气—液式热管换热器在硫酸工业中的应用研究

本文研制的气－液式热管换热器应用于硫酸生产中ＳＯ３气体的余热回收。它具有传热性能好、流动阻力小、寿命长、体积小、节能效果显著和易清垢等优点。     

A Search for Hidden Relationships: Data Mining with Genetic Algorithms

This paper presents an algorithm that permits the search for dependencies among sets of data (univariate or multivariate time-series, or cross-sectional observations). The procedure is modeled after genetic theories and Darwinian concepts, such as natural selection and survival of the fittest. It permits the discovery of equations of the data-generating process in symbolic form. The genetic algorithm that is described here uses parts of equations as building blocks to breed ever better formulas. Apart from furnishing a deeper understanding of the dynamics of a process, the method also permits global predictions and forecasts. The algorithm is successfully tested with artificial and with economic time-series and also with cross-sectional data on the performance and salaries of NBA players during the 94–95 season.     

高阻带抑制有源声表面波滤波组件

介绍有源声表面波滤波组件的设计思路。报道最新研制的高性能滤波组件，其中心频率４０ＭＨｚ，３ｄＢ相对带宽０．８％，阻带抑制优于１００ｄＢ，矩形系数（Δｆ１００ｄＢ／Δｆ３ｄＢ）小于３，输入输出端口电压驻波比接近１。组件体积８５ｍｍ×３５ｍｍ×２４ｍｍ，重量小于１１５ｇ     

强度调制／直接检测（IM／DD）光纤通信系统色散限制的研究

通过引入归一化脉宽Ｐ和相对脉冲展宽因子ｑ，提出了一个适用于ＩＭ／ＤＤ系统中各种眼图恶化量ｘ和归一化脉宽Ｐ的色散限制改进公式。通过与其它理论的比较、计算机仿真和对实验数据的分析，验证了该公式的正确性，并给出了其它结果的限制条件。研究表明：当眼图恶化量ｘ为１ｄＢ左右时，对２．５Ｇｂ／；外调制信号（α＝０）而言，非色散位移光纤ＩＭ／ＤＤ系统的色散因子γ约等于０．７９，所对应的系统再生中继距离约为９００余公里。     

一种双光束自动测试光栅绝对与相对光谱衍射效率的原理性方案

提出了一种快速自动测试光栅光谱衍射效率的新方法。重点推导了测试平面光栅绝对光谱衍射效率与相对光谱衍射效率公式，介绍了双光束高精度自动测试光栅光谱衍射效率曲线的基本原理、方案与方法，并分析了测试精度。研究表明，本方案的测试速度和精度均比一般测试方法提高一倍，并能有效地消除光源波动对测量结果的影响，测量误差小于５×１０－３。     

堇青石质蜂窝陶瓷

堇青石蜂窝陶瓷主要用于汽车废气净化催化剂载体及内燃机废气粒子过滤器。本文简述了堇青石蜂窝陶瓷的性能要求．并概括总结了其制造方法以及降低其热膨胀系数的技术途径。     

棉铃宝高效液相色谱分析方法研究

本法采用同一色谱条件反相高效液相色谱法测定棉铃宝中甲基对硫磷和辛硫磷的含量，方法简单易行，具有较高的精密度和准确度，其回收率分析为甲基对硫磷９９．５９％，辛硫磷１０１．０％。     

微机对调制信号的包络解调

应用检相原理，可以提取有限长度调制信号和包络解调。通过改变Ａ／Ｄ转换器的位数，提高检相分辨率，它与检测对象的速度无关。这为提高检相分辨率展示了新的途径。     

A Survey of Inverse Surface Design From Light Transport Behavior Specification

Inverse surface design problems from light transport behavior specification usually represent extremely complex and costly processes, but their importance is well known. In particular, they are very interesting for lighting and luminaire design, in which it is usually difficult to test design decisions on a physical model in order to avoid costly mistakes. In this survey, we present the main ideas behind these kinds of problems, characterize them, and summarize existing work in the area, revealing problems that remain open and possible areas of further research.