gating


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gating

 [gāt´ing]
1. controlling access or passage through gates or channels.
2. selection of electrical signals by a gate, which passes signals only when a control signal, the gate pulse, is present, or which passes only signals with certain characteristics, such as a pulse height.
3. substrate-binding– or ligand-binding–induced opening and closing of a biologic membrane channel, believed to be due to conformational changes in proteins lining the channels.
cardiac gating selective acquisition of cardiac function information at specific points in the cardiac cycle by using information from the electrocardiographic signal to time the cardiac cycle and control image sampling. It has been used in digital subtraction angiography, computed tomography, nuclear cardiology, and magnetic resonance imaging.

gat·ing

(gāt'ing),
1. In a biologic membrane, the opening and closing of a channel, believed to be associated with changes in integral membrane proteins.
2. A process in which electrical signals are selected by a gate, which passes such signals only when the gate pulse is present to act as a control signal, or passes only the signals that have certain characteristics.

gating

Instrumentation
A process of electronic selection based on various parameters (e.g., particle size or amount of fluorescence), in which the observer selects a level of an electronic signal, above which a certain action is allowed.
 
Physiology
The opening and closing of an ion channel in a cell membrane, caused by conformational change in one or more transmembrane proteins, and regulated by transmembrane voltage and neurotransmitters.

gat·ing

(gāt'ing)
1. In a biologic membrane, the opening and closing of a channel, believed to be associated with changes in integral membrane proteins.
2. A process in which electrical signals are selected by a gate, which passes such signals only when the gate pulse is present to act as a control signal, or passes only the signals that have certain characteristics.
3. Organizing image data of a moving object (e.g., the heart) to freeze the object in a given phase.
References in periodicals archive ?
For automotive castings converted from iron, the tendency for many aluminum casting plants had been to keep the same general runner and gating configuration as the iron casting with only minor adjustments.
The modeling allowed Eck to produce castings off a new tool without changing the mold gating or cooling.
A critical area of gating system design, especially with the parting line system, is the sprue cup combination.
Gating size calculations were based on the law of continuity (Flow Rate = Area x Velocity).
Conventional gating systems, both pressurized and nonpressurized, attempt to remove nonmetallic contaminants through long runners, slag traps, swirl bobs and runner extensions.
Therefore, the velocity of the metal entering the gating system is constantly changing from mold to mold, resulting in constantly varying fill times for the same casting.
Applied to a gating system, it follows that the quantity of metal flowing through a system remains constant as long as it is kept full.
Good gating design involves three steps (placement, design and size) that always conform to the physical principles of a free flowing liquid.
This technique results in a heavy gating system, resulting in low yields.
Since we are gating into a runner and not into a gate, the size of the tunnel gate should be considerably larger than you might normally choose.
The gating system, also known as the runner system, consists of several passageways for metal to travel from the ladle to the casting cavity.