“非汉字符号”与“附加能量”关系的讨论

本文给出了 L-S耦合态下的原子 ,在弱磁场中其附加能量与拉莫尔旋进角速度间的定量关系     

论有限变形梯度的和分解

本文证明了有限变形梯度的和分解一般是不唯一的,当考虑尺规变换时,也只有在拖带坐标系由正交系变为正交系的特殊情形下才能对1+(?)实现唯一的和分解。     

Outliers,level shifts,and variance changes in time series

Outliers, level shifts, and variance changes are commonplace in applied time series analysis. However, their existence is often ignored and their impact is overlooked, for the lack of simple and useful methods to detect and handle those extraordinary events. The problem of detecting outliers, level shifts, and variance changes in a univariate time series is considered. The methods employed are extremely simple yet useful. Only the least squares techniques and residual variance ratios are used. The effectiveness of these simple methods is demonstrated by analysing three real data sets.     

正炔烃结构性能关系的理论探讨：加和型性能

本文首次从理论上系统探讨了正炔烃加和型性能与其分子结构间的关系,提出了一个结构基础明确的、适用于正炔烃加和型性能的定量关系P=a+bN+cexp(-λW_k~(2/3))式中P为加和型性能,N和W_k分别为分子结构的一级和二级结构信息指数,a,b,c,λ是与性能P有关的常数。对大量正炔烃摩尔折射度和摩尔体积的计算结果表明,计算值十分接近实验值,对摩尔折射度和摩尔体积计算结果的平均相对误差分别为0.017%和0.015%。因此,应用本文定量关系,不仅能够预测正炔烃的加和型性能,而且有助于揭示物质结构性能关系之间的奥秘。     

中草药饲料添加剂研究的历史与现状

本文从中草药饲料添加剂研究兴起的背景、中草药饲料添加剂的起源、目前研制应用的特点及存在的问题和今后研究的方向等几方面较详细地进行了综述。     

A graph-theoretic method for organizing overlapping clusters into trees,multiple trees,or extended trees

A clustering that consists of a nested set of clusters may be represented graphically by a tree. In contrast, a clustering that includes non-nested overlapping clusters (sometimes termed a “nonhierarchical” clustering) cannot be represented by a tree. Graphical representations of such non-nested overlapping clusterings are usually complex and difficult to interpret. Carroll and Pruzansky (1975, 1980) suggested representing non-nested clusterings with multiple ultrametric or additive trees. Corter and Tversky (1986) introduced the extended tree (EXTREE) model, which represents a non-nested structure as a tree plus overlapping clusters that are represented by marked segments in the tree. We show here that the problem of finding a nested (i.e., tree-structured) set of clusters in an overlapping clustering can be reformulated as the problem of finding a clique in a graph. Thus, clique-finding algorithms can be used to identify sets of clusters in the solution that can be represented by trees. This formulation provides a means of automatically constructing a multiple tree or extended tree representation of any non-nested clustering. The method, called “clustrees”, is applied to several non-nested overlapping clusterings derived using the MAPCLUS program (Arabie and Carroll 1980).     

Additive two-mode clustering: The error-variance approach revisited

The additive clustering approach is applied to the problem of two-mode clustering and compared with the recent error-variance approach of Eckes and Orlik (1993). Although the schemes of the computational algorithms look very similar in both of the approaches, the additive clustering has been shown to have several advantages. Specifically, two technical limitations of the error-variance approach (see Eckes and Orlik 1993, p. 71) have been overcome in the framework of the additive clustering. The research was supported by the Office of Naval Research under grant number N0014-93-1-0222 to Rutgers University. The authors are indebted both to Fionn Murtagh, who served as Acting Editor, and to anonymous Referees for thoughtful and constructive reviews.     

自然数集的（a,b,k）型可加划分

本文对自然数集的(a,b,K)型可加划分作了一般性讨论,分别得出了:N的(1,b,k)型可加划分的个数,N的(2,b,k)型可加划分的个数;N的(a,a,k)型可加划分的个数。     

碱性锌系列二次电池中无汞多孔锌电极

研究添加少量Bi_2O_3、乙炔黑(AB)对多孔锌电极在碱性溶液中的阳极行为,电结晶形态及自放电速率的影响,得出采用复合添加剂对改善锌电极的性能具有显著的效果,在电流密度为100～400mA/cm~2下,放电性能优于含HgO锌电极,且适于在强电流密度放电,同时,用微电极技术研究,发现添加Bi_2O_3可提高成核速率,改变沉积形态,实验表明,添加Bi_2O_3可减少电极的变形,提高循环寿命;能有效地减缓电极的钝化,防止单电池的反极现象并可抑制因添加AB而引起析氢速率加快的作用。因此,对二次电池特别储备电池具有明显优点和实用价值。     

石膏基复合饰面板的研究

本文进行了以石膏为主要原料生产石膏基复合饰面板的研究 ,找出了生产该复合饰面板的最佳参数 ,并测试了该复合饰面板的有关性能。研究结果表明 ,以石膏为主要原料可生产出性能好的复合饰面反 ,是优良的室内装修材料 ;该材料生产成本低 ,具有十分广阔的市场