稀土镁合金覆盖熔剂作用机理研究

采用力学性能测试、金相显微镜、DTA/TG热分析、X射线衍射物相分析和EDAX分析技术研究了传统覆盖熔剂RJ2和自制覆盖熔剂FGJ对含铈AZ91镁合金的显微组织和力学性能的影响作用.结果表明:含铈AZ91镁合金采用覆盖熔剂FGJ熔炼后,Mg17Al12相得到改善,晶内出现Al4C3形核质点,促进了晶粒细化,提高了合金的抗拉强度、屈服强度及延伸率,且拉伸断口形貌呈现河流花样,韧窝也更深,综合性能也比传统覆盖熔剂RJ2更好.     

覆盖粗糙近似的一致性研究

经典粗糙集理论知识的表现形式为论域上的划分,覆盖是比划分更一般的知识表现形式。为了扩展粗糙集理论的应用领域,有必要将粗糙集理论扩展到覆盖近似空间。覆盖近似空间下的概念近似是基于覆盖近似空间知识获取的关键。针对精确概念和模糊概念,研究者定义了不同的近似方法。通过对当前的近似算子进行研究,发现了它们的不一致,并从两个角度对近似算子的定义进行了修正,从而使得它们分别与原有的算子保持一致。所得结论为覆盖近似空间下的概念近似提供了新的研究途径。     

连铸碱性中间包覆盖剂的实验室研究

本文介绍了包钢连铸中间包覆盖剂配方的设计思路及设计原则，并对所设计的碱性中间包覆盖剂的各种物化性能，测试方法作了介绍，表明这种碱笥覆盖剂保温性能好，同时具有较强的防止钢液二次氧化及吸收Ａ１２Ｏ３等非金属夹杂的能力，对中间包内衬及长水口侵蚀也较小。     

高炉风口铸造工艺改进

介绍了高炉风口在铸造中遇到的问题和解决方法，讨论了降低气孔、针孔的工艺措施。     

高烈度区土（石）坝震损特征与成因初步研究

通过实地调查和收集“5·12”汶川8.0级地震后四川岷江、绵阳、安县等高烈度区（7°以上）大、中、小典型土（石）坝坝体变形、坝基地质条件、大坝几何参数等资料，对建筑物的震损裂缝分别进行相关分析，认为坝体裂缝成因除了与地震波直接有关外，其震损程度还与坝轴线的方向和区域应力方向关系密切；而裂缝的分布部位则与坝基覆盖层的分布范围、厚度、性状，坝体的材料、几何尺寸、风浪和动物活动掏蚀等有关，为我国西南水利水电工程建设、深覆盖层的利用、防渗材料的选择和抗震设计研究积累了难得的经验。     

示例学习的扩张矩阵理论

本文提出示例学习的一种计算理论,扩张矩阵论.根据这个理论,示例学习中一些主要最优化问题被证明是NP难题,并给出这些难题的近似解法及下界的估计.     

A three-phase methodology for developing or evaluating bank networks

One basic characteristic of modern society, besides the fast spread of information, is the increased use of banking services in order to fulfil consumer needs. Apart from their income, modern consumers rely to an increasing extent on banking services and money transactions as well, in order to buy consumer products and cover their financial needs. Thus the new standards of the ‘consumer society’ significantly affect the role and the importance of banking services. The end of the monopoly era characterized by increased competition leads banks to modify their strategies, to provide more and better services, to reorganize their structure and expand or merge their networks. In this context we propose a three‐phase methodology for developing and/or evaluating banking networks. The above methodology calculates an ‘attractiveness index’ for each area, and combines geographic information systems with demand covering models so as to propose the best network structure.     

Refining the In-Parameter-Order Strategy for Constructing Covering Arrays

Covering arrays are structures for well-representing extremely large input spaces and are used to efficiently implement blackbox testing for software and hardware. This paper proposes refinements over the In-Parameter-Order strategy (for arbitrary t). When constructing homogeneous-alphabet covering arrays, these refinements reduce runtime in nearly all cases by a factor of more than 5 and in some cases by factors as large as 280. This trend is increasing with the number of columns in the covering array. Moreover, the resulting covering arrays are about 5 % smaller. Consequently, this new algorithm has constructed many covering arrays that are the smallest in the literature. A heuristic variant of the algorithm sometimes produces comparably sized covering arrays while running significantly faster.     

敷设不同覆盖层圆板结构水下抗爆响应特性

在舰船壳体湿表面敷设柔性覆盖层是一种能有效提高其抗冲击性能的方法。多孔蜂窝覆盖层受爆炸冲击波载荷作用后胞元孔壁易于压溃,有效地分散冲击波能量,大幅度减少响应前期阶段的入射冲量,屈曲变形会吸收大量能量。水下爆炸试对于揭示模型的抗冲击机理起着重要的作用。总结对敷设不同覆盖层-圆板结构的水下爆炸响应特性的试验研究。考察有无柔性覆盖层对结构响应的影响,同时解释水下冲击波、气泡对柔性覆盖层的作用过程及覆盖层的抗冲机理。     

12th International Conference on Electronic Measurement ＆ Instruments （ICEMI＇2015）

正Qingdao,China7.16-19,2015The International Conference on Electronic MeasurementInstruments(ICEMI)is the world's premier conference dedicated to the electronic measurement and test of devices,boards and systems that is covering the complete cycle from design,verification,test,diagnosis,failure analysis and process of manufactory and products improvement,and is convened every two years.The purpose of the ICEMI is to provide excellent opportunities for scientists,engineers,and participants throughout the world to present the latest research results and to