Discrete dipole approximation (DDA) is used to calculate extinction efficiencies of porous silicate and graphite grains. We apply DDA first to the spheroidal solid grains assumed to be made of a large number of small scattering elements (dipoles). Then we systematically reduce the number of dipoles to model the porous grains. The extinction is studied as a function of wavelength, grain size and...

theoretically predictionq of the solvent effects of i - pentadecanoyl - 2 -docosahexaennyl - sn - glycerol3 - phosphocholin have been studied using 'jamey-lock quantiun chemical approximation and std - 30basis set within the onsager self-consistent reaction field (scrs') model all optimized conformers of i -pentadecanoyl - 2 -docosahexaenoyi - sn - glycerol 3 - phosphocholin as well as their to...

We describe a simple model for the melting and optical properties of a DNA/gold nanoparticle aggregate. The optical properties at fixed wavelength change dramatically at the melting transition, which is found to be higher and narrower in temperature for larger particles, and much sharper than that of an isolated DNA link. All these features are in agreement with available experiments. The aggre...

We describe a simple model for the melting and optical properties of a DNA/gold nanoparticle aggregate. The optical properties at fixed wavelength change dramatically at the melting transition, which is found to be higher and narrower in temperature for larger particles, and much sharper than that of an isolated DNA link. All these features are in agreement with available experiments. The aggre...

The effect of ice crystal surface roughness on light scattering by ice crystals which are large compared to the wavelength was studied, in particular changes to the 2D scattering patterns, azimuthally averaged phase functions, degree of linear polarisation patterns and asymmetry parameters for a range of orientations and roughness scales. It was found that roughness has an effect on light scatt...

We present the computation of effective refractive coefficients for inhomogeneous two-component grains with 3 kinds of inclusions with m incl = 3.0 + 4.0i, 2.0 + 1.0i, 2.5 + 0.0001i and a matrix with m m = 1.33 + 0.01i for 11 volume fractions of inclusions from 0% to 50%. The coefficients of extinction for these grains have been computed using a discrete dipole approximation (DDA). Computation ...