简介:Thepresentpaperderivedtemperaturedistributionsinpowerseriesinasteadylaminarwakebehindaslenderstreamilinedheatedbodyofrevolution.Thetemperaturedistributionofthewakebehindthebodyfromx/d=2to70werefullyexploredusingarecirculatingwaterchannel.ThethermalwakepatternsbehingthebodywerevisualizedwiththeaidofinfraredpicturesandH2bubbles.
简介:GeometricprocesswasfirstintroducedbyLam^[10,11].Astochasticprocess{Xi,i=1,2,...}iscalledageometricprocess(GP)if,forsomeα>0,{a^i-1Xi,i=1,2,...}formsarenewalprocess.Inthispaper,theGPisusedtoanalyzethedatafromaseriesofevents.AnonparametricmethodisintroducedfortheestimationofthethreeparametersintheGP.Thelimitingdistributionsofthethreeestimatorsarestudied.Throughtheanalysisofsomerealdatasets,theGPmodeliscomparedwithotherthreehomogeneousandnonhomogeneousPoissonmodels.ItseemsthatonaveragetheGPmodelisthebestmodelamongthesefourmodelsinanalyzingthedatafromaseriesofevents.
简介:LetEbeacompacts-setsofR^n,TheauthorsdefineanorthonormalsystemФoffunctionsonEandobtainthat,foranyf(x)∈L^l(E1H^8),theFourierseriesoff1withrespecttoФ,isequaltof(x)atH^8-a.e-x∈E.Moreover,foranyf∈L^p(E,H^8)(p≥1),thepartialsumsoftheFourierseries,withrespecttoФ,offconvergestofinL^P-norm.
简介:为奥本海姆系列epansions,作者[7]讨论了非凡的集合B_m={x∈(0,1]:1<(d_j(x))/(h_(j-1)(d_(j-1)(x)))为任何j≥的≤m2}。在这篇论文,我们调查发生在alternatingOppenheim系列扩大的一种非凡的集合的Hausdorff尺寸。作为应用,我们得到集合inLueroth系列扩大的准确Hausdorff尺寸,也,我们给如此的维的数字的估计。
简介:Basedonthestrongearthquakecatalogue,thispaperdiscussesthecharacteristicsofthetimeseriesofstrongearthquakeactivitiesintheworld,westernChinesemainlandanditsperipheral"bigtriangleseismicregion",aswellastheChinesemainland.AccordingtotheanalysisoftheperiodicfeaturesofglobalseismicityofM≥8.0strongevents,itisfoundthatthereissignificantdifferenceinglobalseismicitybeforeandafterthe1960s.StatisticalanalysiswiththeFishermethodhasrevealedthatthe"bigtriangularseismicregion"hasexperiencedaprocessofM8.0earthquakeactivitywithadurationofoverahundredyearssince1800.Furtheranalysisshowsthattheglobalseismicityandthe"bigtriangularseismicregion"possiblyhasaperiodofahundred-yearscale,andhasquasisynchronicitytoacertainextent.TheshallowearthquakeactivityofMS≥7.0intheChinesemainlandisobviouslycontrolledbytheseismicityinthebigtriangularseismicregionandbyglobalseismicityinalargerspatial-scale.Intermsofthetimeseriesoftheseearthquakes,theseismicityshowsadecadalandcentury-scaleactivitypatterns.
简介:Covarianceofcleansignalandobservednoiseisnecessaryforextractingcleansignalfromatimeseries.Thisistransferredtocalculatethecovarianceofobservednoiseandcleansignal'sMAprocess,whenthecleansignalisdescribedbyanautoregressivemovingaverage(ARMA)model.Usingthecorrelationsoftheinnovationsdatafromobservedtimeseriestoformaleast-squaresproblem,aconciselyautocovarianceleast-square(CALS)methodhasbeenproposedtoestimatethecovariance.Wealsoextendedourw...
简介:Theconceptofconvextypefunctionisintroducedinthispaper,fromwhichakindofconvex-decompositionapproachisproposed.Asoneofapplicationsofthisapproach,theapproximationoftheconvextypefunctionbythepartialsumofitsFourierseriesisinvestigated.Moreover,theorderofapproximationisdescribedwiththe2thcontinuousmodulus.
简介:Veryrecently,Yu,LeandZhouintroducedthesocalledΔ*B1andΔ*B2conditions,whicharegeneralizationsofthemonotonecondition.Byapplyingthesetwonewconditions,theauthoressentiallygeneralizestheclassicalresultsofChenonthenecessaryandsufficientconditionsoftheLpintegrabilityoftrigonometricseries.Infact,thepresentpapergivesthefirstresultonthenecessaryandsufficientconditionsoftheLpintegrabilityoftrigonometricseries,wherecoefficientsmayhavediffierentsigns.
简介:一个简单方法被建议为一个系列串联控制系统设计P/PI控制器为不稳定首先订正时间延期(FOPTD)系统。在这份报纸,为与稳定/不稳定的FOPTD系统在系列串联的不稳定的FOPTD系统的控制器设计被考虑。建议方法基于等同s和s的相应力量的系数2为一个伺服问题在靠近环的转移的分母的到乘那些的1和2的分子工作。开的环系统由与一个稳定/不稳定的FOPTD系统在系列串联的一个不稳定的FOPTD系统组成。仅仅二调节参数(1和2)为控制器的设计被要求。靠近环的表演为伺服和规章的问题被评估,表演被发现比很好确定的合成方法的好。为在模型参数的无常的坚韧性被学习并且由合成方法与控制器的相比设计了。
简介:格局颠覆者“在过去近40年中,BMW3系总共赢得了1350万全球客户的钟爱,奠定了不可动摇的领先地位。如今,它再度完成自我超越,一定会赢得中国消费者的认可和欢迎。”——华晨宝马汽车有限公司总裁兼首席执行官康思远