The critical problem of airspace congestion over Europe is currently being handled by the Air Traffic Flow Management (ATFM) by allocating departure time slots to aircraft, thus generating costly ground delays. Besides, airlines operators are free to choose the flight path through the routes network, and the requested flight level for each of their flights3. Very few constraints are put on the ...

In this paper, we propose an approach to autonomously control a quadrotor micro aerial vehicle (MAV). With take-off weight of 50 g and 8-min flight endurance, the MAV platform codenamed ‘KayLion’ developed by the National University of Singapore (NUS) is able to perform autonomous flight with pre-planned path tracking. The vision-based autonomous control is realized with a light weight camera s...

By setting out arrays of potted plants of Penstemon strictus, I tested whether freely foraging bumblebee (Bombus spp.) workers would establish regular foraging routes that reflected the geometry of the array. They did, passing through an asymmetrical array in a pattern that minimized interplant flight distances. After the array was changed to a symmetrical pattern, however, the experienced bees...

The significant difference in the ultrasonic velocity of liquid and solid semiconductors has led to an interest in ultrasonic characterization of anisotropic solid-liquid interfaces during semiconductor single-crystal growth. However, the large solid:liquid velocity ratio could result in potentially severe ray bending at the interface and so detailed ray path and wavefront analyses are needed b...

2. Derive from the Lorentz transformation equations an expression for the mean life measured in the laboratory of unstable particles of a given kind traveling with kinetic energy K if their rest mass is m0 and their mean life at rest is τ0 . Assuming that the most likely momentum for the muon is approximately 1GeV/c (see Appendix C), calculate β, γ and the flight time for a trip of 3 meters (ap...