Z-pinch实验数据集中管理设计及实现

Z-pinch研究中进行的实验具有信号瞬发、数据量大、数据种类繁多等特点,实现实验数据网络数字化集中管理是信息化时代实验管理的迫切需求。描述了数据拆分和组合存储关键技术,说明了多条数据记录之间共享大容量附件数据的思路。结果表明实现数据集中快速管理,不仅能较好地挖掘和利用历史数据,并且对后期的实验具有及时的指导作用。     

高能物理实验径迹系统流式数据获取框架的研究

高能物理实验研究基本粒子及其相互作用,需要获取和分析大量的实验数据以发现新粒子或测量已知粒子的特性.随着高能物理实验规模的不断扩大以及加速器能量和亮度的不断提升,海量数据的获取、处理及分析将更具挑战性.在高能物理实验中,径迹系统探测器的通道数和数据量尤为巨大,为了读出和在线处理径迹系统探测器产生的海量数据,本文结合Ha...     

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。     

上海光源数据存档引擎的设计与实现

EPICS是目前国内大型加速器装置普遍采用的分布式控制系统软件平台。Channel Archiver为EPICS自带数据存档工具集,主要用于实现对试验数据的快速存取和检索,作为其核心的Archive Engine,专门负责数据的存档工作。通过对Archive Engine进行的分析,提出其应用于上海光源的不足之处。针对这些不足,结合了最新的XML技术对存档引擎进行了修改,并对修改后的引擎进行了测试。     

实时可控的数据备份与维护技术在大型集装箱检查系统中的应用

对大型集装箱检查系统中产生了大量辐射成像数据,如何对数据进行有效的管理,对整个系统的稳定、可靠运行起着重要的作用。介绍了一种实时可控的磁带备份、恢复与磁盘数据维护技术方案在该系统中的应用。     

辐射成像无损检测系统远程控制和图像实时传输网络的实现

将网络和通信技术引入数字辐射成像无损检测系统，建立一个基于TCP／IP协议的网络结构，采用Client/Server的通信模型，实现射线无损检测系统的网络控制和实时无程图像传输。     

Implementation and integration of a systematic DBPM calibration with PLL frequency synthesis and FPGA

Beam current dependence resulted from nonlinearity and asymmetry of the four channels of digital BPM(Beam Position Monitor) processor deteriorates the BPM performance.A systematic solution based on signal source calibration tactics has been carried out to rectify this defect.It is optimized for implementation in FPGA.Mathematical illustrations of the calibration method,hardware and software design and implementation are presented.A signal source circuit using frequency synthesis technique is designed as calibration standard.Data acquisition system using JAVA web technology and Ethernet is introduced.Integrated FPGA implementation code architecture is presented,and experimental test results show that the method implemented in FPGA is feasible.Compared to other methods,our approach can rectify the nonlinearity and asymmetry simultaneously.The whole solution is integrated into the DBPM processor and can be executed online.     

Examination of 131I and 137Cs releases during late phase of Fukushima Daiichi NPP accident by using 131I/137Cs ratio of source terms evaluated reversely by WSPEEDI code with environmental monitoring data

To investigate what happened in reality during the Fukushima Daiichi Nuclear Power Plant accident, the phenomena within reactor pressure vessel and the discussion of ties with the environmental monitoring measurement are very important. However, the previous study that treats phenomena of the both has not necessarily advanced up to the present time. The source terms predicted by simulation codes such as MELCOR has not yet been consistent with the reverse estimation by WSPEEDI code using environmental measurement data. This study investigated ¹³¹I and ¹³⁷Cs release behaviors during the late phase of the accident to contribute to such examination using the ¹³¹I/¹³⁷Cs ratio of the new source terms predicted by Katata. The ¹³¹I release by the gas–liquid partition from the contaminated water in the 1F2 and 1F3 reactor buildings which was pointed out in the previous study was reevaluated using the new source terms. In addition, paying attention to the similarity of the core conditions between the Fukushima accident and the Phébus FPT3 experiment using the B₄C control rods, the release of organic iodine (CH₃I) during the 1F3 suppression pool venting, formation of CsBO₂ and its release behavior were examined which have not yet been sufficiently studied so far.