简介:Thesimilaritytransformationmodelbetweendifferentcoordinatesystemsisnotaccurateenoughtodescribethediscrepancyofthem.Therefore,thecoordinatetransformationfromthecoordinateframewithpooraccuracytothatwithhighaccuracycannotguaranteeahighprecisionoftransformation.Inthispaper,acombinedmethodofsimilaritytransformationandregressiveapproximatingispresented.Thelocalerroraccumulationanddistortionaretakenintoconsiderationandtheprecisionofcoordinatesystemisimprovedbyusingtherecommendedmethod.
简介:ObjectiveDespitethefactthatthebioavailabilityoftracemetalsindicatedbytheirspeciationhasbeenanindispensableparameterintheassessmentandtreatmentoftheenvironmentalpollutionoftracemetals,manystudieshavesuggestedthatthebioavailabilityoftracemetalsmaychangeaccordingtotheconditionsoftheenvironment,
简介:这份报纸考虑在一个温和斜坡(1:40)上宣传的不规则的波浪的非线性的转变。不规则的波浪的二个盒子,机械地基于JONSWAP系列被产生,被用于这个目的。结果显示波浪高度服从瑞利分发在近海地点;在变浅的区域,然而,最大的波浪的高度被理论分布低估。在波浪地区,波浪高度能被合成Weibull分发接近。另外,在不规则的波浪以内联合的非线性的阶段被基于小浪的bicoherence调查。bicoherence系列思考参予联合的阶段的频率模式的数字与减少的水深度增加,,,这做阶段联合的度。在早期的碎以后,尽管阶段联合的度减少,很多更高的泛音波浪模式也涉及非线性的相互作用。而且,加的bicoherence显示与最强壮的本地非线性的相互作用有关的频率模式与减少的水深度变到更高的泛音。
简介:Thispaperextendsapredictionmodelformulti-directionalrandomwavetransformationbasedonanenergybalanceequationbyMasewiththeconsiderationofwaveshoaling,refraction,diffraction,reflectionandbreaking.Thisnumericalmodelisimprovedby1)introducingWen'sfrequencyspectrumandMitsuyasu'sdirectionalfunction,whicharemoresuitabletothecoastalareaofChina;2)consideringenergydissipationcausedbybottomfriction,whichensuresmoreaccurateresultsforlarge-scaleandshallowwaterareas;3)takingintoaccountanon-lineardispersionrelation.PredictionsusingtheextendedwavemodelarecarriedouttostudythefeasibilityofconstructingtheAiHuayachtportinQingdao,China,withacomparisonbetweentwoportlayoutsindesign.Wavefieldsinsidetheportfordifferentincidentwavedirections,waterlevelsandreturnperiodsaresimulated,andthentwokindsofparametersarecalculatedtoevaluatethewaveconditionsforthetwolayouts.AnalysesshowthatLayoutIisbetterthanLayoutII.Calculationresultsalsoshowthattheharborwillbecalmfordifferentwavedirectionsunderthedesignwaterlevel.Onthecontrary,thewaveconditionsdonotwhollymeettherequirementsofayachtportforshipberthingundertheextremewaterlevel.Forsafetyconsideration,theelevationofthebreakwatermightneedtobeproperlyincreasedtopreventwaveovertoppingundersuchwaterlevel.Theextendednumericalsimulationmodelmayprovideaneffectiveapproachtocomputingwaveheightsinaharbor.
简介:ThispaperfocusesontheintegrationanddatatransformationbetweenGPSandtotalstation.ItemphasizesonthewaytotransfertheWGS84Cartesiancoordinatestothelocaltwo-dimensionalplanecoordinatesandtheorthometricheightGPSreceiver,totalstation,radio,notebookcomputerandthecorrespondingsoftwareworktogethertoformanewsurveyingsystem,thesuper-totalstationpositioningsystem(SPS)andanewsurveyingmodelforterrestrialsurveying.Withthehelpofthissystem,thepositionsofdetailpointscanbemeasured.
简介:基于管理方程和相等的模型,我们建议在一架飞机之间的关系与放射状地不同类的性质在球状的几何学在一个维的媒介和一个球形的波浪挥动的相等的转变。这些相等的关系能帮助我们在不同类的媒介获得elastodynamic问题的分析答案。介绍相等的转变的物理本质是在几何学和材料性质之间的相等的关系。它显示在球状的几何学的球形的波浪问题能与可变性质域在工具条中被转变成飞机波浪问题,并且它的反的转变也是有效的。在不同类的媒介的波浪运动问题的四个不同例子基于介绍相等的关系被解决。我们在例子获得二张基本分析答案表格我和II,在例子III,和展览调查不同类的一半空间的思考行为在例子IV的一个特殊不同类,它能在经常的振幅把旅行作为球形的波浪。这研究暗示我们的想法成为解决联系问题更容易。
简介:Haze-to-fogtransformationduringalonglasting,lowvisibilityepisodewasexaminedusingtheobservationsfromacomprehensivefieldcampaignconductedinNanjing,Chinaduring4-9December2013.Inthisepisode,hazewastransformedintofogandthefoglastedfordozensofhours.Theimpactsofmeteorologicalfactorssuchaswind,temperature(T)andrelativehumidity(RH)onhaze,transitionandfogduringthisepisodewereinvestigated.Resultsrevealedsignificantdifferencesbetweenhazeandfogdays,duetotheirdifferentformationmechanisms.Comparisonwasmadeforboundary-layerconditionsduringhazydays,haze-to-fogdaysandfoggydays.DistributionsofwindspeedandwinddirectionaswellassynopticweatherconditionsaroundNanjinghaddeterminativeimpactsontheoccurrencesandcharacteristicsofhazeandfog.WeakenedsoutherlywindinsouthernNanjingresultedinhighconcentrationofpollutants,andhazeeventsoccurredfrequentlyduringthestudyperiod.Thewindspeedwaslessthan1ms-1inthehazeevent,whichresultedinastableatmosphericconditionandweakdispersionofthepollutants.Theheightofthetemperatureinversionwasabout400mduringtheperiod.Theinversionintensitywasweakandthetemperature-differencewas4℃km-1orlessinhaze,whiletheinversionwasstronger,andtemperature-differencewasabout6℃km-1,approachingtheinversionlayerintensityinthefogevent.HazeeventisstronglyinfluencedbyambientRH.RHvaluesincreased,whichresultedinhazedaysevidentlyincreased,suggestingthatanincreasingfractionofhazeeventsbecausedbyhygroscopicgrowthofaerosols,ratherthansimplybyhighaerosolloading.WhenRHwasabove90%,hazeaerosolsstartedtobetransformedfromhazetofog.Thisstudycallsformoreeffortstocontrolemissionstopreventhazeeventsintheregion.
简介:Thispapercalculatestheparametersofimagepositionandorientation,proposesamathematicalmodelandadoptsanewmethodwiththreestepsoftransformationsbasedonparallelrayprojection.Everystepofthemodelisstrict,andthemapfunctionofeachtransformationisthefirstorderpolynomialsandothersimplefunction.Thefinalcalculationoftheparametersisforthelinearequationswithgoodstatus.Asaresult,theproblemoftherelativityofimageparametercalculationissolvedcompletely.Someexperimentsarecarriedout.
简介:Adetaileddiscussionofexistingthreekindsofmathematicalmodelsofheavymetalpollutanttransport-transformationinfluvialriversispresented,withanemphasisonthemathematicalmodelofheavymetalpollutanttransport-transformationdynamics.Theimperfectionoftwokindsofmathematicalmodels,thatis,mathematicalmodelofchemicalthermodynamicequilibriumandthatofchemicalreactionkinetics,andtheshortcomingofexistingmathematicalmodelsofheavymetalpollutanttransport-transformationdynamicsarepointedout.Furthermore,thestructureofmathematicalmodelofheavymetalpollutanttransport-transformationdynamicsinfluvialriversissuggested.Equationsinthemathematicalmodelofheavymetalpollutanttransport-transformationdynamicsinfluvialriverswillbediscussedinthefollowingpaper.
简介:AuthorshavestudiedthetransformationprocessesofcoldairoverlandinEastAsiaforeightcaseswhichoccurredindifferentmonthsof1981.First,thesurfaceeddysensibleandlatentheatfluxes,anddragcoefficientwereestimatedaccordingtotheapproachofsimilaritytheory.Then,theapparentheatsource,theapparentmoisturesink,andsolarandlong-waveradiativeheating(orcooling)werefurthercalculatedthroughthebudgetmethodandphysicalparameterizationalgorithm.Ithasbeenfoundthatthecoldairimmediatelystartsthetransformationprocessoverlandonceitmovesawayfromitsregionoforigin.Inwinter,thedegreeoftransformationofcoldairmassgraduallyintensi-fiedasittravelledsoutheastward;whilearrivingintheocean,thecoldairmassunderwentthemostsignificanttransfor-mationprocess.Insummer,themostvigoroustransformationofthermalandmoisturefieldswasobservedinNorthChinaandMongolianregion,withmuchgreaterintensitythanthatinwinter.