A method of wrapping a floral grouping, preferably an orchid, with a wrapper which may be a sheet of material, a sleeve or a preformed pot cover. Channel models are developed to simulate the propagation impairment conditions associated with identified test scenarios. Accordingly, contact resistance between the oxide semiconductor layer and each of the source electrode layer and the drain electrode layer can be reduced; thus, a thin film transistor having favorable electric characteristics and a highly reliable display device using the thin film transistor can be provided. Forcing the belt below top-dead center of the flywheel sprocket and keeping the belt in tack reduces belt wear, stretching, and the tendency of the belt to wobble or sway as it is driving a flywheel.