焊缝及焊接材料中W元素可见光谱快速分析方法研究

使用W484．38nm分析谱线组对部分合金钢焊接材料和焊缝中W元素可见光谱进行了数字化分析测定,探索了W元素可见光谱的数字化处理和分析技术。结果可用于常用合金钢焊接材料和焊缝中W元素的定性分析、定量分析、材料牌号鉴别及焊接部位的冶金状况监测。     

氯化锌电池的一种新结构

本文提出了氯化锌电池的一种新结构,这种结构具有良好的密封效果和抗出水能力,半成品电池可以搁置较长时间而不会影响电性能,因而更能适应多变的市场需要。     

A unifying approach for a class of problems in the computational geometry of polygons

A generalized problem is defined in terms of functions on sets and illustrated in terms of the computational geometry of simple planar polygons. Although its apparent time complexity is O(n ²), the problem is shown to be solvable for several cases of interest (maximum and minimum distance, intersection detection and rerporting) in O(n logn), O(n) or O(logn) time, depending on the nature of a specialized “selection” function. (Some of the cases can also be solved by the Voronoi diagram method; but time complexity increases with that approach.) A new use of monotonicity and a new concept of “locality” in set mappings contribute significantly to the derivation of the results.     

油,气田储量估计的试井分析方法

本文在对油、气田储层的几何结构及钻井位置不做任何假定下，对无流动边界和定压边界两种情形给出油、气田储量估计的试井公式，用本文方法估计储量仅需要少量地质资料和试井数据，特别适宜于在探井阶段提供储量评估。     

求解孙子问题的算法及符号计算软件

本文阐述在计算机上求解孙子问题的算法，并在微机上用符号计算语言ＣＡＳＣ实现了这些算法，软件ＣＨＩＮＲＥＭＤ可对任意大整数情况求解孙子问题。     

Implicit relation-aware social recommendation with variational auto-encoder

World Wide Web - Integrating social networks as auxiliary information shows effectiveness in improving the performance for a recommendation task. Typical models usually characterize the user trust...     

A unifying approach for a class of problems in the computational geometry of polygons

A generalized problem is defined in terms of functions on sets and illustrated in terms of the computational geometry of simple planar polygons. Although its apparent time complexity is O(n ²), the problem is shown to be solvable for several cases of interest (maximum and minimum distance, intersection detection and rerporting) in O(n logn), O(n) or O(logn) time, depending on the nature of a specialized selection function. (Some of the cases can also be solved by the Voronoi diagram method; but time complexity increases with that approach.) A new use of monotonicity and a new concept of locality in set mappings contribute significantly to the derivation of the results.     

Characteristic grain size: Part II measuring principles

The principles for measuring characteristic grain sizes of materials, such as fully-dense single phase materials, porous materials and materials with isolated second phase particles, are developed on the basis of its definition associated closely with the surface area per unit volume, Sv, of grain. The focus of the measuring principles of the characteristic grain size is put on determining Sv of grains. Unlike the measurement of average grain size commonly used, G, correcting factors such as grain shape and grain size distribution factors, will not be applied to the determination of the characteristic grain size, G _c, due to its unique geometric meaning and the measure precision of S _v being guaranteed by quantitative stereological technique and gas adsorption method. The measurement of G _c can be directly carried out on the polished and etched cross section of materials, similar to the measurement of the average grain size using the Heyn intercept method. Project supported by the British Council Academic Link Scheme Synopsis of the first author Cao Shunhua, lecturer, born in Jan. 1965, strong interest in the following research areas: warm compaction, FGMs, prototype design of WC-Co alloys, preparation of β-SiC and sialon powders.     

GPS一机多天线变形监测系统

介绍了作者研制的GPS一机多天线监测系统。GPS已被证明是监测高危边 坡稳定性的一个有效工具，它可以提供比其他测量手段更高的精度。然而，传统的GPS在边 坡监测方面也有其不足，主要在于大规模监测中每个监测点都需要安放GPS接收机，造成成 本过高，因此有明显的局限性。针对以上问题，文中提出了以一台GPS接收机连接监测点上 的多天线序列的新方法，并研制出了专用的多天线转换器。试验结果表明定位精度可达2 mm ～3 mm。     

前馈网的知识扩充及故障恢复

针对前馈网扩充性差的问题,提出了一种知识扩充方法,在维护原有网络结构不同的基础上,通过添加一个新的子风 保存现有的训练结果,又可以学习新知识的目的。同时,本文对神经网络的故障恢复策略进行了研究,提出了相应的补偿算法。最后通过仿真实验仿真实验对算法的有效性进行了验证。