The local ζ−function approach is implemented to regularize the natural path integral definition of the geometric entropy in the large mass black hole Euclidean manifold. The case of a massless field coupled with the (off-shell) singular curvature is considered. It is proved that the geometric entropy is independent of the curvature coupling parameter ξ avoiding negative values obtained in other...

Carapace, the protective shell of a freshwater snapping turtle, Chelydra serpentina, shields them from ferocious attacks of their predators while maintaining light-weight and agility for a swim. The microstructure and mechanical properties of the turtle shell are very appealing to materials scientists and engineers for bio-mimicking, to obtain a multi-functional surface. In this study, we have ...

A novel compact 4-way ultra-wideband short pulse power divider (PD) based on coaxial waveguide is proposed in this paper. nylon conical shell inserted to replace the original transformer oil with an air block at resonant place of PD widen working bandwidth. The junction all inner conductors smoothed increase fidelity and capacity. fabricated tested. results show that return loss better than 12 ...

In the present paper, a novel unconstrained higher-order theory (UCHOT) is applied to analyse free vibration of cylindrical sandwich shells with nanocomposite face sheets reinforced graphene platelets. UCHOT considers shear and thickness deformations. It assumed that cylinder includes soft core which embedded between functionally graded platelets composites (FG-GPLRC). FG-GPLRC sheet consists s...

Abstract The shape of the projectile seems to determine effect a ballistic impact and failure mechanism. In this study, numerical analysis with different shapes, i.e ., ogive, blunt, conical, hemispherical is performed. target circular sandwich plate an outer diameter 315 mm, which composed three layers thickness 1 mm for each layer. These will be filled materials such as 1100-H12 aluminum allo...

This paper presents a unified solution method to investigate the free vibration behaviors of laminated composite conical shell, cylindrical and an annular plate with variable thickness arbitrary boundary conditions using Haar wavelet discretization (HWDM). Theoretical formulation is established based on first-order shear deformation theory (FSDT), displacement components are extended series in ...