We may deduce directly the orbits of rays exiting from the barrier; those falling within a cone of semiangle
95]: Precision parameter and semiangle
of the 95% confidence cone (Fisher, 1953); Plat, Plon: VGP latitude and longitude ([degrees]N, [degrees]E) in the northern hemisphere.
In Appendix A, a material with uniaxial anisotropy is modeled that has uniform K\n but with each grain having an easy axis randomly selected within the confines of a texture cone, that is, the anisotropy directions are distributed with equal probability within a cone symmetric about the z-axis with semiangle
defined by the variable phideg.
The die geometry for the production of extrudates with the combined properties of high fibril concentration, good structural integrity and auxetic behavior was found to be a die with a cone semi-angle of 45[degrees], die entrance diameter of 15 mm, exit diameter of 9-10 mm and no capillary, and of these parameters, the cone semiangle
was found to be the least significant.
Most people today are using flat-face-geometry dies with a traditional semiangle
of 90 [degrees].