Designing Wireless Charger Circuit for Hearing Aids Using Radio Frequency Waves

In this paper, an attempt has been made to produce a recipient system of wireless charge for a simple hearing aid so that electrical signal would be generated through detecting and receiving radio frequency waves (RF). The purpose of this design is to receive wireless charge for hearing aids and basically for any electronic device which is not required to a high energy for being setup. In this study, it has been demonstrated that as the amount of radio receiving energy increases, distance of receiver from antenna should be decreased;otherwise, either maximum amount of the receiving energy, or signal power density of the transmitter should be increased. Since it is impossible to be performed, it is decided to set up an energy receiving system constructed by rectenna and charge Circuit and to adjust their parameters to provide energy requirements for a device with low-power consumption. In this paper, different components of an energy receiving system from radio frequency band have been mentioned and a diagram block has been suggested. Subsequently, input impedance of designed antenna has been adjusted by provided relations. This impedance should be adjusted with the total impedance of regarded hearing aid Circuit by which the highest amount of received signal power is transferred to the battery of hearing aids. Received signal is converted to a dc voltage by rectifier diode. Finally, by applying a voltage regulator which has been designed using a common-collector amplifier not only the output voltage is kept constant, but the power is also strengthened. The battery of the hearing aids will be charged using the obtained power and voltage.

射电宁静天空保护进展

射电天文业务(radio astronomy service,RAS)通过探测来自宇宙的无线电信号开展天文研究。由于射电望远镜的高灵敏度,极易受到来自望远镜本身的电磁辐射,及移动通信业务和卫星业务等主动无线电业务射频干扰(radio frequency interference,RFI)的影响,因此保护射电宁静天空是支撑射电天文观测研究取得科学成果的重要基础。近期,国内射电天文设施发展迅速,如500 m口径球面射电望远镜(Five-hundred-meter Aperture Spherical radio Telescope,FAST)已取得众多突出成果,新疆奇台110 m射电望远镜正在建设等。与此同时,主动无线电业务的快速增加,导致国内射电望远镜无线电环境逐渐恶化。为保护RAS所需的射电宁静天空,国内开展了相关的技术研究,并采取了频谱管理措施,如射电望远镜电磁兼容(electromagnetic compatibility,EMC)技术研发、评估RAS与主动无线电业务的兼容性、在射电望远镜周边设立电磁波宁静区(radio quiet zone,RQZ)、参与国际与国内频谱管理协调等,本文进行了总结陈述。这些工作,有效地保护了国内射电望远镜周边的电磁环境。

Web Services在RFID系统中的应用综述

概述了RFID(射频识别)和W eb Services技术,对W eb Services在RFID中的应用进行了较详尽的阐述和分析,并对其中的研究难点和发展趋势作了较详细的分析。

基于调节干扰源频段的射频干扰软件解决方法

基于屏蔽材料和滤波器等硬件的射频干扰解决方法仅能在一定程度上减弱干扰,很难完全消除干扰信号。提出一种使用软件程序主动控制干扰源工作状态的方法,使干扰信号频率发生偏移,避免对有效信号产生干扰。首先,分析元器件的干扰因素,研究干扰源工作状态与干扰信号频率的联系。然后,通过计算和实验找出调节干扰源工作状态的方法,使干扰信号频率偏移到无干扰的频段。最后,设计一套具备自适应调节功能的软件程序并运行,以笔记本电脑的显存和Wi-Fi为实验对象,实时监控和调节两者的状态。实验结果表明,此方案可以有效解决笔记本电脑主板上显存与Wi-Fi间的射频干扰问题。

探讨智能借还书系统中无线射频识别技术的应用

无线射频识别(Radio Frequency Identification,RFID)技术和传统条码技术相比拥有突出的应用优势,能够改善图书馆整体服务质量。凭借其技术优势,RFID技术广泛应用于图书馆借还书系统当中,提高了馆内图书管理效率和服务质量。首先分析了无线射频识别技术以及应用优势,随后介绍了无线射频识别技术下智能借还书系统的需求、设计以及实现,希望能给相关人士提供有效参考。

冷库轨迹光寻货及库位温差管控系统研究

在冷链产业快速发展、冷库运营数字化转型升级过程中,普遍缺少对库内库外的货物信息监控、管理和数据交互,冷库业务各阶段状态管理不足、信息模糊缺失,冷库运营效率低、能耗大。本文根据冷库行业的经营特点和管理模式,结合冷库管理与信息技术有机融合的发展趋势,系统阐述了一种冷库业务管控系统优化方案,针对性解决冷库业务数据模糊、能耗管控弱、货物寻找便捷性差等问题,旨在提升冷库作业全流程管理效率和冷库管理的自动化、智能化水平。

Regulation and Control of Electromagnetic Field in Radio-Frequency Circuits and Systems

Since the first demonstrations of radio-frequency(RF)circuits,the physics of the electromagnetic(EM)field and its regulation and control with codesigned circuits,have become essential competencies of RF circuit designers.Leveraging advanced regulation or control methods,numerous high-performance circuits have been developed at RF and millimeter-wave(mm-wave)frequencies.Three main methods of electromagnetic regulation have been widely utilized,namely,the separation of electric and magnetic coupling paths,the manipulation of electromagnetic energy through the coupling of multiple tanks or multiple resonators,and the regulation of electromagnetic fields in air cavities or meta-substrates.The separated coupling paths of electric and magnetic fields provide guidance for designing a high-performance filter topology with a quasielliptical response through additional zeros.The manipulation of the EM field through electrical and magnetic intercouplings of multitanks or multiresonators,such as are used in oscillators,power amplifiers(PAs),etc.,results in remarkable power efficiency,size reduction,and wide bandwidth.The regulation of electromagnetism through an air cavity,patterned substrate,or metasubstrate reduces dielectric losses and size,especially when using a substrate integrated suspended line(SISL)platform.Many excellent circuits have been reported based on SISL with low loss,high integration,and self-packaging.Here,we present state-of-the-art cases that demonstrate the benefits of EM field regulation and control.

SOA-based RFID public services infrastructure:architecture and its core services

Radio frequency identification （RFID） has prominent advantages compared with other autoidentification technologies. Combining RFID with network technology, physical object tracking and information sharing can possibly be carried out in an innovative way. Regarding open-loop RFID applications, RFID public services infrastructure （PSI） is presented, PSI architecture is designed, and service modules are implemented, and a demonstrative application system, blood management and traceability system, is studied to verify PSI. Experimental results show the feasibility of the proposed architecture and the usability of PSI framework software.

Prototype for Integrating Internet of Things and Emergency Service in an IP Multimedia Subsystem for Wireless Body Area Networks

In recent years, the application of the Internet of Things （IoT） has become an emerging business. The most important concept of next-generation network for providing a common global IT platform is combining seamless networks and networked things, objects or sensors. Also, wireless body area networks （WBANs） are becoming mature with the widespread usage of the IoT. In order to support WBAN, the platform, scenario and emergency service are necessary due to the sensors in WBAN being related to wearer＆#39;s life. The sensors on the body detect a lot of information about bioinformatics and medical signals, such as heartbeat and blood. Thus, the integration of IoT and network communication in daily life is important. However, there is not only a lack of common fabric for integrating IoT with current Internet and but also no emergency call process in the current network communication envi-ronment. To overcome such situations, the prototype of integrating IoT and emergency call process is discussed. A simulated boot-strap platform to provide the discussion of open challenges and solutions for deploying IoT in Internet and the emergency commu-nication system are analyzed by using a service of 3GPP IP multimedia subsystem. Finally, the prototype for supporting WBAN with emergence service is also addressed and the performance results are useful to service providers and network operators that they can estimate their migration to IoT by referring to this experience and experiment results. Furthermore, the queuing model used to achieve the performance of emergency service in IMS and the delay time of the proposed model is analyzed.

Multi-Frequency Interference Detection and Mitigation Using Multiple Adaptive IIR Notch Filter with Lattice Structure

Radio Frequency Interferences (RFI), such as strong Continuous Wave Interferences (CWI), can influence the Quality of Service (QoS) of communications, increasing the Bit Error Rate (BER) and decreasing the Signal-to-Noise Ratio (SNR) in any wireless transmission, including in a Digital Video Broadcasting (DVB-S2) receiver. Therefore, this paper presents an algorithm for detecting and mitigating a Multi-tone Continuous Wave Interference (MCWI) using a Multiple Adaptive Notch Filter (MANF), based on the lattice form structure. The Adaptive Notch Filter (ANF) is constructed using the second-order IIR NF. The approach consists in developing a robust low-complexity algorithm for removing unknown MCWI. The MANF model is a multistage model, with each stage consisting of two ANFs: the adaptive IIR notch filter Hl(z) and the adaptive IIR notch filter HN(z), which can detect and mitigate CWI. In this model, the ANF is used for estimating the Jamming-to-Signal Ratio (JSR) and the frequency of the interference (w(0)) by using an LMS-based algorithm. The depth of the notch is then adjusted based on the estimation of the JSR. In contrast, the ANF HN(z) is used to mitigate the CW interference. Simulation results show that the proposed ANF is an effective method for eliminating/reducing the effects of MCWI, and yields better system performance than full suppression (kN=1) for low JSR values, and mostly the same performance for high JSR values. Moreover, the proposed can detect low and high JSR and track hopping frequency interference and provides better Bit error ratio (BER) performance compared to the case without an IIR notch filter.

基于RFID技术的图书馆自助服务系统设计

设计一种基于射频识别(Radio Frequency Identification,RFID)技术的图书馆自助服务系统,以提高图书馆的运作效率和用户体验,实现图书借阅、归还和定位等功能的自动化处理。采用RFID技术作为核心技术,通过将RFID标签粘贴在每本图书上,并在图书馆各个关键位置安装RFID读写器,实现对图书的无线识别和追踪。经过实际测试和数据分析得出,基于RFID技术的图书馆自助服务系统能够大幅提升图书馆的运作效率和用户体验,自助借阅和归还的速度更快,减少了等待时间。

陆基无线电授时系统信号分析与解算

时间应用的广泛性以及授时战的提出,使国家更加重视授时服务体系的完备性以及灵活性。为顺应授时战要求,从我国整体授时体系出发,简单介绍授时系统的工作原理,从多方面对比各类授时系统;主要分析了我国陆基无线电授时系统的发播程序以及信号格式等,对BPM短波呼号以及时码结构进行补充与修正,并讲解对陆基无线电授时信号的解算过程,利用实际试验验证解算方法的可行性;最后根据我国目前授时体系的现状以及授时战的要求,给出应对授时战的技术路线,对未来我国授时体系发展方向提出建议。

短波授时信号的无线电规则浅析

标准频率和时间信号业务是国际电信联盟规定的无线电通信科学服务业务之一,受到《无线电规则》的管控和指导,以避免出现时间不统一和干扰情况。对与标准频率和时间信号播发相关的无线电规则进行解析,是标准频率和时间信号播发全球化的保证。通过对频率划分、时间的全球统一、标准时间体系、闰秒(跳秒)、[UTC]报告书的起草情况等主要国际规则的研究,为我国标准频率和时间信号播发的国际地位的提升以及科学研究、播发、接收使用监测工作有重要意义。

一款一体化氩气高频手术设备的设计

氩气高频手术设备具备电切、电凝及氩气束凝功能,在临床中应用广泛。该研究采用分模块设计原理实现微控制器模块、高压控制模块、高压输出模块、射频放大器模块、漏电控制模块、射频输出控制模块及其他辅助模块,对氩气高频手术设备进行优化设计,利用示波器、旋转电位器、万用表,测量氩气高频手术设备在固定阻值时不同工作模式下设定功率信号对应的输出电压值,并分析系统调节电压与设定功率信号的比例关系。该设备功能具有独立功率系统,各工作模式下,输入电压和对应的设定功率信号之间均存在比例关系,并实现了氩气高频手术设备一体化优化设计,为设备安全使用及维护提供有效途径。

Toward an SCA-OSGi based Middleware for Radio Frequency Identification Applications

The radio frequency identification (RFID) technology progressing is becoming a increasing interest in several application areas. To accommodate diverse and changing requirements from applications,RFID middleware should be reconfigurable. However,current RFID middleware is limited in its ability to support reconfiguration. To solve this problem,we adopt the service-oriented component-based approach in building the middleware. Component-based design enables decomposition of middleware functionality and is easier than the current one to manage and modify the structure of the middleware both statically and dynamically. Applying service-oriented architecture (SOA) can further reduce the coupling between components and external software and ease the integration between middleware and applications. We propose a two-layered service component architecture (SCA) open service gateway initiative (OSGi) component model so as to enable reconfigurability. Based on the proposed component model,we build a standard-based RFID middleware-SCA-OSGi based RFID middleware (SORM) which supports flexible deployment topologies and reconfigurability. The design and implementation details of SORM are illustrated.

基于SOA的物联网应用基础框架

为有效整合企业的各类服务、降低重复工作的损耗,提出基于面向服务架构(SOA)的物联网企业应用基础框架,将原有SOA的3层结构细分为6层,定义各层功能,给出.Net平台和Java平台2种实现技术。该框架利用射频标识构建的物联网对企业产品全流程进行监控,通过SOA实现海量数据资源共享和高效利用,为企业资源整合提供一种可行的解决方案。

供应链环境下一种分布式RFID发现服务

本文针对大规模RFID应用和企业对其EPCIS进行完全的访问控制的需求,对EPCIS事件重新建模使之能够描述供应链活动所产生的绝大部分事件,并提出一种新的分布式RFID发现服务.这种发现服务基于“跟踪供应链”模式,利用编码解析服务（ONS）,在发起查询时采用多个查询流以提高查询效率,在返回结果时并行地直接返回给客户端以缩减路由跳数.实验表明这种分布式RFID发现服务具有较高的效率和可用性.

射频识别在物品跟踪与追溯系统中的应用

针对供应链全过程的物品跟踪和追溯需求,提出了基于射频识别语义事件的物品跟踪模型和追溯方法;定义了五种射频识别业务事件,使用可扩展标记语言元素描述产品物流信息。通过缓存优先级排队策略处理并发射频识别复杂事件,实现了射频识别事件与业务单据的自动匹配和集成。设计了物品跟踪与追溯系统的功能架构、网络结构和安全体系,通过Web Service和手机短信等多种方式查询追溯信息。将基于射频识别的跟踪与追溯方法应用于大型酒厂的综合管理,可以有效实现高档酒防伪、经销商防窜货管理和库存管理。

基于SOA的RFID中间件集成应用

RFID中间件的出现有助于实现RFID设备与企业应用系统之间的集成。该文提出一种基于面向服务体系架构的RFID集成应用方案,使企业应用系统能够通过服务接口层调用RFID中间件提供的服务,实现应用系统与RFID系统的松耦合集成。应用实例验证了该项方案的可行性。

基于物联网的智能厂站位置服务系统

根据目前变电站、电厂传统巡检方式存在的弊端,提出了一种可以实时定位人员位置,并根据不同位置提供多种服务的解决方案。比较了国内外多种定位系统,并总结了基于无源超高频电子标签定位的优势。系统根据物联网网络层次划分为感知层、网络层、应用层3层,分别阐述了感知层无源超高频电子标签的安置方案,网络层手持终端预处理感知对象数据,完成本地服务并将人员空间位置信息实时通过无线网络传递到应用层位置服务器,可以与厂站监控系统、智能变电站全景数据平台之间实现数据共享和智能联动。系统已实际应用于500kV智能变电站低压开关柜室和水电站廊道中,显著提高了人身安全性和厂站自动化水平。