We attempt to describe the stress distributions of granular packings using lattice-based layer-by-layer stochastic models that satisfy the constraints of force and torque balance and nontensile forces at each site. The inherent asymmetry in the layer-by-layer approach appears to lead to an asymmetric force distribution, in disagreement with both experiments and general symmetry considerations. ...

As graph representations of data emerge in multiple domains, data analysts need to be able to select among a magnitude of di‚erent graph inputs based on the effects they induce when a variety of operators are applied to them. Exhaustive execution of an operator over the bulk of the available data sources is impractical due to the massive resources it requires. Additionally, the same process wou...

We describe a technique for interactive rendering of diffraction effects produced by biological nanostructures, such as snake skin surface gratings. Our approach uses imagery from atomic force microscopy that accurately captures the geometry of the nanostructures responsible for structural colouration, that is, colouration due to wave interference, in a variety of animals. We develop a renderin...

The problem of establishing a mutually held secret cryptographic key using a radio channel is addressed. The performance of a particular key distribution system is evaluated for a practical mobile radio communications system. The performance measure taken is probabilistic, and different from the Shannonmeasure of perfect secrecy. In particular, it is shown that by using a channel decoder, the p...

We have studied the X R and B P states of LiRb using Laser Induced Fluorescence (LIF) Spectroscopy and Fluorescence Excitation Spectroscopy (FES). We extract molecular constants for levels v00 = 0–2 of the X R state and levels v0 = 0–20 of the B P state. For the B P state, we have observed rotational perturbations in the e-parity component of the v0 = 2 level, and determined the dissociation en...