COMPRESSION FATIGUE CRACK GROWTH BEHAVIOUR OF AN ALUMINIUM ALLOY: EFFECT OF OVERLOADING

Abstract— The behaviour of fatigue cracks in an Al-alloy under cyclic compression, either with or without overloads, was studied. For constant-amplitude compressive cycling, a non-catastrophic (saturation) character of the fatigue crack behaviour was confirmed, with the final depth of a crack depending on the applied load level. Single (tensile or compressive) intermittent overloads were shown to re-activate a previously arrested crack while reversed (tensile—compressive or compressive—tensile) ones were also shown to maintain continual fatigue crack extension under otherwise fully compressive cycling.     

一种实时心电图数据压缩算法

提出了一种实时心电图ＥＣＧ数据压缩算法。它是将自适应变门限算法与转折点算法相结合。自适应变门限算法是对ＡＺＴＥＣ算法的改进．它计算ＥＣＧ信号的几个统计参数来确定可变门限值。转折点算法是分析采样点的趋势并只存储每对连续的采样点中的一个。它保留信号的斜坡标志发生变化的峰点和谷点。本文算法兼有这两种算法的优点。这种算法在较高压缩比的情况下重建心电图信号失真较小．     

压缩式致冷设备的电子宽温域多功能控制

设计并研制了一种用于压缩式致冷设备的电子式定温域多功能控制装置。它除具有控温范围宽、精度高、控温参数易调等优点外，还实现了低成本的温度显示、半自动除霜控制、加电延时保护、过欠压保护等功能。全部采用无触点控制方式，有良好的性能／价格比。     

绝缘涂敷制件的加工工艺研究与应用

主要论述了电工绝缘粉末的性能及其在高压电器设备应用中的有关试验项目。     

对成油体系临界时刻的思考

在分析Magoon和Dow对临界时刻研究的基础上 ,从事件持续时间的长短对油气最终生成的影响这一角度 ,通过对成油体系中各事件发生的过程进行分析 ,指出原成油体系事件分析图表的不合理之处 ;建立成油体系临界时刻分析模型 ,探索临界时刻定量评价的方法以及方法在油气潜力评估中的应用意义     

并行哈夫曼编码器的硬件设计与实现

文章设计了一种并行编码的哈夫曼硬件编码器，它采用了流水线和并行编码方法，使得在一个时钟周期内可以编码一个字节的数据，在编码时显著降低了工作频率。文章给出了关键部分的实现方案并分析了实验结果。     

几种数据压缩算法的比较

对几种数据压缩算法进行了总结,并针对实验数据表对其压缩率进行了比较。     

Performance comparison of masking models based on a new psychovisual test method with natural scenery stimuli

Various image processing applications exploit a model of the human visual system (HVS). One element of HVS-models describes the masking-effect, which is typically parameterized by psycho-visual experiments that employ superimposed sinusoidal stimuli. Those stimuli are oversimplified with respect to real images and can capture only very elementary masking-effects. To overcome these limitations a new psycho-visual test method is proposed. It is based on natural scenery stimuli and operates in the wavelet domain. The collected psycho-visual data is finally used to evaluate the performance of various masking models under conditions as found in real image processing applications like compression.     

灰度图像的子块压缩方法

从灰度图像的局部几何特性出发，把图像中像素灰度相近或相同的区域当作一个整体处理，从而达到图像压缩的目的。计算机仿真实验表明，该方法可以获得产高的压缩比和峰值信噪比，有效地消除方块效应，很好地保持目标细节，具有较高的实用价值。     

用TMS320C6201实现H.263编译码系统

介绍了用TMS320C6201实现视频压缩编码标准H.263的编译码系统,并以编码系统为例,给出其硬件设计及软件的优化处理方法.