Scopus İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/8651
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Article Messaging Brand Experience: Brand Ethicality, Brand Trust, Brand Attitudes(Taylor & Francis Ltd, 2026) Ozsacmaci, Bulent; Kilic, Tamer; Dursun, Tolga; Celik, SuleymanMessaging applications (e.g. WhatsApp/Telegram/Signal-type platforms) have become high-frequency touchpoints within integrated marketing communications. This study examines how the brand experience of messaging applications translates into brand attitudes through two parallel mechanisms: perceived brand ethicality and brand trust. We theorize that ethicality and trust serve as communication signals that arise from interface-level design and governance choices, such as plain-language privacy notices, granular consent flows, visible encryption and reliability cues, and third-party assurances. Using survey data from active messaging users, we validated the measurement model via CFA and tested a parallel-mediation structure with bootstrapped indirect effects. Results indicate that messaging brand experience exerts a positive direct effect on brand attitudes and significant indirect effects through both brand ethicality and brand trust, confirming that persuasion in messaging hinges on credibility and transparency signals embedded in the journey. Robustness checks across alternative specifications support these findings. Theoretically, the paper integrates behavioural foundations of persuasion with corporate communication by reframing governance artefacts as source/message credibility cues that shape ethical inferences and risk reduction. Managerially, the results recommend making ethical and reliability signals salient within messaging flows, aligning privacy-by-default language with value propositions, and orchestrating assurance elements across channels to improve attitudes and downstream performance.Article Analysis of the α-β Transition in Bismuth Titanate as a Function of Pressure and Temperature(Taylor & Francis Ltd, 2026) Kiraci, A.The temperature and pressure dependence of the damping constant (half-width) for the soft Raman mode in bismuth titanate, Bi2Ti4O11, was calculated using the pseudospin-phonon coupled (PS) and the energy fluctuation (EF) models in the vicinity of the transition at T-C = 513 K and P-C = 3.7 GPa. The order parameter that is associated with the observed soft Raman mode frequency and also the pressure-temperature phase diagram was used for this calculation of the damping constant. Our calculated values of both the Raman frequency and the damping constant were compared with the observed data from the literature. Finally, the values of the activation energy were deduced using our calculated damping constant via the Arrhenius plots.Article Seismic Vulnerability Assessment of a Historic Masonry-Timber Building: The Case of Katharina Hunting Mansion(Taylor & Francis Ltd, 2026) Cosgun, Turgay; Sayin, Baris; Ormecioglu, Tevfik Oguz; Samadi, Kamran; Akan, Asli Er; Haydaroglu, Furkan; Er Akan, Aslı; Uzdil, OguzHistoric buildings are clear testaments to human civilization, and their preservation is essential for the world's cultural heritage. This study examines a unique heritage building in Turkiye that represents a brief period of Russian rule and its architectural style. The structure, the historic Katharina Hunting Mansion, was constructed by the Russians in the Sarıkamış district of Kars Province following the 1877-1878 Ottoman-Russian War. The mansion features a unique Scandinavian saddle notch (known as 'v chashu' in Russian and 'çantı system' in the Black Sea region). A survey was conducted to determine the deformations of the building, which included the preparation of plans, facades, and sections. The architectural investigation revealed that yellow pine, a common species in the region's forests, was used as the construction material. Architectural restoration proposals were developed based on the results of seismic analyses and the classification of architectural elements as either later additions or missing components. A unique methodology that combines various seismic analysis methods in accordance with the applicable local seismic codes was performed for the seismic performance assessment. For this purpose, the finite element model of the historic mansion was subjected to linear, nonlinear, and kinematic analyses. In the analyses, both the local seismic code TBEC-2018 and the SRMGHS-2017 guideline were considered, due to the historical status and structural system of the building. This process determined whether the structure meets the Limited Damage and Controlled Damage performance objectives for DD-3 and DD-2 earthquake levels, as envisaged in the local seismic codes. The linear analysis revealed that the building met the seismic performance objective with respect to inter-story drifts. Furthermore, the results of the nonlinear pushover analysis also indicated that the building satisfied performance objectives regarding shear forces and corresponding displacements. Moreover, the kinematic analysis determined that all local collapse mechanisms occurred at DD-2 and DD-3 earthquake levels, except for the overturning mechanism under DD-2. Therefore, the restoration proposals recommended using clamping at the wall joints to prevent potential local collapse. This study contributes to the field by presenting a comprehensive methodology for the seismic assessment of historic masonry-timber buildings. Additionally, the seismic performance of this historic building, featuring a unique combination of masonry and timber elements, was found to be generally satisfactory and compliant with current local codes.Article A Coupled Modelling and Simulation Approach to Electromagnetic Sheet Metal Forming(Taylor & Francis Ltd, 2025) Aslan, Ozgur; Kabakci, Gamze Cakir; Sait, Ferit; Camalan, Caner; Baranoglu, Besim; Bayraktar, Emin; Cakir Kabakci, GamzeThis study presents a coupled numerical and experimental investigation of electromagnetic forming (EMF) for aluminium sheets. A custom simulation framework is developed in ABAQUS/Standard using user-defined material (UMAT) and load (DLOAD) subroutines. The magnetic pressure exerted on the workpiece is computed through a finite difference-based solution of Maxwell's equations and applied to the mechanical solver. The mechanical response of the material is modelled using a strain-rate-sensitive plasticity law calibrated for aluminium 7075-O. Experimental forming trials are performed using a custom-built EMF setup, and the results are compared with numerical predictions to validate the model. The comparison shows strong agreement in deformation profiles, confirming the predictive capability of the proposed simulation strategy. This work offers a reliable computational tool for optimising EMF processes and provides insights into material behaviour under high strain rate electromagnetic loading.Article Citation - Scopus: 1Finite Bivariate Biorthogonal N - Konhauser Polynomials(Taylor & Francis Ltd, 2025) Lekesiz, E. Guldogan; Cekim, B.; Ozarslan, M. A.; Güldoğan Lekesiz, E.A new set of finite 2D biorthogonal polynomials is defined using the finite orthogonal polynomials $ N_{n}<^>{\left (p\right ) }\left (w\right ) $ Nn(p)(w) and Konhauser polynomials. We present a connection between this finite 2D biorthogonal set and the generalized Laguerre-Konhauser polynomials. Also, we obtain several applications of finite bivariate biorthogonal N - Konhauser polynomials.Article Citation - WoS: 1Unveiling the Strain Uniformity Challenge: Design and Evaluation of a Pdms Membrane for Precise Mechanobiology Studies(Taylor & Francis Ltd, 2025) Duz, Nilufer; Gulsum, Yasin; Odeibat, Waleed; Uyanik, Ismail; Akar, Samet; Dincer, PervinMechanotransduction and mechanosensing enable cells to respond to mechanical stimuli, essential in various physiological functions. Specialized cell stretching devices use stretchable, transparent, and biocompatible elastomeric membranes to study these responses. However, achieving strain uniformity is a key challenge, affecting data accuracy and reliability. This study designed a polydimethylsiloxane (PDMS) membrane with optimized uniformity for electromechanical cell stretching. Finite element analysis optimized membrane size and shape, achieving a 90% strain uniformity index-a 233% improvement over commercial membranes. By tailoring material properties like cross-linker ratio and curing time, membrane failure issues were resolved, enhancing applications in tissue engineering and mechanobiology research.Article An Innovative Showcase of Similarity Methods for Accelerated Turbine Design Processes and Cost-Effective Solutions(Taylor & Francis Ltd, 2025) Kantar, Ece Nil; Ayli, Ece; Celebioglu, KutayThis study aims to design a containerized Francis-type turbine for installation on drinking water pipelines equipped with pressure-reducing equipment, enabling energy recovery from untapped hydraulic resources. The turbine, designed to operate unmanned and housed within a container, represents an innovative approach to harnessing residual energy in drinking water pipelines. The research methodology leverages similarity laws derived from a previously developed high-efficiency turbine facility as a foundation for the preliminary design. This approach diverges from conventional turbine design methods, offering significant time and cost efficiencies. It should be noted that similarity laws were used only for the preliminary dimensioning of the scale turbine. Following this initial design, design optimizations were carried out based on CFD, focusing on components such as the runner, to enhance performance and achieve the required power output without cavitation at the specified flow rate and head. The results demonstrate that the application of similarity laws expedites the design process while maintaining high efficiency, effectively addressing the unique constraints of the operational environment. Additionally, the study provides a comprehensive analysis of the advantages and limitations of employing similarity in turbine design. In conclusion, this research not only exemplifies a novel turbine design methodology that ensures operational similarity but also serves as a practical guide for reducing costs and design timelines in small hydropower applications.This now clearly states that similarity was used for the preliminary dimensioning, followed by optimization based on CFD.Article Citation - WoS: 9Citation - Scopus: 9A High-Accuracy Vieta-Fibonacci Collocation Scheme To Solve Linear Time-Fractional Telegraph Equations(Taylor & Francis Ltd, 2022) Sadri, Khadijeh; Hosseini, Kamyar; Baleanu, Dumitru; Salahshour, SoheilThe vital target of the current work is to construct two-variable Vieta-Fibonacci polynomials which are coupled with a matrix collocation method to solve the time-fractional telegraph equations. The emerged fractional derivative operators in these equations are in the Caputo sense. Telegraph equations arise in the fields of thermodynamics, hydrology, signal analysis, and diffusion process of chemicals. The orthogonality of derivatives of shifted Vieta-Fibonacci polynomials is proved. A bound of the approximation error is ascertained in a Vieta-Fibonacci-weighted Sobolev space that admits increasing the number of terms of the series solution leads to the decrease of the approximation error. The proposed scheme is implemented on four illustrated examples and obtained numerical results are compared with those reported in some existing research works.Article Citation - WoS: 4Citation - Scopus: 4Microstructure and Mechanical Properties of Al-Co High Entropy Alloys(Taylor & Francis Ltd, 2022) Ayrenk, A.; Kalay, IThe structure and mechanical properties of non-equiatomic Al8Co30Cr18Fe9Ni31Nb4, Al8Co30Cr18Fe9Ni31Nb2Ti2 and Al8Co30Cr18Fe9Ni31Ti4 high entropy alloys (HEAs) were investigated using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), hardness and tensile testing. TEM and XRD analyses revealed the formation of gamma''-Ni3Nb/gamma (FCC), double FCC and gamma'-Ni3Al/gamma (FCC) structure for as-cast Al8Co30Cr18Fe9Ni31Nb4, Al8Co30Cr18Fe9Ni31Nb2Ti2 and Al8Co30Cr18Fe9Ni31Ti4 HEAs, respectively. The hardness and yield strength values were found to increase with the addition of Nb while the ductility of alloys increased with the increase in Ti concentration, significantly. The as-cast Al8Co30Cr18Fe9Ni31Ti4 alloy exhibited an excellent combination of ultimate tensile strength of 844 MPa and an elongation of 29.8% due to the coherent phase relation between gamma' precipitates and gamma matrix. The fractured surfaces of as-cast Al8Co30Cr18Fe9Ni31Nb4, Al8Co30Cr18Fe9Ni31Nb2Ti2 and Al8Co30Cr18Fe9Ni31Ti4 HEAs showed typical dimple type ductile fracture under tension test.Article Citation - WoS: 29Citation - Scopus: 21A New Fractional Infectious Disease Model Under the Non-Singular Mittag-Leffler Derivative(Taylor & Francis Ltd, 2022) Liu, Xuan; Ur Rahmamn, Mati; Ahmad, Saeed; Baleanu, Dumitru; Nadeem Anjam, YasirIn this manuscript, we consider a fractional mathematical model, which describes the dynamics of infectious disease, under the non-singular Mittag-Leffler derivative. The model under consideration is the extension of the SIRV model, where the infectious class has been divided into two compartments, namely the acute and chronically infectious individuals. First, we obtain the possible equilibrium states of the given model. With the help of the next generation matrix approach, the reproduction number has been calculated for the system to find conditions on the spread or control of the disease. Additionally, a new concept of strength number and analysis of the second derivative of the Lyapunov function has been used for the detection of waves. We investigate the said problem for qualitative analysis and determine at least one solution by applying the approach of fixed point theory. For approximate solution, the technique of iterative fractional-order Adams-Bashforth scheme has been used. Numerical simulation for the proposed scheme has been performed at various fractional-order lying between 0, 1 and for integer-order 1. All the compartments show convergency and stability with growing time. A good comparative result has been given by different fractional orders and achieves stability faster at the low fractional orders.