基于拓扑分析的多层通道布线算法

本文提出了一种基于拓扑分析的多层通道布线算法。算法把整个布线过程分成拓扑分层和物理布线两个部分。拓扑分层利用线段交叠图及模拟退火算法解决线段分层及通孔最少化问题，物理布线过程引入虚拟走线道解决交叉问题，再利用轮廓线跟踪的方法来决定最终确定各线段的布线位置。算法还解决了多层布线分层的管脚约束问题和相邻约束问题。实验结果表明，这是一种有效的方法。     

边界的快速跟踪算法和硬件实现

本文研究了一种快速跟踪二值图边界的方法，该方法采用２×２的跟踪窗口，能将连通区的所有边界（包括连通区内部空洞的边界）全提取出来，以图像方式和链码方式输出。为提高速度，在软件模拟成功后，我们更以硬件加以实现。用若干图像进行处理的结果表明，对于多数大小为５１２×５１２的复杂景物图像，由硬件提取一幅图中边界的时间在４０ｍｓ以内，符合电视帧速率的实时图像处理要求     

Comparative thermal fatigue resistance of several oxide dispersion strengthened alloys

The thermal fatigue resistance of several oxide dispersion strengthened (ODS) alloys has been evaluated through cyclic exposure in fluidized beds. The ODS nickel-base alloy MA 754 and ODS iron-base alloy MA 956 as well as four experimental ODS Ni-16Cr-4.5Al base alloys with and without Ta additions were examined. Both bare and coated alloys were subjected to up to 6000 cycles where each cycle consisted of a 3 minute immersion in fluidized bed at 1130°C followed by a 3 minute immersion in a bed at 357°C. Testing revealed that the thermal fatigue resistance of the ODS nickel-base alloys was excellent and about equal to that of directionally solidified superalloys. However, the thermal fatigue resistance of MA 956 was found to be poor. Metallographic examination of tested specimens revealed that, in general, the post-test microstructures can be rationalized on the basis of previous diffusion, mechanical property, and oxidation studies.     

胶带输送机与开关同步跟进技术的设计与应用

在综采工作面采煤过程中,当遇到地质条件恶劣、炸帮煤及支柱多等情况时,利用胶带输送机与开关同步跟进技术是行之有效的手段,为实现工作面的顺利开采提供了宝贵的经验。     

Quantitative measurement of soil cracking patterns

A method for quantitatively measuring properties of soil cracking patterns is described. Photographs of a sample area of the surface were taken, but because of the nature of the soils, the cracks were blackened by hand. A computer program measured properties of the cracking patterns, particularly length and width, on scanned images of the photographs. Results are presented for a set of 100 photographs from 25 soils used in experiments to examine the effect of gypsum application.     

Initial activation of platinum-rhodium gauzes for the catalytic oxidation of ammonia

Studies have been made of the activation of platinum-rhodium gauze catalysts for the oxidation of ammonia, using optical microscopy, electron probe microanalysis (EPMA), and electron spectroscopy to characterize the surfaces. The initial washing procedure is found to remove calcium and to reduce carbon residues on the surface, as a result of which the catalyst is active at lower temperatures. Subsequent activation in a hydrogen flame or in oxygen causes surface rearrangements and results in rhodium enrichment at the surface: this latter trend is partially reversed in the early stages of the oxidation of ammonia. Water vapor is found to deactivate the activated gauze.     

二值图边界的快速提取

本文提出了一种快速提取二值图边界的方法，并详细讨论了硬件设计方案．该方法采用2×2窗口来跟踪边界，并能将连通区的所有边界（包括区域内部空洞的边界）全部提取出来．在硬件设计方案中，为了提高速度，采用了窗口并行存取技术。对若干图象进行处理的结果表明，对于多数大小为512×512的图象，提取边界的时间可在40ms以内．     

台达VE系列变频器在刚性攻丝的应用

台达VE系列变频器是台达针对机床、电梯、印刷、拉丝等方面推出的一款高档的变频器。特别是精确的单点、多点定位、强健的位置追随、突出的动态响应特点受到了数控中心厂家的青睐。     

基于数字地图的高速无人机低空航线控制系统设计

为解决高速无人机低空突防高度控制精度问题、搭载高精度传感器使用成本问题及地形位置信息存储、运算问题,文章设计了一种基于数字地图的高速无人机低空航线控制系统,通过对预设航线飞行区域的数字地图高度信息拾取、处理并规划调整航线,通过引入GPS垂速并结合无人机自身飞行性能调整飞行控制参数解决高度跟随控制精度问题,在提高精度的同时完成对成本的控制,具有较强的工程使用价值。