scholarly journals Dynamic Characterization of Large-scale Structures through Mobile-phone Application

2015 ◽  
Vol 15 (4) ◽  
pp. 99-105 ◽  
Author(s):  
Young-Seok Jung ◽  
Sung-Won Yoon
Keyword(s):  
Mobile Phone ◽  
Large Scale ◽  
Dynamic Characterization ◽  
Mobile Phone Application ◽  
Large Scale Structures ◽  
Scale Structures

scholarly journals Fabry-Perot spectroscopy: a powerful method for detecting superbubbles in galaxy discs

2014 ◽  
Vol 10 (S309) ◽  
pp. 303-303
Author(s):  
A. Camps-Fariña ◽  
J. Beckman ◽  
J. Zaragoza-Cardiel ◽  
J. Font ◽  
K. Fathi
Keyword(s):  
Large Scale ◽  
Massive Star ◽  
Line Of Sight ◽  
Line Profiles ◽  
Large Scale Structures ◽  
Wide Range ◽  
Fabry Perot ◽  
Projection Effect ◽  
Scale Structures

AbstractWe present a new method for the detection and characterization of large scale expansion in galaxy discs based on Hα Fabry-Perot spectroscopy, taking advantage of the high spatial and velocity resolution of our instrument (GHαFaS). The method analyses multi-peaked emission line profiles to find expansion along the line of sight on a pixel-by-pixel basis. At this stage we have centred our attention on the large scale structures of expansive gas which show a coherent gradient of velocities from their centres as a result of both bubble shape and projection effect. The results show a wide range of expansion velocities in these superbubbles, ranging from 30-150 km/s, with the expected trend of finding the higher velocities in the more violent areas of the galaxies. We have applied the technique to the Antennae and M83, obtaining spectacular results, and used these to investigate to what extent kinematically derived ages can be found and used to characterize the ages of their massive star clusters.

NON-THERMAL PHENOMENA IN GALAXY CLUSTERS

2012 ◽  
Vol 12 ◽  
pp. 280-289
Author(s):  
CHIARA FERRARI
Keyword(s):  
Galaxy Clusters ◽  
Large Scale ◽  
Thermal Component ◽  
X Ray ◽  
Large Scale Structures ◽  
Weak Magnetic Fields ◽  
Scale Structures ◽  
Thermal Phenomena ◽  
New Generation

The existence of cosmic rays and weak magnetic fields in the intracluster volume has been well proven by deep radio observations of galaxy clusters. However a detailed physical characterization of the non-thermal component of large scale-structures, relevant for high-precision cosmology, is still missing. I will show the importance of combining numerical and theoretical works with cluster observations by a new-generation of radio, Gamma- and X-ray instruments.

Characterization of large-scale structures in a forced ducted flow with dump

AIAA Journal ◽  
1987 ◽  
Vol 25 (9) ◽  
pp. 1164-1170 ◽  
Author(s):  
K. C. Schadow ◽  
K. J. Wilson ◽  
E. Gutmark
Keyword(s):  
Large Scale ◽  
Large Scale Structures ◽  
Scale Structures

Some comments about observations and image processing of comet 29P/Schwassmann-Wachmann 1

1999 ◽  
Vol 173 ◽  
pp. 243-248
Author(s):  
D. Kubáček ◽  
A. Galád ◽  
A. Pravda
Keyword(s):  
Image Processing ◽  
Large Scale ◽  
Harvard College ◽  
Oak Ridge ◽  
Large Scale Structures ◽  
Short Period Comet ◽  
Short Period ◽  
Scale Structures ◽  
Harvard College Observatory ◽  
Period Comet

AbstractUnusual short-period comet 29P/Schwassmann-Wachmann 1 inspired many observers to explain its unpredictable outbursts. In this paper large scale structures and features from the inner part of the coma in time periods around outbursts are studied. CCD images were taken at Whipple Observatory, Mt. Hopkins, in 1989 and at Astronomical Observatory, Modra, from 1995 to 1998. Photographic plates of the comet were taken at Harvard College Observatory, Oak Ridge, from 1974 to 1982. The latter were digitized at first to apply the same techniques of image processing for optimizing the visibility of features in the coma during outbursts. Outbursts and coma structures show various shapes.

scholarly journals The organization and control of an evolving interdependent population

2015 ◽  
Vol 12 (108) ◽  
pp. 20150044 ◽  
Author(s):  
Dervis C. Vural ◽  
Alexander Isakov ◽  
L. Mahadevan
Keyword(s):  
Evolutionary Game Theory ◽  
Large Scale ◽  
Social Evolution ◽  
Evolutionary Game ◽  
Large Scale Structures ◽  
External Perturbations ◽  
Emergence Of Cooperation ◽  
Scale Structures ◽  
And Control ◽  
Evolutionarily Stable

Starting with Darwin, biologists have asked how populations evolve from a low fitness state that is evolutionarily stable to a high fitness state that is not. Specifically of interest is the emergence of cooperation and multicellularity where the fitness of individuals often appears in conflict with that of the population. Theories of social evolution and evolutionary game theory have produced a number of fruitful results employing two-state two-body frameworks. In this study, we depart from this tradition and instead consider a multi-player, multi-state evolutionary game, in which the fitness of an agent is determined by its relationship to an arbitrary number of other agents. We show that populations organize themselves in one of four distinct phases of interdependence depending on one parameter, selection strength. Some of these phases involve the formation of specialized large-scale structures. We then describe how the evolution of independence can be manipulated through various external perturbations.

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