Sharif Digital Repository

Up to now, many seismic design methods and construction technologies have been investigated to reduce the seismic responses of bridges, buildings and potentially vulnerable structures. [1] Introducing a new effective systems aim to control of vibration caused by earthquake on the structures will be useful. This system is based on repelling of imposed force to the structures with tuned mass dampers (TMDs), to gain minimum damage. The detuning of the structures by equipped with TMDs resulted from nonlinear behavior due to dynamic loads such as strong ground motions are real concern in the practical applications. The application of TMDs, as expected, can reduce the deformation of the... 

Ramp merges are among high potential congested sections of freeways. On-ramp driver behaviors are often complicated. Traffic models for freeway merges are often based on gap acceptance theory and lane changing models. Gap acceptance theory states that drivers merging from on-ramp to freeway, seek acceptable gaps to merge into freeway. Both lead and lag gaps should be acceptable for a driver to merge to freeway.
In this research, drivers’ behavior in two on-ramps of Tehran city was studied. After field data collection using camera, data were extracted from films. First, distribution of time headways in freeway right lane and gaps between merging vehicle with lead and lag vehicles were... 

Using the achievements of differential geometry an extended form of descent equations is worked out which leads to a set of modified consistent anomalies. A gauge invariant partition function is also defined for gauge theories with the standard quantization results. It is shown that the (extended) descent equations and consequently the (modified) consistent anomalies and Schwinger terms can be extracted from this modified partition function naturally. Moreover Translation-invariant products are discussed in the setting of α-cohomology and it is shown that loop calculations of Translation-invariant quantum field theories are entirely determined by α-cohomology class of star product in all... 

In this thesis, I am going to review an introduction of scattering amplitude as a recently hot subject.First of all, I will introduce spinor representation and its applications to calculating scattering amplitudes. After that, I will focus on the MHV amplitudes as an Impressive part in simplifying scattering amplitudes. Then, I am going to speak about CSW and BCFW; some powerful toolkits in calculating scattering amplitudes of Yang-Mills theories, and I will show the power of these methods in simplifying the complexities in scattering amplitudes. Finally, I am going to speak about the amplitudes and super amplitudes in N=4 Super Yang-Mills theories and we will touch their amazing simplicity... 

This study wants to analyze the effects of the banking system on the transmission of monetary policy and its impact on wealth inequality. We use a continuous time heterogeneous framework with heterogeneity for households and capital producers. The model is an extended version of a two-asset heterogeneous agent New Keynesian model with heterogeneous capital producers and a bank with liquidity transformation. The production block consists of a final-good producer, intermediate-good producers, and capital-good producers. Capital good producers could get loans from the bank but have a borrowing constraint. We found that a) an expansionary monetary policy increases the issued loans, which leads... 

Due to the global crisis of water and energy scarcity, the design and optimization of water treatment systems with the aim of reducing energy consumption and increasing efficiency have gained significant importance. An electrodialysis system was simulated and validated using advanced lumped model, considering all critical effects in the process, such as Donnan resistance, boundary layer resistance, and osmotic and electroosmotic flows, across salinity ranges from 0.35 to 200 parts per thousand. Additionally, a reverse osmosis desalination system was simulated and validated using the solution-diffusion model, with the concentration polarization coefficient calculated via the thin-film theory.... 

In this Thesis we study the string theory discription of non-relativistic quantum ?eld theories.In other statement we study the duality between gravity and gauge theory with non-relativistic symmetry.We discuss that this duality works in non rel- ativistic sense.We study two kind of non-relativistic theories that one of them camefrom string theory and other model obtained by special transformation of original relativistic theory and we see that how duality can be work for these models.Also dual picture of semi-classical string in the background that found from string theorystudied.We also study the motion of particle in a hot plasma and we ?nd a sign of non-relativisic duality really works  

Jets originating from bottom (b) quarks, play an important role in the study of Standard Model processes together with the search for new physics. In the CMS experiment a considerable e?ort is dedicated to the development and the performance study of so-called b-tagging algorithms. On the other hand, the top quark which is produced in pair (tt¯) with a high rate at the LHC, decays near 99% of the time to a b-quark. Hence it provides a rich source of b-quark jets, suitable for b-jet identi?cation studies. In this thesis, a fully data-driven method to measure the b-tagging e?ciency, using top quark events in its semi-electron ?nal state, is developed. The results of the application of the... 

In this thesis at ?rst, we review the magnetic monopole with andwithout electric charge in the ?at and also in the curved space and wereview the multimonopoles with axial and crystalline symmetry. In thisthesis also we review the holography principle and AdS/CFT duality andthe holographic renormalization. as the main part of the thesis the Julia-Zee dyon is studied in the context of AdS/CFT correspodence. We showthat for a solution of the dyon, the scalar ?eld in the model plays the roleof an order parameter. At high temperatures the vacuum expectationvalue of the dual scalar operator is zero and by lowering the temperature,it becomes nonzero and dual ?eld theory experiences a phase...