基于网络处理器应用中网包保序机制研究

网包保序是高层协议对网络设备的严格要求。网络处理器（NP）中广泛采用的并行处理架构对保序机制的实现提出了新的挑战。通过理论分析比较了临界区轮询（CSRR）和线程池（POTS）两种保序模型在NP体系结构下的性能,提出在实际网络环境中POTS性能更优。在NP的代表性设计Intel IXP2400上的实测表明,POTS比CSRR性能高1.7％-102%。     

脉冲TIG焊熔池几何参数的计算机视觉检测

利用自行建立的基于计算机视觉的脉冲ＴＩＧ焊熔池几何参数检测系统,从工件的正面利用ＣＣＤ传感器拍摄到了清晰的熔池图像,针对熔池图像的特点,设计了快速有效的图像处理算法,实时检测出了熔池的最大宽度、半长、后部面积、后拖角等重要几何参数,为下一步对焊接质量实时控制打下了良好基础。     

涟源坳陷中部构造带勘探潜力分析

裸露海相地层的勘探潜力一直是石油地质工作者所关心的问题。从涟源坳陷中部构造带基底性质、沉积盖层演化等方面入手,分析了各构造运动时期的应力性质,重点分析了中部构造带的构造样式及其形成机理,指出中部构造带的构造样式是盖层滑脱型,其关键构造要素是犁式叠瓦状逆冲断层和倾向腹地式的双冲断层系,构造变形主要发育于印支期,定型于燕山早-中期。结合烃源岩特征、资源潜力、储层盖层条件、埋藏情况等,查明了主要的生烃时期。通过分析油气运移与构造圈闭形成之间的配套关系,指出了勘探方向。     

一种改进的数据库连接的设计与实现

文章结合JDBC技术和数据库连接池，设计并实现了一个改进的数据库连接方法。该连接方法提高了建立数据库连接的速度和效率。     

基于Linux的预先创建子进程池的服务器程序设计

分析了服务器程序的通用设计方法的缺点 ,并介绍了一种在Linux操作系统下预先创建子进程池的服务器程序设计方法 ,在原理上进行了详细的讨论 ;最后给出了一个笔者实现的原型系统的主程序结构框架     

MVC模式下数据库连接池的Web应用方案

针对目前大多数Web系统不稳定、低效率以及无法满足日益增长地访问请求的缺点,通过对传统Web开发技术中存在的问题和现有数据库连接池技术进行分析,设计了基于MVC模式和连接池技术的高效稳定的多层Web系统,并阐明了各逻辑层的请求处理逻辑及实现方案,最后深入讨论了此方案中的关键问题。     

On the consistency in variations of the South China Sea Warm Pool as revealed by three sea surface temperature datasets

The areal and intensity indices of the South China Sea Warm Pool (SCSWP) derived from three datasets, the Advanced Very High Resolution Radiometer (AVHRR), Tropical Rainfall Measuring Mission's Microwave Imager (TMI) and Optimum Interpolation Version 2 (OI.v2) sea surface temperature (SST), are generally consistent with each other at monthly, seasonal and interannual scales. However, the three records are different in some cases. First, minor differences among the monthly records of intensity index are observed in the period July to September. Secondly, the interannual records of SCSWP intensity derived from AVHRR and OI.v2 are different in autumn during the period 1990-1996. The reason is not yet clear and nor is it clear which record best represents fluctuations in SCSWP intensity. These suggest that various drawbacks of the three datasets, such as low resolution of OI.v2, and cloud and rain contamination on AVHRR and TMI data, would be serious enough to allow deviation from each other to appear. Merging AVHRR and TMI SST data might be the way leading to a more convincing time series of SCSWP. In addition, changes of areal and intensity indices are not always consistent with each other, for example, they have different monthly patterns. Although the three interannual records of intensity index in three seasons all capture the main Multivariate ENSO Index (MEI) signals at a half-year lag, only those which are in the summer significantly correlated with MEI.     

基于MSC Pool的软交换组网策略

随着软交换大规模投入使用,如何在兼顾网络资源、注重网络安全的基础上,有效简化网络扩容、合理配置MSC/MSC Server的容量及分担话务已经成为中国移动日益关注和重视的焦点。文章通过对MSC Pool技术原理、基本业务流程以及特点优势的介绍,由此引入基于MSC Pool的软交换组网策略,并就发展趋势、规划原则以及最终目标做了分别阐述和分析。     

Fouling of tube bundles under pool boiling conditions

This paper aims to provide experimental heat transfer results for boiling of CaSO₄ solutions on the outside of tube bundles, and also to shed some light into the mechanisms which influence heat transfer fouling under pool boiling conditions. Heat transfer coefficients for three heater rods with an identical diameter of 10.67 mm on a 35 mm vertical pitch have been measured. The independent variables bulk concentration and heat flux have been varied from 0.8 to 1.6 g/L and 33 to 300 kW/m², respectively. The experimental results show that the mechanisms of fouling on the middle and top heater substantially differ from those at the bottom heater, due to the dominant effects of bubble impingement on the heat transfer surfaces. In particular, the competing effects on the degree of wall superheat and the supersaturation of the boiling liquid play a significant role. Spalling effects are more pronounced on the upper heaters where thin, friable deposits were found with low density and adherence, particularly at higher heat fluxes and lower concentrations. In terms of tube bundle efficiency, the best results were found for lower concentrations.     

大型油罐破裂泄漏特征研究

统计了多起油罐破裂事故,并对油罐破裂特征及油品泄漏流场进行分析。通过事故案例统计,总结了三种典型的油罐破裂形式,得到了油罐易发生破裂的位置及原因。对事故案例后果进行分析,将油罐破裂泄漏过程分为两个阶段,并分别对其流场特性进行研究。以平板流动临界雷诺数为判定准则,对油库常见油品泄漏流动雷诺数进行计算,得出泄漏油品的流态绝大多数为完全发展的湍流。