基于网络的分布式水质监控系统设计

结合我国水质监测工作的现状,提出了一种基于网络的水质在线监测系统的设计方案,开发出具有三层网络架构的水质在线监控系统。该系统以LabVIEW为测控平台,具有Web化功能,使得基于网络的远程水质在线监测成为了可能。     

Memory Management for Real-Time Java: An Efficient Solution using Hardware Support*

This paper addresses the issue of improving the performance of memory management for real-time Java applications, building upon the real-time specification for Java (RTSJ) from the Real-Time Java Expert Group. In a first step, a collecting dynamic memory solution including both a real-time garbage collector and region-based memory management, is proposed. A thorough analysis of the parameters influencing the performance of write barriers in memory management, together with ways of improvement are then presented. Finally, the implementation of a memory management solution compliant with the RTSJ and integrating the proposed improvements is sketched.     

基于MBO的高科技企业员工绩效评价指标体系

从目标管理的原理出发,结合高科技企业员工的特点以及人力资源管理现状,提出了基于MBO的高科技员工的绩效评价指标体系.     

XNode:一种新的利用RDBMS来存储与检索XML的方法

XML作为互联网上数据表示和交换的标准正在飞速发展,利用RDBMS来存储与检索XML文档是发展的一个趋势。文章提出了一种新的基于路径存储与检索XML文档的方法XNode,采用了前缀加序号的编码策略,并且给出了具体实现方法及实验结果。结果表明该方法的效率高,适用范围广。     

Transfection of glutathione S-transferase (GST)-pi antisense complementary DNA increases the sensitivity of a colon cancer cell line to adriamycin, cisplatin, melphalan, and etoposide

The goal of this study was to demonstrate that glutathione S-transferase (GST)-pi is directly involved in the intrinsic and acquired resistance of cancer cells to anticancer drugs. To this end, GST-pi antisense cDNA was transfected into the cultured human colon cancer cell line M7609, which expresses an innately high level of GST-pi and shows intrinsic drug resistance, and into an M7609 strain with acquired resistance to Adriamycin (ADR;i.e., M7609/ADR cells). The changes in the sensitivity of these transfectants to various anticancer drugs were investigated. The intracellular concentrations of GST-pi in M7609/anti-1 cells and M7609/anti-2 cells, two clones that were established by transfection of GST-pi antisense cDNA into M7609 cells, were decreased to approximately half of those detected in the parent cells (M7609) and in the control cells transfected with vector alone (M7609/pLJ). The sensitivities of the antisense transfectants in relation to ADR, cisplatin, melphalan, and etoposide were increased -3.3-fold, 2.3-fold, 2.2-fold, and 2.1-fold, respectively, compared with those of M7609 and M7609/pLJ. On the other hand, the sensitivities of the antisense transfectants to Taxol, vincristine, 5-fluorouracil, and mitomycin C were not significantly changed. Similarly, the transfection of antisense cDNA into M7609/ADR cells resulted in the reduction of intracellular GST-pi concentration (by about half) and an increased sensitivity to ADR (4.4-fold), but no increase in 5-fluorouracil sensitivity. Thus, GST-pi is considered to be a multidrug resistance factor that is responsible for both the intrinsic and acquired resistance of cancer cells to anticancer drugs such as ADR, cisplatin, melphalan, and etoposide.     

使用移动平均线预测云平台服务性能趋势

系统性能预测为有预见性的资源调度提供依据,是云平台管理的重要方面。从数据收集、数据处理和预测方法三个方面总结性能预测方法。提出采用移动平均线方法来预测服务性能的长期发展趋势。针对性能小范围波动时会频繁改变预测信号的问题,进一步改进此方法,引入标准差以有效过滤抖动信号。在亚马逊弹性计算云环境下验证了方法的有效性。     

基于分段地址结构的快速路由查找算法

根据IPV6地址结构和骨干路由表特点,分析了原有路由查找算法,基于IPV6的掩码长度和分段地址,采用Hash表和多分支Trie树结构,提出了一种快速的IPV6路由查找算法。根据分段地址和掩码将最常用到的路由前缀按前缀长度设置Hash表,并将前缀值有序存放在表结点中。不仅可以进行前缀长度的二分查找,同时又是其它前缀匹配的索引。对于其他的前缀匹配问题,根据Hash表中的索引到相应的多分支Trie树完成最长前缀匹配。实践证明该算法具有较好的时空效率,可以较好地提高路由查找速度。     

220MW汽轮机DEH系统挂闸异常现象的分析及对策

2004年#2机组大修后启动过程中,出现了汽轮机挂闸后随即打闸的异常现象。通过观察、分析、试验,确定了造成挂闸异常的原因并提出了解决问题的办法,克服了汽轮机挂闸后自动打闸的现象。     

The formation of protective films on iron-silicon alloys

The oxidation of high purity FeSi alloys was studied over the temperature range 765–965°C by means of a micro-balance. In hydrogen with 2.5% water vapour only silicon was oxidized. Specimens with 1% Si showed mostly internal oxidation. External layers of SiO₂ formed on specimens with 2 and 3.4% Si. These layers also hindered the oxidation of iron. The oxidation of Fe could be distinguished from oxidation of Si by reduction of the Fe oxides. The low oxidation rates reached at 865° after long times of exposure were ascribed mainly to the oxidation of Si.     

页岩气钻完井技术现状及难点分析

页岩气勘探开发在中国刚刚起步,缺乏相关技术经验。为此,介绍了国外页岩气钻完井技术现状及最新进展。国外页岩气开发先后经历了直井、单支水平井、多分支水平井、丛式井、丛式水平井钻井（PAD水平井）的发展历程;目前水平井已成为页岩气开发的主要钻井方式,页岩气水平井钻井要考虑其成本,垂直井段的深度不超过3 000 m,水平井段的长度介于500～2 500 m;PAD水平井钻井利用一个钻井平台作为钻井点,先后钻多口水平井,可以降低成本、节约时间,是比较新的页岩气钻井技术;页岩气固井主要采用泡沫水泥固井技术,完井方式以套管固井后射孔完井为主。在综合分析国外页岩气钻完井技术及钻完井难点的基础上,指出国内页岩气钻井应着力解决在保持井壁稳定、预防事故、降低钻井成本、研发配套仪器和优选钻井液配方等方面存在的问题。