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  Neuroplasticity in Neurodegenerative Diseases

  (Peter Lang Publishing Group, 2026) Kaya Sağlam, Öznur; Yaşasın, Yusuf; Demir, Cansu; Gür Özmen, Selen

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  [ No Abstract Available ]

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  Parallel Darboux Equidistant Ruled Surfaces in E3

  (Multidisciplinary Digital Publishing Institute (MDPI), 2026) Cevahir Yıldız, Ceyda; Şenyurt, Süleyman; Grilli, Luca

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  In this study, equidistant ruled surfaces generated by the Darboux vector, which has significant kinematic importance and characterizes the instantaneous rotation of a moving frame, are investigated specifically for the Frenet frame. By establishing a structural relationship between a surface and its equidistant ruled surface, transition formulas are provided for shape operators, Gaussian and mean curvatures, and fundamental forms, revealing that the equidistant surface is a scaled transformation of the original one. The obtained results demonstrate that both surfaces are developable and that the geometric properties of the equidistant ruled surfaces can be expressed dependently on each other. Furthermore, it is shown that the geometric character of the equidistant surface, including the invariance of asymptotic lines and the preservation of umbilical points under constant angle conditions, is determined by the rotational dynamics of the base curve. These findings constitute a theoretical foundation for cases involving the use of Darboux axes of different frames in higher dimensions or the investigation of similar structures in different geometric spaces. The geometric interpretation of this theoretical framework is elucidated through the fundamental properties of the surfaces. Finally, a concrete example is presented, where the symmetry of the central planes of the equidistant ruled surfaces at appropriate points is visualized using Maple 2017 software.

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  Comparative Investigation of Composite-Metal Lap Joints with Mono-Adhesive and Thermoplastic-Reinforced Mixed Adhesive at Elevated Temperatures

  (Taylor and Francis Ltd., 2026) Erbayrak, Engin; Eker, Beril; Çolak, Murat

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  This study primarily examines the strength of a single lap joint having a mixed adhesive overlap consisting of a single adhesive and its thermoplastic reinforced state under varying temperatures. In the single lap joint, Titanium-Boron reinforced A356 aluminum was employed as the metal adherend, while plain woven glass fiber-reinforced epoxy (GFRE) was employed as the composite adherend. In the application of the mixed adhesive overlap, the brittle adhesives were employed in the middle section of the lap joint, while the reinforcement of the thermoplastics was employed on the adhesives at both sides of the lap joint. The single lap joints were subjected to tensile tests at 1mm/min loading rates under room temperature and 120°C, which is the melting point of the copolyester. In the numerical analysis, the cohesive zone model was applied in order to define the adhesives; however, elastic isotropic and orthotropic material behaviors were employed for the metal and composite adherends, respectively. Eventually, it is determined that the strength of a mixed adhesive lap joint consisting of a single adhesive and its thermoplastic reinforced state is better than a lap joint made with the mono-adhesive alone. Although literature suggests that mixed adhesive overlaps can be formed using at least two different adhesives (one ductile and one brittle), this study demonstrated that a mixed adhesive zone can be created using a single adhesive and thermoplastic reinforcement.

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  The Boundedness and HU-Stabilities for Some Weighted Operators

  (Springer Nature, 2026) Keshavarz, Vahid; Kefayati, Zohreh; Abdeljawad, Thabet

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  In this paper, we introduce the concept of some weighted operators and on weighted Hardy spaces. After that we investigate the boundedness of those operators on. Finally, we investigate the Hyers-Ulam stability for weighted backward shift operator on and by using example, we show that it stable or not stable in which conditions.

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  Effect of Ti3C2Tx MXene Incorporation on the Mechanical Performance and Microstructural Characteristics of Bulk Molding Compound Composites

  (John Wiley and Sons Ltd, 2026) Yılmaz, Bilge; Meran, Cemal; Bilgi, Cahit

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  Bulk molding compound (BMC) composites are widely used in engineering applications; however, improving their mechanicalresponse through low-content nanoscale modification remains challenging for highly filled thermoset molding systems. In thisstudy, Ti 3 C 2 Tx MXene was incorporated into an industrial BMC formulation under unchanged compression-molding conditionsto investigate its influence on mechanical and microstructural characteristics. The unmodified BMC and composites containing0.238, 0.476, and 0.714 wt.% MXene were characterized using tensile testing, Izod impact testing, Shore D hardness, FTIR, XRD,TEM, SEM, and SEM–EDS. Ti 3 C 2 Tx MXene addition improved the mechanical response within the investigated low-contentrange. The average tensile strength increased from 14.24 MPa for unmodified BMC to 24.00 MPa for the 0.714 wt.% MXene-addedcomposite, a 68.6% improvement. The tensile modulus increased from 7.85 to 10.14 GPa, absorbed impact energy increased byup to 52.6%, and Shore D hardness increased from 70.6 to 75.8. TEM provided local evidence of MXene-related layered andpartially overlapped regions, while SEM–EDS supported Ti-containing MXene-related regions in powder mixtures and moldedbulk composites. BMC/MXene- 0.71 exhibited the highest average mechanical values, whereas BMC/MXene- 0.48 showed a morerepeatable mechanical response and a comparatively balanced distribution tendency.

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