scholarly journals Chaos and Strange Attractors in Pulsar Intensity Records

1992 ◽  
Vol 128 ◽  
pp. 326-328 ◽  
Author(s):  
Roger W. Romani ◽  
J. M. Rankin ◽  
D. C. Backer
Keyword(s):  
Strange Attractors ◽  
Dynamical Model ◽  
High Quality ◽  
Pulse Intensity ◽  
Flux Variability ◽  
Low Dimensionality ◽  
Intensity Fluctuations ◽  
Simple Dynamical Model ◽  
Significant Structure

AbstractWe have examined high quality Arecibo data of three pulsars for evidence of strange attractors in pulse-to-pulse intensity fluctuations. Significant structure was found for PSR 0823+26, and seems related to pulse drifting and nulling activity. The low dimensionality of the possible attractor suggest that a simple dynamical model can explain this component of the flux variability.

scholarly journals Imaging Spectroscopy of Flows in Active Regions

1993 ◽  
Vol 141 ◽  
pp. 542-544
Author(s):  
P. Mein ◽  
N. Mein
Keyword(s):  
Imaging Spectroscopy ◽  
Active Regions ◽  
Dynamical Model ◽  
La Palma ◽  
Simple Dynamical Model

AbstractWe use imaging spectroscopy from the MSDP of the VTT telescope in Tenerife (collaboration Paris-Meudon Observatory and Kiepenheuer Institut) to analyse Doppler velocities of arch filaments in Hα and NαD1. The geometry of the magnetic loops is deduced from perspective effects with a simple dynamical model. Velocities are correlated in both lines.Further results are expected from simultaneous observations with other instruments (SVST of La Palma and Huairou magnetograph).

scholarly journals A simple dynamical model of the oxygen uptake in the human pulmonary acinus

2013 ◽  
Vol 27 (S1) ◽  
Author(s):  
Min‐Yeong KANG ◽  
Aurelie FOUCQUIER ◽  
Marcel FILOCHE ◽  
Bernard SAPOVAL
Keyword(s):  
Oxygen Uptake ◽  
Dynamical Model ◽  
Pulmonary Acinus ◽  
Simple Dynamical Model

scholarly journals The age of water and carbon in lake-catchments: A simple dynamical model

2018 ◽  
Vol 3 (3) ◽  
pp. 236-245 ◽  
Author(s):  
Christopher J. Duffy ◽  
Hilary A. Dugan ◽  
Paul C. Hanson
Keyword(s):  
Dynamical Model ◽  
Simple Dynamical Model

Investigation of Seasonal and Latitudinal Effects on the Expression of Clock Genes in Drosophila

2017 ◽  
Vol 27 (10) ◽  
pp. 1750153 ◽  
Author(s):  
Seyede Sanaz Hosseini ◽  
Fahimeh Nazarimehr ◽  
Sajad Jafari
Keyword(s):  
Dynamical System ◽  
Experimental Data ◽  
Drosophila Melanogaster ◽  
Clock Genes ◽  
Strange Attractors ◽  
Dynamical Model ◽  
Different Seasons ◽  
Latitudinal Variations

The primary goal in this work is to develop a dynamical model capturing the influence of seasonal and latitudinal variations on the expression of Drosophila clock genes. To this end, we study a specific dynamical system with strange attractors that exhibit changes of Drosophila activity in a range of latitudes and across different seasons. Bifurcations of this system are analyzed to peruse the effect of season and latitude on the behavior of clock genes. Existing experimental data collected from the activity of Drosophila melanogaster corroborate the dynamical model.

scholarly journals Single-Pulse Intensity Fluctuations by Cross-Correlation with Longitude of the Average Profile

1992 ◽  
Vol 128 ◽  
pp. 271-277
Author(s):  
M.V. POPOV ◽  
W. Sieber
Keyword(s):  
Spectral Analysis ◽  
Radio Emission ◽  
Cross Correlation ◽  
Regular Structure ◽  
Single Pulse ◽  
Pulse Intensity ◽  
Pulse Radio ◽  
Average Profile ◽  
Intensity Fluctuations

Single-pulse radio emission from pulsars has been observed to vary both in intensity and position inside the pulse window. In some cases the variations show a rather regular structure (drifting subpulses). Such a regular structure can clearly be studied by fluctuation spectral analysis. The analysis has identified some particular peculiarities in the fluctuation spectra at different longitudes of the pulse window in many pulsars (Backer 1973, Page 1973, Popov and Smirnova 1982). In pulsars with complex integrated profiles (PSR 1919+21, PSR 1237+25) narrow features in the fluctuation spectra vary strongly with longitude, at some longitudes being quite undistinguishable.

A simple dynamical model for gravity drainage of brine from growing sea ice

2013 ◽  
Vol 40 (2) ◽  
pp. 307-311 ◽  
Author(s):  
David W. Rees Jones ◽  
M. Grae Worster
Keyword(s):  
Sea Ice ◽  
Dynamical Model ◽  
Gravity Drainage ◽  
Simple Dynamical Model

Notizen: Comparison Between a Generic Reaction- Diffusion Model and a Synergetic Semiconductor System

1987 ◽  
Vol 42 (6) ◽  
pp. 655-656
Author(s):  
J. Parisi ◽  
J. Peinke ◽  
B. Röhricht ◽  
U. Rau ◽  
M. Klein ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Diffusion Model ◽  
Physical Interpretation ◽  
Reaction Diffusion ◽  
Dynamical Model ◽  
Nonlinear Transport ◽  
Reaction Diffusion Model ◽  
Semiconductor System ◽  
Spatio Temporal ◽  
Simple Dynamical Model

This paper gives a concrete physical interpretation of a simple dynamical model based on the universal Rashevsky- Turing theory of symmetry-breaking morphogenesis in terms of spatio-temporal nonlinear transport phenomena in a synergetic semiconductor system.

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