Structure and luminescent properties of YAG : Eu, Bi synthesized by sol-gel method

(Y1-xEux)(3)Al5O12 and (Y1-x-yEuxBiy)(3)Al5O12 were prepared by so-gel method. Their structures of the luminophor are similar to that of YAG, which is recorded on the ASTM card and belongs to a cubic system. The luminescent properties show that the reaction temperature of the current sol-gel method is in the range of 400-500 degrees C, which is lower than that of the conventional solid state reaction. The luminophors have the strongest emission intensity when the values of x and y are 0.06 and 0.013, respectively.

YAG∶Eu~(3+)、Bi~(3+)的溶胶-凝胶法合成及其结构和发光性能

溶胶－凝胶法以其各组分混合均匀性好、反应温度低、节省能源等诸多优点而引起了人们极大兴趣［１，２］．近年来，利用该法研制玻璃和陶瓷等无机材料的报道越来越多［３，４］．但研制稀土固体发光材料的报道则较少．钇铝石榴石Ｙ３Ａｌ５Ｏ１２（ＹＡＧ）是一种很好的基…

Gas transport property of homo- and copolyimides from isomeric thiaphthalic dianhydride and oxydianiline

Gas transport properties of home- and copolyimides prepared from 3,3',4,4'- and 2,2',3,3'-thiaphthalic dianhydride (p-TDPA and m-TDPA, respectively) with 4,4-oxydianiline (ODA) were investigated. The fractional free volume of m-TDPA-ODA is larger than that of p-TDPA-ODA, and the chain segmental mobility of the former is lower than that of the latter. The permeability coefficients of m-TDPA-ODA to H-2, CO2, and O-2 are more increased by 48, 69 and 75%, at 30 degrees C and 10 atm, respectively, than those of p-TDPA-ODA; but the permselectivities of m-TDPA-ODA for H-2, CO2, and O-2 toward N-2 are more decreased by 33, 77, and 26%, respectively, than those of p-TDPA-ODA. The permeability coefficients and the diffusion coefficients of the copolyimides can be described by the following equations: log P = Phi(p) log P-p + Phi(m), log P-m and log D-a = D-a = Phi(p) log(D-alpha)(p) + Phi(m) log(D-a)(m), respectively. The variation of the permselectivity is controlled predominantly by diffusivity selectivity. These observations are interpreted in terms of variations in the fractional free volume of polyimides. (C) 1997 John Wiley & Sons, Inc.

那保胶囊质量标准研究

目的：建立那保胶囊（黄芪、当归、延胡索、白花蛇舌草、铁棒锤等）的质量标准。方法：采用TLC对处方中当归、延胡索及白花蛇舌草进行鉴别,对毒性药材铁棒锤进行限量检查,采用高效液相色谱-蒸发光散射检测器（HPLC-ELSD）法测定黄芪甲苷的含量。结果：TLC鉴别分离度好,专属性强;铁棒锤中乌头碱含量不超过规定;黄芪甲苷在1～10μg的范围内线性关系良好（r=0.9990）,平均回收率为99.05（RSD=2.48,n=6）。结论：所建立的质量标准方法可靠、准确、专属性强,可有效控制那保胶囊的质量。

移动机器人环境建模的结构基自由网格法

本文给出的结构基自由网格法综合了正规栅格法和自由空间法的基本思想,依环境的结构信息确定地解决自由空间分割过程中构造想象边界的任意性问题,由此消除了路径的不确定性;此外,结构基自由网格模型可以在一定程度上消除规划路径“绕大弯”的现象。

河道砂油藏产能预测系统研究

Productivity prediction is a serious factor to oil reservoir management and working out economic plans so that it is paid great attention to all the time. Gudao Oil Field, which has been yielding more than 100 million tons of crude oil accumulatively since it was put into developing in 1970's as a complete set of oil field, now entering double extra high water-bearing period after productivity construction, stable production and depletion stage. It's main layer series of development is thought to be type of channel sand reservoir in east China. Form channel sand reservoir in upper Guantao Group of Shengli Oil Field, there are several large oil fields such as Gudao, Gudong and Chengdao etc. with almost one-third reserves of whole Shengli Oil Field. It is considered the common characteristics in this area would be that the layer is less developed, the sand distribution is sporadic, the connectivity is weak, the heterogeneity is strong in plane, the oil layer is unconsolidated with big porosity, high permeability and serious sanding, and the oil is heavy. Because of the restricted factors to productivity of this kind of reservoir, it is very significant to study the productivity prediction this kind of reservoir. By selecting the upstream fluvial reservoir in Guantao Group of Neogene system as researching object, the author studied the forecasting technology with heterogeneous reservoir. Firstly, the author constructed the 3D subtle geological model quantificationally through researching exploitation geology in the way of combination of dynamic and static methods. Secondly, by the aid of dynamic material obtained while producing, the author analyzed the oil distribution law and influencing factors, then finished dynamic oil reservoir description on the basis of static oil reservoir description. Thirdly, via comparing and analyzing all the forecasting methods of productivity existed, the author developed a set of method to forecast productivity of single well and oil field which fit to channel sand reservoir. At last, under the support of ORACLE database, with the advanced computer technology, the author programmed the software called 'Channel Sand Reservoir Prediction System'. Up to now, this system has been putting into use in Gudao Oil Field and very successful.

喀斯特高原湖泊生物地球化学过程中的锌同位素特征

采用多接收电感耦合等离子体质谱仪（MC-ICP-Ms）对喀斯特高原湖泊红枫湖、阿哈湖水体及其主要支流水体悬浮物和一些生物样品中的锌同位素进行了测定，测试精度小于0．11％。（2SD）。结果显示，红枫湖水体与其主要支流水体悬浮物中的δ^66Zn变化范围分别为-0.29‰～0.26‰和-0.04‰～0．48‰，阿哈湖水体与其主要支流水体悬浮物中的δ^66Zn变化范围分别为-0．18‰～0．27‰和-0．17‰～0.46‰，均表现出支流中的锌同位素组成较重的特点。两湖生物样品中的δ^66Zn变化范围较大，为-0．35‰～0．57‰，说明湖泊生态系统中各端员的锌同位素组成存在一定差异。根据同位素组成分析，湖泊主要入湖河流及所携带的陆源物质是阿哈湖？白水体中锌的主要来源，锌同位素是一种较好的物源示踪工具。红枫湖夏季δ^66Zn与Chla（叶绿素）呈显著的正相关（R=0. 97），主要是藻类对锌的有机吸附和吸收过程导致锌同位素组成发生变化。此外，湖泊水体悬浮物中的锌同位素组成均在夏季较轻，表明大气的干湿沉降可能是一个较负的锌同位素源。水体悬浮物中的δ^66Zn变化范围小于生物样品中的δ^66Zn变化范围，说明由于生物作用过程导致的锌同位素分馏大于非生物过程.