1. An exercise:
An exercise done for strengthening the arms and upper body, in which one lifts one's own weight while hanging from a bar.
A pull-up is an upper-body strength exercise. The pull-up is a closed-chain movement where the body is suspended by the hands, gripping a bar or other implement at a distance typically wider than shoulder-width, and pulled up.
As this happens, the elbows flex and the shoulders adduct and extend to bring the elbows to the torso.
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2. (electronics) A pullup resistor.
In electronic logic circuits, a pull-up resistor (PU) or pull-down resistor (PD) is a resistor used to ensure a known state for a signal.
It is typically used in combination with components such as switches and transistors, which physically interrupt the connection of subsequent components to ground or to VCC.
Closing the switch creates a direct connection to ground or VCC, but when the switch is open, the rest of the circuit would be left floating (i.e., it would have an indeterminate voltage).
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3. Pull-up jumper,
A basketball move in which a player dribble drives, stops and shoots a jump shot
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4. Duplicate every fourth frame
Mathematically for NTSC this is relatively simple as it is only needed to duplicate every fourth frame.
Various techniques are employed.
NTSC with an actual frame rate of 24⁄1.001 (approximately 23.976) frames/s is often defined as NTSC-film.
A process known as pullup, also known as pulldown, generates the duplicated frames upon playback.
This method is common for H.262/MPEG-2 Part 2 digital video so the original content is preserved and played back on equipment that can display it or can be converted for equipment that cannot.
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