某型舰载机箱电磁屏蔽的结构工艺设计

文章通过对某型加固机箱屏蔽效能的计算分析,论证了缝隙对屏效的严重影响,提出在结构工艺上保证机箱的电磁屏蔽性和抑制电磁干扰的有效措施。     

Route choice preferences: insights from Portuguese freight forwarders and truck drivers

ABSTRACT

Exploring route choice in the context of tolled alternatives can support road operators to achieve better utilization of the infrastructure, as well as maximizing revenue collection. The research presented in this paper is conducted in the context of OPTIMUM, a European Union-funded project. The research objectives include a two-component system of models that proactively calculates commercial vehicles’ toll prices. The component presented in this paper rests on the development of a route choice model that estimates the probabilities of using two alternative routes (toll road vs. national road), based on route attributes and user characteristics. To explore the usefulness of the proposed methodology a case study involving 50 truck drivers and 25 freight operators was conducted in Portugal between January 2016 and November 2017. Results from the route choice model reveal interesting insights about the role of incentives in the choice of toll roads, the perspectives of the different decision-makers and produce Values of Time for the study area.     

箱装体模块内气体净化技术研究

介绍了安装有发动机的箱装体内气体净化技术的研究,所研制的空气净化器从环保角度成功运用于实船。运行状况及大量测量数据表明经过该装置处理的有害气体排放满足相关规定和技术要求。其净化过程的设计优化,对类似空气净化装置产品的开发研究有一定的理论和实际意义。     

某船主机齿轮箱装复过程中的校中与安装

文章介绍了船舶主机齿轮箱在安装过程中,如何保证轴系校中要求和齿轮箱环氧树脂垫浇注工艺以及垫片及螺栓强度计算,可供同行借鉴。     

我国企业文化发展的误区及原因分析

中国企业文化建设作为中国特色社会主义文化建设的重要组成部分,相对于经济、政治、文化的长远发展,作用更加突出．意义也更加重大。立足于分析我国企业文化发展的误区,总结原因．旨在总结过去文化建设的基础,加强我国企业文化建设,以增强企业的竞争力。     

天津港区土质附着力与物理力学指标关系及应用案例

从天津港区易糊刀具黏性土质特性出发,指出决定易糊刀具黏性土质的附着力关键指标为含水率、塑性指数和凝聚力。基于大量的易糊刀具土质室内土工试验资料,应用数理统计方法,对附着力与关键指标含水率、塑性指数和凝聚力之间的相关关系进行了研究分析。结果表明:1)附着力、含水率和塑性指数经验公式的回归系数均在0.8以上,具有较高可靠性;2)天津港航道区域在天然状态下的黏性土质附着力约为塑性指数的3倍。针对具体黏性土质疏浚施工案例,经过附着力和关键指标值的比对,判断出挖掘该状态黏性土具有糊刀具的可能性。     

Transit network design for small-medium size cities

This paper proposes a novel heuristic to solve the network design problem for public transport in small-medium size cities. Such cities can be defined as those with a diameter of a few kilometers with up to a few hundred thousand residents. These urban centers present a specific spatial configuration affecting the land use and mobility system. Transportation demand is widespread in origin and concentrated in a small number of attraction points close to each other. This particular structure of demand (‘many-to-few’) suggests the need for specific methodologies for the design of a transit system at a network level. In this paper, such design methodologies are defined in terms of models and solution procedures and tested on a selected case study. The solution methods show promising results. The key variables of the model are the routes and their frequencies. The constraints of the problem affect the overall demand to be served, the quality of the proposed service (transfer, load factors) and the definition of routes.     

别克Excelle空调电器系统故障检修方案

通过Excelle空调电器系统的常见故障案例,运用本文所设计的检修方案完成故障的排除与检修。     

城市排水泵站工程风险与案例分析

该文以江城武汉的城市排水泵站工程为主,介绍了城市排水泵站工程风险来源的种类、风险责任主体,结合泵站工程案例进行了分析,阐明了风险的关联性责任主体的共同性,可为城市排水泵站工程建设中风险分析、风险预防、风险控制及风险解决提供参考。     

桥梁承载力不足的成因及加固方法探讨

文中从广东省桥梁现状入手,分析了造成桥梁承载力不足的原因,探讨了桥梁加固的一些方法及在实际施工中的应用,提供了桥梁加固方面的一些做法和经验。