Although most hemangioma proliferates and
involute without functional impairment, a significant minority requires some form of intervention.
If the curve [alpha]* is an
involute of the curve a, then the distance between the curves [alpha] and [alpha]* is [lambda[(s), where [lambda](s) = |c - s|.
This equation belongs to the spherical image's
involute with respect to the base curve.
Two circular arcs, on the addendum circle and on the dedendum circle, limit an
involute tooth with asymmetrical profiles and lateral by two asymmetrical
involutes arcs and two fillet curves of the
involutes arcs with the root circle.
In one of several digressions within this account, De Quincey reminds us of an "important truth--that far more of our deepest thoughts and feelings pass to us through perplexed combinations of concrete objects, pass to us as
involutes (if I may coin that word) as compound experiences incapable of being disentangled, than ever reach us directly, and in their own abstract shapes." Such moments, which seem to collapse Freudian "dream-work" and literary production, prove irresistable to modern psychological critics.
The second form of the curve C is a curled
involutes tangent in the interior to the director circle (cylinder) (figure 3).
For instance, Kleiss Gears, based in Shoreview, Minn., recently designed an epicylic train that, in a metal version available commercially, uses pins in place of gear teeth because of the expense of shaping internal
involutes. The commercial reducer, manufactured by Tokyo-based Sumitomo Heavy Industries Ltd., is capable of reducing speed drastically within a single stage while also transmitting high power.
One of the methods to added supplementary advantages to those already known of the
involutes gears, by improving the load capacity and efficiency (Kapelevich, A.,L., 2000), (Litvin F., L.
The curve matched up with the load characteristics using
Involute to achieve smaller pressure angle in heavy load area and using quadratic curve to achieve faster opening speed in light load area.
Application of asymmetric tooth side surfaces is able to increase the load capacity and durability for the drive tooth side [1].The tooth form has left-right symmetry in the
involute cylindrical gear, and the same performance can be obtained at forward and backward rotation.
The core of the rotary scroll compressor consists of two identical meshed scrolls (
involute spirals), which form right- and left-hand components.
That dictated the use of
involute splines to optimize the tiny surfaces of the gear and spline teeth.
In the majority of cases, hemangiomas will spontaneously
involute without medical intervention, following "the 10% rule:" 50% of hemangiomas will
involute by age 5 and up to 90% by age 9 (Freeman, Shannon, Hall, & DuBiel, 1997).
