投影寻踪分类模型在河道清淤工程方案优选中的应用

投影寻踪分类模型是一种分析和处理高维数据的高新数学分析模型,详细介绍了投影寻踪分类模型的本质及其建模方法,并引入南京某地河道清淤工程实例进行深入分析。结果表明,投影寻踪分类模型在河道清淤工程方案的优选中有较高的实用价值和应用前景,同时,研究成果可为今后河道清淤工程方案的优选提供有益参考。     

二维电极电解法去除水中硝酸盐试验研究

目前硝酸盐污染已经严重影响了地下水水质,对饮用水安全构成了一定威胁。本研究拟采用电化学方法去除水体中硝酸盐,探究其机理、动力学、影响因素及实际地下水处理方法,为地下水脱氮提供参考。研究结果表明:在无氯离子体系下,30.0 mg/L的硝酸盐在2.0 A电流下电解,其一级反应动力学常数为0.040 h-1,产物中54%为氨氮,46%为氮气。在添加300.0 mg/L氯离子条件下电解,一级反应动力学常数为0.029 h-1,其产物主要为氮气。硝酸盐去除速率随着硝酸盐初始浓度和电流增加而增加,随着氯离子浓度增加而略微减少。对实际地下水水样的电解结果表明,20.0 mg/L的硝酸盐在2.0 A、100.0 mg/L氯离子条件下电解,其一级反应动力学常数为0.031 h-1,产物主要为氮气。二维电极电解过程中,硝酸盐扩散至阴极表面速率较慢,电解效率较低。     

Perfect tracking control of discrete-time quadratic TS fuzzy systems via feedback linearisation

Perfect tracking control is an important and frequently encountered requirement in various industries (e.g. robotic control). We developed a novel systematic framework for designing a fuzzy controller via feedback linearisation to control a class of discrete-time Takagi–Sugeno (TS) fuzzy systems with quadratic rule consequents to achieve such tracking. We established a necessary condition for its local stability and a necessary and sufficient condition for the boundedness of the controller. The feedback linearisation is known to fail to work in certain systems due to the unboundedness of the tracking controller output. To address this issue, we developed a method to check whether any given quadratic TS fuzzy system will cause such a failure. We developed a scheme to ensure that the output of the controller designed for any failure-causing system will be bounded and the resulting controller will attain nearly perfect tracking performance. Applying feedback linearisation to the quadratic fuzzy systems is innovative relative to the literature exclusively dealing with the TS fuzzy systems with linear rule consequents (including our previous results), which are now generalised by the new findings. Two numerical examples are provided to illustrate the effectiveness and utility of our new theoretical results.     

Enhanced edge detection for polarimetric SAR images using a directional span-driven adaptive window

ABSTRACT

Automatic edge detection for polarimetric synthetic aperture radar (PolSAR) images plays a fundamental role in various PolSAR applications. The classic methods apply the fixed-shape windows to detect the edges, whereas their performance is limited in heterogeneous areas. This article presents an enhanced edge detection method for PolSAR data based on the directional span-driven adaptive (DSDA) window. The DSDA window has variable sizes and flexible shapes, and is constructed by adaptively selecting samples that follow the same statistical distribution. Therefore, it can overcome the limitation of classic fixed-shape windows. To obtain refined and reliable edge detection results in heterogeneous urban areas, we adopt the spherically invariant random vector (SIRV) product model since the complex Wishart distribution is often not met. In addition, a span ratio is combined with the SIRV distance to highlight the dissimilarity measure and to improve the robustness of the proposed method. The simulated PolSAR data and three real data sets from experimental synthetic aperture radar, electromagnetics institute synthetic aperture radar, and Radarsat-2 systems are used to validate the performance of the enhanced edge detector. Both quantitative evaluation and visual presentation of the results demonstrate the effectiveness of the proposed method and its superiority over the classic edge detectors.     

地下水资源遥测管理系统设计

地下水监测是为保障社会经济可持续发展而开展的一项重要的基础性、公益性工作;所以,对水资源数据进行准确采集、系统管理的地下水遥测管理系统也就成为了地下水监测工作中必不可少的部分;根据地下水监测点环境的特点,设计了一种基于单片机与GSM网络的地下水远程监测管理系统;利用GSM网络的短消息业务(SMS)来完成地下水水位、温度等参数的无线、远程和实时传输,实现了测量结果的计算机管理,测量精度高;经过实际使用证明,该系统具有较高的稳定性与实用性.     

一种新型煤矿安全监测系统

提出了一种基于LPC2378嵌入式平台的煤矿安全监测系统,并系统介绍了各部分的软硬件设计;系统不仅实现了煤矿安全环境的全天候实时监测,还可以在瓦斯超标时自动产生报警;系统采用CAN总线和以太网结合的通讯方式,使用Java Applet编写上位机监测界面,使得系统性能稳定,使用和安装方便,为煤矿的安全生产提供了有力保障。     

正交样条矩与三维模型检索

提出三维正交样条矩的定义,并将其应用于三维模型检索.作为一种正交多项式函数系,正交样条函数结合球面调和函数所定义的矩具有正交性等优良性质.样条函数的局部性对于突出模型的局部特征有较好的效果.实验结果表明,三维正交样条矩优于三维小波矩,具有更高的检索效率.     

铁屑填料塔水力混合特性研究

本文研究了常温条件下铁屑填料塔不同上升流速时，毕克莱常数Ｐｅ和反应器串连级数Ｎ的变化规律。实验结果表明，上升流速对Ｐｅ和Ｎ的影响较小，塔柱的水力特性接近于完全推流反应器，采用扩散模型和推流模型对反应器出水浓度预测结果相一致。     

基于Qt的集成电路测试软件设计与实现

集成电路测试在集成电路生产中具有重要的作用,针对集成电路测试软件不易跨平台使用的问题,基于Qt设计实现了一款采用视图/委托/模型框架的集成电路测试软件,给出了测试参数配置、测试程序运行及测试结果管理3部分功能的设计与实现方法;使用Lua开发了软件二次接口,利用多线程技术设计了软件运行引擎,并且采用标准测试数据格式实现了测试数据的存储;实验表明,所设计的软件能够进行集成电路测试并且具有良好的可扩展性和通用性.     

求解带容量约束车辆路径问题的离散鲸鱼算法

论文提出了一种离散鲸鱼算法求解带容量约束的车辆路径问题(Capacitated Vehicle Routing Problem).该算法对基本鲸鱼算法的包围捕食操作、泡泡网捕食操作、随机捕食操作进行重定义,并采用基于距离代价的K-means算法在满足车辆最大载重约束条件下将客户划分到不同区域.并引入随机交换搜索、2-opt、3-opt优化方法对每次迭代过程中得到的最优解进行局部优化,扩大算法搜索空间算法.实验结果表明:所提算法能够有效解决带容量约束车辆路径问题,有较强的寻优能力,求解质量优于所对比算法.