港口与运输方式及陆港联合选择的巢式Logit模型

为刻画托运人对港口、运输方式及陆港的联合选择行为，将港口费用、等待时间、班轮频率、货物价值、单次运量、运输成本、运输及通关时间、准班率、陆港服务作为效用变量，构建港口选择位于上层、运输方式及陆港选择位于下层的巢式Logit模型.基于辽宁部分城市集装箱托运人的RP/SP调查数据，对模型参数进行估计和检验.结果表明，低运量倾向选择公路运输，托运人对多式联运的运输成本、运输及通关时间比公路运输的更重视，对公路运输的准班率比多式联运的更重视，陆港服务对多式联运具有显著正向影响，巢式Logit模型比MNL模型具有更优的统计学特征.     

无人船在港口水域海事监管中的应用探讨

近年来,随着与船舶自主航行相关的信息技术、人工智能技术水平的提高,无人船舶行业取得了长足的发展,其在海上安保、环境监测等领域应用也越来越成熟。为推动无人船在海事管理方面的应用研究,破解港口水域海事监管手段不足的瓶颈问题,文中在分析港口水域海事监管特点和无人船系统建设条件的基础上,定量研究了无人船在港口水域海事监管应用面临的性能指标确定、船型平台选择、载荷设备搭配、运行管理体系建设等方面的具体问题,提出了一种港口水域海事监管无人船系统的应用解决方案。     

The effect of crowding on public transit user travel behavior in a large-scale public transportation system through modeling daily variations

In this paper, the crowding effect in a transit vehicle is modeled in a time-expanded network that considers the daily variation in passenger flows. The study models the daily variation of in-vehicle crowding in a real large-scale transit system. A transit assignment for this real network is modeled and implemented by constructing a crowding cost function that follows the valuation of crowding and by using the reliable shortest path finding method. The direct application of the crowding model to a real network for the Utah Transit Authority indicates that crowd modeling with multi-user classes could influence public transportation system planning and affect the revenues of transit agencies. Moreover, the addition of the disutility factor, crowding, does not always appear to cause an increase in disutility for transit users.     

Labview应用程序开发中使用支持文件相对路径的有关问题

用Labview开发涉及支持文件读写的应用程序时,常会出现调试正常而可执行文件运行时找不到支持文件路径的错误。基于一简单示例,分析了产生此问题的原因并提供了解决问题的思路。     

提高TSP探测精度的途径

TSP作为目前最先进的隧道地质超前预报探测仪器，得到了广泛的应用。但是由于在现实中存在各种问题，从而导致该仪器的预测精度受到了极大限制，主要阐述如何提高其预测精度，更好地为隧道的建设服务。     

高速三体船的研究与发展

对高速三体船的研究进展进行了综述,阐述了高速三体船的应用前景,归纳评述了有关的研究成果和尚存在的问题,并提出了关于这种新船型的若干研究方向。     

Integrated vehicle and powertrain optimization for passenger vehicles with vehicle-infrastructure communication

This research proposes an optimal controller to improve fuel efficiency for a vehicle equipped with automatic transmission traveling on rolling terrain without the presence of a close preceding vehicle. Vehicle acceleration and transmission gear position are optimized simultaneously to achieve a better fuel efficiency. This research leverages the emerging Connected Vehicle technology and utilizes present and future information—such as real-time dynamic speed limit, vehicle speed, location and road topography—as optimization input. The optimal control is obtained using the Relaxed Pontryagin’s Minimum Principle. The benefit of the proposed optimal controller is significant compared to the regular cruise control and other eco-drive systems. It varies with the hill length, grade, and the number of available gear positions. It ranges from an increased fuel saving of 18–28% for vehicles with four-speed transmission and 25–45% for vehicles with six-speed transmission. The computational time for the optimization is 1.0–2.1 s for the four-speed vehicle and 1.8–3.9 s for the six-speed vehicle, given a 50 s optimization time horizon and 0.1 s time step. The proposed controller can potentially be used in real-time.     

船舶运动姿态测量系统设计与实现

为了获取海上航行船舶及自航模试验中船模的姿态参数,设计一种基于MEMS(微机电系统)技术的波高倾斜一体化传感器的船舶运动姿态测量系统.此系统通过MEMS波高传感器对船舶升沉信息进行采集,利用倾角传感器对船舶的纵摇和横摇姿态信息进行采集,采集到的信息经多路A/D转换后送入单片机进行处理,实时得出船舶运动的升沉、纵摇及横摇变化.经处理后的三组数据由船舶运动姿态测量系统通过RS-485串口送到数据接收处理机存储、分析并实时显示船舶运动的姿态变化曲线,该数据接收处理软件采用VC++编写.经过大量试验及海上测试,该系统性能稳定,测量精度高,具有较大的实用价值.     

浅谈软土泥沼地基的处理方法

介绍了软土及泥沼地基处理方法,有换土垫层法、强夯法、侧向约束法、土工织物加固法、排水固结法、综合处理方法的机理和适用范围。     

现代汽车新材料技术应用

材料技术的进步,降低了车辆质量,改善了燃料经济性,并减少了车辆制造成本。近年来,现代汽车普遍采用碳纤维增强材料、陶瓷碳素复合材料以及纳米材料等最新技术,介绍纳米汽油、纳米润滑剂、纳米塑料、碳纳米管、纳米界面材料、新型汽车尾气检测装置等应用于汽车的纳米技术。