居住区环境设计新思维初探──跨世纪住宅设计竞赛的思考与研究

本文结合’96上海国际住宅设计竞赛方案，就居住区环境设计的理论与方法进行了探讨。     

詹明信谈库哈斯、建筑和空间

文章讨论了美国杰出的马克思主义批评家詹明信在全球资本主义的历史背景中,如何阐述库哈斯的建筑,他的建筑与后现代主义建筑之间有何差异,这种差异如何形成并给出有意义的诠释。     

On rotations and translations with application to robot manipulators

Robot motion is described by a set of positions and orientations of the robot's end-effector relative to some base coordinate system. Different methods to describe this motion are available and most of them are presented in this paper. Methods for position vector, free vector, and line vector transformation are presented and compared, and the advantages and disadvantages, the simplicity, and the number of arithmetic operations required of the different methods are addressed. An example of the application of these methods to a six degree-of-freedom robot is given.     

Lunar Habitat Micrometeoroid and Radiation Shielding: Options, Applications, and Assessments

Various shielding approaches to protect lunar habitats from micrometeoroid and radiation hazards present major trade-off considerations. Popular scenarios that envision covering modules with in situ regolith will necessitate means to excavate and move large amounts of material; will complicate evolutionary outpost growth; and may require long tunnels between connecting pressurized elements. Strategies that incorporate shielding materials into module structures or internal shelters add very substantial launch mass penalties. Utilization of water bladders can make efficient use of consumable/recyclable supplies, but may impose excess capacity deliveries at early development stages. This paper addresses these different shielding approaches from a top-level application perspective, highlighting pros and cons of each. Examples draw upon research and design investigations undertaken by the Sasakawa International Center for Space Architecture in support of separate National Aeronautics and Space Administration (NASA) contracts awarded to teams headed by Boeing and ILC-Dover for a “Minimum Functionality Habitation Systems Concept Study.” Comprehensive team study results were presented to NASA in February 2009, and have been released as public information.     

Study of silicon photomultipliers fast amplifier and thermoregulation

The silicon photomultipliers (SiPM) are adopted in various physical applications, from medical physics to astrophysics, for their advantages in terms of cost and weight with respect to traditional photo detectors. Their low bias voltage supply (about 30 V), hardiness and resistance to magnetic field are ideal characteristics for space application. In the frame of INFN-Irst collaboration, some of them have been developed and produced at FBK (Trento-Italy), and have been characterized in the INFN laboratories of Bologna (DaSiPM2 collaboration).The SiPM can be used in conjunction with fibres and counters in high energy physics experiments. To exploit the SiPM time resolution, a fast amplifier has been studied. The SiPM gain depends critically on temperature and a thermal stabilization is also necessary. The use of a thermoelectric cooler module based on a Peltier cell has been investigated, and the results are shown.     

基于模糊神经网络直接转矩控制系统设计

针对传统的直接转矩控制中存在转矩、定子磁链波动大的问题,提出了一种结合空间矢量调制的模糊神经网络直接转矩控制方法。它运用模糊神经网络得到期望的任意相位空间电压矢量,再结合空间矢量调制直接对逆变器的开关状态进行控制,以达到减小转矩、定子磁链波动的目的。最后以TMS320F240为核心搭建了一个直接转矩控制系统,通过采集实验数据,分析该直接转矩控制系统与传统的直接转矩控制系统相比磁链和转矩波动明显减少,并具良好的响应性。     

Realization of quick-look imaging for spaceborne SAR based on parallel processing

Large range cell migration is a severe challenge to imaging algorithm for spaceborne SAR. Based on design of Finite Impulse Response (FIR) filter and Range Doppler (RD) algorithm,a realization of quicklook imaging for large range cell migration is proposed. It realized quick-look imaging of 8 times reduced resolution with parallel processing on memory shared 8 CPU SGI server. According to simulation experiment, this quick-look imaging algorithm with parallel processing can image 16384x16384 SAR raw data within 6 seconds. It reaches the requirement of real-time imaging.     

天文全帧CCD图像拖尾的快速去除方法

在长时间的天文光电观测系统中,为降低运行成本,往往拆除机械快门。但对于天文全帧CCD相机而言,其由此产生的拖尾严重影响了目标的检测性能。本文首先根据全帧CCD的工作机理,从理论上分析了CCD图像拖尾产生的原因。结合实际工程对空间目标检测的实时性需求,提出一种快速而有效地去除恒星目标竖直拖尾和空间目标倾斜拖尾的方法。最后结合实测数据和硬件平台,验证了该方法的有效性及实时性。      

2006年国外航天运载器发展回顾

对2006年国外航天运载器的发射以及研制情况进行了回顾,并对2007年国外运载器的发展进行了展望.     

用于空间聚光结构的折展机构设计与分析

针对空间太阳能电站大口径聚光结构的应用需求与运载条件相矛盾的情况,以离轴式聚光系统为研究基础,设计了一种具有折叠展开功能的次镜支撑机构。机构采用三关节串联结构为主,两组平行四杆机构为辅,可实现水平、竖直的两次展开,并能保证次镜组件在展开过程中始终保持平动状态。通过建立机构折展的运动学方程,对机构的工作空间进行了求解,规划了展开方案;对机构展开的位置、姿态精度进行了研究,分析了展开精度对机构各结构参数的敏感度;最后,在ADAMS软件中建立了折展机构的虚拟样机,对展开过程进行了仿真,验证了机构设计的正确性与合理性。