元素星系化学演化的分析解

利用瞬时循环近似，考虑元素产率随金属丰度的变化，得出了主要金属元素星系化学演化的分析解，结合恒星核合成结果，计算了银河系中O元素、Mg元素、Na元素、Sc元素等丰度随金属丰度的变化规律，并与观测结果进行了比较。     

经验过程的Cesaro大数定律

给出经验过程Ｃｅｓａｒｏ大数定律成立的充要条件，建立Ｈｅｉｎｋｅｌ的结果在经验过程中的相应形式     

实(复)数域上多元三次多项式可分解的一个充要条件

运用统一的方法对实数域和复数域上的多元三次多项式的分解问题加以讨论。首先把多元三次多项式表示为矩阵的乘积形式，然后给出实（复）数域上多元三次多项式可分解的充分必要条件－存在满足一定条件的对称实（复）矩阵，并给予证明，同时给出分解的方法及例子说明。     

THE WEAK BENSON PROPER EFFICIENT SUBGRADIENT AND THE OPTIMALITY CONDITIONS OF SET-VALUED OPTIMIZATION

1 IntroductionIt is wel1 known that Hahn-Banach theo1.em is one of the basic theorems in functionaIanalysis. It has been extended to vector function, under efficiency by Shi[1] and Wang[2]in ordered vector spacest alld, under strong cone efficiency to set-valued maPping by Chenand Wang(3l. Receatly, Mengt4] and LiI5] has extended it to set--valued mapping with weakefficiency. Generally speaking, weak efficiency has too wide a scope for the decider to obtain afinal choice, so several prope…     

国产Lc4超高强度铝合金材料制造高压缸筒的研究

简要介绍了在引进和消化进口液压胀裂机的过程中，以国产Lc4超高强度铝合金材料为基础，通过调整和控制各种化学成分的配比和优化时效工艺参数的方法取代进口材料制造高压罐筒的研究方法，并给出一些关键的工艺参数。     

A NEW STABILIZED FINITE ELEMENT METHOD FOR SOLVING THE STOKES AND NAVIER-STOKES EQUATIONS PART I. THE LINEAR CASE

1 IntroductionDuring the past decade, many stabilized finite element methods were designed for solvingproblems arising from fluid and solid mechanics. For example, the Navier--Stokes problem hasbeen playing an active role in the development of stabilized methods, e.g. see [1--6], etc andreferences therein. It is well known that the standard GaJerkin method for the Navier--Stokesproblem is subject to two main obstacles. One comes from the high Reynolds nUmber or highadvection, or the limiti…     

Simultaneous Determination of Trace Rare Earth Elements and Other Elements in High Purity Terbium Oxide (Tb4O7) by ICP-AES After HPLC Separation Using P507 Resin

This article describes a new method for the simultaneous determination of trace rare earth elements (REEs) and non rare earth elements (NREEs) in high purity terbium oxide by ICP-AES after HPLC separation using P507 resin. The chromatographic separation of the analytes from the matrix using dilute nitric acid as mobile phase was studied. The experimental results showed that a favorable separation of trace metals (Cu and Gd) from the matrix (Tb) can easily be achieved by elution with dilute nitric acid within 25 min. The proposed method was applied to the determination of trace metals (Ca, Cu, Mg, Mn, Ni, Si, La, Ce, Pr, Nd, Sm, Eu and Gd) in high purity terbium oxide. The detection limits (DLs) for the analytes ranged from 0.4-4.0 μg\5g-1, and the recoveries are from 78%-105%.     

中药产品中的重金属元素

中药产品中的重金属元素超标问题是制约我国中药产品走向世界的一个重要因素。本文对建立我国中药产品中重金属元素检测的国家标准方法和限量控制标准的重要性；研究中药产品中重金属元素超标的原因及对策的方法、途径、重要意义；中药产品中重金属元素存在状态研究的重要意义做了较为详细的论述。     

移动通信本地网管系统解决方案

针对我国移动通信本地网络运行维护的需要，构筑了高效的开放性网管平台框架，其中定义了虚拟网元以及扩充网元概念，和以此为基础的网络拓扑图的设计，同时对告警实行相关性分析和分配及产生派工单，提高了网络管理效率。     

The Systematic Analysis and Assessment of the Environmental Element on Construction Items

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