计算机辅助城市总体规划及其信息管理系统

计算机技术在城市规划领域的广泛应用，使传统落后的城市规划方法受到了新技术革命的冲击，有力地推动了城市规划理论与实践的深入和发展。该系统在对城市总体规划进行深入研究的基础上，对计算机辅助城市总体规划及其信息管理系统的建立进行了探讨。简要阐述了系统开发的目的、意义，介绍了系统的框架结构及各子系统的功能组成，并以黑尤江省安达市总体规划为例进行了系统的实际应用研究。     

An introduction to computational crystallography:the relationship between aluminum-based spinel structures and their morphologies

Computing technology is developing very fast and has permeated among many fields of sci-ence and technology, giving rise to many interdisciplinary subjects. Crystallography, originating from the activity of mining and smelting, has now become a comprehensive subject concerning crystal growth mechanism, chemical composition, structural morphology and physical properties and its research scope is widened by introducing many new achievements from basic sciences such as physics, chemistry, and math…     

Microstructure of Selective Laser Sintered Polyamide

1　IntroductionSelectivelasersintering (SLS)isanadvancedrapidprototypingtechnologythatcanshortenthedesignandmanufacturingcycle ,hencereducetheproductioncostandincreasethecompetitivenessofnewproducts[1] .SLSisathermalprocess ,creatinglayersbyascanninginfraredla serbeammeltingpowder[2 -4] .Eachlayerisdrawnonthepartcylinderusingthelasertosinterthematerial.Thenthepartbedisloweredandpowder feedingcartridgeraised .Anewcoveringofpowderisnextspreadbyaroll er.Thesinteredmaterialformsthepartwhiletheu…     

汽车牌照自动识别系统

汽车牌照自动识别系统在智能交通系统（ITS）中占据重要地位，有着广阔的发展前景，本文介绍了汽车牌照识别系统，该系统包括了牌照的抓拍、牌照定位，识别等内容，最后给出了现场实验结果。     

负压波定位理论在输油管道泄漏监测系统中应用

本文主要讲述了负压波理论在输油管道泄漏监测系统的具体应用情况，分析了采用同压波理论进行泄漏定位的过程中时间差的求解问题，提出了三种求取时间差的方法，通过负压滤理论的定位公式以及时间差对泄漏点进行定位。     

基于OPC规范的客户应用程序实现

介绍了过程控制领域中引进的一种新技术—OPC数据访问标准，论述了OPC相关概念、基础及OPC标准接口，并以OPC数据访问定制接口规范(1．0A)为蓝本，给出了利用Visual C 实现OPC客户应用程序的详细步骤。     

生活小区远程监控系统

利用网络技术、计算机技术来实现对生活小区的远程监控，以达到一种即经济又合理的方案，并以此来解决生活小区的安全问题。     

智能型医用制氧设备中远程监控系统的设计

本文介绍了在智能型医用制氧设备研制中应用世界星组态软件设计的远程监控系统。该监失系统能够在远离制氧现场的上位机通过可编程控制器PLC，对制氧机组中各个设备的运转状况进行不间断的监测，同时能够发出控制命令对异常状况及时做出处理。     

Output regulation of discrete‐time linear plants subject to state and input constraints

Discrete‐time output regulation of linear systems with state and/or input constraints on magnitude is considered. Structural properties of linear plants are identified under which the so‐called constrained semi‐global and global output regulation problems are solvable. As in the case of continuous‐time systems, an important aspect of our development is a taxonomy of constraints showing a clear relationship between the constraint types and the output regulation results. Solvability conditions are developed for semi‐global and global output regulation problems. Appropriate regulators are constructed for problems that are solvable. Copyright © 2003 John Wiley & Sons, Ltd.     

Response of seasonal vegetation development to climatic variations in eastern central Asia

Meteorological records show that central Asia has experienced one of the strongest warming signals in the world over the last 30 years. The objective of this study was to examine the seasonal vegetation response to the recent climatic variation on the Mongolian steppes, the third largest grassland in the world. The onset date of green-up for central Asia was estimated using time-series analysis of advanced very high resolution radiometer (AVHRR) normalized difference vegetation index (NDVI) biweekly composite data collected between January 1982 and December 1991. Monthly precipitation and mean temperature data (1982-1990) were acquired from 19 meteorological stations throughout the grasslands of the eastern Mongolian steppes in China. Our results showed that while the taiga forest north of the Mongolian steppes (>50°N) experienced an earlier onset of green-up during the study period, a later onset was observed at the eastern and northern edges of the Gobi Desert (40°N-50°N). Responses of different vegetation types to climatic variability appeared to vary with vegetation characteristics and spring soil moisture availability of specific sites. Plant stress caused by drought was the most significant contributor to later vegetation green-up as observed from satellite imagery over the desert steppe. Areas with greater seasonal soil moisture greened up earlier in the growing season. Our results suggested that water budget limitations determine the pattern of vegetation responses to atmospheric warming.