简介:合成了氰根桥联配合物Co[Fe(CN)5NO].5H2O,使用元素分析、热重分析、红外光谱、XRD对配合物进行了表征。红外光谱显示金属离子通过氰根桥联即FeII-CN-NiII传递磁相互作用,是属于桥式氰根配体的CN伸缩振动,而粉末XRD衍射图表明此化合物为面心立方体结构(FCC),空间群为Fm3m(225),晶格常数a=10.2856。通过对该配合物的直流变温磁化率和交流磁化率测定表明金属离子通过氰根传递弱反铁磁作用,根据Curie-Weiss定律,拟合数据获得居里常数C=1.55cm3·K/mol,顺磁居里温度θ=-1.87K。
简介:TN9112001010373光子相关计及DMA数据传输系统设计=ResearchondesignandapplicationofdualdatachannelsDMAtransfersystems[刊,中]/李峰,杨建文,陆祖康,包正康(浙江大学现代光学仪器国家重点实验室.浙江,杭州(310027))∥浙江大学学报.工学版.-2000,34(2).-135-139提出了一种实现双数据通道DMA传输的新方法,并成功地应用于光子相关计中,详细地分析了工作在命令传输方式的操作时序,提出了实现双数据传输方式的逻辑设计。图6表1参5(李瑞琴)
简介:Thestructuralproperties,mechanicalbehavior,andelectronicstructureofthenewlydevelopeddiamondlikeBC5(d-BC5)wasinvestigatedusingdensityfunctionaltheory(DFT)calculations.Theresultsindicatethatd-BC5hasgreatbulkmodulusof393GPa,largeshearmodulusof398GPa,andhighhardnessof62Pa,andthussupportthefactthatd-BC5isanultra-incompressibleandsuperhardmaterial.Remarkably,thesuperhardd-BC5exhibitsmetallicfeatures.Furthermore,thetrendthatthemechanicalbehaviorfallswiththeincreaseofboroncontentwasrevealed.Thecombinationofhugestiffness,highhardness,andgoodmetallicitymakesseriesofdiamondlikeBCx(d-BCx)validforwiderapplicationsincomparisonwithpurediamond.
简介:条纹反射法是一种结构简单的三维面形检测手段,本文对该方法在智能手机、平板等移动设备中的集成和应用进行了研究。首先,对条纹反射法标定误差以及智能设备的特点进行了分析。然后,在分析实际检测中的关键误差基础上,提出了通过相机非线性定标、改善相移算法、格点位置标定、应对相机自动增益调整等一系列方法和算法,在设备现有硬件条件下提高了测量精度和稳定性;最后,使用iPadAir对直径为105mm的SiC反射面进行了实验。结果表明,标定精度在毫米量级时,对反射面的检测精度RMS值达到33μm,并且以低频误差为主,在局部高频区域检测结果有明显优势,证实了在不使用其他外部设备前提下,集成于智能平板的条纹反射法具备几十微米量级精度的检测能力。
简介:DarkMatterParticleExplorer(DAMPE)isapowerfulspacetelescopeforhighenergycosmicraysdetectionsuchas-ray,electronandheavyions.ThemainmotivationofDAMPEistofindtheevidenceofdarkmatterexistence,andthesatelliteisscheduledforlaunchingbeforetheendof2015.ThePlasticScintillatorDetector(PSD),whichisoneofthekeycomponentsoftheDAMPEsystem,hastwomajorfunctionalities:distinguishphotonsfromchargedparticlesbyanti-coincidenceandmeasurethechargeofheavyions.ThePSDisdesignedandfabricatedbytheinstituteofmodernphysics,CAS.Itconsistsof82plasticscintillatorstrips,eachofwhichisreadoutbyPMTatbothends,andadouble-dynodereadoutschemeforPMTisutilizedinordertocoverthelargedynamicrange(fromHtoCa).
简介:Inthiswork,webrieflydiscussanovelclassofmodifiedgravitylikef(T,TG)gravity.Inthisbackground,weassumethenewagegraphicversionofpilgrimdarkenergyandreconstructf(T,TG)modelsfortwospecificvaluesofs.Wealsodiscusstheequationofstateparameter,squaredspeedofsoundandwDE-wDEplaneforthesereconstructedf(T,TG)models.Theequationofstateparameterprovidesphantom-likebehavioroftheuniverse.ThewDE-wDEplanealsocorrespondstoΛCDMlimit,thawingandfreezingregionsforbothmodels.