虚拟现实在远程教学中的应用

首先介绍了当前VRML和远程教学的概况 ;然后以开发“基于Web的立体几何课程多媒体CAI系统”为例 ,论述了虚拟现实技术应用于远程教学的意义 ,并说明该系统的开发步骤及相关技术。     

综合电子战作战效能仿真系统研究

综合电子战作战效能仿真系统是用于研究和评估综合电子战系统在攻防对抗环境下作战效能的计算机仿真系统。该文首先分析了国内外在电子战作战效能仿真领域内的研究现状，然后重点论述了该信真系统的技术实现思路，最后对该仿真系统的应用前景进行了展望。     

A QoS Management and Control Architecture for Intranet

With the appearance of application, such as VoIP and VOD, traditional best-effort service of network cant meet the needs of these applications. This paper proposes a QoS management and control architecture for Intranet, through which guaranteed services of network can be implemented in Intranet. In this architecture, there is a QoS control server, which is responsible for QoS control and management,while the router forwards packets according to the command from it.     

Temperature sensitivity of passive holographic wavelength-division multiplexers-demultiplexers

We derive a set of concise formulas to characterize the temperature sensitivity of holographic wavelength-division multiplexers-demultiplexers (H-MUX's-H-DMUX's). The normalized parameters such as dispersion abilities, central wavelength shift rate, and variations of insertion loss hold for general grating-based wavelength-division multiplexing-demultiplexing (WDM-WDDM) structures. The results are applicable to both wide-WDM-WDDM and dense ones working in 800-, 1300-, and 1550-nm optical wavelength windows, regardless of whether their input-output ports are single-mode or multimode fibers. Detailed analysis and experiments are carried out on a fully packaged four-channel H-MUX-H-DMUX. The experimental results at temperatures from 25 to 80 degrees C fit nicely with the theoretical prediction. We conclude that passive grating-based H-MUX's-H-DMUX's are promising for meeting the requirements on temperature sensitivity in optical data communications and telecommunications. Most of the analysis can be applied to other types of Bragg-grating-based WDM-WDDM.     

横切割头掘进机载荷谱的测定及分析

论述了横切割头式掘进机的载荷谱测试方法，在对载荷信号进行了时域统计、功率谱分析与幅值域统计后，得到了这种掘进机的工作载荷谱．这些实测数据不仅对掘进机的结构改进和动态性能以及工作可靠性的提高有很大帮助，对其他新型更大功率机型的开发亦有重要的参考价值．     

优化设计程序设置计算约束的研究

由于优化设计程序有时出现arcsin(A)或arccos(A)中的|A|>1及B~(1/2)中的B<0的问题,造成计算机停止运行,浪费了大量的机时.本文中提出在程序中设置计算约束,经用复合形法、惩罚函数法对实例作计算,有效地解决了上述问题,提高了优化程序质量.     

双臂机械手工作空间

双臂机械手与单臂机械手比较,能较好地完成装配和搬运重物等工作。当双臂机械手搬运物体从一个位置到另一个位置时,机架、两个臂和被夹持物体构成一个封闭系统。双臂机械手的运动将受到两手部夹持器与被夹持物体之间相对位置和姿态的影响。本文提出了确定双臂机械手搬运物体时的工作空间的方法。建立了数学模型和约束方程;提出了优化的目标函数和设计变量。在文中还研究了确定双臂机械手公共工作空间的方法。导出了双臂机械手公共工作空间的边界轮廓方程,最后给出一个数字实例来说明。     

建立"FORWARD专栏",推动国产测井软件的发展和应用

国产测井评价软件Forward是CNPC石油勘探应用软件的一个组成部分,是我国第一套具有独立版权、商品化的功能比较齐全的测井处理评价软件.     

Thermal fixing of 10,000 Holograms in LiNbO3:Fe

We discuss thermal fixing as a solution to the volatility problem in holographic storage systems that use photorefractive materials such as LiNbO(3):Fe. We present a systematic study to characterize the effect of thermal fixing on the error performance of a large-scale holographic memory. We introduce a novel, to our knowledge, incremental fixing schedule to improve the overall system fixing efficiency. We thermally fixed 10,000 holograms in a 90 degrees -geometry setup by using this new schedule. All the fixed holograms were retrieved with no errors.     

农田水利建设的新思路新方法新突破

农田水利建设是农业基础设施建设的中心环节。建设现代新型农田水利要有新思路、新方法、新突破．概括为围绕一条主线、坚持五项原则、健全五大体系、实现五个目标、落实八项措施，形成综合实力强大、宏观调控有力、科技含量较高、管理服务高效、综合效益显著、发展后劲充足的现代新型农田水利事业．