A multidimensional approach to syntactic pattern recognition

This paper describes a syntactic method for representing the primitive parts of a pattern as nodes of a type of directed graph. A linear representation of the digraph can then be presented to a regular unordered tree automaton for classification. Regular unordered tree automata can be simulated by deterministic pushdown automata, so this procedure can be implemented easily. Regular u-tree automata and the corresponding generative systems, regular u-tree grammars are formally defined. Several results are shown which are applicable to all syntactic pattern recognition schemes involving the use of primitives.     

On languages accepted by space-bounded oracle machines

Characterizations of classes of languages accepted by space-bounded oracle machines are developed. These characterizations are given in terms of the regular sets, certain information about the oracle set, and certain algebraic closure operations.This research was supported in part by the National Science Foundation under Grant MCS77-11360     

关于Abel群的正则完整子半群的一个结果

研究正则完整了半群的若干性质,并由此给出Ａｂｅｌ群是特殊值的几个充要条件。     

寻找多色Ramsey数下界的一个算法

研究了正则的素数阶循环图,提出了计算多色Ｒａｍｓｅｙ数Ｒ（ｑ１,ｑ２,…,ｑｎ）的下界的一个算法,得到４个三色Ｒａｍｅｓｅｙ数的新下界：Ｒ（３,３,１０）≥１０４,Ｒ（３,３,１５）≥２１２,Ｒ（３,３,１６）≥２５８,Ｒ（３,３,１７）≥２８２。     

Symmetry analysis by computer

Approximate locations of axes of symmetry of a 2-dimensional region are detected on the basis of its border. The border, described in terms of certain directional codes, is treated as a regular polygon in a hierarchical manner where a lower level means a greater number of sides. At each level of the hierarchy, the best axis of symmetry is found which for a lower level gives a more accurate position of the unknown axis of symmetry than for a higher level. Along with an axis of symmetry, a certain error is found on the basis of which the degree of symmetry of a 2-dimensional region is defined. Programs are written in FORTRAN IV and are implemented on an EC-1033 computer.     

形质与情性——楷书与草书的艺术特征

文章以唐代孙过庭为研究切入点, 深入剖析了楷书与草书的形质与情性的艺术特征, 对于提升人们的书法知识和鉴赏能力具有一定的促进作用。     

Combined in situ X-ray radiographic observations and post-solidification metallographic characterisation of eutectic transformations in Al–Cu alloy systems

In this study thin Al–Cu hypoeutectic alloys were mounted in a Bridgman furnace and solidified near isothermally from above the liquidus to below the eutectic temperature. The eutectic transformation is easily identified from the X-ray absorption contrast difference between the semi-solid mush and the fully solid phase in the field of view (FOV). By virtue of real time in situ X-radiography, and subsequent image analysis techniques, it was possible to directly observe and accurately measure eutectic nucleation, as well as transformation rate across the FOV. Post-solidified samples were then subjected to further microstructural analysis, whereby the lamellar eutectic spacings were measured at random locations across the FOV region. The lamellar spacings were correlated with the eutectic transformation rate and showed reasonable agreement with theoretical predictions. Some interesting observations, such as, for example, in situ observations of solidification shrinkage and the effect of liquid feeding through the semi-solid mush, are also discussed.     

分条整经条带扩散规律的测试分析

对分条整经卷绕过程中条带扩散变化的程度进行了测试和分析 ,研究表明卷绕过程中经纱条带的自由纱段长度变化是引起扩散程度变化的主要因素 ,经纱条带扩散量的大小还受到经纱细度、经密和整经速度的影响     

应用正规溶液理论计算含水体系液液平衡

本文在正规溶液理论基础上，考虑了混合熵效应和长程静电作用，提出了可用于各种含水体系液液平衡计算的普遍方程，以及分子间作用参数与温度的关系式，关联了具有上会溶温度、下会溶温度和两者同时存在的有机物－水体系的液液平衡数据。该普遍方程可用于含水、有机物和（或）电解质的二元及三元体系液液平衡计算。