Simulation and multi-objective optimization of a combined heat and power (CHP) system integrated with low-energy buildings

, Article Journal of Building Engineering ; Volume 5 , 2016 , Pages 13-23 ; 23527102 (ISSN) Pirkandi, J ; Jokar, M. A ; Sameti, M ; Kasaeian, A ; Kasaeian, F ; Sharif University of Technology

Elsevier Ltd 2016

Abstract

One of the novel applications of gas turbine technology is the integration of combined heat and power (CHP) system with micro-gas turbine which is spreading widely in the field of distributed generation and low-energy buildings. It has a promising great potential to meet the electrical and heating demands of residential buildings. In this study, a MATLAB code was developed to simulate and optimize the thermoeconomic performance of a gas turbine based CHP cycle. Three design parameters of this cycle considered in this research are compressor pressure ratio, turbine inlet temperature, and air mass flow rate. Firstly, two objective functions including exergetic efficiency and net power output...

Numerical and experimental study of a jet impinging with axial symmetry with a set of heat exchanger tubes

, Article Mechanics and Industry ; Volume 19, Issue 1 , 2018 ; 22577777 (ISSN) Jamalei, E ; Alayi, R ; Kasaeian, A ; Kasaeian, F ; Ahmadi, M. H ; Sharif University of Technology

EDP Sciences 2018

Abstract

The main purpose of this research is to predict the flow field of impinging turbulent jet with cylinder in a 3-d state. Nowadays, shear stress has multiple uses in the industry. The study has been conducted in both compressible and incompressible states with output velocities between 100 and 150 m/s, in different eccentricities of jet with respect to the first cylinder, and in various nozzle outlet orifice distances from front edge of the first cylinder. Pressure distribution and shear stress on cylinder surfaces have been determined and efficiency of jet in cleaning the heat exchangers pipes has been analyzed. Also, an experimental investigation has been conducted in order to verify the...

Experimental study on viscosity of spinel-type manganese ferrite nanofluid in attendance of magnetic field

, Article Journal of Magnetism and Magnetic Materials ; Volume 428 , 2017 , Pages 457-463 ; 03048853 (ISSN) Amani, M ; Amani, P ; Kasaeian, A ; Mahian, O ; Kasaeian, F ; Wongwises, S ; Sharif University of Technology

2017

Abstract

In this paper, an experimental evaluation on the viscosity of water-based manganese ferrite nanofluid with and without magnetic field with 100, 200, 300, and 400 G intensities has been conducted. The Brookfield DV-I PRIME viscometer is implemented to measure the MnFe2O4/water nanofluid viscosity and to evaluate the influence of different volume concentrations (from 0.25% to 3%) and various temperatures (from 20 to 60 °C) on the viscosity. According to the measurements, viscosity incrementally increases with the augmentation of nanoparticles concentration while it remarkably decreases at higher temperatures under absence and attendance of magnetic field. The maximum viscosity ratio of 1.14 is...

An Outlier Detection and Cleaning Algorithm in Classification Applications

, M.Sc. Thesis Sharif University of Technology Kasaeian, Mojtaba (Author) ; Beigy, Hamid (Supervisor)

Abstract

Increasing information in real world needs the special instrument for data saving, cleaning and processing. Data cleaning is so important steps in machine learning application that include various kind of procedures such as, duplicate detection, fill out missing value and outlier detection. Outliers are observation, which deviates so much from other observations as to arouse suspicions that it was generated by a different mechanism. Many researches has been carried out in the machine learning field with regards to the outlier detection that has applications in real world, like: Intrusion detection for network security, fraud detection in credit cards, fault detection for security in critical...

Closed-loop powered-coast-powered predictive guidance for spacecraft rendezvous with non-singular terminal sliding mode steering

, Article Acta Astronautica ; Volume 166 , 2020 , Pages 507-523 Kasaeian, S. A ; Ebrahimi, M ; Assadian, N ; Sharif University of Technology

Elsevier Ltd 2020

Abstract

The present study aims to present a guidance algorithm based on the relative motion prediction for orbital rendezvous, in which a coast phase is allowed between two powered phases. In both powered phases, the solution of the Hill-Clohessy-Wiltshire equations is used to find the required state variables at each time instant. To track the required trajectory and compensate for any orbital perturbations and uncertainties, a non-singular terminal sliding mode method is utilized as the steering law. Then, the finite time convergence of the state variables is mathematically proved. In addition, the starting time of the second powered phase is adapted to perturbations and uncertainties by another...

Improving transparency in dye-sensitized nanostructured solar cells by optimizing nano-porous titanium dioxide photo-electrode

, Article Journal of Materials Science: Materials in Electronics ; Volume 28, Issue 11 , 2017 , Pages 7811-7818 ; 09574522 (ISSN) Nikfarjam, A ; Mohammadpour, R ; Kasaeian, A ; Zebhi, Z ; Sharif University of Technology

Springer New York LLC 2017

Abstract

Today’s the technology based on dye-sensitized solar cells (DSSCs) has an important role in all photovoltaic system technologies. DSSCs can generate electricity with various degrees of transparency; this makes it suitable for use in various industries, especially in construction industry as smart windows. In fact DSSC can produce electricity and having natural light, simultaneously. It is obvious that DSSCs need to absorb solar radiation as much as possible. Since, the effective use of all incident lights leads to an increase in cell efficiency and this increase in efficiency is related to the amount of dye adsorbed on the surface of nanostructured electrode, so higher amount of dye for...

ANN and ANFIS models to predict the performance of solar chimney power plants

, Article Renewable Energy ; Volume 83 , November , 2015 , Pages 597-607 ; 09601481 (ISSN) Amirkhani, S ; Nasirivatan, S ; Kasaeian, A. B ; Hajinezhad, A ; Sharif University of Technology

Elsevier Ltd 2015

Abstract

A precise model of the behavior of complex systems such as solar chimney power plants (SCPP) would be much beneficial. Also, such a model would be quite contributing to the control of solar chimney operation. In this paper, the identification and modeling of SCPP utilizing ANN and Adaptive Neuro Fuzzy Inference System (ANFIS) are discussed. The modeling is based on the data of three working days which were taken of a built pilot in University of Zanjan, Iran. The input parameters are time, radiation and ambient temperature, while the output is the air velocity at the inlet of the chimney. The results of ANN model and ANFIS model were compared; it was found that ANFIS model exhibited better...

Super twisting sliding mode synchronization with on-off thrusters for rendezvous in an elliptic orbit

, Article 67th International Astronautical Congress, IAC 2016, 26 September 2016 through 30 September 2016 ; 2016 ; 00741795 (ISSN) Kasaeian, S. A ; Ebrahimi, M ; Assadian, N ; Yazdani, S ; Sharif University of Technology

International Astronautical Federation, IAF 2016

Abstract

The rendezvous is one of the most important parts of some current and future space missions. To reduce the risk of collision, the terminal phase of orbital rendezvous is very critical and requires high accuracy for controlling the chaser relative position and velocity. The terminal phase starts with detection of the target spacecraft by the chaser sensors. Due to the safety requirements and availability of the relative position and velocity data, generally the closed loop guidance and control are utilized. In this study, the closed loop guidance and control of the orbital rendezvous of a chaser satellite is studied. The target is assumed to be in an elliptical orbit and the relative dynamics...

High cycle fatigue behavior and thermal properties of PLA/PCL blends produced by fused deposition modeling

, Article Journal of Polymer Research ; Volume 30, Issue 7 , 2023 ; 10229760 (ISSN) Kiani, P ; Sedighi, M ; Kasaeian Naeini, M ; Jabbari, A. H ; Sharif University of Technology

Springer Science and Business Media B.V 2023

Abstract

In this paper, high cycle fatigue behavior and thermal properties of blend specimens made of polylactic acid (PLA) and polycaprolactone (PCL) were studied and the influence of crystallization was investigated on the fatigue behavior. In this regard, fused deposition modeling method was employed to manufacture neat-PLA, neat-PCL, PLA/10wt.% PCL (90/10), and PLA/20wt.% PCL (80/20) specimens. The results show that the addition of 10wt.% and 20wt.% of PCL to the neat-PLA increases the elongation of the specimens by 32% and 284%, respectively, compared to that of the neat-PLA. However, Young’s modulus respectively decreases by 22% and 34%. According to the differential scanning calorimetry (DSC)...

Effect of dip-coating on tensile and high cycle fatigue behavior of 3D printed bio-polymer blends

, Article 2023 30th National and 8th International Iranian Conference on Biomedical Engineering, ICBME 2023 ; 2023 , Pages 232-236 ; 979-835035973-2 (ISBN) Kiani, P ; Sedighi, M ; Kasaeian Naeini, M ; Mostahsan, A. J ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2023

Abstract

Considering the desirable biodegradable properties and mechanical characteristics of poly lactic acid (PLA) and poly caprolactone (PCL), these polymers are recently widely utilized in medical applications including the fabrication of body-compatible implants. One of the most efficient manufacturing methods to fabricate polymer-based implants is 3D printing, due to its ability to rapidly produce parts with complex geometries. In this study, an effort has been made to study the impact of the dip-coating process on tensile and high cycle fatigue behavior of 3D printed PLA/PCL blends, using PCL/chloroform solution. The results demonstrate that after applying the PCL coating on the surface of the...

Preparation, Surface Modification and Application of Nanocomposite Membranes Based on Transition Metals- Dichalcogenide Nanoparticles in Forward Osmosis Desalination Process

, Ph.D. Dissertation Sharif University of Technology Nikkhoo, Mohammad (Author) ; Bagherzadeh, Mojtaba (Supervisor) ; Ahadian, Mohammad Mahdi (Supervisor) ; Amini, Mojtaba (Supervisor)

Abstract

Different parts of this research are focused on developing FO membranes and improving their performance. For this purpose, thin film composite (TFC) membranes with fixed composition of polyethersulfone/polyamide (PES/PA) have been used to investigate the effect of nanocomposites containing transition metal dichalcogenides (TMDs) on their performance. The support layer in all cases is PES, which is prepared through the phase inversion process and does not contain any nanofillers. The modification process takes place in the polyamide layer by dispersing the desired nanoparticles in the aqueous monomer solution necessary to form this active layer. Identification and characterization of...

Synthesis, Structure and Catalytic Application of Mn, Fe and Mo Complexes with Schiff base and Oxazoline ligands and Theoretical Mechanistic Studies on the Role of Heme and non-Heme Iron(IV)-Oxo Species in Hydroxylation and Epoxidation Reactions

, Ph.D. Dissertation Sharif University of Technology Tahsini , Laleh (Author) ; Bagherzadeh, Mojtaba (Supervisor)

Abstract

The first part of this thesis describes the synthesis and characterization of several Mn, Fe and Mo complexes containing tridentate Schiff base and oxazoline ligands and their reactivities as catalysts in the oxidation of organic compounds like olefins and sulfides, as well. The crystal structures of newly prepared cis-dioxo-bis[2-(2′-hydroxyphenyl)-oxazolinato]molybdenum(VI), cis-[MoO2(phox)2] and (N-hydroxyphenyl-salicylidenamine)(acetylacetonato)ethanol iron(III), [FeIII(N-OPh-sal)(acac)EtOH] complexes have been described by X-ray crystallography. Due to the difficulties in the preparation of suitable single crystals of novel...

Design and Fabrication of RFID Front END Transceiver single chip with 2.5W Output Power

, Ph.D. Dissertation Sharif University of Technology Javidan, Javad (Author) ; Atarodi, Mojtaba (Supervisor)

Abstract

This thesis deals with the front-End of an Integrated RFID Reader operated in 860MHz to 960MHz, which integrates a RF transceiver including PA, LNA and Mixer. In the receiver part, a power amplifier was fabricated and measured and in the transmitter part, LNA and Mixer were designed. There is a growing interest in utilizing CMOS technologies for RF power amplifiers (PAs). Although several advances have been made recently to enable full integration of PAs in CMOS, it is still among the most difficult challenges in achieving a truly single-chip radio system in CMOS. This is exacerbated by supply voltage reduction due to CMOS technology scaling and on-chip passive losses due to the conductive...

, M.Sc. Thesis Sharif University of Technology Hatami, Mojgan (Author) ; Bagherzadeh, Mojtaba (Supervisor)

Abstract

Inert gold become catalytically active when dispersed in the form of nanoparticles. Isolated gold nanoparticles have demonstrated high catalytic activity for both oxidation and reduction reactions. In order to obtain high catalytic activity, gold nanoparticles are generally dispersed on support materials, among which oxides are commonly used. However, a substantial decrease in activity and selectivity of the immobilized catalysts is frequently observed due to the heterogeneous nature of these support materials in reaction media. In the course of our study on the metal-based catalysis for synthesis of organic compounds, we herein report that rod-shaped Au nanoparticles in aqua solution...

Synthesis and Characterization of a novel Ruthenium(II) Complex With Bidentate O,N-donor OxazolineLigand and Study of Catalytic Oxidation of Sulfides and Alkanes

, M.Sc. Thesis Sharif University of Technology Hosseini, Mojtaba (Author) ; Bagherzadeh, Mojtaba (Supervisor)

Abstract

The 2-(2′-hydroxyphenyl)-oxazoline ligand (Hphox) is generated from 1:1 condensation of methyl salicylate with 2-aminoethanol. Novel [Ru(Hphox)2(H2O)2] (Hphox = 2-(2′-hydroxyphenyl)-oxazoline ) complex has been synthesized and characterized by physic-chemical methods. Oxidation of sulfides catalyzed by the mixed-ligand ruthenium(II) complex [Ru(Hphox)2(H2O)2]using urea-hydrogen peroxide (UHP) as oxidant was investigated under mild condition within 1 h. The results showed that mixed-ligand ruthenium(II) complex was effective catalyst in oxidation of sulfides in whichsulfoxideswere the only products. Using this catalytic system in the oxidation of alkanes, ketones were obtained as the main...

Synthesis of Core-Shell Nanoparticles Supported Iron and Vanadium Schiff Base and Their Application as a Catalyst for Oxidation of Sulfides, Alcohols and Olefins

, M.Sc. Thesis Sharif University of Technology Payab, Ebrahim (Author) ; Bagherzadeh, Mojtaba (Supervisor)

Abstract

In this work, synthesized Fe3O4 magnetic nanoparticles andcoated with SiO2 to prepare magnetic core-shell nanoparticles. Then immobilized Schiff baseof iron and vanadium complexes on magnetic core-shell nanoparticles was prepared as a recoverable magnetic nano catalysts. These catalysts were named Fe3O4@SiO2@L1@Fe, Fe3O4@SiO2@L2@Fe and Fe3O4@SiO2@L3@V. Furthermore,olefines epoxidation, sulfides and alcohols oxidation were studied with using iron and vanadium magnetic nano catalysts. The supported catalysts were characterized by atomic absorption, FT-IR and UV–Vis spectra.The catalytic performance of the synthesized iron catalyst was tested for the epoxidation of cyclohexene, styrene and...

Preparation of Heterogeneous Catalysts by Immobilization of Molybdenum and Manganese-shiff Base Complexes into the Nanopores of Zeolite and SBA-15

, Ph.D. Dissertation Sharif University of Technology Zare, Maryam (Author) ; Bagherzadeh, Mojtaba (Supervisor)

Abstract

This thesisconsiders new fundamental approaches to yield heterogeneous catalysts in to three sections. The first section described the immobilization of the molybdenum-Schiff base complexes in pores of SBA-15 in two different methodologies depending on the actual structure of the complexes., (i) stepwise formation of the complex by initial covalent anchoring of one of the components and consecutive solid phase synthesis consisting of the condensation of the other components of the salen complex (iii) one-step complex immobilization by covalent binding through the ligand.Based on the first methodology, we report the preparation of ordered mesoporous silica SBA-15 containing a molybdenum...

Synthesis and Characterization of Various Transition Metal Complexes and the Application in Oxidation, Heck, Suzuki, Sonogashira and Olefin Metathesis

, Ph.D. Dissertation Sharif University of Technology Amini, Mojtaba (Author) ; Bagherzadeh, Mojtaba (Supervisor)

Abstract

In nature, catalysis is of vital importance in a wide variety of biochemical processes catalyzed by metalloenzymes. The functions performed by the metalloenzymes and their significance have inspired a range of biomimetic studies, and intense efforts have been concentrated on the synthesis of low molecular weight complexes to model the spectroscopic features of such enzymes. Concomitantly, a challenging frontier in the field of biomimetic chemistry is the development of highly reactive model compounds that are able to effect rapid and selective substrate conversion. Some important catalytic transformations that have gained attention in recent years involve the carbon-carbon coupling, olefin...

Synthesis and Study of Catalytic Reactivity Oxo Vanadium (IV)& (V) Complexes with N,N'-Ethylenebis(Salicylimine)Ligand in Oxidation of Sulfides and Epioxidation of Olfins by Urea Hydrogen Peroxide (UHP) and Tert-Butyl Hydroperoxide (TBHP)

, M.Sc. Thesis Sharif University of Technology Nadiri, Siheila (Author) ; Bagherzadeh, Mojtaba (Supervisor)

Abstract

The selective oxidation of sulfides to sulfoxides is an important method in organic synthesis because sulfoxides are useful synthetic intermediates for the construction of various chemically and biologically significant molecules. To date, the most important method of preparation involves the oxidation of sulfides. Various oxidizing agents are used for this purpose. Oxovanadium(IV)(Salen) and oxovanadium(V)(Salen)Cl were synthesised and screened in the vanadium-catalysed oxidation of sulfides to solfuxides with urea hydrogen peroxide(UHP) as terminal oxidant. Both complexes showed good activity and selectivity trough the catalytic reaction.characterized by elemental analyses, IR, 1H and 13C...

Design and Implementation of Fully Integrated Frequency Synthesizer for Biomedical Applications

, M.Sc. Thesis Sharif University of Technology Aghlmand, Fatemeh (Author) ; Atarodi, Mojtaba (Supervisor)

Abstract

Fully integrated frequency synthesizer is one of the important system-on-chips building blocks. Among this circuit’s remarkable applications, Bioelectronics field is very common. In these applications, advanced microelectronic circuits are used in order to diagnosis and treatment of diseases. The aim of this thesis is design and implementation a wideband frequency synthesizer in a 0.18um CMOS technology. The main usage of this circuit is in a fully integrated implantable biomedical sensory chip. This circuit generates two necessary local signals in sensory chip to stimulus cells and process the information.
Frequency synthesizer is based on phased locked loop (PLL) circuit and produce...