泸溪沅水大桥主桥连续箱梁挂篮悬浇施工介绍

结合泸溪沅水大桥施工工程实例,介绍了挂篮施工方案,技术要点及注意事项等。     

我省高速公路养护机械化的现状与发展

本文文对我省高速公路养护机械化的基本现状作了全面介绍,提出了养护机械化的发展方向,并以此为目标,对养护机械化的发展进程进行了科学规划。     

Automatic outer surface extraction of femoral head in CT images

Computer-aided hip surgery planning and implant design applications require accurate segmentation of femoral head and proximal acetabulum. An accurate outer surface extraction of femoral head using marching cubes algorithm remains challenging due to deformed shapes and extremely narrow inter-bone regions. In this paper, we present an automatic and fast approach for segmentation of femoral head and proximal acetabulum which leads to accurate and compact representation of femoral head using marching cubes algorithm. At first, valley-emphasized images are constructed from original images so that valleys stand out in high relief. Otsu’s multiple thresholding technique is applied to seperate the images into bone and non-bone classes. Region growing method and threedimensional (3D) morphological operations are performed to fill holes in the bone. In the reclassification process, the bone regions are further segmented, and the boundaries of the bone regions are further refined based on Bayes decision rule. Finally, marching cubes algorithm is applied to reconstruct a 3D model and extract the outer surface of femoral head and proximal acetabulum. Experimental results show that this method is an accurate segmentation technique for femoral head and proximal acetabulum and it can be applied as a tool in medical practice.     

中国共产党思想政治工作的历史经验与时代选择

思想政治工作是我们党的优良传统和政治优势,他为中国社会革命和社会建设运动提供了科学的思想指南,做出了重要的贡献.认真总结我们党思想政治工作的历史经验,对我们有效开展新时期思想政治工作,为建设中国特色社会主义提供强大的精神动力,创造良好的外部环境,有着重要的现实指导意义和深远的历史借鉴意义.     

基于标记点法(MAC)的散货船舱室晃荡强度分析

简要介绍了液舱晃荡分析的几种方法及优缺点.根据散货船舱室液舱晃荡强度分析的特点,基于标记点法(MAC)的基本原理,介绍了一种快捷、有效、实用的舱室二维晃荡分析方法,并以部分装载压载水的货舱为例,对舱壁构件的晃荡强度进行了评估.     

Numerical Investigations on the Aerodynamic Performance of Wind Turbine：Downwind Versus Upwind Configuration

Although the upwind configuration is more popular in the field of wind energy, the downwind one is a promising type for the offshore wind energy due to its special advantages. Different configurations ...     

基于物元分析法的公路桥梁损伤等级评定研究

在构建桥梁损伤等级评定指标体系的基础上,采用 AHP确定了各指标的权重,运用物元分析的方法建立了桥梁损伤等级评定的数学模型,并利用模型评定结果,得到了某桥梁的损伤等级。     

基于模糊集对分析的船舶能耗评估

针对船舶能耗评价中影响因素具有模糊性、不确定性和关联性等特点,在确定船舶能耗评价因素集的基础上,利用模糊集对分析方法将待评估船舶的能耗情况与理想情况组成一对集对,计算各级评价指标的同一度、对立度和差异度得到集对联系度。根据船舶能耗系统的联系度进行同异反态势评判,贴近度和不确定性分析,从而得到船舶能耗系统的综合评估。实例分析验证了将模糊集对分析应用于船舶能耗评估的有效性。     

轨道交通综合监控系统调度管理应用

轨道交通综合监控系统通过统一的平台将各子系统有机地结合,实现数据的共享和统一管理.通过对不同集成方式的分析,结合某城市轨道交通实例,简谈综合监控系统调度管理应用.     

基于动态规划的多目标的TBD算法

在弱目标检测领域中,动态规划法是一种有效的能量积累方法。文章针对低信噪比下的多目标检测问题,提出了一种基于动态规划的多目标检测前跟踪算法。该算法能够较有效地估计搜索空间中的目标个数,也能分离出每个目标的航迹。