潜艇声隐身态势评估方法研究

给出了一套评估潜艇声隐身态势的方法,其中包括两个指标--声隐身安全半径和被探测概率,用以评估潜艇的声隐身态势.将潜艇宽带噪声和窄带噪声分开考虑,分别研究两种噪声下潜艇声隐身安全半径的算法,并分析了对其的影响因素.     

THE ROLE OF RED NUCLEUS IN THE MODULATION OF SPINAL NOCICEPTIVE TRANSMISSION AND IN NOCICEPTION ELICITED BY MUSCLE SPINDLE AFFERENTS

RNiswellknownasanimportantnucleusinmotorcontrolofextra pyramidalsystem .However ,anatomicalstudieshaverevealedthatasignificantproportionoftherubrospinalfibersterminatesintheventralportionofthedorsalhorn (laminaeⅤ Ⅵ ) ,andinpartoftheintermediatehorn (laminaeⅦ ) .Suchterminaldistributionsuggestthatrubro spinalneuronsmaymodulatetheresponsesofdorsalhornneuronsinvolvedintherelayofsomatosensorycutaneousinformationtomorerostrallevelsofner voussystem .ThereareevidencesthatRNstimula tionaffectsnoc…     

集中操控系统的设计与实现

对集中操控系统的功能含义、设计方案进行详细描述,并具体阐述集中操控系统的功能特点和应用实现。     

Electric vehicles in multi-vehicle households

The suitability of an electric vehicle of a given range to serve in place of a given conventional vehicle is not limited by the daily travel over distances within that that range, but rather by the occasional inconvenience of finding alternative transport for longer trips. While the frequency of this inconvenience can be computed from usage data, the willingness of individual users to accept that replacement depends on details of available transportation alternatives and their willingness to use them. The latter can be difficult to assess. Fortunately, 65% of US households have access to the most convenient alternative possible: a second car. In this paper we describe an analysis of prospective EV acceptance and travel electrification in two-car households in the Puget Sound region. We find that EVs with 60 miles of useful range could be acceptable (i.e. incur inconvenience no more than three days each year) to nearly 90% of two-car households and electrify nearly 55% of travel in those households (32% of all travel). This compares to 120 miles range required to achieve the same fraction of electrified travel via one-for-one replacement of individual vehicles. Even though only one third of personal vehicles in the US may be replaced in this paradigm, the ‘EV as a second-car’ concept is attractive in that a significant fraction of travel can be electrified by vehicles with modest electric range and virtually no dependence on public charging infrastructure.     

交通运输行业新能源汽车推广应用现状研究

近年来,在国家新能源汽车产业的战略引导下,我国新能源汽车产业加速发展,新能源汽车技术也得到了不断提高。本文对目前新能源道路运输车辆在交通运输行业中应用面临的问题进行了深入剖析,并从战略规划、车辆选型、车辆管理等方面,对完善交通运输行业新能源汽车应用的环境提出了意见和建议,为进一步保障新能源汽车安全运行、科学发展提供了有力支持。     

高陡边坡桥基安全距离研究

研究目的:高陡边坡桥基位置的确定不仅关系到高边坡的稳定和桥梁的安全,也直接关系到整个桥梁的技术指标和造价。而目前相应的规范及手册中,对高陡边坡桥基位置没有明确的规定。研究方法:荷载作用下高陡边坡岩体力学行为特征是桥基位置确定的基础。利用数值分析方法,分析不同边坡几何状态下荷载对边坡岩体应力的影响。研究结果:根据荷载作用下边坡岩体应力影响范围的变化特征,提出高陡边坡桥基安全距离的确定原则。边坡岩体应力影响范围主要与荷载强度、桥基宽度、边坡坡度以及桥基水平距离等因素有关。根据坡面岩体应力影响系数最大值与各影响因素的关系,再利用岩体质量对应力影响系数进行限定,提出高陡边坡桥基安全距离的确定公式。研究结论:工程实践表明,用本文方法来确定高陡边坡桥基位置是方便的、适用的。     

CA6127URE31纯电动客车总体设计

简要介绍CA6127URE31纯电动客车的整车技术参数、纯电动系统的技术方案、内饰技术方案以及整车动力电池组布置技术方案。     

基于市场化的高速公路日常养护合同发包范围探讨

为使高速公路运营管理者对于高速公路日常养护市场化发包的合同管理内容更加明确,提出了一种高速公路日常养护市场化发包范围的方案,这有助于使高速公路日常养护的市场化管理更加合理,同时减小运营管理者的养护管理难度.     

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为了定量反映民机"座级"、"设计航程"与直接运行成本之间的内在关联性,利用NASA 97方法为各种样本机型在不同的长短结合的"飞行航距"下生成直接运行成本样本点,确定"型别等级"民机市场直接运行成本与"飞行航距"的函数形式并计算回归系数的估计量,以此分析"座级"、"设计航程"与各个回归系数估计量之间的函数关系,给出"型别等级"民机市场DOC的计算模型函数,通过OLS方法估算模型的回归系数.通过与NASA 97方法对4种样本机型产生的10个样本点的比较,发现模型计算的最大相对误差为0.086,因此模型可行.     

舰载雷达对大气波导效应的利用

介绍电磁波在大气中传播的一种异常现象--"大气波导"现象,论述了大气波导形成的气象条件,以及形成波导传播的电磁波的最大陷获波长和临界发射仰角,同时论述了电磁波受大气波导影响能够增大舰载雷达的探测距离,实现舰载雷达的超视距探测及军事应用意义.