Sharif Digital Repository

Block Method approach solving Forward Problem in Electrical Impedance Tomography (EIT) results exact solution if the measurements are done with enough accuracy. Solving Forward problem with this method brings complexity to required calculations and sufficient speed is needed to extract required data in minimum time. In this thesis, 3D model of EIT with Block Method is implemented by means of Digital Signal Processor (DSP) to obtain maximum speed. Program code is written both in MATLAB and Code Composer Studio in efficient way to decrease clock cycles of CPU. Moreover, some part of algorithm is modified and the desired speed is obtained. At the end, two kinds of DSP, Fixed-point (TMS320C6416)... 

Recently complex networks, have been widely used as a model to study the behavior of human brain. By affecting different parts the brain, Neuronal disorders change the structure of functional brain networks. Investigating these changes using different graph theory metrics can be a useful methodology for human brain analysis in health and disease. Alzheimer's disease (AD) is a neural disease causing impairment in different brain activities including memory and cognition.The aim of this study is to construct the functional brain network of 17 AD patients and 17 healthy control subjects at resting state condition and analyzing them using the theory of complex networks in order to achieve a... 

The study of active matter has gathered a great deal of attention in the past decades. The collective behavior of living matter such as the murmuration of the flocks of birds is an example of these systems. In order to study different aspects of these systems, variant models have been studied and change of behavior, phase shift and the existence of multiple phases has been observed.Vicsek model was one of the first models studying these systems, where an aligning pairwise interaction causes the agents to move in the same direction.We investigated Vicsek model by considering an overdamped Langevin dynamics for fewparticle systems. We showed Vicsek model in fewparticle systems induces... 

In this research, circular and elliptic inhomogeneities are modeled using a numerical meshless method named RKPM. A newly developed accurate and simple method called augmented corrected collocation method, which was previously applied in order to model material discontinuities in the framework of classical continuum theory, is used in combination with the penalty method, considering couple stress elasticity and in micro or nano scales for the first time, where the classical continuum theory has certain shortcomings in predicting the behavior of materials. Simulating nano-composites subjected to anti-plane stresses and comparing the analytical and numerical results show that the augmented... 

Today, energy crises and the environmental pollution have become serious problems for the human being. To address these problems, extensive efforts have been made to replace fossil fuels with other clean energy resources such as fuel cells. In the meantime, polymer electrolyte fuel cells are very important as they are now commonly used in the field of transportation, and their importance become even more obvious as we consider the fact that the by-products from electricity production by such cells are simply water and heat. This research studies the efficiency of the polymer called “polysulfone” as an electrolyte fuel cell, which has the above named mechanical thermal and chemical... 

Nowadays, according to increasing development of construction industry in the world especially in the building area, the need to use technology and innovation for fabrication and maintenance of this industry has increased. And this fact becomes apparent that the use of traditional systems of construction isn’t tailored the countries’ requirements anymore. One of the construction industry’s limitations is the restrictions on architectural designs reys. The columns are among the most important components of structure and have a major role in bearing all gravity and lateral loads and transferring them to the foundation. The failure or destruction of the components in the structure under applied...