15 Greenland S. Application of stratified analysis methods. In: Rothman KJ, Greenland S (eds). Modern Epidemiology. 2nd Edn. Philadelphia: Lippincott-Raven, 1997, pp. 281–300. 16 Bartley M, Power C, Blane D, Davey Smith G, Shipley M. Birth weight and later socioeconomic disadvantage: evidence from the 1958 British cohort study. BMJ 1994;309:1475–78. 17 Burström B, Whitehead M, Lindholm C, Dider...

There is a growing body of research in Australia exploring the alcohol consumption behaviours of young people and the attendant health and social risks associated with excessive use of alcohol (Chikritzhs et al. 2003; Mancina-Pena & Tyson 2007). A number of studies from countries such as the United States and New Zealand indicate that university students tend to drink at riskier levels than the...

We propose a differential difference equation in R × Z and study it by Hirota’s bilinear method. This equation has a singular continuum limit into a system which admits the reduction to the Davey-Stewartson equation. The solutions of this discrete DS system are characterized by Casorati and Grammian determinants. Based on the bilinear form of this discrete DS system, we construct the bilinear B...

Partial orders and the clones of functions preserving them have been thoroughly studied in recent years. The topic of this papers is strict orders which are irreflexive, asymmetric and transitive subrelations of partial orders. We call an algebra A = (A,Ω) strictly order primal if for some strict order (A,<) the term functions are precisely the functions which preserve this strict order. Our ap...

The dromion of the Davey-Stewartson-1 equation is studied under perturbation on the large time. In this work we construct the asymptotic solution of the Davey-Stewart-son-1 equations (DS-1): Here ε is small positive parameter, F is operator of the perturbation, the values of the parameter σ = ±1 correspond so called focusing or defocusing DS-1 equations. The equations (1) at ε = 0 describe the ...