Investigating the relative permeability behavior in presence of capillary effects in composite core systems

, Article Journal of Petroleum Science and Engineering ; Volume 160 , January , 2018 , Pages 341-350 ; 09204105 (ISSN) Mohammdi Alamooti, A ; Ghazanfari, M. H ; Masihi, M ; Sharif University of Technology

Elsevier B.V 2018

Abstract

Successful designs for an injection process to improve reservoir recovery seek more accurate values of saturation dependent functions, including relative permeability curves. The ignorance on underlying heterogeneity (e.g. layering) might lead to inaccurate predicting of flow behavior in layered heterogeneous porous media. Analysis of experimental core flood results in composite core systems (the system) along with numerical simulation at the core scale can provide an insight into this problem, especially when the capillary effects are present. In this study unsteady state two phase displacements have been conducted on the system with different internal arrangements. The main contribution is...

Synthesis and Properties of Cationic Polynulcear Complexes of Manganese with the Anionic Keggin Type Polyoxometalates as Single Molecule Magnets Hx[Mn4O2(CH3COO)7(bipy)2]n[Kegiin-Polyoxometalates]m.yH2O

, M.Sc. Thesis Sharif University of Technology Daneshmand Kashani, Pargol (Author) ; Mohammdi Boghaei, Davar (Supervisor)

Abstract

Single molecule magnets due to their magnetic tunneling effect and the interaction they have with an external magnetic field are used widely in quantum computing and also the storage of data with high capacities. Polyoxometalates that are used as counter ions for cationic single molecule magnets, are able to affect their spin-couple nature via a magnetic exchange and also have an influence on the crystal accumulation in order to change the magnetic property of the molecule. In this research the probability of sedimenting a cationic single molecule magnet, [Mn4O2(CH3COO)7(bipy)2]+, with the use of anionic polyoxometalates with Keggin structures has been investigated. Thus, the single...

Numerical Analysis of a Plate Containing Multiple Circular Holes Via RKPM

, M.Sc. Thesis Sharif University of Technology Soltani Mohammadi, Siavash (Author) ; Mohammdi Shodja, Hossein (Supervisor)

Abstract

In this thesis, some new models have been solved via RKPM method, which is one of the meshfree methods family. These models have never been solved via meshfree methods and their analytical solutions do not exist. At first, the RKPM shape functions and their first derivative formulation in 1D and 2D have been presented and then by using FORTRAN program, the shape functions and their first derivative have been obtained. To verifying the code some functions have been reproduced. In the next step by using the governing equations and penalty method whose formulation exists in chapter 2; some famous examples in linear elasticity have been solved via RKPM to verify the FORTRAN code. At last; some...

Runtime Analysis of Self-adaptive Systems

, Ph.D. Dissertation Sharif University of Technology Bagheri, Maryam (Author) ; Movaghar, Ali (Supervisor) ; Sirjani, Marjan (Supervisor)

Abstract

Increasing the complexity of software systems, their ubiquitous presence in the human activities, and necessity to preserving the functional and nonfunctional requirements of the systems under an uncertain environment, increase the need for self-adaptive systems. A self-adaptive system changes its structure and behaviors in response to changes in its environment and the system itself. A key research challenge in the self-adaptive community is to guarantee that the system fulfills its requirements. This issue can be addressed by employing formal methods during the design of the software systems. However, the assurance techniques should be used during the execution of the system as well as the...

Crude Oil Hedging by Futures

, M.Sc. Thesis Sharif University of Technology Mohammdi, Marjan (Author) ; Keshavarz Hadad, Gholamreza (Supervisor) ; Zamani, Shiva (Supervisor)

Abstract

Risk in crude oil price is likely to occur due to changes in global oil demand, capacity of crude oil production and regional crisis. A future contract is the instrument primarily designed to hedge one’s exposure to unwanted risk. Hedging policies often implements through different hedge ratios estimation.
This study examines the performance of several econometrics models namely OLS, GARCH,BEKK,VECM-BEKK for the returns of West Texas Intermediate(WTI) oil spot and futures prices from 3 January 1995 to 31December 2010, to calculate static and daily time varying minimum variance optimal hedge ratios and suggest a crude oil hedge strategy.
We show that hedging effectiveness indicate...

Design and Manufacturing of Gradient Cellular Tibial Stem for Total Knee Replacement

, M.Sc. Thesis Sharif University of Technology Taheri, Atiyeh (Author) ; Farahmand, Farzam (Supervisor) ; Bahrami Nasab, Marjan (Co-Supervisor)

Abstract

Loosening of uncemented tibial component is one the most common causes of total knee prosthesis failure which is a result of short-term factors such as instability and incomplete osseointegration as well as long-term factors such as peri-prosthetic stress shielding and bone atrophy. Porous cellular structures for tibial stem have been considered as a solution to this problem. This project is aimed to achieve an optimal gradient porous cellular design of tibial stem that in addition to sufficient mechanical strength, provides a perfect osseointegration and prevents bone resorption by incorporating appropriate porosity size, small micro-motion and favorable stress distribution on bone. A...

Theoretical Investigation of Quantum Optical Amplifiers in Quantum Communications

, M.Sc. Thesis Sharif University of Technology Marjan, Negar (Author) ; Bahrampour, Alireza (Supervisor) ; Bathaee, Marzieh Sadat (Co-Supervisor)

Abstract

Signal transmission of information on noiseless and lossy channels is an important issue in data transmission. Using the amplifier in the transmission channels is a good solution to help send information on longer channels. In classical communication, information can be coded in the amplitude or phase of the field and an amplifier is responsible for amplifying these parameters. If we consider the conditions ideal and ignore electrical noises, Classical mechanics does not impose any restrictions on the amplification of arbitrary classical signals. Instead, in quantum telecommunications the information encoded on the quadrature of the electromagnetic field are mounted on quantum states, such...