Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Book Part Influence of High Sustained Axial Stresses on the Seismic Behavior of Full-Scale Substandard Reinforced Concrete Columns(CRC Press, 2025) Gundogan, S.; Demir, U.; Turan, O.T.; Ilki, A.Reinforced concrete (RC) columns are critical structural components that play a decisive role in the seismic performance of buildings. However, the combined effects of long-term sustained axial loads and seismic loading on these columns remain a pressing concern. In particular, design and construction deficiencies, coupled with material deterioration, often result in substandard RC columns experiencing long term axial stresses that far exceed typical service levels. These elevated stress conditions can lead to significant structural vulnerabilities, manifesting as collapses under seismic actions or even under gravity loads alone. Within this context, this study aims to investigate the impact of such high sustained axial stresses on the response of substandard reinforced concrete columns prior to be subjected to reversed cyclic lateral loading simulating seismic actions. For this purpose, two full-scale columns were tested under the combined actions of axial load and reversed cyclic lateral displacements. One of two columns were tested after it was exposed to a sustained axial load of 825 kN, corresponding to 70% of axial load capacity (fbh) for a duration of six months, while the other column was tested as the reference specimen right after it was subjected to same level of axial load. Comprehensive instrumentation during testing and detailed creep analysis under long-term applied axial loads were conducted to evaluate the response of the columns. The findings highlight the significant impact of long-term high axial stress on the seismic performance of substandard RC columns. © 2025 selection and editorial matter, Alphose Zingoni; individual chapters, the contributors. All rights reserved.Book Part 25 Years of FRP Research at Istanbul Technical University(CRC Press, 2025) Ilki, A.; Sari, B.; Goksu, C.; Demir, C.; Demir, U.; Töre, E.The application of fiber-reinforced polymer (FRP) composites for structural strengthening and seismic retrofitting has significantly advanced in recent decades. This study presents a com-prehensive review of FRP research conducted at Istanbul Technical University (ITU) in the last 25 years, which has closely aligned with global developments in the field. The research at ITU has focused parti-cularly on addressing the substandard characteristics prevalent in Türkiye's building stock. Investigations have spanned a wide range of specimens, from small-scale concrete prisms to full-scale three-dimensional reinforced concrete (RC) buildings. Key focus areas have included FRP applications for ductility enhancement, flexural strengthening and seismic retrofitting of structural members. Various FRP mate-rials have been examined, including aramid, glass, carbon, basalt and PET fibers. Multiple application techniques have been explored, ranging from externally bonded reinforcement to textile reinforced sprayed mortar. The findings from these extensive studies have consistently demonstrated the efficacy of FRP composites in enhancing the structural performance and seismic resilience of substandard buildings. This body of research has made significant contributions to the development of practical retrofit solutions tailored to the specific challenges posed by Türkiye's existing building stock and has broader implications for seismic risk mitigation in countries with similar construction practices. © 2025 selection and editorial matter, Alphose Zingoni; individual chapters, the contributors. All rights reserved.Book Part Algal Biofilm and Phycoremediation(CRC Press, 2024) Güneş, K.; Kaplangı, B.B.; Özkan, A.; Kucuker, M.A.Various physical and chemical methods have been extensively studied and explored for the remediation of heavy metals, pesticides, and other contaminants present in wastewater. However, the chemicals used in these methods lead to a second treatment, causing problems such as high cost and application difficulties. To overcome this problem, the bioremediation method is an acceptable pollutant removal alternative. It is used as an efficient biological agent in bioremediation studies in microalgae and bacterial strains commonly used in treatment systems. Phycoremediation refers to microalgae-based pollutant removal. In recent studies with algal bioremediation, Chlorella sp., Scenedesmus sp., Spirulina platensis, and Chlamydomonas sp. have been used mostly to remove organic and inorganic pollutants from water streams. In this section, definitions regarding algal biofilm, including its formation mechanism and applications in remediation, will be provided. Subsequently, the suspended and attached algal growth systems commonly employed for pollutant removal will be studied. Furthermore, diverse methodologies utilized for the valorization of algal biomass will be examined. © 2025 selection and editorial matter, Maulin P. Shah and Günay Yıldız Töre.Book Part Citation - Scopus: 1Red Sea Geothermal Belt Potential Clean Energy Source To Power Neom and Nearby Countries(CRC Press, 2024) Chandrasekhar,V.; Chandrasekharam,D.There is a great deal of clean geothermal energy available along the eastern flank of the Red Sea spreading axis, and along the western Arabian shield that can be utilized for generating clean water and electricity. It is estimated that these super-hot EGS (Enhanced Geothermal Systems) sources can generate 49 × 1011 kWh of electricity in a year, which is many times greater than the amount of energy that Saudi Arabia consumes annually (2.89 × 1011 kWh). In the coastal areas of the Red Sea, a similar amount of energy is also available along the western flanks of the ridge and on its eastern margin. A great advantage of harnessing the energy from the high heat flow ridge flanks is their proximity to the coastline and shallow depth from the sea surface. In addition to providing abundant potable water for the development of a sustainable green environment, this energy can power the entire western Arabian coast, as well as the ambitious “NEOM” development project of the Kingdom of Saudi Arabia. © 2024 selection and editorial matter, Najeeb M.A. Rasul and Ian C.F. Stewart; individual chapters, the contributors.Editorial Editorial Book Part Sourdough Microorganisms in Food Applications(CRC Press, 2023) Elvan, M.; Harsa, S.Sourdough contains a rich microflora consisting of bacteria and yeasts. The microorganisms vary according to internal and external factors contributing to the variety of sourdough. Lactic acid bacteria and yeast isolated from various sourdoughs have shown promising nutritional benefits, such as contributing to gluten degradation, increasing mineral bioavailability and vitamin stability, improving sensory quality of bread (i.e. flavor, color, and texture improvement), and other technological effects, such as an increased exopolysaccharides production with antifungal and antibacterial activities. Microorganism isolation and identification from sourdough play an important role in the production of novel industrial microbial cultures. Sourdough fermentations are suitable environments to isolate microorganisms, such as lactic acid bacteria and yeasts with antimicrobial and probiotic characteristics. The focus of the chapter is to highlight the importance of sourdough microorganisms in the nutritional, technological, and sensorial properties of food. © 2024 selection and editorial matter, Marco Garcia-Vaquero and João Miguel F. Rocha.Book Citation - Scopus: 5Editors’ Foreword(CRC Press, 2017) Figoli, A.; Hoinkis, Jan; Altinkaya, Sacide Alsoy; Bundschuh, JochenThe book focuses on Application of Nanotechnology in Membranes for Water Treatment but not only provides a series of innovative solutions for water reclamation through advanced membrane technology but also serves as a medium to promote international cooperation and networking for the development of advanced membrane technology for Universal well-being and to achieve the common goal of supplying economically, environmentally and societally sustainable freshwater and better sanitation systems. This book is unique because the chapters were authored by established researchers all around the globe based on their recent research findings. In addition, this book provides a holistic coverage of membrane development for water treatment, from the membrane preparation and characterizations to the performance for specific processes and applications. Since that water scarcity has become a global risk and one of the most serious challenges for the scientific community in this century, the publication of this book is therefore significant as it will serve as a medium for a good reference of an alternative solution in water reclamation. This book will provide the readers with a thorough understanding of the different available approaches for manufacturing membranes both with innovative polymeric systems and inorganic nano-materials which could give enhanced functionalities, catalytic and antimicrobial activities to improve the performance of the existing membranes. It will be useful for leading decision and policy makers, water sector representatives and administrators, policy makers from the governments, business leaders, business houses in water treatment, and engineers/ scientists from both industrialized and developing countries as well. © 2019 Elsevier B.V., All rights reserved.Book Part High-Performance Materials and Engineered Chemistry(CRC Press, 2018) Türk, Merve; Gümüş, Barış; Ustun, Fatma; Balköse, DevrimNano-sized nickel borate hydrate were precipitated from equimolar mixtures of dilute nickel nitrate and borax solutions at 25°C. Produced nickel borate samples were characterized by TGA, DSC, FTIR spectroscopy, X-ray diffraction, SEM, Elemental Analysis (EDX), Titration (nickel determination by EDTA, B<inf>2</inf>O<inf>3</inf> determination by NaOH), Particle Size Distribution, and Dehydration. The particles with 55 nm, 80 nm and 70 nm sizes were obtained for the cases without template, with span 60 and PEG 4000 in the reaction mixture respectively. The empirical formula of the vacuum dried precipitates were NiO.1.3B<inf>2</inf>O<inf>3</inf>.5.6 H<inf>2</inf>O, NiO.1.2B<inf>2</inf>O<inf>3</inf>.5.6 H<inf>2</inf>O and NiO.1.0B<inf>2</inf>O<inf>3</inf>.5.4 H<inf>2</inf>O for the cases without template, with span 60 and PEG 4000. The density of the nickel borate hydrates was around 2 g/ml and they had a color described by 157, 199 and 158 in RGB color scale. The nickel borate hydrates were amorphous in structure and no sharp peaks related to a crystal structure was present in their x-ray diffraction diagram. The effect of presence of span 60 and PEG 4000 were not significant on the particle size and chemical composition of the nanoparticles. © 2019 Elsevier B.V., All rights reserved.