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 ?
Gating is a science and also an art that will yield defect-free castings with an acceptable yield provided the components are sized correctly.
Though gating and fencing are offering new hope for endangered bats, the species are threatened by other problems.
As reported in February, Mold Masters introduced this year its Melt-Disk system for pinpoint direct side gating with angled tips.
The function of a gating and risering system is to fill the mold cavity and promote directional solidification while reducing turbulence and avoiding air entrainment.
Advanced nozzle design offers interchangeable tip and gate configurations to accommodate most gating requirements.
Many studies about casting quality have concluded that properly designed gating systems play an important role in reducing or eliminating re-oxidation products.
To solve the inclusion problem and improve quality, the software was used to evaluate the gating and risering concepts and then analyzed the mold filling and solidification.
the gating system should be kept simple due to the high viscosity of molten steel;
SVG is also opening the doors for valve gating in leading-edge automotive applications like in-mold lamination, film-insert decorating, coinjection, hard-soft multi-material molding, gas assist, and long-glass composites.
Gating Layout: The gating system was designed for bottom-filling to reduce turbulence as the cavity fills and to provide "hot" risers for effective piping [ILLUSTRATION FOR FIGURE 3 OMITTED].
Waupaca, Wisconsin, the nation's third largest gray and ductile iron foundry, the adoption of new filtering and gating philosophies proved to be the right defense for winning the battle against nonmetallic defects.