Itâs also essential for keeping your nerves, heart, and muscles functioning properly. Since calcium is so important for many of your bodyâs functions, its levels need to be within a tight range. A second calcium blood test, called the ionized calcium blood test, measures the amount of âfreeâ calcium present in your blood. âFree calciumâ refers to calcium thatâs not bound to any proteins and not together with an anion in your blood.
The hybrid ring coupler, also called the rat-race coupler, is a four-port 3 dB directional coupler consisting of a 3Î»/2 ring of transmission line with four lines at the intervals shown in figure 12. Power input at port 1 splits and travels both ways round the ring.
Scharfenberg coupler. Quick coupler, used in construction machines to allow the rapid change of buckets. Coupling, a device used to connect two shafts together at their ends for the purpose of transmitting power Universal coupling, a joint or coupling in a rigid rod that allows the rod to 'bend' in any direction.