On clutter dof for phased array airborne early warning radars

In recent years, considerable attention has been paid to adaptive clutter suppression for airborne early warning (AEW) radars. A necessary condition for efficient clutter suppression is that the number of adaptive degrees of freedom (DOF) is no less than that of clutter DOF. This paper analyzes the DOF of clutter for phased array AEW radars. The new results obtained here are helpful to design and adaptive system for clutter suppression.     

多Transputer网络的构造及其流水线操作的实现

介绍了Transputer的特性,着重论述建立多Transputer拓朴互连网络的一般方法,讨论了在多Transputer并行处理网络上实现流水线操作,并给出实例.     

A BiCMOS dynamic carry lookahead adder circuit for VLSIimplementation of high-speed arithmetic unit

A BiCMOS dynamic carry lookahead circuit that is free from race problems is presented. A 16 b full-adder test circuit, which has been designed based on a 2 μm BiCMOS technology, shows a more than five times improvement in speed as compared to the CMOS Manchester carry lookahead (MCLA) circuit. The speed advantage of the BiCMOS dynamic carry lookahead circuit is even greater in a 32- or 64-b adder     

机载雷达时-空二维部分联合自适应处理

本文在进一步分析机载侧面阵雷达二维联合处理与级联处理之差异的基础上,提出了一种对阵元误差具有较高容差能力的二维滤波新方法,先用降维变换将时空二维场数据变换到低维空间,再进行联合域波束空间部分自适应处理。     

交流薄膜电致发光显示器灰度产生方法的探讨

本文介绍了交流薄膜电致发光显示器几种灰度产生的原理以及实现方案,并对这些方案进行了分析和对比。探讨了一种实现更高灰度级的新方案。     

YKGX—1油库微机控制管理系统

本文介绍了一种分布式油库自动化控制,管理微机系统YKGX-1。重点介绍了其功能、组成、原理及特点。经实际运行证明,YKGX-1系统实现了油库收、发、存、管理一体化,系统自动化程度高,发油精度优于3‰。     

Study and design of step-index channel waveguide bends withlarge-angle and low-loss characteristics

By using micro-prisms, improved three-dimensional (3-D) bends of the embedded and buried waveguides of step-index profile are proposed. A simple phase compensation rule for the optimal design of the micro-prism is also presented. Through the simulation of 3-D semivectorial finite-difference beam propagation method, the transmission characteristics of the improved bends are shown to have been enhanced dramatically as compared with those of the conventional ones. Even for a bend angle of as large as 10°, the normalized transmitted power can still be greater than 95%. These results of 3-D bends are then compared with those of the two-dimensional (2-D) ones which are simplified from 3-D structures by the effective index method, and physical explanation of the discrepancy between the 3-D and 2-D results is introduced. The influences of waveguide structures and prism parameters on the transmission characteristics are discussed in detail. Some criteria for the design of large-angle low-loss 3-D improved bends are also accessed     

开博通对激光血管成形术后平滑肌细胞增殖周期的影响

采用球囊拉伤动脉内膜加高脂饲养建立兔髂动脉粥样硬化模型．对模型兔进行Ｎｄ：ＹＡＧ激光血管成形术。应用流式细胞计数仪分析细胞中ＤＮＡ含量。结果表明，治疗组血管平滑肌细胞周期中增殖细胞数明显低于对照组，提示开博通能抑制激光血管成形术后血管平滑肌细胞的增殖。     

64位声表面波可编程抽头延迟线

本文叙述了一种64位声表面波可编程抽头延迟线的结构及性能参数,采用专门设计的有源三极管作开关阵列单元,获得一个时钟速率大于1MHz,可编程速率为15kbit/s的器件。该器件性能基本满足系统实验要求,但在稳定性及波形一致性方面有待进一步提高。     

STABILITY ANALYSIS OF ARTIFICIAL NEURAL NETWORKS UNDER RANDOM PERTURBATION

Based on the theory of stochastic differential equation,the stability of a kind ofcontinuous-time generalized Hopfield neural networks with white noise perturbation is studiedin the paper,and the related stability criteria and design requirements of neural networks areestablished.