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关键词： 微带天线   矩形贴片   E形贴片   UHF RFID   读卡器天线  

摘要： 针对矩形贴片微带天线带宽窄的问题,提出了一种采用E形贴片微带天线展宽技术设计制作的UHF RFID读卡器天线。首先介绍了目前展宽矩形贴片微带天线工作带宽的三种基本方法,并从理论上分析了矩形贴片微带天线的计算过程,然后通过HFSS仿真工具,分别设计了工作于840~845 MHz频段的矩形贴片微带天线和E形贴片微带天线,最后用薄铜板手工制作了E形贴片微带天线实物并进行测试,实验结果表明其将微带天线的相对带宽从0.3%提高到11%,达到了宽带读卡器天线的要求,同时天线增益也提高了2.3 dB。

关键词： Java编程语言   医疗设备   物联网   移动应用   运维管理   精细化管理   RFID   智能化管理平台  

摘要： 目的 :为加强医疗设备的精细化管理,提高设备利用率,充分发挥设备效益,从而更好地服务临床。方法 :基于B/S架构,采用Java编程语言开发,融合物联网、RFID、移动应用等技术构建医疗设备精细化、智能化管理平台。结果 :优化医疗设备采购、审批、报修、运维、质控等流程,改进设备的运维管理、巡检管理、报修管理等方式,完善医疗设备的管理模式。结论 :通过该平台节约人力成本,降低设备故障率,提高设备使用率,提升设备运行可靠性,有效地提高医疗设备管理的精细化、智能化程度。

关键词： 垃圾分类   RFID   组态屏   STC8A8K64S4单片机   485总线  

摘要： 针对当前垃圾分类知识普及推广形式单一、效果不佳的问题,设计了一种基于RFID和组态屏的垃圾分类学习系统。该系统采用STC8A8K64S4A12单片机为主控芯片,采用RFID技术识别垃圾卡片上的RFID信息,4路RFID识别电路通过485总线与主控芯片进行通信,系统采用迪文组态屏为操作和显示的终端设备,采用MX6200语音模块进行语音互动,另外系统还具备Wi-Fi联网功能,可将测试数据上传到物联网平台进行垃圾分类成绩的统计和分析。该系统具有操作便捷、交互性好、趣味性强等优点,可满足垃圾分类知识的普及和推广需求。

关键词： RFID   印制电子   柔版印刷   UV固化油墨   化学沉积  

摘要： 聚对苯二甲酸乙二醇酯(PET)具有优良的物理化学性能,其耐弯折性好、应用成本低廉,是柔性电子产品的重要目标基材之一,但其同时存在表面能低、粗糙度小、表面难以金属化且金属层与基材的附着力不佳的问题。提出了一种可靠且低成本的PET基射频识别(Radio Frequency Identification,RFID)标签天线的卷对卷柔版印刷制备工艺。该技术以PET作为RFID标签天线的基材,以柔版印刷作为印刷技术,通过紫外固化技术对印制天线图案进行固化干燥,并采用化学沉积法制备RFID标签天线的金属层,具有工业化生产前景。通过扫描电子显微镜、X射线衍射与附着力测试证明了基材表面的金属层具有致密、结晶度高、附着力良好的优点,所得天线的电阻率低(2.98μΩ·cm)且机械性能良好(4000次弯曲)。

关键词： 区块链技术   农产品   茶叶溯源系统   RFID技术  

摘要： 针对塔畈乡茶园茶品质下降、茶叶粗制滥造难辨真伪、茶叶原料不过关等问题,搭建基于区块链技术的塔畈乡茶叶溯源系统,对茶叶种植、茶叶采摘、茶叶加工、茶叶包装等各个环节进行监管并对收集到的数据进行分析整理,以期解决茶园存在的相关问题。研究表明,塔畈乡茶叶溯源系统对茶叶生产全过程的追踪可提高茶叶的品质、品牌影响力和茶业企业的竞争能力,并且此系统在种植环境监测、溯源信息可视化、溯源结果可视化等方面具有较强的优势,能够为茶叶品质优化及茶叶大数据分析提供技术支持,同时为建立茶叶生产优化模型和特色农产品质量安全示范平台奠定基础。

关键词： RFID system   UHF frequency band   read range   localization  

摘要： This paper proposes a small-size UHF RFID tag antenna, which was designed to function in the frequency interval of 860-960 MHz, with a large-read range of up to 17 m. In this work, the effects of capacitive slots and gaps on the impedance matching between conventional industrial chips and a designed RFID antenna was investigated. Simulated and measured results provided a clear indication that these two techniques can efficiently improve the return loss parameter and the antenna impedance matching behavior at the UHF band. Three-dimensional electromagnetic (EM) simulations results further proved that a better impedance matching between an industrial chip and a proposed RFID antenna occurs at 870 MHz, where the estimated input antenna impedance was about Za = 16 + j184 (& OHM;), and the calculated read range reached a value of up to 17 m with a measured return loss value of -14 dB. The proposed RFID antenna can almost maintain the same read range value over a 180 degree angle variations on the horizontal plane owing to its omnidirectional radiation pattern. The fabrication and test stages of the antenna prototype were scheduled to validate the simulated characteristics. Experimental results confirmed the performances of our proposed RFID tag antenna and proved its potential ability for localization applications. EM simulations have been performed using the well-known commercial EM software simulator CST MWS.

关键词： Japanese tit   nest site characteristics   nest site selection   nest visiting   RFID  

摘要： Selecting a suitable nest site is critical to the survival and reproduction of birds. Prospecting allows individuals to gather information on the local quality of potential future breeding sites, which may help them make the best nest site selection decision. However, few studies have focused on the direct links between the prospecting activity of breeders and subsequent nest site selection. In this study, we investigated the prospecting pattern of Japanese tits Parus minor during the pre-breeding period of the first breeding attempt and whether nest site characteristics influence their nest box visiting behaviour and occupied nest site. We used radio frequency identification (RFID) to track the movements of Japanese tits visiting nest boxes and compared nest site characteristics between visited and unvisited (control) nest boxes, as well as between visited and occupied nest boxes. We found that Japanese tits started visiting nest boxes approximately 20 days before breeding, visited an average of six nest boxes and eventually chose the most visited nest box for breeding activities. Japanese tits were more likely to visit nest boxes that had less canopy cover and lower shrub density but a greater total number of surrounding trees and ultimately chose breeding nest boxes with a smaller entrance inclination, in nesting trees with a larger diameter at breast height (DBH) which were surrounded by trees with a larger DBH. Our results suggest that Japanese tits visit several potential breeding sites before choosing breeding nest boxes and that nest site characteristics can influence their prospecting activity and nest site selection.

关键词： RFID   Security   Privacy   PUFs  

摘要： Radio Frequency Identification (RFID) technology is commonly used for tracking and identifying objects. However, this technology poses serious security and privacy concerns for individuals carrying the tags. To address these issues, various security protocols have been proposed. Unfortunately, many of these solutions suffer from scalability problems, requiring the back-end server to work linearly in the number of tags for a single tag identification. Some protocols offer O(1) or O(log n) identification complexity but are still susceptible to serious attacks. Few protocols consider attacks on the reader-side. Our proposed RFID authentication protocol eliminates the need for a search in the back-end and leverages Physically Unclonable Functions (PUFs) to securely store tag secrets, making it resistant to tag corruption attacks. It provides constant-time identification without sacrificing privacy and offers log2 n times better identification performance than the state-of-the-art protocol. It ensures destructive privacy for tag holders in the event of reader corruption without any conditions. Furthermore, it enables offline readers to maintain destructive privacy in case of corruption.

关键词： Temperature measurement   Fabrication   Chemical sensors   Implants   Real-time systems   Fractals   Sensors  

摘要： RFID technology has boomed in the area of biomedical applications, particularly in wearable sensors and bioimplants. The placement of the tag externally or internally generates numerous challenges, such as the design procedure, fabrication method, and real-time testing, along with unique challenges specific to diagnosis and other on-body applications. This article presents a review of bioimplants for several on-body applications associated with RFID technologies and their impact on human tissue. Several fabrication methods are also discussed, with a focus on understanding flexible, conformal, and strong RFID devices. In light of the future of upcoming applications, this article also reviews transformative RFID-based solutions for wireless body area network and implantable uses. In addition, the review highlights the design and implant of prototype devices. In sum, the main focus of this article is all aspects of chipless RFID utilized in multiple places in the human body, beginning with limb sensing and tracking, which basically involves a prosthetic structural tag (PST) responsible for providing information about a prosthetic limb in space. Similarly, the ultrahigh-frequency (UHF) passive RFID implant gives information about the tag, which is placed in the limb, and the communication between the readers takes place without any physical contact. An alternative touch probe method that resonates at about 13.56 MHz improves the accuracy of the implant. Stent tags are discussed for cardiovascular systems. Other specific topics covered are body implants based on an organically modified ceramic technology (ORMOCER) substrate, myoelectric prostheses, fractal-based RFID implants for crack sensing, and the thermal effects of implants.

关键词： RFID   Artificial light   Puffinus yelkouan  

摘要： The ecological effects from artificial light are complex and can affect species and life-stages differently. Ships are a dynamic source of light pollution, often brightly lit and temporarily increasing light levels in otherwise relatively dark areas. Because several nocturnal seabird species display reduced activity and avoidance of natural or artificial light, we expect that bright vessel lights may affect colony attendance patterns. Here, we test whether the presence of ships in front of coastal cliffs affects colony attendance in the Yelkouan Shearwater (Puffinus yelkouan). Ship presence at the site was obtained from an automatic identification system database, and a data logger measured light levels at the colony autonomously for four breeding seasons (2017-2020). Moreover, a Radio Frequency Identification (RFID) system was deployed at a cavernous colony entrance to register arrivals and departures of shearwaters. Direct illumination from ships increased cliff face brightness, and colony attendance was significantly reduced in brighter conditions. Ship presence reduced the number of shearwaters entering the colony per hour by a mean of 18% (SD +/- 24). Disruption of natural attendance patterns is likely to have short- and long-term effects on breeding success, physiological condition, and colony viability. Therefore, we propose mitigation measures to reduce the impact from commercial shipping on burrow-nesting seabirds. Local regulations are necessary for colony-specific impact reduction, while incorporation of measures such as black-out blinds, fixture shielding and maximum brightness limits into international conventions can have additional far-reaching benefits.