调查锚在海缆路由调查中的应用

介绍了海底调查锚的结构和用调查锚进行海缆路由调查的方法。通过实例 ,分析了不同底质情况下的实测结果。     

基于AHP法和灰色模式识别理论的海底管道系统路由定量风险评估

根据海底管道路由潜在风险的特点及风险类型,提出了一种将层次分析法（AHP法）和灰色模式识别理论相结合的海底管道系统路由定量风险评估方法,该方法利用AHP确定风险评价指标体系,运用灰色模式识别理论,建立识别结果标准,并结合实际工程进行计算,计算结果表明该方法是可行的.     

Computer-aided design of bus route maps

The bus route map is a diagram that aims to convey necessary information for map readers to find an appropriate way of moving from an origin to a destination. Design of bus route map is a complicated and time-consuming task that requires careful consideration of readability and aesthetics. This paper proposes a new computational method for designing bus route maps. The method helps us to reduce six types of undesirable elements in bus route maps, i.e., gap, shift, crossing, overlap, misalignment, and acute bend. The method consists of two phases: line layout phase determines the relative order of bus routes on each road segment and map layout phase calculates the actual position of bus routes drawn on a map. This paper applies the method to the design of bus route maps of Chiba City, Japan. The result supports the effectiveness of the method as well as reveals open topics for future research.     

The effects of visual realism,spatial abilities,and competition on performance in map-based route learning in men

We report on how visual realism might influence map-based route learning performance in a controlled laboratory experiment with 104 male participants in a competitive context. Using animations of a dot moving through routes of interest, we find that participants recall the routes more accurately with abstract road maps than with more realistic satellite maps. We also find that, irrespective of visual realism, participants with higher spatial abilities (high-spatial participants) are more accurate in memorizing map-based routes than participants with lower spatial abilities (low-spatial participants). On the other hand, added visual realism limits high-spatial participants in their route recall speed, while it seems not to influence the recall speed of low-spatial participants. Competition affects participants’ overall confidence positively, but does not affect their route recall performance neither in terms of accuracy nor speed. With this study, we provide further empirical evidence demonstrating that it is important to choose the appropriate map type considering task characteristics and spatial abilities. While satellite maps might be perceived as more fun to use, or visually more attractive than road maps, they also require more cognitive resources for many map-based tasks, which is true even for high-spatial users.     

天陇铁路上倪滑坡工程地质特征分析及地质选线

在天陇铁路勘察设计工作中,发现上倪滑坡是新建天水至陇南铁路一处控制性不良地质体。本文在充分获取地质资料的基础上,从地形地貌角度出发,结合其地层岩性特征,分析了滑坡成因,认为上倪滑坡在北侧和南侧各存在一个软弱面,滑坡整体稳定性较差,尤其是滑坡北侧危险性较大。通过力学计算,显示该滑坡自然状态下能够保持相对稳定,但在地震或暴雨天气下发生滑动的可能性极大,对线路工程具有严重影响。经过对三种线路方案的综合比选,建议以深埋隧道形式从后壁通过上倪滑坡,保证工程安全性。     

基于模糊控制的快速循迹智能车的设计与实现

提出基于模糊控制的快速循迹智能车的实现方法.利用转速传感器、线阵CCD、舵机等构成一个闭环控制系统,并采用PI算法控制智能车后轮速度.采用模糊控制算法将线阵CCD返回的误差模糊化,然后按照MAX-MIN规则进行逻辑推理,最后将推理结果反模糊化后以控制舵机转向.实验结果证明了该方法的有效性.     

乘车软件应用前后出租车寻客路径偏好分析

本文尝试通过模拟出租车的路径选择探索乘车软件推广对出租车寻客路径偏好造成的影响。基于出租车的历史寻客轨迹,提取起终点对之间的出租车寻客路径集,选取路径的行程距离、历史乘客数目、历史载客行程距离等六个指标,对出租车的寻客路径选择行为进行多项Logit模型建模。通过分析模型的系数大小,得到各因子对出租车寻客路径选择的影响以及出租车在起终点对间寻客的偏好因子;通过统计出租车在各行政区内或跨行政区寻客时以各因子为偏好因子的起终点对数目,得到偏好因子的空间分布差异;此外,通过对比乘车软件推广前后的建模结果,得到出租车寻客路径选择偏好的变化规律。     

地震作用对琼州海峡海缆路由区海底稳定性影向的分析

以琼州海峡的北海—临高段海缆路由为例,利用计算对比的方法,分析了地震作用下,路由区3m以浅海底土液化或滑移的可能性,评价了路由区海底的稳定性。结果发现,在地震烈度为Ⅶ度的地震作用下,砂性土海底的地震剪应力平均值(0.86kPa,1.72kPa和2.57kPa)小于砂性土的液化剪应力(1.60kPa,3.20kPa和4.81kPa);粘性土海底的地震剪应力平均值(1.25kPa,2.49kPa和3.74kPa)小于粘性土的抗滑剪应力平均值(4.07kPa,4.61kPa和4.49kPa),路由区海底稳定性良好;在地震烈度为Ⅷ度的地震作用下,砂性土海底的地震剪应力平均值(1.73kPa,3.45kPa和5.12kPa)大于砂性土的液化剪应力;粘性土海底的地震剪应力平均值(2.49kPa,4.98kPa和7.47kPa)除表层外,大于粘性土的抗滑剪应力,路由区海底会发生失稳破坏。     

内插法布设无碴轨道铺轨控制测量网方法

针对勘测设计阶段测量精度要求较低,而无碴轨道施工测量精度要求很高的情况。提出在勘测设计控制网中内插高精度施工控制网的方法。导出保持线路控制网两端切线(直线)实地位置不变,布设高精度施工控制网的办法。     

基于AHP方法与GIS技术的海底管道路由选择研究

海底管道路由选择与海底管道建设、运营以及后期管理等工作存在密切联系,对管道工程经济性、安全性和合理性有着重要意义.考虑影响海底管道路由选择的自然与社会环境因素,构建了量化的评价体系,以AHP层次分析方法作为数学依据确定评价权重,建立了标准化的路由选择评判模型.进一步,将该模型与GIS空间分析技术相结合,生成以地图可视化...