简介：采用L﹣丙氨酸对壳聚糖进行改性，制备了改性壳聚糖，并研究了改性壳聚糖对水溶液中Sr2＋的的吸附性能.结果表明：在吸附时间80min，吸附温度50℃，吸附剂用量0.1g，PH值为10时，L﹣丙氨酸改性壳聚糖对Sr2＋吸附的的吸附率可达31.800%，吸附量为11.925mg/g；L﹣丙氨酸改性壳聚糖微球对高浓度Sr2＋的吸附量最大可以达到30.650mg·g﹣1，吸附率最高可达83.3%；等温吸附结果表明，L﹣丙氨酸改性壳聚糖微球对Sr2＋的吸附符合Langmuir等温吸附方程；L﹣丙氨酸改性壳聚糖对Sr2＋的吸附过程与准二级动力学具有较高的相关性.

简介：Ca8Mg(SiO4)4Cl2:Eu2+phosphordopedwithSr2+cationforCa2+partially,wassynthesizedbysolid-statereactionathightemperatureunderreducingatmosphere,anditsluminescentpropertieswereinvestigated.TheexperimentalresultsindicatethattheemissionintensityofthephosphorincreasesafterbeingdopedwithafewamountofSr2+ion.Theemissionpeakofthephosphorblueshifttoabout464nmwhenthephosphorisdopedwithlargequantityofSr2+ions.TheexcitationspectrumindicatesthatthephosphorcanbewellexcitedbyUVandbluelightfrom300to460nm,andthephosphorwasfittedwellfortheexcitationbyUVorblue-LED.

简介：Differentrareearth(RE)ionsdopantswereaddedintotheSrAl2SiO7:Eu2+phosphorsinordertoenhancethephosphorescenceproperties,andtheeffectoftheREionsincludingYb3+,Ce3+,Nd3+,Dy3+andTm3+,wascomparativelyinvestigated.ItwasfoundthatNd3+additionimprovedthephosphorescencepropertiesobviouslyamongallthestudiedREions.Therefore,Sr1.96–xAl2SiO7:xEu2+,yNd3+phosphorswerestudiedindetail,andtheoptimumEu2+andNd3+concentrationsweredeterminedwiththeafterglowtimeofabout20min.Thephasestructures,photoluminescence(PL)properties,long-lastingphosphorescence(LLP)properties,afterglowdecaycurvesandthermo-luminescence(TL)fortheselectedphosphorsduringthecorrespondingstudywereinvestigated.AllthephosphorsexhibitedgreenPLemissionandLLPemission.ThereweretwoTLbandslocatedatabout325and380Kforthestudiedsamples,andtherelationshipbetweenREadditionandphosphorescencepropertieswasdiscussed.

简介：R2卫星高清接收机是新雷厂家于2012年底推出的一款采用阿里M3606方案的平民高清机,今年4月13日,《山水评测室》收到了这款SR2机器,下面来评测一下该机器的特点和性能。外观功能新雷SR2机器采用彩盒包装（图1）,

简介：15%Ag-addedcubicperovskitesSr0.9La0.1TiO3andRuddlesden-Popper(RP)phasesSr2.7La0.3Ti2O7werefabricatedviahydrothermalsynthesis,coldpressingandhigh-temperaturesintering.Thestructureandthermoelectricpropertieswerealsoinvestigatedforallsamples.TheresultsindicatedthatAgprecipitatedasasecondphase.AgadditionmadeelectricalconductivityandabsoluteSeebeckcoefficientenhanced,asaresult,theZTvalueswereenhancedbothfortwoseries.Comparedwithcubicperovskite,RPphasewassubjectedtosmallerimpactbyAgaddition.ThereasonsforenhancingZTvalueandthedifferentimpactfortwoseriesbyAgadditionwerealsodiscussed.

简介：

简介：微米大小的Sr2(P2O7):Ce，Tb绿黄磷被与它的先锋在不同温度被退火准备综合了由一同沉淀(NH4)在周围的温度的2HPO4。黄磷的阶段结构，谷物尺寸，表面形态学，和光性质被X光检查衍射调查，扫描电子显微镜，传播电子显微镜，和荧光光谱。先锋的产品在1,100点退火了的结果表演??‰浮???匠??伲?????畅？？

简介：Asimplemethodisappliedtocalculatingtheisotopeshifts(ISs)on5S1/2→4D3/2,5/2transitionsof87,88Sr+.FirstwehavecalculatedtheISsoflowertransitionsonaseriesofalkali-likesystemssuchasB2+,Ca+andBa+,whichareinagreementwithotherworks.ThentheISson5S1/2→4D3/2,5/2transitionsof87,88Sr+,whichareusefultostudytheSr+opticalfrequencystandard,areevaluated.

简介：Sr1.995–1.5xGdxSiO4:0.005Eu2+phosphorserieswithx=0–0.08molfornear-ultravioletwhitelight-emittingdiodes(NUVw-LEDs)weresynthesizedviasolid-statereactionmethod.XRDprofilepatternandrefinementresultsdemonstratedthatdopingGd3+ionsresultedinthephasetransformation(β-Sr2SiO4→α’-Sr2SiO4).Thephotoluminescencespectrumofthesamplewithx=0moldisplayedtwoemissionpeakscenteredat470and525nm.Thetwo-peakspectrabecameone-peakspectrawiththeGd3+concentrationincreasing.Actually,thefittingresultsdemonstratedthattheone-peakspectrawerestillcomposedoftwosingleemissionspectra.ThephotoluminescenceintensitywasimprovedandtheCIEchromaticitycoordinateswereadjustedviadopingGd3+.

简介：LongafterglowphotoluminescentmaterialsSr2MgSi2O7dopedwithEu2+,Dy3+werepreparedbysol-gelmethod.ThesynthesizedsampleswerecharacterizedbyX-raydiffraction.Theexcitationspectrum,emissionspectrumandlongdecaycurveweremeasuredandanalyzed.XRDpatternindicatesthatphosphoriswithSr2MgSi2O7crystalstructure.Thewiderangeofexcitationwavelengthindicatesthatluminescentmaterialcanbeexcitedbylightfromultravioletraytovisiblelight.Themainpeakofemissionspectrumislocatedat466nm.Sampleexcitedbyvisiblelightcanemitbrightbluelight,andtheafterglowtimelastsmorethan8h.

简介：Thegreenlong-after-glowluminescencefromTb3+-dopedSr2SiO4phosphors,whicharesynthesizedbythehightemperaturesolidstatereactioninareductiveatmosphere,isobservedinthispaper.Theresultsshowthatunderultravioletexcitation,theobtainedphosphorsproduceanintensegreen-lighting-emissionfromtheTb3+,andthegreen-lightinglongafter-glowluminescencerelatedtoTb3+canlasthalfanhouraftertheirradiationsourcehasbeenremoved.Moreover,theeffectsofco-dopingLi+,Dy3+,Er3+,Gd3+,andYb3+withTb3+onthedecaypropertiesandthermoluminescencepropertiesareinvestigatedtoconfirmthelong-after-glowmechanism.

简介：结构和绝缘的性质(Pb，Sr)有不同Pb和Sr内容的Nb2O6-NaNbO3-SiO2眼镜陶艺被调查。没有Sr替换的眼镜陶艺的XRD模式与Sr替换与那不同，它在后者显示斜方晶的阶段的存在。，TEM明亮的地观察与Sr为样品显示出nanosized微观结构，与分开的使结晶的乐队一起的典型最容易溶解的微观结构在玻璃矩阵被发现。当到Pb的Sr的臼齿的比率是4时，样品的绝缘的性质测量显示绝缘的常数，绝缘的损失，DC地和绝缘的常数的温度依赖的明显的改进?6。

简介：Thenear-ultraviolet(n-UV)excitedblue-emittingSr2MgSi2O7:Eu2+phosphorsareusedforfluorescencelampandtricolorwhiteLEDs.Theeffectofnitrogen-dopedonthestructureofthehostandtheenhancementofphotoluminescenceisexperimentallyinvestigated.Theresultsshowthatastheamountofnitrogen-dopedvariesfrom0to0.6(at.),theluminousintensityisfoundtobeincreasedto169%,andthepartialreplacementofObyNresultsinachangeofthecrystalfieldbymodifyingthesymmetryofthecrystalstructure.Asaresult,withthenitrogen-dopedinsmallamount,theluminousintensity,chromaticitycoordinatesandthecolorpuritycanbeadjustedtoadesiredvalueintheapplications.

简介：同位素在在地球科学跟踪并且标明日期起一个重要作用，特别87Rb-86Sr系统。与地球科学的发展，整个岩石的分析斜面足够地满足要求因为科学研究和微量分析变得越来越重要。激光脱离多收集者诱导地联合的血浆mass-spectrometry(LA-MC-ICP-MS)广泛地由于它的低样品消费在微地区的分析被使用了，高精确性在矩阵上的situ和低要求，但是当它被严重优秀辨别和集体光谱干扰的各种各样的类型限制，精确地与高Rb/Sr比率和低Sr内容特别为样品测量Sr同位素作文仍然是困难的。因而，热电离mass-spectrometry(提姆)分析同位素的比率的最精确、精确的方法，仍然是分析Sr比率的最流行的方法，特别为有低Sr内容的样品。这篇论文在low-Sr的高精确的Sr同位素分析上做系统的评论地质的样品包括微采样的技术，极端低的程序的空白的化学方法和提姆测量技术。极端低的程序的空白和提姆的联合能被用来与ng大小执行样品的高精确的微量分析，它将无疑是为Rb-Sr地球年代学，地球化学和环境研究的一个重要方向。

简介：Eu2+andDy3+codoped(Ca,Sr)7(SiO3)6Cl2yellowphosphorsweresuccessfullysynthesizedbyself-fluxmethod.Thestructure,morphologyandphotoluminescencepropertieswereinvestigatedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andphotoluminescencespectra.Theas-preparedphosphorshowedabroademissionspectrumcenteredat550nmforEu2+single-dopedphosphor,whilelocatedat548–544nmfortheEu2+,Dy3+codopedsamplesunderexcitationat380nmlight.TheemissionintensitywasgreatlyimprovedwhenDy3+wasdopedintothe(Ca,Sr)7(SiO3)6Cl2:Eu2+system.Thecomposition-optimizedsamplewith3mol.%ofDy3+andconstant10mol.%ofEu2+exhibiteda220%PLenhancementcomparedtothephosphorwith10mol.%Eu2+single-doped.Meanwhile,itwasfoundthatthequantumefficiencyofphosphornamely(Ca,Sr)7(SiO3)6Cl2:3mol.%Dy3+,10mol.%Eu2+couldgetupto24.6%.Thesynthesizedyellow-emitting(Ca,Sr)7(SiO3)6Cl2:Dy3+,Eu2+isapromisingcandidateashigh-efficiencyyellowphosphorforNUV-excitedwhiteLEDs.

简介：利用溶胶一凝胶法合成了La1.4Sr1.66Mn2O7（LSMO）粉体材料，中高温电导率（400-900℃）增加较快，具有良好导电性；粉体的1nσT与1／T显示出较好的线性关系，符合小极化子模型的；样品LSMO在中温温度范围内没有发生相变，与XRD的测试结果相吻合；与常用电解质8YSZ结合紧密，没有出现分层现象；未发现新的物相，两者具有良好的化学相容性。

简介：Theobjectiveofthisstudyistoinvestigatetheinfluenceofaddingtinyamountofmixedrareearth(La,Ce)andSrtoAl-20Cu-5Si-2Nifillermetal,byanalyzingthemicrostructure,wettabilityandmechanicalpropertiesofbrazedjoints.Theresultsshowthawiththeadditionofmixedrareearth(La,Ce)intoAl-20Cu-5Si-2Nialloy,theα-AlsolidsolutionaswellasCuAl_2(Ni)intermetalliccompoundphasesignificantlyreduced,whilemoreAl-SieutecticphaseandAl-Si-Cuternaryeutecticphasewereproduced.Andasmixedrareearth(La,Ce)addedin,thewettabilityofAl-20Cu-5Si-2Nifillermetaldecreased,whiletheshearstrengthofthebrazedjointsincreased.TheadditionofMinorSrmodificatedAl-20Cu-5Si-2Nifillermetal,furtherreducedtheCuAl_2(Ni)intermetalliccompoundphase,whichwaspartiallyreplacedAl-Si-Cuternaryeutecticphase.Asaresult,thetensilestrengthaswellasthewettabilityofthefillermetalwasimproved.

简介：利用溶胶-凝胶法合成了La1.4Sr1.6Mn2O7(LSMO)粉体材料,中高温电导率(400-900℃)增加较快,具有良好导电性;粉体的1nσT与1/T显示出较好的线性关系,符合小极化子模型的;样品LSMO在中温温度范围内没有发生相变,与XRD的测试结果相吻合;与常用电解质8YSZ结合紧密,没有出现分层现象;未发现新的物相,两者具有良好的化学相容性。更多还原

简介：ThenameofSRproteinsisderivedfromtheirtypicalRSdomainthatisrichinserine(Ser,S)andarginine(Arg,R).Theyareconservedinevolution.Uptonow,10membersoftheSRproteinfamilyhavebeenidentifiedinhumans.SRproteinscontainoneortwoRNAbindingmotifsasidefromtheRSdomain,andalsopossessspecialbiochemicalandimmunologicalfeatures.AstothefunctionsofSRproteins,theyfacilitatetherecruitmentofthecomponentsofsplicesomeviaprotein-proteininteractiontoprompttheassemblyofearlysplicesome;whileinalternativesplicing,tissue-specificallyexpressedSRproteinalongwiththerelativeratioofSRproteinandheterogeneousnuclearribonucleoprotein(hnRNP)iscomposedoftwomainregulativemechanismsforalternativesplicing.Almostallofthebiochemicalfunctionsareregulatedbyreversiblephosphorylation.

简介：Recently,ShijiazhuangAluminiumPlantandChangchunResearchInstituteofAppliedChemistry,AcademiaSinica,co-developedanewmethodtopro-duceAl-SialloycastingpartsbyemployingAl-Sr-REalloyasmodificatorinsteadoftraditionalsodiumsalt.