简介：Background:Europeanforestsareconsideredacrucialresourceforsupplyingbiomasstoagrowingbio-economyinEurope.ThisstudyaimedtoassessthepotentialavailabilityofforestbiomassfromEuropeanforestsanditsspatialdistribution.Wetriedtoanswerthequestions(i)howisthepotentialforestbiomassavailabilityspatiallydistributedacrossEuropeand(ii)wherearehotspotsofpotentialforestbiomassavailabilitylocated?Methods:Thespatialdistributionofwoodybiomasspotentialswasassessedfor2020forstemwood,residues(branchesandharvestlosses)andstumpsfor39Europeancountries.UsingtheEuropeanForestInformationSCENario(EFISCEN)modelandinternationalforeststatistics,weestimatedthetheoreticalamountofbiomassthatcouldbeavailablebasedonthecurrentandfuturedevelopmentoftheforestage-structure,growingstockandincrementandforestmanagementregimes.Wecombinedtheseestimateswithasetofenvironmental(siteproductivity,soilandwaterprotectionandbiodiversityprotection)andtechnical(recoveryrate,soilbearingcapacity)constraints,whichreducedtheamountofwoodybiomassthatcouldpotentiallybeavailable.Wemappedthepotentialbiomassavailabilityatthelevelofadministrativeunitsandatthe10km×10kmgridleveltogaininsightintothespatialdistributionofthewoodybiomasspotentials.Results:Accordingtoourresults,thetotalavailabilityofforestbiomassrangesbetween357and551Tgdrymatterperyear.ThelargestpotentialsupplyofwoodybiomassperunitoflandcanbefoundinnorthernEurope(southernFinlandandSweden,EstoniaandLatvia),centralEurope(Austria,CzechRepublic,andsouthernGermany),Slovenia,southwestFranceandPortugal.However,largepartsofthesepotentialsarealreadyusedtoproducematerialsandenergy.Thedistributionofbiomasspotentialsthatarecurrentlyunusedonlypartiallycoincideswithregionsthatcurrentlyhavehighlevelsofwoodproduction.Conclusions:Ourstudyshowshowthefo

简介：WederivedrevisedeffectivediffusionenergybarriersfollowingtheBoltzmanndistributionassumptionforimpurityatomsinabulkmaterialundertheimpactofvariouskindsofpointdefectstorevealtheinsightsofmigrationmechanisms.Theeffectivediffusionenergybarriersofcopperimpuritiesinbulkzirconiumwerecalculatedthroughthefirstprinciplemethodunderthepresentedhypothesis.Ourresults(?E||=1.27eV,?E⊥=1.31eV)agreedwellwiththeexperimentalresults(?E||=1.54eV,?E⊥=1.60eV),whichvalidatedbulkdiffusionasthemajormechanismforcopperdiffusioninzirconium.Theeffectivediffusionenergybarrierscouldbeusedforestimatingwhetherthedefectswillacceleratethediffusionorslowthemdownbyactingastrapsoftheimpurityatoms.Ontheotherhand,thefirstprincipleresultsoftheimpuritydiffusionviadefectscouldbefurtherusedasinputsoflargerscalecomputationalsimulations,suchasMC(MonteCarlo)orPhaseFieldcalculations.

简介：ThedistributionoftheintensityoftheMojiangMS5.9earthquakeinYunnanProvinceisexpounded,andthedamagecharacteristicsofbuildingsandthedamageratioandseismicdamageindexofvariousbuildingstructuresineachintensityareaarecomparedwiththoseofTheChineseSeismicIntensityScale.Themainbasisandmethodofseismicintensityassessmentarediscussedinthispaper.Itisconcludedthat:①Theseismicintensityshouldbebasedontheearthquakedamageofthehousingstructure,whichtakesupahighratiointheseismicintensityassessment.Itisrecommendedthatseismicintensityisestimatedbycalculatingtheaverageseismicdamageindex.②ThehighestintensityoftheMojiangMS5.9earthquakeisVIIIdegrees,withthelongaxistrendinginthenorth-westdirection.TheareaaboveVIIdegreesis5,180km^2.③TheintensitydistributionoftheMojiangMS5.9earthquakemeetsthenationalstandardandthedistributionlawofseismicintensityinYunnan.

简介：Arobustmethodforcharacterizingthemineralogyofsuspendedsedimentincontinentalriversisintroduced.Itencompasses3steps:thefiltrationofafewmillilitersofwater,measurementsofX-rayenergydispersivespectrausingScanningElectronMicroscopy(SEM),androbustmachinelearningtoolsofclassification.ThemethodisappliedtosuspendedparticlescollectedfromvariousAmazonianrivers.Atotalofmorethan204,000particleswereanalyzedbySEM-EDXS(EnergyDispersiveX-raySpectroscopy),i.e.about15,700particlespersamplingstation,whichleadtotheidentificationof15distinctgroupsofmineralogicalphases.ThesizedistributionofparticlescollectedonthefilterswasderivedfromtheSEMmicrographstakeninthebackscatteredelectronimagingmodeandanalyzedwithImageJfreeware.Thedeterminationofthemainmineralogicalgroupscomposingthebulksedimentassociatedwithphysicalparameterssuchasparticlesizedistributionoraspectratioallowsaprecisecharacterizationoftheloadoftheterrigenousparticlesinriversorlakes.InthecaseoftheAmazonianriversinvestigated,theresultsshowthattheidentifiedmineralogiesareconsistentwithpreviousstudiesaswellasbetweenthedifferentsamplescollected.Themethodenabledtheevolutionofgrainsizedistributionfromfinetocoarsematerialtobedescribedinthewatercolumn.Implicationsabouthydrodynamicsortingofmineralparticlesinthewatercolumnarealsobrieflydiscussed.Theproposedmethodappearswellsuitedforintensiveroutinemonitoringofsuspendedsedimentinriversystems.

简介：ThedinoflagellatecystassemblagesontheNanjiIslandintheEastChinaSea,aredocumentedatthefirsttimetoconstructaquantitativeoverviewofthecystbankfrom2014to2015.Thirty-fourmorphotypesfromsixgroupsareidentifiedandquantifiedateightsamplingsitesaroundtheisland,includingahighproportionofpotentiallytoxigenicspecies(14%).Autotrophicdinocystsconstitute74%ofthetotalcystcounts,whichisrelativelylow(twotothirty-threepermillilitresediment)comparedwithpreviousstudiesinadjacentareas.ScrippsiellatrochoideaandProtoperidiniumavellanaarethemostabundantautotrophicandheterotrophicspecies,respectively.Amultivariateanalysisisperformedtoassessassociationsbetweendinocystsandabioticorbioticvariables.Differentiationamongseasonsisevidentinthedetrendedcorrespondenceanalysis(DCA)ordinationplot,whileaspatialpatternisnotclearlyrevealeddespiteheterogeneityofthehydrodynamicconditionsbetweensamplingsites.Solublereactivephosphate,theratioofnitrogentophosphorusconcentrationsandKareniamikimotoibloomarethethreefactorssignificantly(P<0.05)relatedtosurfacesedimentcystassemblagedefinedbythecanonicalcorrespondenceanalysis(CCA),highlightingtheimportanceofnutrientregimetoadinocystdistributioninthisarea.AlthoughattemptstoaddresstheoriginofHABeventsinrecentyearsusingseedbankshavefailed,knowledgecanbevaluableforfurtherinvestigationofdinocystdynamicsandpotentialtoxinthreatsontheNanjiIsland.

简介：Soilsusceptibilitytodetachmentandtransportsub-processesoferosionisgenerallycontroledbytheaggregatebreakdownmechanism.Measuringparticlesizeandaggregationtotheestimateerodibilitypotentialofsoilsisimportantundererosiverainfallconditions.TheAggregateSizeDistribution(ASD)isoneofthemostimportantdeterminantsofsoilstructurealongwithsoilorganicmattercontentfordescribingtheefficiencyofapplied,sustainablemanagementstrategies.Thisstudyaimedtocomparetheperformancesofthreedifferentaggregatesizedistributionmodelstopredictthecharacteristicaggregatesizeparameter(mediandiameter,D50)forerodedsedimentfrominterrillerosionprocessesofRain-SplashTransport(RST)andRaindropImpactedFlowTransport(RIFT).TheASDsof1143collectedsedimentsamplesfromtheRSTandRIFTprocessesweremeasuredandmodeledbytheLog-normal,Fractal,andWeibullapproaches.TheD50value,asacharacteristicparameterforaggregatesizedistributions,derivedfromthecumulativeASDcurvewascomparedforsoilsfromdifferentlandusetypesanddifferentslopeandrainfallintensityconditions.TheperformanceofeachmodelwasevaluatedusingtheMeanSquareError(MSE)andCoefficientofDetermination(R^2).TheWeibullapproachwasthemostaccuratemodelshowingthebestfitwiththelowestMSEvalues(0.0002≤MSE≤0.0048)andhavingthegreatestR2values(0.936≤R^2≤0.998)whencomparedwiththeLog-normalandFractalmodels.Herewith,forsemi-aridlanduseandsoil,specificshapeandscaleparametersfortheWeibulldistribution,therespectiveASDsweresuccessfullyre-generatedformodelingtheerodedsedimentofthesimulatedRSTandRIFTinterillprocesses.

简介：AIM:Todeterminethedistributionsofcentralcornealthickness(CCT)andintraocularpressure(IOP)inemmetropiceyesofhealthychildrenofPalestine.METHODS:Thisrepresentativecrosssectionalstudyincludedatotalof1156eyesfrom578healthyschoolchildrenaged7-15y.Inclusioncriteriaincludedemmetropia,noprevioushistoryofocularorsystemicdiseases,noprevioushistoryofcontactlensuse,andtheavailabilityofbotheyes.CCTandIOPweremeasuredusingultrasoundpachymeterandGoldmannapplanationtonometer,respectively.Therelationshipoftheresultswithageandgenderwasinvestigated.RESULTS:Themeanageofschoolchildrenwas11.13±2.8y.MeanCCTwas542.2±37.4and544.3±39.2μmforrightandlefteyes,respectively.MeanIOPwas12.5±2.2and12.3±2.2mmHgforrightandlefteyes,respectively.ApositivecorrelationwasobservedbetweenCCTandIOPoftherighteye(P<0.001,R=0.358)andCCTandIOPofthelefteye(P<0.001,R=0.324).NosignificantdifferenceswereobservedinCCTandIOPduetoageorgender(P>0.05).ThereweresignificantdifferencesinmeanCCTandIOPbetweenrightandlefteyes(P=0.004,P=0.001,respectively).CONCLUSION:ApopulationprofileofCCTandIOPisestablishedinPalestinianchildrenforthefirsttime.MeanCCTiscomparabletosomestudiesbutdifferfromothers.MeanIOPisconsiderablylowerthanthatofmajoritychildrenofotherethnicgroups.Intereyedifferenceofmorethan36μminCCT,and5mmHginIOPshouldpromptevaluationforpotentialoculardisorders.