Aksaray Üniversitesi Kurumsal Akademik Arşivi
DSpace@Aksaray, Aksaray Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Influence of web holes on cold-formed steel beams: Experimental and numerical analysis
(Elsevier Ltd, 2025) Oruç, Ramazan
This research investigates the impact of web holes on the bending behaviour of beams, presenting both experimental and numerical investigations. It also introduces a new design equation. The experimental study involved subjecting 11 beams with and without holes to a four-point bending test, considering variables such as hole dimensions, number of holes, and spacing. The moment carrying capacity and failure modes of the beams with and without holes were thoroughly examined. It was established that hole dimensions play a crucial role in both the moment carrying capacity and failure mode of the beams. The numerical study developed 106 finite element models to validate the experimental data and explore various parameters. The validation models demonstrated good agreement with the experimental results. The parametric study analyzed variables such as hole shape, size, spacing, location, and section thickness. It was found that the moment carrying capacity decreased when the hole height/web height ratio exceeded 0.67, and the web height/thickness ratio increased. The numerical study results were compared with the local buckling strength equations proposed by AISI S100, AS/NZS 4600, and the design equation in the literature. The comparison revealed the inadequacy of these approaches as hole dimensions increased. Consequently, a new design equation for local buckling strength calculations was proposed and compared with the results. The proposed equation yielded more consistent results, especially for members with larger hole sizes.
An Improved Numerical Solution of Modified Regularized Long Wave Equation by Quartic Trigonometric B-Spline
(10.1007/s40819-025-01832-x, 2025) Kirli, Emre; Mersin, Mehmet Ali
This study presents the application of a numerical method specifically designed to solve the Modified Regularized Long Wave equation, a crucial model in the analysis of non-linear wave dynamics. The proposed method employs a Quartic Trigonometric B-spline approach for spatial discretization, which ensures smooth and accurate interpolation across the spatial domain, while temporal integration is conducted using the well-established fourth-order Runge–Kutta (RK4) scheme, known for its stability and precision. To evaluate the performance of the method, it is applied to three test problems: the propagation of a single solitary wave, the interaction between two and three solitary waves. The invariant quantities are computed for all test cases. To ensure the stability of the method, a stability analysis is performed through the computation of eigenvalues. The results demonstrate that the proposed method achieves a high degree of accuracy in preserving the invariant properties and produces minimal error, highlighting its efficiency and reliability.
Turnover intention, collaboration and competences of intensive care unit nurses: A descriptive correlational study
(W.B. Saunders, 2025) Avcı, Miyase; Avcı, Ahmet
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Increasing microplastics pollution: An emerging vector for potentially pathogenic bacteria in the environment
(Elsevier Ltd, 2025) Tavşanoğlu, Ülkü Nihan; Akça, Gülçin; Pekmez, Tülay; Başaran Kankılıç, Gökben; Çırak, Tamer; Çağan, Ali Serhan; Özkan Kotiloğlu, Selin; Grossart, Hans-Peter
Microplastics (MP), plastic particles <5 mm, are of global concern due to their worldwide distribution and potential repercussions on ecosystems and human well-being. In this study, MP were collected from the urbanized Susurluk basin in Türkiye to evaluate their vector function for bacterial biofilms, both in the wet and dry seasons. Bacterial biofilms were predominantly found on polyethylene (PE), polypropylene (PP), and polystyrene (PS), which constitute the most common MP types in the region. Specific potentially pathogenic bacterial genera, including Pseudomonas sp., Comamonas sp., Salmonella spp., and Shigella spp., were prevalent on MP surfaces. Notably, PE and PP harboured numerous genera of potential human and/or animal origin such as Staphylococcus, Proteus, Escherichia, Enterococcus, and Enterobacter. Water quality played a pivotal role in bacterial biofilm formation on MP. Higher salinity in estuarine areas reduced bacterial abundance on MP, while the more polluted freshwater Nilüfer Stream harboured a higher abundance of total bacteria, particularly of potentially pathogenic strains. Seasonal variations, ambient water conditions, and polymer type are all factors that could influence bacterial colonization on MPs. This catchment-wide evaluation, which includes various habitat types (lentic and lotic systems), the enrichment of cultivable viable bacteria on microplastics (MPs) - a key factor in the spread of pathogens - has significant implications for both environmental and public health. Unlike controlled laboratory experiments or in-situ studies with various particles, this study emphasized the dynamic and complex nature of bacterial strains on MPs, which varied depending on seasonal dynamics and antropogenic impacts in open systems. Further research is needed to thoroughly investigate to fully explore the complex interactions among MPs, microbial communities, and their ecological roles, especially in the context of changing environmental factors across entire river catchments.
Does financial development support renewable energy consumption: Evidence from the UK
(Elsevier Ltd, 2025) Demirtaş, Cuma; Tiwari, Aviral Kumar; Soyu Yıldırım, Esra; Shahbaz, Muhammad
This study explores the effects of financial development on the use of renewable energy (RE) in the United Kingdom (UK) between 1980 and 2020, by taking control variables such as urbanization and economic growth into account. For this purpose, wavelet transforms and the fresh Fourier quantile causality test are employed. Our empirical findings demonstrate that both immediately and over time, the use of renewable energy (REC) is stimulated by financial development. Additionally, financial institutions' efficiency and market depth play a significant role in encouraging the REC. In line with the study's general conclusions, it is suggested that the UK should implement policies that increase the spread and effectiveness of financial institutions and financial markets in order to support environmental quality.
