简介：Trivalentsamariumdopedbariummolybdate（BaMoO_4：Sm~（3＋））redphosphorwassuccessfullysynthesizedbyhydrothermalmethod.Thecrystalstructure,morphologyandphotoluminescentpropertywerecharacterizedbyX-raydiffraction,fieldenvironmentalscanningelectronmicroscopyandphotoluminescencespectroscopy.TheresultsindicatedthatthesynthesizedBaMoO_4：Sm~（3＋）phosphorconsistedofapurephasewithanoctahedralstructure.Themainexcitationpeakswerelocatedat362,404,445and477nm,respectively,andwereobviouslyobserved.Themainemissionpeakswerelocatedat533,566,602and646nm,respectively.Thephosphorsexhibitedaredperformanceat646nm,whichwasappropriatefortheultraviolet-lightemittingdiode（UV-LED）andblueLED.TheluminescentintensityofBaMoO_4：Sm~（3＋）increasedwithanincreaseinthedopingamountofSm~（3＋）.Theluminescentintensityhadtheoptimalvalueforx=0.03.WhenthedopingamountofSm~（3＋）wasfurtherincreased,theconcentrationquenchingphenomenonwasobserved.Monovalentlithium（Li＋）cationwasusedasachargecompensator.TheluminescenceintensityfirstincreasedwithincreasingLi＋dopingconcentration,andthendecreased.TheoptimalcontentofLi＋wasabout2%.TheBaMoO_4：Sm~（3＋）phosphorpreparedinthisstudycouldactassuperiorredphosphorforwhiteLEDs.

简介：YAG:Ce3+(Yttriumaluminumgarnet)fluorescencepowdersweresuccessfullypreparedbyco-precipitationmethodusingaluminumnitrate,yttriumnitrate,cerousnitrateasthestartingmaterialsandammoniumcarbonateasprecipitant.TheproductswerecharacterizedbyX-raypowderdiffraction,luminescencespectrometer,transmissionelectronmicroscope(TEM).TheXRDresultsshowedthattheobtainedYAG:Ce3+fluorescencepowdershadthecrystallinestructuresofYAGatcalcinationstemperatureof900oCandtheTEMresultsshowedthatthegraindiameterswereabout100nm.TheYAG:Ce3+fluorescencepowders,synthesizedbyco-precipitationmethod,hadthebestluminescencepropertywhentheCedopingamountwasx=0.06inthemolecularformulaofY3-xCexAl5O12,thecalcinationstimewas2handthecalcinationstemperaturewas1000°C.

简介：TheNaGd（WO_4）_2：Eu~（3＋）phosphorswerepreparedbythemicroemulsionmediatedhydrothermalmethod.ThemorphologyandsizeofthesamplescouldbedependentonthepHintheinitialsolution.Thesephosphorsobtainedhadastrongabsorptionat395nmmatchingwiththepopularemissionofnear-UVLEDchips,andcouldemitintenseredlightat616nm.Thesmallellipsoid-likeparticlesorshortrodswereprovidedwithlargeparametersofoscillatorstrength？_2andasymmetryratio.Comparedtotheellipsoid-likephosphors,therod-likephosphorstookonstrongeremission,longerlifetimeandlargerquantumefficiency.Thisworkdemonstratedthattheone-dimensionNaGd（WO_4）_2：Eu~（3＋）phosphorsmightbeamorefavorabledevicethanzero-dimensiononesforphotoluminescence.

简介：LiNbO3单个水晶与的生长嗯(3+)并且Zn(2+)共同做使用布里奇曼方法和它的典型吸收系列和荧光系列被报导。开始包含Zn(2+)(3%)的大尺寸的晶体并且嗯(3+)(0.6%)用象0.81.5公里·h的生长率那样的优化条件与好光质量被获得(?1)并且大约3035°C·厘米的一个温度坡度(?1)越过稳固液体的接口和封上的铂坩锅。X光检查衍射和微分热分析(DTA)被用来描绘晶体。结果显示集中嗯(3+)在晶体，他们的吸收紧张，和他们的荧光紧张的离子在晶体从底部减少到顶。为水晶的上面的部分，然而，起来变换荧光紧张比800或970nm泵激动的更低的部分的高。水晶格子，他们的结构的缺点和他们的有效分离的效果嗯(3+)离子关于起来变换荧光紧张的变化被讨论。

简介：随着闪速炉的投料量和精矿中杂质含量的逐步升高，进入余热锅炉和后续排烟系统的烟尘量也随之大幅增加，部分在余热锅炉未能硫酸盐化的烟尘，由于其粘附性较强、不易清除，在余热锅炉、鹅颈烟道、沉降室以及电收尘内大量粘结，为了确保余热锅炉和后续排烟系统的正常运转和排烟畅通，通过大量研究论证，对炉况、控制参数、物料性质、系统漏风、EF烟气等方面的控制，成功有效降低了SO，发生率。

简介：Whitelight-emittingYVO_4：1mol.%Dy~（3＋）,xmol.%Eu~（3＋）phosphorpowderswithordermorphologyandwellcrystallizationwerehydrothermallysynthesizedat180°C.Themicrostructure,white-lightemission,andlight-emittingmechanismofthepowderswerecarefullystudiedusingX-raydiffractometry,scanningelectronmicroscopyandphotoluminescencespectra.TheexcitationandemissionspectraofthephosphorpowdersindicatedthecoexistenceofefficientenergytransferfromEu~（3＋）toDy~（3＋）andinefficientenergytransferfromDy~（3＋）toEu~（3＋）besidestheenergytransferfromVO_4~（3–）toEu~（3＋）.IncreasingtheEu~（~（3＋））concentrationinitiallyenhancedandthenweakenedtheluminescentintensityofDy~（3＋）.Thewhite-lightemissionsofYVO_4：1mol.%Dy~（3＋）,xmol.%Eu~（3＋）phosphorpowderswerebothrelatedtotheenergytransferbetweenVO_4~（3–）andDy~（3＋）/Eu~（3＋）,aswellasbetweenEu~（3＋）andDy~（3＋）.TheinefficientenergytransferfromDy~（3＋）toEu~（3＋）wasfirstfound.

简介：

简介：Eu-activatedCaMoO4phosphorswereco-precipitatedinanaqueoussolution,andNH3·H2O,NH4HCO3and(NH2)2COaspre-cipitatingaidagentswerecomparedbasedonthemorphologyandparticlesizedistributionofthephosphorsamples.Sm3+assensitizerionwasinvestigatedontheluminescenceofCaMoO4:Eu,anditcouldstrengthenthe406nmabsorptionofthisphosphor.Atlast,thescheeliteCaMoO4:EuandwolframiteZnMoO4:Euwereselectedtocomparetheirhostabsorption.TheresultshowedthatthescheelitemolybdatehostexhibitedstrongerUVabsorptionthanwolframiteone.

简介：AseriesofMn-basedcatalysts,MnOx,MnOx-CeO2,Pd-Mn-Ce,MnOx/ACwereprepared.AndtheirperformancesforNOlow-temperatureSCRwereinvestigatedinthisstudy.TheNOconversionisabout90%at100℃onMnOx-CeO2andalmostallNOcanbeconvertedat120℃.SimilarresultsarealsoobservedinthetestsonMnOx-CeO2/AC.Theexcellentlow-temperaturecatalyticactivityofmodifiedMn-basedcatalysts,whichmaybemainlyduetotheoxygenstoragefunctionofCeO2,canimprovetheoxygenflowonthecatalystssurface.ThentheoxidationofNOtoNO2isaccelerated,whichisthekeystepofNOSCR.

简介：ThedopedZnOnanorodsasaphotocatalystwithdifferentEucontentswerepreparedbymicrowaveassistedmethodandtheywerecharacterizedbymeansofX-raydiffraction(XRD),energy-dispersiveX-rayspectroscopy(EDS),UV-Visspectroscopy,surfaceareaBrunauer-Emmett-Teller(BET),X-rayphotoelectronspectroscopy(XPS),scanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM).TheaveragecrystallitesizeandbandgapenergyofEu-dopedZnOwerevariedwiththeEucontent.TheXRDpatternofEu-dopedZnOindicatedhexagonalcrystalstructurewithanaveragecrystallitesizeof25nm.ThepresenceofeuropiumwithtrivalentstateanditsdopingsuccessfullyintothecrystallatticeofZnOmatrixwereconfirmedbyXPStechnique.ThephotocatalyticactivityofEu-dopedZnOnanorodswasevaluatedformethylorangedegradation.Thephotocatalyticexperimentsshowed～91%degradationofmethylorangeover0.2mol.%EudopedZnOsamplewithin3hunderUVlight(365nm).

简介：

简介：NanosizedBaCeo.95Yo.o5O3-δpowderswiththehomogeneouscompositionweresynthesizedbyanewcombustionprocessbasedonthePechinimethod.Apolymericprecursorsolwasformedbyuseofcitricacidandethyleneglycolasthechelatingagentsofmetalions.Theperovskite-typeBaCeo.95Yo.o5O3-δpowderswithuniformshapeandsmallerthan40nminsizedwereobtainedthroughthecombustionofthepolymericprecursorsolattheexistenceofnitricacidandammoniumhydroxide.Itwasfoundtheparticlesizecouldbecontrolledbymodulatingthequantitiesofnitricacidandammoniumhydroxide,thequantitiesoftheresidue,carbonateionswerealsoaffectedbythequantitiesofthecitricacidandethyleneglycol.

简介：YbF2.357,YbF3,Ba2YbF7,andBa2upconversionnanocrystalsdopedwithemitterEr3+ionweresynthesizedinthesamesolventsystemjustwithchangingthemolarratioofBa2+toYb3+intheprecursor,whichcorresponedtothecrystalphasesofrhombohedral,orthorhombic,tetragonal,andcubic,respectively.Allthesamplesemittedboth660nmredlightand543/523nmgreenlightwhichoriginatedfromEr3+-4fnelectronictransitions4F9/2-4I15/2and4S3/2/2H11/2-4I15/2,respectively.ItwasworthmentioningthatYbF3:Er3+,Ba2YbF7:Er3+,andBaF2:Er3+couldemitdazzlinglybrightlightevenundertheexcitationofa980nmCWlaserwithoutputpowerof0.1W.Upconversionemissionmechanismanalysisindicatedthattheintensityratioofredtogreenlighthighlydependedonthesynergisticeffectofcrystalstructure,concentrationquenching,andparticlesize,butwerenotsensitivetocrystallinityaspreviouslyreportedforNaLnF4（Ln=lanthanide）.

简介：近日，江西省科技厅在南昌组织召开了国家铜冶炼及加工工程技术研究中心科研项目鉴定会，标志着江西又有3项铜冶炼及加工技术再上新台阶，达国际水平。鉴定会由中国工程院院士邱定蕃主持。

简介：

简介：SmOHCO3micro/nanoparticleswerepreparedinwater/oil(W/O)reversemicroemulsioncomposedofcetyltrimethylammoniumbromide(CTAB),n-octane,n-butanol,Sm(NO3)3·6H2Oandureaaqueoussolutionbythecouplingrouteofhomogeneousprecipitationwithmicroemulsion.ThenanoparticleswerecharacterizedandanalyzedbyX-raypowderdiffraction(XRD),thermalgravimetricanddifferentialthermalgravimetricanalysis(TG-DTG),Fouriertransforminfraredabsorptionspectra(FT-IR)andscanningelectronmicroscope(SEM).TheresultsshowedthatthephaseSmOHCO3micro/nanoparticleswasinagreementwithpureorthorhombicphase.ThedifferentmorphologiesofSmOHCO3micro/nanoparticleswithgoodmonodispersityandsizewereobtainedbyregulatingthereactiontemperatureandreactiontime.PossibleformationmechanismsofthemorphologicalstructureofSmOHCO3wereproposedanddiscussed.

简介：黄磷(Bi1-xSmx)2ZnB2O7(x=0.01，0.03，0.05，0.07，和0.09)被常规稳固的州的反应综合。所有样品的纯净被X光检查粉末衍射(XRD)检查。XRD分析证明所有这些混合物具有Bi2ZnB2O7的一个单个阶段，显示在Bi2ZnB2O7的双性人(3+)能被没有晶体结构的变化的Sm(3+)部分代替。在房间温度的刺激和排放系列显示出Sm(3+)的典型4f-4f转变。主导的刺激线在404nm附近由于(6)H5/2→(4)K11/2和排放光谱在563，599，646，和704nm由一系列线组成由于(4)G5/2→(6)H5/2，(6)H7/2，(6)H9/2，并且(6)H11/2分别地。在Bi2ZnB2O7的Sm(3+)的最佳的集中关于3mol%(相对1mol双性人(3+))并且批评距离Rc作为2.1nm被计算。Bi1.94Sm0.06ZnB2O7的排放紧张的温度依赖在在100和450K之间的温度范围被检验。紧张下降了到起始的紧张的一半的熄灭的温度是280K。为在Bi1.94Sm0.06ZnB2O7的Sm(3+)的一生作为0.29和1.03ms的价值被适合。

简介：

简介：在不同温度下对用金属锰法制得Ｍｎ３Ｏ４粉末和含有部分Ｍｎ（ＯＨ）２的Ｍｎ３Ｏ４粉末分别进行除气处理，然后用静态氮吸附法对其进行对比实验，测试其在各自温度处理后的比表面积。结果表明，在金属锰法制取高纯Ｍｎ３Ｏ４粉末时，应使部分Ｍｎ（ＯＨ）２保留下来，然后对其进行高温（如２００℃）处理，这样可以大大提高高Ｍｎ３Ｏ４粉末的比表面积。

简介：国务院办公厅近日印发《关于进一步推进排污权有偿使用和交易试点工作的指导意见》（以下简称《意见》），部署充分发挥市场机制在环境保护和污染物减排中的作用，促进主要污染物排放总量持续有效减少，提出到2015年底前试点地区全面完成现有排污单位排污权核定，到2017年底基本建立排污权有偿使用和交易制度，为全面推行排污权有偿使用和交易制度奠定基础。