Graduate School of Natural and Applied Sciences

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Recent Submissions

Beyond brain drain: Spatial and non-spatial determinants of highly skilled Turkish professionals' mobility to Dutch city-regions Saçın, Hülya; Büyükcivelek, Ahmet Burak (2026-12-01) Global competition for talent has shifted from nations to city-regions, rendering traditional wage-driven migration models insufficient. This study examines the “New Wave” of highly skilled migration from Turkish metropoli...
Development of a tissue-engineered oral mucosal barrier model using poly (l-lactic acid) electrospun nanofibers Sarasati, Andari; YÜCEL, DENİZ; KENAR, HALİME; Wihadmadyatami, Hevi; Ozdemir, Neval Sevinc; Anggraeni, Rahmi; Hasırcı, Vasıf Nejat; Ana, Ika Dewi (2026-12-01) The oral mucosa is a crucial barrier that defends against external factors and regulates tissue permeability. To advance trans-epithelial drug delivery and dental biomaterials research, a robust in vitro model of oral muco...
Boosting the density of NV centers in diamond through nanosecond sub-bandgap laser irradiation Salci, Rumeysa; Ozdemir, Okan; Bilgin, Muhammed; Mansoor, Mubashir; Oral, Ahmet; Ozbay, Aisha G.; Arslan, Leyla C. (2026-10-01) Nitrogen-vacancy (NV) centers in diamond are the basis for a wide range of quantum sensing technologies, with a major engineering frontier being selective formation of NV centers on demand. However, creating engineered pat...
INVESTIGATION OF ALKALINE LEACHING AS A PRECONCENTRATION METHOD ON A TURKISH NICKEL LATERITE AND ITS EFFECT ON SUBSEQUENT ACID LEACHING Chapepa, Reginald Ngoni; Altun, Naci Emre; Department of Mining Engineering (2026-8-24) The aim of this study was to evaluate alkali leaching as a preconcentration method on a Turkish nickel laterite ore, with particular focus on its effects on nickel and cobalt enrichment and subsequent acid leaching perform...
Ulam Stability in C*-Algebras and its Connections to Rigidity Conjectures Saxena, Jayatra; Kaya, Burak; Department of Mathematics (2026-8-14) Roughly speaking, Ulam stability is the phenomenon of "approximate" morphisms between classes of objects in a category being close to actual morphisms. In this thesis, we study Ulam stability in the context of C*-algebras....
PERCEPTIONS AND EXPERIENCES OF PRE-SERVICE AND IN-SERVICE CHEMISTRY TEACHERS ON THE INTEGRATION OF ARTIFICIAL INTELLIGENCE Erol, Cansu; Boz, Yezdan; Department of Science Education (2026-8-14) This study aims to explore the perceptions, experiences, and recommendations of Turkish pre-service and in-service chemistry teachers regarding the use of AI-based tools in chemistry education. A qualitative design and pur...
LAYER-BY-LAYER ASSEMBLY OF POLYLACTIC ACID AND CHITOSAN FILMS DOPED WITH OLIVE LEAF EXTRACT AND DEEP EUTECTIC SOLVENTS FOR EXTENSION OF SHELF LIFE OF CHEESE PRODUCTS Ahmadova, Nazrin; Kahyaoğlu, Leyla Nesrin; Department of Biotechnology (2026-8-14) Active food-packaging films were developed by sequentially depositing olive leaf extract (OLE)-containing chitosan layers onto a poly(lactic acid) (PLA) substrate using a doctor-blade applicator. The films were designate...
Correlation between Insulation Degradation and Partial Discharge Characteristics under Accelerated Electrical Aging Alipour Vahid Sadabad, Pouya; Firuzi, Keyvan; Department of Electrical and Electronics Engineering (2026-8-14) Partial discharge (PD) is among the earliest indicators of insulation degradation in high-voltage (HV) equipment, often the only warning before a defect in a transformer, cable, winding, or switchgear causes failure. Despi...
ON THE ACCURACY OF REACTIVE-TRANSPORT MODELS FOR LARGE EDDY SIMULATIONS OF HIGH SPEED FLOWS Sakaoğlu, Sergen; Özyörük, Yusuf; Karaca, Mehmet; Department of Aerospace Engineering (2026-8-14) High-fidelity simulation tools are essential for modeling multi-species reacting flows, where temperature and species concentrations vary sharply and small-scale transport governs accuracy. Chemical kinetics and molecular ...
DESIGN AND SYNTHESIS OF CARBON-RICH CHROMOPHORES VIA CLICK-TYPE REACTIONS: EXPLORATION OF LINEAR AND NONLINEAR OPTICAL PROPERTIES Erden, Kübra; Dengiz, Çağatay; Department of Chemistry (2026-8-13) In recent years, organic materials with nonlinear optical (NLO) properties have attracted significant attention due to their applications in spectroscopic methodologies, the study of reaction dynamics, surface characteriza...
Comparison of machine learning and deep learning models for longitudinal infant mortality rate data: a study based on real world and simulated data Özhayat, Okan; İlk Dağ, Özlem; Department of Statistics (2026-8-12) Infant mortality remains a key indicator of national health and development, as accurate cross-country prediction is essential for guiding public health policy. However, comparative analyses in the literature remain constr...
Genomic insigths into social practices of an early sedentary community from Upper Mesopotamia Katırcıoğlu, Büşra; Somel, Mehmet; Department of Molecular Biology and Genetics (2026-8-10) Upper Mesopotamia is one of the most important centers of the Neolithic Transition. Çayönü Tepesi holds a special place due to its uninterrupted occupation during the Pre-Pottery Neolithic (PPN) period and its dynamic cult...
Compactness and Spectra of Hankel Operators Baki, Mehmet Orçun; Yazıcı, Özcan; Department of Mathematics (2026-8-7) Spaces of analytic functions and their operators are widely studied. Two of those operators are Toeplitz and Hankel operators. In analytic function spaces that are complemented in a larger space, the Toeplitz operator $T_\...
The core sets of complex manifolds and their properties Demir, Mustafa Yiğit; Yazıcı, Özcan; Department of Mathematics (2026-8-7) In this thesis, we review foundational literature investigating the properties and characterizations of core sets of complex manifolds, which are constructed utilizing plurisubharmonic functions. In the first framework, th...
The Capacitated Team Orienteering Problem With Transfers and Synchronization Külekçi, Beste; Ghaffarınasab, Nader; Computational Design and Fabrication Technologies in Department of Architecture (2026-8-6) This thesis introduces the Capacitated Team Orienteering Problem with Transfers and Synchronization (CTOPT-S), a profit-maximizing selective routing problem in which vehicles may exchange load directly at customer nodes, a...
Classification of Gastrointestinal Lesions from Endoscopy Data Sönmez, Necdet Can; Akar, Gözde; Department of Electrical and Electronics Engineering (2026-8-6) Accurate classification of gastrointestinal endoscopy images is important for diagnosis, yet manual assessment is subjective and subtle lesions may be overlooked. This thesis investigates endoscopic image classification us...
A FastKAN-Based Spatiotemporal Inverse Network for Robust Epicardial Potential Reconstruction in Electrocardiographic Imaging Tüysüz, Yunus Emre; Serinağaoğlu Doğrusöz, Yeşim; Akar, Gözde; Department of Electrical and Electronics Engineering (2026-8-5) Electrocardiographic imaging (ECGI) reconstructs epicardial potentials from body-surface measurements by solving an ill-posed inverse problem, where measurement noise, missing leads, and modeling errors can cause large err...
Constrained codes that enhance the reliability of resistive random-access memories Kırgeç, Selahattin Kaan; Hareedy, Ahmed; Department of Electrical and Electronics Engineering (2026-8-03) The approach of squeezing more transistors in the same area in order to speed up computing is no longer effective. Currently, researchers and engineers are searching for novel solutions that offer faster computing. One of ...
Assessing the impact of alkali and thermal disintegration on methane production and BPA leaching from polycarbonate microplastics in wastewater sludge Ayça, İpek; Sanin, Faika Dilek; Department of Environmental Engineering (2026-8-3) Microplastics (MPs) are persistent contaminants widely detected in environmental compartments. Wastewater treatment plants act as major sinks for MPs, with approximately 90% being retained in sewage sludge. Polycarbonate (...
Efficient Probabilistic Design of High-Performance Modern Low-Density Parity-Check Codes Tanrıkulu, Ata Oğuz; Hareedy, Ahmed; Department of Electrical and Electronics Engineering (2026-8-3) Because of their excellent asymptotic and finite-length (FL) performance, spatially-coupled (SC) codes are a class of low-density parity-check (LDPC) codes that has been gaining increasing attention. Multi-dimensional (MD)...

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