简介:Particleinteractionsareofcrucialimportanceinmanyapplicationsincludingfluidizedbedsandotherpowderhandtingsystems.Thepresentcontributiondiscusseshowsurfacepropertiesoftheparticlescanbedeterminedinordertogetquantitativeinformationonparticleinteractions.Forinstance,weapplyadsorptionexperimentsinordertogetinformationondispersiveandpolarinteractions.ThesemeasurementsarecomplementedbycarefulroughnessmeasurementsasweltasFTIR-spectroscopyandTG-MSanalysis.AdhesionforcemeasurementswithAFMandultracentrifugeonwelldefinedidealaswellasheterogeneoussurfacesledtotheintroductionofthreegenerictypesofadhesionforcedistributions:monomodalWeibull.binlodalWeibullandlognormalTheinfluenceofroughnessandadsorbedlayersonadhesionareshown,Inaddition,wediscussimportantaspectsof1hedynamicnatureoftheadhesion/detachmentprocessbymeansofMD-simulations.
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简介:Car-followingtheoryisanimportantresearchdirectioninthefieldofintelligenttransportationsystems(ITS),itdescribestheone-by-onefollowingprocessofvehiclesonthesamelaneintrafficflow,andoneofitsimportantissuesiscongestioncontrol.Toexplorethestrategyforcontrollingtrafficcongestion,thispaperintroducesandanalyzessomeclassiccar-followingmodels,andgivesasystematicreviewoftheirdevelopments.Moreover,inordertointroducetheapproachtoanalyzethestability,takingthefullvelocitydifference(FVD)modelforexample,thelocalandasymptoticstabilityanalysisisdiscussed,whilethecorrespondingnonlinearanalysisisalsoconducted.Then,someperspectivesofthecar-followingmodelaregiveninthefinal.
简介:Theefiectsofmicroscopicthree-bodyforcesontheequatioilofstate(EOS)andthesingleparticlepropertiesofisospinasymmetricnuclearmatterhavebeenstudiedwithinBrueckner-Hartree-Fockframework~[1]Themicroscopicthree-bodyforcemodelconstructedfrommesonexchangecurrentapproachinRef.~[2]hasbeenextendedtoisospinasymmetricnuclearmatter
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简介:Westudymicroscopicspacetimeconvexitypropertiesoffullynonlinearparabolicpartialdifferentialequations.Undercertaingeneralstructurecondition,weestablishaconstantranktheoremforthespacetimeconvexsolutionsoffullynonlinearparabolicequations.Atlast,weconsidertheparabolicconvexityofsolutionstoparabolicequationsandtheconvexityofthespacetimesecondfundamentalformofgeometricflows.
简介:Ashocktubeisusedtoinvestigatethebubbledynamicsundersuddendecreaseofambientpressure.Boththeoscillatingandmonotonouslygrowingbubblesweresimultaneouslyobserved.TheoreticalapproachisbasedontheRayleigh-PlessetandHerring'sequationsforincompressibleandcompressibleliquids,respectively.Consideringthelinearapproximationoftheseequationsforthequasiequilibriumstate,twocriticalWebernumbersaredefined.Theyenableonetopredictthefollowingmodesofthebubbleexpansion:(i)unboundedgrowth,(ii)asymptoticgrowthtolimitedvolumeand(iii)attenuatedoscillations,dependingonthepressureforce,viscosityandcompressibilityoftheliquid.
简介:Thispapercontinuesourrecentworkontherelationshipbetweendiscretecontactinteractionsatthemicroscopicscaleandcontinuumcontactinteractionsatthemacroscopicscale(Hulikaletal.,J.Mech.Phys.Solids76,144–161,2015).Thefocusofthisworkisonadhesion.Weshowthatacollectionofalargenumberofdiscreteelementsgovernedbyathreshold-forcebasedmodelatthemicroscopicscalecollectivelygivesrisetocontinuumfracturemechanicsatthemacroscopicscale.Akeystepistheintroductionofanefficientnumericalmethodthatenablesthecomputationofalargenumberofdiscretecontacts.Finally,whilethisworkfocusesonscalinglaws,themethodologyintroducedinthispapercanalsobeusedtostudyroughsurfaceadhesion.
简介:Wereportacaseofsyndromicgingivalfibromatosiswithnotableocularlesions,bilateralcongenitalcataracts,esotropia,andhighmyopiaofa21-year-oldmalepatientfromChina.Thepatientwasdiagnosedwithgingivalfibromatosisbasedonhismassivegingivalovergrowthandhistologicalfindingsthatwereconsistentwithgingivalfibromatosisthroughagingivalbiopsy.Lensopacityfeatureswerepresentedandphacoemulsificaionwithintraocularlens(IOL)implantationwasperformedtomanagethecataractsinbotheyes.Transmissionelectronicmicroscopywasusedtoinvestigatetheultrastructureoftheremovedlenstissue.Wealsoreviewtheliteratureongingivalfibromatosisandbrieflysummarizetheocularmanifestationsofthisraredisease.