Radiological risk analysis of particle accelerators

Considering the growing use of high-current accelerators in medicine, industry and research, there is a need for evaluating the hazard potentials of new accelerator systems from the design stage itself. The present paper discusses the factors taken care of in a radiological safety analysis of accelerators. Possible hazards identified are beam loss, target rupture, faulty components and personnel being trapped in an active area. Human error is one of the major factors leading to accelerator hazard. How radiation dose to both occupational workers and general public is reduced and taken care of are discussed.     

Construct Validation of the Dutch Version of the Impact of Event Scale.

The Impact of Event Scale (ES; M. J. Horowitz, N. Wilner, & W. Alvarez, 1979) is a worldwide-used self-report measure to assess the frequency of intrusive and avoidant phenomena after a variety of traumatic experiences. The purpose of this article is to assess the psychometric value of the Dutch version of the IES (D. Brom & R. J. Kleber, 1985) in several samples of individuals who had experienced various traumatic stressors. The reliability and structure of the IES were evaluated in 3 different samples (total N = 1.588). The reliability of the Dutch version of the IES was adequate across the various stressors. The construct validity was assessed by using confirmatory factor analyses. Outcomes revealed a robust structure over the various samples, generally supporting the composition of the original IES. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

从大亚湾核电站“T5”事件看ASSET运行事件评价指南

简要介绍了国际原子能机构安全重大事件评价队（ＡＳＳＥＴ）的评价方法，以及大亚湾核电站“Ｔ５”事件（控制棒落棒时同异常 ）的原因和纠正措施，并应用该方法对其进行了评价，指出了该评价方法在实际应用中所表现出来的一些优点及其局限性。     

Zinc--嵌入式操作系统Vxworks下的用户图形界面开发工具

本文从Zinc的概念、结构和运行机理等方面为使用Vxworks操作系统的用户介绍了一种新的界面开发工具,这种工具不但拥有面向对象的特点,而且拥有事件驱动的体制.它类似于Windows下面的可视化开发工具,使得用户开发工程得心应手.     

逆距离加权地震道内插法的应用

本应用逆距离加权法从边界道的倾角值估算插值区的内部倾角值。根据所估算的内部倾角值，利用Ｅｕｌｅｒ公式求解积分方程，可得到从一个边界点到内部点的同相轴时间，沿同相轴的时间再进行高精度振幅值就形成了插值地震道。通过合成地震数据和实际地震资料的处理，展示了该方法的实用性和有效性。     

支持容侵的安全群组通信系统体系结构的研究

本文对入侵容忍的模型和TTCB结构进行了分析，在MAFTIA节点基础上，增加了一个事件处理引擎的核心模块，使得节点在参与者层与站点层支持自由选择安全群组通信系统中的密钥协商协议和新的加密算法。以改进的MAFTIA节点为基本单元。构建了基于可信实时计算基的新型安全群组系统。该系统能够集成新的安全群组通信密钥协商协议，通过事件处理引擎模块完成群组通信安全的任务，在安全性能方面更为灵活，具有较好的可扩展性与容忍入侵能力。     

Combining stochastics and analytics for a fast Monte Carlo decay chain generator

Various Monte Carlo programs, developed either by small groups or widely available, have been used simulate decays of radioactive chains, from the original parent nucleus to the final stable isotopes. These chains include uranium, thorium, radon, and others, and generally have long-lived parent nuclei. Generating decays within these chains requires a certain amount of computing overhead related to simulating unnecessary decays, time-ordering the final results in post-processing, or both. We present a combination analytic/stochastic algorithm for creating a time-ordered set of decays with position and time correlations, and starting with an arbitrary source age. Thus the simulation costs are greatly reduced, while at the same time avoiding chronological post-processing. We discuss optimization methods within the approach to minimize calculation time, and extension of the algorithm to include various source types.     

SOI CMOS SRAM单元单粒子翻转效应的模拟

为简单快速模拟静态随机存储器(SRAM)的单粒子效应,在二维器件数值模拟的基础上,以经典的双指数模型为原型,通过数值拟合得到了单粒子效应瞬态电流脉冲的表达式,考虑晶体管偏压对瞬态电流的影响,得到修正的瞬态电流表达式,将其带入电路模拟软件HSPICE中进行SRAM存储单元单粒子翻转效应的电路模拟,通过与实际单粒子实验结果的对比,验证了这种模拟方法的实用性。     

绸墙 柔软的建构实践

文章中的项目位于一功能发生置换的老工业园区内,设计的任务是将一栋废弃的三跨老厂房改造成为建筑设计工作室。基于对场地气质的把握、对现有施工条件的考量,我们在新工作室的建造实践中融入了对参数化技术的探索以及对建构传统的反思:中国特殊国情下的实践应可在另一侧面推动建筑师对建筑设计与建造逻辑的重新定义。     

Advancing assessment and design of stormwater monitoring programs using a self-organizing map: characterization of trace metal concentration profiles in stormwater runoff

Stormwater runoff poses a great challenge to the scientific assessment of the effects of diffuse pollution sources on receiving waters. In this study, a self-organizing map (SOM), a research tool for analyzing specific patterns in a large array of data, was applied to the monitoring data obtained from a stormwater monitoring survey to acquire new insights into stream water quality profiles under different rainfall conditions. The components of the input data vectors used by the SOM included concentrations of 10 metal elements, river discharge, and rainfall amount which were collected at the inlet and endpoint of an urban segment of the Yeongsan River, Korea. From the study, it was found that the SOM displayed significant variability in trace metal concentrations for different monitoring sites and rainfall events, with a greater impact of stormwater runoff on stream water quality at the upstream site than at the downstream site, except under low rainfall conditions (≤4 mm). In addition, the SOM clearly determined the water quality characteristics for “non-storm” and “storm” data, where the parameters nickel and arsenic and the parameters chromium, cadmium, and lead played an important role in reflecting the spatial and temporal water quality, respectively. When the SOM was used to examine the efficacy of stormwater quality monitoring programs, between 34 and 64% of the sample size in the current data set was shown to be sufficient for estimating the stormwater pollutant loads. The observed errors were small, generally being below 10, 6, and 20% for load estimation, map resolution, and clustering accuracy, respectively. Thus, the method recommended may be used to minimize monitoring costs if both the efficiency and accuracy are further determined by examining a large existing data set.