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A novel composite gold/gold nanoparticles/carbon nanotube electrode for frequency-stable micro-electrical impedance tomography
, Article Journal of Materials Science: Materials in Electronics ; Volume 31, Issue 13 , 2020 , Pages 10803-10810 ; Mohammadpour, R ; Rezanejad Gatabi, J ; Mirhoseini, M ; Sasanpour, P ; Sharif University of Technology
Springer
2020
Abstract
A novel electrode structure is introduced for micro-electrical impedance tomography. The composite electrode structure is made up of gold nanoparticles (AuNPs) and carbon nanotube (CNT) which are deposited on the surface. The nanostructure-based composition of electrodes improved the effective surface area, increased the double-layer capacitance of electrodes, and enhanced the electron transfer on the electrode–analyte interface. The proposed electrodes exhibit lower frequency-dependent electrical properties in impedance measurement. © 2020, Springer Science+Business Media, LLC, part of Springer Nature
Academic dishonesty at universities: The case of plagiarism among iranian language students
, Article Journal of Academic Ethics ; Volume 11, Issue 4 , 2013 , Pages 275-295 ; 15701727 (ISSN) ; Rezaei, S ; Sharif University of Technology
2013
Abstract
This study investigated Iranian language students' perception of and familiarity with plagiarism, their attitudes toward their professors regarding this issue, and their reasons for doing so. The participants were 122 undergraduate and graduate language students in Translation, Literature, TEFL, and Linguistics who filled out a validated and piloted questionnaire. Overall, the results indicated that students had different views about the definition of plagiarism and plagiarism was mostly perceived by students as using someone else's words as if they were their own rather than taking someone's ideas without permission. It was also found that in their academic career, students mostly consider...
Synthesis and swelling behavior of a new superabsorbent hydrogel network based on polyacrylamide grafted onto salep [electronic resource]
, Article Journal of Applied Polymer Science ; Volume 112, Issue 5, pages 2625–2633, 5 June 2009 ; Rezanejad Barajee, Ghasem ; Soleyman, Rouhollah ; Sharif University of Technology
Abstract
Synthesis and swelling behavior of a new superabsorbent hydrogel based on natural salep grafted with polyacrylamide is described. The new superabsorbent hydrogel biopolymer was synthesized via radical crosslinking and graft copolymerization of acrylamide monomer onto salep backbones. Regarding to the water absorption of hydrogel, the best synthesis condition is reported. FTIR spectroscopy and thermogravimetric analysis were used to confirm the structure of the final product and a mechanism for superabsorbent hydrogel formation was also suggested. After preparing the desired hydrogels based on optimum condition, several factors affecting the swelling behavior of hydrogel including pH of...
Down from the pedestal: Revisiting the exploit of literature in EFL language classes
, Article International Journal of Applied Linguistics and English Literature ; Volume 4, Issue 2 , 2015 , Pages 158-168 ; 22003592 (ISSN) ; Lari, Z ; Mosalli, Z ; Sharif University of Technology
Australian International Academic Centre PTY LTD
2015
Abstract
According to Arthur (2006, p. 200), “Through the use of literature, a language learning experience might become at the same time a source of immediate pleasure and satisfaction for the student. This possibility makes literature an appealing teaching device for ESL teachers”. However, numerous factors may contribute to the teachers’ lack of interest in using literary texts as a teaching tool. This study was an attempt to investigate Iranian EFL teachers’ attitude toward using literature in language classes and their perception toward the probable reasons of some teachers’ lack of interest in doing so. Altogether forty-four language teachers (19 females and 25 males, with a mean age of 26)...
Novel high capacity swelling superabsorbent composite and its potential for controlled release of fertilizers
, Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 29, Issue 4 , 2010 , Pages 113-123 ; 10219986 (ISSN) ; Soleyman, R ; Rezanejad Bardajee, G ; Sharif University of Technology
2010
Abstract
A hydrophilic macromolecular network is prepared by performing graft opolymerization of poly (sodium acrylate) chains onto salep and silica gel. The reaction parameters affecting the water absorbency of the superabsorbent composite were optimized using Taguchi method. FT-IR spectroscopy and Thermo Gravimetric Analysis (TGA) were used for confirming the structure of the final product and morphology of the synthesized superabsorbent composite was examined by SEM. The swelling behavior of optimum superabsorbent composite was measured in various swelling media. In addition, swelling kinetics and on-off switching behavior were investigated. In order to evaluate the controlled release potential of...
Dynamics of Protein-Embedded Vesicles in Simple Shear Flow
, M.Sc. Thesis Sharif University of Technology ; Jalali, Mir Abbas (Supervisor) ; Khoshnood, Atefeh (Co-Advisor)
Abstract
Studying the dynamics of vesicles in simple shear flow is the first step to decipher the dynamics of cells in flows or the motion of vesicle-based nanoparticles in vessels for drug delivery. The deformation of vesicle in shear flow changes the permeability of its membrane and may lead to its rupture, both of which correlate with the transportation of vesicle cargos to their environment, especially important in drug delivery. The deformation of vesicles in shear flow not only depends on the physical properties of the whole system, such as temperature, but also on the mechanical properties of three media: vesicle membrane plus vesicle’s inner and outer fluid. The effect of the mechanical...
Oxidation of Sulfides and Olefins in the Presence of Nanocluster Polyoxotungstate–intercalated Layered Double Hydroxide Nanoparticles as a Catalyst
, M.Sc. Thesis Sharif University of Technology ; Bagherzadeh, Mojtaba (Supervisor)
Abstract
In this study, polyoxometalate (POM) intercalated in the layered double hydroxide (LDH) was synthesized by a selective ion-exchange method. For this purpose, the nanocluster [VW12O40]3- was immobilized on the Mg2+/A13+/Cl–LDH support. The heterogeneous catalyst was characterized by FT-IR, XRD, SEM and analysis of ICP. The LDH-POM was applied as a catalyst in efficient oxidation of sulfides to sulfoxides using UHP as oxidant and CH3OH/ CH¬2¬Cl¬2 ¬as a solvent at room temperature, as well as epoxidation of olefins using TBHP as an oxidants and C¬2H4Cl2 as a solvent in 84°C. This catalyst showed excellent catalytic activities for a substrate/catalyst ratio (200:1). For example, this catalytic...
Effects of Graphene Nanopores and Temperature on DNA Sequencing Using Molecular Dynamics
, M.Sc. Thesis Sharif University of Technology ; Meghdari, Ali (Supervisor) ; Khoshnood, Atefeh (Co-Advisor)
Abstract
Distinguishing the structure of DNA is of outmost importance in the medicine and agriculture industry nowadays. Various methods have been suggested so far; however, high costs, incorrect results, and time-taking process are among main defects of them. Scientists try to find new ways for recognizing DNA structure and system in order to overcome such problems. One of these new methods is absorbing and passing DNA through Nano-pores in an electrolyte solution under the influence of an electrical field. The basis of this method is the ionized currents which occur due to the passing of DNA through Nano-pores. Because each DNA base pairs can form a barrier corresponding to a unique measured value,...
Long Period Variable Stars in the Local Group Galaxies
, M.Sc. Thesis Sharif University of Technology ; Rahvar, Sohrab (Supervisor) ; Javadi, Atefeh (Co-Supervisor)
Abstract
In this thesis, the star formation history and evolution of IC 1613 dwarf galaxy and NGC 5128 giant elliptical galaxy has been studied. About IC 1613, our result shows that the star formation history of the galaxy is roughly constant in 5 Gyr ago and this support that the galaxy had been isolated at least in 5 Gyr ago. About NGC 5128, we can see that the star formation rate has suddenly increased in 700 Myr and 3.5 Gyr ago. This results in very good agreement with literature support that the galaxy has experienced some mergers with smaller gas rich galaxies
Rating EFL Learner's Interlanguag Pragmatic Competence by Native and Non-native English Speaking Teachers
, M.Sc. Thesis Sharif University of Technology ; Alemi, Minoo (Supervisor) ; Eslami Rasekh, Zohreh (Co-Advisor)
Abstract
Pragmatic assessment and consistency in rating are among the subject matters which are still in need of more in-depth investigations. The significance of the issue is highlighted when remembering that inconsistency in ratings would surely damage the test fairness issue in assessment and lead to much diversity in ratings. The purpose of this study was investigating the criteria that native (American) and non-native (Iranian) English speaking teachers considered while rating the pragmatic productions of Iranian EFL learners regarding the two speech acts of compliment and compliment response. Overall, a hundred and twenty teachers (sixty native and sixty non-native raters) participated in this...
Study and Comparison the Incidence of Dutch Disease in Iranian Economy in Two Periods of Oil Shock
, M.Sc. Thesis Sharif University of Technology ; nili, Masoud (Supervisor) ; Madanizadeh, Ali (Supervisor)
Abstract
This paper studies and compares the effect of "Dutch disease" in Iranian economy in two periods of rising oil price (1973-1978) and (2004-2010). The study presents a DSGE model to analysis the behavior of economic variable in both periods and to address this question that whether or not policy maker has learning behavior. The model consists of households, final goods producers who divided in tradable goods and non-tradable goods sector and the government. I use calibration methods to estimate models parameters.Comparison of simulated results and the actual macroeconomic variables in Iran during 1338-1390 indicates that, first of all Dutch disease effect occur in both periods of oil shock so...
Sandblasting improves the performance of electrodes of miniature electrical impedance tomography via double layer capacitance
, Article Heliyon ; Volume 6, Issue 4 , 2020 ; Mohammadpour, R ; Gatabi, J. R ; Mirhoseini, M ; Ahmadi, M ; Sasanpour, P ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Effect of sandblasting of the copper electrode structures before deposition of gold thin film for micro electrical impedance tomography (EIT) system has been studied experimentally. The comparison has been performed on the unmodified copper electrodes and the sandblasted electrodes before deposition of gold layer, using structural analysis while their performance in EIT system has been measured and analyzed. The results of scanning electron microscopy and atomic force microscopy show that the sandblasting of the electrodes results in the deposition of gold film with smaller grain size and uniformly, comparing to the unmodified structure. The measurement of impedance shows that the...
The Effect of Hydrophobic Mismatch and Rigidity of Protein on the Cluster Formation of Transmembrane Proteins in Biomembranes
, M.Sc. Thesis Sharif University of Technology ; Ahmadiyan, Mohammad Taghi (Supervisor) ; Jalali, Mir Abbas (Co-Advisor) ; Khoshnood, Atefeh (Co-Advisor)
Abstract
Membrane proteins aggregation is a very important biological phenomenon in a variety of cell functions. It has been suggested that aggregation behavior of membrane proteins is influenced by the shape of the hydrophobic domain of the proteins, proteins hydrophobic mismatch and bilayer curvature. However, in this study by means of coarse grained membrane simulations it has been found that in thermal equilibrium, protein-protein interactions also depend on protein rigidity and structural strength. Based on simulation results, we have observed stable large clusters even in the absence of hydrophobic mismatch between lipids and proteins. Interestingly, our results also indicate that proteins with...