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In 1992, Pella entered the national retail market with windows and patio doors, adding select lumberyard distribution in 1994. In 2001, Pella introduced Pella Design Centers to mainstream market customers, as a “store-within-a-store inside Lowe's stores and staffed by Lowe's employees.
There are three basic types of storm doors: full-view, retractable screen, and ventilating. Full-view storm doors [1] typically include a full glass panel and most an interchangeable full screen. Retractable screen storm doors feature a screen that is rolled up into the frame of the storm door when not in use, and can be removed entirely.
Platform screen doors at the Fuda Station, Tokyo, Japan, 2023. Platform screen doors (PSDs), also known as platform edge doors (PEDs), are used at some train, rapid transit and people mover stations to separate the platform from train tracks, as well as on some bus rapid transit, tram and light rail systems.
To open the door, the motor turns the pulley, which in turn turns the belt, which in turn drags the door. To close the door, the reverse occurs. Historically, elevator doors were opened using simple harmonic motion by a set of mechanical linkages; the motor, geared down, would rotate linked arms, which in turn would drive the door.
Literally, shoji means "small obstructing thing" (障子; it might be translated as "screen"), and though this use is now obsolete, [4] shoji was originally used for a variety of sight-obstructing panels, screens, or curtains, [4] many portable, [94] either free-standing or hung from lintels, [95] used to divide the interior space of buildings ...
The screen-door effect (SDE) is a visual artifact of displays, where the fine lines separating pixels (or subpixels) become visible in the displayed image. This can be seen in digital projector images and regular displays under magnification or at close range, but the increases in display resolutions have made this much less significant.