TR Dizin İndeksli Yayınlar Koleksiyonu / TR Dizin Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/20.500.14365/4
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Article Yeni Radyasyon Zırh Malzemelerinin Geliştirilmesi: Nadir Toprak Elementlerinin Rolü(2025-09-29) Şişman, Gizem; Yurt, Ayşegül; Akgungor, Kadir; Epik, Hakan; Kandemir, RecepBismut ve Kurşun, radyasyonun neden olduğu zarar ve kanser riskini azaltmak için yaygın olarak kullanılan koruma malzemeleridir. Ancak bu malzemeler, maliyetli ve bazı uygulamalar için pratik değildir. Bu çalışma, Monte Carlo simülasyonları kullanılarak çeşitli element ve bileşiklerin zayıflatma özelliklerini inceleyerek daha iyi radyasyon koruma malzemeleri geliştirmeyi amaçlamaktadır. GAMOS yazılımı, 0.1 ila 2.0 mm arasında değişen kalınlıklara sahip malzemeler ve 10 ila 150 keV enerji aralığındaki x-ışınları için simülasyonlar yapmak üzere kullanılmıştır. İlk simülasyonlar, bismut ve kurşunun kütle zayıflatma katsayılarını hesaplayarak bu malzemeleri doğrulamaya odaklanmış ve elde edilen değerler, NIST’in (Ulusal Standartlar ve Teknoloji Enstitüsü) verileriyle %2’lik bir fark içinde uyuşmuştur. Doğrulama sonrası, metaller ve nadir toprak elementleri içeren çeşitli koruyucu malzemeler simüle edilmiştir. Bunlar arasından, en yüksek kütle zayıflatma katsayısına sahip dört nadir toprak elementi katkılı bileşik seçilmiştir. Sonuç olarak, bu bileşiklerin 50–80 keV enerji aralığında bismut ve kurşuna kıyasla daha yüksek bir absorpsiyon sağladığı görülmüştür.Article Porphyridium Cruentum as a Biological Component for the Green Synthesis of Metal Nanoparticles and for the Evaluation of Their Antimicrobial Activity(Field Crops Central Research Institute, 2025-08-21) Mutaf, Tugce; Çalışkan, Gülizar; Oncel, Suphi; Elibol, Murat; Mutaf-Kilic, TugceSilver nanoparticles are an alternative to new-generation antimicrobial agents with their antimicrobial activity. Iron and zinc nanoparticles can potentially be used as UV protection in various applications. Nowadays, green synthesis of nanoparticles as a sustainable alternative attracts attention. Microalgae are promising in nanoparticle synthesis among biological sources due to their high biomass productivity and heavy metal accumulation ability. The present study aimed to investigate the potential of synthesizing intracellular silver, zinc and iron nanoparticles from Porphyridium cruentum microalgae. For nanoparticle synthesis, the effects of metal solution concentration and amount of biomass on particle size were investigated. The nanoparticles were characterized by dynamic light scattering, UV-vis spectrophotometry, and antimicrobial activity test. Silver nanoparticles of 169.7 nm, zinc nanoparticles of 189 nm, and iron nanoparticles of 356.7 nm were characterized by DLS. 169.7 nm silver nanoparticles were synthesized with 9.83 mM AgNO3 concentration and 0.19 mg/ml biomass: metal solution mixing ratio. The surface plasmon resonance band of silver nanoparticles was observed in the 300-350 nm wavelength range. According to the antibacterial activity results of silver nanoparticles, inhibition zone diameters were obtained as 10.83±0.76 mm and 11.33±0.57 mm against Escherichia coli and Staphylococcus aureus bacteria, respectively.Article Observing Conductance Quantization by a Novel Magnetic Control System(Gazi Univ, 2024-06-01) Ozturk, Yavuz; Çiğdem, Dila; Karakaya, Bilge Toprak; Değimli, Duru; Çelikoğlu, Meltem Gönülol; Gonulol, MeltemIn this study, a novel magnetic system that allows observing quantized conductance for undergraduate and graduate laboratories is presented. Bending of a magnetic cylindrical beam, like a cantilever, is controlled by an electromagnet to provide contact between needle type electrode and a plane of conductor. It is shown that by using the beam bending, it is possible to displace an object on the beam in nanometer and micrometer scale. The measured quantized conductance results prove that the designed system can be used for demonstration of the quantized conductance.Article Citation - Scopus: 1Integrating Light Elements in Fashion: Practice-Based Design Approach(Chamber of Textile Engineers, 2023-06-30) Vuruşkan, Arzu; Bulgun, Ender; Tekcan, ElifIn history, the relationship between fashion and technology has influenced the ever-changing silhouettes of the body, the quality of materials used to construct these silhouettes, and the colors giving liveliness to the material. Today, influenced by the digital revolution and innovation in advanced materials, the fashion industry benefits from the increasing possibilities of technology to develop alternative functions even to the most conventional dress forms, such as wedding gowns. This integration, which necessitates the contribution of different know-how and expertise, also provides a creative platform for developing interdisciplinary, practice-based design research and applications. In this study, an innovative wedding dress using light as a design element was produced with the joint contribution of designers and engineers based in Izmir, considered the capital of bridalwear in Turkey. This project, which considers light as a new design element that increases the expressive power of the dress, aims to offer an alternative to both the wedding dress category and the existing examples incorporating light technologies. In accordance with the main framework, research questions, and project design concept, the study conducts a literature review examining current design examples using different light technologies (LED, optical fibers, etc.). Following this, the stages of design, sample development and production processes are presented with relevant visuals. It is believed that this study, whose research, design development, and production processes are shared in detail, will set an example for future interdisciplinary projects. © 2023, Tekstil ve Muhendis. All Rights Reserved.Article Some New Approximate Solutions in Closed-Form To Problems of Nanobars(2021-12-20) Eroğlu, UğurcanFollowing recent technological advancements, a great attention has been paid to the mechanical behaviour of structural elements of nanosize. In this study, some solutions to mechanical problems of bars of nanosize are examined using Eringen’s two-phase nonlocal elasticity. Assuming the fraction coefficient of nonlocal part of the material is small, a perturbation expansion with respect to it is performed. With this procedure, the original nonlocal problem is broken into a set of local elasticity problems. Solutions to some example problems of nanobars are provided in closed-form for the first time, and commented on. The new solutions provided herein may well serve for benchmark studies, as well as identification of material parameters of nano-sized structural elements, such as carbon nanotubes.