简介：PhasesandmicrostructuresofthreehighZncontainingAl–Zn–Mg–Cualloyswereinvestigatedbymeansofthermodynamiccalculationmethod,opticamicroscopy（OM）,scanningelectronmicroscopy（SEM）energydispersivespectroscopy（EDS）,X-raydiffraction（XRD）,anddifferentialscanningcalorimetry（DSC）analysis.TheresultsindicatethatsimilardendriticnetworkmorphologiesarefoundinthesethreeAl–Zn–Mg–Cualloys.Theas-cast7056aluminumalloyconsistsofaluminumsolidsolution,coarseAl/Mg（Cu,Zn,Al）2eutecticphases,andfineintermetalliccompoundsg（MgZn2）.Bothofas-cast7095and7136aluminumalloysinvolvea（Al）eutecticAl/Mg（Cu,Zn,Al）2,intermetallicg（MgZn2）,andh（Al2Cu）.Duringhomogenizationat450°C,fineg（MgZn2）candissolveintomatrixabsolutely.Afterhomogenizationat450°Cfor24h,Mg（Cu,Zn,Al）2phasein7136alloytransformsintoS（Al2CuMg）whilenochangeisfoundin7056and7095alloys.ThethermodynamiccalculationcanbeusedtopredictthephasesinhighZncontainingAl–Zn–Mg–Cualloys.

简介：Inapreviousgreenhouseexperiment,weshowedthattherewasaninteractionbetweencuandZn,whichaffectedgrowthandmetaluptakebyyoungbarleyplantsgrownonsoiltowhichCd,Cu,Pb,andZnhadbeenadded.Wesuggestedthattheunderlyingmechanismwasthecontroloftheamountofplant-availableZnbycompetitiveadsorptionbetweenCuandZn,Inordertotestthishypothesis,theadsorptionofZnalone,andinthepresenceofaddedCd,CuandPb,hasbeenmeasuredusingthesamesoil.Followingadsorption,theextractabilityoftheZninCaCl2solutionwasmeasured.TheadsorptionisothermsshowedthatoftheaddedmetalsonlyCuhadalargeeffectonZnadsorption.TheeffectofCuwastoreduceZnadsoptionandtoincreasetheamountofCaCl2-extractable(i.e.plant-available)Zn,inagreementwiththeconclusionsfromthegreenhouseexperiment.ThemagnitudeoftheeffectofCuonplant-avalilableZnwassimilarinbothexperiments.

简介：摘要目的探讨前列腺液锌及全血锌含量对前列腺炎患者的诊断意义。方法采用原子吸收光谱分析法检测前列腺液锌（EPS-Zn）及全血锌（Blood-Zn）。结果前列腺炎组EPS-Zn明显低于正常对组（P＜0.01），而Blood-Zn与正常对照组无明显差异（P＞0.05）。结论检测Blood-Zn对前列腺炎的诊断无意义，EPS-Zn的检测对前列腺炎的诊断及疗效有一定的参考价值。

简介：

简介：ConsideraC^*-system(C(X)zn,α)，whereαisahomeomorphismofXsuchthatα^n=id.TheauthorscharacterizethepurestatespaceofC(X)xαzn,thetransitionprobabilityandorientationonit.Twospecialcases(freeactionandn=2)arestudiedindetail.

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：喷洒的Zn和Zn15Al涂层被选择保护对的高张力水泥(PHC)的结束输送的金属的弧在东北中国在北瓷器和中立草地土壤对盐咸滩土壤的腐蚀堆。在二个模仿的土壤答案的涂的Q235钢样品的腐蚀行为被potentiodynamic极化和电气化学的阻抗光谱学(EIS)调查方法。试验性的结果证明在两个都模仿的答案的矩阵Q235钢的腐蚀被Zn和Zn15Al涂层显著地禁止。Zn和Zn15Al上的腐蚀产品厚、紧缩、坚挺、保护。Zn和Zn15Al涂的样品的腐蚀水流密度icorr与腐蚀时间，和费用转移电阻Rct显然被减少极大地被增加。在模仿的中立草地土壤答案的Zn和Zn15Al的腐蚀电阻索引是比在盐咸滩土壤的那些更突出的。在盐咸滩土壤的Zn15Al的腐蚀电阻比Zn的稍微优异。当喷洒的涂层与环氧基树脂树脂被封上时，涂层的腐蚀电阻进一步显著地被提高。

简介：Three-dimensional(3D)flowerlikehierarchicalZn2GeO4andMn2+-dopedZn2GeO4microstructureshavebeenpreparedbyafacilehydrothermalapproach.X-Raydiffraction(XRD),fieldemissionscanningelectronmicro-scopy(FESEM),transmissionelectronmicroscopy(TEM)andphotoluminescence(PL)spectrometrywereemployedtocharacterizethesamples.SuchflowerlikehierarchicalZn2GeO4microstructureswithanaveragediameterof3―4μmwerefoundtobeconstructedbyabundantsinglecrystallinenanorodsofabout90nmindiameter.TheluminescentpropertiesofZn2GeO4:xMnphosphorswithdifferentcontentsofMn2+asanactivatorwereinvestigated.TheMn2+-dopedsamplesshowedgreenluminescencecorrespondingtothed-dtransitionofMn2+undertheirradiationofUVlight.Theredshift(from531nmto538nm)inλemwithincreasingMn2+contentwasobservedintheluminescentspectra,whichshouldbeattributedtoaweakcrystalfieldbecauseofthesubstitutionofZn2+byMn2+atadistortedtetrahedrallatticesite.

简介：Soilswerecollectedfrom2-year(2-y)and3-year(3-y)oldred-pineseedlingplotsintwotreenurseries,HaywardinthenorthandWilsoninthesouthwesternpartofWisconsinStaterespectively,andequilibratedwith0.01MCa(NO3)2)forsoilsolutionZnandMn(solu-ZnandMn),andwith0.01MCa(NO3)2+0.005MEDTAforsoilabsorbedZnandMn(ad-ZnandMn).BufferingcapacityofsoilZnandMn(b-ZnandMn)wasobtainedfromtheratioofad-ZnandMntothesolu-ZnandMn.Theconcernedtracesinpineseedlingneedles(ndls),stems(sts)androots(rts)weresimultaneouslymeasured.Theresultsobtainedshowthat:About60%ofsolu-andad-Znrangedfrom0.2to0.4andfrom1to2μg/gsoilrespectively.About70%ofb-Znwaswithin3-10.Thehighestcontentofsolu-Zncomparedwiththelowestshowedadiscrepanceofmorethan10-fold.ThetwoformsofsoilZnwerecommonlyhigherinWilsonthaninHaywarkNursery.About80%ofsolu-,ad-andb-Mnwerewithin3-10,5-5.8μg/gsoiland1-2respectively.Influenceoflowbufferingcapacityonsolu-ZnandMnwasabout20timesstrongerthanthatofthehigh.TheE-value,aratioofaccumulatedZnandMninneedlestothoseinthesoilsolution,isprovedtobe:E-Zn>E-Mn;E-sts>E-ndlsorE-rts;andE-2y>E-3y.Curvilinearand/orlinearcorrelationsbetweensoilsolu-,ad-andb-ZnandMnandndls-,sts-,rts-ZnandMnwereatverysignificantorsignificantlevels.Forpredictingndls-ZnandMn,tworealizableandsimplemodelsfromtworegressionequationswereestablishedthroughtheselectionofrelatedparametersanddependentvariables.BinaryregressionanalysisbasicallyeliminatedtheinfluenceofsoilpHonthepredictionofZnandMninneedles.SoilpHwasthusthoughttobeexcludedfromthemodel.

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

简介：摘要院火山成因块状硫化物矿床是指产于海相火山岩系中，与海相火山-侵入活动有关的，在海底环境下由火山喷气(热液)作用和喷气-沉积作用形成的块状或次块状的硫化物矿床。本文从成矿地质背景、形成时代、矿床地质特征等方面总结了VMS-typeCu-Pb-Zn型矿床的特点。

简介：

简介：用EXAFS方法研究了重金属Zn(Ⅱ)在δ-MnO2上吸附的微观结构及吸附机制。在pH5．50，0．1M硝酸钠介质中，吸附-解吸实验表明Zn(Ⅱ）在δ-MnO2上的吸附可逆性很高．EXAFS结果表明，δ-MnO2表面上吸附态Zn2+以六配位的水合离子八面体形式存在。八面体的水合Zn^2+离子与δ-MnO2的结构单元MnO6八面体通过共用O原子结合，形成角-角结合的弱吸附．Zn-O平均原子间距为2．071A，Zn-Mn平均原子间距为3．528A。同一条等温线上随着吸附量增加，角-角结合的弱吸附形式基本上没有变化。Zn(Ⅱ)在δ-MnO2上较高的吸附可逆性是由于吸附态Zn(Ⅱ)与δ-MnO2以弱吸附的角-角形式结合所导致的。

简介：从中学教材中得知,对于任意复数z1,z2,…,zn都有|z1|+|z2|+…+|zn|≥|z1+z2+…+zn|.运用这个不等式,求复杂函数的最小值,方法简捷,但是z1,z2,…,zn满足什么条件,|z1|+|z2|+…+|zn|才取得最小值呢?下面用代数形式给出这个条件.

简介：由于磷化处理工艺简单，操作方便，成本低廉，广泛应用于汽车、航空、造船、机械、家电产品等诸多行业。特别是近几年来，磷化技术的应用领域不断扩大，工艺不断完善，性能比较优异的磷化膜层被陆续开发出来。

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：由陕西宝光真空电器股份有限公司生产的ZN39-40．5系列高压真空断路器是三相交流50HZ、额定电压40．5kV户内高压配电装置。该产品可与JYN1-35／GBC-35型开关柜配套，适用于发电厂、变电站等输配电系统的控制与保护，尤其适用于频繁操作的场所。该产品为手车式，结构合理、维护简便、使用安全可靠。

简介：MagnesiumalloyEZ10(Mg-RE-Zn)wasdeformedintensionattemperaturesfrom20upto520°C.Arapiddecreaseoftheyieldandtensilestrengthwithtemperaturewasobservedattemperatureshigherthan300°C.Ontheotherhand,ductilityofsamplesrapidlyincreasedinthesametemperaturerange.Lightmicroscopyandscanningelectronmicroscopywasusedtorevealthereasonforthesebehaviours.Intermetallicparticlesingrainboundariesareresponsibleforexcellentmechanicalpropertiesatlowertemperatures.Diffusionalprocessesoccurringattemperatureshigherthan300°Csignificantlyinfluencedthedeformationmechanismaswellasthefracturecharacter.

简介：ZN-1阻尼材料是以丁基橡胶为基与酚醛树脂共混而成的粘弹性阻尼材料，具有损耗系数高、使用温度区域宽、转变峰的峰值温度在室温附近、抗老化性能优异等特点，在阻尼夹层结构中有着广泛的应用。

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.