简介：StudyontheavoidanceresponseofPenaeuschinensistoheavymetals(Pb,Cr,Zn)andheavymetalmixtures(Pb-Cr,Pb-Zn)iscarredoutusingaY-modelavoidanceapparatus.Theconcentrationscalculatedtoinduce50%avoidanceratebyPenaeuschinensisare11.4,33.2and238.1mg/LforPb,CrandZn,respectively.MixturesofPb-CrandPb-ZnproduceadditiveeffectintheavoidancetestusingPenaeuschinesis.ButwhenthemixedPb-Znsolutionhas0.5toxicunitPband0.5toxicunitZn,themixtureseemstohavesynergisticeffect.

简介：Thesuper-largePb-ZndepositatFankouisverycomplexinmetallogenicmechanism.Syngeneticbrinesedimentation,hotsubmarinespringeruption-accumulation,syngeneticsedimentation-vadosebrinereplacementhadbeensupposedasthegeneticmodelsbefore.Underthesemodels,syngeneticmineralizationshouldbedominantinoreformation.However,aseriesofgeologicalandgeochemicalpropertiesinvestigatedbyauthorsofthispaperarecontrarytothesemodels.Therefore,theauthorsheresuggestthatthisdepositisatypicalpolygeneticcompoundoredepositwhichsharethepropertiesofmultistagesofgeotectonicevolution,multifactorsofmineralizationcontrol,multisystemofmaterialderivationofmineralization,multimodesofmineralizationandmultitypesofgenesis.

简介：这篇论文在Guiyang的地表的土壤描述象Cu和Zn那样的重金属污染物质的环境联盟者geochemical特征，GuizhouProvince的首都的城市。在土壤和geochemical标准的重金属的基线集中被建立了在环境上区分自然或人工的影响。用统计上分析方法，我们在Guiyang(18.8mg/kg)建立了Cu的基线，土壤(超过68.4mg/kg)可以承受Cu污染。Zn的数据是46。3mg/kg并且112。0mg/kg。Geoaccumulation指数分析显示有sufferednon污染到的地表的土壤为38%，38%，和22%的Cu帐户为中间污染中间污染，并且仅仅对严重污染中间污染的2%between。承受了Zn的非污染tomid污染的地表的土壤占41%，50%，和7%为中间污染，并且仅仅2%betweenmid污染到严重污染。Cu污染的最大的度在Guiyang的surficials油是5.09。没为53承受Cu污染报道的地表的土壤。2%。Cu的全部的污染度是稍微超过零。Guiyang的地表的土壤因此承受了slightCu污染。Zn污染度的最大的价值是2。85在地表的土壤ofGuiyang。77。8%地表的土壤还没承受了任何Zn污染。Zn的全部的污染度是不到零。在Guiyang的地表的土壤因此从Zn的污染是免费的。

简介：Tianqiaocarbonate-hostedPb-Zndeposit,controlledbyNW-trendingF37thrustfaultandNW-trendingTianqiaoanticline,islocatedintheeasternpartofSichuan-Yunnan-Guizhou(SYG)Pb-Znmetallogenicprovince,southwesternYangtzeBlock,southwestChina.OrebodiesinthisdepositarehostedintheDevonian-Carboniferouscarbonaterocks,andoremineralsincludesphalerite,galenaandpyrite,whiletheganguemineralsaredominatedbycalciteanddolomite.Usinghigh–precisionsolidthermalionizationmassspectrometry(TIMS),thispaperreportsthestrontiumisotopiccompositions(0.7119to0.7167)ofsulfidesamplesfromtheTianqiaodepositinordertotracetheoriginofhydrothermalfluids.Comparedwiththecountryrocks,thecalculated87Sr/86Sr200Mavaluesofsulfiderangefrom0.7118to0.7130,higherthanthoseoftheage-correctedDevoniantoPermiansedimentaryrocks(0.7073to0.7101)andtheMiddlePermianEmeishanfloodbasalts(0.7078to0.7039),butlowerthanthoseoftheage-correctedProterozoicbasementrocks(suchastheKunyangandHuiliGroups,87Sr/86Sr200Ma=0.7243to0.7288).Thisimpliesamixedstrontiumsourcebetweentheolderbasementrocksandtheyoungercoversequences.Togetherwithgeologicandpreviousisotopicevidences,weconsideredthatthefluids'mixingisapossiblemechanismforsulfideprecipitationintheTianqiaodeposit.

简介：摘要：EDTA滴定试验是水泥稳定碎石生产过程中检验成品水泥剂量的主要手段，在冷再生水稳碎石生产中，EDTA滴定实验的结果会随着再生材料的来源、掺入量、掺入方式等不同而产生较大差异。通过对两个工程生产的再生水泥稳定碎石进行EDTA滴定实验比较与分析，探究再生材料对实验结果的影响因素。

简介：TotalconcentrationsofZninthesedimentsoftheoffshoreandintertidalareasofthewestcoastofPeninsularMalaysiawererecentlyreportedintheliteraturs.However,totalconcentrationsofmetalsinthesedimentsamplesdonotreflecttheportionorcarrierphasewhichisattributabletoanthropogenicactivitiesandthoseofnaturalorigins.Inthiswork,geochemicalfractionofZninthesedimentsofthesameareaswasstudiedandthepotentialuseofCVasanindicatorofZnpollutionwasdetermined.Thegeochemicalstudybyusingsequentialextractiontechniquerevealedtions,respectively,inthesedimentswhilemostofthetotalzincconcentrations(offshore:70%;intertidal:52%)foundinthesedimentscouldbemostlyduetonaturalorigins(nonresistantfraction).Thus,theZnlevelsintheStraitsofMalaccashouldnotposearisktotheliyingorganisms.BasedonSpearman'scorrelationcoefficients,thesourceofZncontaminationintheStraitsofMalaccawasmainlycontributedbytheintertidalcoastalarearatherthanoffshorearea.ThepresentstudyalsoindicatedthecoefficientofvariationcanbeusedasapotentialindicatoroftotalsummationofgeochemicalZnconcentrationsinthecoastalsedimentbutofdifferentgeochemicalofZnneedsfurthervalidation.

简介：Onthebasisofmineralparagenesisandthechemistryandhomogenizationtemperaturesoffluidinclusions,thephysicochemicalparameterswerecalculatedfortheformationoftheDalingkouAg-Pb-ZudepositinZhejiang.Fromtheearlytothelatestageofmineralizationtheore-formingtemperatureveriationwasfoundtobe298.5℃→267.0℃→217.6℃→167.3℃,withacorrespondingpHchangeof3.0-5.8→6.1→6.7→5.0→7.3.Thepressurechangedfrom403.8to128.5atm,andlogfS2-9.9→-11.2→<-15;logfO2<-44→-45.6--42.6→>-44.2;andlogfCO2around-1.55.Inconjunctionwithgeologicalobservations.thedepositisconsideredtobeofmeso-epithermalorigin,i.e.,itwasformedaftercontinentalvolcanic-subvolcanicactivity.ThemajorfactorsaffectingoreprecipitationarethedecreasingtemperatureandtheincreasingpHofore-formingsolutions.

简介：1IntroductionDengfuxianorefieldliesattheintersectionoftheQin-HangCombinedZone(QCZ)andtheNanlingMetallogenic,andcomprisesXiangdongW-Sndeposit(AlsoknownasDengfuxianW-Sndeposit),Jiguanshi

简介：ThreelogarithmiclinearequationsbetweenDMeV/Land[mNaCl],andtherelationshipofDMeV/LversusF/ClorK/NamoleratioshavebeenestablishedbytheexperimentsofthepartitioningofPbandZnbetweengraniticsilicatemeltandaqueousfluid.Theseresultshavebeenusedtoquantitativelystudysomeessentialproblems,suchasthepossibilityanddegreeofPb-Znmineralizationinthesystemofgraniticmagmaandhydrothermalfluid,andtheinfluenceoftherelativecontentsofalkaliandvolatilesonthePb-Znmineralizationinthesamesystem.Somenewpointshavebeenputforwardinthispaper.

简介：摘要：对一种10mm厚Al-4.3Zn-1.3Mg合金板材进行时效处理并研究了不同时效制度对板材力学性能和组织的影响规律。结果表明，当采用120℃/28h的工艺制度进行时效处理时，板材获得了最佳的强度性能。

简介：摘要：对一种10mm厚Al-4.3Zn-1.3Mg合金板材进行时效处理并研究了不同时效制度对板材力学性能和组织的影响规律。结果表明，当采用120℃/28h的工艺制度进行时效处理时，板材获得了最佳的强度性能。

简介：1IntroductionTheMaozuPb–Zndeposit,locatedintheNortheastofYunnanProvince,southwestChina,isatypicalcarbonate-hosteddepositintheNortheastofYunnanPb–Znmetallogenicprovince.Fluoriteisthemaingangue

简介：【内容摘要】真空断路器具有维护工作量小、断流容量大、重量轻、噪声低、易安装、适宜频繁操作等许多优点，在电力系统10kV-35 kV电压等级中逐渐取代了其它类型断路器，得到了广泛的应用。真空断路器是一种以气体分子极为稀少，分子间的平均自由行程很大，电子与分子相碰撞的机会极少，绝缘强度很高的真空空间为熄弧介质的新型断路器。

简介：试样经盐酸、硝酸分解后在硫酸钾、硫酸作用下沉淀铅，过滤使铅、锌分离，滤液用于测定锌，沉淀用于测定铅，经标准物质和样品验证，本法适合于1％以上铅、锌试样的测定。

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简介：KelanaJayaMunicipalParkisapopularrecreationparkinPetalingJaya.Thefivelakes,locatedwithinthePark,wereex-miningponds,functioningasfloodretentionpondsandreceivingeffluentsfromnearbyhumanactivitiesmainlyfromresidentsandtransportation.Astudywasconductedtodeterminethedistributionandsourcesofheavymetals(Cd,CuandZn)inthesedimentsofKelanaJayaLakes.ConcentrationsofCd,Cu,andZnforsurfacesedimentweredeterminedbyusingaqua-regiamethodandsequentialextractiontechnique.TotalCdconcentrationsrangedfrom0.48μg/gto2.68μg/gdryweight(dw)foralllakes.TotalCdconcentrationsinsedimentofalllakesexceededCCME(CanadianCouncilofMinistersoftheEnvironment,2001)guidelines.TotalCuconcentrationsrangedfrom7.37μg/gto73.6μg/g(dw).OnlyCuconcentrationinonelakeexceededtheCCMEguidelinesbesideshavingthehighestmeanconcentrationamongall.TotalZnconcentrationsrangedfrom107μg/gto529μg/g(dw).Again,TheZnconcentrationsinthreelakeswerefoundtoexceedCCMEguidelinesforZnconcentrationinfreshwatersediment.GeochemicalstudyonsedimentrevealedthatnonresistantfractionsforCd,CuandZnforotherlakesthereCuandZnindicatedthatlakesinthepark,especiallynearoxidationpondandmonsoondrains,couldhavereceivedanthropogenicmetalsfromdomesticwastes.RehabilitationprogramandregularbiomonitoringatKelanaJayaLakesarethereforerecommended.

简介：ThestrongadaptabilityofBroussonetiapapyrifera(L.)Vent.tolowphosphorus(P)conditionscanbeattributedtothelargeamountofroot-exudedorganicacidsandthehighef?ciencyofPextraction.However,microelementcontentsarein?uencedbylow-Pstress,andtheireffectsonthephotosyntheticcapabilityofB.papyriferaremainunknown.Inthisstudy,weinvestigatedtheeffectsoflow-Ptreatmentonnetphotosyntheticrate(P_N);chlorophylla?uorescence(ChlF)characteristics;andFe,Mn,Cu,andZncontentsofB.papyriferaandMorusalbaL.seedlings.ResultsshowthatB.papyriferaexhibitedbetterphotosyntheticcapabilityundermoderatePde?-ciency(0.125,0.063,and0.031mmol/LPtreatments),whereasthephotosyntheticcapabilityofM.albadecreasedundermoderateandseverePde?ciency(0.016and0mmol/LPtreatments).UndermoderatePde?ciency,thedecreaseinCuandZncontentsinB.papyriferawaslowerthanthatinM.alba.UnderseverePde?ciency,aconsiderabledecreaseofphotosyntheticcapabilityinB.papyriferaandM.albawasassociatedwithlowCuandZncontents.ThePNofthetwoMoraceaespeciesexhibitedabettercorrelationwithCuandZncontentsthanwithFeorMncontent.Pde?ciencycouldnotonlydecreasecyclicphotophorylationandphotosyntheticef?ciency,butcouldalsoaffectthestabilityofthylakoidmembranestructureandelectrontransportef?ciencybyin?uencingthecontentsofCuorZn,therebyaffectingphotosynthesis.

简介：ThePengshanSn-Pb-ZnpolymetallicorefieldislocatedintheJiujiang-Ruichangregion,whichisasegmentofthemiddle-lowerYangtzeRivermetallogenicbelt.ThePengshanlateYanshanianburiedplutonwithgraniticcompositionisacalc-alkalinepluton,intrusionofwhichisresponsiblefortheformationoftheSn-Pb-Znpolymetallicdepositthroughprovidingthermodynamicconditionandore-formingmaterial.Thelong-activebasementriftsinitiallyformedintheJinningperiodandthedomalstructurewithinducedsecondaryorderfaultsformedbyemplacementofthepluton,suchasring-detachmentfault,top-detachmentfaultandjointfissure,actasthepassage-wayformagmaandore-formingfluidandimpoundingstructurefororedeposit.ThemagmatoformtheplutonwithDI＞90isintensivelydifferentiated.Thevariationoftheore-formingfluidincompositionwithfallingintemperaturecausedbyactionofmagmatichydrothermalconvectionsystemcombinedwithgroundwaterconvectionsystemattributestomineralizationofvarioustypesintheorefield.Themineralizationprocesscanbedividedintosixstages,i.e.,greisenization,skarnizationofearlystage,fluorite-stanniferoussilicationstage,skarnizationofadvancedstage,quartzandcassiterite-sulfurationstageandcarbonationstage.Themineralassemblagesformedindifferentmineralizationstagesaredifferentowingtotemperaturechangingandmaybeoverlappedinspace.Malayaiteisrecognizedfromthemineralassemblageformedinthefluorite-stanniferoussilicationstage.TheoresinthePengshanSn-Pb-ZnpolymetallicdepositarespatiallyzonedwithvariationfromAs-SnmineralassemblageofhightemperatureintheinnerzonethroughSn-PbandPb-Zn-Agmineralassemblageofmiddletemperatureinthemiddlezonetofluoritemineralassemblageoflowtemperatureintheouterzone.TheexchangingofSn,MgandFebetweenbiotiteandhydrothermalfluidresultedfromvariationofphysicochemicalconditionduringevolutionprocessesofthehydrothermalflu

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