简介：Theobjectiveofthisstudywastoinvestigatetheeffectofgelatin(SG)isolatedfromsalmonskinanditshydrolysate(SGH)onphotoagingskin,andthemechanismresponsibleforanti-photoaging.TheaveragemolecularweightsofSGandSGHwere65kDaand873Da,respectively.TheaminoacidcompositionsofSGandSGHweresimilar.Bothofthemwereabundantinhydrophobicaminoacids.Twenty-fivepeptideswereidentifiedfromSGH.SGandSGHcouldimproveUVirradiation-inducedpathologicalchangesofmacroscopicaltissuetextureandskinmorphology.Hydroxyprolinecontentisanindicatorofmatrixcollagencontent,SGandSGHcouldinhibitthedecreaseofhydroxyprolinecontentinphotoagingskininadosedependentmanner.Inaddition,SGandSGHcouldalleviateUVirradiation-inducedoxidativedamagestoskinbyincreasingtheactivitiesoftotalsuperoxidedismutase(T-SOD),glutathioneperoxidase(GSH-Px)andcatalase(CAT),increasingthecontentofglutathione(GSH)anddecreasingthecontentofmalonaldehyde(MDA).Moreover,SGandSGHcouldenhanceimmuneregulationsystembyincreasingthethymusindex.Thus,theanti-photoagingmechanismsofSGandSGHwerebyinhibitingthedepletionofantioxidantdefensecomponents,involvinginthesynthesisofcollagenandenhancingthefunctionofimmunesystem.Besides,SGHshowedabetterresultinprotectingskinfromphotoagingthanSG.

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简介：Theproblemoficeinducedvibrationiscommontooceanengineeringofcoldregioncountries.Tostudytheiceinducedvibrationofacompliantconicalstructure,aseriesofmodeltestshavebeenperformedandsomebreakthroughprogressesmade.Theicesheetbeforethecompliantconicalstructureisfoundtofailbytwo-timebreakinginthetests.Theprocessoftwo-timebreakingbehavesintwomodes,andthegeneralcontroloftheiceandstructuralconditionsdeterminethemodeinwhichtheiceforcewouldbehave.Twodynamiciceforcefunctionsareestablishedrespectivelyforthetwomodesoftwo-timebreakingprocessinthispaper.Thenumericalsimulationresultsareingoodagreementwiththemeasuredresults,indicatingthatthedynamiciceforcefunctionsgiveninthispapercanfullyreflecttherealsituationofthedynamiciceforceonacompliantconicalstructure.

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简介：Thispaperpresentsthetestofashipmodelforthedesignofabackward-bentductoscillatingwatercolumntypewaveenergyconversionsystem,tosupplyelectricpowerforalightship.Thissystemsuggestsanewwaytoproduceelectricpowerautomaticallyforlargelightships.

简介：NeomysisawatschensiswascollectedonthewestcoastofJiaozhouBay,Qingdaoin1992andacclimatedinthelaboratoryconditions.Theacutetoxicitymethodusing4～6dayjuvenilemysidofthisspeciesisstudied.ThespeciesiscomparedwithM.bahiaintaxonomy,geographicdistribution,morphology,aswellasthesensitivitytoAbstracttoxins.Basedontheresults,werecommendN.awatschensistobeastandardmarineorganismfortoxicitytestinChinaandthemethodtobeappliedintoxicityevaluationofdrillingfluids.Inthispaper,wereporttheresultsoftheabovestudiesandtheapplicationofthemethodintheevaluationofseveraldrillingfluidproducts.

简介：TheLouisschemeandtheCOAREalgorithm(version3.0)aretestedagainsteddycovarianceandinertialdissipationmethodsforfrictionvelocityestimatesindifferentwind-sea/swellregimes.Atmosphericforcingdata,tabulatedbyDonelanetal.(1997.JPhysOceanog,27:2087～2099),werecollectedfromamastontheforedeckofaSWATH(smallwater-planearea,twinhull)shipindeepseaofftheStateofVirginiaduringthesurfacewavedynamicsexperiment.Thesedataarerepresentativeoflowtomoderatewindregimes.TheaerodynamicroughnesslengthisdeterminedbyusingtheCharnockrelationship.TheintercomparisonshowsthattheLouisschemeandtheCOAREalgorithmunderestimatethefrictionvelocityby6%and3%respectivelyunderpurewindseaconditions,15%and13%respectivelyundercrossswellconditions,and21%and17%respectivelyundercounterswellconditions.Theanalysisshowsthattheseunderestimationswerecausedbythemethodchosentodeterminetheaerodynamicroughnesslengthbecauseitsignificantlyunderestimatestheaerodynamicroughnesslength.Itisespeciallytrueunderthecrossswellandcounterswellconditions.