Cyclic Behavior of Interior Reinforced Concrete Beam-column Connection with Self-consolidating

, Ph.D. Dissertation Sharif University of Technology Salehi Mobin, Jalal (Author) ; Kazemi, Mohammad Taghi (Supervisor)

Abstract

A significant amount of research in self-consolidating concrete technology is being placed in evaluating the suitability of the material for use in structural applications. However, research is needed to confirm the ability of self-consolidating concrete structural elements to adequately resist vertical and lateral loads. In a reinforced concrete building subjected to earthquake type loading, the beam to column connections constitute one of the critical regions and they must be designed and detailed to dissipate large amounts of energy without a significant loss of stiffness or strength. In the experimental part of this study, four full size interior beam-column subassemblages with 3.0 m...

Cyclic behaviour of interior reinforced concrete beam-column connection with self-consolidating concrete

, Article Structural Concrete ; Volume 17, Issue 4 , 2016 , Pages 618-629 ; 14644177 (ISSN) Salehi Mobin, J ; Kazemi, M. T ; Attari, N. K. A ; Sharif University of Technology

Wiley-Blackwell 2016

Abstract

A significant amount of research on self-consolidating concrete (SCC) technology has been devoted to evaluating the suitability of the material for its use in structural applications. However, more research is required to confirm the adequacy of SCC structural members for resisting gravity and seismic loads. This study focuses on the experimental investigation of the seismic performance of interior reinforced concrete beam-column connections with SCC. Four beam-column connection specimens, three with SCC and one with normally vibrated concrete (NC), were designed for this experimental study. Factors such as concrete type (SCC or NC) and axial load ratio (0, 7.5 and 15 % of column section...

Designing a Model-Based Process and Architecture for Partial Automation of Software Development

, M.Sc. Thesis Sharif University of Technology Jalal, Ali (Author) ; Habibi, Jafar (Supervisor)

Abstract

Automation of the software development process is the software engineers' final goal, but with the current facilities and knowledge in software engineering, it is not possible to automatically generate the whole software. Usually all the software in a specific domain contain common behaviors, which by careful exploration of these common behaviors and automation of code generation in these sections, the cost and time of projects' execution can be reduced. According to Model Driven Development (MDD), the first step in software development is creating appropriate models. For creating models, metamodel is required; therefore, we need to create a specific motamodel for the chosen domain or use...

Travel Mode Choice with High Occupancy Toll Lane

, M.Sc. Thesis Sharif University of Technology Sadeghi, Hassan (Author) ; Samimi, Jalal (Supervisor)

Abstract

With the growth of the urban population and the increase in private car ownership, negative implications of transportation, such as traffic congestion and environmental pollution has increased. A good solution to this problem is development of traffic infrastructures. However, it is not sufficient by itself and better management strategies for solving these problems are needed. One of the related approaches, is high occupancy toll lane. The main purpose of this study is modeling user’s mode choice behavior in the presence of high occupancy toll lane and pricing some highway lanes in Tehran. Another important purpose of this study is to find affective factors that have an influence on users...

Study on Very High Energy Cosmic Ray at Tehran Surface

, Ph.D. Dissertation Sharif University of Technology Sheidaei, Farzaneh (Author) ; Samimi, Jalal (Supervisor)

Abstract

The cosmic ray astronomy was born in 1937 when Victor Hess flied with his balloon to the height of 17,500 feet. He found that the cosmic rays come from out of atmosphere. There are three fundamental questions from that time. The goal of all cosmic ray's experimental activities and related theories is finding out the answer of these questions. The first question is about the energy and composition spectrum of cosmic rays. The second one is finding the sources which can product the very high energy particles such as the protons with the energy of 1021eV found in some observatory such as AGASA and Haverah Park. The last question is the process of diffusion of cosmic rays in the galaxy. One of...

Experimental Investigation of Asphaltene Precipitation and Deposition in Enhanced Oil Recovery by Low Salinity Waterflooding

, M.Sc. Thesis Sharif University of Technology Hosseini, Ali (Author) ; Ayatollahi, Shahabadin (Supervisor) ; Fatemi, Mobin (Supervisor)

Abstract

Asphaltenes are a polydisperse mixture of the heaviest and most polarizable fractions of the crude oil. They are defined according to their solubility properties as being soluble in aromatic solvents but insoluble in light paraffin solvents. Asphaltenes are usually responsible for many problems like wettability changes of the reservoir rock, pore clogging in the reservoir porous matrix and fouling in wellbore tubing and production surface facilities. Most of the studies in the literature, addressing the asphaltene precipitation and deposition (APD), are investigating natural depletion or gas injection process such as CO2 flooding. These studies show that asphaltene deposition and...

Bioleaching of Heavy Metal from Industrial Incinerator Ash

, M.Sc. Thesis Sharif University of Technology Haddadian, Kamran (Author) ; Shayegan, Jalal (Supervisor)

Abstract

This study focused on the investigation of bioleaching of heavy metals from incinerator ash using Thiobacillus thiooxidans. Eight factors were examined for their significance on bioleaching using a Placket-Burman factorial design. Four significant variables (pulp density, Initial pH, sulfur Concentration and inoculation amount) were selected for the optimization studies. The combined effect of these variables on metal bioleaching was studied using a central composite design. Second order polynomials were established to identify the relationship between the recovery percent of the metals and the four significant variables. The optimal values of the variables for maximum metals bioleaching...

Experimental Analysis and Simulation of Pollution Distribution in Ground Water and Soil

, M.Sc. Thesis Sharif University of Technology Ziyari, Afshin (Author) ; Shayegan, Jalal (Supervisor)

Abstract

Underground water is one of major resources of drinking water in Iran and thus, its quality (in terms of absence of pollutants) is a matter of great importance. The main goal of this research was to investigate the pollution concentration in underground water and soil in two regions: Dasht-e-naz in Sari and the fields near Sarkhoun gas refinery. The second goal was to determine the source and measure the distribution of the pollutants (in case of presence) and determine potential risks caused by them. The first step was to perform experimental tests in the two regions. In Sari's Dasht-e-naz region, a number of wells were chosen for sampling according to the direction of underground water...

Designing Granular Sequencing Batch Reactor for Investigating the Effect of Influent Feeding Alkalinity and Rreactor pH on Aerobic Granulation

, M.Sc. Thesis Sharif University of Technology Rezasoltani, Samira (Author) ; Shaygan, Jalal (Supervisor)

Abstract

Laboratory experiments were carried out to investigate the effect of influent alkalinity and reactor pH on microbial species, morphology and performance efficiency of aerobic granules. The experiments were conducted in two L sequencing batch reactors (R1-R2) with different influent alkalinity and pH medium. pH in R1 ,with high influent alkalinity, was in the range of 7-7.5 and pH in R2 was adjusted in 4.5-5.5. The experimental results demonstrated that the dominated microbial species and structure of granules were different in two rectors. Acidic environment of R2 provide favorable condition for fungal growth and granules formed within first week of operation. On the other hand in R1,...

2D Compositional Simulation of Reservoirs using Finite Volume Method

, M.Sc. Thesis Sharif University of Technology Abdollahzadeh, Soleiman (Author) ; Pishvaie, Mahmoud Reza (Supervisor) ; Fatemi, Mobin (Supervisor)

Abstract

One of the main purposes of this project is to propose an efficient and stable algorithm of a semi-discretized formulation for compositional simulation of oil reservoirs. In this algorithm, all the equations including both mass balances and equilibrium equations are solved simultaneously. The gradient terms are discretized by the Finite Volume Method (FVM). The resulting Differential Algebraic Equation, the so-called DAE, are solved by MATLAB functions. Another novel technique developed, handles each block equations set, separately. In this block-by-block scheme, there are two set of equations; the primary (mass balance) and secondary (equilibrium) equations. In the primary ones, the...

Experimental Investigation of Fractures’ Water Shut-off in Low Salinity Water Injection Using Preformed Particle Gels

, M.Sc. Thesis Sharif University of Technology Sanandaji, Farshid (Author) ; Fatemi, Mobin (Supervisor) ; Ghazanfari, Mohammad Hossein (Supervisor)

Abstract

As the reservoir matures, especially in fractured reservoirs, oil production is usually accompanied by the production of some unwanted water. Water production causes environmental problems and imposes high costs on the production system, including the cost of separating water and oil, corrosion of facility, and sometimes, leading to abandoning well. One way to solve this problem is to use gels as a blocking agent. Today, preformed particle gels are used as an alternative to in situ gels, which can solve some issues of in-situ gels, such as uncertainty in gelling time and penetration depth.This research comprises three main parts. In the first part, four samples of preformed particle gels...

Experimental Investigation and Modeling of Flow ّunction Variation in Enhanced oil Recovery Using Low Salinity/Smart Water Injection in a Carbonate Reservoir

, Ph.D. Dissertation Sharif University of Technology Farhadi, Hamed (Author) ; Ayatollahi, Shahaboddin (Supervisor) ; Fatemi, Mobin (Supervisor)

Abstract

Low salinity water flooding (LSWF) as an efficient enhanced oil recovery (EOR) technique is proved to affect both, fluid-fluid and rock-fluid interactions to potentially release the trapped oil from the porous rock. Despite more than one decade of extensive research works on the low salinity water effect (LSWE), there are still many parameters to be studied for very complex cases. Therefore, in the first part of the experimental study of the dissertation, a systematic investigation on the effect of the initial wetting state (water-wet or oil-wet) of pure calcite is conducted to study the importance of fluid/fluid and fluid/rock interactions for LSWE investigation. In the case of initially...

Compositional Simulation of Reservoirs Using Finite Element Method

, M.Sc. Thesis Sharif University of Technology Mehrnia, Mohammad (Author) ; Pishvaie, Mahmoud Reza (Supervisor) ; Mobin, Fatemi (Supervisor)

Abstract

One of the main purposes of this study is to present a robust and yet efficient semi-discretized algorithm for compositional simulation. All the equations including both the mass balance and the phase equilibrium equations are solved simultaneously which forms a Differential-Algebraic set of Equations and is solved by utilizing an efficient MATLAB solver. Furthermore, another formulation and algorithm is proposed which is consisted of two sets of equations, the primary equations (differential mass balance equations) and the secondary equations (the algebraic phase equilibrium equations). The gradient terms in the primary equations are discretized by using finite element method (Galerkin...

Investigating the Role of Molecular Diffusion on the Performance of Non-Equilibrium Gas Injection in One of the Fractured Reservoirs in Iran

, M.Sc. Thesis Sharif University of Technology Rigi, Ahmad (Author) ; Ghazanfari, Mohammad Hossein (Supervisor) ; Fatemi, Mobin (Supervisor)

Abstract

Major parts of Iran's oil reservoirs are fractured carbonates, which need time to produce oil due to their much lower permeability than sandstone reservoirs. Molecular diffusion mechanism is an efficient mechanism in oil recovery from fractured reservoirs under gas injection conditions. The main subject of this work is to investigate the role of molecular diffusion mechanism in the non-equilibrium gas injection project and its role in increasing the oil recovery rate in two southern fractured reservoirs located in the west of Iran, taking into account the capillary pressure, as well as the change of interfacial tension closely miscible conditions is also investigated through simulation. The...

Simulation of continuous catalytic conversion of glycerol into lactic acid in a microreactor system: A CFD study

, Article Journal of Industrial and Engineering Chemistry ; Volume 104 , 2021 , Pages 258-271 ; 1226086X (ISSN) Jalal Sahandi, P ; Kazemeini, M ; Sadjadi, S ; Sharif University of Technology

Korean Society of Industrial Engineering Chemistry 2021

Abstract

Hand in hand with the flourish of the biodiesel industry, glycerol (GLY) as an inconvenient by-product has generated environmental and sustainability concerns. Devising measures for efficient transformation of GLY into value-added products is a promising solution. In this contribution, the transformation of GLY to lactic acid (LA) as a valuable chemical was investigated in a continuous process for industrial applications. In this regard, a catalytic method using heterogeneous Cu nanoparticles in NaOH solution was studied in a microreactor by a CFD simulation. A seven-inlet micromixer comprising an optimized mixing unit was incorporated for uniform distribution of the species. The effects of...

Spatial uncertainty quantification of desiccation cracks in clays with limit state-adjusted linear elasticity

, Article Modeling Earth Systems and Environment ; Volume 9, Issue 2 , 2023 , Pages 2285-2303 ; 23636203 (ISSN) Jamhiri, B ; Shadabfar, M ; Jalal, F. E ; Sharif University of Technology

Springer Science and Business Media Deutschland GmbH 2023

Abstract

Periodic cycles of flood and drought are aggravated by global warming, thereby inducing critical desiccation cracks in soils. However, the estimation and prevention of crack propagation is imperfect due to the imprecise field measurements and the underlying soil uncertainties. To address these issues, this study presents an alternative framework to assess the probability of crack propagation. Thus, a series of Monte Carlo sampling (MCS) and Gaussian random fields are employed to quantify the associated uncertainties. The results suggest that matric suction has a governing effect in the course of crack propagation and induces cracking particularly at shallow depths. Crack propagation tends to...

Sttudy of Effective Parameters on Biodegradation of Organic Waste

, M.Sc. Thesis Sharif University of Technology Malool, Mohamad Ebrahim (Author) ; Shayegan, Jalal (Supervisor)

Abstract

With the increasing population and expanding urbanization and changing consumption patterns and relative prosperity increases, the amount of waste generated has increased significantly. So the municipal waste management as one of the challenges that lie ahead for municipal and state has become. Therefore, different approaches have been proposed to solve this problem. In the past government used landfill or incineration program for waste management. Given the risks to the environment and human health are two ways to create and large amount of biodegradable solid waste, composting seems to be good approach for waste management. With using the process on an industrial scale by municipalities,...

Emerging OCDMA communication systems and data networks [electronic resource]

, Article Journal of Optical Networking ; Volume 6, Issue 9, 1 September 2007, Pages 1138-1178 Salehi, J. A ; Sharif University Of Technology

Abstract

I present an in-depth review of the trends and the directions taken by researchers worldwide in optical code-division multiple-access (OCDMA) systems. I highlight those trends and features that I believe are essential to the successful introduction of various OCDMA techniques in communication systems and data networks in the near future. In particular I begin by giving a comprehensive review of the construction of optical orthogonal codes (OOCs). Specifically I discuss the recently developed algorithms that are based on matrix algebra, which simplify and enhance the efficiencies of algorithms in OOC generation. In communication systems studies I first focus on and discuss various OCDMA...

Electroplating and characterization of Cr–Al2O3 nanocomposite film from a trivalent chromium bath [electronic resource]

, Article Anti-Corrosion Methods and Materials ; Vol 61, No 4, 2014, 205-214 Salehi Doolabi, M. (Mohsen) ; Sadrnezhaad, Khatiboleslam ; Salehi Doolabi, Davood ; Sharif University of Technology

Abstract

The main aim of this study was to improve current efficiency and to obtain thicker coatings via aluminum oxide (Al2O3) addition to the chromium (Cr) (III) bath. Design/methodology/approach ‐ Pure Cr and nanocomposite Cr–Al2O3 coatings were electrodeposited from Cr (III) bath onto cathode copper substrates by conventional method. Dependence of current efficiency to current density, Al2O3 content and particle size were investigated. Findings ‐ Current efficiency increased with Al2O3 amount and decreased with Al2O3 particle size. Maximum current efficiency was achieved at 25 A/dm2 for pure Cr and 30 A/dm2 for composite coatings. Al2O3 bath content, current density and stirring rate increased...

Experimental Investigation on the Performance of Preformed Particle Gel (PPG) in the Combined Injection of Low-Salinity Water and CO2: Conformance Control and for in the Naturally Fractured Systems

, M.Sc. Thesis Sharif University of Technology Abbasi Khoshkar, Peyman (Author) ; Fatemi, Mobin (Supervisor) ; Ghazanfari, Mohammad Hossein (Co-Supervisor)

Abstract

Excessive water production in highly heterogeneous mature reservoirs (water flooded or affected by water zones) leads to increased production costs. Water production causes sediment formation, creation of corrosion, water treatment and disposal, and finally due to the inefficiency of production, it leads to closure of the well.Among the methods introduced to reduce water production, the use of polymers and gels as an affordable and effective method has been widely used in enhanced oil recovery processes. The main mechanism in this method is blocking or limiting the major paths of water flow (fractures or high permeability zones) and thereby increasing sweep efficiency in water injection....