JOURNAL OF TRANSPORTATION RESEARCH
Year:2020 | Volume:17 | Issue:1 (62) |Papers Count:17

One of the main reasons for weaknesses in the airport management system or failure in capacity of some parts of the airport is the inability to assess the level of service of those parts, and the lack of information about satisfaction level of passengers from different departments. For proper management requires awareness of the satisfaction of passengers and comparing this information with the standards of world-class airports. The elements were chosen based on Airport Service Quality Department and IATA suggestion at the first. Then there is 3ways to evaluate the elements, evaluate some of them based on authors finding and compare to limited, some of them based on questionnaire according to passengers travel experience, and the rest of the elements, a paired comparison questionnaire based on analytic hierarchy process method is designed. after analysis, prioritization of all the elements are done; so Facilities for disabled passengers and waiting time in check-in control area have the highest importance with 11. 7% and 10. 5%, and shopping centers and restaurants with 2. 4% and 3% have the least importance for future reform.

Fatigue cracking is one of the most common damages in asphalt pavements. Hence, fatigue performance of asphalt mixtures is one of the most important parameters of the mixing design and structural design of pavements which ignoring it, leads to the existence of crack, rutting, and failure of the asphalt procedure. in this study, fatigue shot test was carried out to predict the fatigue behavior of mixtures containing steel slag or fatigue beam test using four-point loading in the constant strain mode at two levels of strain 600 and 800 micro strain, with a sinusoidal wave and frequency of 10 Hz. in this project, the addition of coarse and fine aggregates of coarse aggregate, fine-grained and all of aggregates was observed in the comparison that steel slag mixtures generally have more fatigue life than the observed mixtures, and the mixture containing fine steel slag aggregates have the highest fatigue life.

The purpose of this study assessing the competitiveness of tourism in the Middle East Due to the Air transport infrastructure, land and port and tourism services. This assessment is done in two steps. First, country scores are calculated separately in each infrastructure using the Promethee model. Second, the overall situation of countries is calculated and the rates achieved in 2015 and 2017 are compared. The research findings showed the land and port infrastructure is better than the infrastructure of the air transportation and tourism services infrastructure in the Middle East. The findings also suggest that Except for Cyprus, all of the studied countries have had a steady upward trend in the development of transport infrastructure and tourism in comparison to 2015. However, only the United Arab Emirates, Turkey, Saudi Arabia and Qatar are in a good position. The United Arab Emirates has been at the forefront of the Middle East Transport and Tourism Infrastructure for both. The output of this research can provide a strategy for tourism development planners in the Middle East and especially Iran.

One of the most important goals of a pavement management system is determination of optimal priorities and time for repairs, through prediction of pavement status. In fact, the purpose of the PMS system is to repair and maintain the early stages of cost savings and savings. . Therefore, in this study, in order to determine the Pavement Condition Index (PCI), two linear regression models and back propagation neural network models were fitted and their power estimates were compared. In this regard, the damages of three freeways of Karbala, Paul Zal and Tehran-Qom have been studied to identify the appropriate method for predicting pavement status index in order to identify the optimal maintenance time to reduce its costs. . Micropaver software and MATLAB and SPSS software were used for modeling and evaluation of components. This track was sampled in order to capture the failure of sample units at 100 m intervals and parts at 500 m intervals. The variables considered in the model analysis included: segment lifetime at inspection time (month), unit width, average AADT at segment lifetime, average percentage of heavy vehicles at segment lifetime, maximum temperature at segment lifetime in 1396, minimum Temperature is the lifetime of the piece in 1396 and the thickness of the pavement (cm). . The results show that the performance of neural network model based on mean square error index (MSE) as well as R2 index is 0. 95 and 0. 87, respectively, which is more valid than the multiple linear regression model (0. 139). The future is paved. In addition, according to the neural network model, the lifetime of the segment can be most important in neural network construction (0. 55) and then maximum temperature (0. 122) and percentage of heavy vehicles (0. 120) are the next important variables in predicting pavement status of roads.

In this article with simulation of Tehran subway second type rolling stock, dynamic performance of this train has been studied. Dynamic simulation of Tehran subway has been simulated in UM (universal mechanism) package. At first train bogie parts has been drawn in 3D software package Solid works and moment of inertia and mass of each part has been extracted. In Solid works software the bogie part has been attached and complete model of bogie imported to Dynamic simulation software. In Dynamic simulation of Tehran subway rolling stock, primary and secondary suspensions were differ from conventional bogies that has been used in Iranian railway and simulation should be done exactly. After this work dynamic simulation has been done for hunting speed of wagon and acceleration of wagon body has been obtained in vertical and lateral directions. with the result that has been extracted from dynamic performance of train, the effect of hunting speed on lateral wheelset lateral displacement and angle of attack in left wheel of first wheelset has been comprised. ride index criteria for calculation of Tehran subway has been explained. for simulation of train, track irregularity inputted in UM software for ride index has been calculated in lateral and vertical directions. According to secondary suspension of Tehran subway train body acceleration and ride comfort of this train simulated. According to ride comfort result of this train, the result of Tehran subway rolling stock has been compared with standard value.

Road transport as one of the factors of affecting economic, Displacement of goods and passengers, areas of access to facilities and national welfare increases and Investment in this sector as a key factor, determining a critical role in the road transport sector is growing. Therefore, the transitional capital of the department of road transport and the changes is important in this section and Understanding of the quantitative and qualitative, decision-making and planning in the road transport sector in the macro and micro levels, is important. The objective of this paper is Estimate of production function in the Iran's road transport sector using Translog production function during years of 1974-2011. The results show that if a percent Capital stock Increase, the value added of road transport will grow 0. 17 percent. Partial elasticity of Labor is 0. 54 that show increasing a percent in labor of road transport increased value added of road transport to 0. 54. Another effective variables on factors of production in the Iran's road transport sector is energy consumption that has a positive impact and the effect is 0. 22 that Show increasing a percent in energy consumption of this sector, increased value added of road transport to 0. 22.

This paper aims to evaluate the effects of Bentonite on various properties of hot mix asphalt (HMA). The Bitumen was modified with 10%, 15%, 20%, 25% and 30% Bentonite by weight of Bitumen as modifier. In this study the mechanical properties and performance characteristics of modified asphalt concrete were evaluated through various laboratory tests, such as Marshall Stability, resilient modulus, moisture susceptibility, permanent deformation. The performance characteristics evaluated in this study included permanent deformation test and rutting resistance. The test methods used in this evaluation were the dynamic creep test and wheel tracking tests. The results demonstrated that the use of Bentoite can enhance Marshall Stability, resilient modulus, tensile strength, resistance to moisture damage and resistance to permanent deformation of mixtures. The mixtures also showed good resistance to permanent deformation evaluated by means of wheel tracking tests.

Creating an optimal portfolio for projects is one of the main issues discussed in the projects portfolio management. Selecting the right portfolio projects guarantees the excellent performance of the project portfolio management and the organization mission achievement becomes more probable if this combination is chosen more suitably. A bi-objective model is proposed in this research based on the strategic goals, cost and the time for the optimal selection of the projects portfolio which, by being solved, leads to obtaining a suitable combination of the projects for achieving the maximum value of strategic goals with the minimum cost in the determined time horizon. Different sections of the Iran Railways Company should select and manage their investment for achieving the strategic goals in the 2021 horizon and wisely choose and execute their projects, one of the most important sections of the Iran Railways Company is the signaling and telecommunication section, in where 120 projects are defined. This model was implemented on 120 projects of the signaling and telecommunication section of the Iran Railways Company and after solving, 81 projects were chosen and scheduled in a way that the Iran railways Company will have the minimum distance with its strategic goals with the minimum cost until the end of 2021.

Paying attention to the effective causes of pedestrian safety is one of the components of urban transportation. Non-signalized intersections are considered a place with having high levels of risk because of happening many different conflict situations between vehicles and pedestrians. In this paper, the variables which are influential on the pedestrian safety based on the Post Encroachment Time are assessed. Such an assessing is done by linear regression models. For this purpose, the data was extracted observing a non-signalized intersection in Tehran called Vesal Shirazi-Bozorgmehr. The results demonstrate that the variables such as the vehicle, being a taxi and the pedestrians having unusual stops are effective in PET, having coefficients-0/08 and 0/38 respectively in 95 percent of reliability. Also, the number of pedestrians and vehicle's previous conflicts with other vehicles in the physical area of the intersection are effective, having coefficients equal to 0/04 and-0/05 respectively in 90 percent of reliability.

Today, modified bitumen is used in the asphalt pavement, extensively. This has improved the properties of the asphalt mixture, including fatigue failure performance. Beside of these additives effect, a phenomenon called asphalt self-healing also increases the fatigue life of the mixture. Since there has not been extensive research on effect of self-healing, design fatigue life is usually considered to be less than the capacity of the mixture, and this action, in addition to adding cost, affects high temperatures performance or in other words, rutting performance. In this study, modified mixtures containing crumb rubber, styrenebutadiene-rubber, styrene-butadiene-styrene and polyethylene polymers were prepared in two groups of same bitumen and same void ratio and subjected to four-point fatigue and rutting tests. Results showed that SBR elastomer polymer with increased bitumen elasticity provides the highest recovery capability (85%) for asphalt specimens. Subsequently, the SBS polymer has the highest fatigue life and 60% recovery capability.

This paper presents an "integrated asphalt production and distribution planning model” for asphalt plants. The General Algebraic Modeling System (GAMS) used to code this model, different types of input data, such as (Dai) amount of required asphalt for a project, (Capj) plants production capacity, (dtij) distance between plants and projects, (Ctij) transportation costs and (Cpij) asphalt price are used as input model data and most important output result of this model is (Xijt) " amount of asphalt planned to produce and distribute form each plants to each projects in each period of time" that computed using CPLEX Solver. At the end of this paper, a numerical example about asphalt production planning during one year for 20 plants and distribution between 15 construction sites in Khuzestan is given to illustrate how the proposed model can be used.

Increasing the growth rate of container transportation industry in recent decades and predicting the continuation of this growth over the years will highlight the importance of container transport and the key role of containers in maritime transportation. With entering container into transportation area, this area has experienced a huge change. However, the imbalance problem between the input and output containers exists in ports until now. This imbalance between import and export of goods has created a problem called Empty Container. in this paper, investigated the empty containers repositioning problem under Uncertainty. A robust scenario-based approach to risk pooling effect has been used to model the failure of some of the problem parameters under different scenarios. Finally, the computational results indicate the proper performance of the proposed model under uncertainty conditions and the importance of using a robust approach to solving the problem of empty containers repositioning under uncertain conditions.

The study of effective factors in the selection of intra-city trips is one of the important issues in urban planning. So far, adult travel behavior for various purposes has been extensively investigated by transport planners and urban scholars, and many conceptual models have been developed for this purpose, but less attention has been paid to students' study trips. On the other hand, studies have recently been conducted on the selection of travel equipment for students in metropolitan areas such as Tehran and Mashhad, but less attention has been paid to middle cities with less populations and more traditional tissue. In this research, factors affecting the choice of the tool for student trips to the middle city of Ardabil have been investigated. Based on the general census of population and housing in 1395, the population of the city of Ardabil was 529, 374 people in the form of 15, 827 households, of which 14. 8 are from 7 to 13 years (grades one to six), so that 64. 6% of boys and 17. 7% of girls are. In this regard, student's travel data was collected by questioning. In this questionnaire, 600 questionnaires distributed among 496 return questionnaires, 411 questionnaires were used. After the initial analysis of the data, using a multi-logit model with randomized decomposition, modeling was used to select the method of study trips for students in Ardabil city. The results of the studies show that the socio-economic characteristics of the parents of the household have a significant impact on the method of selecting the travel means of the students.

In the past few decades, small ports have lost their regional and national role due to development and growth of major ports of the country and have transformed into local ports. However, these ports have much potential to assist Ports and Maritime Organization to fulfill its long-term perspectives. Port networking is one of the newest ideas developed in leading countries of the maritime transportation industry. In a networking approach, small and large ports can act as performance nodes of the network contributing to the whole system in order to reach the superior goals and outlook. In this research, the focus is on commercial ports of Khuzestan province: Imam Khomeini, Khorramshahr, Abadan, Arvandkenar, Choebdeh, Sajjafi and Shadegan. First, port assessment indicators are defined using Delphi method, considering spatial and economical, multimodal transportation and infrastructures approaches. Then, each port`s specifications are precisely assessed using modified indicators and every port is valued into three levels. Finally, considering common network designs, the most optimum network model is developed for commercial ports of Khuzestan.

The main objective of this study is to mitigate the weaknesses of stone matrix asphalt mixtures by improving their mechanical properties and improving the main advantage of stone matrix asphalt which is high resistance against rutting. In order to accomplish this tasks, Nano-Zeolite and Zeolite Granule were used as warm mix modifiers because of their ability to decrease the temperture of mixtures and also to lower the viscosity and the effects of these materials were evaluated by Indirect Tensile Strength, Tensile Strength Ratio, and Wheel-Track tests. The tests results showed that stone matrix asphalt mixtures were compatible with nano-zeolite and zeolite granule. These mixtures modified by nano zeolite had been shown greater strength in rutting compared to specimens modified by granule. Moreover, granule cuased decrease in indirect tensile strenght in both wet and dry conditions, while the specimens made by nano zeolite showed better performe. Thus they had no significant effect on moisture susceptibility.