简介:StudyofNeutron-richHgIsotopes¥ZhangLi;ZhaoJinhua;WangJichengandZhengJiwenTheneutron-richHgisotopes205-208Hgwereproducedin...
简介:Comparativestudyontheactivityandkinecticpropertiesofacidphosphatase(ACPase)ofthreesoilsamendedwithHgandCuatconstanttemperatureandhumiditywascarriedout.TheresultsindicatedthattheinhibitiononACPaseofthethreesamplesoilsbyHgandCuvariedwiththecontentofsoilorganicmatterandpH,where,Soil1wasthemostseriouslycontami-natedduetoitslowestcontentoforganicmatterandthelowestpHamongthreesamples,Soil2tookthesecondplace,andSoil3wastheleastcontaminated.ExceptSoil3,theactivityofsoilACPasetendedtoincreasealongwiththecontacttimeunderthesametypeandthesameconcentrationofheavymetal.InparticulartheVmaxvaluesofACPaseinallthreesamplesdecreasedwithincreasingHgandCuconcentration,whereastheKmvalueswereaffectedweakly.AccordingtothechangeofVmaxandKmvalues,CuandHghadthesameinhibitioneffectonsoilACPase.Bothofthemmaybeatypeofcompoundofnon-competitiveandanti-competitiveinhibition.StatisticanalysesindicatedthatactivitiesofsoilACPaseandVmaxvaluescouldserveasbioindicatortopartiallydenotetheheavymetalHgandCucontaminationdegree.
简介:介绍了南开大学在实用Tl和Hg系高温超导薄膜方面的研究工作。在Tl系高温超导研究领域,利用磁控溅射和后退火两步法在LaAlO3(001)衬底上制备出高质量的Tl-1212和Tl-2212超导薄膜,超导临界转变温度Tc分别为92K和106K;在两步法的基础上,利用两次后退火,得到Tl,Bi-1223超导薄膜,超导临界转变温度Tc可以达到110K;同时,利用阳离子置换反应技术,在Tl-1212和Tl-2212超导薄膜基础上得到Hg-1212超导薄膜,利用Tl-2223超导薄膜作为先驱膜,得到Hg-1223超导薄膜,结果显示,Hg-1212和Hg-1223超导薄膜的临界转变温度Tc可分别高达124K和132K。为满足Tl系高温超导薄膜的微波应用需求,分别在LaAlO3、蓝宝石、氧化镁(MgO)衬底上制备出2英寸双面Tl-2212超导薄膜,该超导薄膜具有均匀的超导特性,薄膜超导特性优良,为制备高温超导微波无源器件提供了基础。
简介:CorrelationandpathanalysismethodswereusedtostudytherelationshipbetweensoilpropertiesandthedistributionofdifferentsoilHgfractionswithninerepresentativesoilsfromChongqing,China.Resultsshowedthatclay(<2m)couldincreasewater-solubleHg(r=0.700*).Soilorganicmatter(OM)couldenhancetheincreaseofelementalHg(r=0.674*).Thehigherthebasesaturationpercentage(BSP),themoretheresidualHg(r=0.684*).OrganicHg,thesumofacid-solubleorganicHg.andalkali-solubleHg,waspositivelyaffectedbysilt(2~20μm)butnegativelyaffectedbypH,withthedirectpathcoefficientsamountingto1.0487and0.5121,respectively.ThepositiveeffectofOMandnegativeeffectofBSPonorganicHgwerethemostsignificant,withthedirectpathcoefficientsbeing0.7614and-0.8527,respectively.Theindirecteffectofclay(<2μm)viaBSP(pathcoefficient=0.4186)wasthehighest,showingthattherealinfluencingfactorintheeffectofclay(<2μm)onacid-solubleorganicHgwasBSP.SincetheavailableHgfraction,water-solubleHg,waspositivelyaffectedbysoilclaycontent,andthequiteimmobileandnotbioavailableresidualHgbysoilBSP,suitablereductionofclaycontentandincreaseofBSPwouldbeofmuchhelptoreducetheHgavailabilityandHgactivityinHg-contaminatedsoils.
简介:Primary Search for New Neutron-rich Nuclide 209HgPrimarySearchforNewNeutron-richNuclide209Hg¥ZhangLi;ZhaoJinhua;ZhengJiw...