Ground state of the bond-random antiferromagnetic S = 1 Heisenberg chain with the biquadratic interaction −β ∑ i(Si · Si+1) 2 is investigated by means of the exact-diagonalization method and the finite-size-scaling analysis. It is shown that the Haldane phase β ≈ 0 persists against the randomness; namely, no randomness-driven phase transition is observed until at a point of extremelybroad-bond ...

We propose the model of layered materials, in which each layer is described by conventional Haldane model, while inter-layer hopping parameter corresponds to ABC stacking. calculate topological invariant N3 for resulting responsible conductivity intrinsic quantum Hall effect. It has been shown that a finite value interlayer parameter, equal number layers multiplied layer. At same time this may ...

The global asymptotic behavior of solutions of the variable yield model is determined. The model generalizes the classical Monod model and it assumes that the yield is an increasing function of the nutrient concentration. In contrast to the Monod model, it is demonstrated that the variable yield model exhibits sustained oscillations. Moreover, it is shown that the variable yield model may under...

When venous oxygen saturation increases as a result of increased blood flow, changes in venous blood PCO2 and carbon dioxide content may differ because of the Haldane effect. The Haldane effect may also explain increases in gastric mucosal-arterial PCO2 gradient despite major increases in splanchnic blood flow. We re-analysed data from 22 patients after cardiac surgery who were randomized to re...

In my paper (Mingers 2004) I put forward the case that the philosophical position known as critical realism could potentially provide a sound underpinning for information systems. This issue of Information and Organization contains two papers written in response to mine (Klein 2004; Monod 2004) and the editors have allowed me to make a very brief reply. Published in Information and Organization...