(Ce_(0.8)RE_(0.2))_(1-x)M_xO_(2-δ)固体电解质的溶胶-凝胶合成及其电性质

利用溶胶 凝胶法合成了 (Ce0 .8RE0 .2 ) 1-xMxO2 -δ(RE :稀土 ,M :碱土 )系列固体电解质 ,XRD表明 80 0℃即形成萤石结构 ,较高温固相反应合成温度低约 70 0℃ .测定了样品的电导率和阻抗谱 .XPS测试表明 ,掺杂碱土氧化物后吸附氧浓度明显增大 ,氧空位增多 ,电导率和氧离子迁移数增大 ,改善了CeO2 基固体电解质的性能 .讨论了碱土及稀土离子对电性质的影响 .(Ce0 .8Sm0 .2 ) 1-0 .0 5 Ca0 .0 5 O2 -δ80 0℃时电导率0 1 2 6S·cm-1,氧离子迁移数 0 .99.

BaCe_(0.8)Ln_(0.2)O_(2.9)(Ln=Gd,Sm,Eu)固体电解质的低温制备及其燃料电池性质

利用溶胶 凝胶法低温合成了BaCe0 .8Ln0 .2 O2 .9(Ln =Gd ,Sm ,Eu)固体电解质 ,X射线粉末衍射表明 90 0℃即形成正交钙钛矿结构 ,较高温固相反应合成温度降低了约 6 0 0℃ .测定了样品的阻抗谱和电导率 ,研究了其导电机理 ,溶胶 凝胶法合成可减小或消除固体电解质的晶界电阻 ,80 0℃时BaCe0 .8Gd0 .2 O2 .9的σ =7.87× 10 -2S·cm-1,以它为电解质的氢氧燃料电池开路电压接近 1V ,最大输出功率密度为 30mW·cm-2 .

La_(0.2)Ca_(0.8)MnO_3催化剂活性相的结构和形成机理

利用TG，DTA，XRD和XPS方法研究了La0.2Ca0.8MnO3催化剂的结构和形成机理．样品用La，Ca，Mn混合硝酸盐制备．随着焙烧温度的升高发生了一系列的固相反应，发现氨氧化催化剂催化活性与生成的CaMnO3含量成正比．在900℃制备的含有CaMnO3，La0.575Ca0.425MNO3，Mn2O3和La2O3的混合物是氨氧化最佳催化剂，活性相是CaMnO3，并具有大量的氧空穴.

Comparative study on the doping effect of 3d elements in Bi(1.5)Pb(0.2)Sr(2)Ca(2)Cu(2.8)M(0.2)O(y) (M=Sc,Ti,V,Cr,Mn,Fe,Co,Ni, or Zn)

With XRD, R-T, and ac chi measurements a comparative study on the doping effects of 3d elements in Bi(1.5)Pb(0.2)Sr(2)Ca(2)Cu(2.8)M(0.2)O(y) (M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, or Zn) has been carried out. The effects of the former five members are significantly different, both on phase formed and on T-c, from the latter four. It seems that the effect on phase stabilization correlates with the valency of the doped cation. In connection with the instability of the 2223 phase, the correlation has been discussed.

SYNTHESIS, CHARACTERIZATION AND CATALYTIC BEHAVIOR OF LA2-XSRXCOO4+/-LAMBDA (X=0-2) IN COMPLETE OXIDATION

A series of mixed oxides La2-xSrxCoO4+/-lambda (x=0-2) with varying x values was synthesized. The crystal structure of this series of mixed oxides was studied by using XRD. The result showed that when x=0.25-1.5 the mixed oxides possessing K2NiF4 structure are formed. The valences of the transition metal Co and the relation between +/-lambda content and x value by using chemical analysis method have been measured, too. The redox property of this series of mixed oxides and different kinds of oxygen species were studied by IR, TPD, TPR, XPS and SEM methods. The catalytic activity in the complete oxidation of CO and CH4 was investigated and the relationships between the activity, composition and structure of the mixed oxides have been elucidated.

La_(2—x)Sr_xCoO_4±λ(x=0～2)的合成,表征和完全氧化催化性能的研究

合成了x值不同的La_(2-x)Sr_xCoO_4±λ(x=0～2)系列复合氧化物.用XRD研究了这一系列氧化物的晶体结构,结果表明x在0.25～1.5之间可形成具有K_2NiF_4结构的复合氧化物.用化学分析方法测定了过渡金属Co的价态和±λ含量与x值的关系.用IR,TPD,TPR,XPS,SEM等方法研究了这类复合氧化物的氧化还原性能,所含不同氧种,考察了对CH_4,CO的完全氧化活性,并对其活性与化学组成及结构间的关系进行了讨论.

类氖等电子序列的高激发态结构(J=0、2,奇宇称)

本文用本征通道量子亏损理论(EQDT),研究了J=0、2,奇宇称情况下的类氖等电子序列的高激发态结构。得到了NeⅠ—ⅤⅩⅣ的本征通道量子亏损参数(μ_α、U_(1α)),计算了这些类氖体系的全部J=0、2奇宇称Rydberg能级和通道混合系数,并从静电相互作用与自旋-轨道相互作用之间的竞争的角度对结果进行了讨论。能级计算结果与已有的实验值吻合得很好(精度在10~(-6)—10~(-7)数量级)。

支持WSRP 2.0规范的联邦门户的设计与实现

门户（Portal）是基于组件的web应用，它可以集成Internet环境下各种现有应用系统、数据资源和网络信息资源，并为用户形成个性化的访问页面，实现信息的集成和发布。Portlet是门户中的可重用组件，能够提供对web内容、应用程序和其他资源的访问。JSR168规范（Portlet 1.0）和JSR286规范（Portlet 2.0）提供了Portlet的标准。 随着门户的广泛使用，门户已经成为获取信息，巩固和整合IT基础设施的平台。于是来自于同一公司的、自主的、分散的多个部门都部署了自己的门户，但这些门户之间却无法进行内容共享，即Portlet在门户之间的集成。于是出现了联邦门户（Federated Portals），它是由多个分散的门户构成的网络，这些门户基于共同的标准协同工作。联邦门户实现了在异构门户之间共享远程内容，这些远程内容来自于名为生产者的门户，被收集、组合和运行在名为消费者的门户中。 联邦门户的基本特征是基于规范实现跨门户的系统联合。因此联邦门户的关键在于对门户间互操作标准的制定。这个标准就是OASIS推出的WSRP（Web Services for Remote Portlets）规范。WSRP规范提供了门户间互操作标准，成为联邦门户的基础技术。它有1.0和2.0两个版本，分别产生于2003年和2008年。 为了提高联邦门户应用的构建效率，增强异构门户互操作性的能力，完善联邦门户的用户友好性，需要为OncePortal提供支持WSRP 2.0规范的联邦门户。 本文从WSRP 2.0规范和联邦门户的需求出发，设计并实现了支持WSRP 2.0规范的联邦门户。首先根据WSRP 2.0规范对远程Portlet的语法模型、交互模型和生命周期模型三个方面进行特征分析；其次总结了联邦门户的核心功能、系统边界，并给出了联邦门户的设计；然后从Portlet URL的生成与改写、Portlet统一协作框架、远程Portlet资源服务、WSRP容器和代理容器以及Portlet缓存共5个方面介绍了联邦门户的关键技术；最后基于以上分析和设计，实现了联邦门户扩展应用，并将其应用在中科院软件所自主研发的门户产品OncePortal中。

Electrochemical hydrogen storage in (Ti1-xVx)(2)Ni (x=0.05-0.3) alloys comprising icosahedral quasicrystalline phase

For (Ti1-xVx)(2)Ni (x = 0.05,0.1,0.15,0.2 and 0.3) ribbons, synthesized by arc-melting and subsequent melt-spinning techniques, an icosahedral quasicrystalline phase was present, either in the amorphous matrix or together with the stable Ti2Ni-type phase. With increasing x values, the maximum discharge capacity of the alloy electrodes increased until reached 271.3 mAh/g when x = 0.3. The cycling capacity retention rates for these electrodes were approximately 80% after a preliminary test of 30 consecutive cycles of charging and discharging.

锰含量对LiNi_(0.85-x)Co_(0.15)Mn_xO_2结构及形貌的影响

采用共沉淀法先合成出氢氧化物前驱体Ni0.85-xCo0.15Mnx(OH)2,其中X=0、0.1、0.2和0.4,前驱体与Li2CO3在空气气氛中固相烧结制得正极材料LiNi0.85-xCo0.15MnxO2。用XRD、SEM研究了锰含量对材料结构和形貌的影响。研究发现,LiNi0.85Co0.15O2的X射线衍射图中存在微量第二相,而锰掺杂有利于减小反应过程中锂离子损失和镍离子占据锂位,容易形成有序层状结构材料。随着Mn离子替代Ni离子量的增加,晶胞参数a减小,晶胞参数c、c/a及I003/I104值增大。SEM结果表明前驱体和最终产物形貌均随锰含量增加颗粒均匀性增强,粒子尺寸变小,粒径分布变窄。

Growth and characterization of high-quality LiAlO2 single crystal

g-LiAlO2 single crystal is a promising substrate for GaN heteroepitaxy. In this paper, we present the growth of large-sized LiAlO2 crystal by modified Czochralski method. The crystal quality was characterized by high-resolution X-ray diffraction and chemical etching. The results show that the as-grown crystal has perfect quality with the full width at half maximum (FWHM) of 17.7-22.6 arcsec and etch pits density of (0.3-2.2) x 10(4) cm(-2) throughout the crystal boule. The bottom of the crystal boule shows the best quality. The optical transmission spectra from UV to IR exhibits that the crystal is transparent from 0.2 to 5.5 mu m and becomes completely absorbing around 6.7 mu m wavelength. The optical absorption edge in near UV region is about 191 nm.

利用微量热法研究Cd~(2+)和Cu~(2+)对嗜热四膜虫(Tetrahymena thermophila)的毒性效应

利用微量热法研究Cd2 + 和Cu2 + 对嗜热四膜虫BF5(TetrahymenathermophilaBF5)生长代谢毒性效应 ,结果表明 :①低浓度的Cd2 + (0～ 0 .4mgL-1)和Cu2 + (0～ 10mgL-1)对四膜虫的生长有促进作用 ,而高浓度的Cd2 + (0 .8～ 3.2mgL-1)和Cu2 + (2 0～ 2 0 0mgL-1)则产生抑制作用 ;②Cd2 + 和Cu2 + 的半抑制浓度IC50 分别为 2 .0 4mg/L和15 5 .5mg/L ;③联合毒性为协同作用

Elevated levels of urinary 8-hydroxy-2'-deoxyguanosine in male electrical and electronic equipment dismantling workers exposed to high concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans, polybrominated diphenyl ethers, and polychlorinated biphenyls

To investigate the occupational exposure levels to polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), polybrominated diphenyl ethers (PBDEs), and polychlorinated biphenyls (PCBs), indoor dust (n = 3) in workshops and hair samples from male workers (n = 64) were collected at two electrical and electronic equipment waste (E-waste) dismantling factories located in the LQ area in east China in July 11-13, 2006. Pre- and postworkshift urines (64 of each) were also collected from the workers to study oxidative damage to DNA using 8-hydroxy-2'-deoxyguanosine (8-OHdG) as a biomarker. The concentrations of PCDD/Fs, PCDD/F-WHO-TEQs, PBDEs, PCBs and PCB-WHO-TEQs were (50.0 +/- 8.1) x 10(3), 724.1 +/- 249.6, (27.5 +/- 5.8) x 10(6), (1.6 +/- 0.4) x 10(9), (26.2 +/- 3.0) x 10(3) pg/g dry weight (dw) in dust, and (2.6 +/- 0.6) x 10(3), 42.4 +/- 9.3, (870.8 +/- 205.4) x 10(3), (1.6 +/- 0.2) x 10(6), 41.5 +/- 5.5 pg/g dw in hair, respectively. The homologue and congener profiles in the samples demonstrated that high concentrations of PCDD/Fs, PBDEs, and PCBs were originated from open burning of E-waste. The 8-OHdG levels were detected at 6.40 +/- 1.64 mu mol/mol creatinine in preworkshift urines. However, the levels significantly increased to 24.55 +/- 5.96 mu mol/mol creatinine in postworkshift urines (p < 0.05). Then, it is concluded that there is a high cancer risk originated from oxidative stress indicated by the elevated 8-OHdG levels in the E-waste dismantling workers exposed to high concentrations of PCDD/Fs, PBDEs, and PCBs.