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naseiri-sarvi--masuod
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Design and Analysis of Nano Ball Bearing
, M.Sc. Thesis Sharif University of Technology ; Ahmadian, Mohammad Taghi (Supervisor)
Abstract
Nowadays, science of nano technology has been growing quickly in the past decade. Scientists implemented this technology in bioengineering, electronics and medicine extensively. Nano scale engineering is one of the interests of researchers, nano bearing as a nano scale structure and as an important part of nano machining plays an important role in micro and nano devices. The role of nano bearing is to decrease energy dissipation and increase the efficiency of nano machines. The main purpose of this study is to design and analyze an optimized nano ball bearing. In this regard, a new spherical super element is designed and presented. This super element is implemented in simulating the...
Pragmatic Semantics
, M.Sc. Thesis Sharif University of Technology ; Izadi, Mohammad (Supervisor)
Abstract
Three distinct areas in linguistic studies are typically considered, namely, syntax, semantics and pragmatics. Each category has a specific realm and deals with special linguistic phenomena. Presenting exact definition and clarification of the corresponding boundaries of each area is considered in both linguistics and philosophy of language. In order to explain the “meaning” for sentences of a language, this issue turns out to be vital. Representing the definition and evaluating the domain of each area, is the objective of the first chapter. In chapter two, some important semantic theories have been investigated. Since at first one semantic theory ought to clear its position about reference,...
Adhesion and Viscoelestisity of EVA Hot Melt Adhesive
, M.Sc. Thesis Sharif University of Technology ; Frounchi, Masuod (Supervisor) ; Dadbin, Susan (Supervisor)
Abstract
A series of poly(ethylene-co-vinyl acetate) (EVA)-based hot melt adhesives containing either a raw rosin or a hydrogenated rosin ester have been prepared to investigate variation of viscosity, softening point and peel adhesion with composition. Adhesion of the prepared hot melt adhesive to the substrate was characterized by T-peel strength test. Increasing rosin had a prominent effect on the adhesion. Viscosity decreased and softening point increased as the wax content increased. Addition of zinc borate as a flame retardant decreased T-peel energy and increased the viscosity and softening point of the samples. Higher peeling strength accompanied with a good softening point and viscosity...
Design and implementation of a new spherical super element in structural analysis
, Article Applied Mathematics and Computation ; Volume 218, Issue 14 , March , 2012 , Pages 7546-7561 ; 00963003 (ISSN) ; Ahmadian, M. T ; Sharif University of Technology
2012
Abstract
Finite Element Method (FEM) has proved to be a powerful tool for the analysis of mechanical problems such as finding natural frequency and deformation of structures. Design and implementation of super elements with a purpose in reduction of computational time along with accuracy is one of the challenges facing engineers in the past decade. In this study a newly spherical super element is designed and implemented to some problems. This element is generated in such a way that the user can select as many numbers of nodes as desired. Proper formulation is presented to generate the shape function for each node in this element. Some examples of static and vibration analysis using this element are...
Static and vibrational analysis of fullerene using a newly designed spherical super element
, Article Scientia Iranica ; Volume 19, Issue 5 , 2012 , Pages 1316-1323 ; 10263098 (ISSN) ; Ahmadian, M. T ; Sharif University of Technology
2012
Abstract
Accurate prediction of static and dynamic response of nano structures under external excitations has been one of the interests of scientists in the last decade. Several applications of nano machines make it necessary to analyze their components, such as nano bearing, precisely. In this paper, the static and vibrational behavior of a fullerene as a sensitive part of nano bearing under external forces is simulated by a newly designed spherical super element. This super element is designed in such a way that the user can select as many numbers of nodes as desired, so that it can be implemented in different desired precisions. In this study, a 228-node super element, which is similar to a hollow...
Deformation, stress and natural frequency analysis of the fullerene by finite super element method
, Article Proceedings of the ASME Design Engineering Technical Conference, 28 August 2011 through 31 August 2011 ; Volume 7 , August , 2011 , Pages 153-158 ; 9780791854846 (ISBN) ; Ahmadian, M. T ; Sharif University of Technology
2011
Abstract
Accurate prediction of static and dynamic response of nano structures is one of the important interests of scientists in the last decade. Nano bearing as an important part of nano machines has been extensively implemented in recognizing and disassembling cancerous cells and building molecular support structures for strengthening bones. For this reason, Molecular Dynamic Method and some experimental methods are implemented in this area. As nano ball bearing is one of the most important components of nano machines, a large number of studies are concentrated to analyze it statically and dynamically. In this paper, a Fullerene is simulated by a spherical super element whose stress, deformation...
Application of a new spherical super element in predicting the deformation of biological cells in microinjection
, Article Proceedings of the ASME Design Engineering Technical Conference, 28 August 2011 through 31 August 2011 ; Volume 7 , August , 2011 , Pages 41-49 ; 9780791854846 (ISBN) ; Ahmadian, M. T ; Sharif University of Technology
2011
Abstract
Biological cell injection is a sensitive and important work which is implemented in injection of foreign materials into individual cells. Microinjection is significantly developed in the field of drug discovery and genetics so predicting the behavior of cell in microinjection is remarkably important because a tiny excessive manipulation force can destroy the tissue of the biological cell. There are a few analytical methods available to simulate the cell injection, hence the numerical methods such as FEM are suitable to be used to model the microinjection. In this study, a new spherical super element is presented to model the biological cells and deformation of a specific cell under an...
Comparison of deformation analysis of a biological cell under an injection force using analytical, experimental and finite element methods and Artificial Neural Network
, Article ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 ; Volume 2 , 2011 , Pages 499-507 ; 9780791854884 (ISBN) ; Ahmadian, M. T ; ASME ; Sharif University of Technology
2011
Abstract
Biological cell injection is a sensitive and important work which is implemented in injection of foreign materials into individual cells. Microinjection is significantly developed in the field of drug discovery and genetics so predicting the behavior of cell in microinjection is remarkably important because a tiny excessive manipulation force can destroy the tissue of the biological cell. There are a few analytical methods available to simulate the cell injection, hence the numerical methods such as FEM are suitable to be used to model the microinjection. In this study, a new spherical super element is presented to model the biological cells and deformation of a specific cell under an...
Synthesis and characterization of bagasse poly(methyl methacrylate) graft copolymer
, Article Macromolecular Symposia ; Volume 274, Issue 1 , 2008 , Pages 49-54 ; 10221360 (ISSN) ; Pourjavadi, A ; Noei Aghaei, M. A ; Sharif University of Technology
2008
Abstract
Graft copolymerization of methyl methacrylate (MMA) was carried out on bagasse fibers in an aqueous medium using eerie ammonium nitrate (CAN) as initiator under a neutral atmosphere. In order to obtain the optimum condition for graft copolymerization, the effects of initiator concentration, temperature, time of reaction, and monomer concentration were studied. The maximum grafting percent was found to be 122%. The bagasse grafted poly(methyl methacrylate) was characterized by FTIR and its thermal behavior was characterized by TGA. Copyright © 2008 WILEY-VCH Verlag GmbH & Co. KGaA
Deformation and stress analysis of the fullerene by super element
, Article ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 ; Volume 2 , 2011 , Pages 895-900 ; 9780791854884 (ISBN) ; Ahmadian, M. T ; Barari, A ; ASME ; Sharif University of Technology
2011
Abstract
Accurate prediction of static and dynamic response of nano structures is one of the important interests of scientists in the last decade. Nano bearing as an important part of nano machines has been extensively implemented in recognizing and disassembling cancerous cells and building molecular support structures for strengthening bones. For this reason, Molecular Dynamic Method and some experimental methods are implemented in this area. As nano ball bearing is one of the most important components of nano machines, a large number of studies are concentrated to analyze it statically and dynamically. In this paper, a Fullerene is simulated by a spherical super element whose stress, deformation...
Deflection and vibration analysis of a spherical structure using a newly designed spherical super element
, Article ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), 12 November 2010 through 18 November 2010, Vancouver, BC ; Volume 9 , 2010 , Pages 249-256 ; 9780791844465 (ISBN) ; Nasiri Sarvi, M ; Nasiripour, A. A ; Sharif University of Technology
2010
Abstract
The Finite Element Methods (FEM) are important numerical techniques for analysis of physical problems. Quick prediction of dynamic and static response of structures is one of the interests of both industry and scientists. One of the key elements to achieve this goal is 3D super element compatible with regular geometrical configuration by which a series of structures can be analyzed with less time and higher accuracy. In this paper, a newly designed spherical super element is presented. In this super element, the user can enjoy as many numbers of nodes as he wishes and consequently reaches thedesired accuracy and consuming computational time. It can also be used to analyze structures from...
Thermodynamic Modeling of CO2 Gas Adsorption on Zeolite 4A
, M.Sc. Thesis Sharif University of Technology ; Ghotbi, Cyrus (Supervisor) ; Taghikhani, Vahid (Co-Advisor)
Abstract
This project simulates the absorption of carbon dioxide absorbent on 4A zeolite is carried out using Monte Carlo simulation. VBA is a programming language and software used. Grand Canonical simulations performed on a set of particles (Grand Canonical) intended to present new algorithms and computational simulations are presented. Density fluctuations in the algorithms used and the smallest value of less than 0.2 is considered. In the new method of modeling, simulation node cell packing and moving is done on a given node. Adsorption density results obtained from the simulation carried out shows that the adsorption process is the logical and reasonable. Also, the part of the validation of the...
A robust machine learning structure for driving events recognition using smartphone motion sensors
, Article Journal of Intelligent Transportation Systems: Technology, Planning, and Operations ; 2022 ; 15472450 (ISSN) ; Taheri Sarteshnizi, I ; Samimi, A ; Sarvi, M ; Sharif University of Technology
Taylor and Francis Ltd
2022
Abstract
Driving behavior monitoring by smartphone sensors is one of the most investigated approaches to ameliorate road safety. Various methods are adopted in the literature; however, to the best of our knowledge, their robustness to the prediction of new unseen data from different drivers and road conditions is not explored. In this paper, a two-phase Machine Learning (ML) method with taking advantage of high-pass, low-pass, and wavelet filters is developed to detect driving brakes and turns. In the first phase, accelerometer and gyroscope filtered time series are fed into Random Forest and Artificial Neural Network classifiers, and the suspicious intervals are extracted by a high recall. Following...
Mental arousal level recognition competition on the shared database
, Article 27th Iranian Conference on Electrical Engineering, ICEE 2019, 30 April 2019 through 2 May 2019 ; 2019 , Pages 1730-1736 ; 9781728115085 (ISBN) ; Rezania, S ; Khazaei, E ; Taghibeyglou, B ; Hashemi, S. S ; Kaveh, R ; Abootalebi, V ; Bagheri, S ; Homayounfar, M ; Asadi, M ; Mohammadian, A ; Mozafari, M ; Hasanzadeh, N ; DIni, H ; Sarvi, H. M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
This paper presents the results of the shared task with the aim of arousal level recognition for the competition held in conjunction with the 27th Iranian Conference on Electrical Engineering (ICEE 2019). A database annotated with arousal level labels released by Research Center for Development of Advanced Technologies. The contest was held on arousal database according to a defined protocol. Three teams were able to enter into the final stage of the competition according to compare their performance measure with the baseline method. The baseline method is proposed by the data owner. The aim of this paper is outlining the database, protocol design, and providing an overview of top-ranked...