spiral


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spiral

 [spi´ral]
1. winding like the thread of a screw; called also helical.
2. a winding structure; see also coil and helix.
Curschmann's s's coiled fibrils of mucin sometimes found in the sputum of patients with asthma. See also Laënnec's pearls.

spi·ral

(spī'răl),
1. Coiled; winding around a center like a watch spring; winding and ascending like a wire spring.
2. A structure in the shape of a coil.
[Mediev. L. spiralis, fr. G. speira, a coil]

spi·ral

(spī'răl)
1. Coiled; winding around a center like a watch spring; winding and ascending like a wire spring.
2. A structure in the shape of a coil.
[Mediev. L. spiralis, fr. G. speira, a coil]

spi·ral

(spī'răl)
1. Coiled; winding around a center like a watch spring; winding and ascending like a wire spring.
2. Structure in shape of a coil.
[Mediev. L. spiralis, fr. G. speira, a coil]
References in periodicals archive ?
The input impedance of spiral antenna can be evaluated by the parallel impedance of [Z.sub.0].
The antenna is mainly composed of a single spiral arm, an FR4 board, a disc, and a coaxial pin.
In this paper, we contribute to the design of the controller to make the UAV recover from spiral autonomously.
where: Lax is the spiral axial length mm, Lele is the length of the spiral arms mm, r0 is the radius of the spiralmm, N is the number of turns of the spiral.
As shown in Figure 3, the spiral heat source model is further developed here with increasing accuracy and sophistication to take the three-dimensional geometrical characteristic of the spiral pile into account and to describe the actual heat transfer process of the novel pile GHE.
Previous studies suggested that these structures decay over time, transforming the barred spiral galaxy to a more regular spiral one.
We believe that The Spiral will help us to achieve a workplace that is equipped with collaborative tools, flexible open spaces, and state of the art staff amenities and innovative technology, all of which will help us to best serve our clients.
Section 2 presents the detailed design flow, starting from the design guidelines and utilization of performance enhancement techniques, leading to modelling and fabrication of the spiral antenna.
The decision to replace the existing spirals was taken by the chrome producer following extensive testwork performed by both Northam and Multotec.
Eastern Sheet Metal is the industry leader that provides custom-designed, AMCA certified spiral duct systems.
Basic Spiral is the simplest spiraling design, formed by randomly stitching open spirals in rows throughout your quilting space.
The Oak Infusion Spiral is a patented oak-aging alternative originally developed for fine wine, but has been used for whiskey, rum, tequila and beer to mimic the effects of aging in an oak barrel.