蓝色鸣鸟的承诺

当我们驾车向西穿过宾西法尼亚州时，大地披着一层冬装。虽然这不是想念蓝色鸣鸟的季节，但我却无法将它从头脑中驱赶。     

High Power Fiber Bundle Array Coupled LDA Module

1 Introduction High power laser diode arrays (LDA) have many advan- tages such as small volume, long working life, high slope efficiency and high optical density, so they have many applications in medical treatment, material pro- cessing, and for the pumping source of solid laser and etc. But unfortunately, the LDA can not be easy to use directly in these fields because of their poor beam quality and extremely asymmetric divergent beams (!x≈ 5°～10°and !y≈20°～35°, for example), so it …     

结晶岩内油气的成因和油气藏的形成机理

近几年来，由于在结晶岩内发现了大量油气储量又再度引起了“生物”与“非生物”油气成因说派之间的争议。     

奥地利KELAG公司的水电站发挥重要作用

奥地利KELAG公司的水电站100多年来发挥了重要作用,克恩滕州为此于2005年10月举行了一系列纪念活动。该州是奥地利水电开发的重要地区,有许多重要蓄水和径流式电站,回顾了该地区水电开发的历史,包括正在进行中的和已规划的水电开发的更新和升级。介绍了重要的Fragant水电工程规划,在Wurtenalm大坝的下游增加了新的压力隧洞和发电厂房。     

全数字LCoS器件向业界发起挑战

一种命名为Carley的创新型全数字LCoS技术有望使价格低廉、品种繁多且易于扩缩的反射器件在市场上大行其道,这些器件将造就分辨率达1080p的低成本、宽屏高清晰度电视(HDTV)。     

集成道路上SoC与SiP谁主浮沉？

与昌圆双雄(台积电、联电)有着密不可分的IC设计服务公司创意与智原,于2003年8、9月接二连三的成立IP Mall,其希望透过IP(Intellectual Property)交易平台的建立,授权给IC设计业者加速重复使用IP以缩短芯片开发时间,也迫使SoC(System-on-a-Chip)与SiP(System-in-a-Package)的争夺战再一次浮上台面。     

WAVE INTERACTION WITH PERFORATED CAISSON BREAKWATERS

The reflection coefficient of perforated caissons and the total horizontal forces acting on them were experimentally and numerically analyzed and discussed when wave propagates normally. To consider the viscosity effect of fluid and nonlinear action of waves on structures, the VOF (Volume Of Fluid) method combined with the k-ε turbulence model was used to simulate the interaction between waves and structures. Governing equations were solved with the finite difference method. Through 2D experimental study in the wave flume, the empirical relationship between the reflection coefficient of perforated caissons and the main affecting factors were obtained from the experimental data using the least square method. Also the correlation between the ratio of the total horizontal force acting on perforated caisson and the force acting on solid caisson and the main affecting factors were regressed from the experimental data.     

实时GPS定位中的自适应故障检测

给出了一种GPS卡尔曼滤波的自适应方案,该方案能根据GPS导航中变化的动态来估计协方差.当增强卡尔曼滤波器时,方案可得到更精确的定位修正.此外,也可将此估计方法用于完整监测,以增强故障检测的阈值选择.采用模拟数据验证了提出方法的正确性.     

应用斯通利波反射与高分辨率慢度测量方法探测地层中的薄气层

探测地层中的气层是地层评价的一项重要课题，通常，气体存在于小的矿穴或薄层/由薄层组成的地层中，由于常规测井的纵向分辨率通常较低，致使它们经常被忽略，本文介绍的是使用斯通利波反射和高分辨率慢度两种测量方法对薄气层进行声学测定。与围岩地层相比，一个饱和气地层具有明显不同的流体迁移率和可压缩性，在对这种地层进行声学测井过程中，流体迁移率/可压缩性的巨大变化使我们可以测量到斯通利波反射，并且它对于地层厚度不是很敏感，因此，斯通利波反射能够用于对薄气层的探测。但是，慢度测量却是受气层厚度的探测。近年来，随着慢度分析方法的不断发展，小于0.5英尺的薄气层也能被探测到了。组合使用斯通利波和慢度测量法能够保证结果的准确度。