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hessaraki--mahmmod
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Optimal Control of a Stage Structured Prey-Predator Model
,
M.Sc. Thesis
Sharif University of Technology
;
Hessaraki, Mahmmod
(Supervisor)
Abstract
A prey-predator fishery model with stage structure for prey is discusing in this thises. The adult preyand predator populations are harvested in the proposed system. The dynamic behavior of the model system is discussed. It is observed that singularity induced bifurcation phenomena is appeared when variation of the economic interest of harvesting is taken into account. We have incorporated state feedback controller to stabilize the model system in the case of positive economic interest. Fishing effort used to harvest the adult prey and predator population is used as a control to develop a dynamic framework to investigate the optimal utilization of the resource. Simulation results show that the...
Simulation of Retrograde Behavior of Hydrocarbons around the Production Wells in Gas-Condensate Reservoirs
, M.Sc. Thesis Sharif University of Technology ; Pishvaie, Mahmmod Reza (Supervisor) ; Bozorgmehry, Ramin (Supervisor)
Abstract
The hydrocarbon reservoirs with temperature between critical temperature and cricondentherm are called gas condensate reservoirs. The hydrocarbon fluids of gas condensate reservoirs have retrograde behavior, i.e. when the pressure falls below the dewpoint, condensate liquid appears. This phenomenon usually occurs around the production wells, because pressure is typically the lowest in the near-well region.This so-called condensate blockage leads to reduced gas production because the condensate causes a decrease in gas relative permeability.
This phenomenon is difficult to capture in the standard compositional simulators, because well blocks are typically too large. The condensate...
This phenomenon is difficult to capture in the standard compositional simulators, because well blocks are typically too large. The condensate...