越人——我国古代天生的航海家

<正>公元2500年前的一天,中国大陆东南沿海一隅,一支由楼船、戈船、扁舟、轻舟等混编而成的船队正待启航,或者是一次征服,或者是一次移民,或者仅仅是一次巡游。风和日丽,波澜不兴,但船员们知道看似平静的水域蕴藏着怎样的凶险,不过从他们脸上看不到畏惧,更不会退缩,无数次惊涛骇浪中的体验早已化为一种从容。     

浅谈保修厂厂长工作要点

公交企业的保修厂作为一个独立的工作系统,承担着运营车辆的维修、保养任务,工作头绪多且涉及面宽.保修厂厂长如何做好管理工作,本人结合自己的认识和经验总结工作要点如下,供参考.     

便携式多参数水质监测系统的设计

本文针对海洋环境中的温度、酸碱度、盐度及溶解氧多个参数对象,以STM32F 103 ARM为核心控制器设计了多参数水质监测系统,可以实时的检测四个参数的数值,并通过蓝牙无线传输将数值显示在上位机的L C D上。实验结果证实该设计可以对海洋环境的多参数进行准确、实时、便携的监测。     

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.     

金属切削刀具减摩槽的研究

通过采用磨有减摩槽的车刀进行切削实验,将测得的切削力数据计算３分析得出磨有减摩槽的刀具可降低切削车的数据,并由此分析减摩槽参数与进给量等之间的关系、磨有减摩刀的在具切削深度、大进给量的切削加工方面有明显的降低切削力的效果和实用价值,用于不重磨刀片刀具上具有广阔的前景。     

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。