抗裂水泥稳定碎石在南京绕越高速东南段中的应用

抗裂水稳嵌挤能力强、整体强度高、收缩系数较小、抗裂性较好,能有效控制裂缝的产生。为解决水稳基层反射裂缝较高的问题,结合绕越高速抗裂型水泥稳定碎石施工,通过强度检验、加强关键的施工环节的控制、优化骨架密实水泥稳定碎石的级配设计等措施,有效降低了裂缝的数量。     

沉船打捞是海事执法中的热点与难点

结合工作实际详细解读沉船打捞工作中的疑难问题,并提出合理建议。     

Fusion of remote sensing images based on nonsubsampled contourlet transform and region segmentation

The purpose of remote sensing images fusion is to produce a fused image that contains more clear, accurate and comprehensive information than any single image. A novel fusion method is proposed in this paper based on nonsubsampled contourlet transform (NSCT) and region segmentation. Firstly, the multispectral image is transformed to intensity-hue-saturation (IHS) system. Secondly, the panchromatic image and the component intensity of the multispectral image are decomposed by NSCT. Then the NSCT coefficients of high and low frequency subbands are fused by different rules, respectively. For the high frequency subbands, the fusion rules are also unalike in the smooth and edge regions. The two regions are segregated in the panchromatic image, and the segmentation is based on particle swarm optimization. Finally, the fusion image can be obtained by performing inverse NSCT and inverse IHS transform. The experimental results are evaluated by both subjective and objective criteria. It is shown that the proposed method can obtain superior results to others.     

Experimental and numerical study of containership responses in severe head seas

An accurate determination of the global load effects in a ship is vital for the design of the vessel. This paper addresses an experimental and numerical study of containership responses in severe head seas. Experimental results were obtained using a flexible model of a containership of newer design. The experiments showed that, taking hull flexibility into account, the fourth and sixth harmonic of the vertical bending moments had a maximum value of between 25% and 50% of the first harmonic. We also demonstrated that hull flexibility can increase the vertical bending moment by up to 35% in sea states relevant for design. Comparisons of moments found experimentally with results from a nonlinear hydroelastic strip theory method showed that the effect of nonlinearities on the rigid body moments was slightly over-predicted in the aft body. The method also tends to over-predict the increase of the bending moments due to hull flexibility. In general however, the numerical results compared reasonably well with the experimental ones.     

道路交通事故紧急救援保障体系与技术支持

我国汽车保有量仅占全球汽车保有量的3%,而每年死于交通事故的人数约占全球死于交通事故人数的15%20%,尤其交通事故致死率是日本等国家的1020倍。本文就此现象进行基本原因的分析,并着重对交通事故紧急救援保障体系与技术支持问题进行探讨。     

Numerical and experimental investigations into the application of response conditioned waves for long-term nonlinear analyses

The coefficient of contribution method, in which the extreme response is determined by considering only the few most important sea states, is an efficient way to do nonlinear long-term load analyses. To furthermore efficiently find the nonlinear short-term probability distributions of the vessel responses in these sea states, response conditioned wave methods can be used. Several researchers have studied the accuracy of response conditioned wave methods for this purpose. However, further investigations are necessary before these can become established tools. In this paper we investigate the accuracy by comparing the short-term probability distributions obtained from random irregular waves with those from response conditioned waves. We furthermore show how response conditioned wave methods can be fitted into a long-term response analysis. The numerical and experimental investigations were performed using a container vessel with a length between perpendiculars of 281 m. Numerical simulations were done with a nonlinear hydroelastic time domain code. Experiments were carried out with a flexible model of the vessel in the towing tank at the Marine Technology Centre in Trondheim. The focus was on the probability distributions of the midship vertical hogging bending moments in the sea states contributing most to the hogging moments with a mean return period of 20 years and 10 000 years. We found that the response conditioned wave methods can very efficiently be used to accurately determine the nonlinear short-term probability distributions for rigid hulls, but either accuracy or efficiency is to a large effect lost for flexible hulls, when slamming induced whipping responses are accounted for.     

船舶燃用低硫燃油的问题分析与系统设计

随着人类对环境保护的日益重视及规范规则的强制执行,要求越来越多的船舶在规定的区域内使用含硫量不大于0.1%m/m的低硫油。介绍了国际海事组织和各船级社对船舶柴油机排放物中含有硫氧化物的规定,并举例对船舶燃油系统的设计作一介绍。     

探索人力资源管理方式造就船舶设计优秀人才

0前言 高水平的人才队伍是市场竞争中不断取胜的法宝,是经济发展中不断攀高的源泉.上海船舶研究设计院(简称"船院")45年的发展历程证明:贯彻"以人为本"的指导思想.是实现船院科学发展的根本保障.为了构建有利于船院科学发展的内部机制.必须把握人力资源管理的发展规律、丰富人力资源管理的内涵和转变人力资源管理的方式.     

主动声纳的低截获性数字仿真研究

在现代海战中,舰艇面临着越来越严峻的敌方侦察声纳的威胁.低截获是一项非常诱人的技术.低截获声纳通过选择合适的发射信号,在保持探测能力的同时,降低被敌方侦察声纳截获的概率.采用数字仿真的形式,分析浅海侦察声纳信号能量的变化,研究主动声纳的低截获性.仿真结果表明在高斯噪声背景下,主动声纳实现低截获性相当困难.     

Robot算法分析

介绍Robot搜索算法与启发式搜索算法,比较分析Robot广度优先策略,深度优先策略以及广度、深度结合策略,探讨Robot优化策略.