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
Speed breeding in perennial fruit crops as a novel strategy to reduce generation period
(Springer, 2026) Mir, Javid Iqbal; Shafi, Sadiah; Verma M.K.; Raja, Wasim Hassan; Nabi, Sajad Un; Sharma, Om Chand; Mansoor, Sheikh
Speed breeding has transformed plant breeding by reducing the generation period of annual crops, yet its potential as a tool to accelerate genetic gain in perennial fruit crops has not been fully explored. Perennial crops including apple and walnuts face a major bottleneck in breeding owing to their extensive juvenile stage, which delays the assessment and selection of desired traits. This review and conceptual framework explore a novel integration of speed breeding with strategic use of early-bearing genotypes as intermediate parents in hybridization programs to expedite cultivars development. In apples, the strategy involves utilizing columnar varieties, while in walnuts, lateral-bearing genotypes are employed to introduce early fruiting traits into elite genetic backgrounds. In addition, speed breeding can be complemented by high throughput phenotyping and precision breeding techniques to increase selection accuracy and maximize genetic gain. By implementing these strategies, breeders can decrease generation period and enhance breeding efficiency as they strive to satisfy the increasing global demands for high-yielding, resilient perennial fruit cultivars. This forward-looking strategy aims to redefine the perennial fruit crop development, ensuring sustainability and productivity while addressing the pressing challenges of climate change and food security.
Energy security, institutional quality, and geopolitical risks: evidence from türkiye and sub-saharan africa countries
(Springer Nature, 2026) Karadağ, Haydar; Güneş, Hakan; Ally-Simba, Hamis Miraji
This study examines the effects of energy security, institutional quality, and geopolitical risks on oil price uncertainty in the context of Türkiye and Sub-Saharan African countries. The literature emphasises that energy security is critical for sustainable economic growth and is directly affected by geopolitical tensions and weak institutional structures. Empirical findings show that energy security and geopolitical risks increase oil price uncertainty, inflation fuels uncertainty, and consumption increases play a mitigating role. Furthermore, political stability is a strong determinant of volatility. Descriptive statistics and correlation analysis show a negative relationship between energy security and oil price uncertainty, and a positive relationship between energy security and geopolitical risks. The results reveal that strengthening institutional capacity, diversifying energy sources, and enhancing international cooperation are critical for energy security and macroeconomic stability.
Biomechanical analysis of soft tissue thickness in residual limb: impact on stress distribution and interface pressure in prosthetic fitting
(Trans Tech Publications Ltd, 2026) Boudjemaa, Ismail; Khatir, Omar; Benkhettou, Abdekader; Sahli, Abdrahmene; Bouiadjra, Bel Abbes Bachir; Yaylacı, Murat; Benberk, Smail
The thickness of the residual limb’s soft tissue plays a crucial role in determining the mechanical behavior and stress distribution at the stump–prosthesis interface. Using finite element analysis (FEA), this study investigates the biomechanical effects of different soft tissue thicknesses (30 mm, 50 mm, and 70 mm) on stress distribution. A patient-specific finite element model of the residual limb was developed to simulate realistic anatomical and mechanical conditions. To replicate physiological loading, a static vertical load of 350 N was applied, and the interface between the residual limb and the prosthetic liner was modeled using appropriate contact mechanics. The results revealed that reducing the soft tissue thickness to 3 cm produced higher Von Mises stress concentrations (0.115 MPa) and contact pressure (0.0697 MPa), which may increase discomfort and the risk of tissue damage. Conversely, increasing the thickness to 70 mm reduced stress values (0.016 MPa) and contact pressure (0.0312 MPa) but led to excessive deformations (6.277 mm) that could compromise prosthetic stability. An optimal soft tissue thickness of 5 cm was identified, where Von Mises stress and contact pressure remained at moderate levels, offering a balance between stress distribution and mechanical stability. These findings provide valuable guidance for optimizing prosthetic socket design, as maintaining appropriate soft tissue thickness can enhance comfort, reduce pressure-related injuries, and improve the overall functionality of lower-limb prostheses.
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.
