简介：Anewelectrochemicaloscillatorysystemofbromateinalkalinesolutionisreported.InPt-Bromate-Alkalinesolutionsystem,twodifferenttypesofelectrochemicaloscillations(TypeⅠandTypeⅡ)canbeobserved.TypeⅠappearsbeforehydrogenevolutionandTypeⅡinvolvesperiodichydrogenevolution.TypeⅠrelatestotheadsorption/desorptionofthehydrogenonplatinumelectrode,andTypeⅡwithperiodicoscillationstemsfromthecouplingofelectrochemicalreactions(thereductionofbromateandevolutionhydrogenreaction)withmasstransfer(diffusionandconvection).Moreover,undertherightconditions,thetwotypesappearindifferentoscillatorymodes,forexample,simpleperiodicalmodeandmixedone,etc..Crossedcycleinthecyclicvoltammograms,whichisthebasiccharacteristicsforelectrochemicaloscillatorysystems,hasalsobeenobservedasexpected.

简介：Basedonphase-planeorbitanalysis,themathematicalmodelofpiecewise-smoothsystemsofmulti-degree-of-freedomunderthemodecoordinateisestablished.Approximateanalyticalsolutionunderthephysicalcoordinateofmulti-degree-of-freedomself-excitedvibrationinducedbydryfrictionofpiecewise-smoothnonlinearsystemsisderivedbymeansofaveragemethod,theresultsofwhichagreewiththoseofthenumericalsolution.Aneffectiveandreliableanalyticalmethodinvestigatingpiecewise-smoothnonlinearsystemsofmulti-degree-of-freedomhasbeengiven.Furthermore,thispaperqualitativelyanalysesthecurvesaboutstationaryamplitudeversusrubbingvelocityofhandsandversusnaturalfrequencyofhands,andaboutangularfrequencyversusrubbingvelocityofhands.Theresultsprovideatheoreticalbasisforidentifyingparametersofthesystemandtheanalysisofsteadyregion.

简介：Inthispaperweconsiderthefollowingproblemui=△u^m+bi(u^n)xLetu=u(x,t)beacontinuousweaksolutionoftheequationinR^N×(0,T)forsomeT>0.Thenweconclude;CorrespondingtouthereisauniquenonnegativeBorelmeasurevonR^Nwhichistheinitialtraceofu;thereistheglobalinequalityofHarnacktypeforu;theinitialtracevmustbelongtoacertaingrowthclass;consequently,bycombiningtheresultsmentionedaboveau-niquenessconclusionisestablished.

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简介：Thispaperinvestigatesthestabilityandconvergenceofsomeknowndifferenceschemesforthenumericalsolutiontoheatconductionequationwithderivativeboundaryconditionsbythefictitiousdomainmethod.Thediscretevari-ablesatthefalsemeshpointsarefirstlyeliminatedfromthedifferenceschemesandthelocaltruncationerrorsarethenanalyzedindetail.Thestabilityandconvergenceoftheschemesareprovedbyenergymethod.Animprovementisproposedtoobtainbetterschemesovertheoriginalones.Severalnumericalexamplesandcomparisonswithotherschemesarepresented.

简介：Inthispaper,theequilibriumsurfacetensionandthedynamicsurfacetensionofaqueousTritonX100solutionattemperature25℃weremeasuredbymeansofWilhelmyplatemethodandmaximalbubblepressuremethodrespectively.Thedeterminedcriticalmicellarconcentration(cmc)ofTritonX-100at25℃is2.2×10^-4mol/dm^3.TheadsorptionmechanicsofTritonX-100atair/solutionwasdetermined.Forthesubmicellarconcentrationsitisdiffusion-controlled.Thediffusioncoefficientwascalculatedfromtheexperimentaldataintherangeofshortlimit.Intherangeoflongtimeadsorption,thesubsurfaceconcentrationisfittedfromthemeasureddynamicsurfacetensions.

简介：Themainrequirementsforcurrentmedicalpracticeincludetheabilitytosolvecomplexmedicalproblemsandtohandlemedicaldevices.Asaresult,graduatesofmedicineareexpectedtohaveanadequatelevelofphysicalandtechnicalliteracy.Theaimofourstudywastofindouthowstudentsofmedicine,aftercompletingthesubjectBiophysics,solveamodelproblemfrommedicalpracticeandthefactorsthatcanaffectthecorrectnessoftheirsolution.Onehundredandtwenty-ninestudentswereaskedtorespondtothefollowingproblem:“Atfirstsight,astethoscopeappearstobeingoodcondition(bell,diaphragm,andtransfersystem)butyoudonothearanythingduringauscultation.Givereasons.”Alloftheanswerswerecategorisedandevaluatedquantitativelyandqualitatively.Thestudentswerenotabletocomprehensivelysolvethisproblem.Theyreliedontheirknowledgeofthemethodologyofmeasurementratherthanonthephysicalprinciplesofthemedicaldevice.Thesolutionssignificantlydependedongenderandtheirexperiencebeforeenteringmedicalschool.Therefore,weproposetheuseofproblem-basedlearningthatfocusesonrealpracticeproblemsintheteachingprocessatschoolsofalllevels.Implementingthismethodofteachingoverthelong-termwillenablestudentstofindtherightalgorithmforproblem-solving.

简介：以便执行decolorization，污泥蛋白质答案，黑暗棕色的结束到从激活的污泥的黑答案，面对氢受到60Co光线照耀过氧化物。UV/Visspectrophotometric方法被用来在着色法上调查H2O2的效果在光线照耀下面的污泥蛋白质答案的明显的动力学和率常数。另外，照耀剂量，起始的污泥蛋白质答案集中，和pH的效果在污泥蛋白质答案的decolorization效率上珍视被学习。结果证明污泥蛋白质答案的明显的动力学是的decolorization一阶的反应。答案decolorization百分比随照耀剂量的增加或起始的污泥蛋白质答案集中的减少增加了。pH价值的考试结果证明污泥蛋白质解决方案能更高效地比在酸媒介在碱的媒介被将脱色。而且，感觉评估和foamability分析显示在H2O2氧化下面的照耀的样品显示出更好感觉的分数和foamability。

简介：TheinfluenceofcalcinationtemperatureonTiO2nanotubes’catalysisforTiO2/UV/O3wasinvestigated.TiO2nanotubes(TNTs)werepreparedviathesol-gelmethodandcalcinedat300—700℃,whichwerelabeledasTNTs-300,TNTs-400,TNTs-500,TNTs-600andTNTs-700,respectively.TNTswerecharacterizedbytransmissionelectronmicroscopy(TEM)andX-raydiffraction(XRD).ItisfoundthatTNTscalcinedat400℃showedthebestthermalstability.Whenthecalcinationtemperatureincreasedfrom400℃to700℃,thespecialstructureoftubeswasdestroyedandgraduallyconvertedintonanorodsand/orparticles.Thetransformationfromanatasetorutileoccurredat600℃,andtherutilephasewasenhancedwhenthecalcinationtemperaturewasincreasedtoover600℃.Thecalcinationtemperature’sinfluenceonTNTs’adsorptionactivityforchemicaloxygendemand(COD)andcatalyticactivityforTiO2/UV/O3wasinvestigatedinlandfillleachatesolution.Inlandfillleachatesolution,theadsorptionactivityofCODdecreasedinthereducedorderofTNTs-300,TNTs-400,TNTs-500,TNTs-600andTNTs-700.Inphotocatalyticozonation,TNTs-400showedthebestcatalyticactivitywhileTNTs-700exhibitedtheworst.Inotherthreeprocesses,theCODremovalofTNTs-300/UV/O3washigherthanthoseofTNTs-500/UV/O3andTNTs-600/UV/O3inthefirst20min,andthenbecameclosetothoseofthelattertwointhefollowing40min.ComparedwithTNTs-300andTNTs-400,TNTs-600hadthebestanti-foulingactivity,whileTNTs-500andTNTs-700hadloweranti-foulingactivitythantheformerthree.Inphotocatalyticozonation,thecalcinationtemperatureof400℃wasappropriatewhenTNTswereobtainedatthesynthesistemperatureof105℃.