The applied development of ferrate used as cathode materials

介绍了高铁酸盐的研究发展概况。结合高铁酸盐在水溶液体系和非水溶液体系电池中的应用,对将其作为一种新型正极材料的电化学特性进行了讨论。The recent development survey of ferrate was reviewed especially as cathode materials in batteries. The application as active materials in aqueous and non-aqueous battery system was presented. It was shown that the ferrate could be used as cathode active material in alkaline Zn/ferrate( Ⅵ), MH/ferrate(Ⅵ㈡) and lithium batteries and possessing of higher capacity than Zn/MnO? and Li/LiMn2O4 batteries respectively. However the stability of these batteries was not satisfactory due to the characteristics of ferrate. It would be key work to improve the stability of ferrate ongoing process

柱前衍生化高效液相色谱法测定2-去氧葡萄糖的含量

目的建立柱前衍生化高效液相色谱法测定2-去氧葡萄糖(2-DG)含量的方法。方法采用1-苯基-3-甲基-5-吡唑酮(PMP)为柱前衍生化试剂,将2-DG在碱性条件下衍生化后直接进样测定。分离柱为HypersilODS2色谱柱(4.6 mm×250 mm,5μm),流动相为100 mmol·L-1醋酸铵缓冲液(pH 5.5)-乙腈(78∶22),流速1.0 mL·min-1,波长249 nm。结果 2-DG在19.68~393.6μg·mL-1浓度范围内与峰面积具有良好的线性关系(r=0.9997);其定量限(S/N=10)和最低检出限(S/N=3)分别为7.8和3.1 ng;平均回收率为101.21%,RSD 0.63%。结论该方法简便实用、检测灵敏度高、测定结果准确,适用于2-DG的质量控制

Preparation and electrochemical performance of Ni-Sn alloys

[中文文摘]作为锂离子电池用非碳类负极材料,合金或金属间化合物备受关注。合金材料在循环过程中的体积变化是一个致命缺点。从抑制体积变化的角度出发,根据"BufferMatrix"的概念,将活性相植入到非活性相载体中。镍作为非活性相,锡作为活性相,用不同的方法制备了非晶态锡镍合金和晶态锡镍合金(Ni3Sn),研究了其形貌特征、晶体结构及电化学性能。在高温下用氢气还原的Ni3Sn具有稳定的晶体结构、较高的比容量(300mAh/g)和优良的循环性能。[英文文摘]As a carbon alternative anode material for Li-ion battery, alloys or inter-metal compounds were focused intensively.The alloy materials had a fatal disadvantage that the volume swelling existed during the cycles.The active materials embedded in inactive carrier based on the concept of "Buffer Matrix" to restrain the volume swellings. Ni as an inactive phase and Sn as an active phase, amorphous Ni-Sn alloy and crystalline Ni_3Sn were synthesized employing different methods which led to different morphology.The morphology characteristics , crystal structures and electrochemical performance of the materials were investigated.Ni3Sn reduced by H2 at high temperature had a stable crystal structure ,higher specific capacity (300 mAh/g) and excellent cycle performance.973项目(2002CB211804); 国家自然科学基金(20373058); 福建省科技项目(2003H044); 厦门市科技计划项目(3502Z2001234)

STRATIGRAPHIC DIVISION, FOSSIL MAMMALS AND ENVIRONMENT of THE PLEISTOCENE IN FUJIAN PROVINCE

本文在广泛调查基础上综合多种学科资料，对福建更新世地层进行划分，比较分析晚更新世哺乳动物组合的性质，结合抱粉资料，提出生态分区，并探讨了当时人类的生活环境。国家自然科学基

A Study of Diversified Curriculum in American Colleges and Universities

在全球化趋势和多样性的社会背景下,美国高校相继进行了多样性课程的探索。本文着重探讨美国高校多样性课程的主要内容、实现方式和实践情况等,同时分析美国高校多样性课程实施的成功因素所在,期望对我国当前的高校课程改革有所借鉴。In the context of globalization and social diversity, diversified curriculum is becoming an important research field in American colleges and universities. This article focuses on contents, channels to accomplish and practice of the diversified curriculum. It also analyzes the elements of a successful process in American colleges and universities in hope of its reference in the reform of China's higher learning curricular

中国桥弯藻科（硅藻门）的新记录植物

本文报道了采自新疆维吾尔自治区的桥弯藻科（硅藻门）中国新记录植物11种3变种,分别为Amphora mexi-canavar.major（Cleve）A.Cleve,Amphora twenteanaKrammer,Encyonema cespitosumK櫣tzing,Encyonema silesiacumvar.ventriformisKrammer,Cymbopleura albanicaKrammer et Miho,Cymbopleura apiculataKrammer,Cymbopleura schwe-ickerdtiiCholoky,Cymbella compacta strup,Cymbella diversaKrammer,Cymbella excisavar.subcapitataKrammer,Cymbella hantzschianaKrammer,Cymbella scutarianaKrammer,Cymbella subhelveticaKrammer,Cymbella vulgataKram-mer。对其分类学特征进行了详细的描述,并给出了它们的生境特征

中国桥弯藻科（硅藻门）的新记录植物

本文报道了采自新疆维吾尔自治区的桥弯藻科（硅藻门）中国新记录植物11种3变种,分别为Amphora mexi-canavar.major（Cleve）A.Cleve,Amphora twenteanaKrammer,Encyonema cespitosumK櫣tzing,Encyonema silesiacumvar.ventriformisKrammer,Cymbopleura albanicaKrammer et Miho,Cymbopleura apiculataKrammer,Cymbopleura schwe-ickerdtiiCholoky,Cymbella compacta strup,Cymbella diversaKrammer,Cymbella excisavar.subcapitataKrammer,Cymbella hantzschianaKrammer,Cymbella scutarianaKrammer,Cymbella subhelveticaKrammer,Cymbella vulgataKram-mer。对其分类学特征进行了详细的描述,并给出了它们的生境特征。</p

THE MAMMALIAN FOSSILS FROM WESTERN TAIWAN STRAIT

本文简要记述了出自台湾海峡西部海域的170件哺乳动物化石，其中的102件分属于urSuSSP，ElEPHASMAXIMuS，dICErOrHInuSSP，CErVuSunICOlOr，CErVuSnIPPOn，SuSSP，和bubAluSbubAluS，时代为更新世晚期；67件属全新世早期，包括CETACEAgEn.ETSP.IdET，ElEPHASSP，SuSSCrOfACErVuSunICOlOr和CErVuSnIPPOn等；属于第三纪晚期的仅有1件鹿超科角化石。台湾海峡西部海域更新世晚期和全新世早期的哺乳动物组合不同于已知的我国海域其他地点的哺乳动物组合，也异于福建中、西部山区的哺乳动物组合。Numerous mammalian Fossils From Western Taiwan Strait were brieFly discri-bed here.Concerning the age, besides an antler of Cervidea dated to late Tertiary,other specimens were suggested to be of late Pleistocene, such as Ursus sp., Elcphasmaximus, Dicerorhinus sp., Sus sp., Cervus unicolor, Cervus nippon and Bubalus bu-balus, and early Holocene, incIuding Cetacea gen.et sp.indet., Elephas sp.Susscrofa, Cervus unicolor and Cervus nippon etc.The Late Pleistocene and Early Holocene Faunal assemblages of Western Tai-wan Strait diFFer From contemporary Faunal assemblages either From other sea areain Cbina or localities at middle-western mountain area in Fujian, they probablyrepresent a local branch of Ailuropoda-Stegodon Fauna occured along the Soutbeasterncoast of China.国家自然科学基

Electrochemical Performances of Fuorinated Polymer Graphite

[中文文摘]对系列氟化石墨及其作为碱性电池正极添加剂的电化学性能进行了研究 ,考察了氟化石墨作为电极活性材料及用作添加剂时电池的放电行为以及氟化石墨的氟化程度和电极中氟化石墨的含量对电池的放电性能的影响 .研究了 Mn O2 中添加氟化石墨后对电极循环性能的影响 ,并用 XRD比较了几种不同碳材料与氟化石墨的结构特点及 Mn O2 电极放电前后的状态变化 ,初步探讨了氟化石墨改善二氧化锰电化学性能的作用机制。[英文文摘]Using FGs(fluorinated polymer graphite) as novel cathode additives for conventional alkaline batteries were investigated. It is demonstrated that FG as a cathode additive in alkaline batteries can improve the discharge performances significantly. The discharge performance of the cells in which the cathode contains a different mass fractions of FG and that contain a fixed mass fraction of FG but with different contents of fluorine in the FG were explored in detail. Furthermore, the electrochemical behavior of pure FG cathode ( i. e. the FG exclusive cathode) w as studied, as well as normal graph ite cathode. The storing stability of the batteries in w h ich the cathode ismade of pure FGs (FG exclusive cathode) or the cathode contained FG as additives w ere exp lored. XRD studies are carried out on fluorinated polymer graph ites and some normal graph ites before and after discharging and the results are discussed.国家自然科学基金(批准号:20373058); 国家“九七三”计划项目(批准号:2002CB211800); 福建省科技项目(批准号:2003H044)资助

四无特性可重构光分插复用器节点设计与测试

针对光网络的智能化发展需求,在自主研制的1×9可变带宽波长选择开关的基础上,设计了一种多维ROADM（可重构光分插复用器）节点,并采用两种固定带宽波长的信号（10Gbit/s和1Tbit/s）对该节点的各项性能进行了测试。实验结果表明:该ROADM节点具备无向、无色、无阻塞和无栅格等四无特征