IMPROVED EAR-DRUMS.

Ear Spray Targeting for Improved Ear Blight and Mycotoxin Control

Since cultural measures, fungicides, and resistant cereal genotypes have provided only partial control of Fusarium head blight to date, biological control is being explored as an additional tool in the integrated management of this disease. Microbial antagonists or their metabolites are potentially useful in the disruption of spike infection, fungal spread within the spike, seedling blight deve...

Eigenfrequencies of Fractal Drums Eigenfrequencies of Fractal Drums

A method for the computation of eigenfrequencies and eigenmodes of fractal drums is presented. The approach involves first mapping the unit disk to a polygon approximating the fractal and then solving a weighted eigenvalue problem on the unit disk by a spectral collocation method. The numerical computation of the complicated conformal mapping was made feasible by the use of the fast multipole m...

Improved algorithms for ear-clipping triangulation

Eigenmodes of Isospectral Drums

Recently it was proved that there exist nonisometric planar regions that have identical Laplace spectra. That is, one cannot “hear the shape of a drum.” The simplest isospectral regions known are bounded by polygons with reentrant corners. While the isospectrality can be proven mathematically, analytical techniques are unable to produce the eigenvalues themselves. Furthermore, standard numerica...

Drums and Curve Descriptors

In this paper we present a new physically motivated curve descriptor based on the solution of Helmholtz’s equation. The descriptor satisfies the six principles set by MPEG-7: it has a good retrieval accuracy, it is compact, it can be applied in general contexts, it has a reasonable computational complexity, it is robust and provides an hierarchical representation of the curve from coarse to fin...