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mohaghegh-zahed--l
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Nanoporous Ag2O photocatalysts based on copper terephthalate metal–organic frameworks
, Article Journal of Materials Science ; Volume 50, Issue 13 , 2015 , Pages 4536-4546 ; 00222461 (ISSN) ; Kamrani, S ; Tasviri, M ; Elahifard, M ; Gholami, M ; Sharif University of Technology
Kluwer Academic Publishers
2015
Abstract
We report the nanoporous Ag2O based on the copper terephthalate metal–organic frameworks (Ag2O/MOF) photocatalyst. Ag2O/MOF nanostructure was formed via oxygen treatment of Ag/MOF nanoparticles. The resulting Ag2O/MOF photocatalysts were characterised by various techniques. Results showed that the synthesised Ag2O/MOF nanocomposite exhibited dramatic separation of photoinduced electron/hole and excellent photodegradation activity under visible light irradiation. The degradation rate of acid blue 92 using Ag2O/MOF nanocomposite is found to be higher than that using pure MOF and Ag/MOF. It was divulged that the photodegradation rate is increased by oxygen treatment of Ag in Ag/MOF structure....
Level crossing analysis of growing surfaces
, Article Journal of Physics A: Mathematical and General ; Volume 36, Issue 10 , 2003 , Pages 2517-2524 ; 03054470 (ISSN) ; Sobhanian, S ; Rahimi Tabar, M. R ; Khorram, S ; Frootan, G. R ; Zahed, H ; Sharif University of Technology
2003
Abstract
We investigate the average frequency of positive slope v α+, crossing the height α = h - h̄ in the surface growing processes. The exact level crossing analysis of the random deposition model and the Kardar-Parisi-Zhang equation in the strong coupling limit before creation of singularities is given
Effects of Price Ceiling on Uniform Price Electricity Auction Markets
, M.Sc. Thesis Sharif University of Technology ; Ebrahimnejad, Ali (Supervisor) ; Mohaghegh, Mohsen (Supervisor)
Abstract
One of the most common applications of multi-unit auctions is the energy markets, including the electricity markets. In this study, using the simulation of a uniform price wholesale electricity market, the effects of the price ceiling on the behavior of power plants and market clearing prices have been investigated. The results show that the implication of price ceilings causes power plants to reduce the slope of their bidding function near the ceiling price, and as a result, the market-clearing price decreases compared to the previous state in the absence of the price ceiling. It was also observed that the higher the probability of reaching the price ceiling (higher total demand), the more...
Kinetics Investigation of Photocatalytic Degredation of Environmental Organic Pollutants Using ZnO-Zeolite Nano Composites
, M.Sc. Thesis Sharif University of Technology ; Gholami, Mohammad Reza (Supervisor) ; Sajadi, Ali Akbar (Supervisor)
Abstract
ZnO nano particles and mordnite zeolite nano particles were prepared by precipitation method and hydrothermal method,respectively. The influence of solvent and surfactant in ZnO nano particles synthesis were studied to reform the structure of nano particles.These nano particles were based on different supports to improve and enhance their photocatalytic activities. Synthesized catalysts characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform-infra red spectra (FTIR), UV-Vis spectroscopy and BET techniques. To investigated photocatalytic activity of the synthesized catalysts under UV irradiation, they were used to degradation bio-environmental...
The impact of religiosity on the disability, psychological well-being, and somatic health of multiple sclerosis patients
, Article Mental Health, Religion and Culture ; Volume 25, Issue 5 , 2022 , Pages 519-530 ; 13674676 (ISSN) ; Eslami, M ; Dadfar, M ; Lester, D ; Ayten, A ; Rashidizadeh, A ; Shirzad, F ; Sharif University of Technology
Routledge
2022
Abstract
The aim of the study was to predict disability, psychological wellbeing, and somatic health in multiple sclerosis (MS) patients with the mediating variable of religiosity. A sample of 128 patients was recruited, and were administered the Expanded Disability Status Scale, the World Health Organization-5 Well-Being Index, the Patient Health Questionnaire-15, and a Self-Rating Scale of Religiosity. Religiosity did not predict disability, psychological well-being, or somatic health. Religiosity was positively associated with MS duration and disability, but only in male patients. The predictors for predicting psychological wellbeing were age, disability, and somatic health. Patients with...
Investigation of Crystallization Behavior and Electrical Properties of Glass-Ceramics in the Li2O-TiO2-P2O5 System
, M.Sc. Thesis Sharif University of Technology ; Nemati, Ali (Supervisor) ; Eftekhari Yekta, Bijan (Supervisor) ; Banijamali, Sara (Co-Advisor)
Abstract
During the past two decades, much attention has been paid to rechargeable lithium batteries, because they have high energy density. Glass-ceramics is a category of this material, which may be of great potential as solid electrolytes.. The object of this thesis is preparation of Li2O-TiO2-P2O5 glass, glass-ceramic and investigation their electrical behavior. Prepared Samples were investigated by Differential thermal analysis (DTA), X-ray diffraction (XRD), Scanning electron microscopy (SEM), UV-Visible spectroscopy and Electrochemical impedance spectroscopy (EIS). In this study LiTi2(PO4)3 crystals were crystallized in a glass with the composition 45Li2O-25TiO2-30P2O5 (molar ratio). According...
A novel p–n junction Ag3PO4/BiPO4 based stabilized Pickering emulsions for highly efficient photocatalysis
, Article Rsc advances ; Issue, 5 , Jan , 2015 , 12944-12955 ; Tasviri, M. (Mahboubeh) ; Rahimic, E. (Esmail) ; Gholami, M. R. (Mohammad Reza) ; Sharif University of Technology
2015
Abstract
This study demonstrates a new kind of photocatalytic system via utilization of the superior specific properties inherent in Pickering emulsion. We designed the new photocatalytic system using a novel p–n heterojunction Ag3PO4/BiPO4 (AB) as a photocatalytic active component, multiwalled carbon nanotubes (MWCNTs) and graphene (GR) as a hydrophobic conducting nanostructure to form the stabilized Pickering emulsion. The photocatalytic activity of the as-prepared stabilized Pickering emulsion-based system (Pe-bp system) was studied by monitoring the change in Acid Blue 92 dye (AB92) concentration under both visible and UV light irradiation. The results revealed that the Pe-bp system exhibits a...
Impact of rock mineralogy on reservoir souring: A geochemical modeling study
, Article Chemical Geology ; Volume 555 , November , 2020 ; Zhang, L ; Liu, L ; Shabani, A ; Sharif University of Technology
Elsevier B. V
2020
Abstract
The petroleum industry suffers from reservoir souring phenomena, which has negative impacts on production facilities, health, and environment. Injection of incompatible water into the reservoir (waterflooding), which is considered as an enhanced oil recovery (EOR) method, is one of the most common causes of reservoir souring. In general, injected brine, especially seawater, contains high amounts of sulfate ion (SO42−). A high concentration of sulfate in the presence of sulfate-reducing bacteria (SRB) leads to the microbial reservoir souring. During this phenomenon, sulfide, specifically hydrogen sulfide gas (H2S) appears in the producing fluid of the reservoir. In this paper, a coupled...
A mechanobiological mathematical model of liver metabolism
, Article Biotechnology and Bioengineering ; Volume 117, Issue 9 , 5 June , 2020 , Pages 2861-2874 ; Firoozabadi, B ; Munn, L. L ; Sharif University of Technology
John Wiley and Sons Inc
2020
Abstract
The liver plays a complex role in metabolism and detoxification, and better tools are needed to understand its function and to develop liver-targeted therapies. In this study, we establish a mechanobiological model of liver transport and hepatocyte biology to elucidate the metabolism of urea and albumin, the production/detoxification of ammonia, and consumption of oxygen and nutrients. Since hepatocellular shear stress (SS) can influence the enzymatic activities of liver, the effect of SS on the urea and albumin synthesis are empirically modeled through the mechanotransduction mechanisms. The results demonstrate that the rheology and dynamics of the sinusoid flow can significantly affect...
cis-Dioxo-molybdenum(VI)-oxazoline complex catalyzed epoxidation of olefins by tert-butyl hydrogen peroxide
, Article Inorganica Chimica Acta ; Volume 362, Issue 10 , 2009 , Pages 3698-3702 ; 00201693 (ISSN) ; Tahsini, L ; Latifi, R ; Keith Woo, L ; Sharif University of Technology
2009
Abstract
A new efficient catalytic system was investigated for the epoxidation of various olefins by cis-dioxo-bis[2-(2′-hydroxyphenyl)-oxazolinato]molybdenum(VI), cis-[MoO2(phox)2], and TBHP as oxidizing agent. Using this system as catalyst for the oxidation of aliphatic substrates at 80 °C gives the epoxide as the sole product with yields up to 100% and turnover frequency up to 5000 h-1. The efficiency of the catalyst is strongly influenced by the nature of solvent, reaction time and temperature, and a significant increase in the epoxide yields is observed in higher temperatures and longer reaction times. © 2009 Elsevier B.V
Is negative attention better than no attention? The comparative effects of ostracism and harassment at work
, Article Organization Science ; Volume 26, Issue 3 , 2015 , Pages 774-793 ; 10477039 (ISSN) ; Robinson, S. L ; Berdahl, J. L ; Banki, S ; Sharif University of Technology
INFORMS Inst.for Operations Res.and the Management Sciences
2015
Abstract
Ostracism has been recognized as conceptually and empirically distinct from harassment. Drawing from theory and research that suggests that employees have a strong need to belong in their organizations, we examine the comparative frequency and impact of ostracism and harassment in organizations across three field studies. Study 1 finds that a wide range of employees perceive ostracism, compared with harassment, to be more socially acceptable, less psychologically harmful, and less likely to be prohibited in their organization. Study 2 surveyed employees from a variety of organizations to test our theory that ostracism is actually a more harmful workplace experience than harassment....
Dielectrophoretic cell sorting via sliding cells on 3D silicon microelectrodes
, Article Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS), 22 January 2017 through 26 January 2017 ; 2017 , Pages 147-150 ; 10846999 (ISSN) ; 9781509050789 (ISBN) ; Chan, M. L ; Roshan, K. A ; Yobas, L ; Sharif University of Technology
2017
Abstract
This work presents an innovative design for a flow-through dielectrophoretic cell sorting based on silicon bulk microelectrodes featuring sidewall undercuts. The microelectrodes are configured into an interdigitated array with digits extending across the flow chamber at an oblique angle against the flow stream. Target cells under dielectrophoretic forces and hydrodynamic drag can slide along the digits to a dedicated outlet. The design has been showcased for continuous-flow sorting of viable and non-viable mammalian cells, achieving a throughput of 16,600 cells/min, an order of magnitude higher than those reported for existing continuous-flow cell sorting designs using thin-film or...
A multi-scale model for determining the effects of pathophysiology and metabolic disorders on tumor growth
, Article Scientific Reports ; Volume 10, Issue 1 , 20 February , 2020 ; Firoozabadi, B ; Mozafari, A ; Munn, L. L ; Sharif University of Technology
Nature Research
2020
Abstract
The search for efficient chemotherapy drugs and other anti-cancer treatments would benefit from a deeper understanding of the tumor microenvironment (TME) and its role in tumor progression. Because in vivo experimental methods are unable to isolate or control individual factors of the TME and in vitro models often do not include all the contributing factors, some questions are best addressed with systems biology mathematical models. In this work, we present a new fully-coupled, agent-based, multi-scale mathematical model of tumor growth, angiogenesis and metabolism that includes important aspects of the TME spanning subcellular-, cellular- and tissue-level scales. The mathematical model is...
Deviatoric stress response envelopes from multiaxial tests on sand
, Article Solid Mechanics and its Applications ; Volume 146 , 2007 , Pages 253-262 ; 09250042 (ISSN); 9781402061455 (ISBN) ; Sadek, T ; Dihoru, L ; Lings, M. L ; Sharif University of Technology
Springer Verlag
2007
Abstract
Sets of rosettes of stress probes have been performed on Hostun sand in a flexible boundary true triaxial apparatus. These have shown the effect of stress history on the local distortional stiffness of the sand. Histories have included isotropic compression, and deviatoric paths with increasingly complex shapes. These tests were performed and interpreted against a background of kinematic hardening and bounding surface plasticity, using stress response envelopes to reveal evolving distortional stiffness. Use of response envelopes to study volumetric stiffness appears to be less helpful but the phase transformation surfaces that can be extracted seem somewhat independent of recent stress...
Gas chromatography with atomic emission detection: A powerful technique
, Article TrAC - Trends in Analytical Chemistry ; Volume 21, Issue 9-10 , 2002 , Pages 618-626 ; 01659936 (ISSN) ; Brinkman, U. A.Th ; Bagheri, H ; Sharif University of Technology
Elsevier
2002
Abstract
Atomic emission detection (AED) is a sensitive as well as a selective detection technique for gas chromatography (GC) and provides element-specific information. A rapidly increasing number of applications in many different areas illustrates the versatility and analytical power of the technique - especially when complex samples have to be analysed. The complementary use of GC-AED and GC with mass-spectrometric detection often yields the most rewarding results. © 2002 Published by Elsevier Science B.V. All rights reserved
A state-of-the-art model for spatial and stochastic oil spill risk assessment: A case study of oil spill from a shipwreck
, Article Environment International ; Volume 126 , 2019 , Pages 309-320 ; 01604120 (ISSN) ; Arneborg, L ; Lindgren, J. F ; Lindhe, A ; Rosén, L ; Raie, M ; Axell, L ; Hassellöv, I. M ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
Oil spills are serious environmental issues that potentially can cause adverse effects on marine ecosystems. In some marine areas, like the Baltic Sea, there is a large number of wrecks from the first half of the 20th century, and recent monitoring and field work have revealed release of oil from some of these wrecks. The risk posed by a wreck is governed by its condition, hazardous substances contained in the wreck and the state of the surrounding environment. Therefore, there is a need for a common standard method for estimating the risks associated with different wrecks. In this work a state-of-the-art model is presented for spatial and stochastic risk assessment of oil spills from...
Polymer-Supported Bis-1,2,4-triazolium ionic tag framework for an efficient Pd(0) catalytic system in biomass derived γ-valerolactone
, Article ACS Sustainable Chemistry and Engineering ; Volume 7, Issue 7 , 2019 , Pages 6939-6946 ; 21680485 (ISSN) ; Mahmoudi, H ; Bivona, L. A ; Piermatti, O ; Bagherzadeh, M ; Fusaro, L ; Aprile, C ; Marrocchi, A ; Vaccaro, L ; Sharif University of Technology
American Chemical Society
2019
Abstract
A resin-bound 1,2,4-triazolium ionic tag has been used as support for the preparation of solid palladium nanoparticles (Pd(0)-POLI-TAG-Pd). Owing to the pincer-type architecture of the triazolium ligand, the stabilization of a high amount of palladium nanoparticles (16 wt %) has been possible. The catalytic system has been fully characterized and used in low amounts (i.e., 0.1 mol % palladium loading) in representative Heck-Mizoroki cross-coupling processes. A negligible release of the metal was demonstrated, and a high activity was obtained over more runs. Besides, the protocol has been optimized for the use of safe biomass-derived γ-valerolactone reaction medium
Synthesis, crystal structure and catalytic activity of a novel Mo(VI)-oxazoline complex in highly efficient oxidation of sulfides to sulfoxides by urea hydrogen peroxide
, Article Inorganica Chimica Acta ; Volume 361, Issue 7 , 2008 , Pages 2019-2024 ; 00201693 (ISSN) ; Tahsini, L ; Latifi, R ; Ellern, A ; Woo, L. K ; Sharif University of Technology
Elsevier S.A
2008
Abstract
Novel molybdenum complex, cis-[MoO2(phox)2] has been synthesized and characterized by IR, 1H NMR, elemental analyses (CHN), and X-ray molecular structure determination methods. This complex was found to be an efficient, selective catalyst for the oxidation of various sulfides to sulfoxides with urea hydrogen peroxide (UHP) in excellent yields (100% for diallylsulfide) and short reaction times (20 min) at room temperature. The catalytic system oxidizes diallylsulfide chemoselectively to its corresponding sulfoxide without any over oxidation in double bond. © 2007 Elsevier B.V. All rights reserved
Exploring source water mixing and transient residence time distributions of outflow and evapotranspiration with an integrated hydrologic model and Lagrangian particle tracking approach
, Article Ecohydrology ; 2018 ; 19360584 (ISSN) ; Condon, L. E ; Danesh Yazdi, M ; Bearup, L. A ; Sharif University of Technology
John Wiley and Sons Ltd
2018
Abstract
Understanding the time water takes as it moves from rain or snowmelt through the terrestrial system to arrive as stream discharge, or evapotranspiration (ET) is an important hydrologic quantity. We develop a Lagrangian particle tracking method to capture transient residence times from source to either ET or outflow in an integrated hydrologic model. This method is parallel and efficiently captures time evolution of parcels of water in the model and tracks the source of water for hydrograph or ET separation. We demonstrate this model using hypothetical hillslope simulations driven by snow or rain dominated forcing and two different land cover types. We show that land cover and forcing both...
Optimized water consumption considering power plants efficiency in power system generation
, Article 2019 IEEE International Conference on Industrial Technology, ICIT 2019, 13 February 2019 through 15 February 2019 ; Volume 2019-February , 2019 , Pages 673-678 ; 9781538663769 (ISBN) ; Badakhshan, S ; Azizivahed, A ; Li, L ; Chen, L ; Huang, Q ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
In order to generate adequate electricity energy, conventional power plants utilize dramatic volume of water resources. Different methods such as replacing cutting-edge technologies of facilities have been proposed to diminish water consumption in this industry. Most of the approaches are considered as medium or long-term solution which requires substantial investment costs. Meanwhile, because of the process and technology, natural gas-fired power plants need less water among conventional power plants. Therefore, shifting unit commitment planning toward these power plants would aid to save water consumption. Nevertheless, overlooking combined cycle power plants can perform negative impact on...