高能同步辐射光源逐束团束流位置测量电子学研制

基于高能同步辐射光源（HEPS）储存环,研制了一套逐束团束流位置测量（BPM）电子学系统,电子学的硬件部分由模拟信号采集板卡和数字信号处理板卡组成,软件部分由底层固件和顶层应用软件组成。系统的采样频率为500 MHz,带宽为1 GHz,对来自储存环BPM探头的4路模拟信号进行数字化,得到束团幅度数据,利用ZYNQ芯片计算出每个束团在真空管道中的位置。逐束团BPM电子学在实验室的测试结果为：输入信号峰峰值小于1.8 V时ADC通道非线性度小于1%,无杂散动态范围约60 dB,灵敏度系数取8.26 mm时位置分辨率优于10 μm,测试结果满足HEPS逐束团BPM的需求。     

电动汽车复合电源在环测试平台研究概况

电源是电动汽车动力系统的核心部件,复合电源技术已成为现代新能源电动汽车发展的关键技术之一.介绍了电动汽车及车载电源的发展,阐述了复合电源性能测试研究方法,分析比较了国内外复合电源性能测试平台的研究现状,提出了复合电源性能在环测试平台存在的问题.     

Biomimetic Modification of Water-Borne Polymer Coating with Carnauba Wax for Controlled Release of Urea

Benefitting from the special structure of the leaf cuticle layer, plants have natural hydrophobicity and anti-fouling abilities. Inspired by the leaf surface structure, a biomimetic modification strategy was raised to improve the surface hydrophobicity of polyacrylate coating for controlled release fertilizer. Double-layer (polyacrylate and carnauba wax) coated fertilizer was obtained after biomimetic modification. The quality of controlled release fertilizer modified with the carnauba wax was greatly enhanced, and the coating material was effectively saved. The surface appearance of polyacrylate-coated fertilizer was improved for the surface blemish was repaired by the loaded carnauba wax. The characterizations by Fourier transform infrared spectroscopy indicated that the hydrogen bonds were formed between the water-based polyacrylate membrane and the carnauba wax layers. By optimizing the content of polyacrylate and carnauba wax, the release duration of the fertilizer was effectively prolonged, which was improved from 1 month to more than 2 months after the biomimetic modification. Therefore, biological wax as an environmentally-friendly natural material that has showed a broad potential in the application of coated controlled release fertilizer.     

Sensing Matrix Optimization for Multi-Target Localization Using Compressed Sensing in Wireless Sensor Network

In the multi-target localization based on Compressed Sensing(CS), the sensing matrix’s characteristic is significant to the localization accuracy.To improve the CS-based localization approach’s performance, we propose a sensing matrix optimization method in this paper, which considers the optimization under the guidance of the t%-averaged mutual coherence. First, we study sensing matrix optimization and model it as a constrained combinatorial optimization problem. Second, the t%-averaged mutual ...     

基于IWT和HVS的彩色图像盲水印算法

针对目前大多数图像水印技术是关于灰度图像并且基于离散小波变换的研究,提出了一种基于整型小波变换（Integer Wavelet Transform,IWT）将彩色数字水印嵌入到彩色宿主图像中的算法。采用YCbCr色彩空间的Y分量嵌入水印,利用人类视觉系统特性（Human Visual System,HVS）实现彩色水印嵌入位置的自适应确定;彩色水印的提取不需要原始水印和原始宿主图像。实验证明,嵌入水印后的图像具有很好的不易觉察性,并且对常见的图像处理操作具有很强的鲁棒性。     

基于SPKI的分布式委派凭证存储框架

信任管理(TM)是面向开放多域环境的分布式授权技术。TM系统从网络中搜索委派凭证以进行分布式授权决策,面临效率和可用性问题。本文提出一种基于SPKI的分布式凭证存储框架,将委派凭证冗余地存储到相关实体,以避免委派凭证的动态搜索过程,有助于解决现有TM系统凭证管理的局限性。     

火力发电厂在役凝汽器管超声导波检验的可行性

在介绍超声导波的检测特点、工作原理及超声导波在国内外的应用的基础上,详细比较了采用超声导波与涡流检测凝汽器管的优缺点,得出超声导波是一种新型的快速评估管道缺陷的检测技术,具有检测速度快,检测效率高,不需要对检测对象进行预处理等特点,适合于在役凝汽器管的检验的结论。     

GIS硬件平台建设实践

介绍了吉林省电力有限公司输变电生产管理地理信息系统（GIS）初期部署方案和所采用的负载均衡平台架构,并对其进行了分析,指出这种架构具有让所有用户直接访问统一的IP地址、不用人为干预协调也可以保证服务器的互相备份、能保证系统稳定等技术优势。     

基于模极大值小波域和TLS-ESPRIT的振荡瞬态识别方法

对于电能质量扰动检测和定位中振荡瞬态的检测、识别,目前普遍采用的是时频特征矢量提取和智能模式识别方法,此类方法无法准确提取电能质量振荡瞬态信号不同频率分量的组成。结合模极大值小波域和总体最小二乘法旋转不变技术的信号参数估计(total least squares-estimation of signal parameters via rotational invariance techniques,TLS-ESPRIT)可以很好地实现振荡信号的检测与识别。对于输入信号,首先采用模极大值小波域检测振荡发生的起始时刻和终止时刻,然后利用振荡时间间隔内的信号建立观测空间矩阵,通过奇异值分解和总体最小二乘法实现特征值截尾,将采样信号观测空间分解为信号子空间和噪声子空间,得到振荡信号每个构成频率分量的相应参数。仿真结果证实了所提出方法的可行性。     

一致性劈绕射理论在无源雷达绕射损耗中的应用研究

介绍了一致性劈绕射(UTD)的基本原理,推导了该理论下的一致性劈绕射场的分布表达式.以传统的劈绕射模型为基本参照,结合无源雷达电波传播特性,提出了以一致性劈绕射理论为基础的无源雷达绕射损耗模型,研究了有耗介质的无源雷达电波传播绕射损耗问题,并对该模型进行了仿真分析,为无源雷达电波传播遇到障碍物时电波的绕射损耗计算、分析、评估及应用提供了参考.