Reflection on past achievements and future challenges 10 years after the establishment of the Australian General Practice Training program.

Magnetic excitations in the quasi-one-dimensional antiferromagnet IPA-CuCl3 are studied by cold neutron inelastic scattering. Strongly dispersive gap excitations are observed. Contrary to previously proposed models, the system is best described as an asymmetric quantum spin ladder. The observed spectrum is interpreted in terms of composite Haldane spin chains. The key difference from actual S=1...

Complex dynamics of the most frequently used tritrophic food chain model are investigated in this paper. First it is shown that the model admits a sequence of pairs of Belyakov bifurcations (codimension-two homoclinic orbits to a critical node). Then fold and period-doubling cycle bifurcation curves associated to each pair of Belyakov points are computed and analyzed. The overall bifurcation sc...

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a Department of Family Practice, Virginia Commonwealth University, Fairfax, Virginia 22033, USA, b Center for Quality of Care Research, University of Nijmegen, PO Box 9101, 6500 HB Nijmegen, Netherlands, c School of Health and Related Research, University of Sheffield, Sheffield S1 4DA, d Centre for Health Services Research, University of Newcastle upon Tyne, Newcastle upon Tyne NE2 4AA, e Heal...

Abstract. This paper aims to study the effect of time-delay on a tritrophic food chain model with Michaelis-Menten type ratio-dependent functional responses. Boundedness of the time-delayed system is established. A simple criterion for deterministic extinction is derived. It has been shown that the time-delay may introduce instability in the system through Hopf bifurcation. Computer simulations...