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Treatment of wastewatercontaining carbohydrates usingpichia saitoi culture
, Article International Journal of Engineering, Transactions B: Applications ; Volume 17, Issue 3 , 2004 , Pages 209-218 ; 1728-144X (ISSN) ; Yaghmaei, S ; Maghsoodi, V ; Sharif University of Technology
National Research Center of Medical Sciences
2004
Abstract
Treatment of wastewater containing carbohydrates by Pichia saitoi growing on beet molasses was investigated in a well-mixed continuous tank as an alternative to bulking control. The yeast strain that used in this work was isolated from non-alcoholic beverage industrial wastewater, with a view on TOC removal compared with other strains in previous study.In this research the isolated yeast showed high COD and TOC removal at three hydraulic retention times, HRT= 48, 24 and 18 hours.Maximum COD and TOC reductions were obtained at HRT=48 hours, which were 96% and 88%, respectively.The influent COD and TOC were 2500 and 148 mg/1, respectively.The pH maintained for synthetic wastewater was about...
Wind-tolerant optimal closed loop controller design for a domestic atmospheric research airship
, Article Mechanics Based Design of Structures and Machines ; 2020 ; Pourtakdoust, S. H ; Pazooki, F ; Sharif University of Technology
Taylor and Francis Inc
2020
Abstract
Airships are inherently sensitive to random atmospheric disturbances that could potentially make their data gathering and observation missions a formidable task. In this context robust closed loop feedback controllers are important. The present study is therefore focused on optimal feedback controller design of an indigenous domestically designed airship (DA) for added robustness against atmospheric disturbances. While the general airship six degrees of freedom (6DoF) governing equations of motion are mathematically nonlinear, one often needs to resort to local linearization methods to benefit from proven linear closed loop controller (CLC) design approaches. In this sense an optimal linear...
Wind-tolerant optimal closed loop controller design for a domestic atmospheric research airship
, Article Mechanics Based Design of Structures and Machines ; Volume 50, Issue 6 , 2022 , Pages 2046-2066 ; 15397734 (ISSN) ; Pourtakdoust, S. H ; Pazooki, F ; Sharif University of Technology
Taylor and Francis Ltd
2022
Abstract
Airships are inherently sensitive to random atmospheric disturbances that could potentially make their data gathering and observation missions a formidable task. In this context robust closed loop feedback controllers are important. The present study is therefore focused on optimal feedback controller design of an indigenous domestically designed airship (DA) for added robustness against atmospheric disturbances. While the general airship six degrees of freedom (6DoF) governing equations of motion are mathematically nonlinear, one often needs to resort to local linearization methods to benefit from proven linear closed loop controller (CLC) design approaches. In this sense an optimal linear...
Targeted drug delivery of microbubble to arrest abdominal aortic aneurysm development: a simulation study towards optimized microbubble design
, Article Scientific Reports ; Volume 10, Issue 1 , 2020 ; Ebrahimi, S ; Amani, A ; Fallah, F ; Sharif University of Technology
Nature Research
2020
Abstract
Abdominal aortic aneurysm (AAA) is an irreversible bulge in the artery with higher prevalence among the elderlies. Increase of the aneurysm diameter by time is a fatal phenomenon which will lead to its sidewall rupture. Invasive surgical treatments are vital in preventing from AAA development. These approaches however have considerable side effects. Targeted drug delivery using microbubbles (MBs) has been recently employed to suppress the AAA growth. The present study is aimed to investigate the surface adhesion of different types of drug-containing MBs to the inner wall of AAA through ligand-receptor binding, using fluid-structure interaction (FSI) simulation by using a patient CT-scan...
Effect of material and population on the delivery of nanoparticles to an atherosclerotic plaque: a patient-specific in silico study
, Article Langmuir ; Volume 37, Issue 4 , 2021 , Pages 1551-1562 ; 07437463 (ISSN) ; Shamloo, A ; Barzegar, S ; Forouzandehmehr, M ; Sharif University of Technology
American Chemical Society
2021
Abstract
Coronary artery disease (CAD) is the prevalent reason of mortality all around the world. Targeting CAD, specifically atherosclerosis, with controlled delivery of micro and nanoparticles, as drug carriers, is a very proficient approach. In this work, a patient-specific and realistic model of an atherosclerotic plaque in the left anterior descending (LAD) artery was created by image-processing of CT-scan images and implementing a finite-element mesh. Next, a fluid-solid interaction simulation considering the physiological boundary conditions was conducted. By considering the simulated force fields and particle-particle interactions, the correlation between injected particles at each cardiac...
Particles focusing and separation by a novel inertial microfluidic device: divergent serpentine microchannel
, Article Industrial and Engineering Chemistry Research ; Volume 61, Issue 38 , 2022 , Pages 14324-14333 ; 08885885 (ISSN) ; Shamloo, A ; Vatani, P ; Ebrahimi, S ; Sharif University of Technology
American Chemical Society
2022
Abstract
Microfluidic experiments have found wide applications in medical sciences and engineering, such as cell separation and focusing. In the present study, focusing and separation of particles with different sizes and densities were investigated by designing inertial microfluidic devices. The microfluidic channel is designed by analyzing the induced forces on the particles. In the designing process, the objective was to focus and separate the particles in the shortest length of the channel with the lowest possible cycles and high efficiency. The simulation is then used for analyzing the two proposed geometries to evaluate their particle separation and focusing ability, named convergent and...
Antioxidant nanomaterials in advanced diagnoses and treatments of ischemia reperfusion injuries
, Article Journal of Materials Chemistry B ; Volume 5, Issue 48 , 2017 , Pages 9452-9476 ; 20507518 (ISSN) ; Habibey, R ; Hajmiresmail, S. J ; Latifi, S ; Pazoki Toroudi, H ; Akhavan, O ; Sharif University of Technology
Royal Society of Chemistry
2017
Abstract
Organ ischemia with inadequate oxygen supply followed by reperfusion (which initiates a complex of inflammatory responses and oxidative stress) occurs in different clinical conditions and surgical procedures including stroke, myocardial infarction, limb ischemia, renal failure, organ transplantation, free-tissue-transfer, cardiopulmonary bypass, and vascular surgery. Even though pharmacological treatments protect against experimental ischemia reperfusion (I/R) injury, there has not been enough success in their application for patient benefits. The main hurdles in the treatment of I/R injury are the lack of diagnosis tools for understanding the complicated chains of I/R-induced signaling...
Stability of Cantilevered Beams Subjected to Random Follower Forces
, M.Sc. Thesis Sharif University of Technology ; Haddadpour, Hassan (Supervisor)
Abstract
In Mechanical systems there is always possibility of statical and dynamical following force. These forces are generated due to aerodynamic pressure, temperature gradient, and jet thrusters. In unstabel systems, if the value of this force exceeds a certaim amount the system becomes unstable. This value is called as critical force. In order to analyse these systems, fisrt of all, the governing dynamic equations are obtained by using the Galerkin-Ritz method. Then, by utilising the modal analysis, these equation are uncoupled. And then, the Ito set of equations are derived. By utilising the Lyapanov method, Ito equations are transfered to another state. and using the fokker-planc equation the...
A System Dynamics Model to Find Optimal Policies for competition and Development of Online Question and Answer Knowledge Markets
, M.Sc. Thesis Sharif University of Technology ; Kianfar, Farhad (Supervisor)
Abstract
Knowledge markets where knowledge transactions take place are today see increasingly expansion by influences of the Internet and the importance of knowledge. A competitive space, thus, has been placed among different enterprises step in knowledge markets. With no exception to this general rule, one of these markets covers online question – answer knowledge market. Google Answers is a proposed website in this area which, although being of interest in recent decades, its activities ended in 2006 for several reasons. Significantly, these markets consist of many factors with interrelated effects on each other and this leads to complexity of systems. Therefore, in order to study these markets, it...
Comparison of ultrasonic wave radiation effects on asphaltene aggregation in toluene-pentane mixture between heavy and extra heavy crude oils
, Article Journal of Energy Resources Technology, Transactions of the ASME ; Volume 134, Issue 2 , 2012 ; 01950738 (ISSN) ; Najafi, I ; Ghazanfari, M. H ; Amani, M ; Sharif University of Technology
2012
Abstract
In this study, it is aimed to compare the efficiency of ultrasonic wave technology on asphaltene flocculation inhibition of crude oils with different American Petroleum Institute (API) gravities. A set of confocal microscopy test is performed and a series of statistical analysis is done. According to the results of this study, there is an optimum radiation time for both crudes at which the viscosity and the flocculation rate of asphaltenic crude oils reduces to its minimum. This optimum appears at later times of radiation for extra heavy oil. Also, it is shown that the rate of changes in the properties measured in this study is sharper for extra heavy crude oil. It could be concluded that...
Synthesis and characterization of metal dithiocarbamate derivatives of 3-((pyridin-2-yl)methylamino)propanenitrile: Crystal structure of [3-((pyridin-2-yl)methylamino)propanenitrile dithiocarbamato] nickel(II)
, Article Polyhedron ; Volume 102 , 2015 , Pages 643-648 ; 02775387 (ISSN) ; Torabi, S ; Amani, V ; Notash, B ; Saidi, M. R ; Sharif University of Technology
Elsevier Ltd
2015
Abstract
Four metal dithiocarbamate complexes (Zn, Ni, Hg and Sn) based on an amine containing pyridyl and nitrile groups, 3-((pyridin-2-yl)methylamino)propanenitrile, were prepared and characterized by their elemental analysis, spectroscopic data (such as IR, 1H and 13C NMR), TGA analysis and X-ray crystallography of the Ni(II) complex. The presence of a band in the 1000 cm-1 region in the IR spectra, without any splitting, confirms the symmetrical bidentate bonding mode of the dithiocarbamate ligand. Also, the short thioureide C=N distance in the X-ray analysis of the Ni complex confirms the delocalization of π electrons over the S2CN moiety and strong double bond character between the carbon and...
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, 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...
Investigation of the reaction of dithiocarbamic acid salts with trimethyl orthoformate and styrene epoxide
, Article Tetrahedron Letters ; Volume 56, Issue 51 , December , 2015 , Pages 7124-7127 ; 00404039 (ISSN) ; Hajilou Shayegan, M ; Poshteh, S. S ; Amani, V ; Notash, B ; Hashemi, M. M ; Sharif University of Technology
Elsevier Ltd
2015
Abstract
The reaction of dithiocarbamic acid salts with trimethyl orthoformate in the presence of BF3·OEt2 was investigated to give 4-(N,N-dialkyldithiocarbamato)-2-dialkyliminio-1,3-dithietane tetrafluoroborates in good yields. Additionally, a one-pot procedure for the synthesis of 2-iminium-1,3-dithiolanes from the BF3·OEt2 catalyzed reaction of dithiocarbamic acid salts with styrene epoxide is described
Buckling behavior of composite triangular plates
, Article International Journal of GEOMATE ; Volume 2, Issue 2 , 2012 , Pages 253-260 ; 21862982 (ISSN) ; Heydarnia, E ; Amani, P ; Sharif University of Technology
GEOMATE International Society
2012
Abstract
This paper is to do a brief research on the buckling behavior of composite triangular plates with various edge boundary conditions and in-plane loads. It may be regarded as a right and simple numerical method for the analysis of composite triangular thin plate using the natural Area coordinates. Previous studies on the solution of triangular plates with different boundary conditions were mostly based on the Rayleigh-Ritz principle which is performed in the Cartesian coordinate. In this method, the energy functional of a general triangular plate is derived and the Rayleigh-Ritz method is utilized to derive the governing eigenvalue equation for the buckling problem. The geometry is presented...
A three-winding coupled-inductor high step-up boost converter with an active-clamp circuit
, Article 12th Power Electronics, Drive Systems, and Technologies Conference, PEDSTC 2021, 2 February 2021 through 4 February 2021 ; 2021 ; 9780738111971 (ISBN) ; Beiranvand, R ; Zolghadri, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2021
Abstract
A new high step-up boost converter with an active clamp circuit to eliminate voltage spike caused by leakage inductor is introduced in this paper. The introduced power converter has a high voltage gain for variable input voltage from 48V to 80V. Since both main and auxiliary switches turn on with zero voltage switching (ZVS) and all the diodes turn off under zero current switching (ZCS) condition, switching losses and EMI noises are strongly degraded. Therefore, the converter's efficiency is improved significantly. Simulation results show a 96.4% peak efficiency and 95.4% average efficiency. The proposed topology is suitable for low-input-voltage and low-output power applications such as...
A new high step-up interleaved LLC converter
, Article 12th Power Electronics, Drive Systems, and Technologies Conference, PEDSTC 2021, 2 February 2021 through 4 February 2021 ; 2021 ; 9780738111971 (ISBN) ; Beiranvand, R ; Zolghadri, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2021
Abstract
In this study, a new LLC resonant converter for high-voltage high-power applications is introduced. The introduced power converter is a two-phase interleaved full-bridge based that uses a transformer with secondary and tertiary windings to obtain higher output voltage. Zero voltage switching (ZVS) at MOSFETs turn on and zero current switching (ZCS) for all the output diodes at turn off are achieved for a wide range of input voltage (100 V-200 V) and output power (200 W-1500 W) variations. Simulation results show a 95% peak efficiency. © 2021 IEEE
A lightweight mutual authentication scheme for vanets between vehicles and RSUs
, Article ISeCure ; Volume 15, Issue 3 , 2023 , Pages 77-89 ; 20082045 (ISSN) ; Mohajeri, J ; Salmasizadeh, M ; Sharif University of Technology
Iranian Society of Cryptology
2023
Abstract
Vehicular Ad-hoc Networks (VANETs) have emerged as part of Intelligent Transportation Systems (ITS), offering the potential to enhance passenger and driver safety, as well as driving conditions. However, VANETs face significant security challenges and various attacks due to their wireless nature and operation in free space. Mutual authentication between vehicles and RSUs is one of the most, if not the most, critical security requirements in VANETs. In this process, maintaining resource authenticity, data authenticity and preserving users’ privacy, are key concerns. This paper proposes a pseudonym-based authentication scheme for VANETs, built upon existing approaches. The proposed scheme not...
Data-driven model-free adaptive control of z-source inverters
, Article Sensors ; Volume 21, Issue 22 , 2021 ; 14248220 (ISSN) ; Ahmadi, A ; Mohammadi, S ; Moradi Amani , A ; Marzband, M ; Mohammadi Ivatloo, B ; Sharif University of Technology
MDPI
2021
Abstract
The universal paradigm shift towards green energy has accelerated the development of modern algorithms and technologies, among them converters such as Z-Source Inverters (ZSI) are playing an important role. ZSIs are single-stage inverters which are capable of performing both buck and boost operations through an impedance network that enables the shoot-through state. Despite all advantages, these inverters are associated with the non-minimum phase feature imposing heavy restrictions on their closed-loop response. Moreover, uncertainties such as parameter perturbation, unmodeled dynamics, and load disturbances may degrade their performance or even lead to instability, especially when...
Quantifying the role of ultrasonic wave radiation on kinetics of asphaltene aggregation in a toluene-pentane mixture
, Article Petroleum Science and Technology ; Volume 29, Issue 9 , 2011 , Pages 966-974 ; 10916466 (ISSN) ; Mousavi, S. M. R ; Ghazanfari, M.H ; Ghotbi, C ; Ramazani, A ; Kharrat, R ; Amani, M ; Sharif University of Technology
2011
Abstract
Recently, ultrasonic wave technology has received much attention as a method for removal of asphaltene deposits from the near wellbore region. However, very little is known about another feature of this technology on the kinetics of asphaltene molecules aggregation. In this work, the kinetics of asphaltene flocculation in several crude oil samples exposed to ultrasonic waves for different time intervals is studied by confocal microscopy. The colloidal structural evolutions of flocks are described by analysis of size distribution of flocculated asphaltene particles. The results show that for the first 90 min of flocculation time, the size of aggregates increases rapidly, and a...
Selenium nanoparticles for targeted stroke therapy through modulation of inflammatory and metabolic signaling
, Article Scientific Reports ; Volume 9, Issue 1 , 2019 ; 20452322 (ISSN) ; Habibey, R ; Shokri, F ; Hajmiresmail, S. J ; Akhavan, O ; Mashaghi, A ; Pazoki Toroudi, H ; Sharif University of Technology
Nature Publishing Group
2019
Abstract
Ischemic cerebral stroke is a major cause of death and morbidity. Currently, no neuroprotective agents have been shown to impact the clinical outcomes in cerebral stroke cases. Here, we report therapeutic effects of Se nanoparticles on ischemic stroke in a murine model. Anti-transferrin receptor monoclonal antibody (OX26)-PEGylated Se nanoparticles (OX26-PEG-Se NPs) were designed and synthesized and their neuroprotective effects were measured using in vitro and in vivo approaches. We demonstrate that administration of the biodegradable nanoparticles leads to resolution of brain edema, protection of axons in hippocampus region, and myelination of hippocampal area after cerebral ischemic...