Recep Tayyip Erdoğan Üniversitesi Kurumsal Akademik Arşivi
DSpace@RTEÜ, Recep Tayyip Erdoğan 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 yayınların etkisini artırmak için telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Nonlinear phase and group velocity analyses of hybrid nanocomposite-reinforced sports stadium roofs under aerodynamic pressures
(World Scientific, 2026) Tao, Hong; Yang, Yong; Yaylacı, Murat
The nonlinear performance of a hybrid nanocomposite-stadium roof in terms of group and phase velocity under aerodynamic pressure is being studied in this paper. The composite material is an epoxy matrix that is reinforced with graphene nanoplatelets (GNP) and carbon nanotubes (CNT) in a blend, thus having improved mechanical properties overall. The study uses the sinusoidal shear deformation theory, including a nonlinear shear function, and also Von Kármán’s geometric nonlinear effects are included. Based on Hamilton’s principle, the governing equations are derived, and the aerodynamic pressure is considered to be constant using the first-order piston theory. A notable aspect of the model is the auxetic foundation made of a Haber–Schaim foundation material, and these properties will have a major impact on the overall dynamic characteristics of the system. The harmonic method of balancing the problem’s geometry is also applied to nonlinear equations. An awesome iterative method is given for precise nonlinear phase and group velocity solutions. The results imply that the combination of a hybrid nanocomposite and an auxetic base influences the dynamic response of the roof system greatly. The roof’s nonlinear phase and group velocities display this intricacy, and the strengthening of the material and foundation markedly influences them. This study brings about a new direction for the design and analysis of future stadium roofs and also offers a firm basis for dynamically optimizing the performance under wind load. The results are of particular significance for the development of structural systems with nanocomposite reinforcements that are always exposed to aerodynamic forces.
Nonlinear dynamics and structural stability of arc-auxetic-tapered plates with piezoelectric patches for sports equipment applications
(World Scientific, 2026) Lin, Bing; Chen, Long; Yaylacı, Ecren Uzun
The research presented here delves into the nonlinear dynamics and structural stability of taper arc-auxetic plates that come with the application of piezoelectric patches, consequently, looking at their applications in sports equipment. The construction consists of an arc-like auxetic core with a negative Poisson’s ratio, along with piezoelectric face sheets to give the structure better mechanical performance. The plates have a variable thickness distribution, which is important in absorbing energy and deforming the material, hence under dynamic loading conditions. Transverse shear deformation plays an essential role in the proper analysis of tapered plates, and for that, higher-order shear deformation theory (HSDT) is used in a way to reveal the effects of this deformation. The main equations are obtained via Hamilton’s principle, which is a strong tool for the dynamic behavior of the system. A numerical solution is achieved using the differential quadrature method (DQM) based on high-order derivatives of the Gauss–Chebyshev–Lobatto function, and an iterative procedure offering high accuracy in the computation for complex geometries and boundary conditions. The results denote the dynamic response change of auxetic design to its energy dissipation and impact resistance properties, thus marking those two as the main characteristics for sport equipment. Besides, the stability analysis has also shown that piezoelectric actuation has an effect on the system’s performance, thus indicating the possibility of applying it for active vibration control. This study opens a new chapter in the field of innovative sports materials, where, besides dynamic stability and energy management, performance optimization is the key factor.
Theoretical foundations of energy finance: a multidimensional framework
(Springer Nature, 2026) Akusta, Ahmet; Gün, Musa
Energy has moved beyond its traditional role as a factor of production to become a central arena of financial activity, connecting global markets, investment practices, and policy design. This chapter reviews the conceptual and theoretical foundations of the energy–finance nexus, highlighting how financialization, systemic risks, and emerging green and digital finance mechanisms shape both market behavior and institutional responses. By drawing on neoclassical, Keynesian, behavioral, and complexity-based traditions, it develops a multidimensional framework that integrates economic, financial, technological, and political perspectives. The review shows that financialization tends to heighten volatility and market interconnectedness, while crises intensify the transmission of shocks across energy, carbon, and financial systems. Climate, geopolitical, and policy risks compound these vulnerabilities, influencing investment behavior, risk management, and governance structures. At the same time, green finance instruments, ESG investing, carbon markets, and digital platforms are beginning to transform the financial architecture that underpins the energy transition—although their effectiveness depends critically on consistent policy, strong governance, and inclusive frameworks. This synthesis demonstrates that the energy transition is inseparable from a financial transition. Effective policy design, risk mitigation, and equitable capital allocation are critical to aligning investment with sustainability objectives. By integrating theoretical perspectives and policy considerations, this chapter offers a roadmap for understanding the energy–finance nexus and informs future research and policymaking in the evolving global energy landscape.
Serum and cervical flushing fluid eicosapentaenoic acid levels in patients with unexplained infertility versus healthy controls
(Wiley, 2026) Kapucu Atas, Elif; Doğan Polat, Sibel; Yılmaz, Bülent; Şentürk, Şenol; Ayazoğlu, İlknur Merve; Kağıtçı, Mehmet; Mataracı Karakaş, Sibel; Yılmaz, Adnan
To compare the levels of eicosapentaenoic acid (EPA) in venous blood and cervical flushing fluid between patients with unexplained infertility and a control group, marking the first investigation of its kind in the literature. Recep Tayyip Erdogan University Education and Research Hospital-based cross-sectional study. This study was conducted with a total of 66 women (35 with unexplained infertility and 31 healthy controls) between 20 and 45 who attended the outpatient gynecology clinic between January 2023 and January 2024. Samples for EPA were collected in the midluteal phase and stored at −80°C, analyzed using EPA's ELISA kits. Baseline demographic and hormonal parameters were similar between the unexplained infertility and control groups. Serum EPA levels were lower in the unexplained infertility group, but the difference was not statistically significant. In contrast, cervical flushing fluid EPA concentrations were significantly reduced in women with unexplained infertility (p < 0.001). No correlation was observed between serum and cervical EPA levels (Spearman's ρ = 0.13, p = 0.28). In multivariate analysis, unexplained infertility independently predicted lower cervical EPA concentrations, explaining approximately one-third of the total variance (R2 = 34.3%). Cervical flushing fluid EPA levels were significantly lower in the unexplained infertility group compared to the control group. These findings suggest that local anti-inflammatory lipid imbalance in the cervical microenvironment may contribute to fertility impairment. Further studies are needed to clarify the potential role of EPA as a biomarker or therapeutic target in reproductive disorders.
Identification and development of pathogen- and pest-specific defense–resistance-associated ssr marker candidates assisted by machine learning and discovery of putative QTL hotspots in camellia sinensis
(Multidisciplinary Digital Publishing Institute (MDPI), 2026) Eminoğlu, Ayşenur
In this study, a targeted SSR (Simple Sequence Repeat) marker resource was developed based on genes and protein families associated with pathogen- and pest-related defense–resistance mechanisms in Camellia sinensis. Forty-one genes and protein families reported to show upregulation, increased expression, or functional validation under disease and pest stress were selected, and the corresponding 195 loci were mapped onto the Camellia sinensis cv. Shuchazao genome. SSR screening within gene bodies and gene-flanking regions (±5 kb) identified 5197 SSR loci. Putative QTL hotspot regions were defined using locus-based sliding-window analysis, Z-score calculations, and permutation tests, yielding 633 SSRs filtered at the 99% and 95% significance thresholds. Proteome-wide scans based on conserved amino acid motifs identified multiple loci within the WRKY, NAC, LRR, PRX, and CHI families, and Random Forest analysis was used to prioritize SSRs within these families. Finally, 386 SSR primer sets were designed and evaluated by in silico PCR across six tea genomes. Of these, 245 primers produced amplicons in more than one genome, and 124 exhibited polymorphic information content values greater than 0.500. Overall, the developed SSR panels represent a biologically contextualized and experimentally transferable marker resource targeting defense–resistance-associated genic and gene-proximal regions.
