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500 个结果
  • 简介:Inthispaper,theforecastingequationsofa2nd-orderspace-timedifferentialremainderarededucedfromtheNavier-StokesprimitiveequationsandEulerianoperatorbyTaylor-seriesexpansion.Hereweintroduceacubicsplinenumericalmodel(SplineModelforshort),whichiswithaquasi-Lagrangiantime-splitintegrationschemeoffittingcubicspline/bicubicsurfacetoallphysicalvariablefieldsintheatmosphericequationsonsphericaldiscretelatitude-longitudemesh.Anewalgorithmof'fittingcubicspline—timestepintegration—fittingcubicspline—……'isdevelopedtodeterminetheirfirst-and2nd-orderderivativesandtheirupstreampointsfortimediscreteintegraltothegoverningequationsinSplineModel.AndthecubicsplinefunctionanditsmathematicalpolaritiesarealsodiscussedtounderstandtheSplineModel’smathematicalfoundationofnumericalanalysis.ItispointedoutthattheSplineModelhasmathematicallawsof'convergence'ofthecubicsplinefunctionscontractingtotheoriginalfunctionsaswellasits1st-orderand2nd-orderderivatives.The'optimality'ofthe2nd-orderderivativeofthecubicsplinefunctionsisoptimalapproximationtothatoftheoriginalfunctions.Inaddition,aHermitebicubicpatchisequivalenttooperateonagridfora2nd-orderderivativevariablefield.Besides,theslopesandcurvaturesofacentraldifferenceareidentifiedrespectively,withasmoothingcoefficientof1/3,three-pointsmoothingofthatofacubicspline.Thentheslopesandcurvaturesofacentraldifferencearecalculatedfromthesmoothingcoefficient1/3andthree-pointsmoothingofthatofacubicspline,respectively.Furthermore,aglobalsimulationcaseofadiabatic,non-frictionaland'incompressible'modelatmosphereisshownwiththequasi-LagrangiantimeintegrationbyusingaglobalSplineModel,whoseinitialconditioncomesfromtheNCEPreanalysisdata,alongwithquasi-uniformlatitude-longitudegridsandtheso-called'shallowatmosphere'Navier-Stokesprimitiveequationsinthes

  • 标签: NUMERICAL forecast and NUMERICAL SIMULATION 2nd-order
  • 简介:Overthepastthreeorfouryears,severalprominentcommentatorshavemadesomeastonishingclaims,andwiththehelpofthemedia,manypeoplenowbelievethattheglobalorderhasdramaticallychangedbecauseofChina.OnefamousU.S.scholarofinternationalpoliticsstartedtheideaofG2,sayingthatonlytheU.S.and

  • 标签: 中国 秩序 世界 国际政治 发生变化 发言权
  • 简介:TheorderofmagnitudeofmultipleFouriercoefficientsofcomplexvaluedfunctionsofgeneralizedboundedvariationslike(Λ1,,ΛN)BV(p)andr-BV,over[0,2π]N,areestimated.

  • 标签: 傅立叶系数 幅度 广义界 值函数 估计
  • 简介:Yttriumaluminumgarnet(YAG)transparentceramicswerefabricatedbysinteringatoxygenatmosphere.Tetraethylorthosilicate(TEOS)wasaddedasthesinteringadditivetocontrolthegraingrowthanddensification.Poreswereeliminatedclearlyattemperaturelowerthan1700oC,whilegrainsizewasaround3μm.Thein-linetransmittancewas80%at1064nmwhensamplesweresinteredat1710oC.TheeffectofTEOSwasstudiedinoxygenatmospheresinteringforNd:YAGtransparentceramics.Athighertemperaturelike1710oC,thegraingrowthmechanismwassolutedrag,whileat1630and1550oCthegraingrowthwascontrolledbyliquidphasesinteringmechanism.And0.5wt.%TEOSwasthebestaddingcontentforNd:YAGsinteredinoxygenatmosphere.

  • 标签: Nd YAG陶瓷 烧结助剂 氧气氛 晶粒生长 TEOS
  • 简介:UsingNevanlinnatheoryofthevaluedistributionofmeromorphicfunctionsandWiman-Valirontheoryofentirefunctions,weinvestigatetheproblemofgrowthorderofsolutionsofatypeofsystemsofdifferenceequations,andextendsomeresultsofthegrowthorderofsolutionsofsystemsofdifferentialequationstosystemsofdifferenceequations.

  • 标签: 差分方程 系统 增长阶 函数理论 亚纯函数 微分方程
  • 简介:与它的主要的图联系的有限的组G的度模式被Moghaddamfar在2005介绍了,下列简单的组被他们的顺序和度模式特别地决定,这被证明:所有分散的简单的组,轮流出现的组Ap(p5是一个成双的素数)并且谎言的一些简单的组打字。在这份报纸,作者继续这调查。特别地,作者证明对称的组Sp+32是的p+4是的合成数字和p+一个素数并且97

  • 标签: 有限群 学位 订单 孪生素数 作者 对称群
  • 简介:Ifweusedifferentperspectivestolookatthecurrentinternationalstrategicorderandbigpowerrelations,wewillarriveatdifferentconclusions.LookingattheU.S.’upsanddowns,itmightlookliketheinternationalstrategicorderhasn’tchangedfortheU.S.,itisstilltheonlysuperpower.However,ifwelook

  • 标签: 国际秩序 国际战略 国际政治
  • 简介:Weliveinaworldwhichchanginginallrespects.Someaspectsoftheglobalorderareobviouslychanging.Someofthesechangesarenotyetcompleteastherehasnotyetbeenanyessentialchangeinqualityorquantity.First,theglobalorderischangingintermsofnumbers.Theglobalorderandstrategicconfigurationisaboutthedistributionofpowerandbigpowerrelationsinrelationtothatdistribution.Inthisregard,changeisconstant.Theproportionofdevelopedcountriesatthetophasbeensteadilydeclining,meanwhile,theproportionofdevelopingcountries,includingnewlyemergingeconomics,isrising.Tenyearsago,theeconomiesofthedevelopedcountries(namelytheU.S.,EuropeandJapan)accountedfor60-70%oftheworldtotal,butthefiguretodayislessthan60%.Theworldismovingtowardasituationinwhichthedevelopedanddevelopingcountrieseachholdabout50%oftheworldeconomy.

  • 标签: 秩序 中国 元素
  • 简介:摘要目的观察NDYAG激光在浅层楔状缺损中的临床效果。方法将58名患者共计90颗浅层楔状缺损患牙分两组A组常规光敏树脂充填组,B组激光+树脂充填组。治疗后12个月复查,对两组充填成功率进行统计分析。结果激光+树脂充填组成功率高于单纯光敏树脂充填组,两者比较有显著差异。结论脉冲NDYAG激光照射后在行充填治疗比单纯充填治疗可提高成功率,减少牙齿敏感症状。

  • 标签: NDYAG激光 楔状缺损 牙齿敏感
  • 简介:这份报纸建议为不明确的系统滑动模式(HOSM)控制器的一份适应不可分的更高的订单。而不是常规控制输入,控制输入的衍生物在建议控制法律被使用。在控制器的不连续的符号函数被做对控制输入的时间衍生物起作用。集成衍生物控制信号获得的实际控制信号光滑、啁啾免费。在建议控制器使用的适应调节法律消除系统无常的上面的界限的优先的知识的需要。建议控制器的稳定性和坚韧性被使用古典Lyapunov标准证明。模拟结果表明建议控制计划的优点。

  • 标签: 滑模控制器 不确定系统 自适应 高阶 积分 LYAPUNOV
  • 简介:Inthispaper,weextendtheapplicationsofproperorthogonaldecomposition(POD)method,i.e.,applyPODmethodtoamixedfiniteelement(MFE)formulationnaturallysatisfiedBrezz-Babuskaforparabolicequations,establishareduced-orderMFEformulationwithlowerdimensionsandsufcientlyhighaccuracy,andprovidetheerrorestimatesbetweenthereduced-orderPODMFEsolutionsandtheclassicalMFEsolutionsandtheimplementationofalgorithmforsolvingreduced-orderMFEformulation.Somenumericalexamplesillustratethefactthattheresultsofnumericalcomputationareconsistentwiththeoreticalconclusions.Moreover,itisshownthatthenewreduced-orderMFEformulationbasedonPODmethodisfeasibleandefcientforsolvingMFEformulationforparabolicequations.

  • 标签: MFE POD 降阶 抛物方程 配方 抛物型方程
  • 简介:Ahigh-repetitionratemasteroscillatorpoweramplifierpumpedwithlaserdiodes(LDs)isreported.Aninjectionseedingsingle-frequencyelectro-opticalQ-switchedNd:YAGlaserisusedasanoscillator,andaconductivelycooledNd:YAGzigzagslabwithabounce-pumpedarchitectureisutilizedasapoweramplifier.Pulseenergiesofover800mJat1064nmand400mJat532nm,correspondingtoaveragepowersof200and100W,respectively,areachievedwitha12.6-nspulsewidthat250Hz.Outputfrequencyfluctuationsandsingle-frequencyoperationarefurthermonitored.Experimentalresultsrevealthattheproposedsystem,whichfeaturesasingle-passamplifiedconfiguration,isapromisingdesignforspace-basedapplications.

  • 标签: Nd YAG激光器 激光二极管泵浦 主振荡器 锯齿形 主放大器
  • 简介:Themainpurposeofthisarticleistostudytheexistencetheoriesofglobalmeromorphicsolutionsforsomesecond-orderlineardifferentialequationswithmeromorphiccoefficients,whichperfectthesolutiontheoryofsuchequations.

  • 标签: 二阶线性微分方程 亚纯解 纯系 微分方程解
  • 简介:在这篇文章,用概括加权的平均数和顺序m的差别矩阵,我们介绍paranormed顺序空间(u,v,p;(m)),它由概括了加权的(m)差别工具的序列组成被I.JMaddox在线性空间(p)定义。另外,我们决定这个空格的基础并且计算它的,-并且-duals。进一步,我们给矩阵mappings的班的描述从(u,v,p,(m))到,c和c0。最后,我们使用noncompacness的Hausdorff措施描绘矩阵在空格p上给的紧缩的操作符的一些类(u,v,(m))(1p<)。

  • 标签: 加权平均值 序列空间 广义加权 差分序列 运营商 紧凑型
  • 简介:Basedonthestochasticmarketdemand,thispaperconsiderstheorderdecision-makingstrategiesofthesupplychainbyintroducingstatementstrategies.Consequently,thetime-variantvarianceinthedemandsofthemarketisincorporatedintothemodel.Theretailersimultaneouslydeterminesthepurchasetime(i.e.,leadtime)andorderquantity,andthemanufacturerdeterminesthestatementstrategyandthereservedprofitrate.Theresultsshowthatthenoovertimestatementstrategycaninducetheretailertoplacemoreordersinadvancebylimitingtheavailableorderquantitywithintheavailabletime.Finally,wealsoadoptnumericalexamplestosupporttheconclusionofthispaper.

  • 标签: 市场需求 随机序 语句 决策 时间变化 零售商