A robust empirical correction formula has been developed for the approximation of Lorentzian widths, using a known spectrometer bandpass, in instrument-broadened Voigt bands in optical spectra. The relationship between analytically calculated [(w(Voigt) - w(Lorentz))/w(Gauss)] and [w(Voigt)/w(Gauss) - 1] values (where w is the full width at half-maximum [FWHM]) is analyzed to derive the formula...

Under certain circumstances, Voigt waves can propagate in a biaxial composite medium even though the component material phases individually do not support Voigt wave propagation. This phenomenon is considered within the context of the strong– permittivity–fluctuation theory. A generalized implementation of the theory is developed in order to explore the propagation of Voigt waves in any directi...

Abstract We present numerical techniques for calculating instability thresholds in a model thermal convection complex viscoelastic fluid of Kelvin–Voigt type. The theory presented is valid various orders an exponential fading memory term, and the strategy obtaining neutral curves discussed general case. Specific results are order zero, also known as Navier–Stokes–Voigt fluid, fluids 1 2. For la...