简介：Forrealizingdiffusedanodeattachmentinpurenitrogenarcs,aspecialarcplasmageneratorwasdesignedandcombinedwithsuitableworkingparameterssuchasgasflowrateandarccurrent.Theanodehasaflow-restrictorchannelof2.8mmdiameteranddownstreamexpansionhalf-angleof8°,withthepurposeofcreatingadispersednitrogen-arccolumnbystronggasdynamicexpansioneffect.Resultsshowthat,whenthermalblockingconditionexistedintheflowrestrictorandthecathodecavitypressurewashigherthanthatintheexitchamberbyatleast9kPa,theactionduetogasdynamicexpansioncouldbemuchstrongerthantheself-magneticcontractioneffectofthearcandthenitrogenarccolumncouldbeeffectivelydispersedtoformasufficientlydiffusedattachmentonthewater-cooledanodesurface.

简介：Basedonthevariationandharmonicequationsandbytakingthemaximumamplitudeoftheshellcenterastheperturbationparameter,nonlinearvibrationofthinshallowconicshellsundercombinedactionofperipheralmomentandtransverseloadswassolved.Thelinearnaturalfrequencycanbegotbythefirst-orderapproximationandthemoreaccuratenonlinearfrequencyisgotbythesecond-orderapproximationundertheactionofstaticloads.Meanwhilethethird-orderapproximateanalyticexpressionisgivenfordescribingthenonlinearrelationbetweennaturefrequencyandperipheralmoment,transverseloads,amplitude,baseangleunderthesmalldeformation.Withinsomerange,thecomplexandregularityofthenonlinearrelationcanbedirectlyobservedfromthenumericresults.

简介：Thispaperdealswithfinitedeformationproblemsofcantileverbeamwithvariablesec-tionundertheactionofarbitrarytransverseloads.Bytheuseofamethodofvariablereplacement,thenonlineardifferentialequationwithvariedcoefficientfortheproblemcanbetransformedintoanequationwithvariableseparable.Theexactsolutioncanbeobtainedbytheintegrationmethod.Someexamplesaregiveninthepaper,andtheresultsoftheseexamplesshowthatthisexactsolutionincludestheexistingsolutionsinreferencesasspecialcases.