Abstract:The ABAQUS static creep calculation module was adopted to simulate the variation of strain with vi- bration frequency. The finite element software was combined with the empirical formula of undrained cumulative deformation, calculating the long-term settlement of the shield tunnel under the cyclic loading of subway trains in Foshan area, which improved the calculation accuracy and efficiency. The relevant parameters in the cumula- tive settlement empirical formula were determined by the dynamic triaxial test results of the silt soft soil in Fos- han. Besides, this method was adopted to predict the cumulative deformation of an interval tunnel in Foshan Rail Transit Line 3 under the long-term load of subway trains. The research results show that as the depth increases, the cumulative plastic deformation is smaller. The accumulated plastic deformation caused by the operation of Foshan Rail Transit Line 3 below the muddy soil part reaches 36 mm over the past 20 years, and the accumulat- ed deformation for one year is about 20 mm.

Abstract:The straddle-type monorail train bogie has unique structures, whose operation, guiding mechanism and contact relationship between the wheel and rail are unusual. Domestic and foreign scholars have conducted a lot of researches on the modeling of dynamics of monorail train and vibration response characteristics, but there were few systematic conclusions. In view of the existing research results, this paper summarized the research methods of dynamic model of straddle-type monorail train and vibration response characteristics and relevant in- fluencing factor. Finally, the research priority in the future was proposed.

Abstract:The construction of metro tunnel is closely related to the geological conditions. Through summarizing the geological exploration data and the engineering data of the planned Hefei metro line 1~5, the distribution of geomorphic feature in Hefei area was also taken into consideration to study the geological conditions of shallow tunneling engineering of Hefei metro in depth. Three different methods including statistical analysis, numerical model and field measurement had been adopted to make the research more comprehensive and rigorous. The re- sults indicate that the overall generalization of the engineering geological layer, namely, unifying and simplifying the serial number of strata by engineering geology, can be followed by the principle that “the sedimentary age of stratum is given to the priority with the application of geotechnical engineering as the complement” in Hefei area. According to the characteristics of stratigraphic section, the stratum combinations which Hefei metro tunnel might cross can be classified as A~D, among them A stratum combination is the most favorable for the tunnel construction, B stratum combination's ability to control the deformation of surrounding rock is superior to C and D stratum combination. The above results can provide guidance for the analysis of geological condition and the construction of Hefei metro tunnel.

Abstract:This paper studied the effects of the single -and double -parallel entry ramp of expressway on the mainline traffic flow. Microscopic traffic simulation software VISSIM was used to simulate expressway import parts of the two ramps under different traffic demands. The analysis of such data as vehicle speed, delay and traffic flow from mainline traffic flow shows that when v/c of the main line and import flow is less than about 0.7, the single-and double-parallel entry ramp has little influence on the operation state of the mainline traffic flow, with the main line still maintaining high speed. In case of ramp forms, factors including land space, construction cost and other factors should be given more attention to. When v/c of the main line and import flow is more than about 0.7, vehicle speed fluctuations of the main line traffic flow of the single-and double-parallel entry ramp is the opposite of the present situation. So the choice of ramp forms in accordance with traffic demands is very im- portant for improving the expressway operating efficiency; when the traffic flow approaches saturation, the single- and double-parallel entry ramps are not different in terms of the mainline operation state. The speed-flow analy- sis of mainline three-lane traffic flow shows that the mainline traffic flow presents obvious free flow and conges- tion flow regarding double-parallel entry ramp while the mainline traffic flow keeps steady regarding single-par- allel transport ramp.

Abstract:By taking a shallow tunnel in the Fengtan railway line as the research object, based on the finite ele- ment software ABAQUS, this study conducted the three dimensional numerical analysis of the influence of adja- cent small tunnel blasting vibration on the deformation of close-spaced hydraulic tunnel in light of two aspects including the tunnel monitoring point displacement and the vibration velocity. The results are as follows: com- pared with the single pilot tunnel, the blasting of the pilot tunnels has more influence on the vault of the existing hydraulic tunnel, and the peak value of blasting load has great influence on the displacement of the existing hy- draulic tunnel and the velocity of particle vibration; the displacement of the lining vault is greater when the blasting vibration is detonated at the top of the hydraulic tunnel, and the position of blasting pilot tunnel affects the displacement of existing hydraulic tunnel and vibration velocity of particles.

Abstract:The weight balance calculation of the electric multiple units (EMUs)has effects on the train safety. In this paper the weight balance evaluation indexes of the EMUs were analyzed; the structure of the commonly-seen Bo-Bo shaft type EMUs was studied and a three-dimensional mathematical model for the vehicle was estab- lished. The rigid force balance principle and the torque balance principle were adopted for static analysis, and the calculation formulas of vehicle gravity center, axle load and axle load difference, wheel weight and wheel weight difference were derived. Then, the weight balance calculation software was developed for the EMUs based on the C# language of the Visual Studio 2010 platform and the SQL Server 2008 database. And the correctness of the software calculation results was verified by comparing the calculation results of the software with the mea- sured data. The proposed software can not only realize the weight balance calculation of the EMUs, but also manage all the vehicle data and improve the utilization rate of the data of the vehicle parts. Meanwhile, it will also be of reference for the tool development of other rail vehicles.

Abstract:Aiming at insufficient facility capability during the peak period of passenger flow at high-speed rail- way stations, based on the analysis of passenger flow data from the peak period of the National Day in Dalian North Railway Station, this paper forecast the peak hour passenger flow on the first day of National Day from 2018 to 2020 by using grey forecast model to identify the bottleneck points of the facilities in the flow line of the entrance and to analyze the adaptability of the facilities in the peak period of the passenger flow in Dalian North Railway Station. The research results show that the bottleneck at the current main streamline is Ticket Office A2, Security Checkpoint 1 and Security Checkpoint 2. Besides, by 2020, with the increase of passenger flow, the tension of the station facilities will be very prominent. The ticket office will face the biggest pressure due to the worst facility capacity adaptability of the Ticket Office B2. Finally, this paper proposed some relevant counter- measures.

Abstract:The different sharing proportion of revenue for operating airline determined the different value of O-D, and the operating airline decided to receive a ticket or the marking airline depends on the revenue sharing pro- portion instead of the ticket fare. So the optimizing of seat allocation depends on the revenue sharing mechanism. The paper abandons the original pattern and the airlines allocate their seat capacity according to the seats’ own value. Regarding the airline alliance as the auctioneer and seat capacity in an itinerary as lots, we establish the model of multi-stage dynamic combinatorial auction to allocate the seat capacity and get the maximize revenue of airline alliance. The numerical studies reveal solve the problem of the seat capacity allocation，which is prac- tical and innovative.

Abstract:The unexpected events can lead to the random fluctuation of the market demand and price, and the information asymmetry of supply chain members as well. Under this condition, the linear equilibrium wholesale price was determined through two-way auction. Then, emergency repurchase contract was used to coordinate the two-level supply chain and obtain the constraints of contract parameters. Finally, an example was given to ana- lyze the impact of emergencies on the overall profit distribution in the supply chain. The research results show that when an emergency with increasing demand occurs, the linear equilibrium wholesale price and the expected profits of retailers will increase, but the weight of the retailers’ expected profits in the entire supply chain will be reduced. However, when an emergency with decreasing demand occurs, the linear equilibrium wholesale price and the expected profits of retailers will be reduced, but the weight of the retailers’ expected profits in the entire supply chain will increase. In addition, under certain constraints, the lower the retailer's valuation of goods is, the higher the weight of its profits in the entire supply chain is.

Abstract:A method based on two person zero sum game is proposed to deal with the single strategy and unclear expected payoff in grey MADM, considering that the characteristic to maximize the benefits of the decision maker is similar to the characteristic of game theory in solving the optimal mixed strategy. First the method uses the language information decision to construct the original evaluation information, then the FIFWAA is used to get the quantitative gray evaluation matrix. By solving the grey linear programming, the optimal blending strategy of the decision maker and the expected return of each scheme are obtained. Through the probability matrix, the sorting vector is formed and the scheme is sorted. Finally, the feasibility of the method is illustrated by an exam ple. And other methods are used to conduct contrast and analysis.

Abstract:Based on the OV model, this study, by taking into account individual vehicles’ perception of the road ahead in the mixed traffic flow, established a car-following model of multiple distances and analyzed its linear stability theoretically. The platoon, mixed with the vehicles of multi-distance car -following characteristics, is more stable and the large acceleration in OV model can be improved. It applied the car-following model of mul- tiple distances into the modeling of driving behaviors and traffic flow in mixed traffic flow. The numerical simu- lation was demonstrated to study the mutual transformation between high -speed steady state and low -speed steady state in the mixed traffic flow with different cart proportions and traffic entropy. The research results show that the traffic wave in the mixed traffic flow spreads faster and the time of acceleration and deceleration is shortened, which, to a certain degree, can alleviate traffic congestion. It maintains that with the increase of traffic entropy, traffic congestion becomes less and less obvious.

Abstract:Since buses need to stop at harbor-shaped stops for passengers to get on and off the vehicles, the cur- vature of the lane change curve at the final stop point is not zero but approximate to zero. In lane changing tra- jectory planning algorithms, lane changing target position has been given artificially. Due to the complex urban traffic environment, there is a great deal of uncertainty, which affects the accuracy of the final trajectory curve. To solve the problem, this paper obtained the data of the actual lane changing trajectory through field investiga- tion. Based on the linear functional lane changing trajectory model and sine functional lane changing trajectory model, and combined with the multivariate linear models of lane changing time, bus entry speed, spare berth number as well as longitudinal distance of lane changing, an optimized lane changing trajectory model for bus arrivals of harbor-shaped stop was proposed. With the given evaluation parameters of the lane changing trajecto- ry, the lane changing trajectory from this optimization model was calculated by means of Matlab simulation test. Comparison between the lane changing trajectory curve and lane changing trajectory curve based on the sine functional lane changing trajectory model as well as the bus lane changing trajectory in the actual situation was made. The simulation results show that this optimization model is feasible and effective.

Abstract:This paper mainly analyzed the necessity of sludge water proposal in water purification plant and the physicochemical properties of sludge water. In addition, it summed up the main ways and development trends of sludge water utilization in water purification plants at home and abroad in recent years from the perspective of resource utilization. In small waterworks, it is an economical and reasonable resource-based disposal plan to re- alize the reuse of sludge water. Based on the main ways and characteristics of the reuse of sludge water, it dis- cussed the mechanism of strengthening coagulation in electric neutralization and the stability of colloid particles in water after reusing sludge water. Finally, it analyzed the effects of the sludge water reuse on the water quality safety of the original water purification process as well as the risk control.

Abstract:The 3-D dynamic fire evacuation strategy based on the improved ant colony algorithm was proposed in this paper to solve the issue of emergency evacuation when fires occur in complex buildings. Firstly, the grid method was adopted to establish 3-D environment model for the designed building. Then, by using the improved bio-heuristic ant colony algorithm, evacuation routes were automatically mapped out to obtain the shortest evac- uation route. Finally, the best evacuation route was planned according to the dynamic diffusion characteristics of fire points. This approach not only improved the ant colony algorithm model, but also added the target heuristic function and fallback strategy, which, to a certain degree, shortens the time of path searching and improves the efficiency of the algorithm. The simulation results show that this strategy is effective in terms of 3-D fire evacua- tion.

Abstract:In recent years, internet of things(IOT) has been widely used in smart home system. Wireless sensor networks(WSNs) and ZigBee protocols are key technologies in smart home systems based on internet of things. In the actual application process, the networking algorithm of sensing layer in existing smart home systems has certain limitations. To improve the practicability of the sensing layer network, this paper proposed a key-based broadcast networking algorithm and the efficiency of network access underlying ZigBee protocol stack was im- proved. Meanwhile, the coordinator is always unstable for storing data in real applications. In view of this prob- lem, this paper, based on ZigBee protocols, put forward an improved non-volatile memory(NV) storage algorithm. The research results show that the proposed algorithm has high reliability and may effectively improve the com- munication network operability.

Abstract:Direct heating electrothermal method was adopted to study the effects of different electroplating pa- rameters on the morphology of nano carbon grown on the surface of carbon fibers. The nickel plating on the sur- face of carbon fiber was treated by electroplating with different electroplating parameters. Chemical vapor depo- sition of nickel plated carbon fibers prepared by electroplating was carried out to obtain nano carbon from exper- iments. Through technique of sedimentation, the sizes and shapes of the nano carbon with different electroplating parameters were compared in order to explore the relevant effects of electroplating parameters. The research re- sults show that when the plating time is 3min, the distribution of nickel catalyst particles on the surface of car- bon fibers is uniform. The electroplating nickel is evenly distributed on the surface of carbon fiber, and it has a suitable size. The carbon fiber can produce better deposited carbon. Different shapes of nickel catalyst particles can grow on the surface of the fibers treated with different morphologies of nano carbon.

Abstract:This paper studies the influence of the cross-Kerr(CK) coupling on the production of entanglement be- tween two movable mirrors in an optomechanical system formed by two movable mirrors. It finds the frequency range for generating the entanglement of two movable mirrors could be effectively extended by the CK coupling. In particular, the maximal entanglement of two movable mirrors can be increased by the CK nonlinear medium. Our results suggest that the CK nonlinear medium could be used to improve the entanglement of two oscillators in optomechanical systems which could be useful for generating mesoscopic entanglement in experiments.

Abstract:West Africa has rich natural resources and great potential for development. With the deepening of the Maritime Silk Road, demand for capacity cooperation between West Africa and China has been increasing. Gray relevance evaluation was adopted to study the competitiveness of capacity cooperation between west African countries and China. The evaluation indicators focus on the trade, production, consumption and logistics of west African countries. In terms of trade level, imbalance of imports and exports was regarded as an important indica- tor. Then, generation of coefficients was used to calculate the import and export volume of containers in foreign trade among the sixteen west African countries and the foreign trade imbalances among them were determined. Then, the variation coefficient method was used to determine the weight of each index, and the degree of gray correlation was obtained to reflect the level of competitiveness. The research results show that Nigeria, Cote d'Ivoire, Ghana, and Benin and other countries, as key targets of China’s capacity cooperation, have strong com- petitiveness in manufacturing capacity cooperation, which has provided important reference for China to explore industrial construction and enhance manufacturing capacity cooperation in west Africa under the “Belt and Road” initiative.

Abstract:Most of the existing studies on multi-attribute decision making problems of evaluation index prioritiza- tion have not taken the prioritized degrees (the importance degree) into account, which usually plays a construc- tive role in the comprehensive evaluation results. This paper tries to develop an effective method for solving mul- ti-attribute decision making problems, considering not only the prioritization relationship but also the prioritized degrees. Firstly, the prioritized averaging operator was improved. Moreover, the membership degree functions were constructed and the prioritized averaging operator considering the prioritization and prioritized degree of in- dicators simultaneously was proposed. Finally, an example of the comprehensive evaluation of integrated logistics enterprise level was given to prove the validity and superiority of the proposed models and method.