简介:Thispaperdealswithasimulatedtestofbiogenicmineralizationmadewithablue-greenalgaspecies,Spirulinaplatensix.Thedataintheexperimentwererecordedbyacomputerizedsurveyingsystem.Theinflu-enceofalgaeontheaccumulationofphosphorusbychangingtheirmicroenvironmenttopromotetheforma-tionanddepositionofphosphatewasstudied.TheresultsshowthatthepHvalueofculturalliquorroseupto10andtheredoxpotential(Eh)maydropby100-200mVduringthealgallogarithmicgrowthstage,andthecultrualliquorwaschangedintoamediumwithaweaklyreducingcondition.AttheendofthelogarithmicgrowthstagewhitedepositsofNa2Ca(CO3)2·5H2OandCa2Mg(PO4)2·2H2Owereformedonthefloorofculturalcontainers.Thetestpresentedawduableevidenceforthetheoryofbiogenicmineralization.
简介:Aprimitiveequationmodelwithazonaldomainandap-σincorporatedverticalcoordinatesystemisusedtostudytheeffectsoftheenvelopedegreeoforographyonthesimulatedpropertiesofbothwinterandsummerclimates.Resultsshowthattheorographywithalargerenvelopedegreecanim-provethesimulationstocertainextent,especiallyinwinter.Itisfoundthatthesimulatedpropertiesofclimatearemainlydeterminedbytheco-effectsoftheland-seaandtheorographicdistributions,andtheenvelopedegreeoforographyhasasecondaryeffect.Howeveritshouldbetakenproperlyinordertoimprovesimulations:otherwise,itwouldbeharmful.Differentenvelopedegreesoforogra-phycanbeadoptedindifferentareas.
简介:MgAl//2O//4在模仿的身体液体(SBF)提高的Ca/P陶艺的行为被学习。结果显示出那,Ca/P合成陶艺的表面上的生物磷灰石罐头precipitate然而,Ca/P合成陶艺的表面的溶解也由于在提高的温度与Ca/P陶艺通过MgAl//2O//4的反应被生产的一种非结晶的材料发生;因此,在SBF的Ca/P合成陶艺的行为主要取决于那些二个过程。那些二的联合影响的分析处理MgAl//2O//4的低内容赞成的表演因此,生物磷灰石的形成引起更高的简历活动。(编辑作者摘要)23个裁判员。
简介:Two-dimensionalirregularpolygonspackingproblemisverydifficulttobesolvedintraditionaloptimalway.Simulatedannealing(SA)algorithmisastochasticoptimizationtechniquethatcanbeusedtosolvepackingproblems.ThewholeprocessofSAisintroducedfirstlyinthispaper.AnextendedneighborhoodsearchingmethodinSAismainlyanalyzed.AgeneralmoduleofSAalgorithmisgivenandusedtolayouttheirregularpolygons.Thejudgmentofintersectionandotherconstrainsofirregularpolygonsareanalyzed.ThenanexamplethatwasusedinthepaperofStefanJakobsislisted.ResultsshowthatthisSAalgorithmshortensthecomputationtimeandimprovesthesolution.
简介:TheGoda'smethodofseparatingthefrequencyspectrumoftheunidirectionalincidentandreflectedwavesisimproved.Theproposedmethodcanbeappliedtotheseparationofobliqueincidentandreflectedwavesandthetwowavegaugescanbearrangedinanarbitraryangleinfrontofastructure.Whentheprojecteddistanceofthetwoprobesontheincidentwavedirectionisthemultipleofthehalflengthoftheincidentwaves,thesingularproblemwillemergebyusingthemethod.Itisadvisedthatwhentheprojecteddistanceofthetwomeasuredpointsontheincidentwavedirectionis0.05~0.45timesthewavelengthofpeakfrequencywave,goodresultscanbeobtained.Thesimulatedresultantwavesareseparatedbythemethodofnumericalsimulationandtheseparatedwavespectraarebasicallycorrespondingtothetargetspectrainput.Thewavetrainscalculatedbytheseparatedincidentandreflectedwavefrequencyspectrumareapproximatedtotheinputwavetrainsandthereflectedcoefficientcanbederivedcorrectly.Therefore,themethodproposedinthispaperisreliable.
简介:DuringthecrystalgrownbyVBM,thesolid/liquidinterfaceconfigurationsgreatlyinfluencethequalityofas-growncrystals.Inthispaper,finiteelementmethod(FEM)wasusedtosimulatethegrowthprocessofCdZnTecrystal.Theeffectsofdifferentcruciblemovingratesandtemperaturegradientofadiabaticzoneoncrystalgrowthrateandsolid-liquidinterfaceonfigurationwerestudiedaswell.Simulationresultsshowthatwhencruciblemovesattherateofabout1mm/h,whichisnearlyequaltocrystalgrowthrate,nearlyflatsolid/liquidinterfaceandlittlevariationofaxialtemperaturegradientnearitcanbeattained,whicharewellconsistentwiththeresultsofexperiments.CdZnTecrystalwithlowdislocationdensitycanbebtainedbyemployingappropriatecruciblemovingrateduringthecrystalgrowthprocess.
简介:TheNCARcommunityclimatemodelwasrunfor20yearsandthesimulatedEastAsianclimatewasanalyzedandcheckedagainsttheobservationdata.Itisfoundthatthelarge-scalefeaturesoftheEastAsiaclimateweresimulatedprettywellbythemodel,thoughtherearestillsomediscrepanciesbetweenthemodeloutputandtheobservation.Thesimulatedgeopotentialheight,windandtemperaturefieldsareveryclosetotheobservations.Thelargescalesystemssuchassubtropicalhigh.Mongoliahigh,IndianlowwhichhaveimportantinfluenceontheEastAsiamonsoonalsosimulatedprettywell.Itisalsofoundthatthemoisturefieldisnotsimulatedsowellasthosefieldsmentionedabove.Thesimulatedprecipitationisratherdifferentfromtheobservations.ThesesuggestthatsomephysicalprocessesintheCCM2needtobeimproved.
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简介:Comparativeexperimentswithandwithoutthediurnalchangeofsolarradiationaremadeinthispaperbyuseofanair-seacoupled7-layerprimitiveequationmodelingsysteminazonaldomainbetween60°Sand60°N.Theresultsshowthatthequasi-stationarypatternsofthemeanmonsooncirculationsarenotevidentlyaffectedbythediurnalchangeofsolarradiation.Themaininfluencesmaycomefromtheland-seadistributionandtheorography.However,theinclusionofthediurnalchangeofsolarradiationintothemodelsystemmayimprovetheintensitiesofthesimulatedmonsooncirculationsbothatthehighandthelowlevels.Itcaninfluencethedistributivepatternofprecipitationtoalargerextent.Withoutthediurnalchange,precipitationintheinterioroflandwoulddecreaseandinthecoastalregionsitwouldincrease.Thechangesofthesoiltemperatureandthesoilmoisturearefairlycorrespondenttothatofprecipitation.Theareaswithincreasingprecipitationandtheareaswithdecreasingprecipitationaredistributedinthewaveform.Astotheinfluencesonthemonsoondevelopment,theresultsindicatethatthediurnalchangeofsolarradiationcanspeedupthedevelopmentofthemonsoonintheearlystage.Therefore,theinclusionofthediurnalchangeofsolarradiationcanmakethemodelequilibriumstatetoreachearlier.
简介:Aunifieddamageandfracturemodel,thecombinatoryworkdensitymodel,whichissuitableforei-thernon-crackedbodyorcrackedbodyhasbeensuggested.Inthepresentpaper,thedeformationandfractureofthetwokindsoftensilespceimenandTPBspecimenmadeof40Crsteelhavebeensimulatedbyusingthenewmod-eltogetherwiththelargeèlastic-plasticdeformationfiniteelementmethod.Theresultsgiveagoodpictureofthewholedeformationandfractureprocessesofthespecimensinexperiments;especially,theresultsontheTPBspecimencanbeusedtoobtaintherelationshipbetweenloadanddisplacementattheloadingpointP-Δ,andbetweencrackex-tensionanddisplacementattheloadingpointΔα-Δ,theresistancecurveJR-ΔaandthefracturetoughnessJIC.Alltheresultsareinremarkableagreementwiththoseobtainedbyexperiments.Thereforethemodelsuggestedherecanbeusedtosimulatecrackinitiationandpropagationinnon-crackedbodyandfractureinitiationandcrackstablepropa-gationincrackedbody.
简介:模仿的austempered的一张连续冷却转变(CCT)图可锻的铁(ADI)焊接金属借助于Formastor-F图测量仪器被开发了,并且由与实际焊接作比较修订了。最后,修订的图被用来决定焊接技术。(编辑作者摘要)4个裁判员。
简介:Theeffectsofsimulatedacidrainretainedinsoilonthepropertiesofacidsoilanditsdiminishingbyapplicationofgroundphosphaterockwereinvestigatedbyusingthesorptionmethod.Resultsshowasfollows:(1)Foryellowbrownsoil,theeffectofsimulatedacidrainonthepropertiesofsoilwithapHvalueof5.9wasrelativelysmall,exceptagreatquantityofacidraindepositedonit.(2)forredsoil,theeffectofsimulatedacidrainonthepropertiesofsoilwassignificant.Withtheincreaseoftheamountofaciddeposition,thepHvalueofsoilwasdeclined,butthecontentsofexchangeableH^+,Al^3+andMn^2+andtheamountofSO4^1-retentionwereincreased.(3)Manypropertiesofacidsoilscouldbeimprovedbyapplyinggroundphosphaterock.Forexample,pHvalueofsoilsandtheamountsofavailablePandexchangeableCa^2+andMg^2+wereincreased,andtheamountsofexchangeableH^+andAl^3+andSO4^2-retainedwasreduced.Theapplicationofgroundposphaterockcouldeffctivelydiminishthepollutionofacidraintosoil.
简介:Theatmosphericgeneralcirculationmodelcoupledtothemixedlayeroceanmodelhasbeenusedtosimulatethechangesoftheglobalsoilmoisture.Comparingthesimulatedresultswithobservations,itisshownthatthemodelisca-pableofdoingsensitiveexperimentsaboutthecarbondioxidechange.The2×CO2/1×CO2comparisonshowsthattherearetheobviouschangesofthesoilmoistureintheglobalforfourseasons.Therearethewetsoilmoistureinthelowerlatitudesofbothhemispheresanddrysoilmoistureinthemid-dlelatitudesofbothhemispheresforfourseasons.Thedrysoilmoistureinsummerandwetinotherseasonsarefoundinthenorthernhigherlatitudes.TheanalysesofthephysicalfeedbacksresponsiblefortheCO2-inducedchangesofsoilmoistureshowthatthebud-getsofthesurfacewaterandheataretheimportantfactors.