The angular dispersion of spatially Gaussian laser pulses, unlike for plane waves, changes with the distance between the disperser and the observer and between the beam waist and the disperser. The formula that is derived is experimentally verified by use of a high-precision measurement technique. Because the angular dispersion of a Gaussian beam is substantially different from that of a plane ...

We study the problem of approximating the quality of a disperser. A bipartite graph G on ([N ], [M ]) is a (ρN, (1 − δ)M)-disperser if for any subset S ⊆ [N ] of size ρN , the neighbor set Γ(S) contains at least (1 − δ)M distinct vertices. Our main results are strong integrality gaps in the Lasserre hierarchy and an approximation algorithm for dispersers. 1. For any α > 0, δ > 0, and a random b...

Anthropogenic habitat disturbance is a strong biodiversity change driver that compromises not only the species persistence but also the ecological interactions in which they are involved. Even though seed dispersal is a key interaction involved in the recruitment of many tree species and in consequence critical for biodiversity maintenance, studies assessing the effect of different anthropogeni...

Investigations vertebrate seed dispersal systems in the Mediterranean show that extremely efficient plant-disperser mutualisms donot require, and thus are not evidence for, mutual evolutionary adjustments of participants. Current Mediterranean dispersal systems have apparently been shaped by means of 1. trophic and behavioral daptations of birds morphologically preadapted to pre-existing plant ...

Recent theoretical work in “compressed sensing” can be exploited to guide the design of accurate, single-snapshot, static, high-throughput spectral imaging systems. A spectral imager provides a three-dimensional data cube in which the spatial information of the image is complemented by spectral information about each spatial location. In this paper, compressive, single-snapshot spectral imaging...