基于COM的HIRFL-CSR电源远程监控系统

本文介绍了兰州重离子加速器冷却储存环(HIRFL-CSR)最新改造后的电源远程监控的总体设计,包括硬件和软件方面的设计.该系统采用了COM组件实现前端服务器Oracle数据库与前端被控设备数据的交互,以及WEB服务器与中心Oracle数据库的数据交互,实现了控制人员对设备的远程监控.这样有利于对电源设备状态的实时监控,以及电源系统与各子系统的数据交互.该系统已经在现场经过测试,性能稳定.     

应用于脉冲辐射场测量的分布式无人值守测试系统

介绍了一种用于脉冲辐射场测量的分布式无人值守测试系统的开发。该测试系统采用分布式结构,通过LAN网络和光纤通讯设备进行互联。系统利用基于TCP/IP协议开发的网络程序实现了实验数据传输、备份与显示。采用服务器和工业PC计算机控制实验设备,利用VISA技术开发测试控制程序实现了对多种仪器设备的控制。通过用VNC技术实现了基于LAN的网络计算机状态监控和控制,并利用NTP技术实现了测试系统时钟同步。     

基于Web的远程电脑桌面监控系统的研究与实现

利用Java Web技术,研究并实现了一种基于Web的远程电脑桌面监控系统ISS(ImageSnapshot Server)。该系统由客户机Web浏览器和服务器两部分组成,服务器部分可分为截屏软件、Web服务器和Oracle数据库三个模块。截屏软件将监控PC机的桌面环境截取下来,上传到TomcatWeb服务器,通过网页进行实时显示,同时将桌面历史记录保存到Oracle数据库中。监控人员可通过Web浏览器,查看被监控电脑的桌面实时画面和特定时间段内的桌面历史记录,这为需要监控远程电脑桌面的用户提供了极为便利的方法。     

BSRF光束线水连锁集中监控系统

介绍了基于SCADA系统的BSRF(北京同步辐射装置)光束线水连锁集中监控系统.该系统对光束线冷却水状态进行实时监控,及时发现故障并给出报警,以保障光束线设备安全、稳定、可靠地运行.系统底层通过PLC对现场设备进行数据采集及连锁控制,系统上层采用工控组态软件-力控,实现人机界面编写、故障报警、历史数据记录和网络发布.该...     

基于MPEG4的嵌入式远程监控系统设计

介绍了一种基于MPEG4的嵌入式远程监控系统的设计方案.该方案采用硬件ASIC对视频和音频数据进行压缩,通过以太网传输视频流和音频流.系统的配置和状态也是通过以太网远程监视和控制.该方案具有系统体积小,建造成本低等优点,支持多用户连接,适用于银行、交通、教育等多种领域的监控需求.     

中国先进研究堆监控系统中保护系统OPC服务器的研究与开发

以开发OPC服务器实现驱动程序功能的方式,实现了中国先进研究堆全数字化监控系统软件iFIX与保护系统之间的通信。研究了OPC服务器的内部结构和工作原理,保护系统OPC服务器的开发中针对保护系统通信协议的特殊性开发了一套行之有效的解析方法。调试和测试表明,采用该方法实现数据通信可靠、稳定,便于系统组态化,缩短了开发周期。     

基于千兆以太网的CSNS RCS射频分布式控制系统架构

中国散裂中子源(China Spallation Neutron Source,CSNS)快循环同步加速器的射频系统的远程控制系统采用基于千兆以太网的分布式体系结构,其软件架构使用国际加速器界广泛使用的开源软件工具EPICS(Experimental and Industrial Control System)进行开发。系统主要由CPCI低电平控制器、高功率四极管放大器和偏流源机器状态监控网络、联锁保护系统、中控中转服务器和人机交互界面组成。论文主要介绍了该系统的基本功能和拓扑结构,以及各个组成部分软硬件的设计和实现。     

核辐射监测系统微信云平台构建

设计、构建了一种基于常用手机端APP软件"微信"实现对环境辐射剂量率实时监控的系统。该系统借助第三方云平台服务器使辐射监测仪连入互联网,通过网络云平台的特定网络接口使辐射监测仪与微信服务器建立起绑定连接。上层界面在微信APP上使用HTML5结合脚本语言设计,底层辐射监测仪采用碘化钠闪烁体搭配光电倍增管以及后端的WIFI模块、MCU模块等完成数据采集处理。在数据通信协议方面,选用了Websocket与MQTT协议组合的方式,提高了系统的通信效率。该系统实现了辐射监测仪的远程监护,界面设计简单、操作便利、实时性好、通信效率高。     

SCADA的氡室监控系统的采样控制与处理

以HD-7氡室作为背景研究了如何实现基于SCADA(Supervisory Control and Data Acquisi-tion,监控与数据采集)模式氡室自动监控控制,其中主要包括下位机如何实现对现场设备的控制,上位机如何对现场设备的运行状态监控和上下位机如何通信。该系统选用PCI8407作为现场控制设备采集板卡,上位机选用WinCC组态软件作为监控机实现对现场设备的运行状态的在线监控以及运行状态的调整,并根据氡室自动控制的要求,编写了相应数据处理控制方法,实现了对氡室的模糊控制。     

基于WinCC的负离子源中性束电源状态监控系统设计

本论文设计了基于WinCC的负离子源中性束注入（NNBI）装置电源监控系统以实现对NNBI运行状态的实时监控。该系统针对多种型号PLC控制器通过单边通信和Modbus通信协议进行系统集成，以WinCC组态软件作为平台开发人机界面，为实验运行人员提供了一个操作方便、交互友好、性能稳定的系统状态监控和诊断手段，为NNBI实验稳定可靠运行提供必需的保障。     

Identification of radiation treatment of wheat （Triticum aestivum. L）and rice （Oryza sativa. L） samples using thermoluminescence of contaminating minerals

Food irradiation is gaining popularity worldwide and this technology is important to improve quality and reduce the post harvest losses of food. Because of the rapid commercialization of irradiated foods throughout the world, compliance of different regulations relating to use of technology in different countries and demand of consumers for clear labelling of irradiated foods, there is need for the development of analytical methods to detect radiation treatment of food. Among several methods studied so far, thermoluminescence （TL） is an important method that can be used to find out the irradiation history of food that contain even a very minute amount of dust particles. In this study, the irradiated and unirradiated wheat and rice samples were analyzed using the TL method. The samples were purchased from the local market of Peshawar and irradiated to radiation doses of 0.5 and 1.0 kGy using Co-60 gamma irradiator at the Nuclear Institute for Food and Agriculture （NIFA）, Peshawar. The mineral contaminants were isolated by jet water, ultrasonic treatment, and density gradient. TL glow curves of the isolated minerals from irradiated and unirradiated samples were recorded between the temperature ranges of 50-500℃ using a TL reader. Generally, the glow curves for irradiated samples showed much higher TL intensities （TL1） than the unirradiated samples. The results were normalized by rerradiation of mineral samples to gamma-ray dose of 1.0 kGy followed by determination of the second glow curves （TL2）. The ratio of the area of first glow curve to that of second glow curve （TL1/TL2） was calculated for selected temperature intervals and compared with the recommended values for unirradiated and irradiated samples. Finally, the shapes of the glow curves for irradiated and unirradiated samples were also analyzed. On the basis of these results （comparison of TL-intensities, TL1/TL2 ratios and shapes of the glow curves）, all the irradiated and unirradiated samples of wheat and rice were unequivocally identified.     

有效探测面积大于1000 cm2的正比计数器测量系统性能测试

为对自制的活性面积高达1 000 cm²的大面积源进行表面发射率定值,同时作为现有2πα、2πβ表面发射率标准装置能力的扩充,研制了一套内置式大面积2π多丝正比计数器测量系统,并利用活性区直径为8 mm的²⁴¹Am点源及活性区面积为10 cm×15 cm的大面积²⁴¹Am和⁹⁰Sr-⁹⁰Y源对其进行计量学性能测试。结果表明：计数器内计数响应均匀性优于±0.4%,有效探测面积达1 400 cm²;所得²⁴¹Am源高压坪曲线的坪长为1 400 V,坪斜为0.27%/100 V,坪区内计数变化为0.87%;⁹⁰Sr-⁹⁰Y源高压坪曲线的坪长为300 V,坪斜为0.75%/100 V,坪区内计数变化为0.80%;10次测量重复性好于0.4%,8 h内短期稳定性好于0.3%,1 a内长期稳定性好于0.8%。     

Preparation of Zn/TiO2 powder and its photocatalytic performance for oxidation of P-nitrophenol

Zn-doped TiO2 catalysts were prepared using a sol-gel method and characterized by XPS,UV-Vis, BET, XRD in this study. Under the irradiation of simulant sunlight, the photocatalytic activity for the degradation of p-nitrophenol was studied too. After irradiation for 2.5 h, the degradation percentage of p-nitrophenol could rise to more than 80 %. The results showed that the spectrum absorption band edge of Zn/TiO2 powder does not broaden obviously comparing with pure TiO2 powder. Zinc exists as Zn （11）. When calcined at 973 K, there is a new phase as ZnTiO3 in Zn/TiO2 catalyst. The order of photocatalytic activity of Zn/TiO2 catalysts calcined at different temperatures for p-nitrophenol is 773 K 〉 673 K 〉 873 K 〉 573 K 〉 973 K and the photocatalytic activity of Zn/TiO2 catalyst calcined at 773 K is better than TiO2 catalysts heated at the same temperature, and outclasses that of commercial TiO2 catalyst. It also showed that the photocatalytic degradation of p-nitrophenol follows first-order kinetics under the irradiation of simulant sunlight.     

Current status of radiation therapy for prostate cancer

Radiotherapy for the treatment of prostate cancer has been extensively explored in the past. Along with the comprehensive understanding of the biology of prostate cancer and rapid advances in terms of technology, the out- come of treatment for the patients with prostate cancer has improved. The authors review radiotherapy as the primary treatment for the disease, with particular emphasis on the technological advances from both the radiobiological and radiophysics aspects. Nonconventional fractionated irradiation like hyper- or hypo-fractionation has been imple- mented in the clinic, the final results still need to be confirmed in the future. Technological advances like IMRT, IGRT, in the last two decades have significantly improved the delivery of external radiotherapy to the prostate. This has re- sulted in an overall increase in the total dose that can be safely delivered to the prostate, which has led to modest im- provements in the biochemical outcome. However, establishing the standard therapy for prostate cancer remains con- troversial. It is hoped that the next decades will bring continued advances in the development of biologicals that will further improve current clinical outcomes.     

The control system for SSRF injection and extraction

This paper introduces the injection and extraction control system design for SSRF,which is a distributed control system aimed at stability and reliability of the pulse power supplies,PPS(Personnel Protection System)and MPS(Machine Protection System).The hardware environment is mainly based on PLC(Programmable Logic Con- troller),and ARM(Advanced RISC Machine)is also applied for studying stability of the power supplies.WinCC and EPICS(Experimental Physics and Industrial Control System)have been selected as the platforms of SCADA(Super- visory Control and Data Acquisition).For unifying the interfacing to the control computer,all front-end equipments are connected via Industrial Ethemet.     

Interaction between uranium and humic acid (Ⅰ): Adsorption behaviors of U(Ⅵ) in soil humic acids

The adsorption behaviors of uranium on three soil humic acids (HAs), which were extracted from soils of different depths at the same site, were investigated under various experimental conditions. The adsorption results showed that U(Ⅵ) in solutions can be adsorbed by the three soil HAs, with the order of FHA (HA from 5 m depth of soil) ＞SHA (HA from the surface) ＞THA (HA from 10 m depth of soil) for adsorption efficiency in each desirable condition, and the adsorption reached equilibrium in about 240 min. Although the maximum adsorption efficiency was adsorption could be described with Langmiur isotherm or Freundlich isotherm equation. The L/S (liquid/solid, mL/g)ratio and pH were important factors influencing the adsorption in our adsorption system besides uranium concentration. The adsorption efficiency decreased with the increase of the L/S ratio and pH at the pH range of 2.0-3.0 for SHA and THA or 2.5 - 6.0 for FHA. However, no significant difference in adsorption of U(Ⅵ) was observed at the experimental temperature. All the results implied that humic substances have different characteristics in samples even collected at the same site.     

水平管内含空气蒸汽强制对流冷凝换热模型研究

为研究含空气蒸汽在水平管内强制对流冷凝换热特性,基于对传热传质过程的分析,建立了管内为环状流与波状流条件下的流动冷凝换热模型。从潜热、显热和液膜3个环节对整个换热过程进行建模,最终得到计算局部冷凝换热系数的理论关系式。模型预测结果与实验数据的对比表明,二者相对偏差在±20%以内,验证了该换热模型的准确性与适用性。通过进一步的研究发现：从换热管入口至出口,随着冷凝的进行,管内换热主要热阻由液膜热阻向气液界面的凝结热阻转变;主流气体对流换热过程基本可忽略。     

Information for authors

<正>1.NUCLEAR SCIENCE AND TECHNIQUES(NST),a bimonthly journal,is devoted to all aspects of nuclear science and technology,theoretical or experimental.Its special interest lies in the subjects of synchrotron radiation science and technology;low energy accelerators,radiation technology and applications;radiochemistry,radiopharmaceuticals and nuclear medicine;nuclear electronics and instrumen-     

PLASMA SCIENCE AND TECHNOLOGY AUTHOR INDEX TO VOLUME 16(2014)

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Web Services interface of SSRF archive data analysis system

Accelerator database stores various static parameters and real-time data of accelerator. SSRF (Shanghai Synchrotron Radiation Facility) adopts relational database to save the data. We developed a data retrieval system based on XML Web Services for accessing the archive data. It includes a bottom layer interface and an interface applicable for accelerator physics. Client samples exemplifying how to consume the interface are given. The users can browse, retrieve and plot data by the client samples. Also, we give a method to test its stability. The test result and performance are described.