Design and Construction of Alginate-Silica Nanocomposite and Its Application for Mammalian Cell Culture

, M.Sc. Thesis Sharif University of Technology Mohammadi Fard, Hossein (Author) ; Vossughi, Manouchehr (Supervisor) ; Arpanaei, Ayyoob (Supervisor) ; Kabir Salmani, Maryam (Co-Advisor)

Abstract

Three sizes of silica nanoparticles (160±7, 450±10 and 600±25) were sythetized via template-removing method. The synthetized nanoparticles were functionalized with N-(2-aminoethyl)-3-aminopropyl trimethoxy-silane (EDS) to provide a positive charge on the surface of nanoparticles. BET analysis showed that the average pore diameter, surface area and pore volume of nanoparticles were 2.3 nm, 769 m2.g-1 and 0.44 cm3.g-1, respectively. showed that the Amine-functionalized silica nanoparticles were used to enhance the application of alginate polymer for 3D encapsulation of mammalian cells. Incorporating of silica nanoparticles can be suitable for the bead integrity and attachement of mammalian...

Experimental Investigation of CO2-Oil Relative Permeability

, M.Sc. Thesis Sharif University of Technology Ghoodjani, Eshragh (Author) ; Vossughi, Manouchehr (Supervisor) ; Shadizadeh, Reza (Supervisor) ; Kharrat, Reyaz (Supervisor) ; Ghazanfari, Mohammad Hossain (Co-Advisor)

Abstract

Relative permeability is an important factor that controls the two phase fluid flow in porous media. The use of carbon dioxide in enhanced oil recovery methods is common. But the question is, how does the carbon dioxide affect the relative permeability curves? In this thesis, the CO2-oil relative permeability is measured in CO2 flooding process with unsteady state method. For this purpose, the core flooding apparatus is used and the results are compared with N2-oil relative permeability in N2 flooding. The results of comparison show that oil relative permeability in CO2 flooding is higher than N2 flooding. Reduction of Interfacial tension and oil viscosity, solubility of CO2 in oil and oil...

In-situ Pb2+ remediation using nano iron particles

, Article Journal of Environmental Health Science and Engineering ; Volume 13, Issue 1 , 2015 ; 2052336X (ISSN) Fadaei Tehrani, M. R ; Shamsai, A ; Vossughi, M ; Sharif University of Technology

BioMed Central Ltd 2015

Abstract

Originally, application of nano zero valent iron (nZVI) particles for the removal of lead (Pb2+) in porous media was studied. At first, stabilized nZVI (S-nZVI) was prepared and characterized, then used in batch and continuous systems. Based on the batch experiments, corresponding reaction kinetics well fitted with the pseudo-first-order adsorption model, and reaction rate ranged from 0.01 to 0.04 g/mg/min depend on solution pH and the molar ratio between Fe and Pb. In batch tests, optimal condition with more than 90% removal efficiency at 60 min was observed at a pH range of 4 to 6 and Fe/Pb ratio more than 2.5. Continuous experiments exposed that Pb2+ remediation was as well influenced by...

Estimation of human lower extremity musculoskeletal conditions during backpack load carrying

, Article Scientia Iranica ; Volume 16, Issue 5 B , 2009 , Pages 451-462 ; 10263098 (ISSN) Selk Ghafari, A ; Meghdari, A ; Vossughi, G. R ; Sharif University of Technology

2009

Abstract

This paper focuses on the biomechanical aspects of the human lower extremity loading condition during backpack load carrying. A biomechanical framework was generated with the aim of employing a block-oriented structure of Simulink integrated with the Virtual Reality Toolbox of MATLAB software to provide a simulation study of the musculoskeletal system in a virtual environment. In this case, a ten-degrees-of-freedom musculoskeletal model actuated with sixteen muscles in each leg was utilized to simulate movement in the sagittal plane. An inverse dynamics based optimization approach was employed to estimate the excitation level of the muscles. In addition, distributions of the mechanical power...

Dynamics Modeling of new Scratch-drive Actuators with Bounce back Mechanism (BSDA)

, M.Sc. Thesis Sharif University of Technology Attarzadeh, Mohammad Ali (Author) ; Vossughi, Gholamreza (Supervisor) ; Meghdari, Ali (Supervisor)

Abstract

In recent decades, micro-electromechanical systems – MEMS – havefound extensive applications in applied science and engineering. One of the most popular MEMS actuatorsis micro Scratch Drive Actuator (SDA), which can be used in various applications, for instance: precision positioning, micro-chip displacement and rotating micromotors. Their outstanding capabilities such as: high controllability, precise step displacement, vast transportation domain and large force relative to their small size, have made them popular among researchers. Recently, a new generation of SDA is introduced, known as Bounce-back Scratch Drive Actuator or BSDA, which is fundamentally different in motion generation from...

Mechanisms of Conjugated Linoleic acid and Enriched Glycerides Production as Neutraceuticals Food

, Ph.D. Dissertation Sharif University of Technology Kouchak Yazdi, Zahra (Author) ; Alemzadeh, Iran (Supervisor) ; Vossughi, Manochehr (Co-Advisor)

Abstract

Dietary CLA production for medicinal purposes needs a safe and selective process. Biological production methods meet this goal. In this study, the microbial species that was suitable for CLA production was selected; then the CLA produced by bioconversion methods was utilized to produce CLA-enriched triglycerides by trans-esterification. Also the biochemical kinetics of CLA production and esterification reactions to produce CLA-enriched triglycerides was studied. In the presence of two substrates, the kinetics of enzymatic reaction was studied. Then the factors influencing on the microbial yield and CLA production including reaction conditions (reaction time, cell concentration and substrate...

Design of a Setup for Simultaneous Control of Multiple Magnetic Microrobots

, Ph.D. Dissertation Sharif University of Technology Khalesi, Ruhollah (Author) ; Nejat Pishkenari, Hossein (Supervisor) ; Vossughi, Gholamreza (Co-Supervisor)

Abstract

Microrobots (MRs) have attracted a lot of attention during recent years due to their promising biomedical applications. Due to their small size, these robots have limited capability to carry energy sources, sensors, or actuators, so researchers try to transfer energy from outside as much as possible. For this purpose, various actuation methods such as optical, acoustic, electric, and magnetic have been proposed. Magnetic field is the most used energy source. The current study deals with the design and implementation of a system for simultaneous independent control of multiple swimming magnetic MRs. The ability to control multiple MRs simultaneously and independently could lead to higher...

An Integrated Methodology for Business Process Reengineering In Project-Based Organizations

, M.Sc. Thesis Sharif University of Technology Nouri, Saeed (Author) ; Najmi, Manouchehr (Supervisor)

Abstract

The Study of antecedents and considering the status of Project-Based Organizations (PBOs) in our country such as MSA, Azarab, Sadad Machine, etc indicates that they are facing lots of problems in different aspects. This bad situation is in a way that amendment of part of sections guarantees the continuity of bad performance of these companies and we have to apply Business Process Reengineering and establishing a radical change in these firms. So the present research according to managers and experts opinions, several year observations of the writer and review of the literature of BPR, Project Management (PMBOK) and PBOs; and based on a library research, introduces the processes of PBOs in 3...

A Survey on Passing Sight Distance on Two-lane highways According to Road Conditions and Drivers' Behavior in Iran

, M.Sc. Thesis Sharif University of Technology Jokar, Hadi (Author) ; Vaziri, Manouchehr (Supervisor)

Abstract

The main factor ensuring safety of passing maneuvers on two lane highways is known as Passing Sight Distance (PSD). The criteria presented in Iran's code and AASHTO Green book are provided by the results of researches conducted between years 1938 & 1941 in the United States. This research intends to find out whether some changes should be applied to the PSD criteria according to current vehicles' performance and driving behavior in Iran. For this purpose, about 8 hours of video films has been recorded from 3 different sites chosen from two-lane highways in Iran, resulted in 326 passing records. In the case of passing of two passenger cars The models provided by analyzing the videos show that...

Study of Traffic Flow Characteristics in Frontage Roads in Iran

, M.Sc. Thesis Sharif University of Technology Poorjafari, Mohammad (Author) ; Vaziri, Manouchehr (Supervisor)

Abstract

Frontage roads are widely used to separate the main and the local traffic flows in multilane highways. Based on the studies conducted by Texas Transportation Institute, the delay imposed by ramp junction is considered for calculating the average speed in frontage roads in addition to the control delay caused by traffic lights. This delay and the capacity of frontage roads are analysed using gap acceptance theory. In this study, two different sections consisting of a basic section and merge area are selected along Tehran-Karaj special road as case studies and the required data are collected by video recording. After classifying and analysing the data, a wide range of macro traffic-analyses...

Influencers of Consumer Evaluations of Brand Extension vs. New Brand: Case of Iran’s FMCG Market

, M.Sc. Thesis Sharif University of Technology Ameri, Mina (Author) ; Najmi, Manouchehr (Supervisor)

Abstract

In today's competitive market we are witnessing the continouse production of new products. This forces companies to choose their branding strategies very carefully، since a wrong decision and a failure can lead to unfortunate consequences. So، Investegiating the factors that can affect new product branding strategies have become very important. Among these strategies, brand extention strategy has been more popular since it can increase the success probability of a new product. As a result، in this research we have investigated the influencers of evaluation of two branding strategies: brand extension and new brand. More specifically، this research aims to investigate the relation between...

Minimising Conflict in Concurrent Channels: Solico Groups Case Study

, M.Sc. Thesis Sharif University of Technology Karimi, Saman (Author) ; Najmi, Manouchehr (Supervisor)

Abstract

Increasingly adopting of multiple channels by companies in order to achieve greater market coverage and more sale, has made managers to deal with a new challenge of avoiding conflict in multiple channels. The importance of the issue and lack of empirical research provided motivation to study approaches to minimize multiple channel conflict and explore how they reduce conflict. Therefore a qualitative study using a single case (Solico Group) was conducted. After reviewing the literature 7 approaches were identified to minimize multiple channel conflict: Superordinate goals (goals that achieving them requires efforts and resources of more than one channel), Brand (using products with different...

Design of an Algorithm for Automatic Incident Detection by Using Loop Detector Data Compatible to Traffic Conditions in Iran

, M.Sc. Thesis Sharif University of Technology Asadabadi, Ali (Author) ; Vaziri, Manouchehr (Supervisor)

Abstract

Incidents are one of the main sources of delays and they have significant influences on road safety and congestions, air pollution and trip costs. In the time of an incident occurrence, minimizing the response time is essential for several reasons. The most important issue is providing aid for the injured. The faster the persons who are severely injured receive aid, the higher their chances are to be rescued. Also, if the rescue crews get to the incident scene faster the clearance procedure would be accomplished faster and this would result in fewer disturbances in traffic stream and lowering the probability of secondary incidents occurrence. Automatic Incident Detection, AID, has been...

Associating Vehicular Characteristics of Urban Fleet and Safety Factors with the Amount of Polluted Emissions

, M.Sc. Thesis Sharif University of Technology Elahi, Hamid (Author) ; Vaziri, Manouchehr (Supervisor)

Abstract

One of the methods that have been used in order to mitigate the air pollution problem is the IM program in order to identify the high polluting vehicle and make them to adjust their engine in accordance to the emission standards. In Iran due to the air pollution problems the government operates a rudimentary IM program based on the idle engine test utilizing an exhaust gas analyzer which should be done annually. While IM programs usually regarded as a useful tool for soothing the air pollution, one of the criticisms about the program is that it is required for the entire fleet and it reduces the cost effectiveness of the program. This research studies the relationship between the vehicular...

Analysis of Sight Distance in Railroad-Highway Grade Crossings in Iran

, M.Sc. Thesis Sharif University of Technology Ramezani, Alireza (Author) ; Vaziri, Manouchehr (Supervisor)

Abstract

In railway transportation network, there are spots that we have to intersect with highway network. These intersections break into two branches named grade crossing and unlevel crossing depend on their structure. Grade crossings from the view of protection are grouped into protected crossings and unprotected crossings. Protected crossings depend on their traffic control devices are categorized into active crossings and passive crossings.There are many factors that influence highway-railroad grade crossing design. Some of these factors can vary widely by drivers' behavior. These factors have been developed in models by AASHTO and its publications and shaped like we have them today. In order to...

Trade and Transportation Trends of Manufactured Goods in Asia-Europe-Africa

, M.Sc. Thesis Sharif University of Technology Sohrabi, Alireza (Author) ; Vaziri, Manouchehr (Supervisor)

Abstract

This research aims to study the trade trends of Manufactured goods, classified chiefly by Material, identified under Code 6 in the Standard International Trade Classification, SITC, and its nine divisions. The study scope covered 125 countries throughout Asia, Europe and Africa and 9 distinct years spanning a 40-year time period between 1965 and 2005. By means of this study, determinant factors for modelling and investigation of trade flow characteristics for the mentioned items can come to be better understood. The time-series data were grouped into four categories: bilateral trade value, socio-economic, geographical and transportation variables, obtained from centralized international...

Transportation Study in Tourist Villages, A Case Study of Niasar

, M.Sc. Thesis Sharif University of Technology Majdi, Omid (Author) ; Vaziri, Manouchehr (Supervisor)

Abstract

This study aimed to shed some light on travel behavior in tourist villages in Iran. Rural areas need efficacious transportation infrastructures and services to promote sustainable development and to avoid urban migration. By exploring the behavioural aspects of rural transportation, their transportation needs and demands can be effectively determined. Subsequently, accessibility and mobility of rural residents can be provided in a sustainable manner. In recent years, tourism has transformed lifestyle and behavior of some rural inhabitants. Utilizing secondary school students in Niasar, a simpliﬁed questionnaire was used to collect person and household data. Socio-economic, activity and trip...

Identification and Assessment of Nomadic Transportation and Analysis of its Supply and Demand for Mainly Herder Nomads - Case Study: Isfahan Qashqai Tribe

, M.Sc. Thesis Sharif University of Technology Mansouri, Mehran (Author) ; Vaziri, Manouchehr (Supervisor)

Abstract

Although villagers and nomads are an important part of Iran's population, the growth of cities has led to neglecting them and their needs including traveling and transportation needs. The aim of this study is to recognize and to study the transportation demands in a pastoral nomadic society. For this purpose, the theory of activity-based modeling was studied. Sequential modeling was chosen which considers the daily activities of each person as a result of five sequential decisions: a) choosing daily activity pattern; b) choosing primary tour time; c) choosing primary tour mode choice; d) choosing secondary tour time; and e) choosing secondary tour mode choice. In order to conduct a survey...

An Appraisal of the Trends of Trade and Transportation of Food Products Among Asia, Europe and Africa

, M.Sc. Thesis Sharif University of Technology Mirzazadeh, Babak (Author) ; Vaziri, Manouchehr (Supervisor)

Abstract

In this research, the trends of trade and transportation for the 10 subdivisions of food products and food products as a whole product based upon Standard International Trade Classification, SITC, have been appraised during the time period covering 1965 to 2005 among 125 countries in Asia, Europe and Africa. In this respect, the data of trade for the mentioned goods was gathered and other variables including gross domestic product, population, access to the international waters and area of countries and three transportation networks comprising two multimodal transportation networks and a unimodal network, during the cited period and for 125 countries was gathered. Then, regressions of trade...

Identification and Assessment of Nomadic Transportation and Analysis of its Supply and Demand for Mainly Farmer Nomads-case Study: Isfahan Qashqaees

, M.Sc. Thesis Sharif University of Technology Arvin, Ramin (Author) ; Vaziri, Manouchehr (Supervisor)

Abstract

Growth of cities leads to neglecting of travel behavior of nomads, although they are an important portion of Iran’s population. The aim of this study is recognition and studying transportation demand in a nomadic society that their households are mostly farmer. Firstly, the theory of activity-based modeling was studied. Sequential modeling was chosen for modeling which consider daily activities of each person as a result of five sequential decisions: a) Choosing daily activity pattern; b) Choosing primary tour time; c) Choosing primary tour mode choice; d) Choosing secondary tour time; e) Choosing secondary tour mode choice. In order to collect pertinent information and conduct survey,...