简介：Thelarge-diametercylinderstructure,whichismadeoflargesuccessivebottomlesscylindersplacedonfoundationbedorpartlydrivenintosoil,isarecentlydevelopedretainingstructureinChina.Itcanbeusedinport,coastalandoff-shoreworks.Themethodforstabilityanalysisofthelarge-diametercylinderstructure,especiallyforstabilityanalysisoftheembeddedlarge-diametercylinderstructure,isanimportantissue.Inthispaper,anideaispresentedthatis,em-beddedlarge-diametercylinderquayscanbedividedintotwotypes,i.e.thegravitywalltypeandthecylinderpilewalltype.Amethodforstabilityanalysisofthelarge-diametercylinderquayofthecylinderpilewalltypeisdevelopedandamethodforstabilityanalysisofthelarge-diametercylinderquayofthegravitywalltypeisalsoproposed.Theeffectofsig-nificantparametersonthestabilityofthelarge-dianetercylinderquayofthecylinderpilewalltypeisinvestigatedthroughnumericalcalculation.

简介：AmethodofcoupledBEM-FEManalysisfortheelasticspatialstructuresystemispresented.Itcanbeappliedtothecalculationofthestressanddeformationofthelarge-diamatercylinderstructuresystemanditissuitableforsymmetricornon-symmetricstructuresunderthedistributedorconcentratedload.NumericalexamplesshowthattheproposedmethodandcomputerprogramBEFEMarequiteefficientintheanalysisofthelarge-diametercylinderstructureproblemsinoceanengineering.

简介：Physicalmodeltestswerecounductedtopredictlocalscourandmaximumscourdeptharoundthelargediametercylinderslocatedinthe(sand)seabedundertheactionofbothwaveandcurrent.Accordingtotheresultoftests,ananalysiswasmadeonallthefactorsinfluencingthescour.Theresultsshowsthatfortheseabedwithrelativefinegrainsinshallowwater(0.07＜h/L≤0.28),whentherelativediameterD/Lofthecylinderiswithin0.3-0.7,themaineffectivescourfactorsaroundthecylinderintheseabedarediameterDofthecylinder,thewaveheightH,thewavelengthL,thevelocityVcofthecurrentandtheparametersrelatedtotheseabedsoiltexture.Themainparametersinfluecingthemaximumscourdepthwereanalyzed,andthetestdataweresyntherized,toobtaintheformulapredictingthescourdeptharoundthelargediametercylinderundertheofbothwaveandcurrent.

简介：Thepropagationofstresswavesinalarge-diameterpipepileforlowstraindynamictestingcannotbeexplainedproperlybytraditional1Dwavetheories.Anewcomputationalmodelisestablishedtoobtainawaveequationthatcandescribethedynamicresponseofalarge-diameterthin-walledpipepiletoatransientpointloadduringalowstrainintegritytest.Ananalyticalsolutioninthetimedomainisdeducedusingtheseparationofvariablesandvariationofconstantmethods.Thevalidityofthisnewsolutionisverifiedbyanexistinganalyticalsolutionunderfreeboundaryconditions.Theresultsofthistimedomainsolutionarealsocomparedwiththeresultsofafrequencydomainsolutionandfieldtestdata.Thecomparisonsindicatethatthenewsolutionagreeswellwiththeresultsofprevioussolutions.Parametricstudiesusingthenewsolutionwithreferencetoacasestudyarealsocarriedout.Theresultsshowthatthemodenumberaffectstheaccuracyofthedynamicresponse.Amodenumbergreaterthan10isrequiredtoenablethecalculateddynamicresponsestobeindependentofthemodenumber.Thedynamicresponseisalsogreatlyaffectedbysoilproperties.Thelargerthesideresistance,thesmallerthedisplacementresponseandthesmallerthereflectedvelocitywavecrest.Thedisplacementincreasesasthestresswavespropagatealongthepilewhenthepileshaftisfree.Theincidentwavesofdisplacementandvelocityresponsesofthepilearenotthesameamongdifferentpointsinthecircumferentialdirectiononthepiletop.However,thearrivaltimeandpeakvalueofthepiletipreflectedwavesarealmostthesameamongdifferentpointsonthepiletop.

简介：Manualmonitoringandseamtrackingthroughwatchingweldpoolimagesinreal-time,bynakedeyesorbyindustrialTV,areexperience-depended,subjective,laborintensive,andsometimesbiased.Soitisnecessarytorealizetheautomationofcomputer-aidedseamtracking.APAW(plasmaarcwelding)seamtrackingsystemwasdeveloped,whichsensesthemoltenpoolandtheseaminoneframebyavisionsensor,andthendetectstheseamdeviationtoadjusttheworkpiecemotionadaptivelytotheseampositionsensedbyvisionsensor.Anovelmoltenpoolareaimage-processingalgorithmbasedonmachinevisionwasproposed.Thealgorithmprocesseseachimageatthespeedof20frames/secondinreal-timetoextractthreefeaturevariablestogettheseamdeviation.Itisprovedexperimentallythatthealgorithmisveryfastandeffective.Issuesrelatedtothealgorithmarealsodiscussed.

简介：在钨卤素灯的安排和晶片收到的发光的一致性之间的关系被讨论，并且一种axial-symmetricallamps-array被设计保证边上的照耀是近似一样的著名计算机生产厂商他晶片的中心上的。晶片对力量oftungsten卤素灯上的温度的大小数字地被计算。

简介：High-strengthpipelinesteelandlargediameterlinepipesareoftenusedtoincreasethecapacityoftransportationandreducethecostassociatedwiththeconstructionandoperationoflong-distancegaspipelineprojects.China’sinitiativestoconstructlong-distancenaturalgaspipelineshasbroughtinnewopportunitiesforthedevelopmentofX80linepipes.BaosteelhasdesignedtheoptimumchemicalcompositionofX80withhighniobiumandlowmolybdenumcontent.Inaddition,aweldingexperimentalplatformandafiniteelementmodel(FEM)havesupportedthedevelopmentofX80UOEpipesinanefficientandeconomicalway.TheapplicationandrecentdevelopmentofX80UOEpipeswereintroducedinthispaper.TocomplywiththerequirementsoftheSecondWest-EastGasPipelineProject(2ndWEPP),X80pipelinesteelwithlowcarbonbainitemicrostructurewasdevelopedbyutilizingtheoptimizedcompositionandTMCPprocess.Thematchingweldingmaterial,weldingprocedureandUOEformingprocessesfor1219mmoutsidediameterX80UOEpipeswerealsodeveloped.Morethan340000tofX80UOEpipeswereproducedandappliedinthe2ndWEPP.Furthermore,tomeettheprospectivedemandforlong-distancegaspipelineswithanannualtransportationcapacityofover40billionm3,largersizeX80UOEpipeswith1422mmOD×30.8mmWTweretrialproducedrecently.DWTTperformance,themaintechnicalchallengeforheavierwallpipes,wasimprovedbyusingoptimizedmicrostructuraldesign.ThenewlydevelopedX80pipescanbepotentiallyusedforlargertransportationcapacitypipelinesinChina.

简介：数字分析和模拟是一个有效工具开发先进生长技术并且为300公里并且在以外的硅晶体控制缺点类型，尺寸和密度。在现在的纸，在Czochralski(CZ)水晶生长配置的melt流动的数字分析，三维(3D)建模，模拟在磁场，当模特儿的逆和时间依赖者模拟下面融化流动被考察。最后，有试验性的大小的数字分析的比较被讨论。

简介：扩大堆积柄在一个稠密的沙的地点上成立了的一条大直径的地震行为在这份报纸被调查。首先，确定的分析包括非线性的动态分析(NDA)和闲差事分析被进行获得卓见进堆积的行为并且保证一种适当建模技术被利用。然后，概率的分析用各种各样的要求的NDA的结果被执行。到这个目的，一套40个像脉搏的地面运动被拣并且随后40非线性动态并且闲差事分析被执行。从NDA获得的数据被用来产生概率的地震需求模型(PSDM)阴谋并且因而，为每个阴谋的中部的行和分散被计算。NDA和闲差事数据也对对方被阴谋发现到到什么程度，他们被相关。这些操作为各种各样的工程需求参数(电子数据处理)被做。敏感分析被做拣将从7不同IM在PSDM阴谋引起最小的分散的最适当的紧张措施(IM)。山峰地面加速(针网阵列)被发现是最适当的IM。能被用于闲差事分析数据关于NDA产出更好的结果的针网阵列的一个函数被建议的闲差事系数方程。在结束，和平的地震工程研究(同伴)中心方法论被利用用从PSDM阴谋并且就损坏从未成年者到的各种各样的状态而言获得的性质产生脆弱曲线严重。扩大堆积柄与严重损坏相比关于次要的损坏与更高的可能性显示出更多的危险。

简介：BaoshanIron&SteelCo.,Ltd.,(referredtoasBaosteel)inChinafirstsucceededindevelopingtheU-ing-O-ing-Expanding(UOE)longitudinalsubmergedarcweldedpipes(SAWLs)offshorelinepipeofamaximumthickness/outsidediameter(T/D)0.042in2011.DescribedinthispaperistheresearchanddevelopmentoftheX70UOESAWLpipesbythecompany.TheresultshowsthatthesaidX70linepipehasbeenincompliancewithrelevantrequirementsasspecifiedinSpecificationsDNV-OS-F101,andhasbeensuccessfullyusedintheSouthChinaSeadeepwatergaspipelineproject.

简介：Thispaperreportstheexperimentsofevaporationstudyin6mminnercopperdiametertubesusingHFC-134a,HCFC-22andCFC-12asworkingfluid.Theresultsshowthattheevaporationheattransfercofeeicientincreasesewiththedecreasingofinnerdiameteroftubes,AnewconceptofnondimensionaltubediameterUisproposedinthispaperforcorrectionoftheinfluenceofthetubediameterontheevaporationheattransfercoefficient.Andfurther,aconveinentempiricalcorrectionmethodispreseted.

简介：摘 要：滑模在水电站竖井衬砌施工中应用普遍，具有成本低、效率高的特点。常规滑模施工只有一个井口，滑模受力情况较简单。乌东德出线竖井由电梯井、电缆竖井、通风竖井、母线竖井，以及过道、前厅等组成，局部结构空间狭小，单层预埋件设施及门窗孔洞多，结构极其复杂，其中第一段高程987.00m～854.08m，竖井高度132.92m；第二段高程1144.70m～987.00m，竖井高度157.7m。滑模施工具有高差大、小井多且不均匀布置、井间作业空间狭小、竖井型体精度要求高等特点。本文针对以上特点，重点研究在复杂断面不均匀受力条件下的滑模设计和纠偏措施，并成功应用于乌东德地下电站出线竖井，进度、质量均满足要求，可为类似项目提供借鉴和参考。

简介：Thispaperstudiesrestrictedfaultdiameterofthen-dimensionalhypercubenetworksQn(n≥2).ItisshownthatforarbitrarytwoverticesxandywiththedistancedinQnandanysetFwithatmost2n-3verticesinQn-{x,y},ifFcontainsneitherofneighbor-setsofxandyinQn,thenthedistancebetweenxandyinQn-FisgivenbyD(Qn-F；x,y){=1,for=1；≤d+4,for2≤d≤n-2,n≥4；≤n+1,ford=n-1,n≥3；=n,ford=n.Furthermore,theupperboundsaretight.Asanimmediatelyconsequence,Qncantolerateupto2n-3verticesfailuresandremaindiameter4ifn=3andn+2ifn≥4providedthatforeachvertexxinQn,alltheneighborsofxdonotfailatthesametime.ThisimprovesEsfahanian'sresult.

简介：让F是有|F的一块地|≥3，李·平·胡昂电子邮件：lipingmath@sohu.com全文预览(小，大)[3]。苍白，Z.X.：重游的矩阵的几何学，代数学和组合数学，一个国际国会，ICAC'97，香港，由K.P编辑了。Shum等，Springer-Verlag，新加坡，1999，477486[4]。黄，L.P.：在任何部门上的hermitian矩阵的毗邻保存bijection地图与复杂物响。ActaMathematicaSinica，英语系列，23(1)，95102(2007)[5]。黄，W.L.，Höfer，R.，苍白，Z.X.：毗邻保存地图砰对称并且hermitian矩阵。Aequations数学，67(12)，132139(2004)[6]。黄，W.L.，苍白，Z.X.：矩形的矩阵的毗邻保存地图砰。Beiträgezur代数学undGeometrie，45(2)，435446(2004)[7]。黄，L.P.：在戒指上的矩阵的几何学，科学出版社，北京，2006[8]。Šemrl，P.：在Hua矩形的矩阵的几何学的基本定理上。J。代数学，248，366380(2002)[9]。Cao，C.G.，黄，L.P.，唐，X.M.：保存在交替的矩阵上的等级2的添加剂地图。Afr。向国外散居J。数学，3(2)，107113(2005)[10]。你，H.，唐，X.M.：在对称、交替的矩阵的空格的等级添加的添加剂preservers。线性代数学Appl，380，185198(2004)[11]。张，X.：在在域和应用程序上的交替的矩阵空格的等级的添加剂preservers。线性代数学Appl，397(1)，325343(2005)[12]。张，X.：在在地上的交替的矩阵的空格的等级2的Linear/additivepreservers。线性代数学Appl，396(1)，91102(2005)[13]。Havlicek，H.，Šemrl，P.：从几何学到invertibilitypreservers。Studia数学，174，99109(2006)

简介：AsubsetofSofthevertexsetofagraphGiscalledacyclicifthesubgraphitinducesinGcontainsnocycles.SiscalledanacyclicdominatingsetofGifitisbothacyclicanddominating.Theminimumcardinalityofanacyclicdominatingset,denotedbyγα(G),iscalledtheacyclicdominationnumberofG.S.M.Hedetniemietal.on2000introducedtheconceptofacyclicdominationandposedthefollowingopenproblem:Isγα(G)≤δ(G)foranygraphwhosediameteristwo?Inthispaper,wegiveacounterexamplewhichdisprovestheproblem.

简介：在现在的纸，有直径二一reclassified的常规平面图。

简介：在这个工作，我们以它的最小的度和它的顺序为任何图的直径获得好上面的界限，改进由于Erd的一条古典定理?s，Pach，绿鳕和Tuza。我们使用这些界限以便学习夸张的图(在Gromov意义)。计算hyperbolicity常数是一个几乎难处理的问题，这样试着以图的一些参数围住它是自然的。让H(n，0)是有n顶点和最小的度0,和J的图G的集合(n，)是有n顶点和最大的度的图G的集合。我们在图上学习四个后面的extremal问题：一(n，0)=min{(G)|GH(n，0)},b(n，0)=最大{(G)|GH(n，0)},(n，)=min{(G)|GJ(n，)}并且(n，)=最大{(G)|GJ(n,)}。特别地，我们为b获得界限(n，0)和我们计算精确价值一(n，0),(n，，并且()，并且(n，)为n的所有价值，0并且分别地。

简介：

简介：4G、VoLTE以及后续融合通信等业务的出现，对Diameter信令网提出更高的要求。为满足信令转接需求，省内引入多对LDRA。多LDRA组网应划分信令汇接区，要求核心网网元按照LDRA分区方式进行分区，各网元Pool覆盖区域应小于LDRA信令汇接区，避免跨信令汇接区组Pool造成的信令迂回。

简介：ThisLetterproposesabrand-newfilamentdiametermeasurementmethodbasedonwhatiscalled'dualdiffraction,'inthatagratingisaddedbehindthefilamenttomakefulluseofitssubdivisionandamplificationcharacteristics.Highermeasurementaccuracyisachievedbythismethodcomparedwiththetraditionaldiffractionmethod.Toverifyitsaccuracy,threestandardfilamentswithnominalvaluesof100.2,120.1,and140.8μmaremeasuredbythedualdiffractionmethodandtraditionaldiffractionmethodunderthesameexperimentalconditions.Therelativemeasurementerrorsofthenewmethodarelessthan0.75%,anditsaveragerelativeerrorisreducedby56%comparedwiththetraditionaldiffractionmethod.