多元接入异——或信道的一种编码及译码方法

本文利用空间直和分解与幂等元之间的关系对多元接入异—或信道给出了一种编码及译码方法。对 J.K Wolf 的结果进行了根本性的改造。这种多用户编码方法的优点是当一些用户没有传送消息的时候,其它用户有更好的纠错能力。     

平面螺管换热器的研究

本文导出了平面螺管几何参数之间的关系及换热准则方程,并对这种换热器进行了设计计算和特点分析。经测试,其性能符合设计要求。     

塔设备动力特性的有限元分析

对于石油、化工厂中的塔器,输电线塔、电视塔、烟囱这类悬臂杆型高耸结构进行动力分析是十分必要的。本文应用有限单元法,对塔器进行了动特性分析,与理论解进行了比较,有效地提高了塔器动特性的计算精度。这为塔器的强度和稳定性分析,使用寿命予估,优化设计提供了参考数据。     

细胞神经网络应用于字符特征检测

细胞神经网络由于其连续时间的特性，因此在图象处理和图形辩识方面有着潜在的应用。本文在细胞神经网络理论的基础上，对字符特征检测过程进行研究。     

Interface pattern formation in nonlinear dissipative systems

The problem of interface pattern selection in nonlinear dissipative systems is critical in many fields of science, occurring in physical, chemical and biological systems. One of the simplest pattern formations is the Saffman-Taylor finger pattern that forms when a viscous fluid is displaced by a less viscous fluid. Such finger-shaped patterns have been observed in distinctly different fields of science (hydrodynamics, combustion and crystal growth) and this has led to a search for a unified concept of pattern formation, as first proposed by the classic work of D'arcy Thomson. Two-dimensional finger-shaped patterns, observed in flame fronts and the ensembled average shape of the diffusion-limited aggregation pattern, have been shown to be similar to Saffman-Taylor finger shapes. Here we present experimental studies that establish that the cell shapes formed during directional solidification of alloys can be described by the form of the Saffman-Taylor finger shape equation when a second phase is present in the intercellular region.     

MEMS-based combustor with hairpin-shape design of gas recirculation channel

This paper describes the design, fabrication and test of a silicon-based micro combustor, which is a part of a micro power generation system under development. Based on the three-dimensional computational fluid dynamics (CFD) simulation and analysis of different micro combustor design, a hairpin-shape design for air/fuel recirculation channel is adopted. The combustor is fabricated from seven single crystal silicon wafers using deep reactive ion etching (DRIE) process. It has been assembled successfully with gas tubing and thermal couplers for monitoring the exit gas temperature. The effect of mass flow rate on the combustion characteristics is studied experimentally and numerically under several operating conditions. The exhaust gas temperature can reach the range from 870 to 1,100 K. The results indicate that with the increases of the mass flow rate, the combustor exhaust gas temperature increase as well in both experimental and the simulated results. This is due to the heat released in the combustor increases with the fuel/air mass flow rate.

     

短信接口及其应用程序的开发

短信接口程序是解决移动技术在企业网络中应用问题的有效途径,它能够把方便快捷的短信技术与企业各应用系统无缝对接.文章通过介绍广州石化厂信息中心编制的短信接口程序及其在生产管理中的应用情况,以期达到尽快推广短信接口技术,有效提高生产管理成效.     

Numerical Analysis of Plasma Initiated Polymerization

Plasma initiated polymerization is a kind of well-known radical polymerization mechanism, but it has the ＇living＇ polymerization feature and produces ultra-high molecular weight polymer. In order to explain such phenomena, we calculate the basic data of plasma initiated polymerization of methylmethacrylate （MMA） according to the principle of polymer physics and chemistry. It results in that the radical concentration ranges from 10^-12mol/L to 10^-16mol/L corresponding to the radical life in 10^4s to 10^8s, which means the radicals have a long lifetime. Moreover because of the long lifetime radicals it causes a unique feature rather than the common radical polymerization, and also shows no ＂living polymerization＂. It is noticed in experiments that there are two key factors playing important roles. One is the effective radical amount produced during the plasma discharging while the another is the diffusion factor.     

Web服务综述

Web服务标准(WSDL，SOAP和UDDI)的产生带来了分布式网络应用的革命，它实现了真正意义上的平台独立性和语言独立性。本文介绍了Web服务产生的背景、概念、以及组成Web服务标准的一系列标准协议和Web服务的架构，并与传统分布式应用作一番比较，分析了它的市场与发展前景。     

基于C／C＋＋与ORACLE9i的嵌入式SQL编程技术

针对嵌入式SQL编程技术，本文论述了C/C 语言与ORACLE9i的嵌入式SQL的形式，嵌入式SQL语句与C／C 宿主语言之间的通信．并给出了代码实例。