Elliptical Crack Detection in Steel Beam Using Lamb Wave and SVM Learning Model

, M.Sc. Thesis Sharif University of Technology Soheilzad, Ensieh (Author) ; Hosseini Kordkheili, Ali (Supervisor)

Abstract

The use of Lamb waves as an effective method for structural health monitoring (SHM) and non-destructive testing (NDT) has attracted significant attention. The application of machine learning algorithms reduces complexity and minimizes errors in the use of Lamb waves. Elliptical cracks are among the common types of defects, and their detection plays a crucial role in ensuring structural integrity. In previous studies, there has been no specific focus on identifying elliptical cracks in terms of their size, orientation, and location. The proposed strategy for identifying elliptical cracks in this research consists of three main stages :Data generation, Lamb wave signal processing and feature...

The Removal of CO2 from Flue Gas by Using MOF/Graphene Hybrid Adsorbents

, M.Sc. Thesis Sharif University of Technology Pourebrahimi, Sina (Author) ; Kazemeini, Mohammad (Supervisor) ; Ganji, Ensieh (Supervisor) ; Bozorgzadeh, Hamid Reza ($item.subfieldsMap.e)

Abstract

Due to the increase in greenhouse gases in earth’s atmosphere in recent years and its devastating environmental outcomes, there has been an increase in research trying to reduce these gases especially CO2. Flue gas is one of the most important sources of CO2 emission. Among the many techniques of removal, capturing and CO2 separation from flue gas, physical adsorption by a solid adsorbent is considered as a suitable and economic option. Among the solid adsorbent that are used for adsorption of CO2, Metal-Organic frameworks have many interesting features such as high specific surface area and high internal free volume. Among the Metal-Organic frameworks, MIL-53 (Al) and MIL-101 (Cr) are two...

Performance Evaluation and Investigation of Nano-Ceramic Membrane in order to Purification of Hydrogen in Laboratory Scale

, M.Sc. Thesis Sharif University of Technology heidari, Marziye (Author) ; Sayf Kordi, Ali Akbar (Supervisor) ; Zamanian, Akbar (Supervisor) ; Ganji Babakhani, Ensieh (Co-Advisor)

Abstract

Purification of hydrogen, as a clean source of energy has attracted great deal of attention in recent years. Among all available H2 separation methods, membrane technology has been known as the most appropriate way to produce hydrogen with high purity. In this study, we have tried to synthesis and evaluate the performance of perovskite ceramic membranes. The aim of preparing this type of membranes is to use them in separation processes in order to achieve H2 with high purity of >99%. First, general concepts about membranes are discussed. Then synthesis, recognition and performance evaluation of some perovskite membranes are presented. To prepare membranes, ceramic powders are synthesized by...