The competing roles of grains and clusters in the dynamics of a driven sandpile are investigated via two models. First, we present a coupled-map lattice model of a slowly rotating sandpile: we find that our inclusion of parameters to represent grain reorganisation and inertia leads to a rich...

We investigate the structure and distribution of arches formed by spherical, hard particles shaken in an external field after they come to rest. Arches (or bridges) are formed during a computer-simulated, non-sequential deposition of the spheres after each shaking cycle. We identify these arches...

Whilst there has been much debateregarding the importance of public acceptance ofgenetic engineering and its applications, there isevidence to indicate that objections to the technologyare likely to focus on specific applications of thetechnology, rather than genetic engineering per se.Thus it...