Loading...
Search for: soleymani-movahed--farzaneh
0.177 seconds

    Dithiocarbamate as an efficient intermediate for the synthesis of 2-(alkylthio)thiazol-4(5H)-ones

    , Article Journal of Sulfur Chemistry ; Volume 37, Issue 5 , 2016 , Pages 529-536 ; 17415993 (ISSN) Ziyaei Halimehjani, A ; Alaei, M. A ; Soleymani Movahed, F ; Jomeh, N ; Saidi, M. R ; Sharif University of Technology
    Taylor and Francis Ltd  2016
    Abstract
    An effective approach for the synthesis of 2-(alkylthio)thiazol-4(5H)-ones from alkyl dithiocarbamates and chloroacetyl chloride in the presence of NaHCO3 has been developed. Good to excellent yields of products, simple reaction conditions and general applicability are the most important advantages of this protocol  

    Synthesis of New Dithiocarbamate Complexes Based on Diamines Prepard from Cinnamaldehyde

    , M.Sc. Thesis Sharif University of Technology Soleymani Movahed, Farzaneh (Author) ; Saeedi, Mohammad Saeed (Supervisor) ; Ziyaei Halimehjani, Azim (Co-Advisor)
    Abstract
    Dithiocarbamate is one of the most useful components in the science of chemistry. They are used not only in agriculture as fungicides but also in photochemistry in order to determine and analyse NO in biological processes as well as in polymerization routes. Dithiocarbamates which are known as bidentate ligands with high yield are applied in many fields such as producing chemical drugs, functioning as intermediates in organic synthesis, protecting groups in peptide synthesis as well as highly chelating ligands. Regarding the high practically of dithiocarbamates and by focusing on their synthesis process, we have applied them as bidentate ligands. Cinnamaldehyde was condensed in ethanol with... 

    Fractal Analysis of Cosmic Microwave Background Radiation

    , Article Houches-Ecole d'Ete de Physique Theorique ; Volume 86, Issue C , 2007 , Pages 552- ; 09248099 (ISSN) Movahed, S ; Sharif University of Technology
    2007

    An Intrusion Detection System for the Grid Environment

    , M.Sc. Thesis Sharif University of Technology Movahed, Amirvala (Author) ; Jalili, Rasool (Supervisor)
    Abstract
    Existing Intrusion Detection Systems (IDSs) are not designed to deal with all categories of processing environments. This thesis focuses on IDSs for the Grid computing environment, and concentrates on feature selection and performance. An existing framework, Globus, is used as the basis for the consideration and development of the research issue in Grid computing. The system is based on two engine designs: (a) Signature and (b) Support Vector Machine; SVM has been selected for pattern discovery in traffic analysis. We found that the performance of the system greatly depends on the efficiency of the underlying framework and the number of Intrusion Detection System instances. We demonstrate... 

    Techno-economic optimization of biogas-fueled micro gas turbine cogeneration systems in sewage treatment plant

    , Article Energy Conversion and Management ; Volume 218 , 15 August , 2020 Movahed, P ; Avami, A ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    The aim of this paper is to investigate the feasibility of a combined cooling, heating, and power generation system with a micro turbine using biogas as the fuel to supply the heat and electricity demands in a real wastewater treatment plant. The plant is optimized using the system's total cost rate and the amount of the produced biogas as objective functions. The anaerobic digester is modeled using the ADM1 model. The optimization variables include digester hydraulic retention time, compressor pressure ratio, isentropic compressor efficiency, recuperator pinch time temperature, turbine isentropic efficiency, turbine input temperature, and the number of micro turbines. In the first scenario... 

    Observational constraints on a variable dark energy model

    , Article Physical Review D - Particles, Fields, Gravitation and Cosmology ; Volume 73, Issue 8 , 2006 ; 15507998 (ISSN) Movahed, M. S ; Rahvar, S ; Sharif University of Technology
    2006
    Abstract
    We study the effect of a phenomenological parameterized quintessence model on low, intermediate and high redshift observations. At low and intermediate redshifts, we use the Gold sample of supernova Type Ia (SNIa) data and recently observed size of baryonic acoustic peak from Sloan Digital Sky Survey (SDSS), to put constraint on the parameters of the quintessence model. At the high redshift, the same fitting procedure is done using WAMP data, comparing the location of acoustic peak with that obtain from the dark energy model. As a complementary analysis in a flat universe, we combine the results from the SNIa, CMB and SDSS. The best fit values for the model parameters are Ωm=0.27-0.02+0.02... 

    A novel secure bilinear pairing based remote user authentication scheme with smart card

    , Article Proceedings - IEEE/IFIP International Conference on Embedded and Ubiquitous Computing, EUC 2010, 11 December 2010 through 13 December 2010 ; 2010 , Pages 578-582 ; 9780769543222 (ISBN) Bayat, M ; Sabzinejad, M ; Movahed, A ; Sharif University of Technology
    2010
    Abstract
    Authentication schemes play vital roles in computer and communication security. In order to authenticate the remote users, password based schemes have been widely used. In this paper we introduce a secure remote user authentication scheme based on bilinear pairing that satisfies all security requirements which are mentioned for password based authentication schemes using smart card  

    Observational constraints with recent data on the DGP modified gravity

    , Article International Journal of Theoretical Physics ; Volume 48, Issue 4 , 2009 , Pages 1203-1230 ; 00207748 (ISSN) Movahed, M. S ; Farhang, M ; Rahvar, S ; Sharif University of Technology
    2009
    Abstract
    We study one of the simplest covariant modified-gravity models based on the Dvali-Gabadadze-Porrati (DGP) brane cosmology, a self-accelerating universe. In this model gravitational leakage into extra dimensions is responsible of late-time acceleration. We mainly focus on the effects of the model parameters on the geometry and the age of universe. Also we investigate the evolution of matter density perturbations in the modified gravity model, and obtain an analytical expression for the growth index, f. We show that increasing Ωrcleads to less growth of the density contrast δ, and also decreases the growth index. We give a fitting formula for the growth index at the present time and indicate... 

    Consistency of f(R)=R2-R02 gravity with cosmological observations in the palatini formalism

    , Article Physical Review D - Particles, Fields, Gravitation and Cosmology ; Volume 76, Issue 4 , 2007 ; 15507998 (ISSN) Movahed, M. S ; Baghram, S ; Rahvar, S ; Sharif University of Technology
    2007
    Abstract
    In this work we study the dynamics of the Universe in f(R)=R2-R02 modified gravity with the Palatini formalism. We use data from recent observations, such as the supernova type Ia Gold sample and Supernova Legacy Survey data, the size of the baryonic acoustic peak from the Sloan Digital Sky Survey, the position of the acoustic peak from the cosmic microwave background observations, and large-scale structure formation from the 2dFGRS survey, to put constraints on the parameters of the model. To check the consistency of this action, we compare the age of old cosmological objects with the age of the Universe. In the combined analysis with all the observations, we find the parameters of the... 

    Synthesis, Characterization and Voltametric Study of Single Molecule Magnet Hybrid Salts [Mn3O(O2CMe)6(Pyr)3][Keggin-Polyoxometalates]Type

    , M.Sc. Thesis Sharif University of Technology Kazemi Movahed, Leily (Author) ; Mohammadi Boghaei, Davar (Supervisor)
    Abstract
    Molecular nanomagnets, also known as Single Molecule Magnets (SMMs) are a class of molecules that at low temperature exhibit magnetic hysteresis of pure molecular origin and not related to a cooperative effect. In the past fifteen years they have attracted great interest for their potentiality to act as magnetic memory units and for the many quantum effects in the dynamics of their magnetization. Organization of SMM on surfaces is the first step in order to address the magnetic state of a single molecule or to connect the molecule to a conducting substrate. The complex nature of SMMs and the peculiar origin of their magnetic bistability have been representing for half a decade an obstacle to... 

    Switched Parasitic Antennas for the use in Wireless Communications

    , M.Sc. Thesis Sharif University of Technology Ahmady, Hesam (Author) ; Farzaneh, Forouhar (Supervisor)
    Abstract
    Switched Parasitic Antennas, as a kind of Smart Antennas, have several applications in Telecommunications and Radar systems. In the realm of wireless applications, these antennas provide the system with higher capacity owning to the fact that they are able to direct the main beam toward the desirable user. Moreover, they can be used to degrade the adverse effects of Multi-path. Multi-path reduction not only benefits mobile communication but applies to many applications of radar systems. These antennas, in addition, can be utilized in Direction Finding. In the case of other types of Smart Antennas, the above mentioned benefits can be achieved with high costs due to the fact that there are a... 

    Analysis and Simulation of Mars Rover Curiosity in the X and UHF Bands

    , M.Sc. Thesis Sharif University of Technology Torabi, Masoud (Author) ; Forouhar, Farzaneh (Supervisor)
    Abstract
    Mars rover Curiosity is a mobile scientific laboratory which it’s mission is to assess the biological potential of the landing site and characterize the geology of the landing region. This rover communicate to a Mars orbiter named MRO satellite in the UHF band which relies the signals to the Earth stations. Also this rover communicate to the Earth stations directly in the X band. In this thesis, we determine the technical characteristics of stations and simulate Earth-Mars radio links. So we calculate :
    1. determine the technical characteristics of Earth stations
    2. determine the technical characteristics of satellite and Curiosity
    3. Earth-Mars orbital position in the... 

    , M.Sc. Thesis Sharif University of Technology Razieh, Azad (Author) ; Farzaneh, Forouhar (Supervisor)
    Abstract
    In recent years due to the advances in semiconductor technology and the ability to implement small-scale manufacturing, communication at 60 GHz band receive more attention than ever has been. The use of this frequency band is not only about 7-9 GHz unlicensed broadband access provided, but getting smaller devices make it possible to use multiple antennas at the transmitter and receiver, and thus taking advantage of multiple input – multiple output systems. Antennas used in these systems should have features such as small size , low weight, high gain and bandwidth and also they should keep their high efficiency and gainat high frequency range (about a few GHz ). To achieve these features... 

    Design and Simulation of Smart Patch Antenna Array in 2.4 GHz band

    , M.Sc. Thesis Sharif University of Technology Hosseini, Mahdi (Author) ; Farzaneh, Forouhar (Supervisor)
    Abstract
    Over the past few years , demand for wireless communication services have grown at a formidable rate. As such we need to find new ways to support more and more wireless users in a confined space. this means that the capacity of networks should be significantly increased to overcome formidable rate of subscribers growth. That is why the smart antennas have become very popular in communication systems. Smart antennas are a kind of adaptive antenna arrays with smart signal processing algorithms used to find direction of arrival(DOA) of the signal, and use it to calculate suitable weights to direct the antenna beam on the desired user and nulling interferences. In this thesis, DOA estimation... 

    Evaluation and Improvement of DOA Estimation Methods in Dipole Antenna Arrays with Different Geometries

    , M.Sc. Thesis Sharif University of Technology Sasannia, Zahra (Author) ; Farzaneh, Forouhar (Supervisor)
    Abstract
    In this thesis, some of the well-known DOA algorithms namely Bartlett, Capon, Linear prediction, Maximum Entropy, Pisarenko harmonic decomposition, Minimum norm and MUSIC are analyzed and compared with each other in the identical situations using a uniform linear array. Then based on these comparisons, the appropriate algorithm is selected. In the next step since the linear arrays can't estimate both angles of arrival (Azimuth and Elevation) simultaneously, two dimensional (2D) geometries are introduced and are also compared to each other. Then one of them (circular array) is selected for dipole antenna arrays. The performance of the selected array is evaluated using isotropic elements for... 

    Design and Simulation of mmWave Antenna Arrays with Novel 3D Geometries for 5G Wireless Applications

    , M.Sc. Thesis Sharif University of Technology Ahmadi, Nima (Author) ; Farzaneh, Forouhar (Supervisor)
    Abstract
    In the new generations of mobile communication systems, smart antennas are used to achieve higher capacities. Since these systems have the ability to form a radiation pattern where the desired signal is received with minimum distortion and inteferers are received with a significant attenuation therefore their application makes it possible to have a large signal to inteference ratio. In addition by setting the main beam direction towards the desired signal, it is conceivable to realize the the communication with a lower power. The optimal methods for angle-of-arrival estimation and beamforming in one and two dimensional structures has been studied in the literature, but the three dimensional... 

    Analysis and Design of a Multiple-Input Multiple-output (MIMO) Transmitter in the 60 GHz Band with a Beam Steering Capability Using All-digital Phase-locked Loop Chip

    , Ph.D. Dissertation Sharif University of Technology Salarpour, Mahdi (Author) ; Farzaneh, Forouhar (Supervisor)
    Abstract
    Multiple-Input Multiple-Output (MIMO) communications at millimeter-wave (mm-wave) frequencies (e.g., in the 60 GHz band) is a modern technology recently considered for various applications, such as emerging 5G services for multi-user MIMO (MU-MIMO) and high-resolution frequency-modulated continuous wave (FMCW) MIMO radars to support multi-gigabit throughputs in short-range environments via spatial multiplexing-diversity. Nevertheless, the impairments of communication channels in this frequency band, including significant propagation loss and severe blockage effect, are quite challenging to allow an efficient communication link. Hence, beamforming/beam steering can play a crucial role in 60... 

    Wideband Microwave Radio Direction Finding Based on Phase Interferometry Method for Two and Three Dimensional Arrays with Minimum Number of Antennas

    , Ph.D. Dissertation Sharif University of Technology Mollai, Sajjad (Author) ; Farzaneh, Forouhar (Supervisor)
    Abstract
    The interferometer method, as one of the most accurate schemes for wideband direction finding (DF), is used. The interferometer method has various algorithms which can be implemented depending on the required specifications. The advantages and disadvantages of these algorithms have been evaluated and the appropriate algorithm for a general practical case in view of the ambiguity resolution is proposed. The receivers’ channel phase tracking error is of significant concern in practice, in interferometric DF systems. The induced error due to channels phase tracking error is estimated. Furthermore the use of physically realizable antennas, achievement of high accuracy, minimum number of antennas... 

    Array Geometry Based Beamforming in Smart Antennas Intended for Capacity Improvment in Wireless Systems

    , Ph.D. Dissertation Sharif University of Technology Poormohammad, Sarah (Author) ; Farzaneh, Forouhar (Supervisor)
    Abstract
    Novel two dimensional and three dimensional antenna array geometries for smart antenna application are introduced. MMSE beamforming algorithm, using these arrays, in presence of signal, noise and interferences is implemented. Beamforming approach is used for every type of array assuming uniform and log-normal distributions for the interference amplitudes. Equal volume cylindrical or prism type arrays with circular, hexagonal, triangular, square and star cross sections with equal number of elements are considered for comparison. Novel geometries consisting of rotated cross sections are studied as well. In each case the relative SIR’s are compared in these geometries, showing that the... 

    Reliable and Uninterrupted Telecommunication link between Earth and Mars

    , M.Sc. Thesis Sharif University of Technology Ahmadi, Jamil (Author) ; Farzaneh, Frohar (Supervisor)
    Abstract
    For a manned space mission to Mars, one of the essential requirements is to have a two-way, uninterrupted communication link.Three Mars Synchronous Satellites (MSS), are proposed to ensure the telecommunication link in all locations on Mars (except its poles) at any time. At any given moment, at least two of the three satellites (MSS) is connected to the Deep Space Communication Complex (DSCC) (NASA Earth Station). But the use of MSS satellites is not adequate during the periods of solar conjunction and solar opposition. Due to the fact that the sun blocks or weakens the receiver signal, a solar orbiting satellite (SOS) is proposed to maintain the communication link at this condition....