基于DSP和CPLD的数字化转台伺服系统的设计与实现

介绍了一种数字化转台伺服系统的设计及其实现．在设计中使用了数字信号处理器(DSP)以及复杂可编程逻辑器件(CPLD)，有效地降低了模拟电路中噪声、漂移等固有因素的影响，使得系统具有较高的精度。实验证明了该方案的实用性和有效性。     

基于DSP的MIMU/GPS组合导航系统研究

介绍了一种以DSP为核心的MIMU／GPS组合导航系统设计，它具有体积小、成本低等优点。针对系统噪声难于准确统计的情况，系统采用了一种适用于系统噪声协方差阵未知情况下的自适应卡尔曼滤波算法，用它作为组合算法，并对组合导航系统进行了数字仿真。结果表明：该自适应滤波算法可以有效地抑制滤波发散，增强了系统对环境的适应性。     

无人机光电载荷图像处理器的设计

介绍了无人机载设备的技术特点及机载小型图像处理器的组成。采用TI公司的数字信号处理器芯片为核心处理器,配合现场可编程逻辑器件（FPGA）与外部管理微控制单元（MCU）来实现目标数据的采集与处理,设计了适用于无人机光电载荷的超小型图像处理器系统。针对机载设备的特点,设计时充分考虑了体积、重量、功耗等要求。该系统已应用于多台套机载光电载荷中,工作稳定可靠,满足无人侦察机对捕捉和定位目标的要求。     

单机排序问题最优解的结构及其求法

本文研究了单机排序问题|r_i=0|∑|c_i-d_i|最优解的结构．提出了最优解的紧密规则，以及最优解的近似求法．     

用于电视跟踪系统的并行体系结构研究

本文从计算机并行体系结构的角度研究了适用于电视跟踪器系统的结构,针对其大数据流量与极高处理速度的特点,提出了多指令流多数据流(MIMD)和双总线的布局,达到了电视信号实时处理的目的,实际使用结果证明分析和设计正确、合理,技术先进.     

脉冲式光电编码器信号的检测研究

介绍了用单片计算机对脉冲式光电编码器信号进行智能检测的方法。这方法不用专用辨向细分电路，只用一个计数器和一个二输入电平口完成计算机与编码器的连接。主要功能如速度判断、方向和变向判断、位移脉冲累加、细分、输出与通迅等依靠软件和单片机内部功能实现。并且通过单片机智能地克服了目前硬件辨向细分电路在变向、抖动和快速情况下不能保证四分之一周期分辨率的缺陷。     

Asynchronous replica exchange for molecular simulations

An asynchronous implementation of the replica exchange method that addresses some of the limitations of conventional synchronous replica exchange implementations is presented. In asynchronous replica exchange pairs of processors initiate and perform temperature replica exchanges independently from the other processors, thereby removing the need for processor synchronization found in conventional synchronous implementations. Illustrative calculations on a molecular system are presented that show that asynchronous replica exchange, contrary to the synchronous implementation, is able to utilize at nearly top efficiency loosely coupled pools of processors with heterogeneous speeds, such as those found in computational grids and CPU scavenging environments. It is also shown that employing non-nearest-neighbor temperature exchanges, which are straightforward to implement within the asynchronous algorithm, can lead to faster temperature equilibration across processors.     

Hydrogen Production by Catalytic Reforming of Gaseous Hydrocarbons (Methane &; LPG)

Hydrogen has been attracting great interest as a major energy source in near future. The lack of an infrastructure has led to a research effort to develop fuel processing technology for production of hydrogen. In this review, we are reporting the catalytic reforming of gaseous hydrocarbons carried out in our research group, covering dry-reforming of CH₄, tri-reforming of CH₄, the electrocatalytic reforming of CH₄ by CO₂ in the SOFC (solid oxide fuel cell) system and steam reforming of LPG. Especially, we have focused on our work, though the related work from other researchers is also discussed wherever necessary. It was found that tri-reforming of CH₄ over NiO–YSZ–CeO₂ catalyst was more desirable than dry-reforming of CH₄ due to higher reforming activity and less carbon formation. The synthesis gas produced by tri-reforming of CH₄ can be used for the production of dimethyl ether, Fischer–Tropsch synthesis fuels and high valued chemicals. To improve the problem of deactivation of catalyst due to carbon formation in the dry reforming of CH_4, the internal reforming of CH₄ by CO₂ in SOFC system with NiO–YSZ–CeO₂ anode catalyst was suggested for cogeneration of a syngas and electricity. It was found that Rh-spc-Ni/MgAl catalyst showed long term stability for 1,100 h in the steam reforming of LPG under the tested conditions. The addition of Rh to spc-Ni/MgAl catalyst restricted the deactivation of catalyst due to carbon formation in the steam reforming of LPG and diesel under the tested conditions. The result suggested that the developed reforming catalysts can be used in the reforming process of CH₄, LNG and LPG for application to hydrogen station and fuel processor system.     

基于巨磁电阻的转速测量在实验教学中的应用

介绍了巨磁电阻梯度传感器工作原理,设计、制作了适用于实验教学的巨磁电阻转速测量实验装置,实现了通过单片机对步进电机转速的控制及对被测转盘转速的实时测量,给出了电机工作在不同转速状态下的测量结果,验证了同步电机转速与控制频率的变化关系。     

离子发动机交换电荷离子返流的粒子模拟

 建立了离子发动机羽流的物理模型,采用粒子网格对羽流中的交换电荷离子的分布进行了模拟,电场方程使用完全近似格式的代数多重网格方法求解。利用计算设备统一架构技术开发出一套基于图形处理器的3维并行粒子模拟程序。计算结果表明,交换电荷离子在径向扩张型电势结构下会向束流区外运动,一部分交换离子在电场力作用下会向发动机上游运动,从而形成返流。发动机上游区域的交换电荷数密度与束流等离子体数密度相比降低了3~4个数量级。通过降低电子温度可有效降低返流电流。