Conceptual Design of a Turboexpander Impeller

, M.Sc. Thesis Sharif University of Technology Zangene, Farzane (Author) ; Ghorbanian, Kaveh (Supervisor)

Abstract

Turboexpanders are gaining on interest in power generation as an alternative to Joule Thomson valves. The focus of this thesis is on the conceptual design of the impeller in a turboexpander. First, a one-dimensional design and analysis code is developed by employing the approach given by Aungier. The results are compared with some numerical as well as experimental data. Then, the blade aerofoil profile is generated by incorporating Hasselgruber’s methodology. The results are simulated by utilizing Bladegen and Turbogrid software. An analysis is performed in the CFX environment. The aero-thermodynamic results of the designed impeller of interest are compared with experimental data. An overall...

Stationary Solutions of Semilinear Differential Equations Driven by Fractional Brownian Motions

, M.Sc. Thesis Sharif University of Technology kianpour, Mojtaba (Author) ; Zohori Zangene, Bijan (Supervisor)

Abstract

Let (X; d) be a metric space and (X;) be a partially ordered Space. Let F, g be measurable mappings such that F has g-monotone property and satisfying in a contraction condition. Firstly, some extentions of Banach fixed point theorem was investigated in particular way that lead to random coupled and random fixed point for mentioned mappings. Then, linear stochastic evolution equation and semilinear dissipitive stochastic evolution equation driven by infinite dimentional fractional Brownian noise was evaluated. It has been shown these equations define random dynamical systems with exponentially attracting random fixed points that are stationary solution for them

Radar Directional Finding by Interferometric Method in 2-18 GHzBW

, M.Sc. Thesis Sharif University of Technology Pournadim, Hamid Reza (Author) ; Farzane, Frohar (Supervisor) ; Pezeshk, Amir Mansor (Co-Advisor)

Abstract

One of the important jobs of ESM and Elint receiver is to find the direction of arrival of the targets. Also DOA estimation has applications in guiding missiles and jammers location, position finding using of multiple DF systems which are placed in different locations is the most important use of this type of system.
A DF system has multiple parts: receiver, algorithm and arrays of antennas.
Amplitude comparison algorithms are more simple but on the other hand phase comparison algorithms prepare more accurate estimation. In this thesis these algorithms are simulated and to each other. And it will be concluded that, in the application being test, the "MUSIC" algorithm is the best....

Comparative Examination and Preparation of Polymeric Hydrogels in Order to use as Cellular Scaffold

, M.Sc. Thesis Sharif University of Technology Nazaripouya, Amir (Author) ; Alemzadeh, Iran (Supervisor) ; Sharifi Aghdas, Farzane (Supervisor) ; Mashayekhan, Shohre (Supervisor)