辛基磺酰氟的合成与表征

在氢氟酸存在下，以正辛硫醇（C8H17SH）为原料，NO2为氧化剂合成了辛基磺酰氟（C8H17SO2F）。运用IR、^1HNMR、GC—MS分析技术对辛基磺酰氟进行了表征。反应不产生副产物，二辛基二硫（C8H17SSC8H17）可回收为反应原料。并探讨了辛基磺酰氟的工业应用前景。     

Single event transient characterization of SiGe HBT by SPA experiment and 3-D process simulation

Science China Technological Sciences - The single-photon absorption induced single event transient in the silicon-germanium heterojunction bipolar transistor is investigated. The laser wavelength...     

Cooperative localization method for multi-robot based on PF-EKF

A method of cooperative localization for multi-robot in an unknown environment is described. They share information and perform localization by using relative observations and necessary communication. At initial time, robots do not know their positions. Once the robot that can obtain the absolute position information has its position, other robots use particle filter to fuse relative observations and maintain a set of samples respectively representing their positions. When the particles are close to s Gsussian distribution after a number of steps, we switch to an EKF to track the pose of the robots. Simulation results and real experiment show that PF-EKF method combines the robustness of PF and the efficiency of EKF. Robots can share the absolute position information and effectively localize themselves in an unknown environment.     

当代数字城市建设背景与技术路线

目前,数字城市建设面临着新的技术、理论、数据、社会与应用背景,上升为数字工程新阶段。基于对上述背景及数字工程理念的分析,提出了建设当代数字城市的技术思路。在对数据、网络和标准整合的基础上,建立数据平台和网络平台;然后,在对各种应用系统整合的基础上,采用先进的分布式计算和GIS等技术,构建数字城市基础信息共享平台;在以上基础上,结合专业模型应用技术与专题数据库,实现数字城市的各种应用,最终建立统一、集成、完备和智能化的数字城市基础设施。并以“数字常平”为例进行了分析论证。     

某大型水电站工程土石方平衡与调配规划

某大型水电站工程土石方开挖和填筑工程量大,做好土石方平衡规划对保证坝体填筑质量至关重要,因而在土石方平衡设计中,针对该工程特点及对填筑料的要求,本着“好料好用,差料差用、物尽其用”的原则,引入了“填筑对象-开挖料”分级的概念,将开挖料分为不同等级,用于不同的填筑对象,通过分级优先调配平衡,成功做到充分、合理地规划利用开...     

Proton-induced current transient in SiGe HBT and charge collection model based on Monte Carlo simulation

The study presents an investigation into the proton-induced current transient in a silicon-germanium heterojunction bipolar transistor (SiGe HBT). The temp     

用组件式GIS快速开发地理信息应用系统

从地理信息系统在数字郑州管理中的应用出发,从城市公交查询系统建立的必要洼出发,研究了基于组件式GIS的公交查询系统的设计。本系统选用GIS组件SuperMap Objects作为地理信息系统二次开发组件,通用语言Visual Basic6.0作为开发工具,Microsoft Access2000作为后台数据库,快速开发城市公交查询系统,实现了地图的放大、缩小、漫游等GIS软件的基本功能,以及公交换乘方案和地名的查询等空间查询功能：在介绍了系统总体设计、功能设计、数据库设计、界面设计及输入输出设计之后给出了系统中一些功能的实现原理与具体方法,最后展示了本系统的最后开发成果。     

Soft error reliability in advanced CMOS technologies—trends and challenges

With the decrease of the device size, soft error induced by various particles becomes a serious problem for advanced CMOS technologies. In this paper, we review the evolution of two main aspects of soft error-SEU and SET, including the new mechanisms to induced SEUs, the advances of the MCUs and some newly observed phenomena of the SETs. The mechanisms and the trends with downscaling of these issues are briefly discussed. We also review the hardening strategies for different types of soft errors from different perspective and present the challenges in testing, modeling and hardening assurance of soft error issues we have to address in the future.     

Parametrical analysis of the design and performance of a solar heat pipe thermoelectric generator unit

This paper describes a solar heat pipe thermoelectric generator (SHP-TEG) unit comprising an evacuated double-skin glass tube, a finned heat pipe and a TEG module. The system takes the advantage of heat pipe to convert the absorbed solar irradiation to a high heat flux to meet the TEG operating requirement. An analytical model of the SHP-TEG unit is presented for the condition of constant solar irradiation, which may lead to different performance characteristics and optimal design parameters compared with the condition of constant temperature difference usually dealt with in other studies. The analytical model presents the complex influence of basic parameters such as solar irradiation, cooling water temperature, thermoelement length and cross-section area and number of thermoelements, etc. on the maximum power output and conversion efficiency of the SHP-TEG. Simulation based on the analytical model has been carried out to study the performance and design optimization of the SHP-TEG.     

基于Mean-Shift的卡尔曼粒子滤波车辆跟踪算法研究

在视频车辆跟踪算法中针对传统粒子滤波的非线性、非高斯性可能导致跟踪过程的不准确性,提出一种基于Mean-Shift的卡尔曼(Kalman)粒子滤波算法。该算法利用建立基于目标颜色直方图特征模型对视频车辆目标进行建模,并将其与Kalman滤波相结合进行更新;通过采用Mean Shift算法将Kalman滤波器引用到粒子滤波器当中,通过预测迭代,从而达到对车辆的运行轨迹的修正。将先验信息预测与粒子滤波相结合在保持跟踪系统整体上的非线性、非高斯性,兼顾了卡尔曼滤波局部的线性高斯特性。实验结果表明,该方法与传统粒子滤波方法相比,具有较好的实时性和较高的准确率,能够准确稳定地对目标车辆进行跟踪。