scholarly journals The impact of parametric noise amplification on long haul transmission throughput

2015 ◽  
Author(s):  
A. D. Ellis ◽  
S. T. Le ◽  
M. E. McCarthy ◽  
S. K. Turitsyn
Keyword(s):  
Parametric Noise ◽  
Noise Amplification ◽  
The Impact

scholarly journals Deciphering noise amplification and reduction in open chemical reaction networks

2018 ◽  
Author(s):  
Fabrizio Pucci ◽  
Marianne Rooman
Keyword(s):  
Differential Equation ◽  
Molecular Species ◽  
Dynamical Behavior ◽  
Intrinsic Noise ◽  
Mass Action ◽  
Model Systems ◽  
Reaction Networks ◽  
Mass Action Kinetics ◽  
Noise Amplification ◽  
The Impact

AbstractThe impact of fluctuations on the dynamical behavior of complex biological systems is a longstanding issue, whose understanding would elucidate how evolutionary pressure tends to modulate intrinsic noise. Using the Itō stochastic differential equation formalism, we performed analytic and numerical analyses of model systems containing different molecular species in contact with the environment and interacting with each other through mass-action kinetics. For networks of zero deficiency, which admit a detailed- or complex-balanced steady state, all molecular species are uncorrelated and their Fano factors are Poissonian. Systems of higher deficiency have non-equilibrium steady states and non-zero reaction fluxes flowing between the complexes. When they model homooligomerization, the noise on each species is reduced when the flux flows from the oligomers of lowest to highest degree, and amplified otherwise. In the case of hetero-oligomerization systems, only the noise on the highest-degree species shows this behavior.

Observation of parametric noise amplification owing to modulation instability in anomalous dispersion regime

1995 ◽  
Vol 31 (13) ◽  
pp. 1088-1090 ◽  
Author(s):  
R.A. Saunders ◽  
R.E. Epworth ◽  
D. Garthe ◽  
W.S. Lee ◽  
B.L. Patel
Keyword(s):  
Modulation Instability ◽  
Anomalous Dispersion ◽  
Dispersion Regime ◽  
Parametric Noise ◽  
Noise Amplification

scholarly journals Deciphering noise amplification and reduction in open chemical reaction networks

2018 ◽  
Vol 15 (149) ◽  
pp. 20180805
Author(s):  
Fabrizio Pucci ◽  
Marianne Rooman
Keyword(s):  
Differential Equation ◽  
Molecular Species ◽  
Intrinsic Noise ◽  
Dynamical Behaviour ◽  
Mass Action ◽  
Model Systems ◽  
Reaction Networks ◽  
Mass Action Kinetics ◽  
Noise Amplification ◽  
The Impact

The impact of fluctuations on the dynamical behaviour of complex biological systems is a longstanding issue, whose understanding would elucidate how evolutionary pressure tends to modulate intrinsic noise. Using the Itō stochastic differential equation formalism, we performed analytic and numerical analyses of model systems containing different molecular species in contact with the environment and interacting with each other through mass-action kinetics. For networks of zero deficiency, which admit a detailed- or complex-balanced steady state, all molecular species are uncorrelated and their Fano factors are Poissonian. Systems of higher deficiency have non-equilibrium steady states and non-zero reaction fluxes flowing between the complexes. When they model homo-oligomerization, the noise on each species is reduced when the flux flows from the oligomers of lowest to highest degree, and amplified otherwise. In the case of hetero-oligomerization systems, only the noise on the highest-degree species shows this behaviour.

An Algorithms for Super-Resolution Reconstruction of Video Based on Spatio-Temporal Adaptive

2012 ◽  
Vol 532-533 ◽  
pp. 1680-1684
Author(s):  
Meng He Li ◽  
Chuan Lin ◽  
Jing Bei Tian ◽  
Sheng Hui Pan
Keyword(s):  
Adaptive Algorithm ◽  
Super Resolution ◽  
Reconstruction Algorithm ◽  
Image Sequences ◽  
Adaptive Mechanism ◽  
Signal To Noise ◽  
Spatio Temporal ◽  
Noise Amplification ◽  
The Impact ◽  
Better Than

For the weakness of conventional POCS algorithms, a novel spatio-temporal adaptive super-resolution reconstruction algorithm of video is proposed in this paper. The spatio-temporal adaptive mechanism, which is based on POCS super-resolution reconstruction algorithm, can effectively prevent reconstructed image from the influence of inaccuracy of motion information and avoid the impact of noise amplification, which exist in using conventional POCS algorithms to reconstruct image sequences in dramatic motion. Experimental results show that the spatio-temporal adaptive algorithm not only effectively alleviate amplification noise but is better than the traditional POCS algorithms in signal to noise ration.

Formation of Lunar Craters and Bright Rays as a Result of Meteorite Impacts

1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten
Keyword(s):  
Explosive Charge ◽  
The Moon ◽  
Meteorite Impacts ◽  
The Earth ◽  
Lunar Craters ◽  
The Impact

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

Asteroid and Comet Impact Speeds upon Mars: Significance for Panspermia and the Supply of Organics

1997 ◽  
Vol 161 ◽  
pp. 197-201 ◽  
Author(s):  
Duncan Steel
Keyword(s):  
Probability Distributions ◽  
Regions Of Interest ◽  
Significant Fraction ◽  
Organic Chemicals ◽  
Impact Speed ◽  
The Mean ◽  
The Impact

AbstractWhilst lithopanspermia depends upon massive impacts occurring at a speed above some limit, the intact delivery of organic chemicals or other volatiles to a planet requires the impact speed to be below some other limit such that a significant fraction of that material escapes destruction. Thus the two opposite ends of the impact speed distributions are the regions of interest in the bioastronomical context, whereas much modelling work on impacts delivers, or makes use of, only the mean speed. Here the probability distributions of impact speeds upon Mars are calculated for (i) the orbital distribution of known asteroids; and (ii) the expected distribution of near-parabolic cometary orbits. It is found that cometary impacts are far more likely to eject rocks from Mars (over 99 percent of the cometary impacts are at speeds above 20 km/sec, but at most 5 percent of the asteroidal impacts); paradoxically, the objects impacting at speeds low enough to make organic/volatile survival possible (the asteroids) are those which are depleted in such species.

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