Effect of type of processing on the microstructural features and mechanical properties of Al-Cu/SiC metal matrix composites

In this study, an aluminum based metallic matrix (Al-2wt.% Cu) was reinforced with SiC particulates using a conventional casting technique and a new disintegrated melt deposition technique. Microstructural characterization studies conducted on the samples taken from disintegrated melt deposition technique revealed a more uniform distribution of SiC particulates and good interfacial integrity between SiC particulates and metallic matrix when compared to the conventionally cast composite samples. Results of ambient temperature mechanical tests demonstrate an increase in 0.2% YS and ultimate tensile strength of samples taken from disintegrated melt deposition technique when compared with the unreinforced and conventionally cast composite samples. The results of microstructural characterization and mechanical testing were finally rationalized in terms of the nature of processing technique employed to reinforce Al-2wt.% Cu metallic matrix with SiC particulates.     

MATLAB图像处理在水产养殖中的应用

介绍了一种通过MATLAB图像处理的方法,对水产养殖中鱼的病变情况进行监控的系统。根据中值滤波的原理,对灰度图像进行滤波,抑制噪声;根据二值化原理,将灰度图像进行二值化处理;根据收缩与扩张的原理,编写程序,对二值图像进行数次收缩与扩张,以达到去除杂质点的目的。最后采用区域矩特征的概念,找出判断鱼类出现病变的判断依据,即零阶矩,也就是白色像素的面积,只要统计出白色像素的数目,与统计数据相比较,即可判断出是否出现鱼类病变等异常情况。     

一个地下水流及溶质迁移模拟的图形化方案

本文介绍在地下水饱和系统中，对地下水流和溶质迁移模拟进行计算机图形化处理的方案。     

Annealing process of fine grained co-stabilised (Y,Mg)-PSZ/MgAl2O4 ceramics

Abstract

Co-stabilised (Y,Mg) partially stabilised zirconia (PSZ) ceramics with MgAl₂O₄ spinel additions were produced, with industrial zirconia as the main starting material. Powders were prepared using a mechanical milling–mixing process. The effect of the annealing process on the mechanical properties, phase compositions, and microstructure of fine grained PSZ ceramics was investigated.     

Flexible electronics: Prediction of substrate deformation during different steps of the lithography process

A numerical model was developed to simulate the micro-deformations of a polymeric substrate due to lithographic processing of different layers of a transistor-like structure. The results of the model were validated with the results from experiments. The model, a mechanical-thermal-hygroscopic model, takes into account the dimensional effects of temperature, moisture and stresses. It also includes the temperature dependent visco-elastic behaviour of the polymer substrate. The model can be used to predict overlay accuracies between different functional layers introduced by the lithographic process. It can also be used to understand the underlying processes such that it provides a tool to improve the overlay accuracy during actual processing.     

形态重构算法及应用

本文首先定义了二值图像和灰度图像的形态重构。接着,着重描述了形态重构的实现问题。在简要回顾了经典的并行及串行算法,指出它们的共同缺点是在普通计算机上运行效率不高后,我们提出并实现了两种有效的形态重构算法。第一种算法基于标记图像区域峰顶的概念并采用了先进先出(FIFOP)队列的数据结构;第二种算法是利用第一种算法和串行算法各自优点的一种混合算法。模拟结果证实了算法的有效性。实践证明重构式形态滤波器不仅能达到化简图像的目的,而且能较好地保持图像的轮廓信息,所以应用于图像分割是很合适的。     

多Transputer网络的构造及其流水线操作的实现

介绍了Transputer的特性,着重论述建立多Transputer拓朴互连网络的一般方法,讨论了在多Transputer并行处理网络上实现流水线操作,并给出实例.     

电子设备产品的可靠性试验

可靠性试验是可靠性工程最基本的内容和最重要的工作项目。本文对电子设备产品可靠性试验的技术基础、可靠性试验的特点和分类、电子设备产品可靠性试验的方案设计,以及可靠性试验数据的分析和处理方法作了一些介绍。     

双传感器复合探测时各传感器判决门限的选取和融合方法的讨论

两种性能传感器复合探测系统中,传感器各自的检测门限的确定及选择合理的融合算法是系统设计中的关键问题。通过仿真讨论了虚警率一定时,双传感器复合的融合方法和不同信噪比的下各传感器门限的选取,得出了在虚警率一定时两传感器输出加权平均的融合方法并不优于单传感器,而传感器输出相与的融合方法只要合理选择各自的门限可得到明显优于单传感器的检测性能。     

TMM 10印制电路板制造工艺性研究

本文对TMM10印制板的制造工艺流程进行了重点介绍，对所采用的工艺技术的可行性进行了较为详细的论述。