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    Multidisciplinary optimisation of a car component under NVH and weight constraints using RSM

    , Article International Journal of Vehicle Noise and Vibration ; Volume 5, Issue 3 , 2009 , Pages 261-270 ; 14791471 (ISSN) Azadi, M ; Azadi, S ; Moradi, M ; Zahedi, F ; Sharif University of Technology
    2009
    Abstract
    One of the important challenges in the auto industry is to reduce the mass of the vehicle while meeting structural performance requirements for crashworthiness, noise, vibration and harshness, etc. In this paper, a multidisciplinary optimisation of a car back-bonnet is investigated by using the response surface method. A car body is fully surface modelled in CATIA and meshed in software. Then, modal analysis of the finite element model is performed by NASTRAN software to find natural frequencies. A frequency map of that component is extracted and compared with a reference map to detect defects. Design of experiments methodology is used for a screening of the design space and for the... 

    Design optimisation of aluminium recycling processes using Taguchi technique

    , Article Journal of Materials Processing Technology ; Volume 127, Issue 1 , 2002 , Pages 96-106 ; 09240136 (ISSN) Khoei, A. R ; Masters, I ; Gethin, D. T ; Sharif University of Technology
    2002
    Abstract
    In this paper, a robust design method is developed for reducing cost and improving quality in aluminium recycling. An experimental investigation into the process parameter effects is presented to determine the optimum configuration of design parameters for performance, quality and cost. The Taguchi method is applied initially to plan a minimum number of experiments. Orthogonal array techniques are used to investigate the simultaneous variation of several parameters and the investigation of interactions between parameters. Matrix experiments using standard L4 and L9 orthogonal arrays are employed to evaluate the effects of parameters in recycling of aluminium dross and scrap materials. A... 

    Application of disc screen for wastepaper recycling: evaluation of influential parameters

    , Article International Journal of Environmental Science and Technology ; Volume 19, Issue 6 , 2022 , Pages 4923-4930 ; 17351472 (ISSN) Rezaee, A ; Moussavi, G ; Feil, A ; Norouzzadeh, R ; Moradi, M ; Azami, K ; Keshavarz, K ; Sharif University of Technology
    Springer Science and Business Media Deutschland GmbH  2022
    Abstract
    Recycling of wastepaper is an effective way to achieve the sustainable paper manufacturing regarding sustainable development goals. Focusing on the mixed wastepaper sorting, recovery of suitable papers for deinking purpose and minimizing the impurities were developed in this study. In a wastepaper sorting process, each equipment has its own role in increasing recycling performance. In this study, disc screen was applied and evaluated for sorting of the mixed wastepaper considering independent variables such as inclination, velocity and moisture content. Response surface method was applied for design of the experiments. Sorting efficiency of 100% was achieved in two conditions: 1–20%... 

    Optimization of Xanthan Gum Separation

    , M.Sc. Thesis Sharif University of Technology Ranjbar Golafshani, Maedeh (Author) ; Alemzadeh, Iran (Supervisor) ; Maghsoudi, Vida (Co-Advisor)
    Abstract
    Xanthan is a water-soluble anionic polysaccharide that is produced by anaerobic fermentation using the bacterium Xanthomonas campstris. Xanthan is used in various industries, including food industry and oil industry because of its appropriate rheological properties. For this reason, various studies have been done on the production and recovery of xanthan. In this study conditions for recovery of xanthan gum were investigated and optimized by response surface methodology. Initially xanthan production under optimal conditions that determined in previous studies i.e. YM broth at 30 ⁰C without pH control was performed. After production, the gum separation was investigated using food solvents... 

    Biodesulfurization of Light Fuel Oil

    , M.Sc. Thesis Sharif University of Technology Najafi, Helya (Author) ; Farhadi, Fatollah (Supervisor) ; Molaei, Asghar (Supervisor) ; Arabeyan, Daruosh (Co-Advisor)
    Abstract
    Biological removal of sulfur compounds from petroleum is one of the major attractions of environmental technologies in the oil industry. Inefficient sulfur removal in refining processes causes sulfur oxides (SOx) production after combustion, which has adverse effects on the environment.Today the most common way to remove sulfur from crude oil is Hydrodesulfurization which has poor performance in removing some heterocyclic compounds such as thiophenes. Increase the amount of sulfur in the remaining oil reserves and the other hand, more stringent environmental regulations, has led researchers to development and invent new methods for desulfurization. Biological desulfurization is one of these... 

    Fabrication and Studies on the Mechanical Properties and Biodegradability of Nano-biocomposites Utilizable in Food Packaging

    , Ph.D. Dissertation Sharif University of Technology Heydari, Amir (Author) ; Vossoughi, Manouchehr (Supervisor) ; Alemzadeh, Iran (Co-Advisor)
    Abstract
    In this research, Response Surface Methodology was applied to study the effects of Na-Montmorillonite and glycerol on some functional properties of corn starch films. Films were prepared by casting method according to central composite design. No antimicrobial activities were observed against Escherichia coli and Staphylococcus aureus. The minimum of hydrophilicity and the maximum of tensile strength were obtained by maximization of clay and minimization of plasticizer in the considered range, which resulted in minimum transparency. Biodegradation of corn starch/glycerol/Na-MMT nanocomposites by soil burial according to ASTM D6400 and enzymatic degradation tests were carried out for up to 6... 

    Investigation of biotechnological production of Vitamin C

    , M.Sc. Thesis Sharif University of Technology Alizad Derakhshi Azar, Sepideh (Author) ; Alemzadeh, Iran (Supervisor)
    Abstract
    Vitamin C is an essential for the survival of human, animals and plants. Human and most animals can not produce vitamin C in their bodies, thus the need to produce vitamin C as a supplement is necessary. Nowadays, for the industrial production of vitamin C, two Chinese and Rychstyn methods are used, the first method is a two-step method which is accomplished biological and the second method is done chemically. In Chinese method, first step, which is the most important step is production of L-sorbose from D-sorbitol by Gluconobacter oxydans bacteria .Thus, in this study it was attempted to optimize the production of L-sorbose to be used in industrial production of L-ascorbic acid. In... 

    Removal of Heavy Methal Ions from Wastwater Via Novel Nanocomposite of Biochar/Tio2

    , M.Sc. Thesis Sharif University of Technology Anoosha, Ebrahim (Author) ; Farhadi, Fathollah (Supervisor)
    Abstract
    To investigate the metallic cation (Ni and Pb) removal performance of the rice barn-obtained biochar which was modified by nitric acid and titanium nanoparticles (TiO2) adsorption tests were conducted in continuous and non-continuous systems. First section addressed the characterization of the synthesized sorbents using field emission scanning electron microscope (FESEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), energy dispersive X ray spectroscopy (EDX) and sorption-desorption porosity analysis (BET). In the second section, the effect of different parameters such as pH, initial concentration of the metallic ions, temperature, time, sorbent content, ionic... 

    Experimental Study and Optimization of The Nano-Photocatalytic Degradation of Water Contaminants

    , M.Sc. Thesis Sharif University of Technology Attar, Farid (Author) ; Borghei, Mehdi (Supervisor) ; Feilizadeh, Mehrzad (Co-Supervisor)
    Abstract
    Photocatalytic degradation is one of the developing modern and effective methods for decontamination of hazardous pollutants of chemical industrial wastewater. In spite of great developments in this field of research and its various advantages, finding a process with high efficiency and optimization of the operating parameters are still required to be investigated. In this study, the photocatalytic degradation of 2-Nitrophenol under natural sunlight irradiation using industrial photocatalysts such as TiO2 (Hombikat), ZnO, WO3 and TiO2 (P25) was investigated. The photocatalysts were characterized by the XRD, BET, SEM and DRS tests and the effects of significant operating parameters (the... 

    Optimization of operating parameters and rate of uranium bioleaching from a low-grade ore

    , Article Journal of Radioanalytical and Nuclear Chemistry ; Vol. 301, issue. 2 , 2014 , pp. 341-350 ; ISSN: 02365731 Rashidi, A ; Roosta-Azad, R ; Safdari, S. J ; Sharif University of Technology
    Abstract
    In this study the bioleaching of a low-grade uranium ore containing 480 ppm uranium has been reported. The studies involved extraction of uranium using Acidithiobacillus ferrooxidans derived from the uranium mine samples. The maximum specific growth rate (μ max) and doubling time (t d) were obtained 0.08 h-1 and 8.66 h, respectively. Parameters such as Fe2+ concentration, particle size, temperature and pH were optimized. The effect of pulp density (PD) was also studied. Maximum uranium bio-dissolution of 100 ± 5 % was achieved under the conditions of pH 2.0, 5 % PD and 35 °C in 48 h with the particles of d 80 = 100 μm. The optimum concentration of supplementary Fe2+ was dependent to the PD.... 

    Optimization of a mcpherson suspension system using the design of experiments method

    , Article SAE Automotive Dynamics, Stability and Controls Conference and Exhibition, Novi, MI, 14 February 2006 through 16 February 2006 ; 2006 ; 01487191 (ISSN) Eskandari, A ; Mirzadeh, O ; Azadi, S ; Sharif University of Technology
    SAE International  2006
    Abstract
    In this research, the handling behavior of an intermediate class passenger car has been optimized by altering its front suspension parameters. For this purpose, a validated virtual model of the car, constructed by Adams/Car software, has been used. The utilized objective function is a combination of eight criteria indicating handling characteristics of the car. To reduce the amount of optimization parameters, a sensitivity analysis has been done by implementing the Design of Experiments method capabilities. Optimization has been done using the Response Surface Method. The obtained optimization results show a considerable improvement in the system response. Copyright © 2006 SAE International  

    Application of disc screen for wastepaper recycling: evaluation of influential parameters

    , Article International Journal of Environmental Science and Technology ; 2021 ; 17351472 (ISSN) Rezaee, A ; Moussavi, G ; Feil, A ; Norouzzadeh, R ; Moradi, M ; Azami, K ; Keshavarz, K ; Sharif University of Technology
    Springer Science and Business Media Deutschland GmbH  2021
    Abstract
    Recycling of wastepaper is an effective way to achieve the sustainable paper manufacturing regarding sustainable development goals. Focusing on the mixed wastepaper sorting, recovery of suitable papers for deinking purpose and minimizing the impurities were developed in this study. In a wastepaper sorting process, each equipment has its own role in increasing recycling performance. In this study, disc screen was applied and evaluated for sorting of the mixed wastepaper considering independent variables such as inclination, velocity and moisture content. Response surface method was applied for design of the experiments. Sorting efficiency of 100% was achieved in two conditions: 1–20%... 

    Investigating the Permeability and Mechanical Properties of Horizontal Joints in Roller Compacted Concrete Dams

    , M.Sc. Thesis Sharif University of Technology Aziz Mohammadi, Morteza (Author) ; Ghaemian, Mohsen (Supervisor) ; Toufigh, Vahab (Supervisor)
    Abstract
    Roller compacted concrete is a dry concrete with zero slump which is constructed in layers. Roller compacted concrete dams are generally weak in interlayers. The bonding strength and permeability of the interlayer affect the performance of the dam’s structure and its safety. In this study, the mechanical characteristics and the permeability of the interface layer of RCC are investigated by considering three key parameters, including water-to-cement ratio (w/c) of concrete, w/c ratio of bedding mortar and time interval between pouring each layer. More than 300 RCC specimens are prepared. To evaluate the properties of the interface between the mortar and the first layer surface, various tests... 

    Feasibility Study on the Production of Biodiesel Using Domestic Wastes

    , M.Sc. Thesis Sharif University of Technology Atapour, Mehdi (Author) ; Kariminia, Hamid Reza (Supervisor) ; Moslehi, Parivash (Supervisor)
    Abstract
    Biodiesel as an alternative fuel for fossil diesel has many benefits such as reducing regulated air pollutants emissions, reducing greenhouse gases emissions, being renewable, biodegradable and non-toxic. In this study, used frying oil was used as a low cost feedstock for biodiesel production by alkali-catalyzed transesterification. The used frying oil was originally a mixture of various oils obtained from vegetables that are native to Iran. The design of experiments was performed using a 5-level-5-factor central composite design coupled with response surface methodology in order to study the effect of factors on the yield of biodiesel and optimizing the reaction conditions. The factors... 

    Preparation and Characterization of Asymmetric and Thin Film Composite Nanofiltration Membranes for Water Softening

    , M.Sc. Thesis Sharif University of Technology Mokhtari Garekani, Rasoul (Author) ; Mousavi, Abbas (Supervisor) ; Roosta Azad, Reza (Supervisor)
    Abstract
    In this study three type of nanofiltration membranes were prepared from PVC for water softening; (i) asymmetric PVC nanofiltration membrane, and two different thin film composite (TFC) membranes: (ii) polyamide (PA)/PVC composite membrane (iii) poly vinyl alcohol (PVA)/PVC composite membrane. Asymmetric nanofiltration membranes were prepared by phase inversion. The effect of PVC concentration, solvent (THF) and additive (PVP) on morphology and performance were studied by scanning electron microscopy (SEM) and measuring pure water flux and salt rejection. Increasing PVC concentration decreased pure water flux and increased salt rejection. Adding tetrahydrofuran(THF) decreased the pure water... 

    Producing Biodiesel from Waste Frying Oil Using Whole Cell Biocatalysts

    , M.Sc. Thesis Sharif University of Technology Ghaderinezhad, Fariba (Author) ; Yaghmaei, Soheyla (Supervisor) ; Kariminia, Hamid Reza (Supervisor)
    Abstract
    Nowadays, due to depletion of fossil fuels and the emission of green house gases, biodiesel has attracted lots of attention as a renewable, non-toxic, and biodegradable fuel. Biodiesel can be produced from different resources such as vegetable oil, animal fat and algae oil. In this study, waste frying oil was used as a raw material that can reduce the probable hazardous effects of its disposal and produce a clean fuel at the same. Biofuel was produced through an enzymatic method using the whole cell of Rizopu oryzae (a filamentous fungus) in both immobilized and free forms. In order to find the optimum conditions for biodiesel production, four variables including temperature, methanol to oil... 

    Study and Improvement of Nano-photocatalytic Process Fordegradation of Chemical Contaminants

    , M.Sc. Thesis Sharif University of Technology Moradi, Sina (Author) ; Rashtchian, Davood (Supervisor) ; Vosoughi, Manouchehr (Supervisor)
    Abstract
    In this thesis, photocatalytic oxidation as a potential method for the treatment of organic environmental contaminants is deeply investigated. While the photocatalytic degradation of various organic compounds under UV light irradiation has been widely investigated, visible-light-induced photocatalytic degradation of low-levels of the pollutants such as Dibenzothiophene (DBT) and 2-Nitrophenol (2-NP) are occasionally reported. In the present work, Lanthanide / Polyethylene glycol -modified TiO2 (La/PEG/TiO2) and Fe,Cu,S/TiO2 have been successfully synthesized by a sol–gel method. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission... 

    Kinetic Evaluations, Economical and Scale-up Studies of the Co-Mo/Ɣ-Al2O3Catalyst for Hydrodesulfurization (HDS) Process

    , M.Sc. Thesis Sharif University of Technology Oghabi Sajjadi, Mohammad Hossein (Author) ; Kazemeini, Mohammad (Supervisor) ; Khorashe, Farhad (Supervisor)
    Abstract
    Sulfur compounds are very undesirable and result in Corrosion in metal equipment, air pollutions and poisoning of refinery Catalysts such as reforming Catalyst. Therefore, application of Hydrodesulfurization (HDS) process in order to decrease the amount of sulfur in petroleum cuts has a great importance. HDS process is the most usual and efficientmethod for sulfur removal. In this method sulfur compounds at vigorous operating conditions such as high temperature and pressure in the presence of catalyst react with hydrogen and produce hydrogen disulfide and hydrocarbon. Sulfided Co–Mo catalysts are widely used in this process.
    The aim of this study is to prepare and improve CoMo/γ-Al2O3... 

    Experimental Study and Prediction of Vancomycin Partitioningin Surfactant-Salt Aqueous Two-Phase Systems

    , M.Sc. Thesis Sharif University of Technology Shirvani, Sara (Author) ; Vosughi, Manouchehr (Supervisor) ; Rashtchian, Davood (Supervisor) ; Pazuki, Gholamreza (Supervisor)
    Abstract
    In the past years, upstream processes have been receiving a considerable R&D investment and commercial attention. The downstream processes have, however, been overlooked causing a production bottleneck that is shifting the costs of production from up to downstream. The need to develop more efficient and cost-effective separation and purification processes is, thus, crucial in order to improve process efficiency and economics keeping the required high standards of quality for market approval. In this research, promising aqueous two-phase systems (ATPS) containing Tween 20 as a quite biocompatible non-ionic surfactant and different salts (K3Citrate and NaH2PO4) were prepared and their... 

    Investigation of the Addendum Geometry Effects on the Mechanical Properties Part in Sheet Metal Forming

    , M.Sc. Thesis Sharif University of Technology Ahmadi Darsikolaei, Kasra (Author) ; Assempour, Ahmad (Supervisor)
    Abstract
    Many parameters affect the process quality and component properties in the sheet metal forming. In this study, the use of addendum geometry and initial blanks as effective parameters in improving the quality of the manufactured workpiece. So the purpose of this study was to investigate the effects of addendm geometry on end-product quality using inverse finite element method are based on unfolding technique, Artificial Neural Network and response surface method. The design variables include thickness strains in the center and wall of the workpiece, in contrast the initial blanks estimation and the addendum geometry effects, which include length and radius flange, are considered as output...