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Experimental Study on Aerodynamic Deformation of Flexible Wings of an Ornithopter
, M.Sc. Thesis Sharif University of Technology ; Mazaheri, Karim (Supervisor)
Abstract
Flapping motions of flexible wings generate dynamic forces. These forces include aerodynamic forces and inertial forces due to angular acceleration of wing mass, that cause aeroelastic deformation of wings. In this thesis a method is presented by use of a software and some experimental test conditions to study elastic behaviors and aerodynamic forces of flexible wings. A high speed camera records motion of wings in hovering condition and then these images is processed with software to recognize deformations (such as deflection, torsion, etc.) and aerodynamic forces due to them. Afterwards aerodynamic model and deformations is combined for better modeling. Finally we can compare results with...
Influence of nickel and manganese on microstructure and mechanical properties of shielded metal arc-welded API-X80 steel
, Article Journal of Materials Engineering and Performance ; Volume 21, Issue 7 , July , 2012 , Pages 1447-1454 ; 10599495 (ISSN) ; Kokabi, A. H ; Sharif University of Technology
2012
Abstract
Microstructure developments of X80 weld metal by the addition of different amounts of alloying elements such as nickel and manganese to the covering of electrodes were investigated. For this reason, samples were welded with electrodes that Ni value has changed between 0.8 and 3.5% in two critical amounts of Mn 0.7 and 1.6. Optical microscopy and scanning electron microscopy were applied for peer investigation of microstructure. Different phase percentages were obtained by Clemex software and compared in all samples. Results indicated that Ni and Mn change weld microstructure in the as-deposited zone and reheated part and corresponding to each alloying element concentration, amount of...
One step synthesis of 14-alkyl- or aryl-14H-dibenzo[a,j]xanthenes using sodium hydrogen sulfate as catalyst
, Article Monatshefte fur Chemie ; Volume 139, Issue 6 , 2008 , Pages 605-608 ; 00269247 (ISSN) ; Hashemi, M. M ; Sharif University of Technology
2008
Abstract
A simple and environmentally benign procedure for the synthesis of 14-alkyl- or aryl-14H-dibenzo[a,j]xanthenes is described through a one-pot condensation of 2-naphthol with aryl or alkyl aldehydes in the presence of sodium hydrogen sulfate as a catalyst under solvent-free conditions. © 2008 Springer-Verlag
Oxidation of thiols to bisulfides by oxygen in presence of cobalt(ii) and manganese(ii) salts of 4-aminobenzoic acid supported on silica gel
, Article Monatshefte fur Chemie ; Volume 135, Issue 1 , 2004 , Pages 41-43 ; 00269247 (ISSN) ; Karimi Jaberi, Z ; Sharif University of Technology
2004
Abstract
A mixture of cobalt(II) and manganese(II) salts of 4-aminobenzoic acid supported on silica gel catalyses the oxidation of thiols to disulfides in the presence of oxygen or air
Introducing a Simulation-Based Model to Improve the Design and Layout of Workstations Inside Airport Terminals in Iran
, M.Sc. Thesis Sharif University of Technology ; Alvanchi, Amin (Supervisor)
Abstract
The airport terminal is difficult to plan and design due to the different components and the intricate complexity of its parts. At the airport terminal, we face a queue system which simulation is always a good way to analyze. In addition, computer simulation using modern softwares with the capability to model different types of systems, including the airport terminal, while being less realistic than analytical models, is less costly than operational Exercise.In this study, a supportive approach for better and specific management of Iranian airport terminal buildings with discrete-event simulation is proposed, considering the need for managing the airport terminals building in the country and...
N-Chlorosuccinimide: A simple and efficient reagent for the preparation of symmetrical disulfides
, Article Journal of Sulfur Chemistry ; Volume 27, Issue 2 , 2006 , Pages 165-167 ; 17415993 (ISSN) ; Ghafuri, H ; Karimi Jaberi, Z ; Sharif University of Technology
2006
Abstract
The efficient oxidative coupling of thiols to disulfides with N-chlorosuccinimide (NCS) at room temperature is described. Simple workup, economical method, high yields of products are some advantages of this method. © 2006 Taylor & Francis
Solid phase regeneration of carbonyl compounds by oxidative cleavage of carbon-nitrogen double bonds with molecular oxygen at room temperature
, Article Letters in Organic Chemistry ; Volume 3, Issue 2 , 2006 , Pages 121-122 ; 15701786 (ISSN) ; Akhbari, M ; Karimi Jaberi, Z ; Sharif University of Technology
2006
Abstract
Montmorillonite K10-supported manganese(II) chloride was found to be an efficient and convenient catalyst for the oxidative cleavage of oximes, phenylhydrazones and semicarbazones to the corresponding carbonyl compounds with molecular oxygen. © 2006 Bentham Science Publishers Ltd
Room temperature catalytic aromatization of Hantzsch 1,4-dihydropyridines by sodium nitrite in the presence of acidic silica gel
, Article Monatshefte fur Chemie ; Volume 137, Issue 2 , 2006 , Pages 197-200 ; 00269247 (ISSN) ; Ghafuri, H ; Karimi Jaberi, Z ; Sharif University of Technology
2006
Abstract
Various alkyl, aryl, and heterocyclic Hantzsch 1,4-dihydropyridines were converted to the corresponding pyridines in excellent yields and short times using sodium nitrite in the presence of a catalytic amount of acidic silica gel at room temperature. © Springer-Verlag 2006
Oxidation of aromatic alcohols to carbonyl compounds with oxygen catalyzed by iron (III) chloride supported on kieselguhr
, Article Letters in Organic Chemistry ; Volume 2, Issue 6 , 2005 , Pages 559-560 ; 15701786 (ISSN) ; Ezabadi, A ; Karimi Jaberi, Z ; Sharif University of Technology
2005
Abstract
Oxidation of aromatic alcohols to corresponding aldehydes and ketones have been carried out using molecular oxygen and FeCl3 supported on kieselguhr as catalyst in good yields. © 2005 Bentham Science Publishers Ltd
Sodium hypochlorite/montmorillonite K10: An effective oxidant for the oxidation of thiols to disulfides
, Article Letters in Organic Chemistry ; Volume 2, Issue 5 , 2005 , Pages 485-486 ; 15701786 (ISSN) ; Rahimi, A ; Karimi Jaberi, Z ; Sharif University of Technology
2005
Abstract
Sodium hypochlorite adsorbed on montmorillonite K10 is a useful oxidant for the oxidation of thiols to disulfides under the room temperature. © 2005 Bentham Science Publishers Ltd
Oxidation of benzylic methylene compounds to ketones with 4-aminoperoxybenzoic acid supported on silica gel in presence of oxygen or air
, Article Monatshefte fur Chemie ; Volume 135, Issue 2 , 2004 , Pages 185-188 ; 00269247 (ISSN) ; Ghazanfari, D ; Karimi Jaberi, Z ; Sharif University of Technology
2004
Abstract
4-Aminoperoxybenzoic acid supported on silica gel in presence of oxygen or air was found to be a convenient and selective oxidant for the oxidation of benzylic methylene compounds to the corresponding ketones
Copper chloride/kieselguhr: An efficient catalyst for oxidation of thiols to disulfides by molecular oxygen or air
, Article Journal of Chemical Research ; Issue 5 , 2004 , Pages 364-365 ; 03082342 (ISSN) ; Karimi Jaberi, Z ; Ghazanfari, D ; Sharif University of Technology
Scientific Reviews Ltd
2004
Abstract
Kieselguhr supported copper chloride catalyses the oxidation of thiols to disulfides in the presence of oxygen or air
Effect of alloying elements on weld metal mechanical properties in shielded metal Arc welded API-X 80 steel
, Article AIST Steel Properties and Applications Conference Proceedings - Combined with MS and T'10, Materials Science and Technology 2010, 17 October 2010 through 21 October 2010 ; October , 2010 , Pages 781-789 ; 9781935117131 (ISBN) ; Hoseini, H. M ; Kokabi, A. H ; Sharif University of Technology
2010
Abstract
Microstructure and mechanical properties development of X80 weld metal by addition of different amounts of alloying elements such as Nickel and Manganese to the covering of electrodes were investigated. For this reason samples were welded with electrodes that Ni value changed between 0.8%- 3.5% in tow critical amounts of Mn: 0.7 and 1.6. Tensile test and microhardness results indicated the suitable ranges of Ni and Mn for acceptable mechanical properties. In addition, optical microscopy and scanning electron microscopy were applied to link the microstructure with mechanical properties. The hardness of weld metals were found to increase linearly with Mn and Ni, which was attributed mainly to...
Solid state oxidation of phenols to quinones with ammonium persulfate/wet SiO2
, Article Journal of Chemical Research ; Issue 3 , 2005 , Pages 160-161 ; 03082342 (ISSN) ; Karimi Jaberi, Z ; Eftekhari Sis, B ; Sharif University of Technology
Scientific Reviews Ltd
2005
Abstract
A solid state method for the oxidation of phenols to quinones is described using ammonium persulfate/wet silica gel as oxidant
, M.Sc. Thesis Sharif University of Technology ; Alvanchi, Amin (Supervisor)
Abstract
Limited water resources in Iran have made dams an important part of the country’s infrastructure. As a result of the large number of in-progress and expected dam projects in the country, consideration of sustainability factors during planning, construction and operation phases of dam projects can create significant economical, social and environmental impacts in the long term. To come up with an inclusive sustainable development, new sustainability assessment approaches seek for sustainable development at the entire project’s life-cycle; they are looking for sustainable development at all design, construction, operation, maintenance and even demolition phases. In this research we have...
Experimental Measurement of Aerodynamic Characteristics of a Projectile at Subsonic and Supersonic Regims
, M.Sc. Thesis Sharif University of Technology ; Soltani, Mohammad Reza (Supervisor) ; Farahani, Mohammad (Supervisor)
Abstract
A projectile was tested in a wind tunnel at various free sream Mach numbers and angles of attack. The tests were carried out at the transonic wind tunnel of the Imam Hussein University.The experiments were performed at subsonic and supersonic speeds and at different angles of attack. The aerodynamic behavior of the model was investigated using force and moment measurements. The results showed that in the range of measured angles of attack the separation did not occurr and variations of lift coefficient remained linear for all Mach numbers except for a free stream Mach number of 2.0. For this Mach number, the asymmetric bow shock makes a pressure difference between leeward and windward sides,...
Oxidation of α-hydroxy ketones to diketones by iodic acid supported on alumina
, Article Journal of Chemical Research ; Issue 6 , 2006 , Pages 345- ; 03082342 (ISSN) ; Naeimi, H ; Shirazizadeh, F ; Karimi Jaberi, Z ; Sharif University of Technology
Scientific Reviews Ltd
2006
Abstract
Benzoins are rapidly oxidised to benzils in high yields by iodic acid supported on alumina under solvent-free conditions and microwave irradiation
A mild and efficient oxidation of benzylic alcohols without solvent using iodic acid supported on wet montmorillonite K10 or silica gel under microwave irradiation
, Article Acta Chimica Slovenica ; Volume 52, Issue 1 , 2005 , Pages 86-87 ; 13180207 (ISSN) ; Rahimi, A ; Karimi Jaberi, Z ; Ahmadibeni, Y ; Sharif University of Technology
2005
Abstract
Iodic acid supported on wet silica gel and K10 clay are used for the efficient oxidation of benzylic alcohols under microwave irradiation and solvent free condition
On the reduction of the number of required motions in the dynamic analysis using a refined spectral matching
, Article Earthquake and Structures ; Volume 21, Issue 4 , 2021 , Pages 425-444 ; 20927614 (ISSN) ; Mashayekhi, M ; Mohammadnezhad, H ; Jaberi, H ; Estekanchi, H. E ; Sharif University of Technology
Techno-Press
2021
Abstract
This study aims to show the efficiency of a proposed spectral matching technique for the reduction of required ground motions in the dynamic time history analysis. In this non-stationary spectral matching approach, unconstrained optimization is employed to adjust the signal to match a target spectrum. Adjustment factors of discrete wavelet transform (DWT) coefficients associated with the signals are then considered as decision variables and the Levenberg-Marquardt algorithm is employed to find the optimum values of DWT coefficients. This matching algorithm turns out to be quite effective in the spectral matching objective, where matching at multiple damping ratios can be readily achieved....
Solid state oxidation of phenols to quinones with sodium perborate on wet montmorillonite K10
, Article Journal of the Brazilian Chemical Society ; Volume 16, Issue 5 , 2005 , Pages 1082-1084 ; 01035053 (ISSN) ; Eftekhari Sis, B ; Khalili, B ; Karimi Jaberi, Z ; Sharif University of Technology
Sociedade Brasileira de Quimica
2005
Abstract
Phenols were oxidized to quinones using sodium perborate (SPB) on wet montmorillonite as oxidant. The reaction was carried out at ambient temperature on the solid phase under solvent free conditions. ©2005 Sociedade Brasileira de Química