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Optimization under frequency-dependent selection
Theoretical Population Biology, 2009We consider a model of frequency-dependent selection, which we refer to as the Wildcard Model. A variety of more specific models, representing quite diverse biological situations, are covered by the Wildcard Model as particular cases. Two very different particular models that are subsumed by the Wildcard Model are the game theoretically motivated two ...
Matessi, Carlo, Schneider, Kristan
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Orientation discrimination depends on spatial frequency
Vision Research, 1991Thresholds were measured for discriminating the orientation of sinusoidal gratings of varying spatial frequency, and found to decrease monotonically with increasing spatial frequency. For discrimination of high-contrast (10 times threshold) near-vertical gratings, thresholds ranged from about 1 deg at 0.04 c/deg to 0.5 deg at 0.2 c/deg, after which ...
BURR, DAVID CHARLES, S. A. WIJESUNDRA
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Frequency-dependent selection by predators
Philosophical Transactions of the Royal Society of London. B, Biological Sciences, 1988Abstract Sometimes predators tend to concentrate on common varieties of prey and overlook rare ones. Within prey species, this could result in the fitness of each variety being inversely related to its frequency in the population.
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Local Frequency Dependence and Global Coexistence
Theoretical Population Biology, 1999In sessile organisms such as plants, interactions occur locally so that important ecological aspects like frequency dependence are manifest within local neighborhoods. Using probabilistic cellular automata models, we investigated how local frequency-dependent competition influenced whether two species could coexist.
Molofsky, Jane +4 more
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Frequency Dependence of Induced Currentsâ€
Journal of Electronics and Control, 1961Attempts to solve Maxwell's equations for regions inside electrical conductors generally meet with insuperable mathematical obstacles, unless a uniform magnetic field can be assumed to exist. In many practical instances the field will be non-uniform, since it is generated by currents flowing along wires.
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Frequency-Dependent Acoustics of Composites with Interfaces
SIAM Journal on Applied Mathematics, 2000It is a very interesting paper, studying the transmission and reflection properties of acoustic transducer, the active part being a composite piezoelectric. A coupled problem for the Helmholtz equation is studied in the two halfspaces and the transmission condition is considered on the interface.
J. F. Clouet +2 more
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On frequency-dependent and time-dependent diffusivities
European Journal of Physics, 1992The time-dependent diffusivity D(t) is usually defined as the coefficient that appears in the diffusion equation, while the frequency-dependent diffusivity D( omega ) is defined the Fourier transform of the velocity-velocity correlation function. D( omega )/(i omega ), rather than D( omega ), is the Fourier transform of D(t).
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The Frequency-Dependent Behavior of Cerebral Autoregulation
Neurosurgery, 1990Abstract Cerebral autoregulation is a complex physiological process composed of both fast and slow components that may respond differently to different rates and patterns of blood pressure variation. To assess the temporal nature of autoregulation, transcranial Doppler velocity recordings of the middle cerebral artery obtained over ...
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Presynaptic Frequency- and Pattern-Dependent Filtering
Journal of Computational Neuroscience, 2003Dual intracellular recordings from pairs of synaptically connected neurones have demonstrated that the frequency-dependent pattern of transmitter release varies dramatically between different classes of connections. Somewhat surprisingly, these patterns are not determined by the class of neurone supplying the axon alone, but to a large degree by the ...
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Evaluation of inter-unit dependency effect on site core damage frequency: Internal and seismic event
Reliability Engineering and System Safety, 2022Moosung Jae, Yongjin Kim
exaly