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6 个结果
  • 简介:Asisalreadyknown,mostoftheplasmaliteratureisoccupiedwiththeplasmainstabilitiesandtheinevitableplasmawaves,whichremainmajorobstaclestothethermonuclearfusionprocess.Manyexperimentaldataontheplasmawaves(growthordamping)andtheiraccompaniedtheoreticalinterpretationshavebeenpublishedduringthelastfivedecades;lotsofthemhavebeenidentifiedandjustifiedaswell,somenotyet.Oneoftheseisourpreviousresearchonplasmawaves,whichoriginatedintheearly80'satthePlasmaPhysicsLaboratoryoftheNCSR'Demokritos'.Asthewaverisingisdefinedbythegrowthrate(orthedampingontheextinguishment),theseimportantwavyquantitieswillbestudiedindetailinthepresentpaper.Threeexamplesaretakenfromourprevioustheoreticalresults,andthefirstobservationrevealsthattheinvolvedquantitiesarecomplicatedenoughtobestudiedbythemselves.So,theuseofsuitableapproachmodels,whichmayinterprettheexperimentalwavyquantities,isthecentralideaofthepresentattempt.Furthermore,calculationswithalittlechangeoftheinitialconditionshavebeenrepeatedinordertodeterminewhethertheplasmabehavesasachaoticmedium.

  • 标签: 数学模型 生长速率 阻尼率 近似解 等离子体波 实验数据
  • 简介:食道的癌症在中国展出最高的发生和死亡率之一。恶意的肿瘤由食道的癌症引起了,并且到环境因素的关系是许多公共健康研究的焦点。这研究使用了空间分析全国查明在水污染和食道的癌症死亡率之间的关系。我们采用了二数据集,包括质量在瓷器主要的河和湖里分级的率和分布,和公民浇的食道的癌症的国家调查。食道的癌症数据基于不同的水质量等级被组织,它从河和湖包括了放大缓冲区距离。非参量的关联分析被执行检验下列关联的存在或缺席:(i)来自河和湖的食道的癌症死亡和缓冲区距离;并且(ii)食道的癌症死亡和水质量分级价值。现在的学习全国揭示了在普遍的水污染和食道的癌症死亡之间的重要积极关联;并且在食道的癌症死亡之间的重要否定关联,和来自河和湖的缓冲区距离。

  • 标签: 缓冲距离 空间分析 死亡率 水污染 食道癌 相关分析
  • 简介:Inthispaper,weareconcernedwiththeglobalexistenceandconvergenceratesofthesmoothsolutionsforthecompressiblemagnetohydrodynamicequationswithoutheatconductivity,whichisahyperbolic-parabolicsystem.TheglobalsolutionsareobtainedbycombiningthelocalexistenceandaprioriestimatesifH3-normoftheinitialperturbationaroundaconstantstatesissmallenoughanditsL1-normisbounded.Aprioridecay-intimeestimatesonthepressure,velocityandmagneticfieldareusedtogettheuniformboundofentropy.Moreover,theoptimalconvergenceratesarealsoobtained.

  • 标签: 磁流体方程组 整体存在性 三维可压缩 收敛速度 热导率 光滑解
  • 简介:Inthispaper,usingthe1999~2007GPSvelocityfielddata,andbychoosingtheoptimalblockmodel,weobtainedthedeformationmodelsapplicabletotheboundaryzonesofmajorblocksandtheslipratesofblockboundaryfaultsonthemid-southernsegmentoftheNorth-SouthSeismicBelt.Theresultsshowthat:ontheLongmenshanfaultzone,thetensionalandcompressivesliprateissmallontheBaoxing-Wenchuansegment,about0.5~1.8mm·a-1,andtherateisrelativelysignificantonthesegmentoftheWenchuan-Maoxian,as1.8~3.8mm·a-1;ontheXianshuihefaultbelt,thereisacertaindifferenceinspatialdistributionbetweenthetensionalsliprateandstrike-sliprate:thetensionalsliprate(8.1mm·a-1)isbiggerthanthesinistralstrike-sliprate(4.8mm·a-1)atthenorthoftheLuhuoregion;thetensionandcompressionsliprateisbasicallythesameasthestrike-sliprateatLuhuo-Dawu;theDawu-Kangdingsectionpresentsatrendofdecreasedstrike-sliprateandincreasedtensionalsliprate;theKangding-Shimiansegmentshowsastrike-slipnature;thestrike-sliprateissignificantlygreaterthanthetension/compressionrateontheXiaojiangfaultzone;thesliprateontheRedRiverfaultzoneshowsobviousspatialsegmentation,thesliprateissmallerinitsnorthwestpart,butwithacertainamountoftensional/compressioncomponent,4.7mm·a-1ontheJingdongsegment.ThesegmenteastofJingdong(westernGejiu)ismainlyofstrike-slip,withasliprateof4.5mm·a-1.

  • 标签: 断裂滑动速率 南北地震带 块体理论 左旋走滑速率 GPS速度场 计算
  • 简介:Inthispaper,stochasticglobalexponentialstabilitycriteriafordelayedimpulsiveMarkovianjumpingreaction-diffusionCohen-Grossbergneuralnetworks(CGNNsforshort)areobtainedbyusinganovelLyapunov-Krasovskiifunctionalapproach,linearmatrixinequalities(LMIsforshort)technique,It?formula,Poincar′einequalityandHardy-Poincaréinequality,wheretheCGNNsinvolveuncertainparameters,partiallyunknownMarkoviantransitionrates,andevennonlinearp-Laplacediffusion(p>1).ItisworthmentioningthatellipsoiddomainsinRm(m≥3)canbeconsideredinnumericalsimulationsforthefirsttimeowingtothesyntheticapplicationsofPoincar′einequalityandHardy-Poincar′einequality.Moreover,thesimulationnumericalresultsshowthateventhecorollariesoftheobtainedresultsaremorefeasibleandeffectivethanthemainresultsofsomerecentrelatedliteraturesinviewofsignificantimprovementintheallowableupperboundsofdelays.

  • 标签: POINCARE不等式 全局指数稳定性 反应扩散 神经网络 非线性 时滞相关