简介：基于我们显示出的动态de本地化现象材料的不同同位素能被分开。我们解释建议计划能用一会儿可得到的试验性的设备在实验室被认识到。[从作者抽象]

简介：ＳｔｕｄｙｏｆＮｅｕｔｒｏｎ－ｒｉｃｈＨｇＩｓｏｔｏｐｅｓ￥ＺｈａｎｇＬｉ；ＺｈａｏＪｉｎｈｕａ；ＷａｎｇＪｉｃｈｅｎｇａｎｄＺｈｅｎｇＪｉｗｅｎＴｈｅｎｅｕｔｒｏｎ－ｒｉｃｈＨｇｉｓｏｔｏｐｅｓ２０５－２０８Ｈｇｗｅｒｅｐｒｏｄｕｃｅｄｉｎ...

简介：ＦｌｕｃｔｕａｔｉｏｎｏｆＥｘｃｉｔａｔｉｏｎＦｕｎｃｔｉｏｎｓｏｆＤａｍｐｅｄＰｒｏｄｕｃｔｓｏｆＩｄｅｎｔｉｆｉｅｄＩｓｏｔｏｐｅｓ￥ＷａｎｇＱｉ；ＬｕＪｕｎ；ＸｕＨｕｓｈａｎ；ＬｉＳｏｎｇｌｉｎ；ＺｈｕＹｏｎｇｔａｉ；ＹｉｎＸ...

简介：Nuclearbindingenergies,chargeradiiandthechargedistributionsofeven-eventin(Sn)isotopesarecalculatedusingrelativisticmeanfieldtheory,andthetheoreticalresultsarefoundtobeinaccordancewiththeexperimentaldata.ThenuclearchargeformfactorsforSnisotopesarecalculatedusingthephase-shiftanalysismethod.ItisshownthattheminimaofthechargeformfactorsshiftupwardandinwardwithanincreaseintheneutronnumberoftheSnisotopes.

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简介：Stableisotopesofmostimportantbiologicalelements,suchasC,H,NandO,affectlivingorganisms.Inrapidlygrowingspecies,deuteriumandtoalesserextentotherheavyisotopesreducethegrowthrate.Atleastfordeuteriumitisknownthatitsdepletionalsonegativelyimpactsthespeedofbiologicalprocesses.Asarule,livingorganisms'resist'changesintheirisotopicenvironment,preferringnaturalisotopicabundances.Thispreferencecouldbeduetoevolutionaryoptimization;anadditionaleffectcouldbeduetothepresenceofthe'isotopicreso-nance'.Theisotopicresonancephenomenonhasbeenlinkedtothechoiceofearliestaminoacids,andthusaffectedtheevolutionofgeneticcode.Totesttheisotopicresonancehypothesis,literaturedatawereanalyzedagainstquantitativeandqualitativepredictionsofthehypothesis.Fourstudiesprovidedfiveindependentdatasets,eachinverygoodquantitativeagreementwiththepredictions.Thus,theisotopicresonancehypothesisisnolongersimplyplausible;itcannowbedeemedlikely.Additionaltestingisneeded,however,beforefullacceptanceofthishypothesis.

简介：Guandishangranitoids与不同规模主要由各种各样的granitoid侵入组成包括Huijiazhuang侵入，Shizhuang侵入和Hengjian侵入，它在1906妈和1848妈之间被形成。根据地质并且petrologicalcharacteristics，这些granitoids能被分类进二个组：更早的gneissicgranodiorites和monzogranites，和以后巨大的leuco-monzogranites。他们的geochemical和Ndisotopic特征显示他们能作为剩余阶段与大陆人弧材料的一种亲密关系，并且与石榴石，辉石，角闪石和斜长石从复杂部分融化ofsupracrustal岩石被导出，例如沙的页岩和泥质岩。黑云母，长石和另外的矿物质在岩浆进化期间是最可能的fractionated。他们的来源可以与大陆人弧有一种亲密关系，并且granitoids能从主要syn-collisionaltolate-orogenic被导出构造环境，它可能与在在北方中国古地台的东方、西方的大陆块之间的最后的合并有关。

简介：Theanalysisofstableisotopesofcarbonandoxygenindifferentcarbonaterocksbythephosphoricacidmethodisnoteasierthanthatbythelasersamplingmethoddevelopedinrecentyears,whichopticallyfocuseslaserbeamswithsufficientenergyonamicroareaofathinsectioninavacuumsampleboxviamicroscope.CO2producedbyheatingdecompositionofcarbonatewaspurifiedbythevacuumsystem,andthestableisotopicvaluesofcarbonandoxygenwerecalculatedandanalyzedonamassspectrometer.Thispaperadoptedthelasermicro-samplingtechniquetoanalyzethestableisotopesofcarbonandoxygenindolomite,carbonatecement,stromatoliteanddifferentformsofdawsonite(donbassite).Resultsindicatedthatthelasermicro-samplingmethodiseffectiveinanalyzingcarbonatecompositionandcouldbeaconvincingproofforjustificationoncarbonatecompositionanalysis.

简介：对称精力的密度依赖和在质子(中子)的中子皮肤的厚度的效果在Sn同位素上导致了反应借助于改进分子的动力学模型被调查。调查证明为质子的反应十字节的目标尺寸依赖在Sn同位素上导致了反应对对称精力和对目标的中子皮肤的厚度敏感的更少的密度依赖敏感原子核，而是那，因为中子在Sn同位素上导致了反应，它是对对称精力的密度依赖敏感、对目标原子核的中子皮肤的厚度敏感的更少。

简介：Asapexpredators,sharksareofecologicalandconservationimportanceinmarineecosystems.Inthisstudy,trophicpositionsofsharkswereestimatedusingstableisotoperatiosofcarbonandnitrogenforfiverepresentativespeciescaughtbytheChineselonglinefleetinthemid-eastPacific,i.e.,theblueshark(Prionaceglauca),thebigeyethreshershark(Alopiassuperciliosus),thesilkyshark(Carcharhinusfalciformis),thescallopedhammerhead(Sphyrnalewini),andtheoceanicwhitetipshark(Carcharhinuslongimanus).Ofthesespecies,oceanicwhitetipsharkhasthelowesttrophiclevelandmeanδ15Nvalue(3.9and14.93‰±0.84‰),whereasbigeyethreshersharkhasthehighestlevel/values(4.5and17.02‰±1.21‰,respectively).Thebigeyethreshersharkhassignificantlyhigherδ15Nvaluethanothersharkspecies,indicatingitshighertrophicposition.Thebluesharkandoceanicwhitetipsharkhassignificantlyhigherδ13Cvaluesthanbigeyethreshershark,silkysharkandscallopedhammerhead,possiblyduetodifferentdietsand/orlivinghabitats.Thestableisotopedataandstomachcontentdataarehighlyconsistent,suggestingthatstableisotopeanalysissupplementstraditionalfeedingecologystudyofsharks,andthuscontributestounderstandingtheirtrophiclinkage.

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简介：InfluenceoftheeffectivefermionhexadecapoleforcenewlyincorporatedinamicroscopicsdgIBM-1onspectra,reducedE2andE4transitionmatrixelements(T(E2)sandT(E4)s)intheeven-evenplatinumisotopes(A=192,194,196,198)isinvestigatedintermsofnumericalcalculations.ItisfoundthattheintroducedinteractioncausesonlylimitedmodificationtothespectrumandT(E2)s,apartfromafewexceptions.However,itplaysanessentialroleindescribingE4transitions.Thusinthecasethattheinteractionisincorporatedwithcertainstrength,areasonabledescriptionofalltheE4transitionsintheplatinumisotopesisreachedinthemicroscopicsdgIBM-1incomparingbothtoexperimentaldataandtheresultscalculatedinphenomenologicalbosonmodel.``

简介：ＩｓｏｔｏｐｅｓＴｅｍｐｅｒａｔｕｒｅｉｎ４０Ａｒ＋１５８Ｔｂａｎｄ１０８ＡｇＲｅａｃｔｉｏｎｓａｔ３０ＭｅＶ／ｕ￥ＤａｉＧｕａｎｇｘｉ；ＦｕＹａｎｂｉａｏ；ＨｅＺｈｉｙｏｎｇ；ＤｕａｎＬｉｍｉｎ；ＬｉＺｕｙｕａｎｄＺｈａｎｇＢａｏｇ?..

简介：Horizontalandverticaldistributionsofδ18Oandδ13Cwereinvestigatedinshellsoffourplanktonicforaminiferalspecies,Globigerinoidesruber,Globigerinoidessacculifer,PulleniatinaobliquiloculataandNeogloboquedrinadutertrei,fromatotalof62core-topsedimentsamplesfromtheIndonesianthroughflowregion.Resultswerecomparedtomodernhydrologicconditionsinordertoexplorepotentialofproxiesinreconstructingfluvialdischargeandupperoceanwatercolumncharacteristicsinthisregion.Ourresultsshowthat,intheMakassarStrait,bothofdepletedδ18Oandδ13Cofthesefourspecieswerelinkedtofreshwaterinput.IntheBaliSea,however,depletedδ18Oandδ13Cforthesespeciesmaybeduetodifferentreasons.Depletedδ18Owasaresultoffreshwaterinputandaswellinfluencedbyalong-shorecurrentswhiledepletedδ13CwasmorelikelyduetotheJava-Sumatraupwelling.Comparisonofshellδ18OrecordsandhydrographicdataofWorldOceanAtlas2005suggeststhatG.ruberandG.sacculifercalcifywithinthemixed-layer,respectivelyat0–50mand20–75mwaterdepth,andP.obliquiloculataandN.dutertreiwithintheupperthermocline,bothat75–125mwaterdepth.N.dutertreicalcifiesatslightlydeeperwaterdepththanP.obliquiloculatadoes.Ingeneral,δ13CvaluesofbothG.ruberandG.sacculiferarelargerthanthoseofP.obliquiloculataandN.dutertreiatallsites,possiblyrelatedtodepthhabitatsofthesespeciesandverticaldistributionofnutrientsintheIndonesianthroughflowregion.

简介：AsshaleexploitationisstillinitsinfancyoutsideNorthAmericamuchresearcheffortisbeingchannelledintovariousaspectsofgeochemicalcharacterizationofshalestoidentifythemostprospectivebasins,formationsandmaptheirpetroleumgenerationcapabilitiesacrosslocal,regionalandbasin-widescales.Themeasurementoftotalorganiccarbon,distinguishingandcategorizingthekerogentypesintermsoil-proneversusgas-prone,andusingvitrinitereflectanceandRock-Evaldatatoestimatethermalmaturityarestandardpracticeintheindustryandappliedtosamplesfrommostwellboresdrilled.Itisthetrendsofstableisotopesratios,particularlythoseofcarbon,thewetnessratio(C1/∑(C2+C3)),andcertainchemicalbiomarkersthathaveprovedtobemostinformativeaboutthestatusofshalesasapetroleumsystem.Thesedatamakeitpossibletoidentifyproduction'sweet-spots',discriminateoil-,gas-liquid-andgas-proneshalesfromkerogencompositionsandthermalmaturities.Rolloversandreversalsofethaneandpropanecarbonisotoperatiosareparticularlyindicativeofhighthermalmaturityexposureofanorganic-richshale.Comparisonsofhopane,streraneandterpanebiomarkerswithvitrinitereflectance(Ro)measurementsofthermalmaturityhighlightdiscrepanciessuggestingthatRoisnotalwaysareliableindicatorofthermalmaturity.Majorandtraceelementinorganicgeochemistrydataandratiosprovidesusefulinformationregardingprovenance,paleoenvironments,andstratigraphic-layerdiscrimination.Thisreviewconsidersthedatameasurement,analysisandinterpretationoftechniquesassociatedwithkerogentyping,thermalmaturity,stableandnon-stableisotopicratiosforrocksandgasesderivedfromthem,productionsweet-spotidentification,geochemicalbiomarkersandinorganicchemicalindicators.Italsohighlightsuncertaintiesanddiscrepanciesobservedintheirpracticalapplication,andthenumerousoutstandingquestionsassociatedwiththem.

简介：HotnucleiwithdifferentN/Zratiowereproducedbyusing~(40)Arbeamon~(112)Snand~(124)Sntarget,respectively.Theenergyspectraandtheemissionprobabilitiesofhydrogenisotopesareanalyzedinthe30MeV/u~940)Ar+~(112,124)Snreactions.PartialemissionprobabilityP_iofacertainspeciesiisdefinedhereby

简介：CryogenianDatangpo形成在在Sturtian和Marinoan冰川期之间的间冰期的时间期间被扔。我们在东北贵州从基础Datangpo形成学习了氮同位素作文和黑页岩的瞬间的内容，华南，海洋的氧化还原作用变化和氮在间冰期的时间期间骑车一次尝试重建。象geochemical侧面一样基于岩石层位学，基础黑页岩能被划分成四间隔：间隔1有最低15N价值(+5.0)；在间隔2，15N价值在+6.4和+7.4(第一座山峰)之间变化；15在+6附近的N；并且间隔4被它的更高的15N价值，在+6.7和+7.8(第二座山峰)之间。瞬间的丰富因素的价值与上升stratigraphic趋势从56.8～2.6减少。它在Sturtian冻结成冰以后立即显示了那，在在到Yangtze站台的南部的边缘的斜坡的架之间的过渡地区上面的海洋的海水被成层，与浅海水是oxic，但是深水beingsulfidic。随后，尽管有一个oxic条件的短出现，高denitrification率在表面海水在扩展suboxic区域占优势，并且深海水仍然是缺氧或平的euxinic。