Abstract: Automatic determination of Fourier harmonic order for computation of spectral information for diffraction structures described. An embodiment of a method includes automatically determining a Fourier harmonic order for computation of spectral information for periodic structures, wherein the determination of the Fourier harmonic order is based at least in part on the pitches in each of multiple directions of the periodic structures, material properties of the periodic structures, and characteristics of the periodic structures in which the materials are contained; and computing the spectral information for the periodic structures based at least in part on the determined Fourier harmonic order.

Abstract: An adjustable spray sorbent article for receiving aerosol spray and collecting the liquids and solids suspended therein. The spray sorbent article comprises a base article defined as a semi-permeable towel configured to enable solid particles or liquid droplets in an aerosol mixture to be caught while the air carrying such particles passes through and at least one of various attachment components, typically selected based on the target location for the base article. The base article is adapted so that when an aerosol spray is directed towards the base article, substantially all of the suspended particles, including all active ingredients therein as well as the propellants are captured while the suspending gas passes through. Through this action, the base article prevents such particles from accumulating on surfaces on being inhaled in mass by users, while still allowing fragrant particles to be emitted into the surrounding air more slowly.

Abstract: Automatic determination of Fourier harmonic order for computation of spectral information for diffraction structures described. An embodiment of a method includes automatically determining a Fourier harmonic order for computation of spectral information for periodic structures, wherein the determination of the Fourier harmonic order is based at least in part on the pitches in each of multiple directions of the periodic structures, material properties of the periodic structures, and characteristics of the periodic structures in which the materials are contained; and computing the spectral information for the periodic structures based at least in part on the determined Fourier harmonic order.