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Effects of the Different Mixture Techniques on the Hardened and Durability Properties of Recycled Aggregate Concrete
(Eastern Mediterranean University, 2025) Toker, Enver; Eren, Özgür (Supervisor)
Using recycled aggregate in the manufacturing of concrete is a green way to preserve natural resources and lessen pollution in the environment. Various treatment techniques are applied to enhance the appeal of using recycled concrete aggregate (RCA) in concrete; however, these techniques increase the cost of the product. This study examined how different mixing techniques impact the mechanical and durability properties of concrete with untreated RCA. For this purpose, eighteen different mixtures were made using two different RCA obtained from ready-mix concrete plant waste and old demolished building waste, three different mixing techniques (Normal mixing approach, two-stage mixing approach and sand envelope mixing approach) and three replacement levels (20%,30%,50%). In the study, it was determined that the two-stage mixing technique reduced the water requirement of concrete and improved the compressive strength by 3.3%, splitting tensile strength by 14.2%, modulus of elasticity by 4.2% and impermeability in RCAn series concretes. Moreover, it was determined that the concrete produced with natural aggregate obtained from old building waste had 21% higher compressive strength and 7.2% higher modulus of elasticity than the concrete with normal aggregate at 20% and 30% replacement levels, respectively. Keywords: concrete, recycling, aggregate, mixing, environment.
Voltage Sag Mitigation in the Distribution System by Optimal Allocation of Distributed Generation Units
(Eastern Mediterranean University, 2022) Kanzi, Saman; Sirjani, Reza (Supervisor)
In this thesis, a genetic algorithm (GA) based optimization is used to increase the voltage stability of a power network employing Distributed Generation (DG) Units. GA determines the best placements for DG Units in the power network. The number and sizes of DGs utilized are likewise calculated using the specified method. First, the backward/forward sweep method has been tweaked to enable for analysis of the iterative process' convergence. Then, rectified the issue without the use of GA has been applied. The key rationale for adopting GA to tackle the problem is that, given the quantity and size of DGs, determining the ideal locations for them might be quite difficult and time intensive. An index termed objective indices, which indicates the power flow and voltage deviation of the power network, is proposed to evaluate and compare the possible options. The bus voltages, and hence the network's VI, are determined using a Forward/Backward load flow. Moreover, by weight factors method (WF), because of the approach utilized, all WFs have an equal probability of influencing the output of the objective function, making them unified and dimensionless. As a result, by considering the number of buses affected by voltage sag has been considered to mitigate the voltage sag and enhancing voltage amplitudes in a radial distribution system. The findings imply that using DGs enhances the voltage stability of the network. Furthermore, because GA is an optimization algorithm, it may discover the best solution for the issue in terms of the number, size, and position of DGs after a given number of iterations. The thesis finishes with the best solution to the problem as well as the load flow data for the ideal condition. Keywords: Distributed Generation, Genetic Algorithm, Particle Swarm Optimization, Objective Function, Weight Factor, Backward/Forward Power Flow, Voltage Indices, Active and Reactive Power Losses.
7. Sınıf Müzik Dersi Kazanımlarına Yönelik Kodály Pedagojisi Temelli Ders Planları Önerilerinin Uzman Görüşleri Doğrultusunda İncelenmesi
(Doğu Akdeniz Üniversitesi, 2025) Koç, Almira; Müezzinoğlu, Alev (Tez Danışmanı)
Bu çalışmada, Kuzey Kıbrıs Türk Cumhuriyeti 7. sınıf müzik dersi öğretim programında yer alan kazanımlar dikkate alınarak Kodály pedagojisi temelli ders planlarının hazırlanması amaçlanmıştır. Bu ders planları alan uzmanlarının görüşleri doğrultusunda uygulanabilirliği, etkililiği ve programa uygunluğu değerlendirilmiştir. Bu çalışmada, tek durumlu gömülü durum çalışması deseni kullanıldığı ve bu çalışma nitel bir çalışmadır. Araştırmada veri toplama aracı olarak beş sorudan oluşan yarı yapılandırılmış görüşme formu kullanılmıştır. Hazırlanan ders planları görüşme formu kullanılarak uzman görüşlerine sunulmuş, uzmanların dönütleri doğrultusunda, hazırlanmış olan ders planları içerik analizine tâbi tutulmuş, yeniden düzenlenmiş ve son hâlini almıştır. Hazırlanan ders planlarında, 7. sınıf müzik ders kitabında yer alan Kıbrıs Türk halk şarkıları ve Türk şarkılarından oluşan toplam dokuz adet şarkı kullanılmıştır. Şarkıların seçiminde, Kodály pedagojisinin temel ilkeleri, araçları ve ders planlama aşamaları göz önünde bulundurulmuştur. Ders planları, Kodály pedagojisi, ilkeleri ve müzik öğretim programı kazanımları ilişkilendirerek dokuz haftalık ders planı hazırlanmıştır. Araştırmanın sonucunda, uzman görüşlerine göre Kodály pedagojisine dayalı olarak hazırlanan müzik ders planlarının, hedeflenen kazanımların öğrencilere kazandırılmasında etkili olduğu ifade edilmiştir. Ders etkinliklerinin planlanmasında, ritim, aralık ve ölçü zamanlarının öğretiminde basitten karmaşığa, kolaydan zora ve oyundan teoriye aşamalarına uygun bir yapı izlenmesi gerektiği vurgulanmıştır. Öğrencilerin derse olan ilgisini ve dikkatini artırmada kullanılan materyallerin etkili olduğu, ders planlarının Kodály pedagojisinin temel araçlarıyla uyumlu biçimde hazırlandığı belirtilmiştir. Söz konusu araçların doğru ve işlevsel şekilde kullanılması durumunda, şarkı öğretiminin öğrenciler açısından daha kalıcı hale geldiği ortaya konmuştur. Ders planlarında halk şarkılarına öncelik verildiği ve halk şarkıları öğrencilerin ilgisini çektiği ifade edilmiştir. Doğaçlama ve yaratma etkinliklerinin genellikle uygulama sürecinde yer aldığı, ayrıca basit ve bileşik ölçülerle ilgili öğrenme çıktılarının, Kodály pedagojisinde yer alan ritim öğretim sırasıyla uyum sağladığı belirlenmiştir. Tüm bu bulgular doğrultusunda, uzman görüşlerine dayalı olarak hazırlanan müzik ders planlarının, 7. sınıf öğretim programındaki kazanımların öğrencilere pedagojik ve müziksel beceriler yönünden aktarılmasında etkili bir temel oluşturduğu görülmüştür. Anahtar Kelimeler: 7. Sınıf kazanımları, Kodály pedagojisi, Kıbrıs Türk halk ezgileri, örnek ders planları, uzman görüşleri
Experimental Performance Analysis of Salt in Matrix Composites for Thermochemical Heat Storage
(Eastern Mediterranean University, 2022) Al-Ghosini, Abdullah Ibrahim; Aydın, Devrim (Supervisor)
Thermochemical heat storage (THS) is a promising technology for improving the utilization from renewable energy sources due to its low heat losses, high energy storage density, and long-term heat storage capability. In that regard, synthesis of new sorption materials is critical for advancing THS systems in the future. This study aims to develop composite sorbents and perform energetic, exergetic, and hygro-cyclic analyses for performance comparison of the tested composite sorbents. In this study, nine different THS materials were synthesized using pumice and vermiculite as the host matrices, and CaCl2, LiCl, MgCl2, LiNO3 as the sorbent salts. The nine sorption materials developed and tested in this study are; P-CaCl2, V-CaCl2, P-LiCl, V-LiCl, P-MgCl2, V-MgCl2, P-LiNO3, V-LiNO3, and P-CaCl2-LiCl. All developed composite materials were tested over four consecutive cycles, and their energetic, exergetic, and hygro-cyclic performances were comparatively investigated. It is worth to mention that the developed pumice-salt composites are novel and have not been investigated previously. According to the results, the highest energy density of pumice composites was obtained with P-LiCl at 356 kWh/m3 , and the lowest was with P-LiNO3 at 150 kWh/m3 . Similarly, for vermiculite composites, the energy density was obtained highest with V-LiCl at 492 kWh/m3 , and lowest with V-LiNO3 at 205 kWh/m3 . Based on the general observation, the energy density of vermiculite based-salts was higher; however, the desorption capability was lower compared to pumice based-salts. In addition, P-CaCl2-LiCl had the highest energetic cyclic efficiency among pumice composites (90%), while P-MgCl2 had the lowest with 60%. The highest and lowest energetic efficiencies were found with V-LiCl and V-LiNO3 at 91 and 77%, respectively, for vermiculite composites. The highest exergetic efficiency was obtained with P-LiCl and V-LiCl at 12 and 18%, respectively. The lowest exergetic efficiency were obtained as 3% with P-MgCl2 and 6% with V-LiNO3. According to the testing results, hygro-cyclic efficiencies of pumice-based composites were found higher when compared to vermiculite-based composites. In addition, pumice-based materials showed high structural stability also good thermal performance, and sorption/desorption kinetics over repeating cycles. Whereas vermiculite-based materials showed lower structural stability and desorption capability than pumice composites. The study results showed that the P-CaCl2-LiCl composite provides the highest energetic and hygro-cyclic efficiencies among all the tested sorbents and shows a high exergetic efficiency. Therefore, it could be concluded that pumice based multi-salt composites could be promising THS materials. Further work could be performed in this area for development and optimization of new pumice based multi-salt composites. Keywords: Thermochemical Heat Storage, Salt in Matrix, Pumice, Vermiculite, Sorption, Desorption, Sorbent, Performance Analysis.
Study of Green Space Morphology and Typology in Urban Landscape of Northern Nicosia
(Eastern Mediterranean University, 2022) Kahouei, Saloumeh Khayyat; Cömert, Nevter Zafer (Supervisor)
As cities are growing rapidly and more than half of the world’s population is living in urban areas, the quality of urban settlements has become a vital issue. The significant role of urban green spaces and vegetated areas have received attention from ecologists, environmentalists, and planners. Within this scope, one of the important issues that deal with green spaces is urban morphology in order to understand the morphology of green spaces. However, urban morphologists have only recently begun considering green space, and morphological analyses of green space are still rare. This study addresses this gap in historico-geographical and process typological approaches in order to examine the possibility of identifying “Green Space” as an individual element in urban structure. It proposes a systematic framework for assessing green space structure based on existing hierarchical theories in urban morphology introduced by M. R. G. Conzen, Caniggia, Kropf and Osmond. The framework is tested in the case of Northern Nicosia and particularly in three significant neighbourhoods, which are Köşklüçiftli, Çağlayan, and Yenişehır, to assess the opportunities provided by the framework, its limitations, and factors that played a role in its successful implementation. Keywords: Urban Morphology, Green Space, Typology, Cyprus, Nicosia