修定初定震源参数的非线性方法的论述

计算机进行地震定位获得震源参数的快速性和精确性是地震定位的关键性指标,震源参数的最佳值往往都是通过反复修定初定震源参数而获得.非线性算法在函数优化和搜索方面表现出快速的收敛速度和高精度的目标值的优势.基于非线性算法这两点的优势,研究了遗传算法、模拟退火算法和粒子群算法等3种非线性算法在修定初定震源参数中的理论应用,以期望进一步提高获得震源参数的收敛速度和精度.     

Nanoparticle-based lift-off technique for ultra-thin nanoporous film preparation

Ultra-thin membrane with nanoscale through hole has great potential in biomedical applications, where precise controllability of porosity, pore size and film thickness is urgently required. The present work proposed a cost-effective way to prepare the ultra-thin nanoporous film with a promising controllability. Monodispersed nanoparticle, rather than photoresist, is used as the sacrificial material for this new lift-off process. By releasing the particles, holes can be achieved with predeter-mined characters. A 110 nm-thick nanoporous aluminum film with well-controlled pore＇s diameter was successfully fabricated to validate the technique. The technique has wider process window and better applicability than other nanofabrication methods.     

基于投影寻踪的水利工程项目决策模型研究

决策问题是水利工程项目管理过程中的关键问题,由于水利工程项目的独特性,其决策问题受到多方面因素的综合影响,是一个综合评价问题.然而,用于解决水利工程项目决策问题的现有数学模型方法,多数受到人为因素的干扰,存在缺点和不足.因此,在分析现有方法存在问题的基础上,构建了基于投影寻踪的水利工程项目决策模型,并将其应用到一个水利工程项目的经济财务决策问题中.     

TURBULENCE TRANSPORT OF SURFACTANT SOLUTION FLOW DURING DRAG REDUCTION DEGENERATION

Turbulence transport of surfactant solution flow during drag reduction degeneration is investigated experimentally in a two-dimensional channel.Particle Image Velocimetry (P1V) system is used to take t...     

湖南株溪口水电站一期百吨级门机轨道梁吊装技术

本文介绍了一种新的闸坝式水电站坝顶门机轨道梁的施工方案,结合确定的方案着重介绍了轨道梁吊装机具的设计和吊装施工情况。该方案不但成本低而且能够满足质量工期要求,实施后取得了显著的经济效益。     

虚拟战场雷达频率及衰减强度可视化

雷达频率作为虚拟战场雷达作战信息可视化的重要内容,是战场可视化研究的重点。传统的雷达频率表现,主要通过建立光与频率的映射关系,利用颜色来进行表现,这种以光磁物理映射关系的表现方式在大规模虚拟战场表现上容易造成混乱,不利于区分不同类型信息。利用粒子法,将粒子跳动的速率与频率进行关联,在保证物理特性关联度的前提下,解放了颜色表现方式,同时利用射线和透明度法将雷达传播路径和衰减强度信息也进行了表现。