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...

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...

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...

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....

Pore Scale Simulation of the Fluid/Fluid and Fluid/Rock Interactions on the Performance of Water Injection

, M.Sc. Thesis Sharif University of Technology Mousavi, Mohammad Javad (Author) ; Fatemi, Mobin (Supervisor) ; Pishvaie, Mahmood Reza (Co-Supervisor)

Abstract

Two-phase fluid flow physics in porous media is applied in various fields. Studies have shown that wettability and surface tension, which represent fluid-rock and fluid-fluid interactions, have a significant effect on the dynamics of the immiscible displacement. Although the effects of wettability and surface tension on the macroscopic behavior of fluid flow are known, there is less understanding of it at the micro scale. Considering the essential role of wettability and surface tension in various fields, this project seeks to investigate the effects of wettability and surface tension on the movement and distribution of fluids and the dominant displacement mechanisms within the porous media...

Experimental Investigation on the Performance of Preformed Particle Gel in Improving Oil Recovery by Low Salinity Water Injection in Heterogeneous Porous Media

, M.Sc. Thesis Sharif University of Technology Moshirpanahi Aliabad, Mohammad (Author) ; Ghazanfare, Mohammad Hossein (Supervisor) ; Fatemi, Mobin (Supervisor)

Abstract

Water production from high permeability regions such as fractures and channels in the reservoir can be considered as one of the problematic issues in oil production. In order to control water production, chemical methods such as polymer injection, surfactant injection, and foam injection are widely used, among all of them, Preformed Particle Gel (PPG) is the most efficient method.By injecting the preformed particle gel into the reservoir and blockage of fractures and high permeable regions, Injected water bypasses to the target zone. In this study, preformed gel with a unique formulation was synthesized by free radical polymerization method in the laboratory.Nano-Clay and Nano-Silica were...

Spatial heterodyning optical CDMA technique for near-field free-space optical communication systems [electronic resource]

, Article IEEE Journal of Optical Communications and Networking ; Vol. 1, No. 5, PP. 498-511, Oct. 2009 Salehi-Omran, A ; Salehi, J. A ; Sharif University Of Technology

An automated simple algorithm for realistic pore network extraction from micro-tomography images

, Article Journal of Petroleum Science and Engineering ; Vol. 123, issue , 2014 , pp. 164-171 ; ISSN: 09204105 Rabbani, A ; Jamshidi, S ; Salehi, S

2014

Abstract

Using 3-D scanned data to analyze and extract pore network plays a vital role in investigation of porous media's characteristics. In this paper, a new simple method is developed to detect pores and throats for analyzing the connectivity and permeability of the network. This automated method utilizes some of the common and well-known image processing functions which are widely accessible by researchers and this has led to an easy algorithm implementation. In this method, after polishing and quality control of images, using city-block distance function and watershed segmentation algorithm, pores and throats are detected and 3-D network is produced. This method can also be applied on 2-D images...

Essentials of sla for l2 teachers: A transdisciplinary framework, joan kelly hall, routledge, New york

, Article Iranian Journal of Language Teaching Research ; Issue 1 , 2020 , Pages 154-156 Salehi, M ; Sharif University of Technology

Urmia University 2020

Influence of pulse parameters on electrocodeposition of Cr-Al2O3 nanocomposite coatings from trivalent chromium bath

, Article International Heat Treatment and Surface Engineering ; Volume 6, Issue 4 , December , 2012 , Pages 178-184 ; 17495148 (ISSN) Salehi Doolabi, M ; Sadrnezhaad, S. K ; Salehi Doolabi, D ; Asadirad, M ; Sharif University of Technology

2012

Abstract

Cr and Cr-Al2O3 coatings were electrodeposited from Cr(III) bath with both pulsating and direct current onto copper substrates. Pulsating current resulted in homogeneous films of higher Al2O3 content and lower particle agglomeration than the direct current. Differences were more tangible at shorter duty cycles and pulse frequencies. Pulsating current improved both microhardness and corrosion resistance. The presence of alumina nanoparticles resulted in greater current efficiency, higher film microhardness and better corrosion resistance. Maximum current efficiency, highest microhardness and densest electrodeposited coatings were achieved at current density of 20 A dm-2, duty cycle of 40% and...

Optimum receiver design for transmitted-reference signaling [electronic resource]

, Article IEEE Transactions on Communications ; May 2010, Volume 58, Issue 5, P.1589-1598 Farhang, M. (Mahmoud) ; Salehi, J. A ; Sharif University of Technology

Abstract

Autocorrelation receiver (AcR) is usually used as the general receiver for transmitted reference (TR) communication systems on a quite intuitive basis. In this paper, we apply the principle of statistical invariance to obtain the optimum TR receiver on a decision-theoretic basis, and it is shown that the autocorrelation receiver is optimal only in a special case. Performance of the optimum receiver and the suboptimum AcR for some important modulation schemes is also evaluated. The results imply that allocating a part of the transmitted energy and bandwidth to reference pulses would not help improve the performance of the system and the optimal performance might be achieved via much simpler...

Multi-rate and multi-quality of service passive optical network based on hybrid WDM/OCDM system [electronic resource]

, Article IEEE Communications Magazine ; February 2011, Volume 49, Issue 2, PP. S39-S44 Beyranvand, H. (Hamzeh) ; Salehi, J. A ; Sharif University of Technology

Abstract

In this article we present a new scheme to support multirate and multi-quality-of-service transmission in passive optical networks based on a hybrid wavelength-division multiplexing/optical code-division multiplexing scheme. The idea is to use multilength variable-weight optical orthogonal codes as signature sequences of a hybrid WDM/OCDM system. To provide the requested classes of service, the code weight and code length of MLVW-OOCs are designed based on the characteristics of the requested classes of service. In order to mitigate multiple access interference, we propose to utilize a multilevel signaling technique and interference remover structure based on advanced optical logic gate...

Emerging OCDMA communication systems and data networks [Invited]

, Article Journal of Optical Networking ; Volume 6, Issue 9 , 2007 , Pages 1138-1178 ; 15365379 (ISSN) Salehi, J. A ; Sharif University of Technology

Optical Society of American (OSA) 2007

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...