Description
Tracheotomy is a surgical procedure which consists of making an incision on the anterior aspect of the neck and opening a direct airway through an incision in the trachea (windpipe). The resulting stoma (hole), or tracheostomy, can serve independently as an airway or as a site for a tracheostomy tube to be inserted; this tube allows a person to breathe without the use of their nose or mouth. Both surgical and percutaneous techniques are widely used in current surgical practice.
Description
Styrene maleic anhydride (SMA) is a synthetic polymer that is built-up of styrene and maleic anhydride monomers. The polymer is formed by a radical polymerization, using an organic peroxide as the initiator. The main characteristics of SMA copolymer are its transparent appearance, high heat resistance, high dimensional stability, and the specific reactivity of the anhydride groups. The latter feature results in the solubility of SMA in alkaline (water-based) solutions and dispersion.
Description
The steam water heater system consists of two major components: a heat exchanger and a blending valve. The interaction of these two components provides instantaneous and continuous hot water, given a steady supply of steam and inlet water.
The heat exchanger has inputs of steam and cold water that enter and stay separate via a coil or pipe system. The thermal difference of the two increases the temperature of the water, which is output to the blending valve. The thermal decline of the steam causes it to condense into water, which is then drained out.