Patterns in diversity and community structure of epipelagic copepods from the Brazil–Malvinas Confluence area, south-western Atlantic

Diversity and structure of epipelagic copepod communities were investigated using 70 zooplankton samples collected from the top 50 m of the Brazil–Malvinas Confluence area between 35° and 55°S. Biogeographic patterns were investigated using multivariate analysis. Biodiversity patterns were examined using different univariate indexes. Representatives of 35 species of copepods from 23 genera and 13 families were found. Two zones were delimited based on their copepod composition, one in the subtropical waters of the Brazil current, and the other in the subantarctic waters of the Malvinas current. Both environments displayed contrasting patterns of biodiversity depending upon which element is measured (regional species richness as well as mean point species richness were significantly higher in the subtropical group of stations, whereas taxonomic distinctness was significantly higher in the subantarctic community). Based on these contrasting results, we suggest the use of both kind of indexes when defining priority areas for conservation.     

基于Matlab的船舶静水力性能数值计算

本文提出一种基于Matlab的船舶静水力性能数值计算方法，该方法完全独立于传统的表格算法，方便快捷，精确度高。     

Young drivers and graduated licensing: The Ontario case

Despite improvements in road safety over the past several decades, accident rates remain high for young drivers. One accident countermeasure that is expected to improve the safety record of this group is graduated licensing. The philosophy behind this licensing system is that novice drivers, of whom the majority are young, should be restricted to relatively safe driving environments during the initial learning period. Graduated licensing was implemented in the Province of Ontario, Canada in 1994. The objective of this study is to estimate the potential benefits and costs for young drivers associated with two components of the Ontario graduated licensing package: the late-night driving curfew and the high-speed roadway restrictions. Based on accident and travel data for the year 1988, accident-involvement rates per kilometre driven were calculated for different driver groups for various combinations of time of day and roadway speed limit. These rates were then applied to the expected mobility profiles of young drivers affected by graduated licensing. The results of the study support the late-night curfew and suggest that this component of the licensing package should reduce total accident involvements for the affected group by up to 10 percent and fatal accident involvements by up to 24 percent, while reducing their total driving by only four percent. By contrast, the empirical evidence suggest that the high-speed roadway restrictions are likely to increase accident involvements, and thus it is strongly recommended that this component of Ontario's graduated licensing package be changed.     

控制和管理一体化的DCS系统

阐述工业控制和管理一体化ＤＣＳ系统的重要性，介绍了一种网桥，将２＋控制网和ＮＯＶＥＬＬ网连网，并给出了具体的系统图和接口电路图。     

村通工程交换网网管改造方案

从村通工程的实际背景出发，立足于甘肃省本地电话网的现状，结合目前本地电话网组建方案的利弊及其发展进程进行分析，得出了一个扩大本地网网管系统的方案。     

TECCO型主动防护系统在丹庄高速公路边坡防护中的应用

阐述TECCO型主动防护系统组成及防护机理,并介绍其在丹庄高速公路边坡防护工程中的施工方法及工艺。     

计算机技术在测量仪器中的应用

1 智能仪器的简介 　　随着微电子技术的不断发展,微处理器芯片的集成度越来越高.以单片机为主体,取代传统仪器仪表的常规测量电子线路,可以容易地将计算机技术与测量控制技术结合在一起,组成新一代的“智能化测量控制系统“.……     

丰田A650自动变速器故障诊断方法

A650E型自动变速器是具有420N．m传矩能力的五挡自动变速器。论述了该自动变速器故障及诊断方法。介绍了排除一辆装备A650E自动变速器的凌志（LEXUS）GS300轿车冷车行驶基本正常、热车起步困难的故障实例。     

集成电路在线功能测试技术研究

提出集成电路在线功能测试中存在的一些问题并给出了相应的技术解决方案,其中包含了模拟集成电路数字化技术、分时分模块测试技术、隔离技术。这些技术涉及到测试程序的改进技术以及被测对象的特殊处理技术。     

船舶电站控制系统中的数据融合技术探讨

船舶电站是船舶电力系统的重要组成部分。随着电力电子设备在船舶中的大量应用,非线性负载的增多,对船舶电站控制的可靠性及故障预防提出了更高的要求。多传感器数据融合技术是近年发展起来的一门新兴技术,文章根据多传感器数据融合技术的基本思想,采用扩张的卡尔曼滤波法对电站参数进行冗余数据融合,在船舶电站控制的实时性和可靠性方面取得了较好的效果。