BELLEII实验高速数据接收板的设计

在高能物理实验中,随着加速器和探测器性能的提高,数据获取系统正面临着越来越大的海量数据实时可靠传输的挑战。BELLEII探测器是运行在SuperKEKB高亮度加速器上的新型探测器,其数据获取系统也面临这一难题。基于FPGA的高速数据接收模块(HSLB)作为数据获取系统的数据传输核心,采用RocketIO技术实现高速串行数据传输,满足速率3.125 Gbps的设计要求;与专用接口连接的CPLD作为控制芯片在线配置FPGA固件,提供快速硬件程序加载,高速链路共享,高速数据传输和慢控制命令传输的功能。论文详细描述了高速数据传输模块的硬件设计、在线配置FPGA的实现方案。经过测试,该模块成功实现设计目标,并已经按工程进度进行了小批量生产。     

基于以太网传输的高速32通道数据采集系统

本文介绍了一种基于以太网传输的32路高速数据采集系统,该系统主要用于核燃料棒质量检测中,可以对核燃料棒检测传感器发送的数据进行采集和分析。该系统包括数据接收模块、系统控制模块、网络通信模块和上位机数据分析控制软件四个部分。系统使用FPGA来进行数据的接收和计数,使用ARM作为整个系统的主控芯片来控制各个模块之间协调运行,同时利用ARM对数据进行组包并将组包后的数据通过以太网传输到上位机,最后由上位机对数据采集装置上传的数据进行接收和处理。经测试证明系统工作稳定,可以达到工业检测要求。     

CT无线数据传输系统的研究与设计

研究了CT中无线数据传输系统的结构和控制方式,并对该系统进行了完整设计。在设计中采用了可编程逻辑器件控制高速数字无线收发元件nRF2401的方式。用VHDL语言编写了可编程逻辑器件的控制程序,实现了数据和指令的传输,同时对数据进行了纠错和辨识,并采用了多种措施提高系统的可靠性。实验证明,该系统传输数据快,准确率高,工作稳定可靠。     

高速可靠的工业CT数据传输系统研制

为满足工业CT数据传输的大容量、高速度和高可靠性要求,设计了基于USB2.0接口芯片的工业CT数据传输系统。在数据传输过程中,FPGA作为主控制器,USB2.0芯片CY7C68013A工作于Slave FIFO模式,将从数据采集系统获得的数据传输给上位机进行图像重建。测试结果表明,数据传输速度可达33 MB/s,传输准确率为100%,该系统能满足工业CT数据传输的要求。     

基于ARM-Linux的工业CT采集传输系统软件设计

为了满足高性能工业CT对采集传输系统高速、稳定、可靠的需求,开发了ARM+FP-GA构架的采集传输系统,并在此平台上设计了基于ARM-Linux的嵌入式采集传输系统软件.实验结果表明,该系统能够实现对数据的实时采集与可靠传输,并在多套工业CT/DR系统中得到成功应用.     

核电厂取水区水质智能监测系统设计

为满足核电厂的用水质量需要,设计了核电厂取水区水质智能监测系统。该系统为一种多元化智能水质监测系统:主要监测温度、氨氮含量、叶绿素含量等参数,同时对水下状况进行实时摄像。水下利用STC89C52RC单片机和相应传感器采集水质数据并以有线传输方式送到给水面;水面通过nRF24L01模块进行无线自组网并对数据进行传输;监测中心利用Lab VIEW平台实现对数据的监测、预警、分析。测试结果表明:该系统适用于核电厂取水区水质监测。     

基于FPGA的高速核信号采集系统设计

描述了一种基于现场可编程逻辑阵列(FPGA)的高速核信号采集系统的设计方案.FPGA作为控制核心,实现对高速Analog - to - Digital Converter(ADC)和Universal Serial Bus( USB)的逻辑控制和数字信号的采样、滤波、甄别、存储、传输处理,并使用异步First In First Out(FIFO)实现ADC数据采集模块和USB数据传输模块2个不同时钟域之间的数据传输,提高数据的吞吐率.最后利用上位机软件进行数据处理和绘图显示.测试结果表明,该系统能够实现核信号的实时、高效采集.     

重离子治癌加速器高速实时数据传输系统研制

分析了重离子治癌专用加速器对部分同步数据和过程数据的传输要求,提出并实现了一种高速率、可纠错、远距离的实时数据传输系统,以提高加速器同步和控制的效率和可靠性。系统优化了传统系统的硬件配置和布局。采用PXI、FPGA、SDRAM与远距离千兆光纤模块相结合的系统构架,替代了原数据传输过程中低速、近距离、抗干扰性不强的数据通路和处理器件。软件上,通过对两片FPGA的编程,在系统后端实现了PXI接口和DMA相结合的方式与加速器服务器进行数据交互;在系统前端实现了800 MHz载波100 MHz基带信号的实时、远程、高速串行帧传输。通过该数据传输系统,保证新加速器系统的同步事例、电源波形等实时数据在服务器和远端控制器之间的高效传输。     

多级蓝牙无线数据采集传输系统

提出一种基于单片机、多级蓝牙模块的高速、高旋飞行弹体无线数据采集传输系统,系统以多级蓝牙模块无线传输系统为核心,通过软硬件实现炮弹发射前初始参数、弹体出炮口初速等数据采集、发送、接收、处理的目的。实践证明,多级蓝牙无线数据传输系统在恶劣电磁屏蔽和高速旋转环境中可以可靠传输数据,为各种型号火炮初始、炮口初速等参数的装订、传输提供了应用依据[1]。     

高压电力电缆接头温度无线检测控制系统设计

基于无线传输技术、单片机技术、虚拟仪器技术等设计了一种电力电缆中间接头故障检测控制系统,系统利用低功耗数字温度传感器TMP100实现地下电缆接头温度采集,单片机MSP430F149作为中央核心控制单元完成数据分析与处理,并通过nRF401无线收发器实现了数据无线传输.文章对系统部分硬件及软件设计进行了详细介绍.通过实验测试,系统较好地满足了设计要求.     

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.     

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。     

Investigations on landmine detection by BF3 detector

Experiments were carried out to investigate the possible use of neutron backscattering for the detection of polyethylene (PE) sample buried in the soil. In detection of landmine by neutrons, the neutron detector and its shield play an important role. In this paper, the effects of graphite, heavy water, polyethylene and boric acid moderators on the flux of back scattered neutrons were investigated. We have also experimentally verified the effect of BF3 detector shield and obtained good agreement with theory.     

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.     

Assessment of radioactivity levels in some oil samples from the western desert, Egypt

Distributions of natural gamma-emitting radionuclides were determined in 93 oil samples collected from some petroleum fields in the western desert of Egypt. The radioisotope activities in the area under investigation lay in the range of (21 ± 4) to (38 ± 13) Bq?L-1 for 226Ra, (9 ± 2) to (15 ± 5) Bq?L-1 for 232Th, and (154 ± 28) to (303 ± 54) Bq?L-1 for 40K. The mean values were 27, 12, and 201 Bq?L-1, respectively. Among oils, variations in radionuclide ac- tivities could be on account of differences in TDS, HCO3, and Ba, with high or low pH. In this environment, oil prop- erties differently affected the mobilization of natural radionuclides. The range of 226Ra variation had been compared with available data from other countries. The calculated absorbed dose rate ranged from 22.33 to 32.66 nGy?h-1 in lo- cation (B) and (E) respectively, which was less than the accepted value.     

Preparation and properties of 117m Sn(IV)-TTHMP in in-vitro and in small animals

In this work,TTHMP was synthesized and labelled with 117m Sn.The preparation conditions,stability and lipophilicity of 117m Sn(IV)-TTHMP were investigated.Biodistribution of the complex in rabbits and mice was studied.It was found that the quantity of TTHMP and pH value of the prepararion solution had vital effects on the labeling yield of 117m Sn(IV)-TTHMP.It was also found that 117m Sn(IV)-TTHMP was hydrophilic and stable at room temperature and 37℃ in open air 117m Sn(IV)-TTHMP showed unexpectedly high bone uptake and bone-to-blood ratio in the animals.This made it potentially useful as an reagent for skeletal scintigraphy and radiotherapy of bone tumors.     

The role of AGFA high-energy CR in the calibration and quality control of multileaf collimators （MLC）

Linear accelerators equipped with multileaf collimators （MLC） are becoming more common and are widely used in the intensity-modulated radiotherapy （IMRT）. There is an imperative need to ensure the commissioning specification of the linear accelerators for the sake of quality assurance （QA） and quality control （QC）. This paper is aimed to investigate the role of AGFA high-energy CR （Computed Radiography） in calibrating dynamic multileaf collimators and evaluating the accuracy of the leaf position. The result shows that AGFA high-energy CR can easily and conveniently be used to calibrate MLC and verify its position. Hence, the application of AGFA high-energy CR is proved to be an accurate and time-saving method for routine MLC QC, especially when MLC calibration adjustments are required.     

Gamma radiation levels in the ambient environment of the QNPP Base

Monitoring results of gamma dose rate level in 1992～2004 in the ambient environment of the Qinshan Nuclear Power Plants(QNPP)Base,the northeast of Zhejiang Province,are reported in this paper.It is shown that the gamma dose rate of five monitoring sites of 2.5 km to QNPP Base is 84～113 nGy/h,with an average of 96 nGy/h in the 13 years.The average value is close to the background level of 93 nGy/h prior to operation of the QNPP Base,and is lower than the monitoring result of 101 nGy/h at the reference site in Hangzhou City.Within 50 km from the QNPP Base,the cumulative dose rate of the thermoluminescent dosimeter(TLD)is 90 nGy/h,which is lower than the back- ground level of 111 nGy/h.