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A pencil-beam radar A moving or sweeping pencil-beam radar. In optics, a pencil or pencil of rays, also known as a pencil beam or narrow beam, is a geometric construct (pencil of half-lines) used to describe a beam or portion of a beam of electromagnetic radiation or charged particles, typically in the form of a cone or cylinder.
Compact disc players use an astigmatic lens for focusing. When one axis is more in focus than the other, dot-like features on the disc project to oval shapes. The orientation of the oval indicates which axis is more in focus, and thus which direction the lens needs to move.
The component S1 of the system, situated between the aperture stop and the object O, projects an image of the diaphragm, termed by Abbe the entrance pupil; the exit pupil is the image formed by the component S2, which is placed behind the aperture stop. All rays which issue from O and pass through the aperture stop also pass through the ...
Provide a place to discuss common issues on architecture, buildings, construction related pages. Organise and categorise Category:Architecture; Ensure all pages meet the standards of Wikipedia:Cite sources. See also WikiProject Fact and Reference Check. Develop standards and templates for architecture, buildings, construction related articles.
An axial belt-drive exhaust fan serving an underground car park. This exhaust fan's operation is interlocked with the concentration of contaminants emitted by internal combustion engines. Mechanical ventilation of buildings and structures can be achieved by the use of the following techniques: Whole-house ventilation; Mixing ventilation
A "Conference on Systematic and Intuitive Methods in Engineering, Industrial Design, Architecture and Communications", held in London in 1962 [4] is regarded as a key event marking the beginning of what became known within design studies as the "design methods movement", leading to the founding of the Design Research Society and influencing ...
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