基于CC1100的UHF RFID阅读器设计

采用ARM9系列的S3C2440作为CPU,CC1100作为射频收发器,设计特高频（UHF)RFID手持式阅读器。射频电路采用两片CC1100以解决单片不能同时收发信号的缺点,采用两级放大持续对阅读器连续供电,并对阅读器软件部分的防碰撞算法进行优化。结果表明,与传统时隙ALOHA防碰撞算法相比,改进的防碰撞算法的吞吐率维持在0.357左右,吞吐率平均提高了8.44%,碰撞概率平均降低了6.3%。所以,阅读器系统有效提高了单位时间内标签读取的准确性、读取速度、识别率,降低了标签相互碰撞的概率。     

Recent developments and applications of screen-printed electrodes in environmental assays—A review

Screen-printed electrodes (SPEs), which are used as economical electrochemical substrates, have gone through significant improvements over the past few decades with respect to both their format and their printing materials. Because of their advantageous material properties, such as disposability, simplicity, and rapid responses, SPEs have been successfully utilised for the rapid in situ analysis of environmental pollutants. This critical review describes the basic fabrication principles, the configuration designs of SPEs and the hybrid analytical techniques based on SPEs. We mainly overview the electrochemical applications of SPEs in environmental analysis over the past 3 years, including the determination of organic compounds, heavy metals and gas pollutants.     

亚稳态SO(c1Σ－,v’=0)的猝灭动力学

在流动余辉装置上, 研究了SO(c¹Σ^－)的猝灭动力学过程. 获得了SO₂, O₂, CO₂, N₂, He, CS₂, CH₃OH, C₂H₅OH, C₃H₇OH, C₄H₉OH, CH₃COCH₃, C₆H₆, CH₂Cl₂, CH₂Br₂, CHCl₃, CCl₄等16种分子与SO(c¹Σ^－)发生猝灭反应的速率常数. 初步分析表明: 醇类分子C_nH_2n+1OH(n=1, 2, 3, 4)中的C—H键的数目与其对SO(c¹Σ^－)的猝灭速率成正比; CO₂, N₂等非极性无机小分子对SO(c¹Σ^－)的猝灭作用不明显, 强极性分子SO₂对SO(c¹Σ^－)的猝灭作用较强. 卤代烷烃中的卤素原子的大小对SO(c¹Σ^－)的猝灭过程发挥着较重要的作用; 而氯代烷烃中氯原子的个数与猝灭速率之间的关系不明显.     

A novel intramolecular Ugi 3CC for the synthesis of N-alkyl-3-oxo-2-aryl-1,2,3,4-tetrahydropyrazino[1,2-a]indole-1-carboxamides

An intramolecular Ugi reaction of 2-(2-formyl-1H-indol-1-yl)acetic acid with aryl amines and isocyanides has been developed to produce a novel class of N-alkyl-3-oxo-2-aryl-1,2,3,4-tetrahydropyrazino[1,2-a]indole-1-carboxamides in good yields. This is the first report on intramolecular Ugi three component reaction of 2-(2-formyl-1H-indol-1-yl)acetic acid, aryl amine, and isonitrile.     

宽测温范围高温节点CC2530的开发

底层代码开源的CC2530节点芯片,在煤田火区无线传感器监测大规模组网中更具优势。针对CC2530节点不具有SPI接口的情况,利用USART接口引脚模拟了SPI接口,采用32位MAX31855与K型热电偶的模数转换,通过编写时钟片选、数据传输、时序及主从引脚配置的控制软件,开发了测温范围-40℃～1000℃的高温CC2530无线传感器网络节点。火焰、沸水、冰块的温度测试实验表明,编写的控制软件正确地转换和处理了热电偶的模拟电压量,模拟SPI口稳定地传输数据,为宽范围的温度监测需求提供可选项。     

Planar graphs without 3-cycles adjacent to cycles of length 3 or 5 are (3,1)-colorable

Given a nonnegative integer $d$ and a positive integer $k$, a graph $G$ is said to be $(k,d)$-colorable if the vertices of $G$ can be colored with $k$ colors such that every vertex has at most $d$ neighbors receiving the same color as itself. Let $?$ be the family of planar graphs without $3$-cycles adjacent to cycles of length 3 or 5. This paper proves that everyone in $?$ is $(3,1)$-colorable. This is the best possible in the sense that there are members in $?$ which are not $(3,0)$-colorable.     

一种链式无线路由协议的液压支架压力监测系统设计

本文研究并设计了一种基于无线传感器网络的液压支架压力信息采集节点,并以此为基础搭建了监测系统平台。首先对无线网络拓扑结构分析,以提高网络整体生命周期为目的,设计了一种链式结构的简单无线路由协议。在此基础上,以CC2530为主处理器完成压力采集节点软、硬件设计。最后,给出了系统采集到的液压支架工作阻力数据。测试结果表明,系统能够实现液压支架压力实时监测功能,满足应用需求。     

Development of YBCO power devices in Japan

A new Japanese national project, called M-PACC, to develop high temperature superconducting electric power devices started in June last year (FY2008–FY2012). This project aims to develop three different types of electric power devices that are expected to provide stable power supplies with large capacity and small size by using YBCO coated conductors. The first program is the development of a 2 GJ class superconducting magnetic energy storage system to control stable electric power systems. It is planned to develop several sets of element coils for a 20 MJ class system as a technological feasibility study for a 2 GJ class coil. The second program is the development of two different types of power cables with higher performance than existing power cables; one is a three-core 66 kV–5 kA class large current cable and the other is a single-phase 275 kV–3 kA class high voltage cable. These cable were required several technological developments, namely, large current and low AC loss, high voltage insulation and low dielectric loss, and power and heat balance for both cables. The third program is the development of a 20 MVA class power transformer with 66 kV/6.9 kV as a distribution transformer. In this project, power transformer systematization technology including 2 kA class large current coil technology, anti short-circuit wire winding technology, AC loss reduction technology, and winding technology will be developed.     

海绵Spongia sp.化学成分的研究（Ⅰ）

应用气相色谱－质谱联用技术从海绵Spongia sp. 中分离鉴定出4个化学成分： 1－氯－2,2－二对氯苯基乙烯(DDMU,Ⅰ)、 1,1－二氯－2,2－二对氯苯基乙烯(DDE,Ⅱ)、 1,1－二氯－2,2－二对氯苯乙烷(DDD, Ⅲ)和角鲨烯（Ⅳ）。前3个化合物是首次从Spongia属海绵中分离得到。     

基于CC1100+MSD209的网络液晶电视方案

介绍了一个基于C2 Microsystems公司的CC1100 芯片的网络功能实现模块,搭配一个电视前端芯片即可实现完整的网络电视方案.