运用数字化技术加强档案馆建设

文章从数字档案馆的涵义入手，阐述了运用数字化技术，加强档案馆建设的重要意义。     

有向树图的连通性及其算法

证明了树形图图的连通性，给出了求全部树形图的广探算法。     

An Introduction to System Full-Decomposition Theory

In this paper, the system full-decomposition theory is introduced and its mathematical properties, as an algebraic system, are provided. A partition trinity of the algebra on a machine gives efficiently the information dependence between inputs, states and outputs within a triple of partitions, and they serve as a powerful tool to the full-decompositions of machines. In information processing system, the full-decomposition is especially significant in the case of decompositions related to the pins of VLSI devices.     

正则SM—代数

本文对正则的SM—代数给出一个构造定理。作为这一定理的应用,还给出了次直既约的正则SM—代数和内射SM—代数。     

双曲型黎曼曲面上解析动力系统的周期点

本文讨论双曲型黎曼曲面上解析动力系统周期轨道的存在性及周期点的个数.     

一种二维参数化建筑图库的建立方法

基于AutoCAD2000软件平台，应用VBA工具，开发了一个建筑专用图库，该系统实现了参数化绘图，界面友好，开放性好，便于进一步开放和完善，达到了实用要求。     

电导法测定大气中微量二氧化硫

本文采用电导法对大气中微量二氧化硫的测定进行了系统的研究,并用四氯汞盐-盐酸副玫瑰苯胺比色法与电导法进行对比实验,两者基本吻合.实验结果表明本方法准确,可靠,简便,快速和无毒,同时表明方法精密度和线性关系均令人满意.样品的平均加标回收率为95.85%.     

火焰原子吸收法测定牧草中的钾、钠、钙、镁

将火焰原子吸收法引入到大批量牧草中钾、钠、钙、镁的分析,并将此法与经典分析方法进行了比较,对该法测定牧草的精密度、准确度、干扰及排除等方面进行了探讨。     

采用Paris公式描述缺口表面裂纹扩展速率的条件

通过两种材料的缺口表面裂纹扩展规律的实验研究和非线性有限元的数值计算,指出只有当缺口裂纹冲出缺口的非线性应力场,由线弹性断裂力学所确定的应力强度因子成为裂纹扩展的驱动力时,Paris 公式方可用于表征缺口表面裂纹扩展速率.为工程应用需要,提出当 n′>0.2和表面裂纹长度2c>1mm 时,Paris 公式可以应用于描述缺口表面裂纹的扩展速率.     

A simple structural feature is a major determinant of the identity of a transfer RNA

Analysis of a series of mutants of an Escherichia coli alanine transfer RNA shows that substitution of a single G-U base pair in the acceptor helix eliminates aminoacylation with alanine in vivo and in vitro. Introduction of that base pair into the analogous position of a cysteine and a phenylalanine transfer RNA confers upon each the ability to be aminoacylated with alanine. Thus, as little as a single base pair can direct an amino acid to a specific transfer RNA.