Sharif Digital Repository

This thesis proposes a probabilistic framework to increase situational awareness about serviceability of infrastructure systems, and extend and distribution of losses in the posthazard state of communities. Maintaining situational awareness is the first and foremost step in prioritizing search and rescue operations and organizing resources. This is a challenging task due to the uncertainties that exist in infrastructure systems’ performance after occurrence of a hazardous event. These uncertainties gradually diminish as further information is received. Therefore, a probabilistic framework is the necessary element for disaster management. This framework must be able to update initial beliefs... 

In this thesis, Silicon nanowires were synthesized using carbothermal method via Vapor-Liquid-Solid mechanism catalyzed by gold nanoparticles deposited on various substrates. Silicon nanowires just grew on (100) and (111)-oriented silicon substrates. For a particular set of process parameters, we observed a critical thickness of the nucleating gold film, that had depened on a kind of various substrates. We studied the dependence of the Au-Si alloy droplet size and size distribution on the starting gold film thickness and the annealing conditions. We used a modified heating sequence that deconvoluted the effect of various substrates consumption and gas-phase silicon supply on the Au-Si alloy... 

At this project, at first step has been tried to solve the flow over a plate using unsteady vortex lattice method that reached to this purpose considering reference [5] and using available code at this book. And due to existent limitations of above code, has been tried to promote it to more complex three-dimensional modes. And at next step, the code has been approved using Wagner and Theodorsen theoretical methods and then the results validated with others results. Finally, after confidence of numerical results of the written code, has been studied the effect of design parameters on the Ornithopter aerodynamics parameters to can reach to final purpose that is optimum aerodynamic shape for... 

Micro Combine Heat and Power (Micro CHP) systems are one of the most important devices for energy saving that produce heat and power with the use of natural gas or other fuels. This research presents technical and economical feasible study of using Micro CHPs in different climatic zones of Iran. In order to economic studies in different climates of Iran, these zones are categorized in to five; Tehran, Rasht, Bandar Abase, Ardebil and Yazd, based on weather condition. Specifications of each zone, such as heating and cooling degree days and other parameters that are required for estimating energy consumption is determined. The calculation of energy consumption has been conducted based upon... 

Spatiotemporal photonic crystals (STPCs), which exhibit periodic variations in both space and time simultaneously, have recently attracted increasing attention, although only limited numerical investigations have been conducted on them so far. These structures demonstrate a variety of unique phenomena such as simultaneous energy and momentum bandgaps, nonreciprocity, frequency comb generation, parametric amplification, and instability. However, there remains a strong need for precise analytical studies and intuitive, interpretable band structure models for these media. Accordingly, the primary objective of this thesis is to perform a fully analytical investigation of spatiotemporal photonic...