The overall distribution of wintering sandhill cranes in Mexico has been reported and summarized in several prior documents. However, most reports are associated with counts or surveys primarily conducted for wintering waterfowl. Recent (19992002) reports compiled from local researchers show, that wintering sandhill cranes are distributed much more widely in northern Mexico than is currently re...

COVER Young whooping cranes (Grus americana) follow an ultralight aircraft. Each year, endangered whooping cranes are reared in captivity and artifi cially trained by ultralight aircraft on their fi rst lifetime migration from Wisconsin to Florida. Analyses of data from subsequent unaided migration events show that migratory performance improves over many years and that social learning from old...

In this work, we examine port crane scheduling with spatial and separation constraints. Although common to most port operations, these constraints have not been previously studied. We assume that cranes cannot cross, there is a minimum distance between cranes and jobs cannot be done simultaneously. The objective is to find a crane-to-job matching which maximizes throughput under these constrain...

KvYr, E. 1976. Whooping Cranes: The long road back. Nature Canada 5(2):2-8. KvYr, E. 1981a. Clutch size, hatch success, and survival of Whooping Crane chicks, Wood Buffalo National Park, Canada. Pages 126-129 in Crane research around the world (J. C. Lewis and H. Masatomi, Eds.). International Crane Foundation, Baraboo, Wisconsin. KvYr, E. 1981b. Population status, nest fidelity, and breeding h...

This paper summarizes the most important advances of the used crane control technology in perspective of automatic operation of container cranes. Faster and more productive container cranes demands highly efficient yard system. Storage capacity is the limitation for most terminals today; automatic operation offers optimum stacking density and peak capacity equivalent for continuous manning of e...

Intelligent Systems Division, National Institute of Standards and Technology, Gaithersburg, Md. 20899. The National Institute of Standards and Technology (NIST) has developed conceptual designs, laboratory scale models, and computer simulations/animation of several configurations of remotely operated cranes to assemble highway bridges. NIST’s designs have been patented and trademarked as “RoboC...

The quay crane scheduling problem consists of determining a sequence of unloading and loading movements for cranes assigned to a vessel, in order to minimize the vessel completion time as well as the crane idle times. Idle times originate from interferences between cranes since these roll on the same rails and a minimum safety distance must be maintained between them. The productivity of contai...

The study of memory for event duration in pigeons has, for the most part, centered on an unusual behavioral phenomenon and an interesting theoretical explanation for it. A typical experiment on memory for event duration involves trials initiated by a sample stimulus that is either short or long in duration (e.g., 2 vs. 10 sec of houselight) and that is later followed by the simultaneous present...