Results 221 to 230 of about 135,779 (266)

Frequency‐dependent tree growth depends on climate

Ecology, 2021
AbstractClimate and competition interact to affect species’ performance, such as growth and survival, and help determine species distributions and coexistence. However, it is unclear how climatic conditions modulate frequency‐dependent performance, that is, how performance changes as a species becomes locally rare or common.
Jeffrey M. Diez, Rohan Boone, Teresa Bohner, Oscar Godoy   +3 more
openaire   +2 more sources

The dependency of timbre on fundamental frequency [PDF]

Journal of the Acoustical Society of America, 2003
The dependency of the timbre of musical sounds on their fundamental frequency (F0) was examined in three experiments. In experiment I subjects compared the timbres of stimuli produced by a set of 12 musical instruments with equal F0, duration, and loudness. There were three sessions, each at a different F0.
Jeremy Marozeau, Alain de Cheveigné, Stephen Mcadams   +2 more
exaly   +4 more sources

Frequency dependence of resonant tunneling

AIP Conference Proceedings, 1990
The time scale in coherent resonant tunneling is investigated by calculating the Ohmic conductance versus frequency, in one-dimensional single-electron terms, for a resonant-tunneling diode. When the Fermi level is at the resonance energy, the conductance rolls off near the frequency equal to (resonance width)/(Planck’s constant).
Carlo Jacoboni, Peter J. Price
openaire   +1 more source

Frequency dependence and competition

Philosophical Transactions of the Royal Society of London. B, Biological Sciences, 1988
Abstract Intraspecific competition implies interaction among the individuals of a population, so natural selection on genotypic variation in characters related to the competition will necessarily be frequency dependent. Intraspecific antagonistic competition exhibits properties similar to other behavioural interactions between ...
openaire   +3 more sources

Frequency dependence in acupuncture manipulations

2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2009
The internal frequencies of chain network of FHN neurons include two different frequencies, namely, the intrinsic and Canard frequency. When the frequency of external stimuli approaches to the values of these two frequencies, signal processing in the chain will be enhanced.
Wenjie, Si, Jiang, Wang, Yanqiu, Che, Xile, Wei, Feng, Dong   +4 more
openaire   +2 more sources

Frequency dependent hyperpolarizabilities of polyynes

The Journal of Chemical Physics, 1993
Ab initio calculations have been performed for the static and dynamic polarizability and hyperpolarizability for a series of polyynes C2nH2 using self-consistent field (SCF) (n=1–6) and multiconfiguration self-consistent field (MCSCF) (n=1–4) wave functions.
JASZUNSKI, M, JORGENSEN, P, KOCH, H, AGREN, H, HELGAKER, T   +4 more
openaire   +1 more source

Frequency-Dependent Sampling Linearity

IEEE Transactions on Circuits and Systems I: Regular Papers, 2009
A novel model predicts tracking nonlinearity (NL) in the form of harmonic distortion (HD) for weakly nonlinear (i.e., SFDR > 30 dBc) first-order open-loop sampling circuits. The mechanisms for the NL are exponential settling, amplitude modulation, phase modulation, and discrete-time modulation.
Thomas William Brown, Mikko Hakkarainen, Terri S. Fiez   +2 more
openaire   +1 more source

Frequency-Dependent Choice, Minority Advantages, and Frequency-Dependent Natural Selection

Evolution, 1977
Frequency-dependent natural selection is potentially important both as a mode by which gene frequencies of populations change and also as a possible explanation of the genetic load paradox. If most alleles are maintained at equilibrium under a frequency-dependent mode such that they are selectively equivalent at equilibrium, then no load is felt by ...
openaire   +2 more sources

Frequency-dependent sexual selection

Philosophical Transactions of the Royal Society of London. B, Biological Sciences, 1988
Abstract Sexual selection by female choice is expected to give rise to a frequency-dependent sexual advantage in favour of preferred male phenotypes: the rarer the preferred phenotypes, the more often they are chosen as mates. This ‘rare-male advantage’ can maintain a polymorphism when two or more phenotypes are mated preferentially ...
P, O'Donald, M E, Majerus
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Frequency dependence of the fixed point in a fluctuating frequency comb

2008 Conference on Lasers and Electro-Optics, 2007
We report measurements of the response of a Kerr-lens mode-locked Ti:sapphire frequency comb to pump power modulation. For each setting of the laser, the comb expands and contracts about a particular fixed point in frequency. We measured this fixed point and found that it is within 8% of our frequency comb's center.
Walker, D., Udem, T., Gohle, C., Stein, B., Hänsch, T.   +4 more
openaire   +4 more sources