浅谈计算机GIS在交通工程中的应用

介绍了GIS的基本功能及在交通工程中的应用情况。实际工作中,采用GIS会极大地提升效率,实现智能化交通。     

舰船用新型飞轮储能动发一体机综合物理场分析(英文)

A novel flywheel energy storage(FES) motor/generator(M/G) was proposed for marine systems.The purpose was to improve the power quality of a marine power system(MPS) and strengthen the energy recycle.Two structures including the magnetic or non-magnetic inner-rotor were contrasted in the magnetostatic field by using finite element analysis(FEA).By optimally designing the size parameters,the average speed of FEA results of was 17 200 r/m,and the current was controlled between 62 and 68 A in the transient field.The electrical machine electromagnetism design was further optimized by the FEA in the temperature field,to find the local overheating point under the normal operation condition and provide guidance for the cooling system.Finally,it can be concluded from the comprehensive physical field analysis that the novel redundant structure M/G can improve the efficiency of the M/G and maintain the stability of the MPS.     

A reinforcement learning framework for the adaptive routing problem in stochastic time-dependent network

Most previous work in addressing the adaptive routing problem in stochastic and time-dependent (STD) network has been focusing on developing parametric models to reflect the network dynamics and designing efficient algorithms to solve these models. However, strong assumptions need to be made in the models and some algorithms also suffer from the curse of dimensionality. In this paper, we examine the application of Reinforcement Learning as a non-parametric model-free method to solve the problem. Both the online Q learning method for discrete state space and the offline fitted Q iteration algorithm for continuous state space are discussed. With a small case study on a mid-sized network, we demonstrate the significant advantages of using Reinforcement Learning to solve for the optimal routing policy over traditional stochastic dynamic programming method. And the fitted Q iteration algorithm combined with tree-based function approximation is shown to outperform other methods especially during peak demand periods.     

滨海核电厂海工建筑物设计标准探讨

作为滨海核电厂的重要组成部分,海工建筑物的设计标准值得研究和探讨。根据核电安全法规及相关规范的要求,对滨海核电厂海工建筑物的结构功能进行分析,将各海工建筑物的安全等级进行系统划分,明确核电厂海工建筑物设计标准需要考虑的内容,并总结海工建筑物设计标准的确定原则。结合国内在建的陆丰核电厂,确定该项目设计参数的标准值,对合理降低核电厂海工建筑物设计标准的思路和方法进行总结,可为类似工程提供参考。     

我国老港区改造模式分析

随着我国沿海地区经济持续快速发展，许多沿海港口同时面临着新港区的开辟与老港区的改造。对老港区存在的问题进行总结归纳，结合案例分析探讨我国老港区的改造模式与思路。     

Analysis of the parasitic copepod species richness among Mediterranean fish

The Mediterranean ichthyofauna is composed of 652 species belonging to 405 genera and 117 families. Among these, 182 were studied for their parasitic copepods. The analysis of all the works conducted on these crustacea yielded 226 species distributed in 88 genera and 20 families. For each fish species we have established a file providing the species name of the fish, its family, its geographical distribution within the Mediterranean and some of its bio-ecological characteristics. Within each file, all the parasitic copepod species reported on each host species were listed. This allowed to know the species richness (SR) of these hosts. We thus produced 182 files within which 226 copepod species are distributed. A program was created under the Hypercard software, in order to analyse our data. Two parameters were studied. The first one is the mean species richness (MSR), which corresponds to the mean of the different SR found on the different host species. The second is the parasite–host ratio (P/H), which is the ratio of the number of copepod species by the number of host species. These parameters are calculated by our program for all the 182 species of Mediterranean fishes retained in our investigation, on the first hand, and, on the second hand, for one particular group of fish species. We used the following variables to investigate their correlations with copepod species richness: taxonomy—fish families, genera and species; biometry—maximal size of the adult fish; eco-ethology—mode of life (benthic, pelagic or nectonic), displacements (sedentary, migratory with environmental change, or migratory without environmental change), behaviour (solitary or gregarious). Other variables (colour, food, reproduction, abundance, distribution area) were also analysed but did not reveal any clear correlation. Providing that our study does not rely on quantitative (prevalence, intensity) but qualitative basis our aim was only to reveal some tendencies. These tendencies are as follows: (1) In many cases, parasite and host phylogeny seem to play an important role. There are fish families with copepods and families with few species of these parasites. The phyletic constraints could be due to the morphological characteristics of the habitat (e.g. structure of the gills) or biological/ecological characteristics that we were unable to identify. (2) It appears that the presence in a same environment of related fish species (e.g. several species of the same genus, or numerous genera of the same family) is correlated with high parasite richness. A likely explanation is that such situations favours alternated processes of lateral transfers and speciation. (3) Some eco-ethological criteria seem to favour the establishment of a large parasite species richness. It should be noted for instance that Mediterranean fishes the most often infected with copepods are generally nectonic or pelagic, migratory, and gregarious species.     

YK型油轮应急拖带装置的设计研究

介绍ＹＫ型油轮应急拖带装置的设计研制过程。根据国际海事组织（ＩＭＯ）１９９４年通过的ＭＳＣ．３５（６３）决议“关于油轮应急拖带装置的指南”的要求，确定了装置的组成部件、技术参数和型号规格；对收缆绞车进行传动计算和强度验算；对强力端结构及焊缝进行强度校核；并确定了船首部和尾部甲板的加固方案。船尾部应急拖带装置中的强力端及导缆座是关键的受力部件，是专门设计的。对该部件的强度和稳定性用结构分析程序ＳＡＰ５进行了有限元计算，结果表明，该设计是可靠的。为使装置能适应多种形式规格液货船的需要，在研制中采用较高的设计标准和Ｂ级优质钢板。除保证钢材在成份和机械性能上的要求外，还对钢材的低温冷脆性能作了补充检测。为确保制作工艺质量，装置的焊缝经过磁粉探伤和超声探伤检验。     

CEC系统信息融合技术探讨

协同作战能力（CEC）系统是未来网络中心战感知网格的重要组成部分，本文将初步探讨CEC系统信息融合技术。首先介绍CEC系统，分析适合于CEC系统的信息融合功能模型，提出分布式融合结构模型，探讨CEC系统中航迹关联算法和目标识别方法等。     

支持向量回归在轮轨Hertz弹性接触计算中的应用

空间轮轨接触是铁道车辆系统动力学仿真对象模型中的重要柔性环节，基于材料线弹性假设的Hertz理论，可以给出两弹性体一般接触的复杂的隐式非线性关系.支持向量回归是统计学习理论中提出的新一代学习算法．轮轨接触计算可以使用它离线学习到一个显式的非线性关系．其逼近精度和表示复杂度可得到很好的折中．有利于铁道车辆系统动力学仿真的在线计算，