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Biomimicry of crowd evacuation with a slime mould cellular automaton model (2015)
Journal Article
Adamatzky, A. I., Sirakoulis, G. C., Georgilas, I. P., Papadopoulos, D. P., Kalogeiton, V. S., Kalogeiton, V., …Adamatzky, A. (2015). Biomimicry of crowd evacuation with a slime mould cellular automaton model. Studies in Computational Intelligence, 600, 123-151. https://doi.org/10.1007/978-3-319-16844-9_7

© Springer International Publishing Switzerland 2015. Evacuation is an imminent movement of people away from sources of danger. Evacuation in highly structured environments, e.g. building, requires advance planning and large-scale control. Finding a... Read More about Biomimicry of crowd evacuation with a slime mould cellular automaton model.

Flexible time and ether in one-dimensional cellular automata (2013)
Thesis
Redeker, M. Flexible time and ether in one-dimensional cellular automata. (Thesis). University of the West of England

A one-dimensional cellular automaton is an infinite row of identical machines---the cells---which depend for their behaviour only on the states of their direct neighbours. This thesis introduces a new way to think about one-dimensional cellular au... Read More about Flexible time and ether in one-dimensional cellular automata.

Non-existence of local solutions for semilinear heat equations of Osgood type (2013)
Journal Article
Sierz;E;ga, M., Robinson, J. C., Laister, R., Robinson, J. C., & Sierzega, M. (2013). Non-existence of local solutions for semilinear heat equations of Osgood type. Journal of Differential Equations, 255(10), 3020-3028. https://doi.org/10.1016/j.jde.2013.07.007

We establish non-existence results for the Cauchy problem of some semilinear heat equations with non-negative initial data and locally Lipschitz, non-negative source term f. Global (in time) solutions of the scalar ODE v;=f(v) exist for v(0)>0 if and... Read More about Non-existence of local solutions for semilinear heat equations of Osgood type.

Gaussian lower bounds on the Dirichlet heat kernel and non-existence of local solutions for semilinear heat equations of Osgood type (2013)
Journal Article
Laister, R., Robinson, J. C., & Sierzega, M. (2013). Gaussian lower bounds on the Dirichlet heat kernel and non-existence of local solutions for semilinear heat equations of Osgood type

We give a simple proof of a lower bound for the Dirichlet heat kernel in terms of the Gaussian heat kernel. Using this we establish a non-existence result for semilinear heat equations with zero Dirichlet boundary conditions and initial data in $L^q... Read More about Gaussian lower bounds on the Dirichlet heat kernel and non-existence of local solutions for semilinear heat equations of Osgood type.

Convergence to equilibrium in degenerate parabolic equations with delay (2013)
Journal Article
Laister, R., & Laister, R. (2013). Convergence to equilibrium in degenerate parabolic equations with delay. Nonlinear Analysis: Theory, Methods and Applications, 81, 200-210. https://doi.org/10.1016/j.na.2012.10.019

© 2012 Elsevier Ltd In [11], Busenberg & Huang (1996) showed that small positive equilibria can undergo supercritical Hopf bifurcation in a delay-logistic reaction–diffusion equation with Dirichlet boundary conditions. Consequently, stable spatially... Read More about Convergence to equilibrium in degenerate parabolic equations with delay.

Volatile organic compounds from feces and their potential for diagnosis of gastrointestinal disease (2007)
Journal Article
Garner, C. E., Smith, S., De Lacy Costello, B., White, P., Spencer, R., Probert, C. S., & Ratcliffe, N. M. (2007). Volatile organic compounds from feces and their potential for diagnosis of gastrointestinal disease. FASEB Journal, 21(8), 1675-1688. https://doi.org/10.1096/fj.06-6927com

Little is known about the volatile organic compounds (VOCs) in feces and their potential health consequences. Patients and healthcare professionals have observed that feces often smell abnormal during gastrointestinal disease. The aim of this work wa... Read More about Volatile organic compounds from feces and their potential for diagnosis of gastrointestinal disease.

Sequential and continuum bifurcations in degenerate elliptic equations (2004)
Journal Article
Laister, R., Beardmore, R. E., & Laister, R. (2004). Sequential and continuum bifurcations in degenerate elliptic equations. Proceedings of the American Mathematical Society, 132(01), 165-174. https://doi.org/10.1090/S0002-9939-03-06979-X

We examine the bifurcations to positive and sign-changing solutions of degenerate elliptic equations. In the problems we study, which do not represent Fredholm operators, we show that there is a critical parameter value at which an infinity of bifurc... Read More about Sequential and continuum bifurcations in degenerate elliptic equations.

Finite time extinction in nonlinear diffusion equations (2004)
Journal Article
Beardmore, R. E., Peplow, A. T., & Laister, R. (2004). Finite time extinction in nonlinear diffusion equations. Applied Mathematics Letters, 17(5), 561-567. https://doi.org/10.1016/S0893-9659%2804%2990126-7

We consider a class of degenerate diffusion equations where the nonlinearity is assumed to be singular (non-Lipschitz) at zero. It is shown that solutions with compactly supported initial data become identically zero in finite time. Such extinction f... Read More about Finite time extinction in nonlinear diffusion equations.

Trajectories of a DAE near a pseudo-equilibrium (2004)
Journal Article
Laister, R., Beardmore, R. E., Laister, R., & Peplow, A. (2004). Trajectories of a DAE near a pseudo-equilibrium. Nonlinearity, 17(1), 253-279. https://doi.org/10.1088/0951-7715/17/1/015

We consider a class of differential-algebraic equations (DAEs) defined by analytic nonlinearities and study its singular solutions. The main assumption used is that the linearization of the DAE represents a Kronecker index-2 matrix pencil and that th... Read More about Trajectories of a DAE near a pseudo-equilibrium.

The flow of a DAE near a singular equilibrium (2003)
Journal Article
Laister, R., Beardmore, R. E., & Laister, R. (2003). The flow of a DAE near a singular equilibrium. SIAM Journal on Matrix Analysis and Applications, 24(1), 106-120. https://doi.org/10.1137/S0895479800378660

We extend the differential-algebraic equation (DAE) taxonomy by assuming that the linearization of a DAE about a singular equilibrium has a particular index-2 Kronecker normal form. A Lyapunov-Schmidt procedure is used to reduce the DAE to a quasilin... Read More about The flow of a DAE near a singular equilibrium.

Transversality and separation of zeros in second order differential equations (2003)
Journal Article
Laister, R., Laister, R., & Beardmore, R. E. (2003). Transversality and separation of zeros in second order differential equations. Proceedings of the American Mathematical Society, 131(1), 209-218. https://doi.org/10.1090/S0002-9939-02-06546-2

Sufficient conditions on the non-linearity f are given which ensure that non-trivial solutions of second order differential equations of the form Lu = f(t, u) have a finite number of transverse zeros in a given finite time interval. We also obtain a... Read More about Transversality and separation of zeros in second order differential equations.

Instability of equilibria in some delay reaction-diffusion systems (2000)
Journal Article
Laister, R. (2000). Instability of equilibria in some delay reaction-diffusion systems. Journal of Mathematical Analysis and Applications, 247(2), 588-607. https://doi.org/10.1006/jmaa.2000.6883

A new result is derived which extends a known instability result for a class of reaction-diffusion equations to a corresponding system incorporating time delay effects. For a significant class of nonlinear equations it is shown that an unstable equil... Read More about Instability of equilibria in some delay reaction-diffusion systems.