考评式结社与清代小说

考评式结社是宋末元初文人在特殊的历史背景和社会环境下形成的重要沟通方式,并发展成为清代最流行的结社风气.这种结社以考评竞技为主,借鉴科举考试的程序与方法,因而在组织形式等方面不同于一般诗文社.清代的许多小说都提到了考评式结社,但小说家却描绘了与现实不同的特点,即将女性变成结社的主角,客观上反映了清代女子结社的状况.     

半刚接钢框架系统的强刚度耦合可靠性分析

将结构系统强刚度耦合失效模式用并联系统模拟,采用逐步等效线性化方法,基于强度主要失效模式计算在单元截面相继失效历程中的强度和刚度失效模式之间的相关性及其交集失效概率.通过算例对比分析半刚接与刚接钢框架同一失效历程的失效概率,结果表明半刚性连接相对增大了结构系统强刚度耦合失效概率,使其成为主要失效模式.因此半刚接钢框架考虑强刚度失效模式更符合实际情况.     

Rural school transportation in emerging countries: The Brazilian case

The lack of proper policies for the rural environment, in contrast to the situation in the urban environment in Brazil, has prevented the rural population from benefiting from basic infrastructure and access to their rights as citizens. The poor school transportation conditions are large barriers to access and retention of pupils in schools. These poor conditions, with lack of comfort and high accident risks, result in long travelling hours to reach the school and lessen learning performance because the children arrive in the school tired and sleepy. The Brazilian Federal Government has adopted different programs and actions in order to overcome these difficulties and to improve school conditions in general. A new standard vehicle has been adopted, which will be fit for the harsh road conditions in the rural areas, and handbooks have been introduced to help the municipalities and their officials to plan and to contract school transport services. This paper provides an overview of the outlook for rural school transportation in Brazil, describing the operational conditions (including trip and vehicle conditions) and their users, as well as analysis on the effects on school performance, and also the role of the local and Federal governments.     

基于支持向量机的车辆驾驶行为识别研究

从车辆行驶轨迹的角度,车辆驾驶行为可细分为车辆跟驰行为、车辆换道准备行为和车辆换道执行行为,它们对交通拥堵、交通事故等都有着重要影响,也是自动驾驶、交通仿真等系统的基础构成模块.然而,如何从实际微观交通流数据中对3种行为进行识别是驾驶行为研究的基础和难点.本文提出基于支持向量机的驾驶行为识别方法,使用真实车辆轨迹数据,为提高模型的准确率,首先对样本数据进行归一化和主成分分析预处理,然后采用网格搜索算法对惩罚因子和核参数进行寻优,最后利用样本数据对基于支持向量机的分类模型进行训练和测试.结果表明,模型的测试精度达到了98.41%,能够很好地识别车辆的行驶状态,为驾驶行为各阶段的研究提供支持.     

利用阀调节控制管道加油系统的水击压力

将阀调节基本原理应用于机场管道加油系统中,采用特征线法模拟了管道加油系统内阀门关闭的水力瞬变过程,结合工程实际提出了两种可行的阀调节防护措施;通过实例说明阀调节可以优化阀门的动作规律,显著降低加油系统管道中的水击压力。     

Outsourcing rural school transportation: A Brazilian handbook for practice at the municipal level

In Brazil, Rural School Transportation (RST) falls under the responsibility of state and municipal governments. However, there are no clear rules to guide the provision of this essential service. RST in Brazil is characterised by inefficient contracting practices, poor service control by school administration, and lack of legal instruments to penalise poor services, thus allowing operators to run services according to their own commercial criteria. In addition, payment is low, leading to the employment of old vehicles, lack of safety equipment, and non-convenient routes, among other aspects. As a result, school children provided with this service are subject to long travel time over large distances, and irregular and late services, coupled with poorly maintained roads. When children finally arrive at school they are tired, which often negatively affects their school performance and attendance, contributing to early school drop-out. In order to contribute to the improvement of school transportation quality, state and municipal authorities must develop the required organisational, planning, and regulatory skills. Accordingly, this article addresses the elements and the structure of a handbook that is being elaborated for local governments.     

直螺纹灌浆套筒钢筋连接技术的试验与应用

针对码头工程中钢筋连接采用焊接、机械连接功效慢的问题,本文研究灌浆直螺纹套筒钢筋连接技术,通过室内拉伸试验,对比不同套筒长度的钢筋锚固系统破坏强度。结果表明：套筒长度与钢筋直径之比大于等于8且锚固系统破坏时,钢筋应力可达360 MPa以上;套筒可根据钢筋的设计拉力和灌浆材料的剪切强度确定。通过工程检验,采用直螺纹套筒灌浆技术可满足码头工程使用要求,提高钢筋连接效率,降低施工期环境污染,该技术可为绿色建造提供思路。     

内河船舶资产评估的运作

1船舶资产评估概述 在不断发展的船务市场,资产评估机构出具的“资产评估报告书”,为产权转移(买卖)、企业重组、破产清算、抵押贷款、纳税等,提供了经济论证必要的材料,备受社会广泛的关注。     

无线网络与铁路数据业务系统的接入技术分析

结合铁路车辆监控管理系统和铁路无线售票系统的应用需求,介绍了GSM的短消息业务、GPRS数据业务和CDMA数据业务的原理和特点,分析各自的适用范围,给出应用系统的接入方案.     

基于赤平投影法的岩质边坡稳定性分析

岩质边坡的失稳和破坏主要是受岩体中结构面所控制,赤平投影法可以直观地判断各结构面的组合和切割关系,可用来进行岩质边坡稳定性分析。本文在简要介绍赤平投影基本原理的基础上,归纳了在岩质边坡中应用赤平投影法判断岩体滑动形式的方法,详细定义了不同形式的滑体类型并推导出计算边坡稳定系数的公式,最后应用赤平投影法对某边坡稳定性做出评价。