学科分类
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500 个结果
  • 简介:Ji'aoGeophysicalExplorationCompanyofLiaohePetroleumAdministrativeBureausuccessfullyappliedahead-of-headVSPinterfacepredictionsintheMagu-2andMagu-3wellsinmidOctober.Thetwowellswerelocatedinthehigh,northtotheMagu-IwellintheMajuanziburiedhillbeltoftheLiaohewesterndepression.Seismicdatainthisareawaschaoticsothatdifficulttointerpret.Geologicalproblemsneededtobequicklyresolvedduringdrilling.

  • 标签: VSP界面预测 石油勘探 辽河 地球物理方法 地震波
  • 简介:Amodelwasestablishedtopredictcondensationheattransfercoefficientonhorizontalrectangularfinnedtube.Drop-Offzoneatthetubebottomwasconsideredanddetermined,theknownHonda(andOwen)expressionofretentionanglewasalsomodifiedasaresultofconsideringdrop-offzone.Heatfluxonfintipsintheunfloodedregion,finflanks,finspacingsandfintipsinthefloodedregionwereanalyzedrespectively.COndensationonfintipsinemphasizedbyconsideringthevariationoffilmthicknessalongcircumferenceaswellashorizontally.FInefficiencywasconsideredincalculation.Thepredictionresultswerecomparedwithseveralresearchers'experimentaldataforthreekindsofworkingfluidsonsevendifferenttubegeometriesandforvarioustemperaturedifferences,Thesedataunderabout60testconditionswerepredictedwithdiscrepancyof±10%.PredictionbythepresentmodelforsteamandR-113condensationwerecomparedwithpreviousmodels.

  • 标签: 冷凝器 单水平矩形散热管 设计模型
  • 简介:-Thispaper,afterbrieflyreviewingtheexperimentalresearchonsedimenttransportonmuddybeachsincethe1950s,improvesandperfectsthemethodforforecastingsiltationinnavigationchannelsandharbourbasinswhichwasfirstputforwardinChinabytheauthors.Inconsiderationofsiltysedimentandsand,somefactorsinforecastingmethodshavebeenchangedandmodified.Consequently,themodifiedmethodscanbeusedeithertocomputesiltationinnavigationchannelsandharbourbasinsonmuddybeachortocomputesiltationandscouringinnavigationchannelsandharbourbasinsonbothsiltybeachandsandybeach.Theverificationoffielddatafromelevenlarge,mediumandsmallnaturalharboursshowsagoodagreementbetweentheforecastingbythemodifiedmethodandthenaturalconditions.Finally,thepaperdealswiththerationalutilizationofwaterareaaftertheconstructionoftheWestDykeinLianyungang,themaintenanceofwaterdepthofthenavigationchannelattheentrance,siltationdistribution,siltationinthenavigationchannelandharbourbasinforshipsof100thousandtonnnage.ResultsonceagainprovethattheprospectofconstructingLianyungangHarbourintoadeepwaterharbourisbright.

  • 标签: navigation channel HARBOUR basin sediment concentration
  • 简介:Vacuumloadinghasbeenexaminedasawayofpreparinguniformlyconsolidatedsoftclaysamples.Thefacilityandloadingprocedurearedescribedinthispaper.Ananalyticalsolutiontothethreedimensionalconsolidationequationisderivedforestimatingthedegreeofconsolidationofthesoilsamplewithvacuumloading.Thegivenexampleshowsthatthepredicteddegreeofconsolidationofasoftclaybulkwithvacuumloadingisclosetothatmeasuredintheconsolidationprocess.

  • 标签: RECONSTITUTED CLAY VACUUM LOADING sample preparation
  • 简介:Intheestimationofseismictendency,usingGutenberg-Richter¢sb-valueandusingHurstexponentaretwocom-monlyusedmethods.Basedonthefractalgeometryofearthquaketimeseries,wepointoutthatthesetwomethodscorrelatetoeachother.IntheperspectiveoffractionalBrownianmotion(FBM),anearthquakesequencewithb>3/4andthatwithb<3/4havedifferentdynamicproperties.

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  • 简介:Thispaperdealswiththepredictionofpotentiallymaximummagnitudeandorigintimeforreservoirinducedseismicity(RIS).ThefactorandsignofseismologyandgeologyofRIShasbeenstudied,andtheinformationquantityformagnitudeofinducedseismicityprovidedbythemhasbeencalculated.Intermsofinformationquan-titythebiggestpossiblemagnitudeofRISisdetermined.Thechangesofseismicfrequencywithtimearestudiedusinggreymodelmethod,andthetimeofthebiggestchangerateistakenasoriginaltimeofthemainshock.ThefeasibilityofmethodsforpredictingmagnitudeandtimehasbeentestedforthereservoirinducedseismicityintheXinfengjiangreservoir,ChinaandtheKoynareservoir,India.

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  • 简介:Hydrodynamicandthermalcharacteristicsinapipewithsinusoidalwavysurfaceforsteadylaminarflowareinvestigatednumericallyinthepresentstudy.TheintegralformsofgoverningequationsarediscretizedusingcontrolvolumebasedFinitevolumemethodwithcollocatedvariablearrangement.SIMPLEalgorithmisusedandTDMAsolverisappliedforsolutionofsystemofequations.Apipeoflengthequalto4λisconsidered.Effectofsurfacewaviness,determinedbywavelength-amplituderatioλ/a(=L^*),onflowandthermalfieldispresented.ThesimulationworkhasbeencarriedoutforL^*=11.0-30.0foraReynoldsnumberrange50to2000.Resultsarepresentedintheformofstreamfunction,isothermallines,velocityandvorticityprofiles,changeofmeanfrictionfactor,variationinskinfriction,localandaverageNusseltnumberwithReynoldsnumber,wavenumber(n)andL^*.Foraparticulargeometry,lengthofcirculationzoneincreaseswithreynoldsnumberandapproachesalimitingvalueforhigherReynoldsnumber.Wallshearstressinthebulgepartofthechannelshowssmallervaluesthataffectlargely.therateofheattransferandNusseltnumbershowsminimumvaluesinthisregion.Thiscirculationzonedrasticallyincreaseswiththeincreaseofsurfacewavinessshowinghighmeanfrictionfactorperwavelength.MeanfrictionfactorinverselyvarieswithReynoldsnumber.Acorrelationisproposedforcalculatingfrictionfactorintheformf=C/(Re)^m,where‘C’and‘m’representstwopolynomialsofdegree4and2respectivelyandarefunctionofL^*.Higherwavinessofthesurfaceshowsthehigherheattransferratethanlowerwaviness.Heattransferratefallsalmostexponentiallyalongtheaxialdirectionwiththeincreaseofwavenumber.

  • 标签: 流体 波形管 热交换 特征
  • 简介:Theoscillationofmulti-timescalesandtheprocessoftransitionbetweencoldandwarmperiodsovermostpartsofChinaandits6regions(theNortheast,NorthChina,ChangjiangRiverValley,SouthChina,theSouthwest,theNorthwest)wereanalyzedwithwavelettransformationandbycomputingthevariancesofthewaveletcomponentsforthetemperaturegradeseriesduringJanuary191ItoFebruary2001,Thepredictionmodelforcoldandwarmperiodshasbeendevelopedandthetrendofcoldandwarmchangeinthecoming10yearsispredicted.Theresultsshowthattheoscillationwithperiodsofaround30-40yearswasthestrongestinthelast100yearsandthe3-yearoscillationinbothwinterandsummerwasalsostronger,especiallyinwinter.Thetransitiontimeofcoldandwarmperiodsintermsofwintermeandidnotcoincidewiththatofannualmean,butthedifferencebetweensummermeanandannualmeanisless.Theprocessesoftransitionof6regionsaresomewhatdifferent,theirmaincharacteristicsarethatthebeginningyearofsignificantwarmingfor1980sto1990swasverydifferentforthesouthernandthenorthernpartofChina.Itisfoundthatthestrongeroscillationwith3-yearperiodcausescoolinginNortheastChinainrecentseveralwinters.Theexperimentalpredictionsshowthatthemodelsusedinthepapercanprojectthemajortransitionbetweenhighandlowtemperatureperiods.

  • 标签: trend of coldness and warmness PROCESS
  • 简介:Anewmethodwasdescribedforusingarecurrentneuralnetworkwithbiasunitstopredictcontactmapsinproteins.Themaininputstotheneuralnetworkincluderesiduespairwise,residueclassificationaccordingtohydrophobicity,polar,acidic,basicandsecondarystructureinformationandresidueseparationbetweentworesidues.Inourwork,adatasetwasusedwhichwascomposedof53globulinproteinsofknown3Dstructure.Anaveragepredictiveaccuracyof0.29wasobtained.Ourresultsdemonstratetheviabilityoftheapproachforpredictingcontactmaps.

  • 标签: 循环神经网络 蛋白质 预测 血红素 三维结构
  • 简介:Thesystemofmineraldepositstatisticalpredictionmethods,basedonthesimilarity-analogytheory,searchinganomalytheoryandthetheoryofore-controllingbyquantitativeassemblageofmetallotects,canhesummarizedintothefollowingaspects:(1)concludingmainore-controllingconditionsandore-huntingindicatorsfromtypicaldeposits;(2)establishinggeologicalconceptmodelofdeposits;(3)selectinggeologicalvariableanddividingstudyunitsandgrantingspecificvalueforeachvariable;(4)bytheuseofgeologicalandmathematicalgeologymethod,buildingpredicationmodel,delineatingprospectiveareaforexplorationandestimatingthetotalresources;(5)evaluatingtheprospectingwork.ItisgoodpracticetousethissystemformetallogenicprognosisandregionalprospectingofgolddepositinEastJunggar,Xinjiangandhasachievedgreatsuccess.Asaresult,wediscoveredtheKubusugoldmineralizedbelt,delineatedprospectivearea,estimatedtotalresourcesofgoldinthebelta

  • 标签: gold DEPOSIT METALLOGENIC PROGNOSIS mathematical GEOLOGY
  • 简介:Thephenomenonofearingisinvestigatedinthepresentstudybasedonthetheoryofcrystalplasticitywiththedynamicexplicitfiniteelementprogramdeveloped.FirstlytextureanalysisiscarriedoutofrolledaluminiumalloyA15052bymeansofX-raytechnique.Thenfromthetexturecoefficientsananalyticalexpressionfortheorientationdistributionfunction(ODF)isderivedmakinguseofthecomputeralgebraiclanguageMathematica4.0,whichmakesiteasiertodiscretizetheODFintoaseriesofEuleriananglesrepresentingthedistributionoflatticesandfurtherthepreferredorientation(texture)ofcrystalsoftheoriginalsheets.Forthepolycrystalmodel,thematerialisdescribedusingcrystalplasticitywhereeachmaterialpointinthesheetisassumedtobeapolycrystallineaggregateofaverylargenumberofface-centeredcubic(FCC)grainswitheachgrainmodelledasanFCCcrystalwith12distinctslipsystems.ThemodifiedTaylortheoryofcrystalplasticityisusedandonlytheinitialtextureistakenintoconsiderationduringlargeplasticdeformation.Numericalsimulationofearinghasbeenperformedforanaluminiumsheetwithtextureandonewithcrystalsexhibitingrandomdistributiontodemonstratetheeffectoftextureofmaterialsontheirplasticanisotropyandformability.

  • 标签: EARING 质地 取向分发功能(ODF )
  • 简介:Toachievelowerassemblydelayatopticalburstswitchingedgenode,thispaperproposesanapproachcalledcurrentweightlengthprediction(CWLP)toimproveexistingestimatemechanisminburstassembly.isintroducedtomakeadynamictradeoffbetweenthecurrentandpasttrafficunderdifferentoffsettime.SimulationresultsshowthatCWLPcanachieveasignificantimprovementintermsoftrafficestimationinvariousoffsettimeandofferedload.

  • 标签: 光学脉冲开关 预报方法 电流估计 CWLP法 数字仿真
  • 简介:Thepotentialbasedlowordersurfacepanelmethodisusedtopredictthehydrodynamicperformanceofmarinepropellers.Inpresentmethodthehyperboloidalquadrilateralpanelsareemployedtoavoidthegapbetweenthepanels.TheinfluencecoefficientsofpanelsarecalculatedbyMorino’sanalyticalformulationsforincreasingnumericallycalculatingspeed.Thepres-sureKuttaconditionissatisfiedonthetrailingedgeofpropellerbladebyNewton-Raphsoniterativeprocedure.Thereforethe

  • 标签: PROPELLER POTENTIAL surface PANEL MET HOD
  • 简介:这研究为预言并且分类电压门离子通道描述方法。第一,一个标准支持向量机器(SVM)方法分别地为由使用氨基酸作文和dipeptide作文预言离子通道被开发,与82.89%和85.56%的精确性。当与希腊语的第二十三个字母强风类似搜索结合了时,这个SVM方法的精确性从85.56%~89.11%被改进。然后,我们为由使用dipeptide作文分类离子通道(钾,钠,钙,和氯化物)开发了一个SVM方法并且完成了96.89%的全面精确性。我们进一步由使用联合基于dipeptide的SVM的一个混合方法完成了97.78%的分类精确性并且隐藏Markov模型方法。网服务者VGIchan为预言上面来临并且分类电压门离子通道使用被开发了。VGIchan在www.imtech.res.in/raghava/vgichan/是自由地可得到的

  • 标签: 电压门控性离子通道 预测 分类 支持向量机 VGIchan服务器
  • 简介:Fieldmeasurementsofdrivingresistancesandheightsofsoilcoreduringdrivingweremadeoffshoreandonshoreofsteelpipepiles.Measureddatashowthattheheightofsoilcorevariesdifferentlyforpilesofdifferentdiameterswiththeincreaseofpenetration.Dynamicpluggingcouldbeassumednevertooccurforsteelpipepileswithdiametersover900mm.Soilresistancesatthetimeofcontinuousdriving(SRD)arebackanalyzedfromblowcountswithanempiricaldistributionofresistancessuppportedbymanyearlydynamicmeasurements.AmethodofpredictingSRDisfinallysuggested.

  • 标签: DRIVABILITY PREDICTION offshore PILE PILING SOIL
  • 简介:Forpredictionoftheextremesignificantwaveheightintheoceanareaswherelongtermwavedataarenotavailable,theempiricalmethodofextrapolatingshorttermdata(1~3years)isusedindesignpractice.Inthispapertwomethodsareproposedtopredictextremesignificantwaveheightbasedonshort-termdailymaxima.AccordingtothedaarecordedbytheOceanographicStationofLiaodongBayattheBohaiSea,itissupposedthatdailymaximumwaveheightsarestatisticallyindependent.Thedatashowthatdailymaximumwaveheightsobeylog-normaldistribution,andthatthenumbersofdailymaximavaryfromyeartoyear,obeyingbinomialdistribution.Basedonthesestatisticalcharacteristics,thebinomial-log-normalcompoundextremumdistributionisderivedforpredictionofextremesignificantwaveheights(50~100years).Forexaminationofitsaccuracyandvalidity,thepredictionofextremewaveheightsisbasedon12years′dataatthisstation,andbasedoneach3years′datarespectively.Theresultsshowthatwithconsiderationofconfidenceintervals,thepredictedwaveheightsbasedon3years′dataareveryclosetothosebasedon12years′data.TheobserveddatainsomeoceanareasintheAtlanticOceanandtheNorthSeashowitisnotcorrecttoassumethatdailymaximumwaveheightsarestatisticallyindependent;theyaresubjecttoMarkovchaincondition,obeyinglog-normaldistribution.Inthispaperananalyticalmethodisderivedtopredictextremewaveheightsinthesecases.AcomparisonofthecomputationsshowsthatthedifferencebetweentheextremewaveheightsbasedontheassumptionthatdailymaximaarestatisticallyindependentandthattheyaresubjecttoMarkovChainconditionissmallerthan10%.

  • 标签: DAILY MAXIMA COMPOUND extremum distribution MARKOV
  • 简介:第一条为统一全国年节及纪念目的假期,制定本办法。第二条全体公民放假的节日:(一)新年,放假1天(1月1日);(二)春节,放假3天(农历正月初一、初二、初三);(三)劳动节,放假3天(5月1日、2

  • 标签: 青年节 公民 国务院 劳动节 节日 全体
  • 简介:目的探讨p27^kipl、p53蛋白在胃癌的表达关系和预后意义。方法用免疫组化法同步检测20例胃良性病变标本及80例胃癌组织pZ7、p53的表达。结果80例胃癌p27蛋白阳性率为41,25%(33/80),低于胃良性病变标本100%(20/20),p53阳性率在胃癌为43.75%(35/80),而在胃良性病变标本为0。胃癌p27阳性组的p53阳性率为66.67%,显著高于p27阴性组(P<0.05),p27与p53呈正相关,p27与预后弱相关,p53与预后密切相关。结论p27、p53相互作用,对胃癌发生发展起重要作用;p27表达愈强,p53表达愈弱,说明预后较好,反之则差,联合检测pZ7、p53可辅助胃癌诊断,估计预后,选择治疗方案。

  • 标签: 胃癌 P53蛋白 P27^KIPL蛋白 基因表达 病理学