The Schelling model of neighbourhood racial segregation is extended to include agents who can authentically 'see' their neighbours up to a distance R, called 'vision'. By exploring the consequences of systematically varying R, an understanding has been developed of how vision interacts with racial preferences and minority concentrations and leads to novel, complex segregation behaviour. Three regimes have been discovered: an unstable regime, where societies invariably segregate; a stable regime, where integrated societies remain stable; and an intermediate regime where a complex behaviour is observed. Detailed results are presented for the symmetrical case (which maximises conflict), where equal numbers of agents of two races occupy the same cityscape. The policy implications of these simulations are briefly indicated.
We present a description of electrorheological fluids in terms of an electric field induced phase transition at a critical electric field Ec. Theoretically, we find that as the applied field exceeds Ec, the osmotic pressure becomes negative and the liquid experiences a phase transition to a solid phase. Ec is experimentally determined as a function of concentration in one system. Our theoretically predicted phase diagram is in reasonable agreement with our experimental data.
The observed increase of superconducting transition temperature (T(c)) with the number of copper oxide planes continues in the four-[CuO(2)](-2) layer (single TI layer) oxide superconductor, which has been prepared with > 80% purity and was magnetically aligned for crystallographic identification. A master scaling curve is proposed, which ties together the T(c)'s of virtually all known Bi and Tl oxide superconductors, and shows that the Tl(Bi) layers play an essential role in the superconductivity. publication 350 of the Barnett Institute.
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