简介:Thelongitudinaloscillationofanonlinearelasticrodwithlateralinertiawasstudied.Basedonthefarfieldandsimplewavetheory,anonlinearSchrodinger(NLS)equationwasestablishedundertheassumptionofsmallamplitudeandlongwavelength.ItisfoundthatthereareNLSenvelopsolitonsinthissystem.FinallythesolitonsolutionoftheNLSequationwaspresented.
简介:TheVenturi-roddecktrayisatypeofdualflowtraysusedinfluegasdesulfurization(FGD)process.Inthispaper,thehydrodynamiccharacteristicsoftheVenturi-roddecktraywerestudiedintheexperimentsandcomparedwiththeconventionalsievetray.Resultsshowedtheturndownratioofthistraywasintherangeof2.71-3.77,whichwasby9%higherthanthesievetray.Besides,thepressuredropofthistraywasbymorethan50%lowerthanthesievetray.Basedontheexperimentaldata,thecorrelationfunctionsforthepressuredropandthefrothheight,respectively,wereobtained.TheindustrialscaleuppracticeofthistrayinFGDprocesswasdescribedwiththeefficiencyofthistraydemonstrated.
简介:Theexactparametricrepresentationsofthetravelingwavesolutionsforanonlinearelasticrodequationareconsidered.Byusingthemethodofplanardynamicalsystems,indifferentparameterregions,thephaseportraitsofthecorrespondingtravelingwavesystemaregiven.Exactexplicitkinkwavesolutions,periodicwavesolutionsandsomeunboundedwavesolutionsareobtained.
简介:Microtubes/rodsofthelayeredmetalhydroxidesaltcompoundCd2(OH)3(DS)·nH2O,whereDSstandsfordodecylsulfatesandwichedbetweentwoadjacentinorganicsheets,havebeensynthesizedforthefirsttimethroughamildhydrothermalreactionroute.Themicrotubes/rodshaveadiameterofabout1mandalengthrangingfromseveralmicronsto20m.Thegrowthprocessofmicrotubes/rodsundertheexperimentalconditionsemployedfollowsadissolution–recrystallizationroute.
简介:Anumericalmodelofthesteelcatenaryriser(SCR)isbuiltbasedontheslenderrodmodel.Theslenderrodmodel,whichdescribesthebehavioroftheslenderriserintermsofthecenterlineposition,cansolvethegeometricalnonlinearityeffectively.Inamarineenvironment,theSCRisunderthecombinedinternalflowandexternalloads,suchaswaveandcurrent.Ageneralanalysisconsidersonlytheinertialforceandthedragforcecausedbythewaveandcurrent.However,theinternalflowhasaneffectontheSCR;itisessentialtoexplorethedynamicresponseoftheSCRwiththeinternalflow.TheSCRalsosufferstheliftforceandthefluctuatingdragforcebecauseofthecurrent.Finiteelementmethodisutilizedtosolvethemotionequations.Theeffectsoftheinternalflow,waveandcurrentonthedynamicresponseoftheSCRareconsidered.TheresultsindicatethattheincreaseoftheinternalflowdensityleadstothedecreaseofthedisplacementoftheSCR,whiletheinternalflowvelocityhaslittleeffectontheSCR.ThedisplacementoftheSCRincreaseswiththeincreaseofthewaveheightandperiod.AndtheincreasingwaveperiodresultsinanincreaseinthevibrationperiodoftheSCR.ThecurrentvelocitychangesthedisplacementsoftheSCRinx-andz-directions.ThevibrationfrequencyoftheSCRiny-directionincreaseswiththeincreaseofthecurrentvelocity.
简介:ThispaperderivestheLindellformulabasedonthegeneralizedvariationalprinciple.ForthecomplexdielectricconstantmeasurementofasmalllossydielectricrodwithRayleigh-Ritzmethod,anaccuratevariationalanalysisisgiven.Theconceptofcomplexfrequencyisintroducedingeneral,andthestabilityofthesolutionisdiscussed.Comparingwiththeresultofperturbationmethod,itisconcludedthatthedeviationofperturbationalgorithmshouldbetakenintoconsideration.
简介:Anovelsurfacewaveplasma(SWP)sourceexcitedwithcylindricalTeflonwaveguidehasbeendevelopedinourpreviouswork.Theplasmacharacteristicshavebeensimplystudied.Inthiswork,ourexperimentaldevicehasbeensignificantlyimprovedbyreplacingtheTeflonwaveguidewithaquartzrod,andthenbettermicrowavecouplingandhighergaspuritycanbeobtainedduringplasmadischarge.Theplasmaspatialdistributions,bothinradialandaxialdirections,havebeenmeasuredandtheeffectofgaspressurehasbeeninvestigated.Plasmadensityprofilesindicatethatthisplasmasourcecanproduceuniformplasmainanaxialdirectionatlowpressure,whichshowsitspotentialinplasmaprocessingonacurvedsurfacesuchasaninnertubewall.Asimplifiedcircularwaveguidemodelhasbeenusedtoexplaintheprincipleofplasmaexcitation.Thedistinguishingfeaturesandpotentialapplicationofthiskindofplasmasourcewithahardwareimprovementhavebeenshown.
简介:六角形结构的单人赛水晶的镍硫化物nanorodshave的粉末在cetyltrimethyl综合了溴化铵(CTAB)/water/hexane/n-pentanol在热水的条件由下面的第四级的微乳液用尿素和二硫化碳的反应,作为硫化物,source.Single水晶的镍nanorods被是使用单人赛水晶的镍硫化物nanorods经由热分解综合了先锋。产品的形态学上的不同反应参数的影响是产品的investigated.Thestructure,形态学和磁性被X光检查衍射(XRD)描绘,传播电子显微镜(TEM),thermogravimetric分析微分的扫描热量计(TGA-DSC)和颤动的样品磁强计(VSM)。磁性的大小的结果证明特定的浸透磁化(sigma_s)和nickelnanorods的coercivity价值(H_c)分别地是37.5emu/g和68.5Oe。
简介:Thispaperproposesanewmethodtopredictthecoronaonsetvoltageforarodplaneairgap,basedonthesupportvectormachine(SVM).BecausetheSVMisnotlimitedbythesize,dimensionandnonlinearityofthesamples,thismethodcanrealizeaccuratepredictionwithfewtrainingdata.Onlyelectricfieldfeaturesarechosenastheinput;nogeometricparameterisincluded.Therefore,theexperimentdataofonekindofelectrodecanbeusedtopredictthecoronaonsetvoltagesofotherelectrodeswithdifferentsizes.Withtheexperimentaldataobtainedbyozonedetectiontechnology,andexperimentaldataprovidedbythereference,theefficiencyoftheproposedmethodisvalidated.Accuratepredictedresultswithanaveragerelativelessthan3%areobtainedwithonly6experimentaldata.
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简介:目的评价髓核摘除联合K-Rod动态固定治疗腰椎间盘突出症的临床疗效及影像学变化。方法2009年1月至2011年11月,对39例单节段或双节段腰椎间盘突出症患者分别采用髓核摘除联合K-Rod动态固定(A组,19例)和经椎间孔椎体间融合(transforaminallumbarinterbodyfusion,TLIF)(B组,20例)治疗。两组患者一般资料比较差异无统计学意义(P>0.05),有可比性。手术前后采用疼痛视觉模拟评分(visualanaloguescale,VAS)及Oswestry功能障碍指数(oswestrydisabilityindex,ODI)进行比较评价,并动态观察术后责任椎间隙高度及腰椎活动度变化情况。结果A组随访时间18~32个月,平均22个月;B组随访时间18~37个月,平均23个月。末次随访两组患者腰腿痛症状明显改善。A组末次随访时VAS为1.16±0.50,ODI为(3.72±3.63)%,较术前VAS5.52±1.58及ODI(50.83±20.28)%有明显降低(P<0.001);B组末次随访时VAS为2.13±0.69,ODI为(18.61±4.07)%,较术前VAS6.50±1.21及ODI(60.56±9.92)%有明显降低(P<0.001)。A组术后手术节段ROM减小,但末次随访时已恢复至术前近60%,B组术后手术节段将为0°。两组相邻节段及腰椎总活动度维持在术前水平。A组末次随访时手术节段椎间隙高度较术前降低约10%,但术后维持在一个较稳定的水平。两组相邻椎间隙高度无明显差异。两组均未见内固定松动、物断裂等情况。结论与融合相比,K-Rod系统保留了腰椎生理曲度和固定节段的活动度,对相邻节段退变无明显影响,短期临床疗效满意,长期疗效有待进一步观察。