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

/gat·ing/ (gāt´ing) controlling access or passage through gates or channels.

gating

the organizing of image data so that information used to construct an image originates in the same point in the cycle of a repeating movement, such as a heartbeat. The moving object is thus frozen at that phase of its movement, and image blurring is minimized.

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.

gating

alteration of the transport function through a mucosa; can be effected by means of a chemical agent (chemical gating) or because of a change in electrical potential (electrical gating).
References in periodicals archive ?
There are two types of gating systems: pressurized and non-pressurized (Figs.
All gating components have a part to play in the design, but it is not known what impact any design changes will have on the overall system.
This article focuses on bottom gating for steel casting production and details this technique as a practical solution for controlling molten metal turbulence and eliminating flow-related defects.
Pre-engineered, standardized hot-runner systems and components include temperature controllers, torpedoes, sprue bushings, probes, thermocouples, modular and integral manifold system, and patented hot sprue bushings and gating bushings that use standard cartridge heaters but equalize the temperature profile to make it suitable for processing engineering resins.
Result: Implementing the modified gating method resulted in enhanced casting appearance and quality, eliminated sand inclusions, improved feed margin and increased yield by 11%.
eliminating the gating system for small and shallow steel castings.
To achieve the desired pour rate, the gating was sized to increase the flow by 5% for each junction, moving away from the choke (at the ingates).
If the gating system doesn't remove these materials, they migrate into the mold and end up in the finished casting.
Basically, a gating system is the series of channels through which molten metal travels from the ladle to the mold cavity.
Varian's Gating System Seen as a Promising Non-Invasive Technique for Advancing Conformal Radiotherapy Treatments and Improving Outcomes
Standard single-drop nozzles in three styles: Type 1 nozzles used where gate vestige is critical to appearance, or to minimize stringing or drooling; Type 2 nozzles for viscous materials when gate vestige is not critical, or when gating into a runner; and Type 3 valve gate nozzles for highly cosmetic gates, or when higher flow rates are needed.