简介：Thespectralpropertiesofnonlineardragforcesofrandomwavesonverticalcircularcylindersareanalyzedinthispaperbymeansofnonlinearspectralanalysis.Theanalysisprovidesbasicparametersforestimationofthecharacteristicdragforces.Numericalcomputationisalsoperformedfortheinvestigationoftheeffectsofnonlinearityofthedragforces.TheresultsindicatethatthewavedragforcescalculatedbylinearwavetheoryarelargerthanthosecalculatedbythethirdorderStokeswavetheoryforgivenwaves.Thedifferencebetweenthemincreaseswithwaveheight.Thewavedragforcescalculatedbyuseoflinearapproximationareabout5％smallerthantheiractualvalueswhenmeasuredinthepeakvaluesofspectraldensities.Thiswillresultinasafetyproblemforthedesignofoffshorestructures.Therefore,thenonlineareffectofwavedragforcesshouldbetakenintoconsiderationindesignandapplicationofimportantoffshorestructures.

简介：length of a sentence in advertising is usually short. A sentence in daily consumer goods ads has 10.3 words on average,and language. It is a more common case that an advertisement is a mixture of the three. In radio advertisements,there are some differences in the use of these pronouns in the three kinds of advertisements. The first person we almost never occurs in daily consumer goods ads and technical equipment ads

简介：ThemethodofproducingacompleteMRIimageisbasedontheanalysisoffreeinductiondecay.ItmainlystudieswhenandhowmagneticvectorrevestsitsinitialstateafterRFpulse,butneglectstheeffectoftheRFform.Inthispaperwemainlystudythis.WegivethemathematicexpressionofRFpulsewhichcantheoreticallyimproveimage（?）ality.InMRI,B1（t）isthealternateelectromagneticexcitationfield,itcanbeexpressedasfollows:

简介：Inthispaper,thej,υcorrectedformulaeoftheamplitudesandthephasesof58astronomicalconstituentsaregiven,andthemodelsfortheanalysisandpredictionof169constituentsarepresented.ThenewCartwright’scalculatedresultsofthetidalpotentialareused,andthequadraticanalysisismade.Ithasbeenprovedbyanumberoftrialsthattheharmonicconstantsofconstituentsaremorestableandtheaccuracyofthepredictedresultreliable.

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简介：ByreferenceoftheevaluativedataofforestbiodiversitychangesinChinafrom1973to1998,thevariationanalysismodelsofthepressureindexofforestbiodiversity,forestecosystemdiversityandforestspeciesdiversity,aswellasthegeneralindexofforestbiodiversityaredevelopedusingStatisticalPackagefortheSocialSciences(SPSS).Furthermoreestablishedistherelevantmodelofmutationofforestdiversitypotentialfunctions.Thispaperpointsoutthatchangesofforestbiodiversity...

简介：AnewmethodofphasespectralanalysisofEEGisproposedforthecomparativeanalysisofphasespectrabetweennormalEEGandepilepticEEGsignalsbasedonthewaveletdecompositiontechnique.Byusingmultiscalewaveletdecomposition,theoriginalEEGsaremappedtoanorthogonalwaveletspace,suchthatthevariationsofphasecanbeobservedatmultiscale.Itisfoundthatthephase(andphasedifference)spectraofnormalEEGsaredistinctfromthatofepilepticEEGs.Thatisthevariationsofphase(andphasedifference)ofnormalEEGshaveadistinctperiodicpatternwiththeelectricalactivityproceedsinthebrain,butdonottheepilepticEEGs.ForepilepticEEGs,onlyatthosetransientpoints,thephasevariationsareobvious.Inordertoverifytheseresultswiththeobservationaldata,thephasevariationsofEEGsinprincipalcomponentspaceareobservedandfoundthat,thefeaturesofphasespectraisincorrespondencewiththatthewaveletspace.TheseresultsmakeitpossibletoviewthebehaviorofEEGrhythmsasadynamicspectrum.

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简介：Triangularsystemsplayafundamentalroleinmatrixcomputations.Ithasbecomecommonplacethattriangularsystemsaresolvedtobemoreaccurateeveniftheyareill-conditioned.Inthispaper,wedefinestructuredconditionnumberandgivestructured(forward)perturbationbound.Inaddition,wederivetherepresentationofoptimalstructuredbackwardperturbationbound.

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简介：ＢｉｎｏｍｉａｌｍｏｄｅｌｏｎｓｅｉｓｍｉｃｒｉｓｋａｎａｌｙｓｉｓＪｉａｎＷＡＮＧ（王健）ａｎｄＺｈｅｎ－ＬｉａｎｇＳＨＩ（时振梁）（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓｉｃｓ，ＳｔａｔｅＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕ，Ｂｅｉｊｉｎｇ１００...

简介：TheenvironmentofthepostalindustryinChinahasexperiencedtremendouschangesinthepastfewyears.TheenvironmentalchangeshavesomeeffectsontheelementsthatdecidetheservicestructureofChinaPost.Insuchcontext,thecurrentservicestructureofChinaPostneedssomeimprovementstoadaptitselftothechangingenvironment.AimingattheoptimizationoftheservicestructureofChinaPost,thispaperreviewsthelawofitsdevelopmentandmakesananalysisofitscurrentcharacteristicsandtheexistingproblems.

简介：在由Brackx的最近的报纸，Delanghe；Sommen，一些基本更高维的分布在克利福德分析的框架被重新考虑，最后在欧几里德几何学的空格导致新分布的四个宽广的类的介绍。在当前的纸，我们继续这些分布的深入的学习，更明确地他们在频率空间的行为的学习，泛音分析的因此延长的古典结果。

简介：Byexpandingtheperturbationofcovariancematrixinthepowersofer-rorterm,theinfluencefunctionsforfivecanonicalmeasurementsinCCAaredevel-opedandthreesampleversionsaregiven.Forgeneralizedcorrelationcoefficientp_z,theinfluencefunctionisaquadraticformofr.v.z,anditsdistributionisconsidered.ApracticalexampleiUustratestheutilityoftheproposedinfluencefunctions.

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简介：ＳｏｌｉｄＭｏｄｅｌｉｎｇＥｒｏｒ：ＡｎａｌｙｓｉｓａｎｄＣｏｍｐｅｎｓａｔｉｏｎ①ＸｕＺｈｉｇａｎｇＨｕａｎｇＫｅｚｈｅｎｇＡｉＸｉｎｇＳｈａｎＬｉａｎｙｅＣｏｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，ＳｈａｎｄｏｎｇＵｎｉｖｅｒｓｉ...

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简介：Objective:Tosummarizethereconstructionexperienceoftheelectricalinjuriesinemergency.Methods:All309woundsin105patientswhosufferedfromelectricalinjurieswerereviewedduringa10yearperiodfromJan.1st1986toDec.31st,1996.Treatmentmethod,patientdataandresultswerecomparedandanalyzed.Acomprehensiveurgentreconstructionalternativeusedinallcasesincludedthefollowings,1)debridingthewoundinemergency,2)preservingthevitaltissuesasmuchaspossible,evendevitalizedtissuesorlocalnecrosis,3)transplantingthesevitaltissuesduringthefirstsurgeryifthefunctionalreconstructionrequired,4)nourishingthewoundbedbytissueflapscoveringwithrichbloodsupply,5)improvingflapsurvivalbycontinuousirrigationfor24-720hoursbeneaththeflapswithacompoundmedicineaftersurgery.Results:Satisfactoryresultswereobtainedwiththeextremitylossratiooflessthan7%inthisgroupcomparedwith42.5%whichwas10yearsbefore1984inthesamehospital.Conclusions:Thisurgentcomprehensivereconstructionalternativeisaneffectiveandworkablemethodforreducingextremitylossofelectricalinjuries.

简介：Inthispaper,supposingthatthereceivedsignalsattheinputareoftheformv（t）=s1[t,x1（t）]s2[t,x2（t）]+n（t）wheresiareFMsignals（i=1,2）,anovelcross-coupledphase-lockedloop（CCPLL（M））anditsmathematicalmodelareobtained.Theglobalqualitativestructuralanalysisofthemathematicalmodelofthefirst-orderloop,theacqui-sitionregionandsynchronizationregionofthefirst-orderloop,andthesynchronizationregionofthesecond-orderloopareobtained.