城市公用基础设施综合信息库

本文根据建立城市路面管理系统的成功经验，为配合适应现代化城市建设与发展的需要，不断提高城市公用基础设施的现代管理水平，提出了建立城市公用基础设施综合信息库的基本框架。     

对共轭齿廓曲率计算Baxter方法的改进

对计算共轭齿廓曲率的Ｂａｘｔｅｒ法作了一些改进，对其基本公式重新作了简洁的推导，在推导过程中先后令啮合点的相对运动速度沿两个互相垂直的方向，由微分几何的基本公式直接得出包络面的曲率参数。     

对机械零件计算机辅助设计课程教学的探讨

计算机辅助设计课程的目的和作用,教学内容以及具体做法。     

步进电机可变细分SPWM运行方法

提出ＳＰＷＭ新方法实现可变细分技术驱动步进电机，使步进电机各相电流接近正弦波，以模拟同步交流电动机的圆形旋转磁场，消除了电机就进运行工况，使电机出轴匀速旋转。也避免了同步电动机变步调速的局限性，获得了步进电机无脉运宽范围的速度调节功能，实现步时电机的恒转矩细分运行。     

微机模拟几何量检测系统的设计与研究

介绍了精密几何量的微型计算机模拟系统的设计方法及运用人机工程原理和多媒体技术实现声像结合及控制的实现思路。     

The Effect of Additives on Cu/HZSM-5 Catalyst for DME Synthesis

The addition of ZnO or ZrO₂ into CuO/HZSM-5 was investigated for DME synthesis from syngas by using the reactive frontal chromatography method, TPR and in situ TPR. These promoters enhanced the catalytic activity of Cu/HZSM-5 and promotion with ZnO and ZrO₂ produced a maximum activity, which could be explained by the improvement of the dispersion of Cu and the promotion of CuO reduction. The Cu⁺ species existing during the reaction have been detected, based on which a Cu⁰ Cu⁺¹ redox cycle model was put forward.     

White organic light-emitting devices with non-doped-type structure

A non-doped-type structure was proposed for obtaining organic light-emitting devices with high-efficiency and full-spectrum white light emission. The device structure included indium tin oxide glass substrate/450 Å 4,4′,4″-tris{N-(3-methylphenyl)-N-phenylamin}triphenylamine (m-MTDATA) hole injection layer/100 Å N,N′-bis-(1-naphthyl)-N,N′-diphenyl-1,1′-biph-enyl-4,4′-diamine (NPB) hole transport layer/150 Å 4,4′-bis(2,2′-diphenylvinyl)-1,1′-biphenyl (DPVBi) blue emitting layer/ultrathin [2-methyl-6-[2-(2,3,6,7-tetrahydro-1H, 5H-benzo[ij] quinolizin-9-yl)ethenyl]-4H-pyran-4-ylidene] propane-dinitrile (DCM2) yellow-emitting layer/ 80 Å 4,7-diphenyl-1,10-phenanthroline (BPhen) electron transporting layer and hole blocking layer/600 Å tris (8-hydroxyquinoline) aluminium (Alq3) electron-transporting layer /10 Å lithium fluoride (LiF)/aluminum (Al). A white emission (Commission Internationale de l’Eclairage 1931 chromaticity coordinate) (X = 0.3556, Y = 0.3117) at 5 V and (X = 0.282, Y = 0.2658) at 15 V was obtained. Its luminance was 11,497 cd/m² at 15 V, and the maximum efficiency was 4.8 lm/W at 5 V.     

Kinematic analysis of a flexible six-DOF parallel mechanism.

In this paper, a new type of six-degrees of freedom (DOF) flexible parallel mechanism (FPM) is presented. This type of parallel mechanism possesses several favorable properties: (1) its number of DOFs is independent of the number of serial chains which make up the mechanism; (2) it has no kinematical singularities; (3) it is designed to move on rails, and therefore its workspace is much larger than that of a conventional parallel manipulator; and (4) without changing the number of DOFs and the kinematics of the mechanisms, the number of the serial chains can be reconfigured according to the needs of the tasks. These properties make the mechanism very preferable in practice, especially for such tasks as joining huge ship blocks, in which the manipulated objects vary dramatically both in weights and dimensions. Furthermore, the mechanism can be used as either a fully actuated system or an underactuated system. In the fully actuated case, the mechanism has six DOF motion capabilities and manipulation capabilities. However, in the underactuated case, the mechanism still has six DOF motion capabilities, but it has only five DOF manipulation capabilities. In this paper, both the inverse and forward kinematics are studied and expressed in a closed form. The workspace and singularity analysis of the mechanism are also presented. An example is presented to illustrate how to calculate the kinematics of the mechanism in both fully-actuated and underactuated cases. Finally, an application of such a mechanism to manufacturing industry is introduced.     

High Performance General-Purpose Microprocessors: Past and Future

It can be observed from looking backward that processor architecture is improved through spirally shifting from simple to complex and from complex to simple. Nowadays we are facing another shifting from complex to simple, and new innovative architecture will emerge to utilize the continuously increasing transistor budgets. The growing importance of wire delays, changing workloads, power consumption, and design/verification complexity will drive the forthcoming era of Chip Multiprocessors （CMPs）. Furthermore, typical CMP projects both from industries and from academics are investigated. Through going into depths for some primary theoretical and implementation problems of CMPs, the great challenges and opportunities to future CMPs are presented and discussed. Finally, the Godson series microprocessors designed in China are introduced.     

并行化编译器中基于工作量的条件并行化研究

并行化编译器通过发掘串行程序中的并行性来提高程序的运行性能。但当可并行的工作量与并行的线程数目之比较小时，有可能采用并行执行反而会降低程序的整体性能。本文工作基于SUIF结构．研究精确的工作量计算方法，并实现了基于工作量的条件并行化技术．有效地提高了并行程序的执行性能。