中德铁路路基填料分类对比研究

随着国家\"一带一路\"重大战略的提出,为了更好地在世界推广中国铁路技术标准规范,促进其他国家对中国标准的接受和认同。结合利比亚某铁路的路基设计,对德国铁路岩土分类标准、填料类型、填料填筑部位、路基填料的压实指标及标准等方面进行系统分析,同时与中国铁路标准进行相应的对比。研究认为,中德铁路岩土分类、填料分类的主要差别是统一分类法和粒度累积法的区别;路基基床结构主要是单层和多层的区别;而路基的压实指标及标准大致相当,这些差异和相同点对指导使用德国标准的海外铁路项目中路基填料设计具有重要意义。     

地铁车站内空调控制温度及系统运行模式

基于对广州地铁站内气流温度、速度的实测,计算相应的相对热指标(RWI),发现虽然能够按照《地铁设计规范》要求,实现从室外到站厅、站台厅温度的递减,但RWI值波动较大,导致乘客在行进过程中无法获得\"暂时舒适\"。因此,提出根据室外逐时温度,给定适当的相对热指标差值,确定地铁站内夏季空调各时刻运行控制温度,以满足乘客的过渡性舒适要求。根据室外逐时温度变化及客流量的波动,计算地铁站台厅内夏季典型日逐时负荷及逐时送风量,提出夏季风机分时段改变运转速度或运行台数的运行方案。探讨两种极限热损失率(HDR)所对应的冬季地铁车站内的控制温度,提出冬季站台厅温度的调节范围。     

航运市场运费套期保值方法探讨

分析研究了2种运费套期保值方法远期运价协议和运价指数期货合约，通过典型案例论证了租船人和船东都能利用这2种方法，锁定运费收入或支出，从而规避运价风险的目的；同时对这2种方法进行了分析比较，指出运价指数期货合约具有灵活性且安全的特点，但二者费用有差异，运价指数期货合约需要一定的保证金，实际费用等于经纪人的佣金(通常为0．3％)加上现金保证金的利息。     

电子海图单元索引结构的研究与应用

纸海图的索引在《航海图书总目录》中已经实现,为实现电子海图（ＥＮＣ）单元的索引,需建立一个索引结构,本文根据同种航海用途的电子海图单元之间的邻接关系建立网络图结构,根据不同种航海用途的电子海图单元之间包含与被包含关系建立多叉树结构,将这两种数据结构有机组合的索引结构结合散列查找法不但可实现电子海图单元的索引,也对ＥＣＤＩＳ功能的实时实现提供了有力支持     

Origins,Management, and Measurement of Stress on the Coast of Southern Spain

A series of boater compliance studies was performed between 1995 and 1998 in order to assess the effectiveness of existing speed zones designed to protect manatees in two Florida counties (Sarasota County and Lee County). Surveys involved teams of boat- or land-based observers positioned along speed-restricted waterways. Vessel characteristics were recorded along with observed speed. Multiple survey sites were sampled within each county. A total of 26,000 vessels was observed and evaluated. Overall boater compliance was 63% in Sarasota County and 58% in Lee County. Compliance varied significantly with vessel type and size. Differences in compliance among survey sites were also significant and were related to travel patterns, traffic volume, vessel composition, sign placement, level of speed restriction, and law enforcement presence. From a management perspective, it is recommended that speed zones for the protection of manatees be evaluated on a site-by-site basis to identify specific areas of concern.     

论能效设计指数（EEDI）现阶段强制实施的合理性

船舶能效设计指数（EEDI）是对未来造船界有深远影响的一项新的IMO法规。本文从政治、经济及技术等方面对船舶能效设计指数推出的合理性进行了全面的阐述。     

高速公路环境破坏与生态恢复评估研究

针对目前高速公路施工引起的实际环境破坏程度与生态恢复效果缺少定量评价方法的问题,以水土流失、土地利用和地质灾害等作为评价因子,通过专家咨询,建立了高速公路建设对环境破坏程度与生态恢复程度的定量评价指标体系与方法,并结合某高速公路实例进行了应用。     

An improvement in rollover detection of articulated vehicles using the grey system theory

A Rollover Index combined with the grey system theory, called a Grey Rollover Index (GRI), is proposed to assess the rollover threat for articulated vehicles with a tractor–semitrailer combination. This index can predict future trends of vehicle dynamics based on current vehicle motion; thus, it is suitable for vehicle-rollover detection. Two difficulties are encountered when applying the GRI for rollover detection. The first difficulty is effectively predicting the rollover threat of the vehicles, and the second difficulty is achieving a definite definition of the real rollover timing of a vehicle. The following methods are used to resolve these problems. First, a nonlinear mathematical model is constructed to accurately describe the vehicle dynamics of articulated vehicles. This model is combined with the GRI to predict rollover propensity. Finally, TruckSim^? software is used to determine the real rollover timing and facilitate the accurate supply of information to the rollover detection system through the GRI. This index is used to verify the simulation based on the common manoeuvres that cause rollover accidents to reduce the occurrence of false signals and effectively increase the efficiency of the rollover detection system.     

基于顾客价值的汽车销售企业顾客满意度指标体系研究

文章采用顾客价值及层次分析法、专家赋权法、顾客赋权法等多种决策理论方法,结合广西汽车销售市场特点,建立汽车销售企业顾客满意度指标评价体系,对购车顾客满意度进行定性及定量分析,为广西汽车销售企业客观评价顾客满意度及制定更具针对性的产品服务改进策略提供方法依据.     

公路站场规划布局方案综合评价的改进TOPSIS法

文章在确定了合理的评价指标体系的基础上,将熵权法和TOPSIS法相结合对公路站场规划方案进行综合评价,为选择公路站场布局方案提供依据。并通过某市站场规划布局的实例应用,验证了该评价方法的实用性。