简介：基于知识分类，确定教学目标并努力构建与之相适应的课堂教学策略，发挥教学目标导教、导学、导测的功能，有助于提高教学实效。

简介：摘要课标明确指出，作文教学是小学语文教学的重要教学内容，学生作文水平的高低直接决定着教师的教学效果和学生的语文基本功。

简介：Thesafetyofrailisveryimportantforthedevelopmentofhighspeedrailway,anditisnecessarytoinvestigatethefeaturesofinnercracksinrail.InordertoobtainthefeaturesofAcousticEmission(AE)sourcesofinnercracksinrail,AEsourceswithdifferenttypes,depthsandpropagationdistancesareexaminedforcrackinrail.Thefiniteelementmethodisutilizedtomodeltherailwithcracksandtheresultsofexperimentdemonstratetheeffectivenessofthismodel.WavelettransformandRayleigh-LambequationsareutilizedtoextractthefeaturesofcrackAEsources.TheresultsillustratethattheintensityratioamongAEmodescanidentifytheAEsourcetypesandtheAEsourceswithdifferentfrequenciesinrail.ThereareuniformAEmodefeaturesexistingintheAEsignalsfromAEsourcesinrailweb,howeverAEsignalsfromAEsourcesinrailheadandrailbasehavethecomplexandunstableAEmodes.DifferentAEsourcetypeshavethedifferentpropagationfeaturesinrail.ItishelpfultounderstandtherailcracksanddetecttherailcracksbasedontheAEtechnique.

简介：Vanadiumnitridewassynthesizedbyone-stepmethodusingV2O5andcarbonblackasrawmaterialsinnitrogenatmosphere.ThephasesofdifferentreactionproductspreparedindifferentreactiontemperatureswereanalyzedbyX-raydiffraction(XRD),andthedynamicbehavioroftheprocessofsynthesizingvanadiumnitride(VN)byone-stepmethodwasstudiedwithnon-isothermalthermogravimetry.Themechanismfunctionandkineticparametersofreactionprocesswerecalculatedbythermalgravimetricanalyses(TGA),andthereactionrateequationwasestablished.TheXRDresultsshowthatforthesamplestestedwithminimalVNafterholdingfor4hat1273K,themainphaseofproductsisVNat1476K,whilesomevanadiumnitridestransformintovanadiumcarbidesagainover1573K.ItisfoundthatN2isbeneficialtostimulatereductionandproceedcarbonizationreaction,andthereductionandnitridationreactioncanoccursimultaneously.TheactivationenergyofpreparingVNbyone-stepmethodis104.005kJ·mol-1,andthefrequencyfactoris470.52at1280–1358K,and150.052kJ·mol-1and2.359104at1358–1426K,respectively.

简介：Buildingcodeshavewidelyconsideredtheshearwavevelocitytomakeareliablesubsoilseismicclassification,basedontheknowledgeofthemechanicalpropertiesofmaterialdepositsdowntobedrock.Thisapproachhaslimitationsbecausegeophysicaldataareoftenveryexpensivetoobtain.Recently,otheralternativeshavebeenproposedbasedonmeasurementsofbackgroundnoiseandestimationoftheH/Vamplificationcurve.However,theuseofthistechniqueneedsaregulatoryframeworkbeforeitcanbecomearealisticsiteclassificationprocedure.ThispaperproposesanewformulationforcharacterizingdesignsitesinaccordancewiththeAlgerianseismicbuildingcode(RPA99/ver.2003),throughtransferfunctions,byfollowingastochasticapproachcombinedtoastatisticalstudy.Foreachsoiltype,thedeterministiccalculationoftheaveragetransferfunctionisperformedoverawidesampleof1-Dsoilprofiles,wheretheaverageshearwave(S-W)velocity,Vs,insoillayersissimulatedusingrandomfieldtheory.Averagetransferfunctionsarealsousedtocalculateaveragesitefactorsandnormalizedaccelerationresponsespectratohighlighttheamplificationpotentialofeachsitetype,sincefrequencycontentofthetransferfunctionissignificantlysimilartothatoftheH/Vamplificationcurve.ComparisonisdonewiththeRPA99/ver.2003andEurocode8(EC8)designresponsespectra,respectively.Intheabsenceofgeophysicaldata,theproposedclassificationapproachtogetherwithmicro-tremormeasurescanbeusedtowardabettersoilclassification.

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简介：蜿蜒地流的河免职的水库建筑学是建筑群，当层厚度在地震垂直分辨率下面时，传统的地震外形解释方法不能描绘它。在这研究，为点酒吧描述的一个地震sedimentology解释方法和工作流被造。第一，地震频率的影响和在地震思考以后的沙岩厚度被露头察觉与渗透雷达(GPR)并且地震前面的建模的地面分析。(1)沙岩厚度能影响点工具条建筑学的地震思考，这被发现。与从1/4波长增加沙岩厚度()到/2，从模糊思考各种各样的地震思考几何学，V类型思考到X类型思考；(2)地震频率能影响水库地震思考几何学。地震事件跟随使倾向的侧面的沉积表面，它是isochronicdepositional边界，在高频率地震数据当事件延长时，lithologic出现，它是水平，在低频率数据。第二，为薄层depositional描述的阶层片解释方法与地震前面的建模被讨论。最后，一个方法和工作流基于上述学习被造它包括地震频率分析，分阶段执行的90o，stratal切和片和地震侧面的综合解释。这个方法在泰戈在真实数据学习被使用浅，墨西哥湾。蜿蜒地流的河的免职的二个事件在学习层被认出。更低的单位的沙岩，在低基础水平舞台被形成，散布有限。沙岩分发尺寸和隧道蜿蜒在上面的层变得更大，它是高基础的水平免职。

简介：Thealternatingdirectionmethodofmultipliers(ADMMforshort)isefficientforlinearlyconstrainedconvexoptimizationproblem.ThepracticalcomputationalcostofADMMdependsonthesub-problemsolvers.Theproximalpointalgorithmisacommonsub-problem-solver.However,theproximalparameterissensitiveintheproximalADMM.Inthispaper,weproposeahomotopy-basedproximallinearizedADMM,inwhichahomotopymethodisusedtosolvethesub-problemsateachiteration.Undersomesuitableconditions,theglobalconvergenceandtheconvergencerateofO(1/k)intheworstcaseoftheproposedmethodareproven.Somepreliminarynumericalresultsindicatethevalidityoftheproposedmethod.

简介：Freevibrationanalysisofcompositelaminateswithdelaminationsisperformedbasedonathree-dimensionalsemi-analyticalmodelestablishedbyintroducingthelocalradialpointinterpolationmethod(LRPIM)intoaHamiltonsystem.Thegoverningequationisderivedwithatransfermatrixtechniqueandaspringlayermodelbasedonalocalweak-formequivalenttothemodifiedHellinger-Reissnervariationalprinciple.Mainsuperiorityofthepresentmodelisthatthescaleofthegoverningequationinvolvesonlytheso-calledstatevariablesatthetopandbottomsurfaces,andisinsensitivetothethicknessandthelayernumberofthecompositelaminates.Severalnumericalexamplesforanalyzingthevibrationfrequenciesandmodeshapesofdelaminatedcompositebeamsandplatesaregiventovalidatethemodel.Theresultsareingoodagreementwiththepre-existingresults.

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简介：Inordertoenhancethebearingcapacityofnon-circulargearpair,thenon-circulargearpairwithdoublegeneratinganglesisproposedbasedonthedesignideaofunsymmetricalgearwithdoublepressureangles.Thetoothprofileisdesignedbygeneratingcuttingtheory,thepurerollingmathematicmodelthatthecenterlineofunsymmetricalrackrollalongnon-circularpitchcurveisbuilt,thedigitalmodelofnon-circulargearwithdoublegeneratinganglesiscreatedthroughtheseconddevelopmentmethodofCADsoftware,andthenthedrivecharacteristicandtoothstrengthareanalyzed.Theresultsshowthatthedesignmethodfordoublegeneratinganglesnon-circulargearproposedinthispaperisfeasible,whichissignificanttoimprovethebearingcapacityofnon-circulargearpair.

简介：Thewatertemperaturestratificationinlargereservoirsmighthaveseriousecologicalandenvironmentalconsequences.Themodelingofthetemperaturedistributionanditshistoryisofgreatimportancebothforstudyingtheunderlyingmechanismsandforcontrollingtheadverseeffects.Todevelopaneffectiveandefficientmethodforsimulationoftemporalandspatialtemperaturevariations,alatticeBoltzmannmethod(LBM)modelfor3-Dthermalbuoyancyflowsisproposedandvalidatedbythetemperaturedatameasuredinamodelreservoir.ThispaperdiscussesimportantaspectsoftheLBManditsturbulencemodel,analyzesthegravitysinkingmechanismofcoldcurrents,anddemonstratesthecomplexityofthetemperatureredistributionprocess.Goodagreementbetweenthesimulatedandmeasuredresultsshowsthatthenewlydevelopedmethodisfeasibleandpowerful,anditwillbeusedforthewatertemperaturepredictioninactualreservoirsinanearfuture.

简介：Acoupledimmersedboundary-latticeBoltzmannmethod(IB-LBM)isintroducedtosolvebiomimeticproblems.ComparedtotheconventionalIB-LBM,thestrictsatisfactionofno-slipboundaryconditionisimplementedinthecurrentmethod.Consequently,thephenomenonofflowpenetrationthatisfrequentlyobservedintheconventionalIB-LBMisfullyprevented,andsubsequentlytheforceontheboundarycanbecalculatedmoreaccurately.Thisfeatureisofimportanceforthesimulationofbiomimeticproblems.Moreover,byapplyingtherelationshipbetweenthevelocitycorrectionandforcingterm,theboundaryforcecanbecalculatedeasily.Severalbiomimeticproblemsarethensimulated.Basedonthegoodagreementbetweenthecurrentresultsandthoseintheliterature,itmaybeconcludedthatthepresentIB-LBMhasthecapabilitytohandlevariousbiomimeticproblems.

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简介：在这份报纸，我们使用任意的Riemann解答者，它不能满足Maire的要求，到Maire发展在的基于节点的Lagrangian计划[P.H。Maire等，暹罗J。Sci。Comput，29(2007)，1781-1824]。特别地，我们使用所谓的多液体隧道onAveraged体积(MFCAV)Riemann解答者和适应地把MFCAV解答者与另外的更消散的Riemann解答者相结合到Maire的计划的一个Riemann解答者。任何一个二个解答者都不满足Maire的要求，这被注意。数字实验被介绍证明二个Riemann解答者的应用程序是成功的。[从作者抽象]

简介：Thesingularboundarymethod(SBM)isarecentmeshlessboundarycollocationmethodthatremediestheperplexingdrawbackoffictitiousboundaryinthemethodoffundamentalsolutions(MFS).Thebasicideaistousetheoriginintensityfactortoeliminatesingularityofthefundamentalsolutionatsource.Themethodhassofarbeenappliedsuccessfullytothepotentialandelasticityproblems.However,theSBMsolutionforlarge-scaleproblemshasbeenhinderedbytheoperationcountofO(N~3)withdirectsolversorO(N~2)withiterativesolvers,aswellasthememoryrequirementofO(N~2).Inthisstudy,thefirstattemptwasmadetocombinethefastmultipolemethod(FMM)andtheSBMtosignificantlyreduceCPUtimeandmemoryrequirementbyonedegreeofmagnitude,namely,O(N).Basedonthecomplexvariablerepresentationoffundamentalsolutions,theFMM-SBMformulationsforbothdisplacementandtractionwerepresented.Numericalexampleswithuptohundredsofthousandsofunknownshavesuccessfullybeentestedonadesktopcomputer.TheseresultsclearlyillustratedthattheproposedFMM-SBMwasveryefficientandpromisinginsolvinglarge-scaleplaneelasticityproblems.

简介：摘要目的探析院前急救护理路径在脑卒中患者院前急救中的应用效果。方法选取我院收治的224例脑卒中患者为研究资料，将所有患者随机分为两组，每组112例。对照组给予常规院前急救护理，观察组给予院前急救护理路径，对比分析急救效果。结果观察组的死亡率（3.57%）、致残率（7.14%）均优于对照组（13.39%、24.11%），组间有显著差异（P＜0.05）；观察组从接诊到入院治疗的间隔时间优于对照组（P＜0.05）。结论脑卒中患者院前急救中给予院前急救护理路径可降低患者的致残率和死亡率，缩短接诊到治疗的间隔时间，提升患者的生存质量，值得在临床上进一步推广和应用。

简介：新课标指出“通过义务教育阶段的数学学习，学生能够获得适应未来社会生活和进一步发展所必需的重要数学知识(包括数学事实、数学活动经验)以及基本的数学思想方法和必要的应用技能”。本文从分类讨论思想的概念和特点，引起分类讨论的原因、分类讨论的理论依据、解答分类讨论型问题的步骤以及分类讨论思想在数学教学中的应用举例等内容展开，比较系统、全面地介绍了分类讨论思想。

简介：在高中体育教学中运用分类教学模式，不仅能够提高学生学习兴趣、改善学生不良的体育运动习惯、激发学生体育运动兴趣，而且对培养学生终身体育锻炼也具有重要的意义。简单介绍了分类教学模式，然后详细分析高中体育教学中分类教学模式的应用实践，以供参考。

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