简介:Fouriertransformedinfraredspectrometry(FTIR)and27AlMagicAnglespinning(MAS)nuclearmagneticresonancespectroscopywereemployedtocharacterizearsenateadsorptiononamorphousAlgelswithKegginstructureatpH=4–10.Thesestudieshaveproventhat:thesurfacecomplexspeciesofarsenateshowsignificantdifferencesunderacidicandalkalineconditions,whichwasdeducedbasedontheAs-Ostretchingvibrationbandslocatedrespectivelyat774and870cm-1;poorlycrystallineAl13(orAl)-arsenateprecipitationcouldbeeasilyformedunderacidmediumconditionandhighloadinglevel,whichwassupportedbycomparingtheAs-Ovibration(at≈732cm-1)ofprecipitationtoadsorbedAlgels;arsenate(AsO43-)adsorptionhasnoeffectontheKegginstructureofAlgelswithbasicity(R)=2.6and3.0,evenathighloadinglevel,asevidencedbythesignalat≈63×10-6ofmagicanglespinning(MAS)-27AlNMR.Theadsorptionenvelopewasdeterminedbyconventionalbatchexperiments.
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:一、地震基本参数表1 地震基本参数表发震时间年月日时分秒震 中 位 置微 观宏 观东经北纬东经北纬参考地名震级(MS)震源深度(Km)震中烈度 地震类型 199211261847565116°57′25°29′116°57′25°32′连城赖源508Ⅵ主余震型 表中的宏观震中为Ⅵ度等震线的中心位置,位于微观震中南6公里左右。二、地震烈度分布现场考察共勾划出Ⅵ、Ⅴ、Ⅳ度三条等震线(见图16-1)。图16-1 1992年11月26日连城赖源地震等震线图Ⅵ度区:Ⅵ等震线东起赖源乡东西,向北经莒溪乡余地村南,拐向西南穿过东坑村北及冯地村,到陈地村北再转向北东。呈长轴北东50度展布的椭圆形,长轴长约2
简介:Thevolcano-sedimentarysuccessionaroundWadiZaghrainSinai,atthenorthernmostsegmentoftheArabianNubianShield,comprisesvolcanicrocksinterbeddedwithratherimmaturesediments.Thesuccessionisdominatedbyintermediatetosilicicvolcanicsofmedium-tohigh-Kcalc-alkalineaffinity.Itisdividedintotwounits,thelowerunitincludesintermediaterocksanddacitesinterbeddedwithgraywackes,semi-pelitesandpelitesandtoppedbypolymictconglomerates.Thisunitissubjectedtofoldingandregionalmetamorphism(uptogarnetzone)andisintrudedbyquartzdiorite-granodioriteinducing,locally,low-pressurecontactthermalmetamorphism.Theunmetamorphosedupperunitencompassesacidvolcanicsintercalatedwithlitharenite,sublithareniteandminorarenite.Therhyolitesofthisunitpertaintothehighlyfractionatedgranitesandarecharacterizedbyanagpaiticindex(NK/A)rangingfrom0.87to0.96.Theymayreflecteitherextensiveinteractionofsubduction-relatedmagmaswiththecontinentalcrustorachangeinthetectonicregime.Thepresentlithologicalandgeochemicalcharacteristicsofthestudiedsedimentstogetherwithavailablezirconagesindicateratherdistalprovenanceoftheirdetritus.Thisdetrituscomprisesfluvial-alluvialsedimentsaccumulatedintheintermontanebasins,whicharehalf-grabensortiltedfaultblocks.Thetectonicsettingofthedepositionalbasinsisactivecontinentalmarginandcontinentalislandarcs.GeochemicalpatternsoftheZaghravolcano-sedimentarysuccessionindicatetheircorrelationwiththeDokhanVolcanics-HammamatClasticssequenceoftheEasternDesertofEgypt.Also,theZaghravolcanicsdisplaygeochemicalsimilaritieswiththoseexposedinSinai,attheRutig,FeraniandIqnaShar’aareas.TheZaghrasuccessionisdatedasEdiacaranbutisnotrelatedeithertotheensimaticislandarcassemblageortotherift-relatedassemblageformedduringtheearlystagesofthebreak-upofRodiniaaspreviouslythought.
简介:The2018InternationalSymposiumonDeepEarthExplorationandPractices(DEEP)willbeheldinBeijing,ChinainOct24-26.ThesymposiuminthisyearwillemphasizeonupdatedprogressofSinoProbe-Ⅰ,andrecentresearchprogressesofthegloballithosphereresearch.Themeetingwillserveasaplatformwheretheparticipantsexchangeideasaboutdeepexplorationofthelithosphere,betterunderstanddeepprocessesintheearth,expandthenewknowledgeintopracticalapplications,andconsiderthefutureinternationalcollaborationondeepexplorationoftheearth.ThesymposiumishostedbySinoprobe,whichisfundedbytheChineseGovernmentwithunprecedentedscopeandscientificambition.
简介:The26thDecember2004earthquakeofMw9.3isthesecondlargestearthquakeevertohavebeenrecorded.ThisgeneratedatsunamiwhichaffectedseveralAsiancountries.InIndia,theAndaman&Nicobargroupofislands,andcoastalstatesofTamilNadu,AndhraPradeshandKeralawereseverelyaffected.Here,webrieflyprovideanoutlineoftheapproachtakenbyIndiaforanearlywarningsystemformitigationofoceanogenicdisasters.