Boubaker polynomials expansion scheme (BPES) solution to Boltzmann diffusion equation in the case of strongly anisotropic neutral particles forward–backward scattering

A polynomial expansion scheme is used to solve Boltzmann neutron transport equation in the case of strongly anisotropic neutral particles forward–backward scattering.     

Some transparent semi-conductor metal oxides: Comparative investigations in terms of Wemple–DiDomenico parameters, mechanical performance and Amlouk–Boubaker opto-thermal expansivity

Wemple–DiDomenico model parameters for oxides thin layers (Sb₂O₄, SnO₂, ZnO and WO₃) have been determined from experimental measurement of reflection R(λ) and T(λ) transmission ratios within the Ultraviolet–Visible–Near-Infrared (UV/VIS/NIR) domain (300–1800 nm). This study allowed deducing ε₁(λ) and ε₂(λ) expressions. Exploitation of results concerning their variations enabled estimating the plasma pulse ω_p, the relaxation time τ, the dielectric constant ε_∞ and susceptibility χ_e. Furthermore, opto-thermal and mechanical investigations have been carried out and discussed relatively to the already established optical and thermal characteristics.