某游船电力推进系统方案设计

随着电力推进技术的发展,电力推进应用日趋广泛。本文首先概要的介绍了某游船电力推进系统的系统方案,然后针对各分系统设备,如柴油发电机组、主配电板、推进系统、控制系统各种参数确定、选型设计进行了详尽的介绍。     

SiMoCo: the viability of a prototype platform for a coastal monitoring system: a case study

Coastal zones are among the most productive areas in the world, offering a wide variety of valuable habitats and ecosystems services. Despite the low population density in the Brazilian coastal zone, their distribution is quite concentrated near some coastal cities and state capitals. This concentration places enormous pressure on coastal resources. Therefore, the main objective of this paper is to present an overview on the current status of SiMoCo (Sistema de Monitoramento Costeiro, or Coastal Monitoring System in English) project as a possible early warning system that can be integrated to the Brazilian Coastal Management Information System. This prototype platform provides a real-time access to the composition, organization and simulation of planktonic communities. First, our results demonstrate such a system detecting a target dinoflagellate; second, we apply structural and functional indexes to compare and characterize the ecological networks from two different coastal areas. Conclusions are made about SiMoCo’s feasibility and its possible contribution to the decision-making process within integrated coastal zone management (ICZM) strategies.     

The development of a stochastic non-linear and dynamic jack-up design and analysis method

This paper describes the development of a non-linear, dynamic jack-up analysis method in the time domain. It provides background as to why and when such analysis is required.

The theoretical background of the methods applied are discussed and the main features of the programme are described.     

铁路路基动态特性的模型试验研究

本文分析了列车荷载作用下路基的特点，通过１：１的室内模型试验研究了路基的动应力、永久变形、弹性变形和加速度随列车苛功的重复作用次数、轴重及运行速度的变化规律，同时提出了改善路基的动态特性的一些措施。     

天津市道路汽车行驶工况的研究

本文研究了天津市的道路行驶工况,将一套车载实测系统安装在一辆华利牌微型面包车上研究天津,市不同道路的行驶状况。用速度、加速度等行驶特征参数为准则数,对天津市各种道路行驶状况作了详细的描述和分析,得出了一个基于实际汽车速度、加速度等准则数的行驶工况,并做了这个行驶工况和欧洲的ECE15、美国的FTP75和日本的10－15工况的对比。结果表明,天津市有它自己的道路行驶特征：市区平均速度低,怠速时间长,加减速频繁,平均加减速度小。     

Oblique Wave Scattering Problems Involving Vertical Porous Membranes

Oblique surface waves incident on a fixed vertical porous membrane of various geometric configurations is analyzed here. The mixed boundary value problem is mod...     

Geochemical controls on distributions and speciation of As and Hg in sediments along the Gaoping (Kaoping) Estuary–Canyon system off southwestern Taiwan

Surface and box-cored sediments were collected along the Gaoping (formerly spelled Kaoping) Estuary–Canyon system and analyzed for As and Hg contents and speciation, ²¹⁰Pb-based sedimentation rates and various geochemical parameters to elucidate the mechanisms that control natural and anthropogenic inputs of As and Hg from the Gaoping (Kaoping) River (KPR). The contents of As and Hg in surface sediments ranged from 1.84 to 20.7 mg kg^− 1 and from 0.07 to 2.15 mg kg^− 1, respectively, in the estuary and canyon. The concentrations generally decreased from the lower river toward the mixing boundary and then increased toward the estuarine mouth, followed by a slight variation in the canyon. Both As and Hg concentrations correlated strongly with clay, total organic carbon (TOC), Al, Fe and Mn contents in estuarine sediments but not necessary the same cases for canyon surface sediments. The factor analysis of surface sediments shows that the first two factors, which account for 75.6% of the variance, may represent major roles of carriers (clay, Al and Fe–Mn oxides) and TOC in controlling As and Hg distributions, respectively. Accordingly, the spatial patterns of the enrichments of As (1.9–16.2) and Hg (1.8–30.8) with reference to the crust levels follow the individual element's distribution patterns, likely because of deposition variability following inputs from the river. The contents of mobile As and Hg correlated substantially with the contents of both metals that were extracted with 0.1 M HCl. In addition to the major pool in the residual fraction (65–87%), As was relatively abundant in Fe–Mn oxides/hydroxides, whereas Hg was abundant in the organic/sulfide fraction. The deposition and accumulation rates of As and Hg in the canyon clearly decreased as the depth of water increased. The depth distributions of both metals are likely controlled primarily by TOC and Fe–Mn oxides associated factors followed by a contribution from anthropogenic pollution. The metal pollution appears to have increased substantially around 1970, following the economic boom in Taiwan, suggesting that modern sediments in the Gaoping (Kaoping) Canyon were derived from the Gaoping (Kaoping) River (KPR).     

船舶工业轻微事故的主成分分析

主成分分析法是利用降维的思想,在损失很少信息的前提下,把多个指标转化为几个相互独立的综合指标的多元统计方法。将主成分分析用于船舶工业的轻微事故统计中,对事故类型和发生月份进行深入分析,得出事故发生的潜在规律,对制定相应的事故预防策略具有一定的指导作用。     

Investigation on evaluation of yaw stability for medium commercial vehicles

This paper proposes test scenarios for evaluation of yaw stability for medium commercial vehicles. Maneuvering, speed, longitudinal tire force, tire-road friction coefficient, road slope, and load condition are considerable factors that have effect on the medium commercial vehicle yaw stability. After conducting an analysis on these six factors, effective test scenarios were developed. A sine with dwell test is well known as a test scenario for evaluation of performance of electronic stability control (ESC) on passenger vehicles and heavy commercial vehicles. The SWD test was modified considering medium commercial vehicle dynamics, and the ramp steer maneuver with maximum acceleration test was proposed. Simulation validation has been conducted using field test data. From simulation study, it was shown that the ESC system for medium commercial vehicle is effectively evaluated by the proposed test scenarios.