简介：Wepresentsecond-orderexpressionsforthefree-surfaceelevation,velocitypotentialandpressureresultingfromtheinteractionofsurfacewavesinwaterofarbitrarydepth.Whenthesurfacewaveshavenearlyequalfrequenciesandnearlyoppositedirections,asecond-orderpressurecanbefeltallthewaytotheseabottom.Thereareatleasttwoareasofapplications:reflectivestructuresandmicroseisms.Microseismsgeneratedbywaterwavesintheoceanaresmallvibrationsofthegroundresultingfrompressureoscillationsassociatedwiththecouplingofoceansurfacegravitywavesandtheseafloor.Theyarerecordedonland-basedseismicstationsthroughouttheworldandtheyaredividedintoprimaryandsecondarytypes,asafunctionofspectralcontent.Secondarymicroseismsaregeneratedbytheinteractionofsurfacewaveswithnearlyequalfrequenciesandnearlyoppositedirections.Theefficiencyofmicroseismgenerationthusdependsinpartonoceanwavefrequencyanddirection.Basedonthesecond-orderexpressionsforthedynamicpressure,asimpletheoreticalanalysisthatquantifiesthedegreeofnearnessinamplitude,frequency,andincidenceangle,whichmustbereachedtoobservethephenomenon,ispresented.

简介：Ineverusedtobelieveinfate.Ithoughtyoumadeyourownlife,anditwasakindofweaknesstoblamesomethingonfate.Butallthatchangedin1988.IhadbeenofferedafilmcalledSeeNoEvil,HearNo

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简介：Supposethatacontinuous27r-periodicfunctionfontherealaxischangesitsmonotonicityatpointsy_1:-π≤y_(2s)

简介：一、相同之处两者均可表示"几乎""差不多",均可修饰不定代词、形容词、副词、动词、介词短语等,此时两者常可换用。如:It’salmost[nearly]impossible.那几乎是不可能的。(修饰形容词)Healmost[nearly]alwaysarriveslate.他差不多总是迟到。(修饰副词)Hefellandalmost[nearly]brokehisleg.他摔了一跤,险些摔断了腿。(修饰动词)Almost[nearly]allthestudentspassedtheexam.差不多所有的学生都通过了考试。(修饰不定代词)

简介：让H是有限的组G的亚群。如果，H在G是将近嵌入SS的在那里存在G的S-quasinormal亚群K，以便HK是在G和HKH的S-quasinormal在哪儿的seG,HseG是H的亚群，由S-quasinormally在G被嵌入的H的所有那些亚群产生了。在这份报纸，作者在有限的组的结构上调查将近嵌入SS的亚群的影响。

简介：Theproblemofrelatingtheeigervaluesofann×nHermitianmatrixtothoseofitsRayleigh-Ritzapproximationisconsidered.ThesameresidualboundforunitarilyinvariantnormsonHermilianmatricesisobtainedevenwithouttheorlhonormalandRayleigh-RitzassumptionsinStewartandSun’sbook[9,TheoremIV.4.14].TheresultcanalsobeextendedtonearlyHermitianmatrices.

简介：NearlyorthogonalLatinsquaresareusefulforconductingexperimentseliminatingheterogeneityintwodirectionsandusingdifferentinterventionseachateachlevel.Inthispaper,someconstructionsofmutuallynearlyorthogonalLatinsquaresareprovided.Itisprovedthatthereexist3MNOLS(2m)ifandonlyifm≥3ndthereexist4MNOLS(2m)ifandonlyifm≥4withsomepossibleexceptions.

简介：InthispaperthelimitingdistributionoftheleastsquareestimatefortheautoregressivecoefficientofanearlyunitrootmodelwithGARCHerrorsisderived.Sincethelimitingdistributiondependsontheunknownvarianceoftheerrors,anempiricallikelihoodratiostatisticisproposedfromwhichconfidenceintervalscanbeconstructedforthenearlyunitrootmodelwithoutknowingthevariance.Togainanintuitivesensefortheempiricallikelihoodratio,asmallsimulationfortheasymptoticdistributionisgiven.

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简介：让T2k+1是有将近完美的匹配的2k+1顶点上的树的集合；α(T)是树T的代数学的连接。作者决定最大在T2k+1的树的代数学的连接的12价值。明确地，10树T2，T3，，T11；树T(1)的二个班；在T2k+1的T(12)被介绍。它在这被显示出为每树T1糊那[′]，T1[″]∈T(1)；T12[′]，T12[″]∈T(12)；每i，有2≤iα(Ti)>α(Tj)>α(T12[′])=α(T12[″])。它也与T∈T2k+1为每树T被看那(T(1)∪{T2，T3，，T11}∪T(12))，α(T12[′])>α(T)。

简介：StatisticsbulletinprovidedbytheStatePowerCorporationshowedthatinvestmentinpowernetworksbypowersystemsundertheStatePowerCorporationamountedto115.6billionyuanin2000.Itshared68.2%ofthenation’stotalfixedassetsinvestmentinpowersectors,whichhitthehighesthistorical

简介：实际兴趣的许多问题的几何学从圆形或椭圆形的弧被创造。弧边界元素能确切代表这些边界，并且因而，错误由表示用多项式形状功能的如此的几何学能被移开引起。为了充分利用圆形的边界，非退化的边界积分方程(BIEs)和一个将军的几何学，为弧元素可得到的非线性的转变技术被介绍外面移开或抑制不可分的核的单个或将近单个的性质。几个基准2Delastostatic问题证明现在的算法罐头有效地处理为边界层效果和薄墙的结构的问题发生在边界元素方法(BEM)的单个、将近单个的积分。由于准确几何表示的雇用，没有增加另外的更计算的努力，仅仅沿着边界和高精确性要划分的元素需要的一个小数字能被完成。[从作者抽象]

简介：AnefficientmethodforC2nearlyarc-lengthparameterizedcurveispresented.Anideaofapproximationforthearc-lengthfunctionofparametriccurvewhichinterpolatesCADdatapointsisdiscussed.Theparameterizationisimplementedbyusingparametertransformation.Finally,twonumericalexamplesaregiven.

简介：Somepropertiesofconvexconesareobtainedandareusedtoderiveseveralequivalentconditionsaswellasanotherimportantpropertyfornearlycone-subconvexlikeset-valuedfunctions.Undertheassumptionsofnearlycone-subconvexlikeness,aLagrangianmultipliertheoremonBensonproperefficiencyispresented.Relatedresultsaregeneralized.

简介：Electroncyclotronresonanceheating(ECRH),suchasthefundamentalheatingandthesecondharmonicheating,isabasicandpowerfulmethodtoheattheplasmaintokamakandstellaratordevices.Theoreticalstudiesofthisheatinghasbeendoneinratherearlyliteratures,however,theunderstandingofsomeimportantproblemsisstilluncertain.Theseinclude:thecouplingoftheO-modeandtheE-modeandtheroleofthiscouplinginwavedamping,theO-modedampingmechanism,

简介：Inthispaper,westudyHenigefficiencyinvectoroptimizationwithnearlycone-subconvexlikeset-valuedfunction.TheexistenceofHenigefficientpointisprovedandcharacterizationofHenigefficiencyisestablishedusingthemethodofLagrangianmultiplier.Asaninterestingapplicationoftheresultsinthispaper,weestablishaLagrangemultipliertheoremforsuperefficiencyinvectoroptimizationwithnearlycone-subconvexlikeset-valuedfunction.

简介：Weobtaintheexpressionsforsectionalcurvature,holomorphicsectionalcurvatureandholomorphicbisectionalcurvatureofaGCR-lightlikesubmanifoldofanindefinitenearlyKhlermanifoldandobtaincharacterizationtheoremsforholomorphicsectionalandholomorphicbisectionalcurvature.WealsoestablishaconditionforaGCR-lightlikesubmanifoldofanindefinitecomplexspaceformtobeanullholomorphicallyflat.

简介：Inthispaper,weproposeanearlyanalyticexponentialtimedifference(NETD)methodforsolvingthe2Dacousticandelasticwaveequations.Inthismethod,weusethenearlyanalyticdiscreteoperatortoapproximatethehigh-orderspatialdifferentialoperatorsandtransformtheseismicwaveequationsintosemi-discreteordinarydifferentialequations(ODEs).Then,theconvertedODEsystemissolvedbytheexponentialtimedifference(ETD)method.WeinvestigatethepropertiesofNETDindetail,includingthestabilityconditionfor1-Dand2-Dcases,thetheoreticalandrelativeerrors,thenumericaldispersionrelationforthe2-Dacousticcase,andthecomputationalefficiency.Inordertofurthervalidatethemethod,weapplyittosimulatingacoustic/elasticwavepropagationinmultilayermodelswhichhavestrongcontrastsandcomplexheterogeneousmedia,e.g.,theSEGmodelandtheMarmousimodel.Fromourtheoreticalanalysesandnumericalresults,theNETDcansuppressnumericaldispersioneffectivelybyusingthedisplacementandgradienttoapproximatethehigh-orderspatialderivatives.Inaddition,becauseNETDisbasedonthestructureoftheLiegroupmethodwhichpreservesthequantitativepropertiesofdifferentialequations,itcanachievemoreaccurateresultsthantheclassicalmethods.

简介：Theisotropyoranisotropyinsomephysicalpropertiesoftheammorphouspoly(ethyleneterephthalate)filmsuniaxiallydrawnattemperaturesaboveitsT_gandthenquenchedtoroomtemperaturehavebeenstudied.Experimentalresultsherepresentedshowthatthisamorphousstateofhighglobalchainorientationbutnearlyrandomsegmentalorientation,theGOLRstate,isnearlyisotropicinrefractiveindicesandYoung’smodulusforsmalldeformation,whileitisveryprobablyanisotropicinthermalconductionandmicrowavedielectricproperties.