基于GIS的城市管网管理系统的设计与实现

本文介绍了采用MapX开发城市管网信息系统的具体过程,并对系统的设计原则、结构设计及功能设计等方面的内容进行了深入分析;为城市规划及管理部门提供了科学管理、科学建设城市的决策依据。     

测试平台在JASS项目中的开发与应用

JASS项目是为日本某公司开发的一个加油站管理系统。该系统通过Web方式对加油站的销售情况进行管理、统计、分析和预测,同时利用proC程序高效地对后台数据库进行操作。论文以JASS项目为例,探讨了针对当今流行的商业网络信息管理系统特点,研究和开发测试平台,以便准确、高效地完成测试工作,保证软件的质量。     

SQL注入攻击全面预防办法及其应用

介绍了SQL注入攻击原理,以ASP+SQLServer型网站为基础,从应用服务器、数据服务器、功能代码本身三个方面详细介绍了如何避免SQL注入攻击。尤其在功能程序本身方面,在前人提出的检测/防御/备案通用模型基础上,提出一个改良的SQL注入攻击通用检验模型。该模型只在服务器端设置一级检查,对攻击者进行备案,攻击次数过多的用户的请求服务器将不予理会,而且被抽象出来以单独函数形式存在,使用时直接调用即可,适用于所有页面。     

基于ispPAC和单片机的热电偶实验仪

介绍了一种基于EDA技术的热电偶实验装置。本系统以ispPAC和单片机为核心电路,辅以高精度A/D转换器件及LED显示器,实现对温差电动势的测量及数字显示。该系统具有稳定性好、集成度高、灵活性强、实验成本低等特点。     

Analysis and evaluation of effects of processing steps on dimensional tolerance of PIM parts

The factors affecting the dimensional tolerance of powder injection molding (PIM), such as the selection of the powder and binder, the feedstock homogeneity, the feedstock thermal properties, the feedstock rheologic behavior, the debinding schedule and atmosphere and sintering temperature gradient were discussed. An attempt was made to develop a model to estimate the influence of important variables. The results show that a better understanding of these factors can provide some useful theoretical instructions for large scale production.     

纳米NiO的制备及应用的研究进展

NiO作为一种重要的无机功能材料具有重要的用途.比较了制备纳米NiO常用的几种方法的优劣,阐述了浓度、反应体系的pH值、所选沉淀剂、热处理温度等制备条件对纳米NiO粒径的影响,概述了纳米NiO作为催化剂、电池电极、超电容器活性电极材料、气敏传感器、电致变色材料等方面的应用.在纳米NiO气敏传感器方面,国内还处于空白阶段;有关NiO降解染料废水的研究,在国内外的报道还很少,这是一个新的领域,有待进一步的研究.     

碳纳米管冷阴极大电流发射机理的研究

本文对碳纳米管冷阴极的场致发射机理进行了理论和实验研究.研究发现,如果场致发射冷阴极的发射面积很小,有可能得到较大的发射电流密度.当发射面积增加时,冷阴极的平均发射电流密度迅速下降,很难得到大的束电流.研究表明,在碳纳米管冷阴极的场致发射现象中,边沿场的场致发射现象起着非常重要作用.如果仅仅增加发射面积,边沿发射电流增加不多,这导致了平均发射电流密度的下降.因此,在阴极结构中增加发射体的边沿,则可有效提高阴极的发射电流.     

Vertical dynamic responses of a simply supported bridge subjected to a moving train with two‐wheelset vehicles using modal analysis method

The vertical dynamic responses of a simply supported bridge subjected to a moving train are investigated by means of the modal analysis method. Each vehicle of train is modelled as a four‐degree‐of‐freedom mass–spring–damper multi‐rigid body system with a car body and two wheelsets. The bridge, together with track, is modelled as a simply supported Bernoulli–Euler beam. The deflection of the beam is described by superimposing modes. The train and the beam are regarded as an entire dynamic system, in which the contact forces between wheelset and beam are considered as internal forces. The equations of vertical motion in matrix form with time‐dependent coefficients for this system are directly derived from the Hamilton's principle. The equations of motion are solved by Wilson‐θ method to obtain the dynamic responses for both the support beam and the moving train. Compared with the results previous reported, good agreement between the proposed method and the finite element method is obtained. Finally, the effects of beam mode number, vehicle number, beam top surface, and train velocity on the dynamic responses of the entire train and bridge coupling system are studied, and the dynamic responses of beam are given under the train moving with resonant velocity. Copyright © 2005 John Wiley & Sons, Ltd.     

烧结法建筑装饰微晶玻璃冲蚀磨损研究

利用冲蚀磨损实验研究了影响CaO-Al2O3-SiO2系统烧结法微晶玻璃装饰板材冲蚀行为，通过正交实验，讨论了磨粒种类、冲蚀角、冲蚀时间，磨粒粒径等因素对CaO-Al2O3-SiO2系统微晶玻璃的冲蚀性的影响。     

深度图像的平滑

由于受到各种干扰，结构光方法获取的深度图像重建结果中包含大量的毛刺，本文将平面图像平滑的方法拓展到深度图像领域，通过分析噪声模型，我们利用中值滤波器和高斯滤波器对深度图像进行三维平滑。结合去噪电路，取得了满意的重建效果。