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Modeling and Control of Polyethylene Terephthalate Production Reactor
, M.Sc. Thesis Sharif University of Technology ; Shahrokhi, Mohammad (Supervisor)
Abstract
Polyethylene terephthalate (PET) is known as the most important polyester in the world. This polymer is the raw material for synthetic fibers, films and plastic objects and widely used in textiles and food industry. In this project transesterification and polycondensation reactors of a semi-batch process with dimethyl terephthalate/ethylene glycol feedare simulated. First simulations areperformed for reactors in the laboratory scale.Then the reactors are scaled up to industrial scale in order to produce 100 tons per year of PET product. The optimal temperature trajectory for the fisrt reactor is obtained based on a performance index. This performance index includes the reaction time and...
Refining of Nanostructure of Polypropylene/Nanoclay Composite Via Optimization of Compatibilizer and Masterbatch
, M.Sc. Thesis Sharif University of Technology ; Bagheri, Reza (Supervisor)
Abstract
Polypropylene (PP) is a fast growing polymer, particularly in automotive industry, where PP compounds have replaced many different parts made of conventional materials. In the first step, PP-g-MA, as compatibilizer, was synthesized. Two kinds of polypropylenes including a homo- and a block co-polymer were incorporated for this goal. Characterizations via titration and FTIR tests revealed higher degree of grafting reaction when homo-polymer was used for synthesizing PP-g-MA. In the next step, nanocomposites containing 3 wt% nanoclay with three different PP-g-MA/nanoclay ratios of 1:1, 2:1 and 3:1were made using a co-rotating twin screw extruder. Tensile, impact and XRD tests were performed to...
Oxidative coupling of methane on BaTiO3 perovskites partially substituted with germanium
, Article 2008 AIChE Spring National Meeting, Conference, New Orleans, LA, 6 April 2008 through 10 April 2008 ; 2008 ; 9780816910236 (ISBN) ; Hamidzadeh, M ; Negin, S ; Sharif University of Technology
2008
Abstract
The perovskite oxide BaTiO3, doped with Ge oxides oxidized methane to C2 coupled hydrocarbons. The ultraviolet-visible spectra of pure barium titanate and Ge doped BaTi(1-x) GexO3 (x=0.05 ,0.1) were compared. The pure barium titanate exhibited an ultraviolet absorption effect. The addition of GeO2 resulted in an increase in absorption of wavelength. Therefore, small amount of Ge decreased band gap energy. Oxygen is inserted by nucleophilic attack which may be considered as an acid-base process. For promoted BaTiO3 catalysts with stable cation valance, electron donation ability of lattice oxygen is parallels to its ability of adsorb and active oxygen, and decrease the chance of deep oxidation...
Oxidative coupling of methane on BaTiO3 perovskites partially substituted with germanium
, Article 2008 AIChE Spring National Meeting, Conference, New Orleans, LA, 6 April 2008 through 10 April 2008 ; 2008 ; 9780816910236 (ISBN); 9780816910236 (ISBN) ; Hamidzadeh, M ; Negin, S ; Sharif University of Technology
2008
Abstract
The perovskite oxide BaTiO3, doped with Ge oxides oxidized methane to C2 coupled hydrocarbons. The pure barium titanate exhibited an ultraviolet absorption effect. The addition of GeO2 resulted in an increase in absorption of wavelength. Small amount of Ge decreased band gap energy. For promoted BaTiO3 catalysts with stable cation valance, electron donation ability of lattice oxygen was parallel to its ability of adsorb and active oxygen, and decreased the chance of deep oxidation of methyl radicals and C2 hydrocarbons and thus will result in an increase of C2 yield. This is an abstract of a paper presented at the 42nd Loss Prevention Symposium (New Orleans, LA 4/6-10/2008)
Oxidative coupling of methane on BaTiO3 perovskites partially substituted with germanium
, Article Catalysis and Reaction Engineering Division Conference, Presentations at the 2008 AIChE Spring National Meeting, 6 April 2008 through 10 April 2008 ; 2008 , Pages 89-94 ; 9781605602233 (ISBN) ; Hamidzadeh, M ; Negin, S ; Sharif University of Technology
AIChE
2008
Abstract
The perovskite oxide BaTiO3, doped with Ge oxides oxidized methane to C2 coupled hydrocarbons. The ultraviolet-visible spectra of pure barium titanate and Ge doped BaTi(1-x)GexO3(x=0.05,0.1) were compared. The pure barium titanate exhibited an ultraviolet absorption effect. The addition of GeO2 resulted in an increase in absorption of wavelength. Therefore, small amount of Ge decreased band gap energy. Oxygen is inserted by nucleophilic attack which may be considered as an acid-base process. For promoted BaTiO3catalysts with stable cation valance, electron donation ability of lattice oxygen is parallels to its ability of adsorb and active oxygen, and decrease the chance of deep oxidation of...
Heat induction of iron oxide nanoparticles with rational artificial neural network design-based particle swarm optimization for magnetic cancer hyperthermia
, Article Materials Research Bulletin ; Volume 157 , 2023 ; 00255408 (ISSN) ; Ramazani Saadatabadi, A ; Shirgahi, H ; Mozafari, M. R ; Sharif University of Technology
Elsevier Ltd
2023
Abstract
This study presented the optimization of synthesis experimental conditions by examining the simultaneous effects of synthesis environment and precipitating agent type on the physiochemical, morphological, and magnetization characteristics of Fe3O4 nanoparticles (FeNPs). The experimental results implied that the effect of the synthesis environment outweighed that of the precipitating agent by enhancing the crystallinity and magnetization of FeNPs with smaller particle sizes. The hyperthermic performance of the optimal FeNPs was evaluated at different concentrations and different alternating magnetic fields (AMF). The promising candidate was 4 mg.mL−1 of FeNPs under the AMF exposure of 15...
Facilitating Data Exchange Between Streaming Processors in GPUs
, Ph.D. Dissertation Sharif University of Technology ; Sadrbazi Azad, Hamid (Supervisor)
Abstract
GPUs are used today to accelerate a wide range of general-purpose applications (e.g., regular stencil applications and irregular graph processing applications). Due to the significant growth of the Thread Level Parallelism (TLP) in GPGPU applications, the need for data sharing between different threads has become more apparent. There are a variety of solutions for reusing data in the GPU (e.g., on-chip caches and shuffle instructions), each with its own drawbacks and reduced comprehensiveness (e.g., limiting shared memory to a thread block and shuffle instructions to a warp). Among the standard general-purpose applications, L1 data cache is a major GPU solution for reusing data among...
Synthesis, characterization and in vitro analysis of superparamagnetic iron oxide nanoparticles for targeted hyperthermia therapy
, Article Chemical Papers ; 2020 ; Dabbagh, A ; Abnisa, F ; Karimian, H ; Abu Kasim, N. H ; Wan Daud, W. M. A ; Sharif University of Technology
Springer
2020
Abstract
Abstract: Superparamagnetic iron oxide nanoparticles (SPIONs) are considered as promising magnetic nanoheating agents for diagnostic as well as therapeutic applications due to their biocompatibility and tunability of magnetic properties. These nanoheating agents are commonly synthesized by coprecipitation of two iron precursors, though applying less amount of these chemicals may minimize the toxicity risks for biomedical purposes. The aim of this study is to address this issue by considering the high oxidation vulnerability of ferrous ions to ferric ions to synthesize SPIONs via a single-iron precursor under four varied oxidative conditions. The obtained results implied that the properties...
Synthesis, characterization and in vitro analysis of superparamagnetic iron oxide nanoparticles for targeted hyperthermia therapy
, Article Chemical Papers ; Volume 75, Issue 2 , 2021 , Pages 669-679 ; 03666352 (ISSN) ; Dabbagh, A ; Abnisa, F ; Karimian, H ; Abu Kasim, N. H ; Wan Daud, W. M. A ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2021
Abstract
Abstract: Superparamagnetic iron oxide nanoparticles (SPIONs) are considered as promising magnetic nanoheating agents for diagnostic as well as therapeutic applications due to their biocompatibility and tunability of magnetic properties. These nanoheating agents are commonly synthesized by coprecipitation of two iron precursors, though applying less amount of these chemicals may minimize the toxicity risks for biomedical purposes. The aim of this study is to address this issue by considering the high oxidation vulnerability of ferrous ions to ferric ions to synthesize SPIONs via a single-iron precursor under four varied oxidative conditions. The obtained results implied that the properties...