放射性核素迁移的实验室研究——Ⅱ.用混合裂变产物溶液研究核素在地质材料上的吸附

应用裂变产物混合物做为示踪剂研究了~(137)Cs,~(141,144)Ce,~(103,106)Ru,~(103,106)Ru,~(95)Zr,~(95)Nb,~(89,90)Sr在花岗岩、凝灰岩、页岩上的吸附行为。应用批式技术测定了吸附比。核素的γ放射性是用连有SCORPIO-3000多道计算机系统的Ce(Li)探测器测量的。β放射性~(89,90)Sr是放化分离后在G-M计数器上测量的。结果表明:凝灰岩、页岩能强烈吸附Ce,Nb,Zr;吸附Cs居中;吸附Sr,Ru较差;花岗岩的吸附性能都差。     

环境放射化学研究中几个问题的讨论

本文从辐射环境保护和公众辐射防护的角度，讨论了放射性核素在环境中的迁移行为，放射性核素与环境介质的相互作用和放射性核素在环境中的形态等涉及到环境放射化学研究方向的问题，并讨论了它们之间相互依存的关系。     

Electrochemical injection of organic corrosion inhibitors into carbonated cementitious materials: Part 1. Effects on pore solution chemistry

This series of investigations was intended to clarify phenomena associated with electrochemical injection of the organic base corrosion inhibitors, ethanolamine and guanidine, into carbonated concrete. In Part 1, experiments were conducted with laminated specimens of carbonated cement paste, that were specially designed to facilitate analysis with adequate spatial resolution to assess changes in their pore solution phase chemistry after they had been subjected to constant current electrolysis between embedded cathodes and external anodes. The anolyte solutions provided sources of ethanolamine or guanidine in contact with the exterior specimen surfaces. Effects of variations in the applied current density and duration of electrolysis on the concentration profiles of the two inhibitors and the other main constituents of the pore solution phase were determined. The results have been used to underpin the development of a mathematical model, which is described in Part 2.     

异构数据库数据迁移的研究与实现

数据是业务运转的基础．是企业的宝贵资产。企业在系统升级过程中往往会遇到数据迁移问题,由于新系统与旧系统经常存在数据结构异构的情况．使数据迁移工作难以实现。开发一款异构数据库数据迁移工具,该工具通过框架程序在ODBC（Open Database Connectivity）开发平台以及XML技术的支持下实现数据结构异构的数据库数据迁移。     

Approximate migration coefficient of interfacial transition zone and the effect of aggregate content on the migration coefficient of mortar

In this study, the electrochemical technique is applied to accelerate chloride ion migration in mortar to estimate its transport properties. In order to investigate the effect of aggregate content on the chloride migration coefficient of mortar, specimens with different fine aggregate volume fractions were cast and tested. The chloride migration coefficient of mortar was determined experimentally as a function of the volume fraction of aggregate. The chloride migration coefficient of mortar is used to assess the dilution, tortuosity and interfacial transition zone (ITZ) effects of aggregate in the cement-based composites. A model modified from the Bruggeman theory for the migration coefficient of mortar is used, and the regression analysis is used to determine the approximate chloride migration coefficient of ITZ. Based on the experimental and regression analytical results, the approximate ITZ migration coefficient is 2.83, 1.76 and 1.55 times of the matrix migration coefficient for the ITZ with the thickness of 20, 40 and 50 μm, respectively.     

Strategies and methods for cloud migration

Legacy system migration to the cloud brings both great challenges and benefits, so there exist various academic research and industrial applications on legacy system migration to the cloud. By analyzing the research achievements and application status,we divide the existing migration methods into three strategies according to the cloud service models integrally. Different processes need to be considered for different migration strategies, and different tasks will be involved accordingly. The similarities and differences between the migration strategies are discussed, and the challenges and future work about legacy system migration to the cloud are proposed. The aim of this paper is to provide an overall presentation for legacy system migration to the cloud and identify important challenges and future research directions.     

IDE驱动程序分析及SATA驱动程序移植

SATA硬盘已经是目前多媒体应用中被广泛使用的存储介质, 而有些多媒体产品的Linux版本中, 并不支持SATA驱动框架。本文通过对Linux下IDE驱动框架及其相关的Linux驱动代码的分析, 提供了一种在IDE驱动程序框架下移植SATA驱动程序的方法。最后以SiI3512为例, 介绍了SATA驱动程序的移植过程。对于其它此类系统的移植具有很好的借鉴作用。     

“软件人”群在入侵检测系统中的协调控制

在深入研究大系统控制理论、人工智能和"软件人"智能检测技术的基础上,采用先进的分布式体系结构,提出一种基于"软件人"群(MSM)的智能入侵检测协商模型.模型采取无控制中心的"软件人"群体结构,避免了单个中心分析器带来的单点失效问题.每个数据采集部件、检测部件和分析部件都是独立的单元,不仅实现了数据采集的分布化,而且将入侵检测和实时响应分布化,提高了系统的健壮性,真正实现了分布式检测的思想.     

基于旅行计划图的移动Agent迁移策略研究

移动Agent为完成指定的任务,通常需要移动到多个主机上。迁移策略为移动Agent规划出最佳迁移路径,保证移动Agent正确、高效地完成任务。在分析现有迁移策略的基础上,提出一种基于旅行计划图的迁移策略,该迁移策略能根据当前网络的软硬件环境和其他负载信息,利用服务评估为移动Agent动态地规划出一条最佳迁移路径,充分体现了移动Agent的自主性和反应性。该策略还可避免网络断连、主机故障及服务失效引起的迁移失败。