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computational-analysis
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A computational model for health monitoring of storage tanks using fiber Bragg grating optical fiber
, Article Journal of Civil Structural Health Monitoring ; Volume 1, Issue 3-4 , 2011 , Pages 97-102 ; 21905452 (ISSN) ; Zabihollah, A ; Sharif University of Technology
Abstract
Storage tanks are always under different hazards such as corrosion and leaking. In this work we have introduced a computational analysis on storage tanks in which a real-time yet efficient monitoring technique using Fiber Bragg Grating (FBG) sensors for corrosion detection on the bottom plate and vibration monitoring on outer surfaces of storage tanks is proposed. A finite element model for the tank is developed, in which the outer tanks surfaces are considered as plate elements and FBG sensors as beam elements. An array of FBG sensors is utilized to compute the generated strain in the FBGs due to losing thickness in the tank's bottom plate and due to vibration on the outer surfaces in...
Azaborininones: synthesis and structural analysis of a carbonyl-containing class of azaborines
, Article Journal of Organic Chemistry ; Volume 82, Issue 10 , 2017 , Pages 5380-5390 ; 00223263 (ISSN) ; Mukhtar, A ; Saeednia, B ; Sherafat, F ; Kelly, C. B ; Molander, G. A ; Sharif University of Technology
Abstract
An approach to access azaborininones (carbonyl-containing, boron-based heterocyclic scaffolds) using simple reagents and conditions from both organotrifluoroborates and boronic acids is described. An inexpensive, common reagent, SiO2, was found to serve as both a fluorophile and desiccant to facilitate the annulation process across three different azaborininone platforms. Computational analysis of some of the cores synthesized in this study was undertaken to compare the azaborininones with the analogous carbon-based heterocyclic systems. Computationally derived pKa values, NICS aromaticity calculations, and electrostatic potential surfaces revealed a unique isoelectronic/isostructural...
Airborne turbines: The impact of scaling on system performance
, Article ASME 2017 International Mechanical Engineering Congress and Exposition, IMECE 2017, 3 November 2017 through 9 November 2017 ; Volume 6 , 2017 ; 9780791858417 (ISBN) ; Goudarzi, N ; ASME ; Sharif University of Technology
American Society of Mechanical Engineers (ASME)
2017
Abstract
Tethered airborne wind energy systems are among emerging renewable energy technologies in recent years. These systems can harness greater power densities at higher altitudes with lower costs of installation and energy production in comparison with those from conventional ground-based energy harnessing technologies. A Buoyant Airborne Turbine (BAT) as a flying aerostat has a horizontal axis wind turbine within its shell and can elevate up to 600m. There are a number of pertinent parameters such as BAT configurations/component dimensions or its aerodynamic characteristics that impact the system total power performance. Identifying the optimum values of these parameters by conducting...
Pressure sensor based on patterned laser scribed reduced graphene oxide; experiment & modeling
, Article 5th International Conference on Orange Technologies, ICOT 2017, 8 December 2017 through 10 December 2017 ; Volume 2018-January , 2018 , Pages 15-17 ; 9781538632758 (ISBN) ; Paryavi, M ; Asadian, E ; Mohammadpour, R ; Rafii-Tabar, H ; Sasanpour, P ; IEEE Singapore SMC Chapter; Singapore Tourism Board (STB) ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
A low cost nanostructure pressure sensor has been designed, fabricated and tested based on graphene structure. The sensor structure is composed of the period structure of graphene oxide/reduced graphene oxide. The structure is fabricated by laser scanning system, where a beam of laser will convert the graphene oxide substrate to reduced graphene oxide. The geometrical structure of the sensor has been designed and optimized using computational analysis with Finite Element Method. The results of measurements show that the sensor structure is capable of measuring 1.45 kPa. The proposed sensor structure can be exploited in the application of electronic skin, synthetic tissue and robotic...
Computational analysis of ground effects on the dynamical behavior of unconfined two-phase clouds in view of detonability studies
, Article Scientia Iranica ; Volume 12, Issue 4 , 2005 , Pages 414-425 ; 10263098 (ISSN) ; Doustdar, M. M ; Hosseinalipour, M ; Sharif University of Technology
Sharif University of Technology
2005
Abstract
A numerical analysis has been performed to investigate the ground effects on the main parameters of a two-phase unconfined cloud of fuel and air to study its detonability. Equivalence ratio, turbulence intensity, cloud shape and volume, uniformity, temperature gradient and delay time distribution are the most important factors that affect the detonability of a vapor cloud. The effects of the altitude of the dispersing device from the ground on these significant factors have been demonstrated. A modified KIVA-based program has been employed to carry out the computations. A finite volume method is used to solve the equations describing the gas phase. A discrete particle technique is applied to...
Numerical study of aero- acoustic characteristics in an automotive air-intake system
, Article 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life ; Volume 7 , 2013 , Pages 5990-5999 ; 9781632662675 (ISBN) ; Beigmoradi, S ; Sharif University of Technology
OAL-Osterreichischer Arbeitsring fur Larmbekampfung
2013
Abstract
Compartment noise has gained significant importance to meet customer expectation. One of the dominant sources of noise from whole engine as a system is the one which is induced from fresh air intake. Geometrical features in air induction systems (AIS) airflow path are often responsible for unusual noise due to the complex air flow structure and its interaction with the internal acoustic field. To reduce air intake noise basically resonator and expansion chamber are used on automotive vehicles. Resonators are widely used for noise reduction of air induction systems. Although, airflow bench tests are faster to evaluate various alternate design geometries, understanding the mechanism of such...
Efficient geometry of surface plasmon resonance based fiber optic sensor
, Article 2018 IEEE 38th International Conference on Electronics and Nanotechnology, ELNANO 2018 - Proceedings, 24 April 2018 through 26 April 2018 ; 2018 , Pages 351-354 ; 9781538663837 (ISBN) ; Ahmadi, M ; Mohammadpour, R ; Sasanpour, P ; Sharif University of Technology
Abstract
The efficient structure for optical fiber based surface Plasmon resonance sensor has been investigated. The sensor structure is based on removing the cladding of a multimode optical fiber and replacing it with thin film of gold. The incident light inside the fiber will excite surface plasmons which will be resulted in the absorption in specific wavelengths. The absorption behavior is dependent on the dielectric constants at the vicinity of the metallic thin film. Based on the amount of removed cladding and deposition regions on the core structure of the fiber, different configurations can be considered. Based on the computational analysis, we have studied performance of sensor for three...
Design of a marker-based human motion tracking system
, Article Biomedical Signal Processing and Control ; Volume 2, Issue 1 , 2007 , Pages 59-67 ; 17468094 (ISSN) ; Hoviattalab, M ; Rezaeian, T ; Alizadeh, M ; Bostan, M ; Mokhtarzadeh, H ; Sharif University of Technology
2007
Abstract
In this paper a complete design of a high speed optical motion analyzer system has been described. The main core of the image processing unit has been implemented by the differential algorithm procedure. Some intelligent and conservative procedures that facilitate the search algorithm have also been proposed and implemented for the processing of human motions. Moreover, an optimized modified direct linear transformation (MDLT) method has been used to reconstruct 3D markers positions which are used for deriving kinematic characteristics of the motion. Consequently, a set of complete tests using some simple mechanical devices were conducted to verify the system outputs. Considering the system...
Structural and theoretical exploring of noncovalent interactions in Chlorido- and Nitrito-rhenium(I) tricarbonyl complexes bearing 2,3-Butadiene-bis(2-nitrobenzylidene)hydrazine Ligand: Intramolecular Re–κ1-endo-ONO(lone pair)…π*(C[tbnd]O) interaction
, Article Inorganica Chimica Acta ; Volume 540 , 2022 ; 00201693 (ISSN) ; Heshmatnia, F ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Herein, we report the synthesis, characterization and combined structural and full computational analysis of noncovalent interactions in a new hydrazine ligand and its two chlorido- and endo-nitrito-rhenium(I) tricarbonyl complexes. The analysis of crystal structures has been accompanied by comprehensive computational studies of the noncovalent interactions utilizing the quantum theory of atoms in molecules (QTAIM), natural bond orbitals (NBO), independent gradient model (IGM), and electron localization function (ELF) to shed light on the nature of the interactions. On the other hand, comprehensive energy decomposition analysis (EDA) by extended transition state coupled with natural orbitals...
Large deformation of shape-memory polymer-based lattice metamaterials
, Article International Journal of Mechanical Sciences ; Volume 232 , 2022 ; 00207403 (ISSN) ; Jebellat, E ; Roudbarian, N ; Mohammadi, K ; Movahhedy, M. R ; Asle Zaeem, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Through advanced computational analysis, this work demonstrates that metamaterial structures when made by shape-memory polymers (SMPs) can provide unique intelligent mechanical behavior. For the first time, geometrical effects, pertaining to low and ultra-low densities, on the thermomechanical behavior of SMP-based octet-truss lattice meta-structures are studied in this work. A reliable constitutive thermo-visco-hyperelastic model is applied to analyze the shape-memory behavior of several designed octet-truss lattices with ultra-low and low relative densities, ranging from 0.04 to 0.23. Different compressive strain values are tested to determine the effect of pre-straining. It is concluded...
Computational analysis of nanofluid effects on convective heat transfer enhancement of micro-pin-fin heat sinks
, Article International Journal of Thermal Sciences ; Volume 58 , 2012 , Pages 168-179 ; 12900729 (ISSN) ; Feizbakhshi, M ; Sharif University of Technology
Elsevier
2012
Abstract
Numerical investigation on the application of nanofluids in Micro-Pin-Fin Heat Sinks (MPFHSs) has been presented in this paper. To investigate flow and heat transfer behavior in MPFHS the three-dimensional steady Navier-Stokes and energy equations were discretized using a finite volume approach and have been solved iteratively, using the SIMPLE algorithm. DI-water is used as a base coolant fluid while the nanoparticles used in the present study are CuO nanoparticles with mean diameters of 28.6 and 29 nm and Al 2O 3 nanoparticles with mean diameters of 38.4 and 47 nm. The results show that (i) a significant enhancement of heat transfer in the MPFHS due to suspension of CuO orAl 2O 3...
Energy, exergy and thermoeconomic analysis of a combined cooling, heating and power (CCHP) system with gas turbine prime mover
, Article International Journal of Energy Research ; Volume 35, Issue 8 , June , 2011 , Pages 697-709 ; 0363907X (ISSN) ; Amidpour, M ; Karimkashi, S ; Rezayan, O ; Sharif University of Technology
2011
Abstract
In this paper energy, exergy and thermoeconomic analysis of a combined cooling, heating and power (CCHP) system has been performed. Applying the first and second laws of thermodynamics and economic analysis, simultaneously, has made a powerful tool for the analysis of energy systems such as CCHP systems. The system integrates air compressor, combustion chamber, gas turbine, dual pressure heat recovery steam generator (HRSG) and absorption chiller to produce cooling, heating and power. In fact, the first and second laws of thermodynamics are combined with thermoeconomic approaches. Next, computational analysis is performed to investigate the effects of below items on the fuel consumption,...
Mathematical modeling of CSF pulsatile hydrodynamics based on fluid-solid interaction
, Article IEEE Transactions on Biomedical Engineering ; Volume 57, Issue 6 , 2010 , Pages 1255-1263 ; 00189294 (ISSN) ; Bastani, D ; Najarian, S ; Ganji, F ; Farmanzad, F ; Seddighi, A. S ; Sharif University of Technology
2010
Abstract
Intracranial pressure (ICP) is derived from cerebral blood pressure and cerebrospinal fluid (CSF) circulatory dynamics and can be affected in the course of many diseases. Computer analysis of the ICP time pattern plays a crucial role in the diagnosis and treatment of those diseases. This study proposes the application of Linninger et al.s [IEEE Trans. Biomed. Eng. , vol. 52, no. 4, pp. 557565, Apr. 2005] fluidsolid interaction model of CSF hydrodynamic in ventricular system based on our clinical data from a group of patients with brain parenchyma tumor. The clinical experiments include the arterial blood pressure (ABP), venous blood pressure, and ICP in the subarachnoid space (SAS). These...