A Network Perspective on Spatially Clustered Territorial Use Rights for Fishers (TURFs) in Vietnam

Co-managed territorial use rights for fishers (TURFs) have shown promise for small-scale fisheries management. The territorial use rights help clarify access and ownership rights, while co-management arrangements create formal relationships between fishers and government. However, there is limited research into the governance processes that influence the interactions and complementarities of TURF zones that are clustered together. In a network of 16 co-managed TURFs in the Cau Hai lagoon, Vietnam, we analyzed management decentralization and the relationship between spatial and networked (social) proximity. Our findings draw attention to several broad lessons for co-managed TURFs: (1) TURFs may operate as isolated silos if co-management agreements do not address relationships among TURF leaders; (2) spatial proximity does not automatically translate to social proximity; and (3) leaders of individuals TURFs need capacity for communication and coordination with other local fisheries leaders. These findings highlight the importance of consideration to the ways that TURF design and implementation influences the relationships and collaboration between fishers, government officials, and other actors.     

Happy today,satisfied tomorrow: emotion—satisfaction dynamics in a multi-week transit user smartphone survey

Transportation - Travel well-being encompasses three dimensions: cognitive satisfaction judgments, positive emotions, and negative emotions. Most previous literature on transit users focused either...     

Dynamic pricing of free-floating carsharing networks with sensitivity to travellers’ attitudes towards risk

Transportation - Free-floating carsharing (FFCS) systems are characterised by volatile fleet distribution as well as customers’ heterogeneous price sensitivity and spatiotemporal flexibility....     

Voyage-based statistical fuel consumption models of ocean-going container ships in Korea

ABSTRACT

Accurately estimating fuel consumption of ships is crucial for shipping companies, port authorities, and environmental protection agencies. The bottom-up approach is becoming increasingly popular because it can estimate ship fuel consumption by accounting for ship activity conditions, such as changes in voyage speed, time, and distance; however, its use is still limited when estimating ship fuel consumption. Ship-specific information, such as the daily fuel consumption rate for main and auxiliary engines for every vessel, is expensive to gather, and generally not collected from private shipping companies. To address this research gap, we develop simplified and composite ship fuel consumption models for ocean-going container ships by size using a regression model. To estimate the fuel consumption models for container ships, we rely on ship activity data, including average speed and sailing time, distance, and actual fuel consumption for main and auxiliary engines. This information is obtained from a major container shipping company in Korea. We estimate and validate the parameters associated with fuel consumption for five different container ship sizes, all of which are smaller than the Post-Panamax container ship (15,000 TEU and above).     

联络通道冻结工程中冻土力学性能研究及安全性评价

以广州地铁7号线北滘新城站-林头站区间2#联络通道及泵房冻结工程为背景,开展冻土物理力学性能试验及冻结壁安全性评价.通过试验得到-5℃、-10℃以及-15℃条件下粉质黏土及粉细砂冻土单轴抗压应力-应变曲线,以及-10℃温度下粉质黏土及粉细砂冻土抗折强度.-10℃温度下,粉质粘土单轴抗压强度平均值为2.63 MPa,弹性...     

车道线识别中的自适应Canny边缘检测及改进研究

针对Canny边缘检测阈值在车道线识别中不易选取的问题,提出了基于Otsu算法实现自适应Canny边缘检测的方法。实验验证表明,其对远视野道路图像可以获得良好的边缘检测效果,而对近视野道路图像效果较差。进一步提出了目标区域补偿策略改进上述算法。结合Hough变换算法,实现了车道线的识别。实验结果表明,改进的算法可以达到实时获取车道线的要求。     

一种轮胎式龙门起重机燃料电池混动技术

为降低港口机械设备的排放,提出一种应用于轮胎式龙门起重机的零排放的燃料电池混动技术.给出了该动力系统架构及配置参数,对比分析了小柴电混动技术经济性,该系统将在控制使用成本方面具有优势.     

基于ACS800-104LC的大电机试验平台

本文介绍了一种新型的电机试验平台及控制原理。平台运用了变频调速,有缘整流及公共直流母线的能量回馈,能够适应不同类型的电机的多种试验,采用了ABB最新的ACS800-104LC水冷模块R8i,运用了直接转矩控制(DTC)和四象限运行原理。试验表明:试验平台运行稳定,试验精度高,有效地实现了能量回馈。     

多联大跨连续梁桥上无缝线路纵向附加力规律研究

高速铁路多联大跨连续梁日益增多,而该工况下桥上无缝线路设计经验较少,亟须该种工况下桥上无缝线路纵向附加力变化规律。文中建立了钢轨-扣件阻力-梁体-墩台一体化空间非线性有限元梁轨相互作用模型,并利用ANSYS分析软件进行求解,计算分析了不同扣件阻力及不同桥跨布置工况下桥上无缝线路纵向附加力,并总结出纵向附加力变化规律。     

Nudging people towards more sustainable residential choice decisions: an intervention based on focalism and visualization

Transportation - There have been numerous behavior change studies focused on sustainable travel mode choices. In this study we focused on the residential choices that in turn influence travel...