重金属 分布
  • 简介:Weconstructanewtypeofphoton-addedsqueezedcoherentstategeneratedbyrepeatedlyoperatingthebosoniccreationoperatoronanewtypeofsqueezedcoherentstate[FanHYandXiaoM1996Phys.Lett.A22081].Wefindthatitsnormalizationfactorisrelatedtosingle-variableHermitepolynomials.Furthermore,weinvestigateitsstatisticalproperties,suchasMandel’sQparameter,photon-numberdistribution,andWignerfunction.Thenonclassicalityisdisplayedintermsoftheintenseoscillationofphoton-numberdistributionandthenegativityoftheWignerfunction.

  • 标签: 光子数分布 压缩相干态 统计性质 WIGNER函数 HERMITE多项式 归一化因子
  • 简介:计算液体动力学(CFD)广泛地被用来学习gassolid使液化的水动力学;然而,它在liquidsolid使液化的应用是相对稀罕的。在这研究,liquidsolid的CFD模拟使流体化床被执行,集中于效果在liquidsolid使液化的水动力学上拖关联和增加的集体力量。拖关联,这被显示出模拟结果和关联上的重要效果由Beetstra等求婚了。(2007)与试验性的数据给最好的协议。我们进一步证明增加的集体力量确实在liquidsolid使液化的CFD模拟起一个重要作用,不应该因此在CFD模拟被忽略。

  • 标签: CFD模拟 附加质量力 流态化 拖动 流体力学 实验数据
  • 简介:<正>Weintroduceamodifiedsmall-worldnetworkaddingnewlinkswithnonlinearlypreferentialconnectioninsteadofaddingrandomly,thenweapplyBak-Sneppen(BS)evolutionmodelonthisnetwork.Westudyseveralimportantstructuralpropertiesofournetworksuchasthedistributionoflink-degree,themaximumlink-degree,andthegthoftheshortestpath.Wefurtherargueseveraldynamicalcharacteristicsofthemodelsuchastheimportantcriticalvaluefc,thef0avalanche,andthemutatingcondition,andfindthatthosecharacteristicsshowpanticularbehaviors.

  • 标签: POWER-LAW BEHAVIOR SMALL-WORLD network EVOLUTION model
  • 简介:在增值服务(管)上投资放大用户参予和站台利润。然而,投资资源通常在实践被限制。这篇论文调查管在投资资源限制下面为一个两方面的平台投资和定价策略。我们表明与管投资,赞助能仍然被做扩大用户需求,甚至当投资费用变得更高时。为最佳的定价策略,如果,网络效果将是统治决定因素在二个边缘的跨方面的好处之间的差距(即当时,用户们获得的利益各新的用户加入站台的另外的方面)大。有趣地,我们证明随边缘的投资费用的增加,用户们也可能更高被定价或降低。如果边缘的投资费用增加到高水平,和在二个边缘的跨方面的好处之间的差距大,为拥有更高跨方面的网络效果的用户降低存取费用未必确实补偿更高的费用引起的更多的利润损失。而且在管被开发以后,为谁的那些提起存取费用边缘的投资利益大未必确实也产生更多的利润。相反的策略进一步扩大用户用途,并且支持投资有益于更多的用户。

  • 标签: 投资成本 定价策略 资源约束 增值服务 平台 双边
  • 简介:EffectofaddedCo2+(aq)oncopperelectrowinningwasstudiedusingdopedpolyaniline(Pani)andPb-Ag(1%)anodesandastainlesssteelcathode.ThepresenceofaddedCo2+(aq)intheelectrolytesolutionwasfoundtodecreasetheanodepotentials.TheoptimumlevelofCo2+(aq)concentrationintheelectrolyte,withrespecttothemaximumsavingofpowerconsumptionwasestablished.Linearsweepvoltammetry(LSV)wasusedtostudytheinfluenceofaddedCo2+(aq)ontheanodicprocessesinacoppersulfate-sulfuricacidelectrolyte.Theoxygen-evolutionpotentialforPanianodeisdepolarisedatlowercurrentdensities(≤0.01A/cm2)andattainssaturationatρ(Co2+)o≈0.789g/L;whilsttheoxygen-evolutionpotentialforPb-Ag(1%)anodeisdepolarisedathighercurrentdensities(≤0.02A/cm2)andattainssaturationatρ(Co2+)o≈1.315g/L.Thepreferredorientationsofthecopperdepositschangefrom(220)to(111)withtheadditionof0.394?0.789g/LCo2+buthigherconcentrationsfavor(220)orientationagain.

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