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Predicting the competitive position of extended gates: The case of inland customs zones
, Article European Journal of Transport and Infrastructure Research ; Volume 18, Issue 4 , 2018 , Pages 433-456 ; 15677141 (ISSN) ; Saffarzadeh, M ; Tavasszy, L ; Fatemi Ardestani, S. F ; Sharif University of Technology
Editorial Board EJTIR
2018
Abstract
The extended gate concept aims to reduce the pressure on international ports by postponing administrative processes from these border gates to inland terminals. At present, this approach is used mainly in the container transport industry in European and Asian ports. In this paper we study an extended gate concept, where inland customs services are made available from all entry points of a country. Our aim is to predict the portion of the current flow through border gates that is diverted to these inland customs zones. We propose a time-series gravity models to predict these changes and estimate the parameters of this model using publicly available data for different cargo groups. The focus...
Pricing and quality setting strategy in maritime transportation: Considering empty repositioning and demand uncertainty
, Article International Journal of Production Economics ; Volume 240 , 2021 ; 09255273 (ISSN) ; Zolfagharinia, H ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Imbalanced international trade and the limited number of containers in the maritime transportation industry have resulted in considerable costs and decreased profits for shipping firms. To manage these issues, this study utilizes price management techniques to control empty container repositioning in a transportation system. In this system, there is a firm providing transportation services between two ports in both directions. Each direction has its own uncertain potential demand that can be affected by the prices and the quality set by the firm. We develop a mathematical formulation to set the quality and prices of the service in order to maximize the firm's profit. Due to demand...
The numerical investigation of the heat transport in the nanofluids under the impacts of magnetic field: applications in industrial zone
, Article Mathematical Problems in Engineering ; Volume 2021 , 2021 ; 1024123X (ISSN) ; Khan, U ; Ahmed, N ; Mohyud-Din, S. T ; Khan, I ; Fayz-Al-Asad, M ; Sharif University of Technology
Hindawi Limited
2021
Abstract
The dynamics of the nanofluid flow between two plates that are placed parallel to each other is of huge interest due to its numerous applications in different industries. Keeping in view the significance of such flow, investigation of the heat transfer in the Cu-H2O nanofluid is conducted between parallel rotating plates. For more significant results of the study, the squeezing effects are incorporated over the plates that are electrically conducting. The nondimensional flow model is then treated analytically (VPM), and the results are sketched against the preeminent flow parameters. The remarkable heat transfer in the nanofluid is noticed against the Eckert and Prandtl numbers, whereas the...
The numerical investigation of the heat transport in the nanofluids under the impacts of magnetic field: applications in industrial zone
, Article Mathematical Problems in Engineering ; Volume 2021 , 2021 ; 1024123X (ISSN) ; Khan, U ; Ahmed, N ; Mohyud Din, S. T ; Khan, I ; Fayz Al Asad, M ; Sharif University of Technology
Hindawi Limited
2021
Abstract
The dynamics of the nanofluid flow between two plates that are placed parallel to each other is of huge interest due to its numerous applications in different industries. Keeping in view the significance of such flow, investigation of the heat transfer in the Cu-H2O nanofluid is conducted between parallel rotating plates. For more significant results of the study, the squeezing effects are incorporated over the plates that are electrically conducting. The nondimensional flow model is then treated analytically (VPM), and the results are sketched against the preeminent flow parameters. The remarkable heat transfer in the nanofluid is noticed against the Eckert and Prandtl numbers, whereas the...
Evaluation of low strain rate constitutive equation of 7075 aluminium alloy at high temperature
, Article Materials Science and Technology ; Volume 27, Issue 6 , 2011 , Pages 1067-1072 ; 02670836 (ISSN) ; Karimi Taheri, A ; Sharif University of Technology
2011
Abstract
The 7075 aluminium alloy is one of the most important engineering alloys utilised extensively in aircraft and transportation industries due to its high specific strength. In the present research, the flow behaviour of this alloy has been investigated using hot compression test at strain rates of 0.001, 0.01, 0.1 and 1 s-1 and temperatures of 350, 400 and 450°C. The results reveal that dynamic softening occurred in these temperatures and strain rates. The activation energy, strain rate sensitivity and two constitutive equations (hyperbolic sine law and the power law) are derived from the results. It is shown that the hyperbolic sine law has a better agreement with the experimental results
Grid modernization for enhancing the resilience, reliability, economics, sustainability, and security of electricity grid in an uncertain environment
, Article Scientia Iranica ; Volume 23, Issue 6 , 2016 , Pages 2862-2873 ; 10263098 (ISSN) ; Fotuhi Friuzabad, M ; Sharif University of Technology
Sharif University of Technology
2016
Abstract
This paper reviews the merits of modernizing the power grid and discusses the way electric utilities in various countries are directing their practices toward offering enhanced sustainability, reliability, resilience, security, and economics to their respective consumers. The modernization of the electricity grid, which has evolved as the brainchild of electricity restructuring, has been made all the more urgent by the virtually pervasive dependence of modern lives on a reliable, clean, and secure supply of affordable electricity. The electric utility industry restructuring, which has staged many institutional, regulatory, and business models, has enabled the modern electricity grid to take...
Solving bus terminal location problems using evolutionary algorithms
, Article Applied Soft Computing Journal ; Volume 11, Issue 1 , 2011 , Pages 991-999 ; 15684946 (ISSN) ; Mahdavi Amiri, N ; Sharif University of Technology
Abstract
Bus terminal assignment with the objective of maximizing public transportation service is known as bus terminal location problem (BTLP). We formulate the BTLP, a problem of concern in transportation industry, as a p-uncapacitated facility location problem (p-UFLP) with distance constraint. The p-UFLP being NP-hard (Krarup and Pruzan, 1990), we propose evolutionary algorithms for its solution. According to the No Free Lunch theorem and the good efficiency of the distinctive preserve recombination (DPX) operator, we design a new recombination operator for solving a BTLP by new evolutionary and memetic algorithms namely, genetic local search algorithms (GLS). We also define the potential...