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    A new approach to modelling closed cell nanofoams and analysis of their mechanical properties
    (Elsevier, 2022) Yildiz, Yunus Onur
    A new approach which is based on the discreet element method and can be used for modelling closed cell nanofoams is revealed in this study. Atomistic models of closed cell nanofoams with five different types of porosity are generated with the help of a proposed modelling technique in order to examine the role of the porosity. Following the generation of atomistic models, the mechanical behaviour is investigated by performing molecular dynamic analyses. The findings signify that such mechanical properties as elastic moduli, ultimate and yield stresses rise with decreasing porosity for both loading types. Additionally, dislocation extraction algorithm (DXA) analysis is carried out to observe the evolution of the deformation mechanism of atomistic models. Dislocation analyses show that the Shockley partial dislocation plays a huge role in the deformation mechanism.
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    Advanced Technologies and Recent Applications on Fuel Cell Powered Marine Transport
    (Springer Science+Business Media, 2025) Arat, Hüseyin Turan; Yildiz, Yunus Onur; Burgaç, Alper
    Lately, particularly in the last decade, the whole world has been doing its best to minimize the effects of global warming and CO[[inf]]2[[/inf]] emissions. Although the increasing population and power plants’ energy demand for fossil fuels slow down this process, technological progress counteracts the growing demand for a clean future for the world. Maritime transportation is also a large industry that needs to be efficient and environmentally friendly. Different alternative propulsion systems are designed for large marine vehicles that require significant power to navigate in an environmentally friendly, efficient, and low-cost manner. This section is to expand on the following topics: the areas of fuel cells in maritime transportation, their importance, advantages, and barriers, working systems of new technologies, the efficiency of hybrid systems, recent applications and new projects, life cycle assessments, economic/regulation aspects and how hydrogen and fuel cells may affect this industry in the near future in the context of new studies. Moreover, the key points of using hydrogen via fuel cells are analyzed. Its main advantage is being an efficient, resource-free, and environmentally friendly fuel in maritime transportation. © 2025 The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG.
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    Morphological evolution of irregularly shaped Au nanoparticles during the sintering process and their mechanical performance
    (Springer Int Publ Ag, 2023) Yildiz, Yunus Onur
    This paper's main aim is to improve the understanding of the sintering process. For this purpose, the irregularly-shaped nanoparticles were generated by using a new generation algorithm. Following the generation of atomistic models, different sintering scenarios were carried out to discover the best way of the sintering process for molecular dynamic simulations. Meanwhile, the morphological evolution of irregularly-shaped gold (Au) nanoparticles was examined during the different sintering scenarios. Additionally, adaptive common neighbor analysis (aCNA) is carried out to observe the evolution of the morphology of atomistic models. Moreover, the mechanical behaviour was investigated by using molecular dynamic analyses.
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    Radiation shielding properties of the doped carbon fiber-reinforced epoxy composites
    (Pergamon-Elsevier Science Ltd, 2023) Erdem, Serkan; Bulut, Fatih; Ozcan, Mehmet Erbil; Ogul, Hasan; Yildiz, Yunus Onur
    In this study, the linear attenuation coefficients of the doped carbon fiber-reinforced epoxy composites (Boron Oxide (B2O3), Lead Monoxide (PbO) and Zinc Borate (2ZnO 3B2O3 3H2O)) for the gamma radiation are inves-tigated with the help of the High Purity Germanium (HPGe) Detector. The doped carbon fiber-reinforced epoxy composites were prepared with different proportions of additive materials (10, 20, and 30 wt%) so that impact of the additive amount on radiation shielding could be properly analysed. The specimens were tested at 7 different energy levels ranging from 82.0 to 1332.0 keV with the use of HPGe detector. Further on, the effect of additive materials on mechanical properties was also examined. Findings indicate that all additives into composite ma-terials improve the gamma attenuation ability, and the best gamma shielding characteristic is obtained in the case of 30 wt% Lead Monoxide sample. On the other hand, 10 wt% additive materials provide increase in stiffness compared with undoped samples.