Investigating and Analyzing the Use of Renewable Energies to Reduce Environmental Pollution with an Emphasis on the Automotive Industry

, M.Sc. Thesis Sharif University of Technology Gomari, Negin (Author) ; Mostafavi, Mostafa (Supervisor)

Abstract

Today, different cities in the world have hurried to consumers, natural resources, and producers of waste. Our cities are not excluded from this rule, especially metropolitan like Tehran, which accounted for only 12% of the country's land area, accounting for 15% of the volume of airborne contamination in the country. Considering the importance of the environmental pollution issue and the many researches done in this field, the present study attempts to investigate and analyze the application of renewable energy to reduce environmental pollution with an emphasis on the automotive industry. This is an applied research in terms of purpose. These types of researches are applicable because these...

A rapid prototyping-based methodology for patient-specific contouring of osteotomy plates

, Article Rapid Prototyping Journal ; Volume 25, Issue 5 , 2019 , Pages 888-894 ; 13552546 (ISSN) Gomari, B ; Farahmand, F ; Farkhondeh, H ; Sharif University of Technology

Emerald Group Publishing Ltd 2019

Abstract

Purpose: An important challenge of the osteotomy procedures, particularly in the case of large and complex corrections, is the fixation of the osteotomy site. The purpose of this study is to propose a practical and cost-effect methodology for the plate adapting problem of osteotomy surgery. Design/methodology/approach: A novel patient-specific plate contouring methodology, based on rapid prototyping (RP) and multi-point forming (MPF) techniques, was developed and evaluated. In this methodology, a female mold is fabricated by RP, based on the geometry of the osteotomy site and estimation of the plate spring back. The mold is then used to configure a MPF die, which is then used for press...

Refining of Nanostructure of Polypropylene/Nanoclay Composite Via Optimization of Compatibilizer and Masterbatch

, M.Sc. Thesis Sharif University of Technology Jalili, Negin Sadat (Author) ; 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...

Analysis, Design and Manufacturing of Custom Osteotomy Implants Forming Machine

, M.Sc. Thesis Sharif University of Technology Gomari, Behnam (Author) ; Farahmand, Farzam (Supervisor) ; Farkhondeh, Hassan (Supervisor)

Abstract

Knee arthritis is a painful disease from which millions of people around the world are suffering. One of the main causes of osteoarthritis and joint damage that starts from a young age, is that bones around the knee are not in a straight line. As a result, this situation causes additional pressure to the knee. This should be corrected with surgery. There are two procedures for this operation, a conventional method and a customized method. In conventional method, surgical planning is based on 2d X-ray images and plates are formed and fixed approximately at the desired location. This method is not precise enough and may cause problems for the patient. A new developing method, is that all the...

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) Mohammadi Boghaee, D ; 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) Boghaee, D. M ; 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) Boghaee, D. M ; 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...

Facilitating Data Exchange Between Streaming Processors in GPUs

, Ph.D. Dissertation Sharif University of Technology Nematollahizadeh Mahani, Negin Sadat (Author) ; 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...