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A New Metaheuristic Algorithm Based on Particle Swarm Optimization for Discrete Time Resource Trade-off Problem
, M.Sc. Thesis Sharif University of Technology ; Kianfar, Farhad (Supervisor)
Abstract
In this research, a new metaheuristic algorithm is developed for solving the Discrete Time- Resource Trade off Problem in the field of project scheduling.In this problem ,a project contains activities interrelated by finish-start type precedence constraints and each has a specified work content and can be performed in different combinations of duration and resource requirement.Since the problem is NP-hard , the Particle Swarm Optimization is adopted due to minimization of the makespan subject to precedence relations and a single renewable resource. Basically PSO is used to solve continous problems and discrete problems have just begun to be solved by the discrete PSO.In proposed method,a...
Flooding numerical simulation of heterogeneous oil reservoir using different nanoscale colloidal solutions
, Article Journal of Molecular Liquids ; Volume 302 , 15 March , 2020 ; Hosseinizadeh, E ; Esfandeh, S ; Sharif University of Technology
Elsevier B.V
2020
Abstract
In this study, flooding of oil reservoir by implementing Nanoscale colloidal solutions as a working fluid is simulated. All oil reservoirs are heterogeneous porous media; therefore, in this investigation for more accurate prediction of the problem, the porous media is considered heterogeneous. The governing equations of this problem are solved by finite element method (FEM). Moreover two-phase equations of Darcy and mass transfer equations are used. In this paper, the effect of temperature and volume fractions of nanoparticles on the rate of oil recovery is investigated. The SiO2, Al2O3, and CuO nanoparticles are used in the enhanced oil recovery (EOR) process. Also, in order to solve the...
A Heuristic Method for Optimization of Node Placement in Wireless Sensor Network
,
M.Sc. Thesis
Sharif University of Technology
;
Hemmatyar, Ali Mohammad Afshin
(Supervisor)
Abstract
As the applications of wireless sensor networks are expanding at an increasing rate, design of these networks so that they conform to the requirements of a specific application is considered to be a major challenge. Regarding to the specific application, network designers consider various suitable parameters to improve and then to enhance the efficiency of the network. Parameters included are such as area coverage, lifetime, reliability and etc which can significantly improve with the precise placement of nodes. Node localization problem in wireless sensor networks aiming at improvement of the performance parameters has been solved by different methods. In this thesis, in order to solve this...
Preparation and Characterization of Composites Based on Natural Fibers
, M.Sc. Thesis Sharif University of Technology ; Shojaei, Akbar (Supervisor) ; Esfandeh, Masoud (Supervisor) ; Rezadoust, Amir Masoud (Co-Supervisor)
Abstract
In this research, coating with polymer solution was considered for improve the surface adhesion of natural jute fibers with polymer matrix. This coating was performed by two polymers, polyurethane and polystyrene, in order to create compatibility between natural fibers and unsaturated polyester resin. Impregnation and coating of fibers were done by dissolving these polymers in a suitable solvent and creating a thin coating on the fibers. 2%, 5% and 10% solutions of each polymer were prepared for impregnating fibers and the pultrusion process of the resulting fibers was performed using unsaturated polyester resin. The polyurethane were not compatible with jute fibers and caused a loss of...