Equipment at the end of a communications channel that receives signals and may perform other functions such as error detection.

The region of a Rieke diagram where the rate of change of frequency with respect to phase of the reflection coefficient is maximum for an oscillator; operation in this region may lead to unsatisfactory performance by reason of cessation or instability of oscillations.

1. A circular or ellipsoidal depression formed by collapse on the flank of or near to a volcano.

2. A slight, low- lying desert depression containing a central playa or saline lake with no outlet, as where a desert stream comes to an end or disappears by evaporation.

1. To excavate strata downward in a vertical line for the purpose of winning and working minerals.

2. To drill or put down a shaft or borehole.

A device or system where some extensive entity is absorbed, such as a heat sink, a sink flow, a load in an electrical circuit, or a region in a nuclear reactor where neutrons are strongly absorbed.