Environmental context This special issue is a tribute to Graeme Batley’s career and his many contributions the field of environmental chemistry.

In this paper, a delayed Nicholson,s blowflies model with a linear harvesting term is investigated. Regarding the delay as a bifurcation parameter, we show that Hopf bifurcation will occur when the delay crosses a critical value. Numerical simulations supporting the theoretical findings are carried out. Keywords—Nicholson,s blowflies model; Stability; Hopf bifurcation; Delay.

This paper is concerned with the classical Nicholson-Bailey model [15] defined by fλ(x, y) = (y(1 − e−x), λye−x). We show that for λ = 1 a heteroclinic foliation exists and for λ > 1 global strict oscillations take place. The important phenomenon of delay of stability loss is established for a general class of discrete dynamical systems, and it is applied to the study of nonexistence of periodi...

8 Sternberg et al. [Sternberg, R. J., Forsythe, G. B., Hedlund, J., Horvath, J. A., Wagner, R. K., 9 Williams, W. M., Snook, S. A., Grigorenko, E. L. (2000). Practical intelligence in everyday life. New 10 York: Cambridge University Press] review the theoretical and empirical supports for their bold claim 11 that there exists a general factor of practical intelligence that is distinct from ‘‘ac...

s_an.nt.bz2 for Spanish and Aragonese, respectively. Available from https://github.com/jimregan/ es-an-sentences Table 1: Example first sentences from the Wikipedia articles “Mar”. es Un mar es una masa de agua salada de tamaño inferior al océano an A mar u o mar ye una masa d’augua salada de grandaria inferior a l’ocián A sea is a body of salt water smaller than an ocean Table 2: Example extra...

Suppose that we are given a quantum computer programmed ready to perform a computation if it is switched on. Counterfactual computation is a process by which the result of the computation may be learnt without actually running the computer. Such processes are possible within quantum physics and to achieve this effect, a computer embodying the possibility of running the computation must be avail...

Blowflies are an important parasite of the sheep industry in countries like Australia. For the purposes of prevention, control and elimination, it is of interest to investigate both temporal and spatial variations of the blowflies population using mathematical models. Based on the experimental data of Nicholson [14, 15], Gurney et al . [5] established a dynamical model, the Nicholson blowflies ...

This study applies social cognitive theory to the study of voter turnout, examining the effects of self-efficacy on citizens’ decisions of whether or not to vote. Consistent with recent arguments in cognitive psychology (Fenton-O’Creevy, Nicholson, Soane, & Willman, 2003, 2005), I argue that excessive perceptions of selfefficacy lead some citizens to overestimate their vote’s impact in close el...