Development of port service network in OBOR via capacity sharing: an idea from Zhejiang province in China

The ‘Silk Road Economic Belt and the 21st-Century Maritime Silk Road’ (One Belt One Road, OBOR) strategy initiated by the Chinese government has a significant impact on the business and logistics modes which involves Asia, Europe, Africa, and their adjacent seas. Many countries and ports are developing new strategies that are suitable for this economic environment. Compared with many ports in the world, the ports in Zhejiang province of China have a novel property. In addition to Ningbo-Zhoushan port, there are several other sea ports and river ports in that province. In this paper, we propose a concept of port service network that consists of a huge hub and multiple ports. Ports of small and medium sizes can share their capacities of different types of port service with the hub when the service capacities are integrated into the network. We develop a mixed integer nonlinear programming model to determine the optimal decisions in such a network with constraints on the budget to conduct integration. An optimization algorithm incorporated with a genetic algorithm is developed to solve large size problems. We provide managerial insights on the policies of government, including expanding port capacity, reducing fixed integration cost, and providing better financial condition.     

Evaluation of transit proximity effects on residential land prices: an empirical study in Austin,Texas

The Austin MetroRail line in Texas, U.S.A. began operations in 2010 and since then transit-oriented development projects have been fuelled around train stations. Traditional location theory holds that proximity to a transit station should be capitalized into land prices, and numerous empirical studies have demonstrated the effects with mixed results. However, to date no empirical study has investigated this relationship between the newly built rail line and land prices in Austin. This study fills the research gap and suggests a positive effect associated with transit proximity by employing spatial hedonic models. This study also contributes to the existing literature especially in the context of Texas cities where there is a lack of relevant research on transit-capitalization-related topics, and provides insights for decision-makers with different perspectives regarding further rail investment or transportation financing strategies such as value capture programs.     

An integrated GPS/DR navigation system for AUV

GPS/Dead-reckoning navigation system for autonomous underwater vehicle （AUV） is introduced, which includes navigation overall architecture, hardware and software structure. Dead-reckoning theory is presented in details. And the strong tracking Kalman filter and Singer model are applied to handle the imprecise navigation mode, which can improve the navigation system＇s precision and reliability. Finally, the sea experiments which include autonomous search mission in an unknown area and long distance motion are conducted to demonstrate the reliability and feasibility of the navigation system.     

军民兼容卫导终端中基带处理影响分析

在军民兼容GPS接收机中,A／D采样速率取决于军码带宽,民用要求需进行抽取,以有效地节省硬件资源。对此着重分析推导了均匀量化对信噪比的影响、有效字长截取对载噪比和正交性能的影响,并给出了最佳截取方案。GPS卫星信号的实际接收机情况,表明结论正确,能在基本不改变接收机性能的情况下有效地节约硬件资源。     

基于Web的机舱远程监控系统设计

使用基于Web的监控技术实现机舱设备的远程监控与管理是当前船舶自动化发展的趋势。本文把基于Web的网络技术应用到船舶机舱设备远程监控和故障诊断领域,提出了利用LabVIEW的Web发布工具实现远程监控的系统方案,给出了该系统的基本结构、功能、硬件组成和利用LabVIEW实现Web发布的具体方法。远程用户通过Web浏览器可对现场监控机发出监控指令,获取机舱设备的状态参数。当出现异常数据本船无法判别时,可通过远程故障诊断系统进行在线诊断。     

弹塑性固有应变法在厚壁球面舱壁结构焊接中的应用

针对热弹塑性有限元法仅适用小规模焊接的弊端,采用弹塑性固有应变法对厚壁球面舱壁结构的焊接工艺进行模拟,并对球面舱壁结构的焊接工艺进行优化,最终给出球面舱壁结构合理的焊接工艺.在大型有限元软件ANSYS的基础上,通过开发的热弹塑性焊接计算程序得到单道焊缝焊接时的残余应变;通过残余应变等效,对球面舱壁的各焊缝处施加温度载荷;通过一次弹塑性有限元法得到厚壁球面舱壁结构的整体变形.通过开展不同焊接工艺下球面舱壁结构的焊接变形分析,给出厚壁球面舱壁结构合理的焊接工艺.     

海洋空间智能无人运载器技术发展展望

海洋空间智能无人运载器是指：智能水面无人艇（USV）、智能水下机器人（AUV）和无人水下机器人（UUV）。随着无人飞机、无人战车、机器战士逐渐在战场上显示越来越大的威力，无人化战争的发展已经呈现出相对清晰的蓝图。海洋空间智能无人运载器也得到迅速的发展，它们在未来海洋国土安全、海洋开发方面发挥越来越大的作用。国内外都十分重视该领域的研究，已取得多项鼓舞人心的成果，并逐渐在军事和其他方面得到应用。概要介绍无人运载器的发展趋势。     

桩-网复合地基加固机理现场试验研究

通过在广东某环城高速公路深厚软土地基加固工程中设置桩—网复合地基试验段,研究路堤荷载下桩—网复合地基的工作机理,深入分析其沉降变形、荷载传递、桩土应力比、网的受力等性状。试验成果表明：桩—网复合地基可以有效减少沉降量,可以用于填土高、软土厚度大的路段;路堤荷载下管桩与桩间土沉降不协调,土工格栅调节桩土分荷比的作用非常明显;长桩区格栅上、下的桩土应力比相差较大,桩土应力比最大值接近80;未达到持力层上的短桩桩土应力在14-22之间比较小,格栅兜提作用随桩土沉降差增大而得到发挥;在传递荷载方面,格栅作用要强于土拱的作用,满载时各向桩顶传递30%左右的荷载,土工格栅应变最大仅为1%,且桩帽边缘处应变最大,桩间应变最小。     

大青叶淫羊藿中微量锰在兔血中药代动力学的研究

以催化动力学分析法为监测手段,利用二价锰离子对高碘酸钾——罗丹明B反应体系的催化作用,使用邻菲罗啉为活化剂,对兔血中微量锰进行了荧光测定,绘制了药时曲线,结果经微机处理,得到系列药代动力学参数。     

殷人渡美——三千年前“或许有”的航海传奇？

我国的航海历史极为悠久,远古航海文明萌芽的产生可以追溯至遥远的新石器时代。在搏击风浪、走向海洋的漫长岁月中,勇敢的中华民族创造了辉煌的航海业绩,涌现了众多灿若星辰的航海人物,书写了一个个让人魂牵梦萦的航海传奇。