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    2-D microflow generation on superhydrophilic nanoporous substrates using epoxy spots for pool boiling enhancement

    , Article International Communications in Heat and Mass Transfer ; Volume 113 , April , 2020 Najafpour, S ; Moosavi, A ; Rad, S. V ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    We conduct an experimental investigation on the pool boiling enhancement in DI water on nanoporous surfaces. The surfaces are modified by anodic oxidation, and cavities with 2 mm diameter and pitches between 2.5 and 5 mm applied on them using EDM method filled with a two-part epoxy with low thermal conductivity properties. The capillary wicking action of the superhydrophilic nanoporous oxide layer enhances the rewetting and spreading of the liquid to dry-spots during boiling. The epoxy disks remain wet and prevent merging bubbles during the pool boiling experiment and a 2-D microflow is induced toward dried regions with synergic effects of nanoporous surface absorption, create a considerable... 

    A non-linear model for the classification of stored items in supply chain management

    , Article Proceedings 2010 International Symposium on Information Technology - System Development and Application and Knowledge Society, ITSim'10, 15 June 2010 through 17 June 2010 ; Volume 3 , June , 2010 , Pages 1636-1641 ; 9781424467181 (ISBN) Bozorgi Rad, S.Y ; Bozorgi Rad, M. A ; Ishak Desa, M ; Behnam, S ; Lessanibahri, S ; IEEE ; Sharif University of Technology
    2010
    Abstract
    With the significant role that warehouse plays in connection to suppliers, distributors, and clients, and considering the costliness of storage systems, efforts have focused on the reduction of procedural expenses. Among the most significant expenses, one involves the distance traveled by operators or S/R machinery for the selection of ordered items; the common solution to which has been through the classification of stored items. Previous articles have focused on linear solutions to the abovementioned problem, such as P-Median. This article shall focus on the problems arising from the said solution, and instead a non-linear method proposed. Further, a heuristic algorithm is produced for the... 

    Inhibitory activity on type 2 diabetes and hypertension key-enzymes, and antioxidant capacity of veronica persica phenolic-rich extracts

    , Article Cellular and Molecular Biology ; Volume 62, Issue 6 , 2016 , Pages 80-85 ; 01455680 (ISSN) Sharifi Rad, M ; Tayeboon, G. S ; Sharifi Rad, J ; Iriti, M ; Varoni, E. M ; Razazi, S ; Sharif University of Technology
    Cellular and Molecular Biology Association  2016
    Abstract
    Veronica genus (Plantaginaceae) is broadly distributed in different habitats. In this study, the inhibitory activity of free soluble and conjugated phenolic extracts of Veronica persica on key enzymes associated to type 2 diabetes (α-glucosidase and α-amylase) and hypertension (angiotensin I converting enzyme, ACE) was assessed, as well as their antioxidant power. Our results showed that both the extracts inhibited α-amylase, α-glucosidase and ACE in a dose-dependent manner. In particular, free phenolic extract significantly (P < 0.05) inhibited α-glucosidase (IC50 532.97 μg/mL), whereas conjugated phenolic extract significantly (P < 0.05) inhibited a-amylase (IC50 489.73 μg/mL) and ACE... 

    Design and implementation of a new body weight support (BWS) system

    , Article 5th RSI International Conference on Robotics and Mechatronics, IcRoM 2017, 25 October 2017 through 27 October 2017 ; 2018 , Pages 69-75 ; 9781538657034 (ISBN) Hamidi Rad, M ; Behzadipour, S ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2018
    Abstract
    Gait training is a critical rehabilitation procedure for patients suffering from walking problems. It, however, puts the therapist in high orthopedic risk since he should prevent the patient from possible falling. Body weight support system is a new technology helping such patients and the involved therapist by unloading a percent of the patient's weight. A new over-ground body weight support is introduced in this article. The system is composed of two main modules namely unloading and traction. The unloading module is capable of suspending an individual's weight up to 1000N dynamically. The whole system is attached to an overhead rail, moving over the head of the patient by the traction... 

    Failure analysis of superheater tube

    , Article Engineering Failure Analysis ; Volume 48 , February , 2015 , Pages 94-104 ; 13506307 (ISSN) Movahedi Rad, A ; Plasseyed, S. S ; Attarian, M ; Sharif University of Technology
    Elsevier Ltd  2015
    Abstract
    The failure analysis of a ruptured superheater tube after 20. years service in the oil-fueled boiler, as the typical problems in power plants, was investigated. A thin-lipped rupture at failed region was observed in superheater tube. By measuring the tube's wall thicknesses far from failed region, non-uniformity was seen. The suggested main root cause of failure was fireside corrosion of the tube during the service. Because of low grade of used fuel, sodium, sulfur, and vanadium elements were observed at the outer surface, which caused continuously scale formation and reduction of wall thickness, by metal consumption. In addition, it seems that it has been worsened by occurrence of long-term... 

    Electrochemical synthesis of doped TNT as a nano photocatalyst for color degradation applications

    , Article Desalination and Water Treatment ; Volume 28, Issue 1-3 , 2011 , Pages 23-27 ; 19443994 (ISSN) Asl, S. K ; Kianpour Rad, M ; Sadrnezhaad, S. K ; Sharif University of Technology
    Taylor and Francis Inc  2011
    Abstract
    The preparation of high aspect-ratio TiO2 nanotubes and their photocatalytic activity were demonstrated in this study. The high aspect-ratio TiO2 nanotube thin films were produced by electrochemical anodic oxidation of Ti in chloride-containing electrolytes. Nanotubes were doped with different concentrations of ZnO particles through anodization. The catalytic behavior was evaluated under batch reactor with photo-degradation test of Red Dye. The experimental results collectively demonstrate the successful ZnO doping of the resultant nanotube layers with significant abundant OH groups on their increased surfaces. The nanotubes doped with high content combined with an anatase as a two phase... 

    Inverse design of supersonic diffuser with flexible walls using a Genetic Algorithm

    , Article Journal of Fluids and Structures ; Volume 22, Issue 4 , 2006 , Pages 529-540 ; 08899746 (ISSN) Ziaei-Rad, S ; Ziaei-Rad, M ; Sharif University of Technology
    2006
    Abstract
    An efficient algorithm for the design optimization of the compressible fluid flow problem through a flexible structure is presented. The methodology has three essential parts: first the behavior of compressible flow in a supersonic diffuser was studied numerically in quasi-one-dimensional form using a flux splitting method. Second, a fully coupled sequential iterative procedure was used to solve the steady state aeroelastic problem of a flexible wall diffuser. Finally, a robust Genetic Algorithm was implemented and used to calculate the optimum shape of the flexible wall diffuser for a prescribed pressure distribution. © 2006 Elsevier Ltd. All rights reserved  

    RANS simulations of the stepped duct effect on the performance of ducted wind turbine

    , Article Journal of Wind Engineering and Industrial Aerodynamics ; Volume 145 , October , 2015 , Pages 270-279 ; 01676105 (ISSN) Zabihzade Roshan, S ; Alimirzazadeh, S ; Rad, M ; Sharif University of Technology
    Elsevier  2015
    Abstract
    With the rise in oil price and population growth, renewable energies are assumed to be the main source of energies for the next generation. Wind as a natural, eco-friendly and renewable source of energy has been at the center of concentration for decades. Recently there has been some ideas regarding the self-regulating urban wind turbines. Researchers have shown that a proper enclosure increases the wind velocity and therefore more torques can be exerted on the rotors, therefore more power can be generated. These enclosures are light and cheap, therefore they are applicable and effective. In the present study, an enclosure was modified to increase the exerted torque with implementing a step... 

    Non-fixed scatterers and their effects on MIMO multicarrier fading communication channels

    , Article 50th Annual IEEE Global Telecommunications Conference, GLOBECOM 2007, Washington, DC, 26 November 2007 through 30 November 2007 ; December , 2007 , Pages 3765-3769 ; 1424410436 (ISBN); 9781424410439 (ISBN) Saligheh Rad, H ; Gazor, S ; Shariatpanahi, P ; Sharif University of Technology
    2007
    Abstract
    There are two types of scatterers in a multipath propagation environment: fixed and non-fixed scatterers. Fixed scatterers like buildings, mountains and tree stems do not move, while non-fixed (moving) scatterers like cars, people and tree leaves move from their initial positions. In addition to different movements of the mobile station (MS) that cause different kinds of Doppler fading, movements of non-fixed scatterers are also anticipated to generate other kinds of fading/correlation. This fading changes depend on the type of the propagation environment and the type of movements of local surrounding scatterers. In this paper we characterize these effects in terms of temporal correlations.... 

    Designing a communication network using simulation

    , Article Scientia Iranica ; Volume 11, Issue 3 , 2004 , Pages 165-180 ; 10263098 (ISSN) Akhavan Niaki, S. T ; Besharati Rad, Z ; Sharif University of Technology
    Sharif University of Technology  2004
    Abstract
    In this paper, a private telephone communication network of an electrical energy distribution company has been studied analytically and through discrete event system simulation. Considering the pitfalls and difficulties associated with the analytical approach in designing such a network and the power and performance of a simulation methodology in this regard, a simulation model was developed using GPSS/H simulation language. After data collection and analysis, model development and validation, initial transient study and design of experimental phases, the model was applied to determine the operating performance of the current system, as well as to evaluate the performance of any newly... 

    Botulinum toxin a dissolving microneedles for hyperhidrosis treatment: design, formulation and in vivo evaluation

    , Article Biomaterials Science ; Volume 11, Issue 24 , 2023 , Pages 7784-7804 ; 20474830 (ISSN) Malek Khatabi, A ; Rad Malekshahi, M ; Shafiei, M ; Sharifi, F ; Motasadizadeh, H ; Ebrahiminejad, V ; Rad Malekshahi, M ; Akbarijavar, H ; Faraji Rad, Z ; Sharif University of Technology
    Royal Society of Chemistry  2023
    Abstract
    Multiple periodic injections of botulinum toxin A (BTX-A) are the standard treatment of hyperhidrosis which causes excessive sweating. However, BTX-A injections can create problems, including incorrect and painful injections, the risk of drug entry into the bloodstream, the need for medical expertise, and waste disposal problems. New drug delivery systems can substantially reduce these problems. Transdermal delivery is an effective alternative to conventional BTX-A injections. However, BTX-A's large molecular size and susceptibility to degradation complicate transdermal delivery. Dissolving microneedle patches (DMNPs) encapsulated with BTX-A (BTX-A/DMNPs) are a promising solution that can... 

    Comparative photodecolorization of red dye by anatase, rutile (TiO 2), and wurtzite (ZnO) using response surface methodology

    , Article Turkish Journal of Chemistry ; Volume 36, Issue 1 , 2012 , Pages 121-135 ; 13000527 (ISSN) Asl, S. K ; Sadrnezhaad, S. K ; Rad, M. K ; Üner, D ; Sharif University of Technology
    2012
    Abstract
    Treatment of dye pollution containing C.I. Acid Red 14 (AR14) by a coupled photocatalytic process was studied. Titanium dioxide, in the form of anatase and rutile, and zinc oxide, were used as photocatalysts. The investigated photocatalysts were Aldrich-produced nanopowders with crystallites of a mean size of 20-30 nm and a specific surface area of about 50 m 2/g. A comparison of TiO 2(anatase), TiO 2(rutile), TiO 2(a,r), and ZnO for the decolorization of the AR14 solution was performed. Results showed that color removal followed the decreasing order of TiO 2(a,r), ZnO > TiO 2(a,r) > TiO 2(a), ZnO > TiO 2(r), ZnO >TiO 2(a,r) > TiO 2(a) > ZnO > TiO 2(r). Response surface methodology (RSM) was... 

    Investigation of the Shaft Failure Connected to Extruder

    , Article Journal of Failure Analysis and Prevention ; Volume 15, Issue 6 , 2015 , Pages 775-781 ; 15477029 (ISSN) Pelaseyed, S. S ; Mashayekhi, F ; Movahedi-Rad, A ; Sharif University of Technology
    Springer New York LLC  2015
    Abstract
    In this study, the failure analysis of a shaft of a unit, which had been failed during the service, was studied. This shaft was welded to the blades, and their chemical compositions were determined by spectroscopy method. In order to determine the root cause of failure and contribution factors, different investigation methods including visual examination, optical microscopy and scanning electron microscope analysis, and hardness test were carried out. It was concluded that the shaft was failed due to fatigue. The failure was caused by improper welding of blades to the shaft. At the end, in order to prevent or decelerate such failure, some recommended remedies were suggested  

    BIM-based approach to conduct Life Cycle Cost Analysis of resilient buildings at the conceptual stage

    , Article Automation in Construction ; Volume 123 , 2021 ; 09265805 (ISSN) Rad, M.A.H ; Jalaei, F ; Golpour, A ; Hosseini Varzande, S. S ; Guest, G ; Sharif University of Technology
    Elsevier B.V  2021
    Abstract
    All costs within the life cycle of a building are known as its life cycle cost (LCC). In the design process of a building, the use of a lower initial cost index to select an option among others with similar performance may not lead to an economically optimal alternative during the life cycle. Hence, today, building designers and investors require a tool to estimate life cycle cost at the conceptual design stage to select an economically efficient option. Resilient solutions generally lead to a higher level of complexity and upfront costs and carry additional embodied environmental impact as well. This study aims to support the design of resilient buildings using a sound LCC methodology in... 

    Drag reduction in internal turbulent flow by fabricating superhydrophobic Al2O3/waterborne polyurethane coatings

    , Article Surface and Coatings Technology ; Volume 421 , 2021 ; 02578972 (ISSN) Rad, S. V ; Moosavi, A ; Nouri Boroujerdi, A ; Najafkhani, H ; Najafpour, S ; Sharif University of Technology
    Elsevier B.V  2021
    Abstract
    Nowadays, increasing the CO2 emissions are one of the inevitable challenges in the world. In addition, in many industries, fossil fuels are the main source of energy demands which worsen the problem. Since in most applications, the performance and energy loss are highly affected by the drag force, many investigations have been proposed to improve the surface properties to moving surface against the water, and consequently, increasing drag reduction. To this end, one effective way is utilizing superhydrophobic coatings. In this study, we prepare two different superhydrophobic coatings using Al2O3 nanoparticles (NPs) modified by HMDS (1,1,1,3,3,3-Hexamethyldisilazane) and PDMS... 

    Targeted synthesis of NIR luminescent rhenium diimine cis,trans-[Re(NN)(CO)2(L)2]n+ complexes containing N-Donor axial ligands: photophysical, electrochemical, and theoretical studies

    , Article ChemPlusChem ; Volume 85, Issue 11 , 2020 , Pages 2518-2527 Shakirova, J. R ; Nayeri, S ; Jamali, S ; Porsev, V. V ; Gurzhiy, V. V ; Levin, O. V ; Koshevoy, I. O ; Tunik, S. P ; Sharif University of Technology
    Wiley-VCH Verlag  2020
    Abstract
    The combined action of ultraviolet irradiation and microwave heating onto acetonitrile solution of [Re((Formula presented.))(CO)3(NCMe)]OTf ((Formula presented.) =phenantroline and neocuproine) afforded cis,trans-Re((Formula presented.))(CO)2(NCMe)2]+ acetonitrile derivatives. Substitution of relatively labile NCMe with a series of aromatic N-donor ligands (pyridine, pyrazine, 4,4’-bipyridine, N-methyl-4,4’-bipyridine) gave a novel family of the diimine cis,trans-[Re((Formula presented.))(CO)2(L)2]+ complexes. Photophysical studies of the obtained compounds in solution revealed unusually high absorption across the visible region and NIR phosphorescence with emission band maxima ranging from... 

    Finding an unknown object by using piezeoelectric material: A finite element approach

    , Article 2nd International Conference on Environmental and Computer Science, ICECS 2009, 28 December 2009 through 30 December 2009, Dubai ; 2009 , Pages 156-160 ; 9780769539379 (ISBN) Azizi, A ; Durali, L ; Zareie, S ; Parvari Rad, F ; Sharif University of Technology
    IEEE  2009
    Abstract
    This paper presents a method to determine material of an unknown sample object. The main objective of this study is to design a database for specifying material of an object. We produce the database for different materials which is subjected to different forces. For this purpose we use a Polyvinidilene Fluoride (PVDF) sensor which is a piezoelectric material. Also we study the effect of changing place of sensor on our study. The detailed design was performed using finite element method analysis. Furthermore, if we have an object which we do not know its material by use of this database we can find out what this object is and how much its Yanoung's modules is. This study will be suitable for... 

    Control of vibration suppression of a smart beam by pizoelectric elements

    , Article 2nd International Conference on Environmental and Computer Science, ICECS 2009, 28 December 2009 through 30 December 2009, Dubai ; 2009 , Pages 165-169 ; 9780769539379 (ISBN) Azizi, A ; Durali, L ; Rad, F. P ; Zareie, S ; Sharif University of Technology
    2009
    Abstract
    Vibration control is an essential problem in different structure. Smart material can make a structure smart, adaptive and self-controlling so they are effective in active vibration control. Piezoelectric elements can be used as sensors and actuators in flexible structures for sensing and actuating purposes. In this paper we use PZT elements as sensors and actuator to control the vibration of a cantilever beam. Also we study the effect of different types of controller on vibration. © 2009 IEEE  

    Perylene diimide-POSS network for semi selective solid-phase microextraction of lung cancer biomarkers in exhaled breath

    , Article Analytica Chimica Acta ; Volume 1198 , 2022 ; 00032670 (ISSN) Soufi, G ; Bagheri, H ; Yeganeh Rad, L ; Minaeian, S ; Sharif University of Technology
    Elsevier B.V  2022
    Abstract
    Lung cancer (LC) is the leading cause of cancer mortality so, the analysis of exhaled human breath has great significance for early non-invasive diagnosis. Poor selectivity and strong humidity are two bottlenecks for the application of gas sensors to exhaled breath analysis. The development of novel extractive phases for the analysis of exhaled breath by chromatography is therefore a lucrative object. Polyhedral oligomeric silsesquioxanes (POSS) are among the 3D porous materials whose unique properties make them promising coatings for solid-phase microextraction (SPME). Selective enrichment of polar or nonpolar targets depends on the pore size and functional groups on the POSSs. Herein, we... 

    New upper bounds on the energy of a graph

    , Article Match ; Volume 90, Issue 3 , 2023 , Pages 717-728 ; 03406253 (ISSN) Aashtab, A ; Akbari, S ; Jafari Rad, N ; Kamarulhaili, H ; Sharif University of Technology
    University of Kragujevac, Faculty of Science  2023
    Abstract
    The energy of a graph G, denoted by ε(G), is defined as the sum of the absolute values of all eigenvalues of G. It is proved in [MATCH Commun. Math. Comput. Chem. 79 (2018) 287-301] by Alawiah et al. that ε(G) ≤ 2√Δ+√(n - 2)(2m - 2Δ) for every bipartite graph G of order n, size m and maximum degree Δ. We prove the above bound for all graphs G. We also prove new types of two bounds of Koolen and Moulton given in [Adv. Appl. Math. 26 (2001) 47-52] and [Graphs Comb. 19 (2003) 131-135]. © 2023 University of Kragujevac, Faculty of Science. All rights reserved