Manufacturing flow line systems: a review of models and analytical results

The most important models and results of the manufacturing flow line literature are described. These include the major classes of models (asynchronous, synchronous, and continuous); the major features (blocking, processing times, failures and repairs); the major properties (conservation of flow, flow rate-idle time, reversibility, and others); and the relationships among different models. Exact and approximate methods for obtaining quantitative measures of performance are also reviewed. The exact methods are appropriate for small systems. The approximate methods, which are the only means available for large systems, are generally based on decomposition, and make use of the exact methods for small systems. Extensions are briefly discussed. Directions for future research are suggested.National Science Foundation (U.S.) (Grant DDM-8914277

Eustomias eximius Jordan & Gilbert, 1925 (Pisces): arequest for suppression of a neotype following rediscovery of holotype. Z.N. (S.) 1964

Volume: 28Start Page: 164End Page: 16

Feeding Ecology of the Dark-Rumped Petrel in the Galápagos Islands

During a study of Dark-romped Petrel (Pterodroma phaeopygia) breeding biology in the Galapagos Islands, we collected over 80 samples of food regurgitated by petrel chicks. We identified the prey to the lowest possible taxonomic level and determined the relative importance of each food class in the petrel's diet. We also monitored the daily changes in mass of 14 chicks on Floreana Island to determine the quantity of food delivered as well as the food delivery rate. Dark-romped Petrel hatchlings were fed a mixture of stomach oils, semi-digested fish, cephalopods and crustaceans. On the basis of mass composition, about 46% of the diet was cephalopods, about 37% fish, and about 17% crustaceans. Cephalopods, of at least 16 families, occurred with the greatest regularity. Fish were present in the samples more frequently than Crustacea: seven and five families, respectively. Feeding rates were highest in the month after hatching and lowest before fledging. Estimated food loads averaged 68 g and did not increase in size over the growth period. Dark-romped Petrels fed on mainly mesopelagic prey, taken presumably at night, while ranging up to 2,000 km from the colonies, largely southwards