简介：Basedonstatisticsprinciple,randomerrorandsystematicerrorwereconsideredandthevolumetricpropertiesofthetwomixturestypes,namelyAandB,werestatisticallyanalyzedusingdifferentdistributionmethods.Seventy-twosamplesofmixtureAandfifty-twoofmixtureBwerefabricatedusingtheMarshallmethod.Theprobabilitydistributionswerecomparedonthebasisofgoodnessoffit.Weibullmodelwasfoundtobemostappropriatemodelfordescribingtheasphaltmixturesvolumetricpropertiesdistribution.Thetwo-parameterWeibulldistributionfunctionappliedwelltomodelthebulkspecificgravityandvoidsfilledwithasphaltdata,whereas,thethree-parameterWeibulldistributionappearedtobemoreappropriateinthediscussingofairvoidsandvoidsinmineralaggregate.Theexperimetalresultsisrevealedthatcomparedwiththemeanvalue,thepeakvalueofWeibulldistributionwassuggestedasanalternativeandmorepowerfulparameterfordescribingthetestdatadistributioncharacteristic.Theanalysisoftestresultsalsorevealedthatthereweresignificantdifferencesinthevolumetricpropertiesofthetwotestedmixturesforthesameconfidencelevel.Theconfidenceintervaldecreasedwiththedecreasinginreliability.

简介：Severalcriteriausedbyphysicisttoquantifytheratioofsignaltobackgroundarecompared.Theapproachfortakingintoaccounttheuncertaintyinestimationsofsignalandbackgroundisproposed.

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简介：Macroscopicanomaliesfrom"EarthquakeCasesinChina"arestatisticallyanalyzedinthispaper.Theconclusionisasfollows:Theprobabilityofoccurrenceofmacroscopicanomaliesbeforeearthquakesincreaseswithmagnitude.Thelargertheearthquakemagnitude,themoremacroscopicanomaliesappear.Thetemporaldistributionofmacroscopicanomaliesisasfollows:Therearefewmacroscopicanomaliesatbeginning;astimegoeson,thenumberofmacroscopicanomaliesincreases;theincreaseofmacroscopicanomalyquantityaccelerateswiththeimpendingearthquakeandreachesaclimaxwhentheearthquakebreaksout.Thespatialdistributionpatternofmacroscopicanomaliesisasfollows:macroscopicanomaliesappearattheepicenteratthebeginning,thenspreadout,andfinallyariseexplosivelyattheepicenterarea.

简介：Basedonstatisticalanalysis,thispaperstatesthatfourtypesofruralinfrastructureasroads,electrcity,communications,andeducationhavestatisticallysignificanteffectsonagriculturalproduction,nonagriculturalproduction,andfarmers'incomeinChina.However,thespecificsandthedegreesoftheseinfluencesaredifferent.Therefore,differentpolicieshavetobeimplementedrespectivelytomakefulluseofthelimitedfundsinChina.Meanwhile,thematuritylevelofruralinfrastructureaswithruraleconomicdevelopmenthasregionaldiscrepancy.Thelevelsofmaturitydecreasefromeasttowest.itisurgentthatthecurrentweaksituationoftheruralInfrastructureinwesternChinaneedstobeimproved.

简介：Withamultiplicativespecklemodel,thispapershowsthemulti-lookpolarimetricsyntheticapertureradar(SAR)dataobeysageneralizedK-distribution.Tovalidatethisdistributionmodel,themulti-lookintensityK-distributionisparticularlytested.Therelationshipbetweentheheterogeneitycoefficientofthesceneandtheproperstatisticalmodelisexperimentallyestablished.Inaddition,basedontheresultsofthestatisticalanalysis,anadaptiveclassificationschemeispresented,andtheimprovedclassificationshowstheimportanceofthestatisticalanalysis.

简介：Inthepresentstudy,theformulacalculatingshipimpactforcesonlightwharfstructuresispresentedwhentheelasticdeformationofthehullandthepierstructuresaswellasthenonlineardeformationofthefenderaretakenintoaccount.TheshipimpactforcesarestatisticallyanalyzedwiththeMonte-Carlomethodaccordingtotheknownprobabilitydistributiontypesofrandomvariables.Basedonthesimulatedresults,thedistributionofshipimpactforceswhichischaracterizedbybimodaldistributioncanbeexpressedasthecombiningprobabilitydensityfunctionofbetadistributionandnormaldistribution.Thecorrespondingparametersoftheprobabilitydensityfunctioncanbeestimatedwiththemaximumlikelihoodmethod.TheresultsshowthatshipimpactforcesonlightwharfstructuresfollowthedistributionoftypeIextremevalue.Themeancoefficientandvariationcoefficientare1.11and0.008respectivelyduring50yearsofdesignreferenceperiod.

简介：Accordingtothecharacteristicsofsodarecho,aclassifiedmethodfortemperaturestratificationisgiven.ByusingsodardataobservedinYanshanMountainareainBeijing,thestatisticalcharacteristicsfortheheightofinversionlayer,thermalplume,andthedepthofmixedlayerarecompared.Finally,theappearancefrequencyforstable,unstableandneutralstratificationisanalyzed.

简介：Accordingtotheresultsofsiteseismichazardanalysisaccomplishedinthepastdecades,96site-relateddesignspectraareselectedassamplesinthisstudy.Theresultshowsthatthevalueofthecornerperiod(Tg)ofthedesignspectruminGBJ11-89(ChinaSeismicBuildingCode,issuedin1989)islowerthanthevalueobtainedbysiteseismichazardanalysis.ThesamesituationexistswhenwecomparethedesignspectraoftheCodestothespectraaccordingtotheearthquakerecords.Thevalueincurrentseismicdesigncode,GBJ50011-2001issuedin2001,isgreaterthanthatinGBJ11-89,butstilllessthanthevalueobtainedbysiteseismichazardanalysis.Ifweacceptthevaluegotbysiteseismichazardanalysis,wehaveasuspicionthat2/3ofbuildingsbuiltaccordingtoGBJ11-89willnotbesafewhenanearthquakewith2%probabilityofexceedancein50yearsoccurs.

简介：Atmosphericconcentrationsofpolycyclicaromatichydrocarbons(PAHs)weremeasuredduringvariousseasonsatsixdifferentcities/locationsinQingdaoalongshore.TheannualaveragePAHsconcentrationrangedfrom16ng/m3(atacleancom-paredsite)to308ng/m3(inanindustrysite).TheaveragetotalparticulatePAHsconcentrationwas74.5ng/m3withahigherconcentrationofparticulatePAHsinwinter.Basedonayear-rounddataset,thesourcesofPAHsintheairofQingdaoweredrawnbyprincipalfactoranalysisandcorrelationanalysis.TheresultsindicatedthatvehicleemissionsandoilburningwerethemainsourceofPAHsinQingdaoalongshore.

简介：AstatisticalanalysisoftectonicenvironmentforM≥6.0strongearthquakesinChina'scontinentsincethebeginningofrecordedhistoryisperformedbasedonthedataofactivefaultsstudiedduringlast10yearsandresultofcompilationofthefourthversionoftheMapofSeismicRegionalizationofChinaforEarthquakeProtection.Tectonictypesofseismicsourcesofstrongearthquakesinallseismicregionsandthemovementmodesofseismogenicstructuresarediscussed.Meanwhile,ananalysisoflengthsofsurfacerupturezonesproducedbyalltypesofearthquakes,orientationsoflongaxesofmeizoseismalareas,regionaltectonicstressfieldsinseismicsourceregionsforstrongearthquakes,geophysicalfields(gravityanomaly,highconductivitylayeranomaly,andterrestrialheatflowdensity),andrecentverticalcrustaldeformationfieldshavebeencarriedout.

简介：ThispaperisrelatedtostudyoftheiondensityrecordedbythelowaltitudesatelliteDEMETER.Itwillpresentionosphericperturbationsobservedduringlargeseismicevents.Astheionosphereishighlyvariable,thepaperwillshowastatisticalanalysisperformedontheplasmaparametersduringnighttime.Analgorithmhasbeenimplementedtodetectcrestsandtroughsinthedatabeforeworld-wideearthquakes.Theearthquakeshavebeenclassifieddependingontheirmagnitude,depth,andlocation(land,belowthesea,closetoacoast).Duetotheorbit,DEMETERreturnsabovethesameareaeveryday(onceduringdaytime,onceduringnighttime)butnotatthesamedistanceofagivenepicenter.Then,foreachearthquake,datahavebeencheckeduntil15daysbeforetheshockwhenthedistancebetweenthetraceoftheorbitandtheepicenterislessthan1500km.Theresultsofthestatisticalanalysisarepresentedasfunctionsofvariousparameters.Acomparisonisdonewithtwootherdatabaseswhere,ononehand,thelocationoftheepicentershasbeenrandomlymodified,andontheotherhand,thelongitudeoftheepicentershasbeenshifted.Resultsshowthatthenumberandtheintensityoftheionosphericperturbationsarelargerpriortoearthquakesthanpriortorandomevents,andthattheperturbationsincreasewiththemagnitude.

简介：AstatisticalanalysisontheWenchuanaftershockactivitytriggeredbytidalforcesissystematicallystudiedbasedonSchusterstest,includingearthquakestriggeredbytidalforce,tidalstressandtidalcoulombfailurestress.TheresultsshowthatagroupofstrongaftershockswhichoccurredattheendofJulytoearlyAugustin2008atthenorthofWenchuanwereobviouslytriggeredbyearthtide,thesameconclusionisdrawnbySchusterssmoothtestofthetidalforce,tidalstressandtidalcoulombfailurestress.Inaddition,theWenchuanaftershockactivityisobviouslytriggeredbyfortnighttide.Inthenorth,theaftershockshappenedmorefrequentlyinthefirstandlastquartersofthemoon,andinthesouth,theaftershockshappenedmorefrequentlyinthefirstandlastquartersofthemoonandduringthefullmoon.

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简介：Insulatorsonhigh-voltageUansmissionlinesarealmosttheonlyman-madestructuresontheEarth'ssurfaceintendedforlong-termoperationunderstrongelectricfields.AftersamplesofnaturalcontaminantparticleswerecollectedfrominsulatorsurfacesinChina,itwasfoundthattheparticlediameterdistribution(PDD)wasmainlyconcentratedinthe5-50μmrange.Toanalyzethestatisticalcharacteristicsoftheseparticles,thisworkstudiesthephysicalprocessesofparticlecollisionandadhesionusingthetheoriesofhydrodynamicsandcollisiondynamics.Thephysicalmodelconsiderscouplingofthefluidfieldandtheelectricfield,introducesanadhesioncriterion,andestablishesaparticleandsurfacecollisionmodel.Theeffectsofrelativehumidity,windspeed,aerodynamicshape,electricfieldtype,andelectricfieldstrengthonparticleadhesionwereanalyzed.Theresultsshowthattherelativehumidityandwindspeedhaveverysignificanteffectsandtheinfluencesoftheelectricfieldtypeandtheelectricfieldstrengthareobvious,buttheinfluenceoftheaerodynamicshapeisrelativelyweak.Thesimulationresultssupportthestatisticalcharacteristicsdeterminedinthiswork.Thephysicalmodelestablishedhereprovidesreferencevaluesforstudyoftheadhesioncharacteristicsofparticlesonsurfacesunderelectricfields.

简介：AstatisticalanalysisonearthquakeactivityintheKashi-WuqiaintersectionareatriggeredbyearthtideisdonebySchusterstestandthePermutationtestondailyandmonthlyscales.Thenorth-south,east-westcomponentofthetidalforceandtidalbodystressarechosenasthetidalcurveinthedailyscale.Theresultsshowthatmostoftheearthquakesoccurrednearthemaximum0°ofthethreekindsoftidalcurves,thepredominanttidalphasesoftheearthquakeare-5.86°,6.60°and-15.52°,andthefrequencyoftheearthquakesincreaseswiththeincreaseofthetide;withthreekindsoftidalcurves(thenorth-south,east-westcomponentofthetidalforceandtidalbodystress),thepSofSchusterstestforalltheearthquakesis10.52%,2.40%and2.06%,andthepPofthePermutationtestis10.90%,2.40%and2.06%,andtheresultsofpSandpPbasedontheeast-westcomponentofthetidalforceandtidalbodystressarebelowthethresholdof0.05thattidaltriggeringofearthquakes.Inthemonthlyscale,boththepSandpPareverylow(closeto0),farbelowthethresholdof0.05oftidaltriggeringofearthquakes,andthepredominanttidalphaseforearthquaketriggeringis-18.95°,closetothemaximum0°(newmoonandfullmoon)oftheearthtideinmonthlyscale.Regardingthestatisticaltestresultoftidaltriggeringofearthquakes,apreliminaryexplanationisgivenastowhythetriggereffectintheeast-westdirectionisgreaterthanthatinnorth-southdirection.

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简介：基于recombinantDNA技术，现代生物工学使为庄稼改进与大潜力介绍新特点可能。然而，关于基因转变的非计划中的效果担心可能威胁环境或消费者健康说服了科学家在遗传上修改的有机体上建立预映测试。对与安全使用的历史与比较仪由遗传上修改的有机体的比较建立了的‘substantialequivalence'概念的评价能是一个全面风险评价的第一步。代谢物水平富于源自基因或环境的因素的变化的性能。因为对所有代谢物的评价详细很昂贵、实际上不可能，谷物的处理数据的统计评估分光镜的值能为复杂化学分析是一时间和合算的替换。调查能力多变量在象与可得到的工具为如此的比较测试一个方法一样的metabolomes的比较的统计技术，在与它的传统地引起的父母一起的联合的转基因的米饭被用作测试材料，并且判别式分析是在从Fourier变换被提取的处理数据上作为无指导的分类方法监督了方法和主要部件分析被使用红外线的光谱学和原子磁性的回声光谱粉状的米饭和米饭抽取和大麦谷物的数据取样，哪个后者被看作控制。结果证实了统计的能力，甚至与处理在metabolome研究的应用程序的起始的数据。同时，这研究证实监督方法导致更特殊的结果。

简介：Wehavepreviouslydevelopedacombinedsignal/variancedistributionmodelthataccountsfortheparticularstatisticalpropertiesofdatasetsgeneratedontheAp-pliedBiosystemsAB1700transcriptomesystem.Hereweshowthatthismodelcanbeefficientlyusedtogeneratesyntheticdatasetswithstatisticalpropertiesvirtu-allyidenticaltothoseoftheactualdatabyaidoftheJAVAapplicationace.mapcreator1.0thatwehavedeveloped.ThefundamentallydifferentstructureofAB1700transcriptomeprofilesrequiresre-evaluation,adaptation,orevenrede-velopmentofmanyofthestandardmicroarrayanalysismethodsinordertoavoidmisinterpretationofthedataontheonehand,andtodrawfullbenefitfromtheirincreasedspecificityandsensitivityontheotherhand.Ourcompositedatamodelandtheace.mapcreator1.0applicationtherebynotonlypresentproofofthecor-rectnessofourparameterestimation,butalsoprovideatoolforthegenerationofsynthetictestdatathatwillbeusefulforfurtherdevelopmentandtestingofanalysismethods.