A file extension is the set of three or four characters at the end of a filename; in this case, .obj. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically.
A threshold (or limen) is the point of intensity at which the participant can just detect the presence of a stimulus (absolute threshold) or the presence of a difference between two stimuli (difference threshold). Stimuli with intensities below the threshold are considered not detectable (hence: sub-liminal). threshold (or limen) is the point of intensity at which the participant can just detect the presence of a stimulus (absolute threshold) or the presence of a difference between two stimuli (difference threshold). Stimuli with intensities below the threshold are considered not detectable (hence: sub-liminal).
Comstock/Comstock/Getty Images. The threshold is the strip or wood or metal that runs across the bottom of an entry door frame. A threshold is an important factor in the energy efficiency of a home or building.It also has several additional purposes in the doorway. A threshold can be replaced, or improved, if it does not adequately perform its job.here are additional methods to help block the large amount of air that can slip underneath a door, even with a threshold in position. A popular method to stop the draft is to install a metal door sweep along the bottom of the entry door.