A significant source of uncertainty in biodiesel production is the variability of feed composition since the percentage and type of triglycerides varies considerably across different raw materials. Also, due to the complexity of both transesterification and saponification kinetics, first-principles models of biodiesel production typically have built-in errors (structural and parametric uncertainty) which give rise to the need for obtaining relevant data through experimental design in modeling for optimization. A run-to-run optimization strategy which integrates tendency models with Bayesian active learning is proposed. Parameter distributions in a probabilistic model of process performance are re-estimated using data from experiments designed for maximizing information and performance. Results obtained highlight that Bayesian optimal design of experiments using a probabilistic tendency model is effective in achieving the maximum ester content and yield in biodiesel production even though significant uncertainty in feed composition and modeling errors are present.
In Green Light! Martin Wolfe gives us the big picture of World War II airborne warfare in Europe through the lens of one unit, a squadron typical of some sixty others. Troop carrier squadrons delivered paratroopers behind enemy lines, tugged gliders into battle zones, and, between combat operations, freighted up to the front everything from food to artillery shells and carried back wounded infantrymen and newly freed slave laborers. Wolfe's firsthand account is an engaging and informative narrative that goes beyond the facts to investigate the feelings of the tightly knit unit. He also describes the management and training techniques that prepared the squadron for its role in four of the five main invasions of Nazi Europe. In all the literature about World War II , this is the first account to show how all levels of a squadron functioned-clerks as well as pilots, maintenance mechanics as well as flying crew chiefs, the mess hall as well as headquarters. In addition, Wolfe's is the first book to show the interplay between unit experience and high command theory—what units like the 81st Troop Carrier Squadron could actually accomplish and how concepts of airborne warfare changed at Supreme Headquarters. He explains why and how it was not until the last airborne invasion, in March 1945, that the full potential of the troop carrier was reached. Wolfe melds the recollections of ninety veterans of this squadron with a general history of Allied airborne forces in World War II. Through their words, Green Light! paints vivid portraits of the real men of the war, not the Rambos or Sad Sacks of popular culture. And through the retelling of their experiences, the book shows that the truism "war is hell" does not hold for all soldiers all the time.
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