车路协同下浓雾天气对高速公路换道行为的影响分析

为探究车路协同下浓雾天气对驾驶员在高速公路换道行为的影响,依托驾驶模拟实验平台设计车路协同人机交互终端(human-machine interface, HMI),设置对照组、正常天气+HMI组、浓雾天气组和浓雾天气+HMI组4种实验场景,招募43名被试进行驾驶模拟实验,采集换道行为数据。从中提取换道过程,将其划分为换道决策与换道执行两个阶段,选取方向盘转角、横向加速度以及横向偏移量的变化幅度与方差表征换道决策阶段的行为特征;选取换道轨迹长度、换道时间、换道平均车速与横向加速度峰值刻画换道执行阶段的行为特征,最后采用广义线性模型对所选变量进行分析。结果表明：浓雾天气、HMI以及两者的交互效应均对驾驶员的换道行为存在显著影响。在换道决策阶段,浓雾天气导致横向加速度以及横向偏移量的变化幅度与方差显著减小(P<0.05);HMI导致方向盘转角、横向加速度等变量显著减小(P<0.05);但两者的交互效应导致各变量(除横向加速度的变化幅度)显著增大(P<0.05)。在换道执行阶段,浓雾天气导致换道轨迹长度(P=0.01)和换道平均车速(P=0.00)显著减小,HMI仅对横向加速...     

基于π演算的攻击编队组织的动态演化

根据空战作战任务的特点，对协同攻击任务进行阶段分解和类型分解。建立了基于任务、面向结构、具有集中．分布式指挥控制关系的作战编队组织结构。应用π演算对编队成正的任务角色的指派、维持、更改和角色冲突协调等编队组织动态演化问题进行了研究，使编队成员任务角色可根据空战态势、空战任务和编队成员的生存力等进行及时调整，确保编队有效的实施对目标的协同攻击。     

Olfactory navigation in birds

Summary Many bird species rely on an osmotactic mechanism to find food sources even at a considerable distance. Pigeons also rely on local odours for homeward orientation, and they integrate those perceived during passive transportation with those at the release site. It is possible to design experiments in which birds are given false olfactory information, and predictions about the effects of this can be made and tested. Pigeons build up their olfactory map by associating wind-borne odours with the directions from which they come; this was shown by experiments which aimed at preventing, limiting or altering this association. Some objections have been made to this conclusion; namely that even anosmic pigeons are sometimes homeward oriented, that they may be demotivated in flying or disturbed in their general behaviour, and that olfactory cues may be only one component of pigeo's navigational repertoire. The most recent experiments, however, confirm that pigeons derive directional information from atmospheric odouts. The lack of any knowledge about the chemical nature and distribution of the odorants which allow pigeons to navigate hinders progress in this area of research.     

On Incentive Equlibria for Dynamic Games

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美国赠地院校农业合作推广服务概况

美国赠地院校通过农业合作推广制度．显著地促进了美国农业现代化．其理念、内容、方式、组织管理、教育资源开发等方面经验，值得我国科教兴农借鉴．     

合作经济组织——我国农村经济组织的一种新选择

罗虚代尔合作原则几乎是合作经济的代名词。我国农村体制改革以家庭联产承包责任制为突破口，取得了举世瞩目的巨大成就。一项制度性的安排随着时代和环境条件的改变，应该与世俱进。我国入世以来传统的家庭为核心的作业模式在农业产业化进程中，暴露出种种弊端。合作经济是市场经济发展的必然产物，借鉴发达国家的成功经验，探索建立适合我国国情的农村合作经济组织是入世后农业产业化进程中的重要课题。农村经济合作化的发展道路是我国农村经济体制创新的必然选择。     

支持多群体同步协同的工作流若干关键技术研究

近年来人们已开始重视同步的工作流研究，但对多个群体同时同步协同的研究还不多见。本文的背景是软件开发，它的过程中往往会出现多个群体同时进行同步协同的情况。为了更好的支持软件开发，本文在工作流中引入了四种新的群体协同型活动节点，提出一种企业组织模型，另外本文还提出一种多个群体同步协同工作时成员的冲突检测算法，从而能够较方便地实现含有一个或多个群体同步协同工作的工作流管理系统。     

网络教学讨论区的构建

教学讨论区以合作学习的方式，采用ASP编程，运用ACCESS数据库系统构建，支持学习过程中学习之间、学生与教师之间的交流与合作。     

捷联惯导系统仿真器设计

本文介绍捷联惯导系统仿真器的设计方案。仿真器包括四个模块：飞行轨迹发生器，惯性敏感元件仿真器，故障发生器，导航计算器。该仿真器分别用Ｃ语言及ＦＯＲＴＲＡＮ语言在微机上实现。     

Synthesis of L-cystine bridged bis(p-cyclodextrin) and its cooperative binding toward guest molecules

A novel p-cyclodextrin derivative, L-cystine bridged bis(β-cyclodextrin) 1 has been synthesized and characterized by 1H NMR, 13C NMR, IR, Raman and combustion analyses. Spectrofluorometric titrations have been performed in aqueous phosphate buffer solution (pH=7.20) at 25℃ to give the complex stability constants (Ks) and Gibbs free energy changes (-△G°) for the stoichiometric 1 : 1 inclusion complexation of 1 with four dyes. The binding abilities and molecular selectivities are discussed from the viewpoint of size/shape-fit and electrostatic interactions between hosts and guests. 2D ROESY investigation for the complexation between host and guest further confirms the cooperative binding of bridged cyclodextrin 1 with guest.