symmetrical fold

symmetrical fold

[sə′me·trə·kəl ′fōld]
(geology)
A fold whose limbs have approximately the same angle of dip relative to the axial surface. Also known as normal fold.
References in classic literature ?
Drawing across her bow, he perceived that in accordance with the fanciful French taste, the upper part of her stem-piece was carved in the likeness of a huge drooping stalk, was painted green, and for thorns had copper spikes projecting from it here and there; the whole terminating in a symmetrical folded bulb of a bright red color.
Small bowel follow through showed multiple well defined, round, small filling defects all over the jejunum and granularity of the mucosa along the ileum, with symmetrical fold pattern (Figure 3).
The satellite imagery combined with 2D seismic images portray a compressional structural geometry of the area indicating a combination of mostly symmetrical folds, probably overturned at places, and reverse faults.
Because of some advantages of symmetrical structure, the pattern reconfigurable antenna with symmetry feature has been studied a lot, such as a beam reconfigurable antenna based on a symmetrical folded dipole structure, a wideband pattern reconfigurable antenna with symmetrical switchable feed structure [4], a reconfigurable patch antenna with symmetrical slotted parasite radiator [5], a reconfigurable microstrip antenna with symmetrical slotted parasite array, a reconfigurable rectangular patch antenna with symmetrical parasite folded dipole, etc.

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