简介：such type of scheme is extnded to the 2D shallow water equations. A finite volume method on arbitrary quadrilateral elements is presented to solve shallow water flow problems with complex boundaries and having discontinuities.,A high-resolution finite volume numerical method for solving the shallow water equations is developed in this paper. In order to extend finite difference TVD scheme to finite volume method,Fig. 3(a) Water surface elevation for a rectangular dam-break Fig. 3(b) Contour of surface elevation for a rectangular dam-break

简介：and satellite element 1.,and the satellite element 1. a hybrid type form of  ,for the element

简介：fig. 4(a) water surface elevation for a circular dam-break circular dam-break,fig. 3(a) water surface elevation for a rectangular dam-break  ,fig. 4(c) velocity field for a circular dam-break

简介：以便调查水和氯化物离子在损坏水泥的运输，三水泥打字被准备，骑车的结冰融化(英尺)并且压缩装载被采用到导致损坏到具体。超声的脉搏速度技术被用于评估损坏度具体，并且损坏水泥的缺点被X-CT也检测。水吸收和氯化物离子穿透性被用于描述损坏水泥的运输性质。在水上损坏完成度吸收率和氯化物离子穿透性详细被调查，关系也被建立。结果证明水泥的水吸收使回答各种各样由于水泥的差别损坏度类型和损坏方法。为有类似的损坏度的一样的水泥，英尺的水吸收率损坏了水泥通常比装载损坏的水泥的大。如果健全水泥的原来的穿透性更高，损坏水泥的氯化物离子穿透性与增加损坏度线性地增加，它是更敏感的损坏度。

简介：Basedonlinearporoelasticandhydrogeologytheory,amathematicalexpressiondescribingtherelationshipbetweenwaterlevelchangeandaquifervolumestrainisputforward.Combinedwithearthtidaltheory,weanalyzetheresponsecharacteristicsfromwell-aquiferwaterlevelchangetoearthtideofvolumestrainandpresentamethodofvolumestraininversionfromwaterlevelchange.Comparingtheresultsofinversionwithrealobserveddata,wefoundthatthereisagoodconsistency.Thissuggeststhatthemethodofvolumestraininversionfromwaterlevelchangeisproper.Itwillofferareferenceforlearningabouthydrogeologycharacteristics,volumestrainandsearchingforprecursoranomalies.

简介：通过对286L型船用柴油机失效活塞材料内部质量的理化检验分析,阐述了船用柴油机失效活塞材料的组织特点和内部缺陷等级,结合失效活塞特定的外观破坏形貌以及热处理工艺特点,指出了造成这次活塞失效的主要原因是活塞内部存在组织缺陷和内应力共同造成的。同时,为防止今后出现类似的失效问题,本文提供了指导性的建议。

简介：摘要：如今，随着国家对环保问题的重视程度越来越高，对于环境污染的打击力度越来越强，混凝土生产企业实现浆水零排放已迫在眉睫。根据查阅相关文献，在研究过程中，通过系统的试验分析，发现按一定比例使用回收水，对于混凝土性能的影响并不大，本文通过对回收水进行试验，分析其影响，进而实现生产需要。

简介：Thecoarseporesystem,interfacialtransitionzone(ITZ)betweenaggregateandpastematrixandvolumefractionofunhydratedcementinconcrete(w/c=0.3)containingmineraladmixtureswerequantitativelycharacterizedbythescanningelectronmicroscope-backscatteredelectron(SEM-BSE)imageanalysistechnique.Theexperimentalresultsshowthatcompoundadditionofslagandflyashdecreasesthecoarseporosityfrom10.17%to3.74%andthethresholddiameterofcoarseporesizefrom345μmto105μmcomparedwithconcrete(w/c=0.30)withoutmineraladmixtures;Moreoverwithcompoundadditionofflyashandslag,thevolumeproportionofunhydratedcementinpastematrixisreducedby30%,themaximumamountofcoarseporesintheITZbetweenaggregateandpastedecreasesfrom13.11%to5.57%andthethicknessofITZisreducedby37%,comparedwithconcretewithoutmineraladmixtures.

简介：Inthiswork,compressive,flexuralandsplittensilestrengthtogetherwithcoefficientofwaterabsorptionofhighperformanceself-compactingconcretecontainingdifferentamountofFe2O3nanoparticleshavebeeninvestigated.ThestrengthandthewaterpermeabilityofthespecimenshavebeenimprovedbyaddingFe2O3nanoparticlesinthecementpasteupto4.0wt%.Fe2O3nanoparticleasaforeignnucleationsitecouldaccelerateC-S-HgelformationasaresultofincreasedcrystallineCa(OH)2amountespeciallyattheearlyageofhydrationandhenceincreasethestrengthofthespecimens.Inaddition,Fe2O3nanoparticlesareabletoactasnanofillersandrecovertheporestructureofthespecimensbydecreasingharmfulporestoimprovethewaterpermeability.Severalempiricalrelationshavebeenpresentedtopredicttheflexuralandthesplittensilestrengthofthespecimensbymeansofthecorrespondingcompressivestrengthatacertainageofcuring.Acceleratedpeakappearanceinconductioncalorimetrytests,moreweightlossinthermogravimetricanalysisandmorerapidappearanceofpeaksrelatedtohydratedproductsinX-raydiffractionresultsindicatethatFe2O3nanoparticlesupto4wt%couldimprovethemechanicalandthephysicalpropertiesofthespecimens.

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简介：Inthepresentpaper,twomodelsbasedonartificialneuralnetworksandgeneticprogrammingforpredictingsplittensilestrengthandpercentageofwaterabsorptionofconcretescontainingZrO2nanoparticleshavebeendevelopedatdifferentagesofcuring.Forbuildingthesemodels,trainingandtestingusingexperimentalresultsfor144specimensproducedwith16differentmixtureproportionswereconducted.Thedatausedinthemultilayerfeedforwardneuralnetworksmodelsandinputvariablesofgeneticprogrammingmodelswerearrangedinaformatofeightinputparametersthatcoverthecementcontent,nanoparticlecontent,aggregatetype,watercontent,theamountofsuperplasticizer,thetypeofcuringmedium,ageofcuringandnumberoftestingtry.Accordingtotheseinputparameters,intheneuralnetworksandgeneticprogrammingmodels,thesplittensilestrengthandpercentageofwaterabsorptionvaluesofconcretescontainingZrO2nanoparticleswerepredicted.ThetrainingandtestingresultsintheneuralnetworkandgeneticprogrammingmodelshaveshownthattwomodelshavestrongpotentialforpredictingthesplittensilestrengthandpercentageofwaterabsorptionvaluesofconcretescontainingZrO2nanoparticles.Ithasbeenfoundthatneuralnetwork(NN)andgeneexpressionprogramming(GEP)modelswillbevalidwithintherangesofvariables.Inneuralnetworksmodel,asthetrainingandtestingendedwhenminimumerrornormofnetworkgained,thebestresultswereobtainedandingeneticprogrammingmodel,when4geneswereselectedtoconstructthemodel,thebestresultswereacquired.Althoughneuralnetworkhavepredictedbetterresults,geneticprogrammingisabletopredictreasonablevalueswithasimplermethodratherthanneuralnetwork.

简介：以现有T、L形钢管混凝土柱试验研究为基础，本文进行了如下工作：（1）针对T、L形钢管混凝土柱的受压约束承载机理，建立了内填混凝土的等效单轴滞回本构模型；（2）建立了悬臂柱在反复荷载作用下的滞回全过程分析模型，编制了T、L形钢管混凝土柱的滞回全过程分析程序；（3）对所完成的试件进行了滞回全过程数值分析，分析与试验结果在荷载-位移和荷载-应变两种层次上进行了对比，验证了本文模型和分析程序的正确性，表明该程序能从构件、材料两种层次上表现出钢管混凝土柱的非线性发展过程。之后，对T、L形钢管混凝土柱中有代表性混凝土和钢单元应力-应变发展全过程进行了数值模拟。结果表明本文模型能用于T、L形钢管混凝土结构的非线性分析。

简介：AM_L3.8earthquakeoccurredonFebruary23,2014inRongchangCounty,whichislocatedatthesouthernedgeoftheSichuanBasinintheborderareabetweenSichuanandChongqing.ThispaperpresentsresultsoffocalmechanismsolutionofthisearthquakeusingtheCAP(cutandpaste)methodbasedonbroadbandseismogramsrecordedbyregionalseismicstations.OurresultsshowthatthemomentmagnitudeisM_W3.09andfocaldepthis3km.ThehypocenterofthisearthquakeislocatedclosetoaburiedfaultintheLuoguangshananticline.Oilprospectinganddeepdrillingdataindicatethatthisburiedfaultisathrustfault,strikingSW230°,dippingNW45°,and1.7kmdeep.Therearesomeinjectionwellswithintheanticline,andsignificantinjection-inducedearthquakeswereobservedduringtheperiodsofinjectionofwastewaterintothedeepformationsthroughthosewells.ThebestdoublecouplesolutionoftheM_L3.8earthquakeis247°,48°and104°forstrike,dipandrate,respectively,foronenodalplane(and46°,44°and74°foranothernodalplane),whichisinagreementwiththegeometryoftheburiedfault.Therefore,weconcludethattheM_L3.8Rongchangearthquakeispossiblytheresultoffaultingalongtheburiedreversefaultinducedbywaterinjectionunderthecompressivestressregimeinthearea.

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简介：采用热重-微分热重技术研究了1-L-谷氨酸-1-脱氧-D-果糖的热失重和裂解温度,通过在线裂解气质联用技术分别分析研究了无氧和有氧条件下1-L-谷氨酸-1-脱氧-D-果糖在300℃、600℃、750℃和900℃四个温度的热裂解产物。研究结果表明1-L-谷氨酸-1-脱氧-D-果糖的裂解温度为161.3℃,在700℃时失重达到90.50%。无氧和有氧条件下裂解产物的种类和数量随着裂解温度升高而增多,有氧条件下裂解产物总数稍多于无氧条件,但种类有明显差异。无氧裂解和有氧裂解产物主要为酮类、吡咯类、吡啶类、呋喃类、吡嗪类、吲哚类以及少量芳香族化合物。有氧热裂解产物的香韵分析结果表明1-L-谷氨酸-1-脱氧-D-果糖裂解产物具有烘烤香、坚果香、甜香、花香、奶香等香韵。

简介：HippocampalvolumelossisanimportantbiomarkerindistinguishingsubjectswithAlzheimer’sdisease(AD)anditsmeasurementinmagneticresonanceimages(MRI)isinfluencedbypartialvolumeeffects(PVE).Thispaperdescribesapost-processingapproachtoquantifyPVEforcorrectionofthehippocampalvolumebyusingaspatialfuzzyC-means(SFCM)method.Thealgorithmisevaluatedonadatasetof20T1-weightedMRIscanssampledattwodifferentresolutions.Thecorrectedvolumesforleftandrighthippocampus(HC)whichare23%and18%forthelowresolutionand6%and5%forthehighresolutiondatasets,respectivelyarelowerthanhippocampalvolumeresultsfrommanualsegmentation.ResultsshowtheimportanceofapplyingthistechniqueinADdetectionwithlowresolutiondatasets.

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简介：摘要社区获得性肺炎(community-acquiredpneumonia,CAP)是威胁人类健康的常见感染性疾病之一。我国2016年制定《社区获得性肺炎诊断和治疗指南》建议，需入院治疗、但不必收住ICU的CAP患者经验性抗感染方案有3种1，然而，由于各种病原菌在CAP中的地位尚不明确，CAP的最佳抗生素治疗方案至今尚未明了。本文试图对β-内酰胺类联合大环内酯类以及呼吸喹诺酮类两种治疗方案进行比较。

简介：原癌基因c-Cbl相关收是白CAP(c-Cblassociatedprotein)是有多个结合位点的新信号分子家族成员,VeredRibon1998年发现,并分离纯化.CAP与胰岛素刺激、c-Cbl磷酸化以及GLUT4转位密切相关,且是在胰岛素增敏剂作用下PPARγ启动转录的首位信号蛋白,因而成为人们争相研究的热点.以下就CAP研究进展作一综述.