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Aging: a theory based on free radical and radiation chemistry

by Denham Harman, Ph. D - J Gerontol , 1956
"... The phenomenon of growth, decline and death-aging-has been the source of consider-able speculation (1, 8, 10). This cycle seems to be a more or less direct function of the meta-bolic rate and this in turn depends on the species (animal or plant) on which are super-imposed the factors of heredity and ..."
Abstract - Cited by 637 (2 self) - Add to MetaCart
systems. In the first place, free radicals are present in living cells; this was recently demonstrated in vivo by a paramagnetic resonance absorption method (3). Further, it was shown that the concentra-tion of free radicals increased with increasing metabolic activity in conformity with the postu

2000 Resonant interactions in thermosolutal convection

by R. Moore, Nigel O. Weiss - Proc. R. Soc. Lond. A
"... When convection occurs in a nite box, successive modes become unstable as the Rayleigh number is increased, giving rise to branches of nonlinear solutions that are linked by mixed-mode branches emerging from Hopf, transcritical or pitchfork bifurcations. The fundamental mode, in particular, gives r ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
rise to resonant interactions. Several speci c examples of these generic features have already been described. Here we study resonant interactions in two-dimensional thermosolutal convection (with point symmetry imposed), where behaviour is enriched by the presence of oscillations and of subcritical

Psychophysiological and Modulatory Interactions in Neuroimaging

by K. J. Friston, C. Buechel, G. R. Fink, J. Morris, E. Rolls, R. J. Dolan , 1997
"... this paper we introduce the idea of explaining responses, in one cortical area, in terms of an interaction between the influence of another area and some experimental (sensory or task-related) parameter. We refer to these effects as psychophysiological interactions and relate them to interactions b ..."
Abstract - Cited by 376 (21 self) - Add to MetaCart
responses to the psychological or stimulusspecific factor defining the interaction. Although distinct in neurobiological terms, these are equivalent perspectives on the same underlying interaction. We illustrate these points using a functional magnetic resonance imaging study of attention t...

Harnessing resonant interactions for active control

by unknown authors
"... Direct simulations are carried out in a flow configuration devised for investigating zero-net-mass-flux (or synthetic) jet based active separation control. The numerical configuration consists of an airfoil section at zero incidence in a free-stream. A separation bubble of prescribed size is created ..."
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Direct simulations are carried out in a flow configuration devised for investigating zero-net-mass-flux (or synthetic) jet based active separation control. The numerical configuration consists of an airfoil section at zero incidence in a free-stream. A separation bubble of prescribed size is created on the top surface of the airfoil at the aft-chord location by applying blowing and suction on the top boundary of the computational domain. Such separated flows are generally characterized by three distinct time scales corresponding to the shear layer, the separation zone, and the vortex shedding in the wake; therefore the resulting flowfield can be considered as a canonical separated airfoil flow. Simulations of this flow over two different airfoil sections at a chord Reynolds number of 60, 000 subject to zero-net-mass-flux (ZNMF) perturbation of the boundary layer at different characteristic time scales are presented. Simulations of the flow over an elliptic airfoil indicate that ZNMF forcing at a frequency corresponding to the separation zone or the shear layer draws a better response as compared to excitation at the wake vortex-shedding frequency. Results also show that locating the ZNMF device at the separation point leads to a more effective separation control, whereas ZNMF forcing inside the separation bubble does not significantly alter the baseline separated flow. Results from the second set of simulations over a flat plate with elliptic leading edge and blunt trailing edge indicate that the entire system comprised of the shear layer, the separation zone, and the wake is locked on to a single frequency. 1.

On flow-acoustic resonant interactions in transitional

by Vladimir V. Golubev, Lap Nguyen, Reda R. Mankbadi, Miguel R. Visbal
"... airfoils ..."
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Resonant interactions in Bénard-Marangoni convection in cylindrical containers

by B. Echebarría, D. Krmpotić, C. Pérez-garcía , 2008
"... Convection in a cylindrical container of small aspect ratio is studied. It is known that when, in addition to buoyancy forces, thermocapillarity effects are taken into account, resonant interactions of two modes may appear. In the case of 1:2 resonance amplitude equations are derived, showing the ex ..."
Abstract - Cited by 5 (0 self) - Add to MetaCart
Convection in a cylindrical container of small aspect ratio is studied. It is known that when, in addition to buoyancy forces, thermocapillarity effects are taken into account, resonant interactions of two modes may appear. In the case of 1:2 resonance amplitude equations are derived, showing

Resonant Interactions in Rotating Homogeneous Three-dimensional Turbulence

by Qiaoning Chen, Shiyi Chen, Gregory L. Eyink, Darryl D. Holm , 2004
"... (Received?? and in revised form??) Direct numerical simulations of three-dimensional (3D) homogeneous turbulence under rapid rigid rotation are conducted to examine the predictions of resonant wave theory for both small Rossby number and large Reynolds number. The theory predicts that “slow modes ” ..."
Abstract - Cited by 8 (0 self) - Add to MetaCart
(Received?? and in revised form??) Direct numerical simulations of three-dimensional (3D) homogeneous turbulence under rapid rigid rotation are conducted to examine the predictions of resonant wave theory for both small Rossby number and large Reynolds number. The theory predicts that “slow modes

Resonant interaction of Rossby waves in two-dimensional flow on a β plane

by Michio Yamada, Tsuyoshi Yoneda
"... An incompressible two-dimensional flow on a β plane is considered. Rossby waves are generally expected to dominate the β plane dynamics, and here in this paper we prove a mathematically rigorous theorem that at a high β, the flow dynamics are governed exclusively by the resonant interactions of Ross ..."
Abstract - Cited by 2 (1 self) - Add to MetaCart
An incompressible two-dimensional flow on a β plane is considered. Rossby waves are generally expected to dominate the β plane dynamics, and here in this paper we prove a mathematically rigorous theorem that at a high β, the flow dynamics are governed exclusively by the resonant interactions

The Three-Wave Resonant Interaction: Deformation of the Plane Wave Solutions and Darboux Transformations

by Francisco Guil, Manuel Mañas , 1996
"... The plane wave solutions of the three-wave resonant interaction in the plane are considered. It is shown that rank-one constraints over the right derivatives of invertible operators on an arbitrary linear space gives solutions of the three-wave resonant interaction that can be understood as a Darbou ..."
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The plane wave solutions of the three-wave resonant interaction in the plane are considered. It is shown that rank-one constraints over the right derivatives of invertible operators on an arbitrary linear space gives solutions of the three-wave resonant interaction that can be understood as a

Rational solitons of wave resonant interaction models, Phys

by Antonio Degasperis, Sara Lombardo - Rev. E
"... ar ..."
Abstract - Cited by 4 (0 self) - Add to MetaCart
Abstract not found
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