bluuebunny/crossref_metadata_2025_split huggingface dataset:
Aviation Business Volume Forecast of Xianyang International Airport Based on Multiple Prediction Models
Authors: Lei Jichao , Chong Xiaolei , Long Xiaoyong 
Published: December 2019

Abstract
With the continuous development of the strategy of the development of the western region and the gradual advancement of the “One Belt, One Road” strategy, Xianyang Airport serves as the gateway for foreign exchanges in Xi’an, and the passenger and freight traffic volume has increased year by year. This article is based on the passenger and cargo traffic that has been available from 2009 to 2015. We will use the trend extrapolation method, the econometric method and the market share method to predict the passenger and cargo transportation volume from 2016 to 2018, comparing with the actual passenger and cargo transportation volume. Then we can obtain the annual error, and find the average error. According to the average error, the weights are determined. Finally, we combine the result with its weight, comparing with accurate result, and get more exact result. Therefore, this method is applied to the forecast of aviation traffic from 2019 to 2023, and then more accurate results are obtained. According to the air passenger and cargo transportation volume in the next five years, combined with the basic economic and population conditions, it will provide reference for the future development and functional positioning of Xianyang Airport.
Study on the Influence of Crosswind Angle and Longitudinal Spacing on Buses in a Platoon
Authors: Zhao Dongchang , Zhang Danyang , Chen Chuan 
Published: December 2019

Abstract
The influences of crosswind angle and longitudinal spacing on bus platoon are studied by methods of theoretical analysis and numerical simulation. The results show that the wind resistance coefficient of the bus increases first and then decreases with the increase of crosswind angle. The maximum wind resistance coefficient is about 2.3 times of that without crosswind when the crosswind angle is 30°. When buses in a platoon at a crosswind angle of 20°, the pressure increase on the windward side of the rear bus is much greater than that on the windward side without crosswind. This shows that crosswind shortens the distance between the two buses at high fuel economy.
A new approach to identify the target market of new gateway airports
Authors: Wang Zheqing , Lu Jing , Cheng Lv 
Published: December 2019

Abstract
Benefiting from the Belt and Road initiative, China experiences the flourishing cross-border trading and tourism. Meanwhile, explosive air transport demand arises in Chinese Bay Area as its strategic position on the Belt and Road. As an important infrastructure in Chinese Bay Area, Hong Kong-Zhuhai-Macao Bridge has connected Zhuhai airport and Hong Kong airport. As a result, we firstly propose a new international transfer mode called “air-bus-air”. In order to identify the target market of “air-bus-air”, a path choice model is established integrating multinomial logit model and latent class model and validated by path choice data. Test results indicate that a latent class model with three segments performs best and this method is effective in improving the accuracy of market segmentation.
Pricing Competition for Ocean Transportation with Heterogeneous Carriers and Empty Container Repositioning
Authors: Yu Mingzhu , Qv Jiayin , Yi Zelong , Yang Ruina 
Published: December 2019

Abstract
In this paper, we study the pricing competition in an ocean transportation system involving two heterogeneous ocean carriers who provide ocean container transportation services between two sea ports. The empty container repositioning issue and Hotelling demand model are emphasized. We model this problem as a pricing game and derive the pricing equilibria of the two ocean carriers under both homogeneous and heterogeneous conditions. We fully characterize the impacts of empty container imbalance degree and various parameters. The computational studies reveal that the developed carrier (the one with lower operation costs) in the system bears more empty container repositioning than the developing carrier when the trade imbalance intensifies. The intensification of carrier difference will increase the two carriers’ total profit.
Calibration Method for Microscopic Simulation Model of Urban Expressway Using Internet Traffic Operation Data
Authors: Wang Bo , Gu Jingang 
Published: December 2019

Abstract
To develop a calibration method for microscopic simulation model of urban expressway using internet traffic operation data, a practical calibration process is proposed in this study. In this process, a sensitivity analysis was conducted to detect those parameters that impose the most influence on simulation model. Then the Latin Hypercube Sampling Method is used to generate workable amount of parameter sets for simulation run. The parameter set that produces the least discrepancy between the simulation model and the actual condition would be the calibrated parameter values. To demonstrate the feasibility of the proposed method, an example of the Inner Loop Expressway network in Wuxi City is modelled and calibrated using VISSIM. After calibration, the simulation model can accurately represent real-world condition.
Dynamic Selection of D2D Communication for Internet of Vehicles
Authors: Wang H L , Qiu G A , Bao Z H , Wang W 
Published: December 2019

Abstract
Vehicle communication technology, as the core technology of intelligent transportation system, is expected to pass various communication connection means, combined with artificial intelligence, situational awareness, monitoring device, and precise positioning system, to solve the demand of the intelligent transportation system in the car safety, transportation efficiency, and the information service, etc. And it has the potential to serve driverless system. Device-to-device(D2D) communication is suitable for short distance vehicle communication because of its related characteristics and advantages. D2D users multiplexing cellular network spectrum will bring the same frequency interference problems. In order to avoid interference, improve system performance, this paper proposes a vehicle networking D2D communication mode based on spectrum sensing dynamic selection method. Simulation results show that the system capacity can be maximized by changing the sensing time of spectrum. Dynamic selection model is verified through the comparison superiority, and provides the intelligent transportation system a better vehicle-to-vehicle communication method.
Orthogonal Testing on Ratio of Physical Simulation Material Similar to Sandstone
Authors: Zhang Yanli , Wu Yongping , Xie Panshi 
Published: December 2019

Abstract
In this paper, the ratio of physical simulation material similar to sandstone was studied through orthogonal testing, which was made up of five levels and four factors (sand-cement ratio, cement ratio, molding loading rate and molding pressure). Physical and mechanical parameters including density, uniaxial compressive strength, elastic modulus and tensile strength of the physical simulation material were obtained by the testing. The key influencing factors and variation rules of physical and mechanical properties of the material were analyzed by range analysis method. The results show that the factors affecting density from large to small are: molding pressure, sand-cement ratio, cement ratio and molding loading rate. The density increases with the increment of both molding pressure and sand-cement ratio. However, the density value decreases slowly with the increment of loading rate, and it does not change significantly with the increment of cement ratio. Uniaxial compressive strength (UCS) is influenced by factors including sand-cement ratio, molding pressure, cement ratio and loading rate. The UCS decreases with the increment of both sand-cement ratio and loading rate, and increase with the increment of cement ratio and molding pressure. Both elastic modulus and tensile strength are influenced by sand-cement ratio, cement ratio, molding pressure and loading rate, too. The elastic modulus and tensile strength decrease with the increment of sand-cement ratio and loading rate, and increase with the increment of cement ratio. Meanwhile, they increase slowly with the increment of molding pressure. The linear regression equations between all considering factors are obtained through the testing, which provide scientific basis for the reasonable selection of the material ratio in the physical simulation experiment.
Improving deterministic pitch motions estimation using bivariate sequential wave input
Authors: Liu Yucheng , Zheng Qiumeng , Duan Wenyang , Huang Limin 
Published: December 2019

Abstract
As the ship navigates through waves, it will sway continuously with six degrees of freedom, which will adversely affect the offshore operations. Accurate real-time estimation of deterministic ship motions under wave excitation is a key to ship motion prediction and assistance decision-making. In the actual marine environment, ocean waves and ship motions are often nonlinear. Therefore, an effective nonlinear estimation model to accurately estimate the real-time response of the wave-induced ship motions is of great concern. Due to its unique advantages in dealing with nonlinear time series, Long Short-Term Memory network can provide a powerful method for the estimation of nonlinear wave-induced ship motions. Pitch motions as an oscillating motion put forward higher requirements for model input. Based on the Long Short-Term Memory network model using the wave time history information as input to estimate the ship pitch motion, this paper proposes a pitch estimation model received a bivariate sequential wave time series as input. With the use of the nonlinear wave generated by numerical simulation and the corresponding ship motion time history data, the feasibility of the new model is verified and compared with the corresponding single-point sequential wave input model, determined its superiority.
Parameter Correction of VISSIM Multi-intersection Simulation Model Based on Combined Genetic Algorithm
Authors: Zhang Jing , Lin Zhang , Wang Changwei 
Published: December 2019

Abstract
In the field of traffic simulation research, the requirements of microscopic traffic simulation model accuracy and intersection popularity are getting higher and higher. Aiming at the shortcomings of traditional genetic algorithm, such as slow speed, huge time-consuming and easy to fall into local optimum, a parameter correction algorithm for VISSIM simulation model based on combined genetic algorithm is proposed in this paper. Neural network is used to predict and analyze, and genetic algorithm with partitioning operator is used to correct the parameters, and the error of simulation delay and measured delay is designed as the objective function. Finally, taking three typical continuous intersections of a main line as an example, a microscopic traffic simulation model is established and the parameters are corrected. It is showed by the results that the corrected error is as low as 9.63%, which proves that the proposed method is feasible and robust.
Research on Assembly Sequence Planning of Marine Diesel Engine Based on Improved Genetic Algorithm
Authors: Wei Wang , Zhang Xinyu , Zhang Wenping , Shang Zhaobin 
Published: December 2019

Abstract
That genetic algorithm is applied to the assembly sequence planning of marine diesel engine can improve assembly planning efficiency a lot. The genetic algorithm crossover operator of genetic algorithm is improved. By combining the clashes matrix and priority relationship matrix, the relational-clashes matrix is established. In order to get the assembly sequence which can assembly safely and effectively, but conform to the actual assembly habits as well, the fitness function combines the feasibility of assembly sequence, the rationality of assembly sequence and the number of redirection. The evaluation method based on the general principle of assembly sequence was proposed for the first time. Priority of parts is evaluated according to their barycentric coordinates and precision level. The evaluation method can enrich the evaluation method of assembly sequences and expand the application of intelligent algorithms in the field. After some tests and analysis of the experimental results, the algorithm proved to be convergent and the results are effective.
Simulation research on measurement method of geometric parameters of non-contact pipe thread
Authors: Liu Yanshu , Li Wenjie , Song Ziyang , Li Zhong 
Published: December 2019

Abstract
In order to ensure that the pipe thread exerts its good sealing and transmission performance in the oil and gas pipeline, it is essential to judge the geometric parameters of the pipe thread. The experiment uses the 60° standard sealed pipe thread of model NPT1/2 as the research target, the machine vision technology is used to make non-contact measurement of the pipe thread geometry, LABVIEW is used as the software development platform to analyse the processed thread image. Finally, the parameters such as pitch, thread angle, taper, and thread height are simulated and measured to obtain the qualification conclusion.
Micromechanics Analysis of Elastic Properties of Flexible Matrix TWF Composites
Authors: Li Yichen , Song Yanping , Hu Fei 
Published: December 2019

Abstract
Using carbon fibers triaxial woven fabric (TWF) as a reinforcing material and compounding with a suitable flexible matrix material to form a composite shell film structure. It is a new type of high precision deployable antenna implementation. In this paper, the elastic properties of TWF composites using silicone rubber are studied. Using the micromechanics method, the three-dimensional unit cell characterizing the structural properties of the braided composite material is carried out. Homogenization finite element analysis will ultimately yield the elastic modulus of the entire composite. Firstly, considering the fiber bundle interlacing, the unit cell is finely geometrically modelled. Next, the unit cell is analyzed by finite element and periodic boundary conditions are applied. The method of homogenization is used to obtain the volume average stress and strain through six independent loading analysis, and the stiffness matrix is obtained, and the engineering constant is finally obtained. Finally, the effect of fiber volume fraction on elastic properties is analyzed. At present, there are few researches on flexible matrix TWF composites at home and abroad. The research on the elastic properties of the material has laid a solid foundation for further research on the performance of the material in the future.
Numerical and Experimental Research on Nonlinear Vibration of High Line Speed Friction Pairs of Vehicle Clutch
Authors: Li Jie , Wang Xiaoyan 
Published: December 2019

Abstract
By analyzing friction pairs surface structural characteristics and using theory of contact mechanics, contact mathematic model of microscopic units of thermal distorsion friction pairs is built. Using mathematical statistics and normalization method, microscopic model can be transferred to macroscopic mathematic model, and then the elastic contact characteristics of friction pairs can be calculated. When Kelvin-Voigt model was inputted into elastic contact characteristics, and viscoelastic contact differential operator was led in equation, viscoelastic contact mathematic model that includes the relation of stress to strain is built. So colligating above all the simulation results, axial vibration mathematic model is built, and the nonlinear vibration characteristics and curves of high line speed friction pairs are obtained by simulation. For verifying simulation results, nonlinear vibration experiment of friction pairs of clutch is tested on conditions of various rotational speed. Result shows that the accuracy of the model is 87%, which is meaningful on both theory and engineering design. It promotes study on vibration characteristics to improve friction pairs serviceability and life.
Preparation and NIR light-driven photocatalytic properties of β-NaYF4:Yb3+, Tm3+/ZnO core-shell composites
Authors: Yi Zhigang , Jiang Tao , Ma Xuguang , Zhang Ying , Tang Qiong 
Published: December 2019

Abstract
A novel UV/NIR light-driven β-NaYF4:Yb3+, Tm3+/ZnO core-shell composites were prepared via microwave assisted hydrothermal technology. The results of characterize indicated that the β-NaYF4:Yb3+, Tm3+/ZnO was obtained by loading ZnO on the surface of β-NaYF4:Yb3+, Tm3+, which could efficiently absorb the UV emission light via upconversion process of β-NaYF4:Yb3+, Tm3+. The degradation of MB using β-NaYF4:Yb3+, Tm3+/ZnO particles as photocatalyst under irradiation of simulated sunlight without UV light showed photocatalytic activity of β-NaYF4:Yb3+, Tm3+/ZnO could be driven under irradiation of NIR light.
Research on Driving System of Hydraulic Robot Based on Ferrofluid
Authors: Li Jun-Long , Liu Li-Na , Gao Yu-Hong 
Published: December 2019

Abstract
In the driving system of hydraulic robot, the mechanical components are large and complex due to some factors such as material performance and structural design. Based on the magnetorheological properties of ferrofluid, a novel hydraulic driver method is presented based on the principle of jet pipe servo valve. Adding a magnetic field in the air field of the valve body directly controls the deflection and offset of the ferrofluid, and realizes the directly control from the electric/magnetic to fluid. The mathematical model of ferrofluid flows in the air field under magnetic field is established based on the ferrohydrodynamics(FHD).The experimental results show that the millimeter-level deflection has met the actual engineering needs of the hydraulic driving system.
Fatigue damage evolution and finite element simulation of the samples under different notch morphology
Authors: Wang Zhiqiang , Huang Xiaoguang 
Published: December 2019

Abstract
Based on the theory of continuous damage mechanics and the principle of irreversible thermodynamics, the damage evolution model of low cycle fatigue is investigated. By programming the damage evolution model as UMAT subroutine in ABAQUS, the fatigue damage and crack initiation life of notch materials under specific loads are simulated, and the crack initiation location is determined. Furthermore, the effects of root radius, depth and opening angle on crack initiation life are investigated. The results show that the crack initiation occurs easily in the notch root where the damage is the most serious and the plastic strain accumulates fastest under cyclic loading. With the increase of notch depth and root radius, the crack initiation life decreases. For V-notched specimens, when the notch depth remains unchanged, the crack initiation life will decrease with the increase of the opening angle.
Effect of pre-deformation on the mechanical properties of pre-aging AA7093
Authors: Wang Nan , Zhuang Linzhong , Zhang Jishan 
Published: December 2019

Abstract
To improve the mechanical properties of T6 AA7093, this work investigated the effect of 4% pre-stretching on mechanical properties of the 20 min pre-aging AA7093. The results show that after taking 20 min pre-aging + 4% pre-stretching treatment, the hardness of AA7093 reached the peak after taking 9 hours aging. The yield strength and ultimate tensile strength of the pre-aging + pre-stretching + re-aging AA7093 are 631 MPa and 665 MPa, respectively. Comparing with T6 AA7093, the increase of yield strength and ultimate tensile strength are 75 MPa and 29 MPa, respectively. Kinetic analysis of DSC shows that the activation energy of precipitates in T6 and pre-aging and pre-aging + pre-stretching AA7093 alloys are 216.6 kJ/mol and 129.6 kJ/mol, respectively, this results in easier nucleation and growth of precipitates after pre-deformation. TEM shows a lot of precipitates generated on dislocations in pre-aging + pre-stretching + re-aging alloy, a lot of dislocation plugs generated by pre-deformation and precipitates will impede dislocations slip is the main reason that the yield strength of it is higher than T6 AA7093.
Preparation of the nafion/CNT nanofibers via electrospinning
Authors: Li Shufeng , Luo Ru , Huang Jinrong 
Published: December 2019

Abstract
In this paper, we report the preparation of the Nafion/CNT nanofibers via electrospinning. PEO was added as carrier polymer to enhance the chain entanglements and therefore the electrospinnabilities of the nafion solution. Effects of the molecular weights of PEO on the electrospinnability were investigated. Three CNT samples, the CNT, CNT-150 and CNT-500 obtained from the ball-milling of the CNTs, were used and their particle size distributions were analyzed. Dispersions of the CNT, CNT-150 and CNT-500 in water and absolute ethanol were evaluated. Hexadecyl trimethyl ammonium bromide (CTAB) was used to disperse the CNT to single particle. The CNT-500, with the lower average particle size of 298.2 nm and the PDI of 0.167, shows the best dispersion in water and ethanol solution. The nafion/CNT-500 nanofibers were prepared via electrospinning by adding PEO and have better electrospinnability and morphologies.
The oxidation properties of MgF2 particles in hydrofluorocarbon/air atmosphere at high temperatures
Authors: Huang Jie , Chen Hukui , Jiang Hongli , Mu Xiaxia , Yu Jiang 
Published: December 2019

Abstract
The high temperature oxidation properties of magnesium fluoride powders in the atmosphere of air containing hydrofluorocarbon (HFC-134a) were characterized by EDS, SEM, XRD, and gravimetric analyses. The results showed that the oxidation property of magnesium fluoride powder was related to the concentration of HFC-134a, temperature and reaction time. With the concentration of HFC-134a decreasing, the temperature rising and the reaction time prolonging, the extent of magnesium fluoride oxidation increased. This result is great significance for further study of the protective theory of fluorine-containing gases on Mg and its alloys.
Signal Light Ptimization based on PTV Vissim Software
Authors: Lu Mingyu , Yan Sun 
Published: December 2019

Abstract
This paper conducts on-the-spot investigation on the traffic flow of each entry and exit road during the early peak period of the case intersection, and uses the data obtained from the survey to make accurate calculations to obtain the capacity and delay time of the current intersection, and then use PTV Vissim. The simulation software simulates the real-time road condition reduction simulation of this intersection.Finally, based on the results of the PTV Vissim simulation software, a more reasonable optimization plan for the traffic light duration configuration of the intersection is proposed, which can make the interlaced area smooth, fastest, and maximize travel efficiency. A new signal optimization solution based on PTV Vissim software can reduce the delay time of the intersection and improve its traffic capacity.
A Research on Vehicle and UAV Routing Problem during Distribution Based on IAMMAS
Authors: Han Ming , Wang Ya-Bin , Chen Xiang , Zhao Xing 
Published: December 2019

Abstract
According to the characteristic of vehicle and unmanned aerial vehicle (UAV) in distribution service, a vehicle and UAV distribution mode were put forward in this paper to further expand the three-dimensional space of distribution, improve the efficiency of distribution and relieve the pressure of distribution personnel. Based on the consideration of real-time road condition, real-time driving speed, maximum driving distance and mixing time windows in distribution practice, a two-stage nested VRPTW model under vehicle and UAV distribution mode was constructed in this paper. A hybrid algorithm of genetic algorithm and adaptive max-min ant system algorithm (GA-AMMAS) was designed to solve the above problems. In addition, the actual road traffic conditions and vehicle actual travel time were added to the heuristic information in this algorithm. Data experiments shows that the vehicle and UAV routing problem can be effectively solved by GA-AMMAS. In addition, compared with GA and ACA, GA-AMMAS shows obvious advantages in quality solution and speed of convergence.