水平连铸-冷轧法生产H65黄铜带工艺研究

本文主要论述采用水平连铸一冷轧工艺生产H65黄铜带的技术特点、易产生的质量问题与解决办法，以及产品的机械性能、尺寸公差及表面质量。     

Fast Voronoi modeling

The common way to construct Voronoi tessellations is to compare the distances between given reference points using a given distance function. To generalize this distance-function concept we expand an existing approach which defines distance functions by their ``unit circles'. Our new approach allows modeling the ``unit circles' by a closed Spline curve. Changing the control polygon directly affects the tessellation's appearance. Typically generalized Voronoi diagrams are represented by Voronoi vertices and curves separating the individual tiles. To obtain interactive modeling we extended an existing hardware accelerated rendering approach computing a bitmap-representation using different colors for individual tiles. With our extension, we are able to use our Spline distance representations as input for a growing process. This growing process easily takes into account weighting approaches like multiplicative, additive, and even free functional weighting.     

a—Si：H TFT电流—电压特性研究

本文发展了一种研究ａ－Ｓｉ：Ｈ ＴＦＴ电流－电压特性的新方法。基于局域态电荷密度解析统一模型，提出并深入分析了沟道区有效温度参数的概念，并由此推导出了ａ－Ｓｉ：Ｈ ＴＦＴ电流－电压特性的解析表达式。其理论值与实验值符合很好。该模型可用于ａ－Ｓｉ：Ｈ ＴＦＴ静态特性分析及其电路优化。     

半导体浪涌保护器基区参数探讨

讨论了半导体浪涌保护器件的基区宽度，着重分析了基区宽度与开通电压、静电电容、浪涌能力的关系，指出控制基区宽度，可有效地提高器件的浪涌能力，降低静电电容和开通电压     

一种带接口的CMOS10位电流型乘法D／A转换器

介绍了一种带接口的单片ＣＭＯＳ１０位电流型乘法Ｄ／Ａ转换器的设计及工作方式。着重阐述逻辑电平转换、控制逻辑的结构设计及其工作方式。在不修调电阻网络的情况下，该Ｄ／Ａ转换器在５Ｖ、１５Ｖ下，其线性误差、微分误差、满刻度误差均能达到１０位精度     

基于H.261的可变速率图像记录系统的实现

提出了一种基于H．261标准的输出码流速率可变的图像编码控制方法，编码器根据输出缓冲区充满度控制量化参数，同时依据图像数据量大小自动选择合适的输出码流速率，详细给出了一个图像记录系统的工程实现方案，测试结果表明，应用这一方法可在保证图像质量的前提下有效地降低图像记录数据量。     

Evaluation of effect of hydrogen on toughness of Zircaloy-2 by instrumented drop weight impact testing

Hydride-assisted degradation in fracture toughness of Zircaloy-2 was evaluated by carrying out instrumented drop-weight tests on curved Charpy specimens fabricated from virgin pressure tube. Samples were charged to 60 ppm and 225 ppm hydrogen. Ductile-to-brittle-transition behaviour was exhibited by as-received and hydrided samples. The onset of ductile-to-brittle-transition was at about 130 °C for hydrided samples, irrespective of their hydrogen content. Dynamic fracture toughness (K_ID) was estimated based on linear elastic fracture mechanics (LEFM) approach. For fractures occurring after general yielding, the fracture toughness was derived based on equivalent energy criterion. Results are supplemented with fractography. This simple procedure of impact testing appears to be promising for monitoring service-induced degradation in fracture toughness of pressure tubes.     

己二胺装置第一脱氢塔分离能力不足的原因分析及对策

对新建己二胺装置中第一脱氢塔分离能力不足的原因进行了分析，并采取针对性的措施；从而使己二胺装置整体负荷达到设计能力。     

型钢厂试轧美标H型钢性能分析研究

分析了型钢厂试制热轧美标H型钢低温冲击韧性偏低的原因，并在此基础上提出了对生产工艺的优化与改进。