The aim of wound bed preparation is to create an optimal wound-healing environment by producing a well vascularised, stable wound bed with minimal exudate. Bacterial load has a direct impact on wound healing. The management of the bacterial load by either local or systemic therapy is important in wound management.
Refraction of Sound Waves. Refraction of waves involves a change in the direction of waves as they pass from one medium to another. Refraction, or bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves. So if the media (or its properties) are changed, the speed of the wave is changed.
Figure 1. (a) Paths of sound rays when temperature decreases with altitude, (b) paths of sound rays when temperature increases with altitude. The refraction of sound in the atmosphere is due to spatial variations in the air temperature, wind speed, and wind direction.The temperature usually decreases with altitude up to an altitude of 15â20 km.he refraction of sound in the atmosphere is due to spatial variations in the air temperature, wind speed, and wind direction.