双频RFID系统在采矿业上的应用

RFID在矿山中承担着挽救生命的重任,本文以南非的Paardekraal矿为例介绍了如何使用RFID技术实现救助和保护矿工的生命。这对于矿难频发的的我国矿业生产有极为重要的实际意义。     

超高频RFID标签数字电路的低功耗设计

无源标签的识别距离主要与功耗有关,因此降低标签的功耗成为设计者重点关注的目标。采用门控时钟、算法优化、行波计数器、低阈值电压以及功耗管理单元等低功耗技术,对基于ISO/IEC 18000-6C标准协议的超高频RFID标签芯片的数字电路进行功耗优化。仿真结果显示,在1.8 V工作电压下,电路功耗为12.3 μW,与优化前电路相比,功耗优化率达43.6%,有效降低了标签数字电路的功耗。     

A compact low-power UHF RFID tag

In this paper, the design of an ultra-low-power UHF RFID tag is introduced. The system architecture and the communication protocols are chosen to operate with the minimum requirements possible from the RFID tag. By moving most of system functionality to the RFID reader side, the circuit requirements of the RFID tag circuits are relaxed. Supply voltages for both analog and digital parts are chosen carefully for minimum power consumption. The RFID tag is designed in standard digital 0.13 μm CMOS technology. Simulations results of the main blocks are shown. The power consumption of the chip is only 1 μW, and the chip area is only 0.14 mm×0.23 mm.     

密集布放环境下的标签互阻设计方法

在密集布放环境中,超高频射频识别标签(UHF RFID)会受到相邻标签的干扰产生互阻抗,导致读取率下降。基于二端口网络和八木阵列天线的理论,该文分析天线结构与互阻抗的关系,并解释标签天线传输系数和增益的变化原因。进而提出一种密集布放环境中的标签互阻设计方法。仿真和测试结果表明,新标签不仅单一性能良好,且互相间的干扰小,适用于多标签密集布放环境中的射频识别系统。     

The 4-tert-butylphenyl group as a simple tag for solution phase synthesis

A solution phase synthesis strategy was investigated using 4-tert-butylphenyl group as the tag and a beta-cyclodextrin column as the affinity chromatographic support for the isolation of compounds containing the tag. It was found that compounds containing the tag have significantly longer retention times on the beta-cyclodextrin column than those compounds that do not have such a tag. The tag is chemically inert and can be introduced onto and removed from target compounds readily. This solution phase synthesis method was applied to the synthesis of some simple amino acid derivatives.     

Intrusion Detection Methods Based on Incomplete RFID Traces

According to the Radio frequency identifi-cation (RFID) tag cloning attack problems of RFID system and the existing problems of intrusion detection research based on incomplete RFID traces, this paper proposes a method of intrusion detection by combining the Markov chain technology and probability statistics technology. We use this method to calculate the threshold that is used to determine whether the tag event is a cloning tag intrusion one. Current research focuses on RFID intrusion detec-tion under the condition of complete RFID traces, such as encryption algorithm improvement, tag authentication protocol improvement, and track and trace technology in RFID supply chain. RFID traces are occasionally to be incomplete, which causes the above methods to be ineffi -cient. Our method proposed in this paper is the solution to incomplete RFID traces which makes up for the study of RFID intrusion detection research.     

SAW射频识别系统中无源标签的小型化设计

SAW RFID已被广泛认定为第二代RFID技术。但是,由于受标签尺寸的限制,声表面波标签还不能应用于零售等小物品的识别上。为了减小声表面波标签的整体尺寸,本文仿真模拟了压电基底为不同晶体以及相同晶体不同切向时声表面波的性质,为选择高频率稳定性和高能量转换效率的基底材料提供了依据。高的频率稳定性和能量转换效率,可以使声表面波标签具有更加紧凑的结构,进而减小压电基片的尺寸。设计了一款小型化贴片天线,测量验证了这款小型化天线完全满足声表面波射频识别的需要。     

全球品牌标签领导者——艾利丹尼森RFID标签应用案例介绍

艾利丹尼森打印系统部是全球最大的条码打印机和RFID标签生产商之一,一直引领条码应用科技。本文介绍了艾利丹尼森公司RFID应用的一些案例。     

荧光原位杂交技术在活性污泥菌群识别中的研究进展

荧光原位杂交技术(FISH)广泛地应用于分析环境微生物的群落组成,能够同时对微生物进行定性、定量分析,并确定微生物群落空间分布情况.本文阐述了FISH法应用于活性污泥处理系统的重要作用,综述了FISH法在活性污泥及生物膜微生物菌群的组成、结构与功能的研究和应用,同时讨论了其在应用中存在的不足,并在此基础上总结了一系列可...