简介:摘要:L245/316L双金属复合管作为应用较为广泛的一种复合管材料在克拉玛依油田、塔里木油田等大型项目建设中均有使用。L245/316L双金属复合管采用热变型成型工艺,力学性能及耐腐蚀性能优异,但还需热处理消除其内应力,改善组织状态,使性能充分发挥出来。热处理能改善双金属复合管的耐腐蚀性能,找出适合的热处理参数及方法,可以生产出高质量的双金属复合管;对双金属复合管耐蚀情况研究也可为在复杂苛刻工况下的双金属管线钢提供理论依据。鉴于双金属复合管在国内油气集输管道的使用时间还不长,尚未有足够的对双金属复合管在热处理方面的研究与结论,对双金属复合管耐蚀情况的研究有限,所以对双金属管线钢在热处理下的力学性能变化及耐蚀情况研究有重要意义,以期能对生产提供指导。
简介:Permittivityofaseafoamlayerisveryimportantininvestigatingoceanbrightnesstemperaturemodel.Atmicrowavefrequency,theRayleighmethodisdevelopedtoestimatetheeffectivepermittivityoftheseafoamlayer.TosimplifythetediouscalculationofseafoameffectivepermittivityatLband(1.4GHz),Pade’approximationisadoptedtofittheseafoameffectivepermittivitycomputedbytheRayleighmethod.Withthisfittingformula,anewbrightnesstemperaturemodelofseafoamlayerdefinedbycertaingeophysicalparameters,suchasairvolumefraction(AVF),seasurfacetemperature(SST),seasurfacesalinity(SSS)andthicknessoffoamlayerd,isgiven.Furthermore,thesensitivitiesofthebrightnesstemperaturemodeltoSST,SSS,dandAVFofaseafoamlayeratLbandarediscussed.Thesensitivitiesarerankedfrommosttoleastintheorder:(1)d;(2)AVF;(3)SSS;(4)SST.ThisresultindicatesthatthemeasurementerrorsofdandAVFhavesignificantimpactsontheretrievalsofSSSandSST.Withtheexperimentalbrightnesstemperaturedata,theSSSandAFVareretrievedbycostfunction.
简介:MultiplicationofElaeagnusangustifoliaL.wasexaminedinvitrosuccessivelyfromasingleshootunderthespecifiedconditionofdifferentmedia,plantgrowthregulators,pHvalueandsucroseconcentration.ItwasshowedthatMMS1wasthemostsuitablemediumonshootmultiplicationamong5mediaconcerned;BAPwasthemosteffectiveoneamongallthecytokinininvolved,BAP,KN,TDZandZT;theexpluntofthetophalf-partfromashootproducedmorenewshootsthanthatofthefoothalf-partdid;morenewshoots(>2cm)wereproducedunder3%sucrosebetweentheconcentrationswithtophalf-partexplants;shootscouldgrowwellbetweenpH4.4andpH7.0,andthebiggestnumberofshootswasproducedinpH5.6,whileinpH5.8themaximumrootingrateappeared.Asaresult,thecombinationof0.5μMBAPand0.1μMIBAonMMS1mediuminducedthemaximumshootmultiplication.Thenumberofshootamplified3timesin1month,and3^12shoots(>2cm)mightbetheoreticallymultipliedannuallyfromasingleshoot.
简介:Inthisarticle,weshowthatifXisanexcellentsurfacewithrationalsingularities,theconstantsheafQeisadualizingcomplex.IncoefficientZe,wealsoprovethattheobstructionforZetobecomeadualizingcomplex,liesonthedivisorclassgroupsatsingularpoints.Asapplications,westudytheperversesheavesandtheweightsof-adiccohomologygroupsonsuchsurfaces.
简介:SomeKKMtheoremsandcoincidencetheoremsinvolvingadmissibleset-valuedmappingsandtheset-valuedmappingswithcompactlylocalintersectionpropertyareprovedinL-convexspaces.Asapplications,somenewfixedpointtheoremsareobtainedinL-convexspaces.Thesetheoremsimproveandgeneralizemanyimportantknownresultsinrecentliterature.
简介:让L是L上的一个分析的半组的无穷小的发电机[2]([n])与它的热核上的合适的上面的界限。假设L有围住的holomorphicL上的功能的演算[2]([n])。在这篇论文,我们定义与L联系在上的Littlewood-Paleyg功能[n]×[n],由GL(f)表示了(x1,x2),;定义区域功能,由SL(f)表示了(x1,x2)。用考尔德ón-Zygmund分解的一个珍视向量的版本,我们为1