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  • 简介:Thispaperusingfinitedifferenceschemeforthenumericalsolutionofadvection-dispersionequationdevelopsaone-dimensionalwaterqualitymodel.ThemodelalgorithmhassomemodificationoverothersteadystatemodelsincludingQUAL2E,whichhavebeenusedsteadystateimplementationofimplicitbackward-differencenumericalscheme.Thecomputerprograminthedevelopedmodelcontainsaspecialunsteadystateimplementationoffourpointimplicitupwindnumericalschemesusingdoublesweepmethod.Thesuperiorityofthismethodinthemodelingprocedureresultsthesimulationefficacyundersimplifiedconditionsofeffluentdischargefrompointandnon-pointsources.Themodelishelpfulforeyeviewassessmentofdegreeofinteractionbetweenmodelvariablesforstrategicplanningpurposes.ThemodelhasbeenappliedforthewaterqualitysimulationoftheHanjiangRiverbasinusingflowcomputationmodel.Modelsimulationresultshaveshownthepollutantsprediction,dispersionandimpactontheexistingwaterquality.Modeltestshowsthemodelvaliditycomparingwithothersophisticatedmodels.Sensitivityanalysiswasperformedtooverviewthemostsensitiveparametersfollowedbycalibrationandverificationprocess.

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  • 简介:ThispaperisconcernedwithnumericalmethodsforAmericanoptionpricing.Weemploynumericalanalysisandthenotionofviscositysolutiontoshowuniformconvergenceoftheexplicitdifferenceschemeandthebinomialtreemethod.Wealsoprovetheexistenceandconvergenceoftheoptimalexerciseboundariesintheaboveapproximn.tions.

  • 标签: 收敛 微分 二项式 数字分析 概率论
  • 简介:Inthispaper,byusingthecriticalpointtheory,theexistenceofperiodicandsubharmonicsolutionstoaclassofsecondorderfunctionaldifferenceequationsisobtained.ThemainapproachusedinourpaperisvariationaltechniqueandtheSaddlePointTheorem.Theproblemistosolvetheexistenceofperiodicandsubharmonicsolutionsofsecondorderforwardandbackwarddifferenceequations.

  • 标签: 二阶差分方程 解的存在性 周期解 调和 临界点理论 鞍点定理
  • 简介:Staphylococcusepidermidisisoneoftheleadingpathogensofnosocomialinfections.Twenty-eightstrainsofbiofilm-negativeStaphylococcusepidermidis,ofwhichthirteenstrainsconsideredastheclinicalstrainswereisolatedfromcatheters,bloodandurineofpatientsinHuashanHospital(Shang-hai,China)andfifteenstrainsconsideredascommensalstrainswereisolatedfromtheskinofhealthystudentswhohadnocontactwithhospitalsinrecenthalfyear,wereinvestigatedfortheadherencetohumanumbilicalveinendothelialcelllineECV304andhumancervicaladenocareinomacelllineHela,respectively.Ourresultsshowedthattheclinicalstrainsweremuchmoreadhesivetobothcellsthancommensalones.Theendothelialadherencemaybeavirulencefactorassociatedwiththisbacterialpathogenesis.

  • 标签: 葡萄球菌 临床医学 共生细菌 疾病
  • 简介:这份报纸在稻田在Fuzhou区域印射上介绍ENVISATASAR数据申请,用在2005获得的多时间的ASAR双极化数据。为这里处理的ASAR数据的过程为反散射从振幅包括数据刻度,图象登记,点缀减小和数据格式的变换到dB。米饭的反散射与种阶段的米饭增加,它与另外的陆地封面不同。基于图象差别技术,6个计划与ASAR被设计不同时间并且为稻田印射的极化数据。在在米饭庄稼的早时期和成长或成熟的时期的图象之间的差别图象,比在在一样的日期的不同极化之间的那些差别图象对米饭抽取更合适。最精确的结果近来,米饭抽取基于在10月和8月获得的HH极化数据的差别被完成。因此为稻田印射,时间的信息比极化信息更重要。数据为印射的高精确性米饭在米饭的早成长的季节期间是很重要的。

  • 标签: ENVISAT ASAR 米饭庄稼印射 图象差别 Fuzhou
  • 简介:Thispapergivesamethodofquantifyingsmallvisualdifferencesbetween3Dmeshmodelswithconformingtopology,basedonthetheoryofstrainfields.Strainfieldisageometricquantityinelasticitywhichisusedtodescribethedeformationofelastomer.Inthispaperweconsiderthe3Dmodelsasobjectswithelasticity.Thefurtherdemonstrationsareprovided:thefirstisintendedtogivethereaderavisualimpressionofhowourmeasureworksinpractice;andthesecondistogivereadersavisualimpressionofhowourmeasureworksinevaluatingfilteralgorithms.Ourexperimentsshowthatourdifferenceestimatesarewellcorrelatedwithhumanperceptionofdifferences.Thisworkhasapplicationsintheevaluationof3Dmeshwatermarking,3Dmeshcompressionreconstruction,and3Dmeshfiltering.

  • 标签: 三维网眼模型 视觉差别 网眼比较 感知 疲劳领域
  • 简介:Onlyinthepresenceofsidelobejamming(SLJ),cantheconventionaladaptivemonopulsetechniquenullthejammingeffectivelyandmaintainthemonopulseangleestimationaccuracysimultaneously.Whilemainlobejamming(MLJ)exists,themainlobeofadaptivepatternwillsubjecttoseriousdistortion,whichresultsinafailureofdetectingandtrackingtargetsbymonopulsetechnique.Therefore,amonopulseangleestimationalgorithmbasedoncombiningsum-differencebeamandauxiliarybeamispresented.Thisalgorithmutilizesbothhighgaindifferencebeamsandhighgainauxiliarybeamsforcancellingthemainlobejammerandmultiplesidelobejammers(SLJs)whilekeepinganadaptivemonopulseratio.TheoreticalanalysisandsimulationresultsindicatethattheseriousinvalidationofmonopulsetechniqueinMLJandSLJsscenariosisresolvedwell,whichimprovesthemonopulseangleaccuracygreatly.Furthermore,theproposedalgorithmisofsimpleimplementationandlowcomputationalcomplexity.

  • 标签: 自适应模式 脉冲干扰 光束 单脉冲技术 主瓣干扰 估计算法
  • 简介:在沉积运输的调查,区分休息(AoR)的角度的各种各样的定义是必要的在文学可得到。静态的AoR,斜坡的上面、更低的角度镇静,就在斜坡不稳定性前后的形式,当当沉积谷物连续地是动人的时,动态AoR能被观察时,击倒一个斜面。在现在的学习,一系列实验室实验被进行与0.28-4.38的中部的直径为一致自然沉积测量休息的静态、动态的角度?公里。结果证明不同斜坡角度有不同特征。上面、动态的AoR稍微与增加谷物直径增加,当更低的AoR不对在沉积的变化敏感时,缩放并且可以假定经常的价值。上面、更低的AoR的一般水准等价于动态AoR,并且他们之间的差别与增加谷物直径增加。当在运输,沙丘移植和本地人搜索的水流带来的碎石的调查使用开发时,现在的学习建议休息的不同角度应该小心地被对待。

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  • 简介:<正>ThenorthChinablockisborderedonthenorthbytheYinShan,onthewestbytheHelanShan,onthesouthbytheQinLing-DabieShan,andtotheeastbythesea.ThesouthChinablockisborderedonthenorthbytheDabaShan(QinLing)-DabieShah,onthewestbytheLongmenShan-DaliangShan,onthesouthwestbythegreatfaultalongtheRedRiver,andtotheeastandsoutheastbythesea.Thetopographyofthenorthissimpleandeven,likeatwo-stagedterracehigherinthewest.Thoughthatofthesouthisalsohigherinthewest,itisveryunevenwithaboundantlowerandmiddlemountainsandhills.TheQinLing-DabieShanisanarrowbeltwiththe

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  • 简介:在这篇文章,为第二份订单的内部层非线性的不可思议地使不安的微分差别的方程被考虑。用边界功能和部分步的方法,我们构造asymptotic扩大的公式并且指出在0有的t=的边界层在在t=的内部层之上的大影响。根据微分不平等技术,同时,光滑的答案的存在和asymptotic扩大的一致有效性被证明。最后,一个例子被给表明我们的结果的有效性。这篇文章的结果是新的,它补充以前已知的。

  • 标签: 微分差分方程 二阶非线性 内层 奇摄动 渐近展开 微分不等式
  • 简介:Abstract:Changesinthemillingquality,chemicalcharacteristics,eatingqualityanddynamicviscoelasticitiesofsevencultivarsofjapoinicariceafterabouteightmonthsstorageatroomtemperaturewerestudied.Comparisonsbetweennewandstoredricesshowedthatnoobviouschangesinmillingquality,amyloseandproteincontentwerefound.Thoughtherewasvarietaldifference,thepalatabilityofallcultivarsdeterioratedwithstorage.TheoveralleatingqualityofKoshihikariandEtsunan162storedricewerealmostthesameasthatofnewriceofNihonbareandXiushui11.Thedeteriorationinpalatabilitywasduetothedeteriorationoftheappearance,tasteandstickinessofcookedrice.Newricegrainfromcultivarswithagoodeatingqualityshowedarelativelyhighpalatabilityascomparewithstoredrice.Themoduliofcookedricegrainsofstoredricewereincreasedandvaluesoflosstangentofcookedricewaslowerthanthoseofnewrice,suchcasesinpoorpalatabilitycultivarsweremuchmoreobvious.Theeatingqualityofstoredricewasgenerallypoorforthecultivarswithahighfreefattyacidcontent.Inaddition,thebreakdownandmaximumviscosityvaluesinamylographiccharacteristicswereslightlyincreased.

  • 标签: 水稻 粘质 质量管理 脂肪酸
  • 简介:从长江盆的沉积分泌物在最近的年里有一个逐步的减少趋势。扣押三座峡水库加重了这个减少的趋势并且通过传播效果在长江河口影响了推迟的沉积集中(SSC)的变化。长江河口的SSC数据在19592012期间显示出那:(1)在南方的SSC在河口并且在长江分叉近海海区域显示了减少的趋势并且向海少些减少了。同时,在在SSC和沉积分泌物之间的减少的大小的差别向海变得更大。(2)为北方布朗奇,优先的流动没很变化,但是SSC趋于减少,它被SSC的减少主要在南方布朗奇和中国东方海引起。(3)由于减少的流量和相对加强的潮,在在20032012的浅节移动了的酒吧中的SSC的山峰区域为在19842002与那相比联合起来的大约1/6经度里面,并且里面动人的距离在洪水季节的顺序>年度一般水准>旱季。(4)在南方经过的入口,因为增加由暂停引起了,岸沟交换是,SSC主要减少了不到减少在盆和海区域由锋利的SSC减少引起了。颠倒在中间的节是真的,在SSC显示出一个增加的趋势的地方。(5)在北方经过的入口在减少的流动裂口和沉积裂口比率的联合影响下面,在盆和海区域和暂停的减少的数量的减少的SSC,SSC显示了一个减少的趋势。在中间的节,因为增加的数量由沉积引起了,温习塘是多于减少的数量由外部环境引起了,显著地,SSC趋于增加。整体地,在沉积分泌物的锋利的减少在长江河口引起了同步SSC减少。但是在SSC从盆在沉积分泌物在对锋利的减少的SSC的反应显示了增加的趋势,显示的synchronicity和差别的地方,仍然有区域。

  • 标签: 悬浮泥沙浓度 长江口 差异性 同步性 流域输沙量 三峡水库蓄水
  • 简介:差别顺序的想法给X()={x=(xk):xX}与X=l,c和c,0被Kizmaz介绍[12]。在这份报纸,用moduli的一个序列,我们定义一些概括差别顺序空格并且给某包括关系。

  • 标签: 序列空间 弹性模量 广义差分 定义
  • 简介:Inthepresentpaper,aclassofexplicitforwardtime-differenceschemesareestablishedfromageometricviewwithstrictanalyticaldeductions.Thisclassincludestheschemeswithaconstanttimeintervalandwithadjustabletimein-tervals,whichisprovedtobeeffectiveandremarkablytime-savinginnumericaltestsandapplications.

  • 标签: GEOMETRIC principle SQUARE conservation CONSISTENT DISSIPATION