Loading...
Search for:
zameni-ghalati--saeideh
0.048 seconds
Simulation of Vertical Axis Tidal Turbine and Surrey of the Factors Affecting its Efficiency Applying CFD
, M.Sc. Thesis Sharif University of Technology ; Saeedi, Mohammad Hassan (Supervisor) ; Abbaspour, Majid (Supervisor)
Abstract
Increasingenergy requirements, limitedfossil resources, environmental pollutioncaused byfossilfuels, global warmingand other factorshaveled tothe approach ofscience and technologyfor renewable energies. One of the renewable energies is the energy relevant to ocean currents that is mainlydue to theinteractionbetween thetidalattraction ofthe moon,sun andearth. In our country,due tothehigh tideon the southern coast, there isgood potentialto use thistype of energy. One of themost favorableareasformarinecurrentpower plantslocated inthe northern part ofthe islandof Qeshmchannel.In this thesis,to exploitthis potential, the newidea ofHunter tidalturbine was investigated,because...
Assessment of Fault Effect on Tunnel Stability Under Seismic Load by UDEC Software (Case Study: Shibli Tunnel)
,
M.Sc. Thesis
Sharif University of Technology
;
Sadaghiani, Mohammad Hossein
(Supervisor)
Abstract
Dynamic design of underground structures is complicated and difficult. Although underground structures are less vulnerable than surface structures, dynamic analysis of these structures during their design process is necessary. In this project, numerical studying of fault effect on underground structures and its dynamic responses, focusing on tunnel Shebli was conducted. Two-dimensional model utilizing UDEC software which is based on descrete elements method was used for this analysis. Time history of Manjil Earthquake using horizontal component of ground acceleration which is propagated toward earth surface was applied to models as a shear wave with respect to depth and type of rock. To...
Magnetic dual chiral density wave phase in rotating cold quark matter
, Article Physical Review D ; Volume 108, Issue 5 , 2023 ; 24700010 (ISSN) ; Sadooghi, N ; Sharif University of Technology
American Physical Society
2023
Abstract
The effect of rotation on the formation of the magnetic dual chiral density wave (MDCDW) in a dense and magnetized cold quark matter is studied. This phase is supposed to exist in the extreme conditions prevailing, e.g., in a neutron star. These conditions are, apart from high densities and strong magnetic fields, a relatively large angular velocity. To answer the question of whether the rotation enhances or suppresses the formation of this phase, we first determine the effect of rotation on the energy dispersion relation of a fermionic system in the presence of a constant magnetic field and then focus on the thermodynamic potential of the model at low temperature T and finite chemical...
On endurance of erasure codes in SSD-based storage systems
, Article Computer Architecture and Digital Systems (CADS), 17th CSI International Symposium on ; Article number 6714239 , 2013 , Pages 67-72 ; 9781479905621 ; Miremadi, Gh. (Sayyed Ghassem) ; Asadi, H. (Hossein) ; Sharif Univesity of Technology
2013
Abstract
The wear-out of flash-based Solid-State Drives (SSDs) is a main concern that significantly affects their reliability. One major parameter that accelerates SSD wear-out is the number of write-cycles committed to flash chips. The number of write-cycles in SSD-based disk subsystem is highly dependent on the erasure code implemented in Redundant Array of Independent Disks (RAIDs). In this paper, we investigate the impact of erasure codes and the configuration of storage subsystems (i.e., the number of disks participated in the RAID array and stripe unit size) on the endurance of storage systems. The number of write-cycles is considered as a metric to evaluate the endurance of storage system. We...
Analysis of C-2C DAC Mismatch Effects in SAR ADCs
, M.Sc. Thesis Sharif University of Technology ; Sharif Khani, Mohammad (Supervisor)
Abstract
Analog to digital converters is one of the main building blocks of today's circuits. These circuits play an important role in signal processing. Since these circuits consist of analog and digital sections, a large percentage of the power consumed in a circuit is allocated to this section. Therefore, in applications such as medical devices, wearable applications and wireless technology where power control is very important and necessary, reducing the power of analog to digital converters is very important. One of the simplest analog-to-digital converters from the design point of view is Successive Approximation Register (SAR) analog-to-digital converters. This type of analog-to-digital...
Numerical Simulation of Al-Si Alloy Fatigue Behavior under Thermo-Mechanical and Isothermal Loads
, M.Sc. Thesis Sharif University of Technology ; Farrahi, Gholamhossein (Supervisor) ; Asghari, Mohsen (Co-Advisor)
Abstract
The main purpose in this thesis is the finite element simulation of the stress-strain behavior in an aluminum-silicon-magnesium alloy, subjected to low cycle fatigue and thermo-mechanical fatigue loadings. This finite element modeling is performed in the ABAQUS software. Two time-dependent and time-independent models are used to simulate the behavior of the material. The time-independent model is the combined nonlinear isotropic/kinematic hardening model, which predicts the mean stress relaxation behavior, the cyclic softening or hardening and the translation of the yield surface, while it ignores the effect of the strain rate. Time-dependent models include Johnson-Cook and the two-layer...