In this article, a semi-analytical solution is provided to investigate the free vibration characteristics of rotating truncated conical shells surrounded by Winkler–Pasternak type foundation. It assumed that material shell composed epoxy as matrix and graphene nanoplatelets (GPLs) reinforcement dispersed in both thickness length directions shell. The modeled based on first-order shear deformati...

Abstract Underwater torpedo interception could be conducted by shell perforation or even warhead impact detonation with high speed projectiles. This work deals the projectile water entry and sequent penetration into underwater whereby both aluminium explosive are numerically studied. The model aluminum validated against test data for penetration. Targets located under 20 cm depth where shells a...

Many gamma ray bursts (GRBs) have been observed with the Burst-Alert and X-Ray telescopes of the Swift satellite. The successive ‘pulses’ of these GRBs end with a fast decline and a fast spectral softening, until they are overtaken by another pulse, or the last pulse’s decline is overtaken by a less rapidly-varying ‘afterglow’. The fast decline-phase has been attributed, in the currently-explor...

Femtosecond lasers (FSL) are playing an increasingly important role in materials research, characterization, and modification. Due to an extremely short pulse width, interactions of FSL irradiation with solid surfaces attract special interest, and a number of unusual phenomena resulted in the formation of new materials are expected. Here, we report on a new nanostructure observed after the inte...

Bioconversion of agricultural waste products to produce value-added fuels and chemicals offers potential economical, environmental and strategic advantages over traditional fossil-based products. The kinetics of acid hydrolysis of cellulose isolated from banana skin, cowpea shells, maize stalks and rice husk (agricultural waste) were studied at temperature ranging between 70 – 100C in a stirred...

We investigate steady states of a quasilinear first order hyperbolic partial integro-differential equation. The model describes the evolution of a hierarchical structured population with distributed states at birth. Hierarchical size-structured models describe the dynamics of populations when individuals experience size-specific environment. This is the case for example in a population where in...