To detect heart sounds, the patient should be lying down and examined in a quiet room. Left-sided S3 is best heard at the apex of the heart (the lower pointed end of the heart) with the patient lying on his left side. It is a low-pitched sound and heard best using the bell of the stethoscope with light pressure.
Adorable animal families that will make you aww. Polystyrene is a type of polymer with thermoplastic properties produced from the petroleum-derived monomer, styrene. In solid form, it is a colorless and rigid plastic, but it may also be returned to a liquid state by heating, and used again for molding or extrusion.
6:33 AM How to inject Polystyrene, injection process, Injection speed, Polystyrene, Shrinkage No comments. Polystyrene is one of the best materials for injection moulding. Cycle times with polystyrene are usually short due to ease of melting, fluidity and reasonable set up times.Complex tooling can be used. The surface finish of the final product is also good, and the low mould shrinkage of polystyrene is a useful factor.owever, there are limits as too high injection speed can cause faults such as material degradation, air inclusion (bubbles), and burn marks due to inadequate tool venting. Shrinkage. As with every plastic material, polystyrene shrinks during cooling.