RFID无线射频技术在图书馆的应用分析

阐述了RFID无线射频技术的工作原理,以及RFID无线射频技术在图书馆的应用及意义,RFID无线射频识别技术使图书的借还、自助借阅、防盗、盘点、检索、整理书架、自动分拣均通过电子标签完成。真正实现了自助借阅的快捷方便,防盗系统的可靠准确和盘点、找书、整理书架的快速。对无线射频识别技术与条形码技术进行了比较,分析了几种不同频段的RFID技术在图书馆应用中的优缺点,介绍了超高频RFID无线射频技术在少年儿童图书馆的实际应用。     

基于STC89C58RD-I-芯片的无线多点温度采集系统设计

用新一代STC89C58RD＋单片机、射频芯片nRF401和单总线数字温度传感器DS18820构建无线多点温度采集系统。该系统硬件电路简单,响应速度快,性能稳定,无线通讯距离可达500—800m。     

物联网在现代农业中的应用

近几年来物联网技术受到社会的广泛关注。本文介绍了物联网的起源、概念、历史与国内外发展现状;阐述了基于RFID和传感网络的物联网应用架构在农业现场中的应用情况,分析了物联网在应用中存在的问题;最后展望了物联网技术在农业上的应用前景以及物联网技术对人类生产生活、科技进步、工业发展的促进作用。     

公路不停车收费系统的研究与开发

不停车收费系统及其网络化是我国公路收费运营管理方式的发展方向。本文介绍了一种公路不停车收费系统的开发和网络系统的结构设计。采用射频识别技术获取车辆信息,运用V isual Basic 6.0和M icrosoft SQL Server 2000开发系统的主要功能模块构建系统的网络体系结构,实现系统数据的共享与传输。对系统的主要模块功能、特点进行了分析阐述。     

高频真空干燥木材的研究

以我国东北主要树种兴安落叶松(Larix gmelini Rupr)和水曲柳(Fraxinus mandshurica Rupr)板材为试材,并分别选取具有代表性的25mm和50mm两种厚度,对高频真空干燥木材技术进行了研究,结果表明:高频真空干燥适合于透气性好的难干阔叶材,尤其是厚板。通过对干燥条件的调节可以有效地控制材温和真空度,实现高质量的快速干燥。     

人工林杨木的高频真空干燥工艺

在人工林杨木的高频真空干燥系列试验中,通过不断改变干燥工艺参数并分析总结试验结果,从而确定杨木高频真空干燥适宜的工艺基准。结果表明,在本试验确定的高频真空干燥工艺下,初含水率较高的杨木不仅能保证干燥质量,而且干燥速度可比常规蒸汽干燥法和高温蒸汽干燥法提高数倍。     

Efficacy of radio frequency treatment and its potential for control of sapstain and wood decay fungi on red oak,poplar, and southern yellow pine wood species

The effectiveness of radio frequency (RF) treatment in the control of wood decay fungi (Gloeophyllum trabeum, Ganoderma lucidum, and Irpex lacteus) and sapstain fungus (Ceratocystis fimbriata) in red oak (Quercus spp.), poplar (Populus alba), and southern yellow pine (Pinus spp.) was evaluated in the laboratory as an alternative to methyl bromide (MB) treatment. Wood samples (15.5 x 10 x 10 cm) were inoculated with fungi from a 7-day culture by dipping them to a depth of one face deep (2 cm) into inoculum and incubating them at 25°C for 14 days. Identical wood samples were left uninoculated as controls. Subsequent to incubation, the wood blocks were exposed to RF radiation in an industrial 40-kW dielectric oven at temperatures between 60° and 70°C for 2 min. The test fungi were recovered and reisolated from all of the control wood blocks but not from RF-treated wood blocks. RF treatment resulted in complete inhibition of the fungus in 98%-100% of the wood samples. Moisture content loss (≥1%) was noted after wood had been exposed to RF treatment. Moisture content may be an important factor to consider with RF treatments. RF treatment can, therefore, potentially provide an effective and rapid quarantine treatment as an alternative to MB fumigation for certain pathogen-wood combinations. This article reports the results of research only. Mention of a product does not constitute an endorsement or recommendation by USDA for its use.     

基于射频技术的食品安全信息追溯

基于射频识别技术(RFID)设计食品安全信息追溯系统,采用低功耗型单片机C8051F310作为控制器,射频专用收发芯片CRX14在单片机的控制下实现对作用域内的射频标签进行读写操作,从而获取食品的相关信息.通过采集食品加工、生产和流通的各阶段的信息,建立起完善的追溯制度,达到检测食品安全的目的.     

Development of thermal treatment protocol for disinfesting chestnuts using radio frequency energy

Methyl bromide fumigation, widely used for disinfesting chestnuts, will be banned in developing countries by 2015 under Montreal Protocol due to its adverse effects on human health and environment. The purpose of this research was to study possible applications of radio frequency (RF) heating for disinfestations of chestnuts to replace chemical fumigation. A 6 kW, 27 MHz free-running oscillator RF system was used to determine the effect of a developed RF treatment protocol on quality of chestnuts. The results showed that the heating time needed only 5.4 min to heat the 2.5 kg chestnuts from 20 °C to 55 °C using RF energy, and 170 min for chestnuts to reach 52.5 °C using hot air at 55 °C and 1.6 m/s. Based on the heating uniformity studies, a RF treatment protocol was finally developed to combine 0.6 kW RF powers with a forced hot air at 55 °C, movement of the conveyor, mixing twice, and holding at 55 °C hot air for 5 min, followed by forced room air cooling through single-layer samples. Quality of chestnuts was not affected by the RF treatments because no significant differences in moisture, protein, fat, soluble sugar, firmness, and color were observed between RF treatments and untreated controls after 8 days at 35 °C, simulating one year of storage at 4 °C. The RF treatments may provide a rapid and environmentally friendly method to replace chemical fumigation for disinfesting chestnuts.     

物联网在豫南地区智能农业中的应用研究

结合豫南地区农业发展现状,介绍农业物联网的应用,并提出具体解决方案,以推动物联网在豫南地区智能农业中的应用。