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An efficient solution to measure inductance on-the-fly
, Article Measurement: Journal of the International Measurement Confederation ; Volume 223 , 2023 ; 02632241 (ISSN) ; Atarodi, M ; Sharif University of Technology
Elsevier B.V
2023
Abstract
Magnetic components such as inductors have supreme importance in switch-mode power supplies (SMPS). The design of the SMPS circuit is typically based on the information obtained from simulations and available datasheets. However, the behavior of the implemented circuit can deviate from expectation due to its time-varying characteristics, operation point, and various environmental factors. Therefore, advanced methods are required to measure the behavior of inductors in-circuit. To address this challenge, an in-circuit measurement solution based on the energy transfer characteristic of the inductance is presented. It is a cost-effective and easy-to-implement solution that can be integrated...
Design & implementation of a high precision & high dynamic range power consumption measurement system for smart energy IoT applications
, Article Measurement: Journal of the International Measurement Confederation ; Volume 146 , 2019 , Pages 458-466 ; 02632241 (ISSN) ; Atarodi, S. M ; Sharif University of Technology
Elsevier B.V
2019
Abstract
Internet of Things (IoT) devices have strict necessity for power consumption in order to achieve expected battery life. IoT nodes feature extreme power consumption range over 100 dB, between their operating modes. The main focus of this paper is to design and implement a high precision, high dynamic range, low power, and flexible power measurement system, which can be applied to different applications. The proposed system consists of a voltage regulating control loop, zero offset amplifiers, high precision analog to digital converters, and reference voltage. The proper operation of the proposed circuit are verified numerically with simulations and experimental measurements. The implemented...
Optimizing High Dynamic Range Current Measurement Circuit for IoT Applications
, Article 2023 5th Iranian International Conference on Microelectronics, IICM 2023 ; 2023 , Pages 211-215 ; 979-835036019-6 (ISBN) ; Atarodi, S. M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2023
Abstract
The power consumption of Internet-of-Things (IoT) devices is a major concern as it directly affects battery life. Therefore, measuring and monitoring the energy usage of IoT devices is vital. However, measuring the current consumption measurement of IoT devices is challenging as it must cover a wide range with low power consumption. In this paper, an improved design for the current measurement circuit is presented. The pass element which is placed in the current path to measure the current based on the charge and discharge of the capacitor is optimized to have reduced voltage drop, lower power consumption, decreased costs, and improved integration with IoT devices. The proposed circuit is...
Dendritic magnetite decorated by pH-responsive PEGylated starch: A smart multifunctional nanocarrier for the triggered release of anti-cancer drugs
, Article RSC Advances ; Volume 5, Issue 60 , Jun , 2015 , Pages 48586-48595 ; 20462069 (ISSN) ; Mazaheri Tehrani, Z ; Hosseini, S. H ; Sharif University of Technology
Royal Society of Chemistry
2015
Abstract
In the present study, we designed a pH-responsive drug nanocarrier based on polyamidoamine-modified Fe3 O4 nanoparticles coated by PEGylated starch-co-poly(acrylic acid). This carrier was used for the controlled release of doxorubicin as an anticancer drug model. The purpose of using the polyethylene glycol moiety is to generate a biostable nanocarrier in blood stream as it has been reported widely in the pharmaceutical literature. The use of a poly(acrylic acid) segment also provided pH-sensitivity to the polymer. Besides, the magnetic nanoparticles facilitate the cancer cell targeting with an external magnetic field located near the tumor site. This carrier was...
A Novel Energy Efficient Method for LoRa Network with Practical Implementation
, Ph.D. Dissertation Sharif University of Technology ; Atarodi, Mojtaba (Supervisor) ; Amini, Arash (Co-Supervisor)
Abstract
The Internet of things (IoT) is an emerging technology, encompassing wide aspects of applications. It provides intelligent connections between objects, devices, and living creatures. The IoT devices are mostly powered by limited energy sources like batteries. Therefore, optimizing their power consumption is necessary. First, this idea will be examined from different perspectives and then its applications and challenges in various fields and areas will be presented. The IoT applications require low-cost, low-energy, reliable, robust, secure, and scalable networks. The Low-power Wide-Area Network (LPWAN) is considered as one of the most potential solutions for IoT in the near future due to its...
Online jointly estimation of hysteretic structures using the combination of central difference Kalman filter and Robbins–Monro technique
, Article JVC/Journal of Vibration and Control ; 2020 ; Bakhshi, A ; Yang, T. T. Y ; Sharif University of Technology
SAGE Publications Inc
2020
Abstract
Rapid assessment of structural safety and performance right after the occurrence of significant earthquake shaking is crucial for building owners and decision-makers to make informed risk management decisions. Hence, it is vital to develop online and pseudo-online health monitoring methods to quantify the health of the building right after significant earthquake shaking. Many Bayesian inference–based methods have been developed in the past which allow the users to estimate the unknown states and parameters. However, one of the most challenging part of the Bayesian inference–based methods is the determination of the parameter noise covariance matrix. It is especially difficult when the number...
Online probabilistic model class selection and joint estimation of structures for post-disaster monitoring
, Article JVC/Journal of Vibration and Control ; 2020 ; Bakhshi, A ; Yang, T. T. Y ; Sharif University of Technology
SAGE Publications Inc
2020
Abstract
Online selection of the appropriate model and identifying its parameters based on measured vibrational data are among the challenging issues in dynamic system identification. After a severe earthquake, quick monitoring and assessment of structural health status play a crucial role in effective critical risk management for the building owners and decision-makers. The Bayesian multiple modeling approach is a suitable tool for optimal model class selection, which is used in this article mainly for improving data fitting precision, decreasing dimensions of structural unknown vector through removing unnecessary parameters, detecting the occurrence and type of predominant phenomenon related to...
Online probabilistic model class selection and joint estimation of structures for post-disaster monitoring
, Article JVC/Journal of Vibration and Control ; Volume 27, Issue 15-16 , 2021 , Pages 1860-1878 ; 10775463 (ISSN) ; Bakhshi, A ; Yang, T. T .Y ; Sharif University of Technology
SAGE Publications Inc
2021
Abstract
Online selection of the appropriate model and identifying its parameters based on measured vibrational data are among the challenging issues in dynamic system identification. After a severe earthquake, quick monitoring and assessment of structural health status play a crucial role in effective critical risk management for the building owners and decision-makers. The Bayesian multiple modeling approach is a suitable tool for optimal model class selection, which is used in this article mainly for improving data fitting precision, decreasing dimensions of structural unknown vector through removing unnecessary parameters, detecting the occurrence and type of predominant phenomenon related to...
Online jointly estimation of hysteretic structures using the combination of central difference kalman filter and robbins–monro technique
, Article JVC/Journal of Vibration and Control ; Volume 27, Issue 1-2 , 2021 , Pages 234-247 ; 10775463 (ISSN) ; Bakhshi, A ; Yang, T. T. Y ; Sharif University of Technology
SAGE Publications Inc
2021
Abstract
Rapid assessment of structural safety and performance right after the occurrence of significant earthquake shaking is crucial for building owners and decision-makers to make informed risk management decisions. Hence, it is vital to develop online and pseudo-online health monitoring methods to quantify the health of the building right after significant earthquake shaking. Many Bayesian inference–based methods have been developed in the past which allow the users to estimate the unknown states and parameters. However, one of the most challenging part of the Bayesian inference–based methods is the determination of the parameter noise covariance matrix. It is especially difficult when the number...
Individual virtual phantom reconstruction for organ dosimetry based on standard available phantoms
, Article Iranian Journal of Radiation Research ; Volume 7, Issue 4 , 2010 , Pages 201-206 ; 23223243 (ISSN) ; Aghaeizadeh Zoroofi, R ; Tehrani Fard, A. A ; Akhlaghpoor, S ; Chen, Y. W ; Sato, Y ; Sharif University of Technology
Novim Medical Radiation Institute
2010
Abstract
Background: In nuclear medicine application often it is required to use computational methods for evaluation of organ absorbed dose. Monte Carlo simulation and phantoms have been used in many works before. The shape, size and volume in organs are varied, and this variation will produce error in dose calculation if no correction is applied. Materials and Methods: A computational framework for constructing individual phantom for dosimetry was performed on five liver CT scan data sets of Japanese normal individuals. The Zubal phantom was used as an original phantom to be adjusted by each individual data set. This registration was done by Spherical Harmonics (SH) and Thin-Plate Spline methods....
Structural health monitoring of nonlinear structures using real-time hysteresis loop analysis
, M.Sc. Thesis Sharif University of Technology ; Rahimzadeh Rofooei, Fayaz (Supervisor) ; Mahdavi, Hossein (Co-Supervisor)
Abstract
Under conventional seismic design strategies, civil engineering structures are designed to undergo inelastic deformation to dissipate earthquake energy, leading to residual displacements and nonlinear deformations in the structure. As a result, there is an essential need for structural health monitoring methods to detect and process these nonlinear behaviors. In this dissertation, a model-free Hysteresis Loop Analysis (HLA) method is developed to identify damage and monitor the structure's performance online, under the earthquake excitations in both severe linear and nonlinear scenarios. The structural models used to validate this method includes three types of one-story, five-story, and...
Optimal placement and sizing of distributed resources for congestion management considering cost/benefit analysis
, Article IEEE PES General Meeting, PES 2010, 25 July 2010 through 29 July 2010, Minneapolis, MN ; 2010 ; 9781424483570 (ISBN) ; Abbaspour Tehrani Fard, A ; Rashidinejad, M ; Lee, K. Y ; Sharif University of Technology
2010
Abstract
Congestion management is one of the most important issues for secure and reliable system operations in deregulated electricity market. This paper presents a cost/worth analysis approach for optimal location and sizing of Distributed Resources (DRs) to mitigate congestion and increase security of the system. In order to reduce the solution space a priority of candidate buses is formed, then optimal location and sizing problem is discussed. To increase the accuracy of results, load duration curve is constituted and based on this curve different load levels are incorporated into this study. Proposed method considers economical factors such as congestion rent, deferred upgrading investment and...
Formation of intermetallic reaction layer and joining strength in nano-composite solder joint
, Article Journal of Materials Science: Materials in Electronics ; Volume 24, Issue 3 , 2013 , Pages 838-847 ; 09574522 (ISSN) ; Kokabi, A. H ; Miyashita, Y ; Mutoh, Y ; Madaah Hosseini, H. R ; Sharif University of Technology
2013
Abstract
In this study, the effects of CeO2 nanoparticle addition on tensile strength and formation of interfacial intermetallic compound layer for lead-free Sn-3.5Ag-0.7Cu solder joint were investigated. The results showed that the thickness of intermetallic layer was decreased with increasing weight percentages of CeO2 reinforcements, and the growth of the intermetallic layer was remarkably suppressed during isothermal aging at 150 C. It was also found that the tensile strength of the solder joint gradually increased with the addition of CeO2 particles, reached to the maximum value at 0.5 wt% CeO2 and then decreased drastically with further increase in CeO2 content. Microstructural investigation of...
Statistical construction of a Japanese male liver phantom for internal radionuclide dosimetry
, Article Radiation Protection Dosimetry ; Volume 141, Issue 2 , 2010 , Pages 140-148 ; 01448420 (ISSN) ; Aghaeizadeh Zoroofi, R ; Abbaspour Tehrani Fard, A ; Akhlaghpoor, S ; Hori, M ; Chen, Y. W ; Sato, Y ; Sharif University of Technology
2010
Abstract
A computational framework is presented, based on statistical shape modelling, for construction of race-specific organ models for internal radionuclide dosimetry and other nuclear-medicine applications. This approach was applied to the construction of a Japanese liver phantom, using the liver of the digital Zubal phantom as the template and 35 liver computed tomography (CT) scans of male Japanese individuals as a training set. The first step was the automated object-space registration (to align all the liver surfaces in one orientation), using a coherent-point-drift maximum-likelihood alignment algorithm, of each CT scan-derived manually contoured liver surface and the template Zubal liver...
Manipulation of the electric field of electrospinning system to produce polyacrylonitrile nanofiber yarn
, Article Journal of the Textile Institute ; Volume 98, Issue 3 , 2007 , Pages 237-241 ; 00405000 (ISSN) ; Hosseini, Y ; Hosseini Ravandi , S. A ; Sharif University of Technology
2007
Abstract
Electrospinning is a process that produces nanofiber through the action of an external electric field imposed on a polymer solution or melt. This paper introduces a new system capable of producing continuous uniaxially aligned PAN nanofiber yarn by manipulating the electric field. The manipulation was carried out by employing a negative charged bar in the electric field of conventional electrospinning system, leading to the formation of an electrostatic multipolar field. As a result, the main stream was redirected towards a rotating take up unit, collecting the twisted yarn consisting of uniaxially aligned nanofibers. The yarns were then treated in boiling water under tension and their...
Experimental investigation of the effect of smart water and a novel synthetic nanocomposite on wettability alteration, interfacial tension reduction, and EOR
, Article Journal of Petroleum Exploration and Production Technology ; Volume 13, Issue 11 , 2023 , Pages 2251-2266 ; 21900558 (ISSN) ; Jafarbeigi, E ; Ahmadi, Y ; Hosseini, H ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2023
Abstract
Recently, smart water (SmW) and nanocomposite (NC) flooding have shown good potential for enhanced oil recovery (EOR) processes. Although SmW and NCs are found to influence the oil recovery, there are still some controversies regarding their performance on wettability alteration (WA). To address this important question, we synthesized new NC materials with high hydrophilic properties. In this research, in the first stage, a NC was synthesized. The obtained compound was known as (UiO-66-NH2/TiO2/ZnO) (UNTZ). For the identification of NC, scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), Fourier transform infrared spectroscopy (FTIR), and X-ray Diffraction (XRD) techniques were...
Techno–Econo–Enviro Energy Analysis, Ranking and Optimization of Various Building-Integrated Photovoltaic (BIPV) Types in Different Climatic Regions of Iran
, Article Energies ; Volume 16, Issue 1 , 2023 ; 19961073 (ISSN) ; Yousefi, Y ; Pishkar, I ; Hosseini Dehshiri, J ; Hosseini Dehshiri, S ; Fatemi Vanani, M ; Sharif University of Technology
MDPI
2023
Abstract
Iran is one of the most energy-consuming countries, especially in the construction sector, and more than 40% of its energy consumption is in the construction sector. Therefore, considering the very high potential of Iran in the field of solar energy, the need to pay attention to providing part of the energy required by buildings by solar energy seems necessary. The study of the effect of climate on the performance of a BIPV has not been done in Iran so far. Also, the use of ranking methods using the weighting of parameters affecting the performance of BIPV has not been done so far. The purpose of this study is to investigate the power supply of BIPV connected to the grid in the eight...
Ceria reinforced nanocomposite solder foils fabricated by accumulative roll bonding process
, Article Journal of Materials Science: Materials in Electronics ; Volume 23, Issue 9 , September , 2012 , Pages 1698-1704 ; 09574522 (ISSN) ; Kokabi, A. H ; Miyashita, Y ; Mutoh, Y ; Rezayat, M ; Madaah Hosseini, H. R ; Sharif University of Technology
Springer
2012
Abstract
As one of the key technologies for high performance electronic devices, composite solders have been recently developed to improve thermal and mechanical properties of solder joints. In this study, accumulative roll bonding process was used as an effective alternative method for manufacturing high-strength, finely dispersed, void-free and highly uniform Sn-Ag-Cu/CeO 2 nanocomposite solders. Microstructural investigation of nanocomposite solders revealed that homogenous distribution of CeO 2 nanoparticle has been achieved and the eutectic as-cast morphology of the solder changed to recrystallized fine grained structure. As a result of severe plastic deformation during rolling, brittle and...
Catalytic activity of the spinel ferrite nanocrystals on the growth of carbon nanotubes
, Article Journal of Superconductivity and Novel Magnetism ; Volume 26, Issue 2 , 2013 , Pages 429-435 ; 15571939 (ISSN) ; Daadmehr, V ; Rezakhani, A. T ; Shahbaz Tehrani, F ; Aghakhani, F ; Gholipour, S ; Sharif University of Technology
2013
Abstract
We prepared three ferrite nanocatalysts: (i) copper ferrite (CuFe 2O4) (ii) ferrite where cobalt was substituted by nickel (Nix Co1-x Fe2O4, with x=0, 0.2, 0.4, 0.6), and (iii) ferrite where nickel was substituted by zinc (Zn y Ni1-y Fe2O4 with y=1, 0.7, 0.5, 0.3), by the sol-gel method. The X-ray diffraction patterns show that the ferrite samples have been crystallized in the cubic spinel structural phase. We obtained the size of grains by field emission scanning electron microscopy images and their magnetic properties by vibrating sample magnetometer. Next, carbon nanotubes were grown on these nanocatalysts by the catalytic chemical vapor deposition method. We show that the catalytic...
Classification of normal and diseased liver shapes based on spherical harmonics coefficients
, Article Journal of Medical Systems ; Vol. 38, issue. 5 , April , 2014 ; ISSN: 01485598 ; Zoroofi, R. A ; Tehrani-Fard, A. A ; Akhlaghpoor, S ; Sato, Y ; Sharif University of Technology
2014
Abstract
Liver-shape analysis and quantification is still an open research subject. Quantitative assessment of the liver is of clinical importance in various procedures such as diagnosis, treatment planning, and monitoring. Liver-shape classification is of clinical importance for corresponding intra-subject and inter-subject studies. In this research, we propose a novel technique for the liver-shape classification based on Spherical Harmonics (SH) coefficients. The proposed liver-shape classification algorithm consists of the following steps: (a) Preprocessing, including mesh generation and simplification, point-set matching, and surface to template alignment; (b) Liver-shape parameterization,...