Rail systems in urban areas have been developing rapidly in recent years. Numerous risk events at rail stations reveal the vulnerability of rail system. The interdependent risks in the stations interact with each other and may further form risk interaction chains and networks. However, most of the studies treat risks independently. In response, this paper aims to explore the safety risk interactions in rail stations as they can be as serious as those in rail systems generally. This involves a four-step case study. In step I, 62 rail station risk events were collected from 62 stations worldwide. 25 risks are then identified from these events and 241 risk interaction chains extracted in steps II and III respectively. In the last step, the 241 chains are used to construct a Bayesian network to identify their sensitivity levels and the key risk chains. This shows there are 8 sensitive risks and 9 key risk interaction chains. This paper proposes a risk interaction analysis method for the operational risks in the rail station. The results provide a better understanding of rail station safety and are beneficial for formulating the safety management strategies of rail stations worldwide.

The dual graph is constructed based on the generalized topological road network by using dual topology method .By introducing the concept of m-order neighbors and taking into account the factors of the node’s degree ,betweenness centrality and distance within the dual graph ,the importance contributions of the node-self and first to m-order neighbors and defining the evaluation model for node importance is considered .Based on this ,a road selection process based on the evaluation of node importance for dual graph is proposed .In order to verify the efficiency of this process ,the degree distribution is introduced to evaluate the level of maintaining the global structure and topological characteristics of road network ,and real urban road network is used for experiments .The results show that this road selection process can maintain the global structure and topological characteristics of the original road network ,keep the selected road network well connected ,and also this method is stable and reliable .

In this study, we conducted salt spray corrosion test of 6005, 6082 aluminum, we can evaluate the salt spray corrosion performance of 6 series aluminum through the comparison of sample mass of different days before and after the experimental, the observation of the microstructure of the specimen as well as the analysis of corrosion products, etc. The experimental results showed that: 6 aluminum alloy corrosion is sensitive to salt spray corrosion, the degree of 6005,6082 aluminum corrosion increases with the increasing of etching time, but Substantially, corrosion rate increases with etching time in the beginning and then decreases. In the beginning the etching degree of corrosion of 6005 is less than 6082, with the etching time, the etching degree of corrosion of 6005 is greater than 6082 in the mid, and the etching degree of corrosion of 6082 is greater than 6005 in the last.

Fatigue test of the welded joint of 5083 aluminum alloy with smooth and height of specimen and the weld zone than the high test measurement and theoretical stress concentration coefficient calculation, the weld reinforcement effect of stress concentration on the fatigue performance of welded joints. The results show that: Smooth tensile strength of specimens for 264MPa, fatigue strength is 95MPa, the tensile strength of the 36%. Higher tensile strength of specimens for 320MPa, fatigue strength is 70MPa, the tensile strength of the 22%. Higher specimen stress concentration coefficient is 1.64, the stress concentration to the weld toe becomes fatigue initiation source, and reduces the fatigue strength and the fatigue life of welded joints.

corrosions on gathering and long-distance pipelines in high sour gas field are often found on the HAZ, coarse grained region is the weakest region in the HAZ. We got L415 Pipelines coarse grained region of different heat inputs and post-treatments by welding thermal simulation, researched microstructures, hardness, impact energy and fracture, the result showed that, when the heat input is 25KJ/Cm, followed by annealing treatment with temperature 700°C for 1 hour, we can get good mechanical properties of coarse grained region.

Traffic flow transmission is a constantly important aspect of complex networks, geographical information science, and other science and engineering fields. Previous studies have shown that vehicle flow is more strongly correlated with morphological properties of streets than those of axial lines. In addition, street-based topological representations are more suitable for vehicle flow prediction, as well as more memory-oriented and global in nature. In this study, we construct a dual graph to represent the street–street relationship and propose a routing strategy for networks on the basis of gravitational field theory. We aim to diminish traffic congestion and enhance the transmission performance of networks. We borrow from gravitational field theory in establishing a gravitational field stimulated by a node in packet transmission and in defining the corresponding gravitational field equation. On the basis of this study, we present a mathematical model and a routing strategy. Experimental results indicate that compared with the shortest path routing strategy, the proposed method considerably enhances network capacity and effectively balances network traffic flow, especially for congested networks. We achieve critical gravitation that can always maximize network capacity, regardless of the values of other parameters.

In this paper, we study the Bus Terminal Ticketing System. In the research, passengers are divided into post-purchase and direct purchase according to the characteristics of fare-paying, and the day is divided into three periods according to the average arrival time step. In the three time periods, simulation software AutoMod is applied to simulate and run the queuing system in order to optimize the number of ticket window sales and improve the efficiency of the system.

Femtocell systems are providing cost-effective high-bandwidth service in wireless cellular systems under very low transmission power compared to macro-cell. Normally, conventional handoff algorithms can't well satisfy the mobility in hierarchy networks because of femtocell's characteristic. Therefore a user's state and SINR-based handoff (SINR-US) algorithm from macrocell to femtocell under the consideration of both large discrepancy in the transmit power of the cells and users' state is proposed, which combines SINR used instead of RSS and users' velocity, QoS requirement of users as decision criterion. Numerical results show that the proposed algorithm obviously increases the number of the handoff compared to conventional algorithm, as well as improving the utilization of Femtocells. Additionally it cuts down the unnecessary handoff that doesn't satisfy users' state requirement.

This paper analyzes the queuing process at the export intersection bus stop based on queuing theory. In addition, it builds up a bus stop queuing model. The paper finds the average queuing length and the utilization of Berths with the help of evaluation index of average waiting time for buses. Finally, this paper demonstrates the relationship between the bus flow rate and the number of berth according to the result of the bus stop queuing system simulated by AutoMod software.