D-OPTIMAL EXPERIMENTAL DESIGNS FOR UNIAXIAL EXPRESSION

摘要

D-optimal designs are developed for uniaxial expression of oil from seeds, nutsrnand other materials. Both simply supported pseudo-exact and pseudo-continuousrndesigns are determined for three variations on the expression model: instantaneousrnpressure application, ramped pressure application and sine wave pressurernapplication. The results show that the designs are dependent on the magnitude ofrnthe applied pressure and, to a much lesser extent, the rate at which it is appliedrnand the manner in which it is applied. For most cases, the maximum standardizedrnvariance for the simply supported pseudo-exact designs was 1.005 or less. Thernpseudo-continuous designs were only significantly better when the maximumrnstandardized variance of the simply supported pseudo-exact designs was greaterrnthan 1.02.