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Design and Implementation of a Low-Noise Transimpedance Amplifier for Homodyne Optical Receivers
, M.Sc. Thesis Sharif University of Technology ; Medi, Ali (Supervisor)
Abstract
Nowadays, the need for ultra high speed devices in data transmission is much more of concern than a decade ago. High speed microprocessors and memories have made the data transmission the bottleneck of the increase of the overall speed of the systems. Fiber optics has gained especial popularity among all mediums for data transmission, due to their large band-width and low loss. Designing electronics devices which must be used with these ultra high bandwidth mediums is the main concern of the designers, as they should satisfy the low noise and high gain requirements of fiber optic communications. The goal in this M.Sc. project was designing and implementation of a low noise and high gain...
Seismic Performance Assessment of Bridges Equipped with Shape Memory Alloy Added Base Isolation Bearing
, M.Sc. Thesis Sharif University of Technology ; Rahimzadeh Rofooei, Fayyaz (Supervisor) ; Jahanshahi, Mohsen (Co-Advisor)
Abstract
Seismic performance analysis is conducted for an isolated three-span continuous highway bridge, which is restrained with shape memory alloy bar. Two series of earthquake ground acceleration, known as ‘pulse records’ and ‘non-pulse records’ are applied to the bridge in three directions. Four types of pier-girder connection are used in the analysis: rigid connection (only for comparison), lead rubber bearing system (LRB), lead rubber bearing along shape memory alloy (SMA) restrainer system and high damping rubber bearing (HDRB) system. SMA bar restrainer is made of Ni-Ti. In the first step of the work, structural properties and analytical models of the bridge segments are introduced. Then, a...