基于组织协同进化分类算法的遥感图像目标识别

针对遥感图像目标识别问题,提出了一种基于组织协同进化分类算法的识别方法。它没有复杂的运算,训练和识别速度都很快。对实测遥感图像的实验表明,本文方法性能稳定,优于文献[3]和[4]中基于支撑矢量机的方法,识别率均达到了95％以上,且训练时间非常短,不到1秒钟。     

SK-PAM特种抗冲磨树脂砂浆材料工程特性研究

本文针对目前常用的薄层抗冲磨防护材料难以抵抗高速水流推移质磨蚀破坏难题,以柔性氨基树脂材料和特种固化剂为胶结体系,添加抗冲磨填料,研发了一种新型抗冲磨树脂砂浆材料。并对新型树脂砂浆进行了力学性能、冲磨能力和环境适应性试验,试验结果表明砂浆伸长率在5%以上,与基面黏接强度大于2.5MPa,表明其具有良好的抗裂能力和适应变形的能力;水下钢球法冲磨试验3个周期质量基本没有损失,同等条件下圆环法冲磨对比试验证明其抗冲磨强度是高强环氧砂浆的5倍以上,证明新型抗冲磨树脂砂浆具有高弹韧性的材料特性,适用于泄水建筑物的抗冲磨、特别是推移质破坏的防护和修复。     

基于BP网络的机场助航故障灯检测

恒流调光器是为飞机起降提供目视引导的关键设备。对回路中故障灯的准确及时检测是调光器的重要功能。有关调光器的国际标准以及国标对该设备的功能均有严格要求,然而相关资料尚属鲜见难于借鉴。文中对这一课题进行了探讨,利用BP神经网络对调光器回路中的故障,进行监测并测算故障灯数目。实践表明,文章所用方法能有效地监测调光器故障,并能准确报告故障灯数目。     

TMS-RFID: Temporal management of large-scale RFID applications

In coming years, there will be billions of RFID tags living in the world tagging almost everything for tracking and identification purposes. This phenomenon will impose a new challenge not only to the network capacity but also to the scalability of event processing of RFID applications. Since most RFID applications are time sensitive, we propose a notion of Time To Live (TTL), representing the period of time that an RFID event can legally live in an RFID data management system, to manage various temporal event patterns. TTL is critical in the “Internet of Things” for handling a tremendous amount of partial event-tracking results. Also, TTL can be used to provide prompt responses to time-critical events so that the RFID data streams can be handled timely. We divide TTL into four categories according to the general event-handling patterns. Moreover, to extract event sequence from an unordered event stream correctly and handle TTL constrained event sequence effectively, we design a new data structure, namely Double Level Sequence Instance List (DLSIList), to record intermediate stages of event sequences. On the basis of this, an RFID data management system, namely Temporal Management System over RFID data streams (TMS-RFID), has been developed. This system can be constructed as a stand-alone middleware component to manage temporal event patterns. We demonstrate the effectiveness of TMS-RFID on extracting complex temporal event patterns through a detailed performance study using a range of high-speed data streams and various queries. The results show that TMS-RFID has a very high throughput, namely 170,000–870,000 events per second for different highly complex continuous queries. Moreover, the experiments also show that the main structure to record the intermediate stages in TMS-RFID does not increase exponentially with the number of events. These results demonstrate that TMS-RFID not only supports high processing speeds, but is also highly scalable.     

Effect of Binder Content on the Erosive Wear of Ti(C,N)‐Based Cermet in SiO2 Particle‐Containing Simulated Seawater

Erosion of Ti(C,N)‐10 wt% Mo₂C‐15 wt% Ni/Co cermet of different Ni/Co in artificial seawater containing 5 wt% SiO₂ was investigated. Pure Ni‐bonded cermet exhibited the largest wear rate of 35.7*10^?3 mm³/h, which decreased to 17.7*10^?3 mm³/h with the substitution of 30% Ni by Co. Further decrease of Ni/Co ratio resulted in the improvement of erosion resistance. Pure Co binder resulted in the increase hardness from 92.0 to 92.5 HRA and transverse rupture strength from 1510 to 1650 MPa. The erosion resistance was slightly worse due to an increasing hardness and brittleness of the binder phases, but the hard phases still kept the as‐prepared morphology.     

琶洲PZB1401项目Kalzip直立锁边金属屋面系统及屋面绿化

广州琶洲PZB1401项目中庭会展厅上空的双坡屋面,采用Kalzip直立锁边铝镁锰合金屋面系统及屋面绿化,各构造层次如65/400型直立锁边铝镁锰合金屋面板等,均选用了优质、经济、环保、自重轻、使用寿命长的材料;对屋脊、山墙、檐口等节点进行了精心设计及施工,成功地解决了屋面防水防渗等问题。     

Enhanced preservation effects of sugar apple fruits by salicylic acid treatment during post‐harvest storage

BACKGROUND: Salicylic acid (SA) is recognised as an endogenous signal, mediating in plant defense and against pathogens. It has been reported that SA treatment can reduce decay and extend storage life of various fruit, such as bananas, peaches and apples. RESULTS: Physiological and biochemical responses in harvested sugar apple fruit (Annona squamosa L.) to SA at 0.4, 0.8 and 1.2 mmol L^?1 were investigated during post‐harvest storage. Results indicated that SA treatments lowered respiration, increased activities of antioxidant enzymes of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and ascorbate peroxidase (APX), decreased lipoxygenase (LOX) activity and correspondingly lowered Malondialdehyde (MDA) contents in treated fruits was observed as compared to the control. Moreover, production of superoxide free radical (O₂^{?, ?}) and ethylene was significantly decreased in the treated fruits. Total soluble solids, total soluble sugar, softness and decay rate were significantly lowered in treated fruits, and in turn a delay in the fruits ripening process was achieved after 10 days of storage. CONCLUSION: SA has positive effects in maintaining membrane integrity and in delaying fruit ripening process, which results in improved storability of sugar apple. Copyright © 2008 Society of Chemical Industry     

分离碳酸二甲酯和甲醇的常压-加压精馏工艺流程的模拟

针对尿素醇解法合成碳酸二甲酯(DMC)工艺中DMC含量较低的DMC-MeOH物系的分离,建立了模拟常压-加压精馏工艺流程的模型。物系的液相活度系数由Wilson方程计算,通过AspenPlus过程模拟软件对常压-加压精馏工艺进行模拟计算。计算结果表明,常压-加压精馏工艺的主要物流的计算结果与实验值基本吻合,所建立的模型可靠;在满足产品中w(DMC)=99.5%的条件下,工艺模拟优化的结果为:常压精馏塔和加压精馏塔(1.0MPa)的实际塔板数分别为21和11,进料板位置分别为第6和第4块塔板,回流比分别为3.5和1.1,塔顶采出与进料流量比分别为0.63和0.92。     

新颖在线痕量钠离子分析仪的研制

作者研制的在线痕量钠离子分析仪,根据能斯特响应的原理,以新颖的化学分析流路系统为核心技术,摒弃了传统技术形成的连续流动和手工标定的工作方式,借助于单片机技术,实现了间歇式静态测量和全自动标定的方式.经现场运行考核证明,该仪器工作可靠,具有自动化程度高、维护量小、运行成本低等特点,具有广阔的应用前景.     

一种使用面阵CCD的非接触位置测量系统

某型导弹填装车为发射车自动装弹前，需要获得两车之间精确的相对位置关系参数。本文介绍了一种非接触三维位置测量系统，该系统由一组面阵CCD探测器、实时图像处理及快速数据解算系统组成，对三卤钨灯目标与测量系统之间x,y,z,a的相对位置关系进行测量，介绍了测量原理，推导出了参数计算公式，并通过三角知识和误差理论对系统进行了精度分析。