简介：本文向用户扼要介绍了光束线3W1A及其实验站的辐射安全联锁系统的设计目的、设计思想、系统的功能作用和操作规则。本系统于1996年9月投入试运行，于1998年年底通过院级鉴定和验收。

简介：ToobtainthermotolerantmutantsofG.oxydans,whichcanenhancethetransformationrateofL-sorboseto2-Keto-L-gulonate(2-KLG)at33℃inatwo-stepprocessofvitaminCmanufacture,ionbeamwasusedasamutationsource.GluconobacteroxydansGOandBacillusmegateriumB0wereusedinthisstudy.TheoriginalstrainGluconobacteroxydansGOwasmutatedbytheheavyionimplantationfacilityattheInstituteofPlasmaPhysics,ChineseAcademyofSciences.SeveralmutantsincludingGluconobacteroxydansGI13wereisolatedandcoculturedwithBacillusmegateriumB0at33℃inshakingflasks.TheaveragetransformationrateofthenewmixedstrainGI13-B0inpergram-moleculereached94.4%aftersevenpassagesinshakingflasks,whichwasincreasedby7%whencomparedwiththeoriginalmixedstrainG0-B0(GluconobacteroxydansG0andBacillusmegateriumB0).Moreover,thetransformationrateofI13B0wasstableat94%attemperaturesrangingfrom25℃to33℃,whichwouldbeofmuchvalueinreducingenergyconsumptioninthemanufactureofL-ascorbicacid,especiallyintheseasonofsummer.Toclarifysomemechanismofthemutation,thespecificactivitiesofL-sorbosedehydrogenaseinbothG0andGI13wereestimated.

简介：InthedischargeofEASTtokamak,itisobservedthat（2,1）neoclassicaltearingmode（NTM）istriggeredbymodecouplingwitha（1,1）internalmode.Usingsingularvaluedecomposition（SVD）methodforsoftX-rayemissionandforelectroncyclotronemission（ECE）,thecouplingspatialstructuresandcouplingprocessbetweenthesetwomodesareanalyzedindetail.TheresultsofSVDforECErevealthatthephasedifferencebetweenthesetwomodesequalstozero.Thisisconsistentwiththeperfectcouplingcondition.Finally,performingstatisticalanalysisofγ1/1,ζ1/1andω2/1,wefindthatγ1/1moreaccuratelyrepresentsthecouplingstrengththanζ1/1,andγ1/1isalsostronglyrelatedtothe（2,1）NTMtriggering,whereγ1/1isthewidthof（1,1）internalmode,ζ1/1istheperturbedamplitudeof（1,1）internalmode,andω2/1denotesthemagneticislandwidthof（2,1）NTM.

简介：WehavedevelopedaplasmaetchingsimulatortoinvestigatetheevolutionofpatternprofilesinSiO2materialunderdifferentplasmaconditions.Thismodelfocusesonenergyandangulardependentetchingyield(physicalsputteringinthispaper),neutralandionangulardistributions,andreflectionofionsorneutralsonthesurfaceofaphotoresistorSiO2.TheeffectofpositivechargeaccumulationonthesurfaceofinsulatedmaskorSiO2isstudiedandthechargeaccumulationcontributestoadeflectionofiontrajectory.Thewaferprofileevolutionhasbeensimulatedusingacellular-automata-likemethodunderradio-frequency(RF)biasanddirect-current(DC)bias,respectively.Onthebasisofthecriticalroleofangulardistributionofionsorneutrals,thewaferprofileevolutionhasbeensimulatedfordifferentvariancesofangles.Observedmicrotrenchinghasbeenwellreproducedinthesimulator.Theratioofneutralstoionshasbeenconsideredandtheresultshowsthatbecausetheneutralsarenotacceleratedbyanelectricfield,theirenergyismuchlowercomparedwithions,sotheyareeasilyreflectedonthesurfaceofSiO2,whichmakesthetrenchshallower.

简介：采用在位高压Raman光谱和高压同步辐射能散X射线衍射技术，在室温下对晶粒尺寸为10nm的锐钛矿TiO2进行了压致相变研究，压力范围分别为42．9GPa和23．0GPa，实验结果表明，在16．3GPaTiO2发生了一次结构相变，由原来的锐钛矿结构变为α－PbO2结构（TiO2-Ⅱ），该相变是不可逆的。同体材料TiO2的高压相变结果比较，由于晶粒尺寸的效应，纳米尺寸的锐钛矿TiO2的相变压力明显高于体材料的相变压力。

简介：Magneticspectrumoftheelectromagneticioncyclotronwavesintheterrestrialplasmadepletionlayer（PDL）aresometimesobservedtohaveaBIF（bifurcated）signature,whereadiminutionaround0.5ΩpwithΩptheprotongyrofrequency,occursbetweentwoactivitypeaksinthespectrum.Byone-dimensionalhybridsimulations,theeffectofrelativedriftvelocitiesbetweenprotonsandHe2+onthemagneticspectralsignaturesinthePDLisstudied.Theresultsshowthattherelativedriftvelocityenhancesthedevelopmentofprotoncyclotronwavesanddeclinesthedevelopmentofheliumcyclotronwaves.Theprotoncyclotronwavesarefirstlyexcited,andfollowedbytheexcitationofheliumcyclotronwavesduetotheincreaseintherelativedriftvelocity.Moreover,theboundarybetweentwoactivitypeaksgetsobscure.

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简介：AnovelfittingprocedureisproposedforabetterdeterminationofH2rovibrationaldistributionfromtheFulcher-abandspectroscopy.WehaverecalculatedthetransitionprobabilitiesandtheresultsshowthattheydeviatefromFranck-Condonapproximationespeciallyforthenon-diagonaltransitions.Wealsocalculatedthecompletesetsofvibrationallyresolvedcrosssectionsforelectronimpactd3∏u-X3∑gtransitionbasedonthesemi-classicalGryzinskitheory.AnexampleofexperimentalstudyconfirmsthatcurrentapproachprovidesatoolforabetterdiagnosticsofH2rovibrationaldistributioninelectronicgroundstate.

简介：采用程序升温氮化的方法制备了钼氮化物催化剂，并用EXAFS方法研究了氮化前后Mo原子的局域配位情况。负载MoO3样品的径向结构函数中有三个峰其中前两个峰对应着最近的Mo-O配位壳层，但是第一个峰与第二个峰的比例比晶体MoO3中的比例大很多，表明分子筛负载的MoO3具有更紧密的结构。氮化以后，Mo2N样品的径向结构函数中有三个峰，对应于一个Mo-N和两个Mo-Mo配位壳层，与面心立方模型符合的很好。根据X射线衍射和EXAFS谱的计算表明，Mo2N中的N原子使Mo-Mo键拉长并削弱。分子筛负载的Mo2N样品具有与非负载Mo2N样品相似的径向结构函数，只是对应于Mo-N壳层的峰较弱，表明负载的MoO3更难氮化。

简介：用XPS和同步辐射技术研究了钙钛矿型氧化物La1-xSnxMnO3薄膜的电子结构。特别地，我们采用角分辨X－射线光电子谱技术（ARXPS），研究了薄膜表面最顶层原子种类和排列状况。结果表明，La1-xSnxMnO3薄膜的表面最顶层为MnO2原子平面。在此基础上，我们进一步在原子水平上探讨了薄膜的层状外延生长机理。

简介：本文利用沉淀法制备了粒度分窄，无明显团聚的ZrO2纳米微粒。考察了ZrO2纳米微粒修饰丝光沸石对二甲苯异构化的影响。实验结果表明，经修饰后的丝光沸石催化剂能有效地抑制副反应的发生，提高二甲苯异构化的选择性，超微粒子修饰的丝光沸石的催化活性和选择性明显优地体相材料修饰的样品。

简介：本文对合成制备的LiNiO2、LiCo2和LiNixCo1-xO2正极材料以及稀土金属Ce元素添加改性的正极材料进行了XRD和EXAFS表征。结果表明，随着焙烧温度的升高，物相组成趋于单一，晶格趋向完整，800℃时完全形成LiNiO2、LiCoO2晶相结合。LiNiCoO2样品中Ni/Co比不影响LiNiO2晶相的形成，而只影响其晶相组成；掺杂的稀土金属Ce元素以CeO2状态存在于产物中，CeO2对LiNiO2晶相形成有一定的影响；LiCoO2的焙烧温度不能大于900℃，否则Co被氧化为Co3O4；样品中Ni与Co原子的局域结构，除Ni与Co原子相互影响外，掺杂Ce后对它们的局域结构也有较大影响。

简介：利用同步辐射（BSRF）漫散射站四圆衍射仪，对SiC体单晶的结构进行了判定以及对利用常压化学气相沉积（APCVD）生长的3C－SiC/Si(001）中的孪晶及含量进行了分析。六方{10-15}极图证明了该SiC单晶为6H（H为Hexagonal的缩写）结构。对3C－SiC外延薄膜，Φ扫描证明了3C－SiC外延生长于Si衬底上，外延取向关系为：（001）3C－SiC//(001)Si,[111]3C-SiC//[111]Si。3C－SiC的{111}极图在x=15.8°出现了新的衍射，采用六方{10-10}极图以及基体倒格点111、孪晶倒格点002的Mapping分析了x=15.8°处产生的衍射为3C－SiC孪晶所致，并利用ω扫描估算了孪晶的含量约为1％。