annulus

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annulus

[′an·yə·ləs]
(anatomy)
Any ringlike anatomical part.
(botany)
An elastic ring of cells between the operculum and the mouth of the capsule in mosses.
A line of cells, partly or entirely surrounding the sporangium in ferns, which constricts, thus causing rupture of the sporangium to release spores.
A whorl resembling a calyx at the base of the strobilus in certain horsetails.
(mathematics)
The ringlike figure that lies between two concentric circles.
(mycology)
A ring of tissue representing the remnant of the veil around the stipe of some agarics.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
where [T.sub.p,2] is the temperature of the external surface of the outer pipe; [T.sub.0] is the borehole wall temperature; [r.sub.o,2] is the external radius of the outer pipe; [r.sub.b] is the borehole radius; [[rho].sub.grout], [c.sub.grout], and [[lambda].sub.grout] are the density, specific heat, and thermal conductivity of the grout, respectively; T (j, 1) is the ground temperature for the jth slice and the first annular region (i.e., the one adjacent to the grout); and R (j,0) is the thermal resistance between the grout and the first annular region of the ground.
As also shown in the figure, the area under each palm was divided into 5 notional annular regions. These had outer radii of 1.45, 2.34, 3.23, 4.12, and 5.08 m, with respective areas of 6.1, 10.6, 15.6, 20.5, and 27.7 [m.sup.2] and thus covered a total area of 80.5 [m.sup.2], not including the trunk (0.5 [m.sup.2]).
The data show a dense annular region surrounding a more dilute core region for both FCC and fluid coke particles.
The annular region between the pipe and the borehole should be filled with drilling mud to minimize the frictional loads on the pipe during pull back.
Similarly, the ratio of material flowing through the annular region can also be solved, resulting in,
After finding the center the image was divided into 22 equal width annular regions. Pixels were counted in each annulus to compute normalized pixel densities for each annulus.