简介:Inthepaperthewaveattenuationinatwolayerfluidsystemisstudied.ThefluidinthetoplayerisidealandthatinthelowerlayeristheVoigtmodeloftheviscoelasticmedium.Adispersionrelationisderivedandtherateofthewavedecayiscomputed.Theapproximateexplicitexpressionsofthedecayratefordifferentwaterdeptharegiven,wheretheviscoelasticityiseitherverylargeorverysmall.Comparedwiththenumericalresults,ourresultsareveryaccurate,whichcanbeusedbyanengineer.
简介:Modernizationandmaintenanceofadamoftenrequireemptyingthereservoir,aprocessthatcancausemudbankinstabilitiesandenvironmentaldisturbances.Inordertoaddresstheproblemofmudbankcollapsecharacterization,astudyisconductedinpartnershipwiththeLaboratoireNationald'Hydraulique(LNH),asubsidiaryofElectricitédeFrance(EDF).Thispaperpresentsageotechnicalmodelingofsubmergedandemergentmudbankstabilityandacomparisonofthemodelresultswiththemeasurementscarriedoutthroughoutthewholereservoir.
简介:Organic-inorganicinteractionsoccurringinpetroleum-relatedmudvolcanoescanhelppredictthechemicalprocessesthatareresponsibleformethaneemissionstotheatmosphere.SevensamplesofmudbrecciadirectlyejectedfromonecraterwerecollectedintheDushanzimudvolcano,alongwithoneargillitesampleoftheoriginalreddishhostrocksdistalfromthecrater,forcomparisonpurposes.ThemineralandchemicalcompositionsaswellasironspeciesofallsamplesweredeterminedusingXRD,XRFandM?ssbauerspectroscopy,respectively.Theresultsindicatethataseriesofmarkedreactionsoccurredinthemudvolcanosystems,morespecificallyinthemudbrecciawhencomparedtotheoriginalrocks.Changesmainlyincluded:(1)someconversionofclaymineralsfromsmectiteintochloriteandillite,andtheprecipitationofsecondarycarbonatemineralssuchascalciteandsiderite;(2)silicondepletionandsignificantelementalenrichmentofiron,manganese,magnesium,calciumandphosphorus;and(3)transformationofironfromferricspeciesinhematiteandsmectiteintoferrousspeciesinsiderite,chloriteandillite.ThesegeochemicalreactionslikelyinducedthecolorchangesoftheoriginalreddishNeogeneargillitetothegrayorblackmudbreccia,asaresultofreductionofelementsand/oralterationofmineralsassociatedwiththeoxidationofhydrocarbons.Ourresultsalsosuggestthatgreenhousegasesemittedfromthemudvolcanoesareloweredthroughaseriesofmethaneoxidationreactionsandcarbonfixation(i.e.,throughcarbonateprecipitation).
简介:Twostatisticalmodelsoftheconcentrationofsuspendedsedimentonmudcoastshavebeendevelopedbyusingthestepwiseregressionmethod.ThestatisticalanalysisinthispaperisbasedonthefielddataofthemudcoastofLianyungang,China.Theregressionmodelsprovideanessentiallycompletestatisticaldescriptionoftheprocessesoffine-grainedsedimentonopenmudcoasts.
简介:Thetidalasymmetry-inducedsiltationbelowtidalbarriersisaworldwideproblemthatrestrictsregionalsocio-economicandenvironmentaldevelopment.Thehydrodynamicprocessesofthesmallmudestuaryalsofeatureahighuncertaintyafterestuaryrestorationmeasures.Inthisstudy,ahydrodynamicmodelbasedontheMIKE21isusedtoquantifytheresponsesoftidalasymmetrytoatwo-phaserestorationprojectinShuanglongEstuary,BohaiBay,China.Accordingtothenumericalmodelingresults,thetidalflatremovalintheupperestuary(first-phaserestoration)inducesthefloodasymmetryswitchingtotheebbasymmetryinunrestoredreachbutenhancesfloodasymmetryinwideningrestoredreach.Althoughthetidalasymmetryrevertstoflood-dominatedpatternafterfullrestorationovertheestuary,theimbalancebetweenfloodandebbvelocitiesisrelieved.Apossiblenetsedimenttransportpatternbasedonacomparisonofdominantasymmetriccurrentandactualsedimenttransportperiodshowsnetsedimentsintheupperestuaryandinlettransportseawardandlandward,respectively,inthefirst-phaserestoration,whereaslandwardnetsedimenttransportoccursinthewholeestuaryunderthesecond-phaserestorationscenario.Giventheseresults,weassumethataswitchfromtheflood-dominatedestuarytoebb-dominatedestuarycanbecausedbyredesigningthecross-sectionalprofile.ThequantitativecomparisonofLagrangianresidualcurrentsalsoimpliesthatachannel–shoalstructureratherthanaflatbathymetrycanpromotethemasstransport.Therefore,reshapingthechannel–tidalflatsysteminrestorationprojectscanpreventthesedimentationoftheestuaryandimprovethewaterenvironment.
简介:红泥是从氧化铝生产产生的粘性的苛性的残余。考虑钪的相对可观的内容和可获得性,红泥能被看作一个重要、有希望的钪资源而非稳固的浪费。这份报纸主要是包括酸的沥滤,溶剂抽取和离子交换基于最广泛地使用的hydrometallurgical过程从红泥考察钪恢复的调查吸附。从红泥的钪的恢复应该在全面程序表的发展被看作一个直接目的而非一个副产品,这被认为。以便与高钪恢复和低费用完成environmentally友好的过程,更多的注意被要求对优化到减少矿物质酸消费的钪的选择沥滤被给予并且减轻污染,并且为钪与高选择和识别开发新溶剂抽取系统和新奇离子交换吸附材料。
简介:Shinuilan形成的更低的志留纪泥墩,在南部的四川盆定位了,中国,比发生在这个区域的shallow-waterreef-bearing石灰石在更深的水里在开的架背景发展了。更低的志留纪的沉积相的边界和分发在南部的四川盆摇的露头,练习数据和同时期的差错控制了的地震侧面表演的集成。墩看起来在指责的synsedimentary形成的地志的lows发展了,在YangtzePlatform的架上。平均的墩厚度是20m,最大值35m。墩被页岩主要由micrite组成,微生物引起地可能跳了,并且被覆盖。墩顶是优先地dolomitized,与Mg~(2+),来源可能从墩顶的粘粒含量焦化。diagenetic历史的Microfaciesanalysis和重建表明墩顶有更高的孔,并且是煤气的目标;相反,墩核心和手足证明毛孔由方解石水泥的三代充满了,因此有一个低煤气的潜力。
简介:Thegeneticdiversityanddifferentiationof6mudcrabScyllaserratapopulationsfromsoutheasternChinaareinvestigatedusingallozymeelectrophoresis.Themeannumberofallelesperlocuspopulationis1.3±0.1;thepercentageofpolymorphiclociperpopulationis27.3;theobservedheterozygosityrangesfrom(0.195±0.083)to(0.241±0.090)andtheexpectedheterozygosityrangesfrom(0.105±0.043)to(0.131±0.047).Thecoefficientofgenedifferentiationamongpopulationsislow(Fst=0.032),indicatingthatonly3.2%ofthetotalgeneticdiversitycomesfrominter-population,whiletheremaining96.8%comesfromintra-populationdifferences.Thegeneticdistanceamongpopulationsis0.000~0.008(theaverageis0.002).Geneflowamongthepopulationsislarge(Nm=7.56).Geneticstructureisverysimilaramong6Scyllaserratapopulations.
简介:这份报纸由域调查,核心观察和SEM分析讨论生长阶段,空间结构,在各种各样的参数之中的量的适合关系,生长模式和泥裂缝的影响因素。学习显示出那:(1)泥裂缝生长能通过三个阶段,即syndiagenetic阶段,埋葬diagenetic阶段(包括早diagenetic舞台,中间迟了的diagenetic舞台)并且epidiagenetic阶段。(2)在各种各样的参数之中的量的适合关系允许大意义描述泥的环境击碎的空间结构,地区性的分发和生长。(3)泥裂缝生长有三个模型,例如包括线性生长模式,曲线的生长模式和分叉的单方的生长模型生长模式,包括intersectional生长模式的多边的生长模型,join生长模式和驱散的生长模式,并且包括任何模式的联合的混合生长模型上面列出了。(4)现代的泥裂缝生长通常经历四个阶段。在沙泥的沙床有韵律的阶层能在裂缝生长上起一个润滑作用并且为充满裂缝提供足够沙的存款。(5)泥裂缝生长通常生产主要是120t的分叉和分叉角度???諤吗??
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简介:ExtractingB2O3fromcalcinedboronmud(CBM)wasstudied.TheeffectoffactorssuchasreactiontemperatureandNaOH-to-CBMmassratioonB2O3extractionefficiencywasinvestigated.TheresultsshowthatincreasingreactiontemperatureandNaOH-to-CBMmassratioincreasesB2O3extractionefficiency.TherearetwostagesfortheB2O3extractingprocess:0–20ministhefirststage,whichisrapid;20–50ministhesecondstage,whichisslowerthanthefirststage.Theoverallextractingprocessfollowstheshrinkingcoremodel,andthefirstandsecondstagesaredeterminedtoobeythesurfacechemicalreactionmodelandthediffusionthroughtheproductslayermodel,respectively.Theactivationenergiesofthefirstandsecondstagesarecalculatedtobe41.74and15.43kJ·mol-1,respectively.TheB2O3extractingkineticsequationsofthefirstandsecondstagesarealsoobtained.