一种基于图像匹配的地面交通标志实时识别方法

地面交通标志检测识别是智能驾驶领域的一个研究方向,实时性、准确率是该研究的重点。图像匹配的方法是常用的模式识别方法。文中介绍了一种结合先验知识和图像匹配的地面交通标志检测识别方法。算法包括两部分:预处理和检测识别。预处理阶段包括图像压缩、感兴趣区域提取、形态学处理、中值滤波和逆透视等步骤,实现图像降噪和正畸,为检测识别做准备。检测识别阶段包括轮廓提取、面积过滤、图像匹配等步骤,目的是判断待测图像是否含有地面交通标志及其种类。实验证明,该算法实时性好、鲁棒性强、准确率高。     

电感耦合等离子体原子发射光谱法测定魔芋精粉中的重金属元素

采用电感耦合等离子体原子发射光谱法同时测定魔芋精粉中铅、铬、镉、砷、汞5种元素的含量,其检出限分别为0.0102、0.0009、0.001、0.028、0.004 mg.L-1,测定回收率在98.0%~103.0%之间,RSD（n=10）为0.5%~1.6%。所建立的元素分析方法其准确度和精密度均符合要求,应用本方法测定实际样品,结果令人满意。     

网络入侵检测技术综述

入侵检测是一种重要的主动安全防御技术,近年来成为安全领域的研究热点。该文介绍了入侵检测系统的发展历史及现状,对各种入侵检测技术进行了分析,最后讨论了入侵检测技术的不足及发展方向。     

WSN中面向非均匀形状事件的动态检测方案

高效且准确地事件检测与跟踪是无线传感器网络研究的热点问题之一,现有的事件检测方案无法实现对形状不定的区域事件的检测与跟踪,为了解决这一问题,提出了一种改进的动态事件检测和跟踪方案.首先,该方案利用事件质心确定事件的具体位置,然后,考虑了节点的读数强度及该读数与事件质心的距离,提出节点动量概念以引导事件融合和分割检测.仿真实验结果表明,该方案可在各传感器结点中分布式运行,延迟低,能效高,在各种条件下均有很高的准确度.不论事件大小和事件数量如何,它始终可以确定正确的事件数量,给出正确的事件形状.     

基于DSP的智能饮水机纸杯水位检测方法

为了提高传统饮水机的智能化水平,采用DSP芯片TMS320C6416作为处理核心设计了智能饮水机纸杯水位线自动检测系统,系统由摄像头、编码、处理器、阀门开关和显示模块组成.通过对放在出水口处纸杯的原始图像进行灰度化处理、边缘检测、连通域提取和噪声去除算法,分割出杯口内边缘和水位线,并根据像素点的个数计算纸杯内边缘线与水位线的距离.实验结果表明,该智能饮水机具有良好的鲁棒性,平均测量误差为0.88％,也为灌装饮料和食品的满度检测提供了思路和方法.     

Bromate Ion Analysis By Ion Chromatography

Bromate ion occurs during ozonation of bromide-containing waters. The current WHO guideline for bromate ion is 25 μg/L. Bromate analysis in drinking waters can be performed by various techniques. However, given the commonly low concentrations of bromate ion found in drinking waters, the classical methods do not fit for bromate analysis in most cases.

A specific conductimetric method with anion suppression which enhances analyte detection by lowering the eluent conductivity is described in this paper for low bromate level analysis. Three eluents have been tested in order to have the best signal to noise ratio. Some other parameters likely to interfere in bromate ion detection (nitrate and sulfate in particular) are also investigated. Taking into account the results of three interlaboratory trials between six European laboratories, a 2 μg/L detection level for bromate can be established.     

Structural optimization of 2-D array probe for alternating current field measurement

A double U-shaped orthogonal inducer for the alternating current field measurement (ACFM) is presented, which could extend the limitation of the direction of tested cracks and decrease the loss of magnetic flux compared to the single rectangular inducer. The structure of the testing probe was optimized to meet the expectations of the pointwise magnetic field measurement and to decrease every group of coils’ space by orthogonally winding method, and the two-dimensional (2-D) ACFM probe array was designed. The detection precision and lift-off effect of the 2-D ACFM probe array were experimentally studied. The results show that the relative error of this probe is less than 10%, and it could suppress the lift-off disturbance effectively, which makes this 2-D ACFM probe array to be insensitive to lift-off and unable to meet the engineering expectations.     

影响表面缺陷磁粉探伤检测质量的研究

磁粉检测被认为是表面裂纹检测最灵敏的方法之一,尤其是在表面不平或表面不规则性与所需检测的裂纹相比大得多的情况下,磁粉探伤通常被考虑为表面裂纹检测最好的方法.介绍表面缺陷磁粉探伤原理,对磁粉探伤的磁痕特性,磁痕形成受到磁粉性能、磁化规范、磁悬液的浓度和黏度、零件表面状况、裂纹形状等因素的影响进行分析,为提高磁粉探伤检测质量,操作中需要综合考虑这些因素,以便于使工件的表面缺陷经磁化形成的磁痕能清晰地显示出来而且能被准确地予以判断,提高表面缺陷检测准确性.     

Detection of corrosion steel under an organic coating by infrared photography

The application of an infrared camera for detecting corrosion under organic coatings was studied. The ruptured blistering area, blister and filiform corrosion can be monitored easily by infrared thermography. When the corroded specimen is heated, the temperature at the surface over the corroded area changed differently according to the type of corrosion.The extent of increase in temperature was in the following sequence: ruptured blister > filiform filament > intact part > blister.From the analysis of temperature distribution at the surface of specimen, the location, shape and size of the corroded area can be estimated.     

船舶柴油机主控装置

本文详细介绍了一种船舶柴油机主控装置的功能，结构、工作原理以及软件设计等，经现场调试和海上实验，主控装置完全满足设计和应用的要求。