位移和速度反馈的数学模型及实现方法

本文提出了位移和速度同时反馈的数学模型 .并给出了位移和速度反馈的实现方法 ,该方法用传统的差动变压器实现了位移和速度的同时反馈     

二阶非线性微分方程的斜周期边值问题

In this paper a uniqueness theorem for a skewperiodic boundary value problem is obtained. By using the optimal control method, we derive the best estimate for the integration mean ensuring that the results hold.     

无线信道中的电波传播

分析了信号在无线信道中传输时所经受的两种衰落,介绍了主要的无线传播模型,在此基础上提出了对抗衰落的措施。     

循环冷却水自动加药控制系统

针对工业循环冷却水的处理问题，开发了循环冷却水自动加药控制系统。重点介绍了该系统的总体结构，控制方案及管理软件设计，该系统的投用可大大提高循环冷却水处理的自动化水平并可取得显著的经济效益。     

新一代智能城域光网络

本提出了一种标准化的光控制平面。阐明了开了用于光传输网的控制平面所遇到的选择与挑战。光控制平面被分解成邻居发现、服务发现、连接控制和拓扑、资源发现等几个基本的过程。不同的网络组织和分割导致了几个不同的自动配置模型：软性持久链路模型、用户接口模型和对等模型。这是构成以IP为中心的光传输网的控制和管理基础。同时也介绍了基于SDH光交换的新一代CIENA公司智能光网络，它具有大容量光交换能力和网络拓扑结构自动发现、端对端电路配置、带宽动态分配等功能及特点，将大大提高数据、电路业务的服务质量，新一代智能光网络是干线和城域网络交换传输最佳的选择。     

OPTIMAL INSTAR PARASITIZATION IN A STAGE STRUCTURED HOST-PARASITOID MODEL

A stage structured host-parasitoid model is derived and the equilibria studied. It is shown under what conditions the parasitoid controls an exponentially growing host in the sense that a coexistence equilibrium exists. Furthermore, for host populations whose inherent growth rate is not too large it is proved that in order to minimize the adult host equilibrium level it is necessary that the parasitoids attack only one of the larval stages. It is also proved in this case that the minimum adult host equilibrium level is attained when the parasitoids attack that larval stage which also maximizes the expected number of emerging adult parasitoid per larva at equilibrium. Numerical simulations tentatively indicate that the first conclusion remains in general valid for the model. However, numerical studies also show that it is not true in general that the optimal strategy will maximize the number of emerging adult parasitoid per larva at equilibrium.     

CAD8903机芯的视频音频转换电路设计

本文概要介绍了CAD 8903机芯采用国产集成电路CD7680,CD74211,DG4053实现音频、视频切换功能的电路,并对CD7680中音频信号处理电路的特殊用法进行了说明。     

Photoluminescence study in step-graded composition InxAl1−xAs/GaAs

We report on the lattice-mismatched growth of step-graded In_xAl_1−xAs buffer layers on GaAs (0 0 1) substrates by molecular beam epitay (MBE). The approach to growing highly lattice-mismatched epilayers is to interpose a buffer layer between the substrate and the active layer. Two samples G30 and G40 with active layer compositions, respectively, x = 0.46 and x = 0.41, are studied by photoluminescence (PL). At low temperature, the PL spectra show a large broadened band whose energy and intensity depend on the active layer composition. The step-graded layer compositions improved the crystalline quality of these structures and increase the active layer PL band intensity.     

高性能IGBT模块的设计考虑

本文对ＩＧＢＴ模块中功率芯片（ＩＧＢＴ和续流二极管）的优化设计进行了讨论。通过优化几个重要的工艺参数并改进器件的结构，ＩＧＢＴ不仅有足够的短路容量，而且正向压降与电流下降时间之间可实现最佳折衷。另外，续流二极管的反向恢复特性也有明显改善。通过采用衬底控制技术，ＩＧＢＴ模块的输出特性不受温度的影响，输出电流更稳，输出阻抗更高。本文详细介绍了整个设计考虑。     

ATM网络中漏桶流量控制特性的研究

本文对ＡＴＭ（异步转移模式）网络中话音、数据和图像业务的漏桶流量控制特性进行了研究。计算机模拟结果表明，由于各种业务内在的相关性不同，相应的漏桶流量控制特性有较大的差异。漏桶参数的选择对于各种业务具有不同的公平性，因而应根据业务的特性来设计漏桶参数。