The X-ray beam is attenuated to a higher degree. by calcium, therefore less photons pass through. bone to the detectors, resulting in its âwhiteâ. appearance on CT. White matter is less cellular, contains myelinated. axons (fat), and has a higher water content than. gray matter, resulting in slightly lower.
The piston ring (PR) is a split band pressed against the wall of the cylinder by springs (S) mounted in the inner junk ring (JR). The tongue (T) maintains the seal as the ring expands and splits apart. Spring-loaded piston rings. A pair of piston rings mounted on a 47mm two-stroke cycle scooter piston.A piston ring is a split ring that fits into a groove on the outer diameter of a piston in a reciprocating engine such as an internal combustion engine or steam engine. Sealing the combustion chamber so that there is no transfer of gases from the combustion chamber to the crank. 2  Supporting heat transfer from the piston to the cylinder wall. 3  Regulating engine oil consumption.
It should be noted that nitrocarburising and nitriding are both used in the production of certain cast-iron piston rings as well. Tool steel piston rings are generally used where the durability of other materials is insufficient.As a piston ring, they can be an expensive option, but where ring wear or breakage is the limiting factor for engine durability, they can reduce rebuild frequency.t should be noted that nitrocarburising and nitriding are both used in the production of certain cast-iron piston rings as well. Tool steel piston rings are generally used where the durability of other materials is insufficient.