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Dynamic Performance Simulation of a Turbofan Engine with Inlet Flow Distortion
, M.Sc. Thesis Sharif University of Technology ; Ghorbanian, Kaveh (Supervisor)
Abstract
Turbofan engines are widely employed as the propulsion unit in commercial aircrafts. Turbofan engines may experience inlet flow distortion during their operation which may alter the performance magnitude and stability of the engines. In this research, an object-oriented (modular) model for turbofan engine components is developed by using Simulink/Matlab. Through the integration of the 1D models and the related thermodynamic equations for the engine components, the engine design point is determined. The off-design performance matching across the different components is established by scaling the characteristics and incorporating matrix iteration method. The spool dynamics is used to simulate...
Modeling the Impact of Climatic Conditions on Geometric Variations of Railway Tracks: A Deep Learning Approach
, M.Sc. Thesis Sharif University of Technology ; Shafahi, Yousef (Supervisor)
Abstract
Climate conditions are one of the key factors influencing railway infrastructure, and future climate changes and the occurrence of extreme weather events increase the risks to the sustainability and performance of these infrastructures. In this study, the relationship between climate conditions and geometric degradation of railway tracks in Iran is investigated using deep learning models. Geometric data of railway tracks from the EM120 track recording machine over a 14-year period were combined with meteorological data including temperature, humidity, precipitation, and wind speed for all 19 railway regions in Iran (covering approximately 14,000 kilometers of track and 180 GB of data)....
Deriving the Cost Function and Optimal Boundaries for a Two-level Inventory System with Information Sharing and Identical Retailers
, M.Sc. Thesis Sharif University of Technology ; Haji, Rasoul (Supervisor)
Abstract
In this study we consider a two-level supply chain, with a supplier and a number of identical retailers, demand process is Poisson with random rate. All retailers apply (R,Q) policy with backorder case for their inventory control supplier fulfills the orders of retailers according to FIFO discipline. At any point of time the supplier has online information about inventory position of all retailers.
Whenever the inventory position of a retailer reaches to a fixed value (s) above its reorder point, the supplier orders a batch of size Q to an outside source with infinite capacity. Lead-time of each retailer is equal to the sum of a constant transportation time and a delay time which is...
Whenever the inventory position of a retailer reaches to a fixed value (s) above its reorder point, the supplier orders a batch of size Q to an outside source with infinite capacity. Lead-time of each retailer is equal to the sum of a constant transportation time and a delay time which is...
Estimation and stochastic control of nonlinear dynamic systems over the AWGN channel: application in tele-presence and tele-operation of autonomous vehicles
, Article IET Control Theory and Applications ; Volume 17, Issue 16 , 2023 , Pages 2111-2123 ; 17518644 (ISSN) ; Farhadi, A ; Khaki Sedigh, A ; Sharif University of Technology
John Wiley and Sons Inc
2023
Abstract
This paper is concerned with tele-presence and tele-operation of autonomous vehicles over the Additive White Gaussian Noise (AWGN) channel. This wireless communication channel is subject to transmission noise and transmission power constraint. An encoder, decoder and controller are proposed by implementing a novel linearization method for linearizing the nonlinear dynamic systems at operating points. For the linearized systems, the encoder, decoder and controller are implemented that were previously proposed for output tracking as well as stability of linear dynamic systems. Two novel linearization methods are proposed and their satisfactory performances are proved for output tracking as...
Two new methods for DNA splice site prediction based on neuro-fuzzy network and clustering
, Article Neural Computing and Applications ; Volume 23, Issue SUPPL1 , 2013 , Pages 407-414 ; 09410643 (ISSN) ; Manzuri Shalmani, M. T ; Khaki Sedigh, A ; Kia, M ; Sharif University of Technology
2013
Abstract
Nowadays, genetic disorders, like cancer and birth defects, are a great threat to human life. Since the first noticing of these types of diseases, many efforts have been made and researches performed in order to recognize them and find a cure for them. These disorders affect genes and they appear as abnormal traits in a genetic organism. In order to recognize abnormal genes, we need to predict splice sites in a DNA signal; then, we can process the genetic codes between two continuous splice sites and analyze the trait that it represents. In addition to abnormal genes and their consequent disorders, we can also identify other normal human traits like physical and mental features. So the...
Activated layered manganese oxides with deposited nano-sized gold or silver as an efficient catalyst for epoxidation of olefins
, Article RSC Advances ; Volume 3, Issue 46 , 2013 , Pages 24069-24074 ; ISSN: 20462069 ; Amini, M ; Sedigh, D. J ; Rahimi, F ; Bagherzadeh, M ; Sharif University of Technology
2013
Abstract
Activated layered manganese oxides with deposited nano-sized gold or silver were synthesized and characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction spectrometry, atomic absorption spectroscopy and energy-dispersive X-ray mapping. Here, we report that Au or Ag nanoparticles deposited on layered Mn oxides improve the catalytic activity of the Mn oxides toward the epoxidation of olefins in the presence of H2O2 and NaHCO3
Numerical investigation on the temperature dependence of the cylindrical-gate-all-arounD Si-NW-FET
, Article Modern Physics Letters B ; Volume 25, Issue 29 , 2011 , Pages 2269-2278 ; 02179849 (ISSN) ; Saghafi, K ; Faez, R ; Moravvej-Farshi, M. K ; Sharif University of Technology
2011
Abstract
We report the results of our numerical investigation on the temperature dependence of the characteristics of the cylindrical gate-all-around Si nanowire field effect transistor (Si-NW-FET). Assuming the effect of temperature on the energy band structure of Si just like the effect of strain, we simulate the transistor characteristics at various temperatures (50 K ≤ T ≤ 300 K). In this investigation, we demonstrate the temperature dependence of the transistor sub-threshold swing and the threshold voltage are both linear functions of the temperature, represented by 61.5 × (T/300) + 63.4 (mV/decade) and 220140 × (T/300-1) (mV). By calculating the IDS - T characteristics for VDS = 0.4 V and...
Gold nanoparticles loaded into niosomes: A novel approach for enhanced antitumor activity against human ovarian cancer
, Article Advanced Powder Technology ; Volume 32, Issue 12 , 2021 , Pages 4711-4722 ; 09218831 (ISSN) ; Ferdowsian, S ; Hajrasouliha, S ; Kazempoor, R ; Mirzaie, A ; Sedigh Dakkali, M ; Akbarzadeh, I ; Mohammadmahdi Meybodi, S ; Mirghafouri, M ; Sharif University of Technology
Elsevier B.V
2021
Abstract
In the current study, gold nanoparticles (AuNPs) were prepared using the green synthesis method using Artemisia annua extract, loaded into niosomes, and investigated their cytotoxicity and apoptotic effects. To optimize the niosomal formulation containing AuNPs, the effects of surfactants: cholesterol molar ratio, Span 60: Tween 60 M ratio, and AuNP concentration (µg/mL) were investigated. After examining the drug release profile, mathematical models were assessed to predict release kinetic. The cytotoxicity of noisome encapsulated AuNPs and free AuNPs was evaluated against human ovarian cancer cell line (A2780) by MTT assay. The apoptotic/necrosis ratio was studied using flow cytometry as...