简介：Thecompletelypositivematricesareimportantinthestudyofblockdesignsarizingincombinatorialanalysis(see[11])andarerelatedtocopositivematrices,whichhaveappli-cationsincontroltheoryandinmultimobicalprogramming(see[12]).Ann×nmatrixAissaidtobecompletelypositiveifAcanbefactoredasA=BB~Tforsomen×mrealmatrixBwithnonnegativeentriesforsomem<∞.IfAisacompletelypositivematrix,thenthesmallestnumberofcolumnsinanonnegativematrixBsuchthat

简介：LetAbeann×nrealsymmetricmatrix.Aiscalledcompletelypositive(denoteA∈CP_n)ifA=B’Bforsomem×nnonnegativematrixBwheremisanintegeranddenotes

简介：<正>Inthispaper,weprovethatthesetofallfactorizationindicesofacompletelypositivegraphhasnogaps.Inotherwords,wegiveanaffirmativeanswertoaquestionraisedbyN.KoganandA.Berman[8]inthecaseofcompletelypositivegraphs.

简介：InthisarticlethespectrumofsupportsizesofacompletelydecomposableTS(ν,,4)foranypositiveintegerν≡1,3(mod6)isdetermined.

简介：OnDecember25,2000,thelastgeneratingunitinTianshengqiaoIHydropowerStationcompleted72hoursoftrialoperationinparallelwithpowernetwork.UPtothisday,thegeneratingunitsinthisstationhadbeencompletelybuiltupandputintooperation.ThetotalinstalledcapacityofTianshengqia

简介：Inthispaper,anewcompletelyintegrablesystemrelatedtothecomplexspectralproblem—φ_(xx)+(i/4)uφ_x+(i/4)(uφ)_x+(1/4)vφ=iλφ_xandtheconstrainedBowsoftheBoussinesqequationsaregenerated.AccordingtotheviewpointofHamiltonianmechanics,theEuler-LagrangeequationsandtheLegendretransformations,areasonableJacobi-Ostrogradskycoordinatesystemisobtained.Moreover,bymeansoftheconstrainedconditionsbetweenthepotentialu,vandtheeigenfunctionφ,theinvolutiverepresentationsofthesolutionsfortheBoussinesqequationhierarchyaregiven.

简介：Theself-extinguishingbehaviorofkerosenesprayfirewasinvestigatedinacompletelyenclosedcompartmentwiththesizeof3m×3m×3.4m.ThespraywasgeneratedbylocatingoneBETEnozzleatthecenterofthebottomwall.AseriesofsprayfirevideoswereobtainedbychangingBETEnozzletypeandinjectingpressure.Theresultsshowthatsprayfireundergoesfourstages:thegrowthstage,thequasi-steadystage,thestretchstageandtheself-extinguishingstage.Consumptionoflargequantitiesofoxygencausessprayfiretofirstbestretchedandthenquench.Inthisprocess,firebasemigratesawayfromsprayregionandleadstotheemergenceofghostingfire.Ghostingfirepromotestheinstabilityofsprayfireandlargefluctuationofitsheight,whichprovideshelptoitsself-extinguishing.Withincreasingtheinjectingpressureorthenozzlediameter,theself-extinguishingtimedecreases.Itisfoundthattheself-extinguishingtimeisapproximatelyininverserelationwithinjectingflowrate.Additionally,wealsoobservedtheoccurrenceoftwo-phasedeflagrationjustafterignition,anditacceleratesthesprayfiregrowthandinducesalargerfireheightthanthefollowingquasi-steadysprayfire.Thedeflagrationturnsstrongerwithincreasingtheinjectingpressure.

简介：Thepresentpaperinvestigatesthechaoticattitudedynamicsandreorientationmaneuverforcompletelyvis-cousliquid-filledspacecraftwithflexibleappendage.AlloftheequationsofmotionarederivedbyusingLagrangianmechanicsandthentransformedintoaformconsistingofanunperturbedpartplusperturbedtermssothatthesystem'snonlinearcharacteristicscanbeexploitedinphasespace.Emphasesarelaidonthechaoticattitudedynamicsproducedfromcertainsetsofphysicalparametervaluesofthespace-craftwhenenergydissipationactstoderivethebodyfromminortomajoraxisspin.Numericalsolutionsoftheseequa-tionsshowthattheattitudedynamicsofliquid-filledflexiblespacecraftpossessescharacteristicscommontorandom,non-periodicsolutionsandchaos,anditisdemonstratedthatthedesiredreorientationmaneuverisguaranteedbyusingapairofthrusterimpulses.Thecontrolstrategyforreorientationmaneuverisdesignedandthenumericalsimulationresultsarepresentedforboththeuncontrolledandcontrolledspinstransition.

简介：OnOctober15,2001,No.7generatingunitofYunnanXuanweiPowerGenerationCorp.5thphaseprojectwassuccessfullyputintooperationandconnectedtothepowernetwork.Hitherto,XuanweiPowerPlant5thphaseextensionprojectwaswhollycompleted.XuanweiPowerPlant5thphaseextensionprojectis

简介：为Agnanoparticles的准备的一条完全绿的小径被建议，由使用酱油蛋白质孤立(SPI)作为在紫外照耀和H2O下面的stabilizer作为在整个准备的环境地良性的溶剂。传播电子显微镜学(TEM)和希腊语的第六个字母潜力描述结果显示Agnanoparticles与一条平均直径稳定、很好分散大约13nm，和SPI/Ag合成nanoparticles的X光检查衍射(XRD)分析证实了金属性的银的形成。紫外力的光谱证明Agnanoparticles分散答案由于Agnanoparticles的表面电浆子回声在大约430nm有最大的吸收度。红外线的光谱学证实SPI的多肽脊梁没在变化形式过程期间被劈开并且一些积极的氨基的组被氧化。SPI/Ag合成nanoparticles对二个代表性的细菌举办优秀抗菌剂活动，葡萄球菌aureus(克积极)并且escherichiacoli(克否定)面对SPI。