简介：Inthispaper,theauthorsobtainacharacteristicthatacompleteRiemannianmanifoldturnsintoahyperbolicspaceform.

简介：<正>AssociatedwitheachfinitedirectedquiverQisaquasi-hereditaryalgebra.theso-calledtwisteddoubleofthepathalgebrakQ.Characteristictiltingmodulesoverthisclassofquasi-hereditaryalgebrasareconstructed.Theirendonorphismalgebrasareexplicitlydescribed.Itturnsoutthatthisclassofquasi-hereditaryalgebrasisclosedundertakingtheRingeldual.

简介：Duringtherupturesofanearthquake,thestrainenergy.△E,.willbetransferredinto,atleast,threeparts,i.e..theseismicradiationenergy(E_s),fractureenergy(E_g),andfrictionalenergy(E_f),thatis,△E=E_s+E_g+E_f.Friction,whichisrepresentedbyavelocity-andstate-dependentfrictionlawbysomeresearchers,controlsthethreeparts.Oneofthemainparametersofthelawisthecharacteristicslipdisplacement.D_c.ItissignificantandnecessarytoevaluatethereliablevalueofD_cfromobservedandinvertedseismicdata.SinceD_ccontrolstheradiationefficiency.η_R=E_s/(E_s+E_g),thevalueofη_risagoodconstraintofestimatingD_c.Integratingobserveddataandinvertedresultsofsourceparametersfromrecordedseismograms.thevaluesofE_sandE_gofanearthquakecanbemeasured,thusleadingtothevalueofη_R.TheconstraintusedtoestimatethereliablevalueofD_cwillbedescribedinthiswork.AnexampleofestimatesofD_c.basedontheobservedandinvertedvaluesofsourceparametersoftheSeptember20,1999M_S7.6Chi-Chi(Ji-Ji).Taiwanregion,earthquakewillbepresented.

简介：Asanimportantstartingpointforpromotingnew-typeurbanizationandanimportantplatformforadvancingsupply-sidestructuralreform,characteristictownshavegainedstrongsupportatthenationalpolicylevelandhavebeenrapidlypromotedinpractice.However,ontheacademicresearchlevel,theresearchofcharacteristictownsislackofsystematic.Underthesecircumstances,thisarticlesummarizesthecurrentresearchonthecharacteristictowninourcountry,andmakesrelevantresearchandevaluation,withaviewtoprovidingreferenceandbasisforfurtherresearchonthecharacteristictown.

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简介：Turbiditycurrentsareflowsdrivenbysuspendedsedimentofflood-inducedturbidriverwaterwithexcessdensity.Suchcurrentsareoftenthegoverningfactorinreservoirsedimentationbytransportingfinematerialsoverlongdistancesanddeliveringthemajorityofdeposition,whichthusreducesthestoragecapacity.Therefore,thedesignandoperationofareservoirrequiresanaccuratepredictionofitsoccurrenceconditionandplungingposition,whichistheobjectiveofthepresentstudy.Thisarticlepresentsaverifiedalgebraicslipmixturemodelincludingmomentum,continuityandalgebraicvelocityexpressionstosimulate2-Dturbiditycurrents.Testexperimentsinamultiphaseflumewerecarriedout.Reynoldsnumber,sedimentconcentrationanddensimetricFroudenumberwereusedasparametersintheoccurrenceconditionanalysis.Theplungingofturbiditycurrentsmayproducerefluxandbackflowduetothedivingflowatthesurfaceoftheclearwater.ThesimilarexperimentalresultswerealsoobtainedbyPIVmeasurements

简介：ＡＣＨＡＲＡＣＴＥＲＩＳＴＩＣＡＮＡＬＹＳＩＳＯＦＡＥＲＯＳＯＬＳＦＲＯＭＳＡＮＤＳＴＯＲＭＳＹａｎｇＤｏｎｇｚｈｅｎ（杨东贞），ＷａｎｇＣｈａｏ（王超）ａｎｄＹｕＸｉａｏｌａｎ（于晓岚）ＩｎｓｔｉｔｕｔｅｏｆＡｔｍｏｓｐｈｅｒｉｃＣｈｅｎｍｉｓｔｒ...

简介：Manyapplicationsofultrasonic-assistedmethodswereusedduringmetalsolidification,buttheycouldnotbeintroducedintoweldpool.Inthispaper,awayofultrasonicassistedTIGweldingisintroduced.Bydirectlyimposedultrasonicvibrationonweldingarc,thevibrationinteractswitharcplasmaandpassestotheweldpool.Measurementresultsshowthatarcpressureissignificantlyincreasedwiththeultrasonicvibrationandthearcpressuredistributionmodelsarechanged.Bead-on-plateweldingtestsonSUS304confirmthatthistechnologycaninfluencethestyleofmetalmeltingandincreaseweldpenetrationdepth.

简介：AnexperimentalsystemofACarcdischargeinwaterwasdesignedwithpole-poleelectrodesandapeakvoltageof1500Vandatestcircuitwassetupusingvirtualinstrumenttechnology.ThemechanismofanACplasmaarcgeneratedinwaterwasanalyzed.ThevoltagecurrentcharacteristicoftheACplasmaarcwasobtainedfromthewaveform.Thetemperaturecharacteristicwastestedwithaspectrumdiagnosissystem,andtheeffectofdifferentelectrodematerialsonthestrikingvoltageandpeakcurrentwasanalyzed.Theresultsshowthatwhenapowersupplyof6kWisappliedonelectrodeswithagapof2mminwater,thestrikingvoltageisfrom900Vto1300V,thearcvoltageisfrom40Vto100V,thearccurrentisfrom2Ato7A,andthezerorestperiodisfrom1msto2ms.Inaddition,thearcvoltageandcurrentaredifferentforelectrodesinaluminum,copperandstainlesssteel.Thearcvoltageislowerandthecurrentishigherforanaluminumelectrodethanthoseforcopperandstainlesssteelones.Thehighesttemperatureofthearcis7643K.

简介：我们数字模仿繁殖行为和由使用细胞的自动机方法的在活动个人的流行传播的人分发特点。模拟结果证明那在那里存在感染的率波动的批评价值振幅，流行罐头在整个人口在上面传播了。而且，与感染的率波动的价值振幅增加，同时，感染的人口的空间分发展出不规则的螺线波浪和集中现象的自发的形成不同人口的密度将与时间自动地震荡。而且，特点动态当时，清楚地并且稳定地成长时间和感染的率波动的价值振幅增加。感染的个人的最大的比例独立于波动的振幅率的价值，这也被发现，但是与人口密度线性地增加。

简介：Asmostgenesequencesandfunctionalstructuresofinternalorgansinratshavebeenwellstudied,ratmodelsarcwidelyusedinexperimentalmedicalstudies.Alargenumberofdescriptionsandatlasoftherattemporalbonehavebeenpublished,butsomedetailedanatomyofitssurfaceandinsidestructuresremainstobestudied.Byfocusingonsomeuniquecharacteristicsoftherattemporalbone,thecurrentpaperaimstoprovidemoreaccurateanddetailedinformationonrattemporalboneanatomyinanattempttocompletemissingorunclearareasintheexistedknowledge.Wealsohopethispapercanlayasolidfoundationforexperimentalrattemporalbonesurgeries,andpromoteinformationexchangeamongcolleagues,aswellasprovidingusefulguidancefornoviceresearchersinthefieldofhearingresearchinvolvingrats.

简介：Thisthesishascarriedoncomparativeanalysistothepowercharacteristicof5kindsofinstitutionalframeworkofenterprisesatfirst,andhascarriedonthesurveytothedomesticandinternationaltrainofthoughtintheresearchaboutenterprise'spower,thenputsforwardthebasiccontradictioninenterprisesorganization("Thecontradictionsofthecomplexityofmanagement'stargetandpeople'slimitedreason")andessentialfeatureofcurrententerprise'spower("Solidificationofpower"),andthenhasputforwardnewtrainofthoughtinthestudyofenterprise'spowerandorganization("flowofpower"),finallyhasdesignedthewayanddirectionthatthepowerflowedinenterprises,Combiningenterprise'slifecycletheoryandAmericanscholarL.E.Greiner'smodelaboutorganizationdevelopment.

简介：<正>Propertiesofcontinuoussolutionsofasecondorderpolynomial-likeiteratedfunctionalequationaregivenbyconsideringitscharacteristic.Ausefulmethodtodiscussthegeneralcaseisdescribedindeedinthisprocedure.

简介：ThispaperproposestheRiceconditionnumbersforinvariantsubspace,singularsubspacesofamatrixanddeflatingsubspacesofaregularmatrixpair.Thefirst-orderperturbationestimationsforthesesubspacesarederivedbyapplyingperturbationexpansionsoforthogonalprojectionoperators.

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简介：ＬａｒｇｅｓｃａｌｅｃｈａｒａｃｔｅｒｉｓｔｉｃｄｉｓｔａｎｃｅｂｅｔｗｅｎｓｔｒｏｎｇｅａｒｔｈｑｕａｋｅＸＩＡＮＦＵＤＵ（杜先富）ＳＨＡＯＸＩＥＸＵ（许绍燮）ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓｉｃｓ，ＳｔａｔｅＳｅｉｓｍｏｌｏｇｉｃａｌＢ...

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简介：在这份报纸，我们在场波长看情况为可见轻通讯(VLC)为室内的multisource隧道推动反应建模的跟踪光线的算法。我们比较multisource和unisource隧道之间的multipath损失差别。当VLC从380nm保持一个宽系列到780nm，我们也分析延期散布了的根平均数平方(RMS)和三典型波长的平均时间延期，光谱墙的反射是波长依赖者。并且结果证明蓝色点亮射出二极管(带)与塑料墙在这个房间里比另外的波长拥有更大的通讯带宽。另外，三不同波长的路径损失被比较。

简介：Inthispaper,anewmethodfornumericallysolvingnonlinearconvection-dominateddiffusionproblemsisdevisedandanalysed.Thediscretetimeapproximationswithtimesteppingalongcharactcristicsarecstablishedandsolvedinspacesposscssingreproducingkernelfunctions.Ateachtimestep,theexactsolutionoftheapproximateproblemisgivenbyexplicitexpression.Thecomputationaladvantageofthismethodisthattheschemesareabsolutelystable,andareexplicitlysolvableaswell.Thestabilityanderrorestimatesarederived.Somenumericalresultsaregiven.