The clinical analysis of three methods in the treatment of intracranial bacterial infection

Objective To analyze the effect of three therapeutic methods to find an optimal approach to the treatment of intracranial bacterial infection by retrospectively reviewing 33 intracranial bacterial infection patients who were admitted from 1995 to 2008 in oar hospital. Methods The treatments by intermittent lumbar puncture,continuous lumbar subarachnoid space drainage, and embedment of Ommaya cyst for continuous drainage from the ventricles were performed in 15 cases, 12 cases, and 6 cases respectively along with intravenous application of full dose of antibiotics. Results Nineteen cases were cured and the best prognosis was from the group of Ommaya cyst embedment and continuous drainage from the ventricles. Conclusion Management goals are prompt recognition of the central nervous system (CNS) infection, rapid identification of causative organisms and initiation of treatment with the optimal management methods for complications. Embedment of Ommaya cyst for continuous drainage from the ventricle is a safe and effective treatment for intracranial bacterial infection.     

城市轨道交通信号电源系统可靠性分析

城市轨道交通信号电源系统为信号系统提供可靠稳定的供电,其可靠性需纳入信号系统进行考虑,以实现系统整体的可靠性目标。对目前信号系统常见的电源系统结构进行了分析,并建立了相应的可靠性模型。比较了不同方案的可靠性及主要影响因素,为提升信号系统整体可靠性提供参考。     

天然气爆炸对盾构隧道的作用机制及工后修复

为了使爆炸灾害后的盾构管片得到合理的修复方案,以某地铁盾构施工过程中挖破天然气管道导致爆炸事故为背景,通过介绍爆炸的基本特性、冲击波的传播特点及火焰波的伴生关系,归纳在天然气爆炸过程中,爆炸火焰和冲击波是决定事故危害程度的2个主要因素,同时这些因素中最危险、破坏力最强、破坏区域最大的是冲击波的破坏效应。通过计算隧道内满布天然气时的TNT当量,以及采用拟静力法模拟管片内部的超压分布并计算得到管片的变形,与第三方检测数据中的管片变形指标进行耦合,证明模拟的准确性,为提出合理的区间修复方案提供依据,同时也为类似工程事故的处理和预案提供经验。     

Integrated coastal water monitoring

Geographical Information Systems (GIS) are important took for environmental monitoring and management. However, their limitations in dealing with complex, dynamic, and mission‐critical situations call for alternative approaches. Integrating GIS with dynamic simulation models offers one such solution. Numerical models that simulate physical, chemical, and biological processes greatly increase our understanding of the environment. Many of these models use refined forecast information to accurately predict processes that help in monitoring and managing the environment. Integrating these models with GIS offers new functionalities. The present research couples the MIKE21 comprehensive modeling system for two‐dimensional free surface flows with the spatial analysis strengths of the ArcView GIS. The southern coastal water system of Singapore serves as the study area. The aim is to develop a comprehensive software system that provides support for both environmental managers and land‐use planners in making their decisions.     

西安地铁隧道中隔墙加台阶法施工诱发的邻近桥桩变形及其控制措施

采用FLAC3D软件预测了地铁中隔墙加台阶法施工诱发的邻近桥桩变形规律,结果表明:桥桩最大水平变形和倾斜率均超出变形允许值,必须对既有桥桩采取加固措施才能确保其在地铁施工期间的安全使用。提出了采用袖阀管注浆技术控制桥桩变形的措施,并制定了现场监测方案。实测结果表明,加固措施能够确保桥桩变形在允许范围内,证明了提出的变形控制措施合理有效。     

地铁闸机紧急放行控制器的探讨

为了保证紧急情况下乘客的安全,地铁各车站均安装有紧急按钮,用于控制闸机的紧急放行。介绍了闸机紧急放行控制器系统构成和工作原理,分析了闸机异常放行的主要原因,并对紧急按钮采用常闭接点和常开接点的优缺点做了比较。使用常闭方式更能及时发现故障,保证紧急放行时能及时响应。     

运用微机监测道岔电流曲线分析提速道岔故障

S700K电动转辙机正常道岔动作电流曲线与故障情况下动作电流曲线的对比观察,能及时发现道岔存在的隐患,以便查明原因,有针对性地采取消除措施,有效地提高现场设备的运用质量。     

模糊层次分析法在高技术企业创业环境评价中的应用

研究高技术企业创业环境评价问题，运用系统分析方法构建了高技术企业创业环境评价指标体系，在此基础上深入研究了模糊层次分析法在高技术企业创业环境评价中的具体运用．结果表明模糊层次分析法是高技术企业创业环境评价的一个新的、有效的方法，最后对模糊层次分析法应用的局限性作了简要的分析．     

Assessment of the volume of fluid method for free-surface wave flow

This study was concerned with the free-surface wave flow around a surface-piercing foil. The volume of fluid method implemented in a Navier–Stokes computational fluid dynamics code was employed. Three widely used discretization schemes for the volume of fluid method were assessed for a test case that involved general ship waves, spilling breaking waves in front of the leading edge, and bubbly free surfaces in separated regions. A single computational approach was selected for the comparison, and a grid-dependence study was carried out. The computational results were validated against existing experimental data, showing good agreement. The validation results suggest that all three discretization schemes perform well, but the best and most efficient results were obtained using the high-resolution interface capturing scheme.     

The Necessity of Establishing a Regional Marine Research Program for the U.S. West Coast

The welfare of the marine environment of the U.S. West Coast of California, Oregon, and Washington is hindered by insufficient understanding of ecosystem dynamics and human pressures. Greater coordination, integration, and support of mutually identified research priorities across research organizations on the West Coast are necessary. This level of collaboration is essential to responding to regional ecosystem threats, such as the impacts of human occupation of coastal areas, over-harvesting of marine resources, and climate change. To address this need for collaboration and build on the accomplishments of existing research organizations, this article advocates the establishment of a West Coast regional marine research program (RMRP).