Mg,Ca,Y,La和Ce在Ni3Al中的合金化行为

利用Ｘ射线衍射法确定了合金元素Ｍｇ，Ｃａ，Ｙ，Ｌａ及Ｃｅ在Ｎｉ３Ａｌ中的合金化行为。结果表明，Ｍｇ，Ｃａ，Ｙ，Ｌａ及Ｃｅ原子占据Ｎｉ３Ａｌ中的Ａｌ位，并按以下顺序增加Ｎｉ３Ａｌ的有序度：Ｍｇ，Ｃａ，Ｙ和Ｌａ－Ｃｅ。随着合金元素含量的增加，Ｎｉ３Ａｌ的点阵常数亦按Ｍｇ，Ｃａ，Ｙ，Ｌａ－Ｃｅ的顺序呈线性增大。     

Au－Cu合金的微观结构和性质

依据建立在统计热力学和金属电子理论基础上的合金综合理论──合金相的特征晶体理论，对Ａｕ－Ｃｕ合金的微观结构和性质进行了研究．确定了特征性质（势能和体积）的相互作用方程，各特征原子的电子结构及演变特点；计算了合金的形成热、混合Ｇｉｂｂｓ自由能和晶格常数随成分的变化．这些性质的理论值和实验值符合很好。     

格蕴涵代数的软LI-理想

借助软集合,提出了格蕴涵代数的软LI-理想的概念,研究了软集运算下的一些诸如交、且等基本性质,并给出了格蕴涵代数的软LI-理想的一些等价刻画。此外,研究了格蕴涵代数的软LI-理想与格蕴涵代数的软格理想之间的关系。得到了格蕴涵代数的软LI-理想像与原像的性质。     

藏文文字特征提取方法的研究

特征提取是文字识别中很重要的环节。藏文字识别中特征提取的方法有很多,但由于藏文字的字型有很多种特点,可以探索出适合藏文识别的最优特征提取方法。该文简述了藏文字型的特征及印刷体藏文字识别原理,主要讨论了符合藏文字的一种特征提取方法--网络点阵图形投影法。     

Complete controllability for abstract measure differential systems

In this paper, we investigate the complete controllability for abstract measure differential systems. Firstly, we introduce several new concepts about complete controllability for abstract measure differential systems. Then, on the basis of the Sadovskii fixed‐point theorem, we give sufficient conditions for complete controllability for a class of abstract measure differential systems. The compactness of the semigroup generated by some operator is unnecessary in this paper, and we show that our results, dealing with complete controllability problem for an ordinary differential system in infinite‐dimensional Banach space, are also less conservative than that in the previous literature. Copyright © 2012 John Wiley & Sons, Ltd.     

多功能全悬臂模板的设计及应用效果

根据桥巩水电站工程混凝土浇筑的施工特点,设计出一种实用新型多功能全悬臂大型钢模板,其应用效果显著.通过对模板体系的合理设计和关键杆件的分析计算,确保模板结构安全,使用方便,达到了混凝土外观质量提高、节约施工成本、加快了施工进度等较好的技术经济效果.     

新虚拟场景模型下智能漫游算法设计与实现①

基于对相关智能预测算法的分析,发现现有算法并未考虑到虚拟场景节点间存在的潜在关联关系,降低了算法的预测准确率。针对此问题,在一种新的立方体虚拟场景模型的基础上,提出了一种智能漫游算法,通过为每个节点建立一个以当前节点为根结点的完全二叉树结构,利用节点间潜在的关联关系判断下一步可能被操作的对象,对预测对象提前进行绘制并调入内存,有效弥补了相关算法存在的缺陷,从而提高了虚拟场景漫游的效率和实时性,算法具有较高的准确性。     

公交车站牌报站屏的设计

介绍了新型太阳能公交车站牌报站显示系统。该系统利用太阳能、LED显示和微控制技术,采用W78E58单片机作为系统的中央控制单元,可实现同一站牌不同路数公交车站点的静态显示、动态显示和定时显示控制。利用VB软件编程可实现PC机通信,通过RS232接口可对整个系统升级,提高了系统的可操作性。整个系统采用太阳能供电,蓄电池作为后备电源,可有效节约电能。     

Thermodynamic modeling of the Na–Al–Ti–H system and Ti dissolution in sodium alanates

Thermodynamic assessments were made to optimize thermodynamic models and parameter fits to selected experimental and first principles hypothetical predicted phase data within the Na–Al–Ti–H system. This enabled thermodynamic modeling of Ti solubility within the sodium alanates: NaAlH₄ and Na₃AlH₆, and the relative stability of Ti-bearing phases. The modeling provides insights into the role of Ti originating from Ti-based activating agents commonly referred to as ‘catalysts’ in promoting reversibility of the Na–Al–H dehydrogenation and rehydrogenation reactions under moderate temperature and pressure conditions relevant to H storage applications. Preliminary assessments were made to evaluate H solubility in bcc-Ti and hcp-Ti, and stability of the hydride δ-TiH₂. To model possible Ti dissolution in NaAlH₄ and α-Na₃AlH₆, sub-lattice models were applied. A repulsive interaction is predicted by first principles calculations when Ti is dissolved in NaAlH₄ or α-Na₃AlH₆, which becomes stronger with increasing temperature. Although Ti is virtually insoluble in NaAlH₄ or α-Na₃AlH₆, a small addition of TiCl₃ will induce a thermodynamic driving force for formation of TiH₂ and/or TiAl₃. The addition of pure Ti shows a weaker effect than TiCl₃ and leads to formation of TiH₂ only. Based on a combined interpretation of present thermodynamic modeling and prior experimental observations, the TiAl₃ and TiH₂ phases are ascribed to have a catalytic effect, not a thermodynamic destabilization effect, on the reversibility of the dehydrogenation/rehydrogenation reactions in the Na–Al–H system.     

Partial Partitions,Partial Connections and Connective Segmentation

In connective segmentation (Serra in J. Math. Imaging Vis. 24(1):83–130, [2006]), each image determines subsets of the space on which it is “homogeneous”, in such a way that this family of subsets always constitutes a connection (connectivity class); then the segmentation of the image is the partition of space into its connected components according to that connection. Several concrete examples of connective segmentations or of connections on sets, indicate that the space covering requirement of the partition should be relaxed. Furthermore, morphological operations on partitions require the consideration of wider framework. We study thus partial partitions (families of mutually disjoint non-void subsets of the space) and partial connections (where connected components of a set are mutually disjoint but do not necessarily cover the set). We describe some methods for generating partial connections. We investigate the links between the two lattices of partial connections and of partial partitions. We generalize Serra’s characterization of connective segmentation and discuss its relevance. Finally we give some ideas on how the theory of partial connections could lead to improved segmentation algorithms.