Kember, Guy
Permanent URI for this collectionhttps://hdl.handle.net/10222/44379
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Item Open Access The Lorenz-Krishnamurthy slow manifold(1996-05/15) Fowler, A. C.; Kember, G.The authors scale the five-mode model introduced by Lorenz and Krishnamurthy and show how explicit solutions may be obtained in the limit of small Rossby number by using the method of multiple scales. They thus obtain a characterization of the “slow manifold†of this model. Reprinted by permission of the publisher.Item Open Access "Smart" baroreception along the aortic arch, with reference to essential hypertension(American Physical Society, 2004) Kember, G. C.; Zamir, M.; Armour, J. A.An arterial model was used to show that the cumulative effects of wave reflections have a surprisingly pronounced effect on the pressure distribution in the root segment of the tree. Global arterial conditions play a role in cardiac control and this provides a physiological motivation for smart baroreceptor. Distortions of the aortic wall are mainly due to left ventrical output and to reflected waves arising from the arterial tree. The results reveal that smart baroreception strongly depends upon arterial tree properties such as elasticity and geometry.Item Open Access Competition model for aperiodic stochastic resonance in a Fitzhugh-Nagumo model of cardiac sensory neurons(American Institute of Physics Inc, 2001) Kember, G. C.; Fenton, G. A.; Armour, J. A.; Kalyaniwalla, N.A model is presented to access the cause and effect between noisy threshold inputs and the average firing rate generated by neuron. The neural control in the heart in aperiodic stochastic resonance (ASR) was partially exerted using subthreshold inputs amplified by noisy fluctuations. The result exhibited a reduction in correlation measures with the lowering of firing rate.Item Open Access Mechanism of smart baroreception in the aortic arch(American Physical Society, 2006) Kember, G. C.; Armour, J. A.; Zamir, M.A mechanism is proposed by which the patch of baroreceptors along the inner curvature of the arch of the aorta can sense hemodynamic events occurring downstream from the aortic arch, in the periphery of the arterial tree. Based on a solution of equations governing the elastic movements of the aortic wall, it is shown that the pressure distribution along the patch of baroreceptors has the same functional form as the distribution of strain along the patch. The significance of these findings are discussed, particularly as they relate to the possibility of a neuromechanical basis of essential hypertension. 2006 The American Physical Society.Item Open Access Control of cardiac function and noise from a decaying power spectrum(American Physical Society, 2004) Kember, G. C.; Armour, J. A.; Fenton, G. A.; Malhotra, A.The transduction capability of cardiac affected neurons situated to the heart to control cardiac function was described. It was observed that the through in situ cardiac afferent activity shows evidence of independent and exponentially distributed interspike intervals. The feedback of heart status to the entire cardiac neuronal hierarchy was derived from the cardiac afferent neurons with sensory neurite fields in various regions of th heart and major intrathoracic vessels. It was observed that in neurally beased cardiac therapy the electrical stimulation of the dorsal columns of the thoracic spinal cord relieves symptoms associated with myocardial ischemia.Item Open Access Guy Kember's CV(2014-02-14) Kember, Guy