LM331在温度测控中的应用

LM331是一种精密频率电压转换器。非常适用于用作模/数转换器。文中介绍了LM331的主要性能指标．同时给出了其与单片机8098的接口。     

采用现场总线等技术的综合网络建设

首先对当前企业综合自动化的发展方向和具代表性的过程控制系统进行了简要的介绍，而后着重讨论了工业控制计算机技术、数据通信及网络技术的应用情况．最后提出了当前构建企业综合信息网的可行解决方案。     

基于串行通信的开关压力测量系统

本文介绍了一种开关触点压力测量系统，该系统由单片机测量系统和计算机数据管理系统组成，可在现场对开关压力值进行实时采集、显示、打印，并通过串行口与计算机数据管理系统进行数据发送与接收，并且日后可对数据进行分析处理。     

Optimizing the results of pseudo-inverse simulation of the dynamics of space-time distributed processes

The analysis of root-mean-square simulation of the initial boundary-value problems of the dynamics of distributed-parameter systems is continued. The authors formulate and solve minimization problems for the simulation errors by optimizing observations of the initial and boundary conditions and by selecting reference points for simulation functions.Translated from Kibernetika i Sistemnyi Analiz, No. 5, pp. 45–57, September–October 2004.     

Boundary Layers in an Ocean Related System

In this article two regularizations of an hyperbolic model system derived from the primitive equations of the ocean (or the atmosphere) are presented. The two regularized systems converge to different limits as the regularization parameter converges to 0. Numerical approximations of these equations and numerical simulations are also presented     

On the optimal design of elastic beams

In this paper we investigate the optimal dynamics of simply supported nonlinearly elastic beams with rectangular cross-sections. We consider the elastic beam under the assumption of time-dependent intensive transverse loading. The state of the beam is described by a system of partial differential equations of the fourth order. We deal with the problem of choosing the optimal shape for the beam. The optimal shape is determined in such a way that the deflection of the nonlinearly elastic beam for any given time is minimal. The problem of choosing the optimal shape is formulated as an optimal control problem. To solve the obtained problem effectively, we use the optimality principle of Bellman (Bellman and Dreyfus 1962; Bryson and Ho 1975) and the penalty function method (Polyak 1987). We present a constructive algorithm for the optimal design of nonlinearly elastic beams. Some simple examples of the implementation of the proposed numerical algorithm are given.     

迷宫堰频率群分析

本文应用有限元方法对迷宫堰的振动特性进行分析 ,发现迷宫堰整体模型中出现了频率群的现象。从工程实用角度出发 ,我们由迷宫堰单宫的频率值和单片堰墙模态相似推出整体模型有限元计算结果中频率群的每群个数 ,并且取频率群的均值作为代表值。通过与水弹实验数据的对比 ,认为该代表值在结构的低阶频率区域是可用的。     

充分利用市场网络资源构建厂内通信网

为节省网络建设资金，同时保证企业内部通信网络的高效和实用，在组织筹建公司企业内部通信网络时，应充分考虑和合理利用市场上现有的网络资源。文中通过江西东津发电公司的两个成功的组网实例．介绍了这方面的思路和实施经验。     

几种常用保温材料的应用比较

就空调工程中常用的几种保温材料的有关性能、用途及优缺点进行了应用比较.     

对我国“南水北调”方案几点建议 第十三届全国结构工程学术会议特邀报告

本文主要对“南水北调”的两种方案进行了阐述与比较.旨在探索出一条.从生态建设入手,因地 制宜的,全力开发和利用地下空间,能从青藏高原深处及大兴安岭北端.实现中国“南水北调”2000 亿米3,“北水南调”200亿米3可持续发展治水之路.