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Ablaq (Arabic: أبلق; particolored; literally 'piebald' [1]) is an architectural technique involving alternating or fluctuating rows of light and dark stone. [ 2 ] [ 3 ] It is an Arabic term [ 4 ] describing a technique associated with Islamic architecture in the Arab world . [ 5 ]
Beam astigmatism: The beam is astigmatic when the vertical and horizontal parts of the beam focus in different locations along the beam path. Beam wander or jitter: The amount that the centroid or peak value of the beam profile moves with time. Instruments and techniques were developed to obtain the beam characteristics listed above. These include:
Bead and reel is an architectural motif, usually found in sculptures, moldings and numismatics. It consists in a thin line where beadlike elements alternate with cylindrical ones. [1] [2] It is found throughout the modern Western world in architectural detail, particularly on Greek/Roman style buildings, wallpaper borders, and interior moulding ...
True polygonal masonry is a technique wherein the visible surfaces of the stones are dressed with straight sides or joints, giving the block the appearance of a polygon. [ 1 ] This technique is found throughout the world and sometimes corresponds to the less technical category of Cyclopean masonry .
Pendant fan vault of Henry VII's chapel at Westminster Abbey. Pendant vault, St. Madeleine, Troyes. Pendant vaulting is considered to be a type of English fan vaulting.The pendant vault is a rare form of vault, attributed to fifteenth century English Gothic architecture, in which large decorative pendants hang from the vault at a distance from the walls.
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.
The proliferation of these more-efficient AI development techniques could ultimately pose greater security challenges than the concentrated development of chip-intensive systems by major state actors.
These distortions generally do not possess figure-of-revolution symmetry and are thus astigmatic, and slowly become permanently polished into the surface if the problems causing the distortion are not corrected. Astigmatic, distorted surfaces potentially introduce serious degradations in optical system performance.