固体火箭发动机燃烧室两相流粒子运动轨迹的实验研究

本文用Ｘ射线高速实时荧屏分析（ＲＴＲ）技术对固体火箭发动机燃烧室内两相流粒子的运动轨迹进行了实验研究。为增强粒子图象的效果,设计了一个专用的矩形实验发动机,用在双基推进剂上开槽添加钨粉的方法来模拟含铝复合推进剂中的铝粒子。实验拍摄到了比较清晰的ＲＴＲ图像,经过图象处理后得到粒子群的运动轨迹。实验结果表明：１）粒子轨迹完全有可能穿过对称轴;２）重力对粒子轨迹的影响很小。实验结果为ＳＲＭ两相流动模型的建立以及两相流动数值模拟结果的验证提供了实验依据。     

RTR高空探测系统技术方案

RTR高空探测系统保留了无线电经纬仪的优点，增加了测距功能，具有较好的低仰角测风精度。文章重点介绍了其测距装置的工作原理和作用及测距方法。     

一种可进化人工神经网络的结构设计及其在舰船雷达目标识别中的应用

设计了一种基于GA的带有可进化性的ANN的体系结构，并将该结构应用于舰船雷达的目标识别中。实验结果表明，经GA的优化搜索，这种经过改善的有进化能力的ANN结构，在舰船雷达目标识别中取得了较好的效果．     

基于概率分布及维度编码的关联规则挖掘

设计一种基于二进制数及项目的支持度分布的Apriori改进算法BF-Apriori。该算法通过分析项目的概率分布并对项目集中的项目按概率从大到小进行排序,经维度编码为二进制数后,降低事务数据库的读取开销和存储开销,同时采用切片运算和剪枝技术降低规则挖掘运算的时间复杂度。实验结果表明,BF-Apriori算法降低了50%左右的存储开销及400%以上的执行时间,能提高数据挖掘的存储效率和运算速度。     

Reverse-trace routing scheme in content centric networking

Content center networking （CCN） is one of the most promising future network architectures. Current researches on CCN routing scheme mainly focus on finding the best single routing path, which may induce to low usage of the in-network caches. In order to overcome this problem, a reverse trace routing （RTR） scheme is proposed in this paper, in which Interest packet is sent to the edge-cache along with the reverse trace of the corresponding former Data packet. By doing this, the Interest packets will have better chances to be routed to the promising in-network caches before reaching the source server, which could increase the in-network hit rate, while decrease the server stress. The simulation results show clearly that the RTR scheme decreases the source server load, while reducing the mean hops of entire data retrieval process under certain circumstances.     

Structural defects in laser crystallized silicon ribbons and their influence on photovoltaic behaviour

Analysis of structural defects in laser crystallized silicon sheets has been carried out. It is found that (non-equilibrium) defect structure strongly depends on growth parameters such as thermal profiles, ambient gases and the operational laser parameters. Laser crystallization with intense beams can lead to surface defects which are formed by convection flow in the melt (Marangoni effect). Characteristic defects due to various growth ambients are outlined. Influences of ribbon defects on photovoltaic performance are also described. By properly controlling growth conditions, high quality sheets have been grown which yield solar cell efficiency ∼ 13%, and better performance can be predicted based on projected improvements in growth conditions.     

富燃料推进剂端面燃烧规律的X射线诊断研究

利用X射线高速实时荧屏分析技术（RTR）,针对燃气发生器铝镁富燃料推进剂端面燃烧规律开展了内视研究。实验成功采集了富燃料推进剂燃面推移图像,表明燃面是沿轴线以平端面进行推移。文中结合实验对端面燃烧规律和P—t曲线进行了分析。     

焊管RTR系统动态灵敏度的分析探讨

X射线实时成像（简称RTR）系统中,RTR图像质量的主要指标是空间分辨率和对比灵敏度。RTR系统通常把对比灵敏度分为静态灵敏度和动态灵敏度。在实际检测过程中,对静态灵敏度的理解基本一致,而对动态灵敏度则有不同的表述。焊管行业射线探伤中,RTR系统用来体现灵敏度最常用的是金属丝像质计,介绍了荧光检验用ISO和ASTM金属丝像质计的适用范围。对比了我国标准和ASME标准对动态灵敏度描述的区别。     

计及负荷时变性及分布式电源出力波动性的配电网两级实时重构

针对分布式电源(distributed generation,DG)接入配电网的特点提出两级实时重构的概念。两级实时重构是指正常运行方式下的最大概率重构(maximum probability reconfiguration,MPR),以及当DG出力或者负荷出现较大波动时,网络拓扑快速响应为实时重构(r e a l-t i m ereconfiguration,RTR)的运行方式。所提两级实时重构模型及方法重点考虑了DG出力和负荷的时变性、负荷的静态电压特性以及配电网的三相不平衡特性。文中比较了4种配电网重构方式的网损和网损率:始终维持原始拓扑结构、15 min实时重构、两级实时重构以及系统在额定负荷和额定DG出力水平下的最优重构。改进的IEEE 16节点和IEEE 34节点配电系统的仿真分析表明,所提的两级实时重构方法不仅能有效降低系统网损,同时提高了系统运行的安全性和可靠性。     

Run-Time Reconfigurable Systems for Digital Signal Processing Applications: A Survey

Todays digital signal processing (DSP) applications use computationally complex and/or adaptive algorithms and have stringent requirements in terms of speed, size, cost, power consumption, and throughput. Efficient hardware implementation techniques should be employed to meet the requirements of these applications. Run-Time Reconfiguration (RTR) is a promising technique for reducing the hardware required for implementing DSP systems as well as improving the performance, speed and power consumption of these systems. In this survey, we explain different issues in run-time reconfigurable systems and list the implemented systems which support run-time reconfiguration. We also describe different applications of run-time reconfiguration and discuss the improvements achieved by applying run-time reconfiguration.Alireza Shoa received his B.Sc degree in Electrical Engineering from Sharif University of Technology, Tehran, Iran in 2001 and M.A.Sc degree in Electrical Engineering from McMaster University, Hamilton, Canada in 2003. Currently, he is a PhD candidate in Electrical Engineering at McMaster University. His research interests include VLSI circuits for signal processing and communication applications and image and video processing.Shahram Shirani received his B.S. in Electrical Engineering from Isfahan University of Technology, Isfahan, Iran, and M.Sc. in Biomedical Engineering from Amirkabir University of Technology, Tehran, Iran, and Ph.D. in Electrical Engineering from University of British Columbia, Vancouver, Canada, in 1989, 1994 and 2000 respectively. Since 2000 he has been with the department of Electrical and Computer Engineering, McMaster University, where he is an assistant professor. His research interests include image and video compression, multimedia communications, and ultrasonic imaging. He is a member of technical committee of IEEE International Conference on Image Processing (ICIP). He is a licensed professional engineer and a member of Institute of Electrical and Electronics Engineers (IEEE).