helicoid


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Related to helicoid: Catenoid, helicoid cyme

helicoid

[′hel·ə‚kȯid]
(invertebrate zoology)
Of a gastropod shell, shaped like a flat coil or flattened spiral.
(mathematics)
A surface generated by a curve which is rotated about a straight line and also is translated in the direction of the line at a rate that is a constant multiple of its rate of rotation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
For the first arrangement, acoustic propagation is such that flow is possible through the mid-section and around the spaces after sudden expansion at the entry to the chamber defined by the helicoid within the SEC and later joining the main stream due to contraction at the end of the expansion chamber.
The helicoid instanton is a double-centered solution.
For right-directional helicoid, the positive sign in front of P[tau] needs to be changed to negative sign.
Three minimal surfaces that will arise in this paper are the helicoid, wavy plane, and Enneper's surface.
The innocence of childhood lost, as in the previous quote, resonates with the reference of recently buried young, cadavers metaphorically described as "vasija de sexos adolescentes sin abrir" (189) or of a boy who was playing with his toy horse one moment and then after the detonation of a bomb's helicoid fuse, (2) becomes reduced to "pedazos de nino explotado" (208), the ultimate form of dismemberment that alludes to a borderline nothingness.
Generally speaking, it stands for a minimal energy state, and since such "minimal surfaces" are especially important in physics and chemistry, la chainette and the surface it generates when rotated turn up all over, as the catenoid of a soap bubble stretched between two loops or of the lipid bilayer in cell membranes; another such minimal surface is the helicoid of DNA.
* calibrated VTA adjustment helicoid deep-thread technology similar to camera focus rings with lock
(2000), Intelligent Manufacturing System for Production of Helicoid Surfaces, Gep, Vol.
Mathematicians can also imagine twisting that plane to produce another infinite shape called the helicoid. Also a minimal surface, it looks like a pair of intertwined spiral slides--a double helix--at its core and it stretches away to infinity as a stack of sheets.
pora, with a slightly helicoidal end, might represent an intermediate condition between the marked helicoid in the bonariensis group and the straight condition of all remaining Bothriurus species (Mattoni 2003).
The historical appearance of the "helicoid" in the 1690s (119) is both the analogue and the enabling condition for Hegel's paradigm, its formal design and its historical precursor: history in form and as form--a form far more bewildering than the ones we are used to, and perhaps finally a mathematical construct not even open to conventional visualization.