基于LBS的高速路网车辆行驶轨迹监控系统设计

针对目前高速公路联网收费存在的路径二义性、偷逃费、紧急救援问题,提出了基于LBS技术,对高速路网车辆行驶轨迹进行监控的解决思路。设计了系统架构和系统工作流程;分析了系统特点及关键技术;最后通过测试,实现了系统监控功能。     

真空密封法测定沥青混合料毛体积相对密度试验

使用真空密封法,测定了不同碾压次数成型试件的毛体积相对密度,探讨了测定时产生误差的原因;与传统表干法以及蜡封法测定的结果进行对比分析。结果表明:真空密封状态与密封袋的材质是影响试验误差的主要因素;使用真空密封法测定的结果重复性较好,其测定值与表干法以及蜡封法测定值间有良好的线性关系,但测定值间存在显著性差异。     

粉粒物料罐车的型谱分析

经过整理将粉粒物料罐车罐型汇总成表,通过图表的形式展现粉粒物料罐车发展过程,并且提出一个基于罐体受力分析的分类方式。     

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行人流特性分析及仿真模型参数标定目的在于为行人流仿真工作提供理论依据和基础数据。对国内综合交通客运枢纽——北京西直门地铁站行人流数据进行视频采集,采用统计分析软件SPSS对行人流参数数据进行筛选及拟合分析,建立了不同设施的行人流参数关系曲线及函数模型,研究结果表明,水平通道处行人流量与密度呈二次函数关系、流量与空间在某一临界点两侧分别呈二次函数及对数函数关系、速度与密度呈线性关系,楼梯处与之相似但特征点数值存在差异。在此基础上对社会力模型参数进行标定,给出了行人椭圆的长半轴的范围,并引入时间紧迫程度这一影响因子,确定期望速度为速度—密度函数与该影响因子的乘积。     

传统集装箱码头向自动化码头改造仿真分析

以国内某传统集装箱码头为例,提出2种向自动化码头改造升级的码头布局及装卸工艺,并通过仿真软件WITNESS进行仿真建模,输出仿真数据。根据仿真数据,对码头水平运输设备的数量配比进行仿真分析,并从堆场年通过能力、堆场作业能力、码头管理以及能耗成本4个方面对提出的两种工艺进行评估,选出一种较优工艺。     

Are the innovation processes in seaport terminal operations successful?

The maritime and port sector is widely considered conservative concerning the ability to introduce innovation in respect to other industries. This may be due to the lack of cooperative interactions among the several players involved. It does not mean that innovation does not occur in this industry. Along with some technical innovations, managerial, organizational, and cultural innovations also take place in the sector. The literature has considered the assessment and effects of the adoption of particular innovation, but still few studies underline the innovation path in a broad sense with a specific focus on terminal operators. The present article aims at filling this gap through a field analysis grouping together case studies developed in different world regions and examining the adoption path of innovation through a mix of three different techniques (i.e. the H- and I-indexes, a Systems of Innovation Analysis, and a Qualitative Comparative Analysis). Research outcomes underline how, even if no unique recipe for success can be found, specific factors (e.g. a ranking of innovation objectives, coordination among actors, and institutions) can influence the achievement of success. The analyses allow suggesting strategic and policy advice that may help link in a better way the innovation drivers with their actual effects.     

液化天然气码头消防技术

针对国内液化天然气(LNG)接收站和码头消防设施现状,以及现行规范在实施过程中存在的问题,通过归纳和总结LNG码头消防设施常规设计参数,对LNG码头消防设计涉及的关键问题,如消防用水量、消防设施控制、干粉炮安装位置、码头消火栓安装要求、工艺操作平台前沿水幕设置、消防炮塔保护水幕火灾延续时间等方面,进行全面的分析论述,提出解决方法和建议,可为今后LNG码头消防设计和相关规范修订提供借鉴参考。     

墨西哥曼萨尼约CMSA集装箱码头设计

曼萨尼约CMSA集装箱码头工程规模大、功能全、标准高。工程处于墨西哥西海岸强震区,后方紧邻红树林保护区和旅游区海滩。针对上述特点,围绕总体布局、结构抗震、环境保护等关键技术进行研究。按照国际设计标准和港区分期滚动开发思路,码头结构设计采用"弱柱强梁"理念,并埋设大断面过水生态箱涵保护环境。     

Dynamics and interactions between spot and forward freights in the dry bulk shipping market

Analyzing the interactions between spot and forward freight agreement (FFA) prices in the dry bulk shipping is important as they play a significant role for shipping companies to secure their profits and avoid potential risks in the volatile market. By applying the vector autoregression (VAR) and the vector error correction model (VECM), this paper identifies the long-run and mutual causal relationship between the spot and FFA prices on the BPI T/C and BCI C7 routes. Along with these cointegrating rates, exogenous factors such as the market demand and supply and some economic indices are also recognized as contributing variables for the dynamic movement of the spot and FFA prices. Importantly, the mean-reverting process is justified on both routes with different mechanisms. When the spot and FFA prices deviate from their equilibrium level in the short run, they will be adjusted to their long-run equilibrium more directly and clearly on the BPI T/C route than those on the BCI C7 route. It also indicates that this adjusting power has direction and size asymmetries on both routes. In addition, the impulse analysis indicates that the spot rate is more volatile than its corresponding FFA prices confronting innovations. The results of this study provide a reference to the participants in the dry bulk shipping market on the causes of fluctuation in spot and FFA prices and their interactions, which can be used to promote the risk management in the market.