Studying Detection of Exo-Planets by Gravitational Microlensing

, Ph.D. Dissertation Sharif University of Technology Sajjadian, Sedigheh (Author) ; Rahvar, Sohrab (Supervisor)

Abstract

In this thesis first we will review gravitational lensing and microlensing, then we will introduce all direct and indirect methods for detecting exo-planets. gravitational microlensing is one of these methods in detecting exo-planets. In the second part first we will explain a powerful numerical method for calculating magnification, position and the shape of images by combining of tree code and inverse rays hooting algorithm. Then we simulated the caustic crossing of Hot Jupiters using that algorithm. Finally with performing Monte-Carlo simulation we will obtain the detection efficiency for detecting this class of exo-planets during caustic crossing and we will estimate the number of these...

Numerical Simulation of Sedimentation Tanks Using the LES Model

, M.Sc. Thesis Sharif University of Technology Sajjadian, Mohammad (Author) ; Afshin, Hossein (Supervisor) ; Firoozabadi, Bahar (Supervisor)

Abstract

In the present study, hydrodynamics and particle sedimentation of a rectangular basin is studied numerically. Results are also validated with experimental data. Two major goals are perused in this work: First comparing LES and RNG k-ϵ turbulence models and second, investigating the accuracy of simulation of particle sedimentation by solving the concentration formula.
In order to achieve these goals, a 2D sedimentation tank is simulated using the RNG k-ϵ model. Velocity and concentration profiles are also plotted. Comparing the results with experimental data reveals that simulating sedimentation by the mentioned method has acceptable accuracy and can be used to predict sedimentation. In...

Probing the Universe with Gravitational Microlensing

, Ph.D. Dissertation Sharif University of Technology Khalouei, Elaheh (Author) ; Rahvar, Sohrab (Supervisor) ; Sajadian, Sedigheh (Co-Supervisor)

Abstract

Gravitational microlensing is one of the experimental tests to confirm the theory of general relativity. In this phenomenon, the light of the source star is deflected by the gravitational field of the foreground star which plays the role of the lens. As a result of this deviation, images of source star are formed on the sky plane. The observer records the light of the source star as a variable with time. The gravitational microlensing illustrates the possibility to discover extrasolar planets, study the atmosphere of stars, and probe the nature of Dark matter. In this thesis, at first, we introduce the basic concepts of gravitational microlensing and its history. Then by simulation of...

Estimating the Time of Concentration in Small Urban Watersheds (Case Study: Tehran)

, M.Sc. Thesis Sharif University of Technology Ghazizadeh Hashemi, Sedigheh Alsadat (Author) ; Tajrishy, Masoud (Supervisor)

Abstract

Hydrologic analysis in order to design the collection and transmission structures of urban runoff require some time parameters as input that the accuracy of these analysis is directly sensitive to the accuracy of these parameters. Among these parameters, the time of concentration is the most frequently utilized time parameter and numerous equations for estimating the time of concentration in urban watersheds have been proposed. The purpose of this study is to propose some equations to estimate the time of concentration of overland flow in small urban watersheds with pattern similar to arid and semiarid regions and investigate the effect of using LIDs on reducing the surface runoff....

Experimental study and simulation of different EOR techniques in a non-fractured carbonate core from an Iranian offshore oil reservoir

, Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 27, Issue 2 , 2008 , Pages 81-91 ; 10219986 (ISSN) Jafari, M ; Badakhshan, A ; Taghikhani, V ; Rashtchian, D ; Ghotbi, C ; Sajjadian, V.A ; Sharif University of Technology

2008

Abstract

In this research the experimental and theoretical studies on different Enhanced Oil Recovery (EOR) techniques, i.e. Water Flooding (WF), Gas Injection (GI) and Water Alternating Gas process (WAG) were performed on specimens taken from an Iranian carbonate offshore reservoir at the reservoir condition. The experimental results for each specified techniques were compared with the corresponding results obtained from a simulation model. In the case of WF and GI, the injection rates were set to be 0.1, 0.2 and 0.5 cc/min while for the WAG experiments, with two WAG ratios 1 and 2 and with 7, 7, and 10 cycles, the injection rates were 0.1, 0.2 and 0.5 cc/min. The results obtained from the...

Design, Expression, and Evaluation of Nanoparticle Structure Containing Malaria Vaccine Candidate Antigen by Self-assembled Peptide Nanoparticles (SAPNs) and Confirmation of its Antigenicity Using Serum of Malaria Patients

, M.Sc. Thesis Sharif University of Technology Zahedi, Farhad (Author) ; Alemzadeh, Iran (Supervisor) ; Abouei Mehrizi, Akram (Supervisor) ; Sardari, Soroush (Co-Supervisor) ; Zakeri, Sedigheh (Co-Supervisor)

Abstract

Malaria is one of the most important infectious diseases in the tropical and subtropical regions of the world and is caused in humans by the bite of the female Anopheles mosquito of five species of Plasmodium. According to the World Health Organization, about 229 million people worldwide were infected in 2019 by the disease, and 409,000 people died from the disease. Resistance of the parasite against drugs and resistance of vectors to insecticides and larvicides, which prevents the elimination and eradication of malaria, shows the need for new strategies, such as having an effective vaccine against this disease. In the second generation of vaccines, to develop malaria vaccines, recombinant...