scholarly journals Formation and Loss of Hierarchical Structure in Two‐dimensional Magnetohydrodynamic Simulations of Wave‐driven Turbulence in Interstellar Clouds

1999 ◽  
Vol 527 (1) ◽  
pp. 266-284 ◽  
Author(s):  
Bruce G. Elmegreen
Keyword(s):  
Hierarchical Structure ◽  
Two Dimensional ◽  
Interstellar Clouds ◽  
Magnetohydrodynamic Simulations

MAGNETIC FIELD AMPLIFICATION BY RELATIVISTIC SHOCKS IN AN INHOMOGENEOUS MEDIUM

2012 ◽  
Vol 08 ◽  
pp. 364-367
Author(s):  
YOSUKE MIZUNO ◽  
MARTIN POHL ◽  
JACEK NIEMIEC ◽  
BING ZHANG ◽  
KEN-ICHI NISHIKAWA ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Inhomogeneous Medium ◽  
Magnetic Energy ◽  
Small Scale ◽  
Two Dimensional ◽  
Filamentary Structure ◽  
Field Amplification ◽  
Relativistic Shocks ◽  
Field Lines ◽  
Magnetohydrodynamic Simulations

We perform two-dimensional relativistic magnetohydrodynamic simulations of a mildly relativistic shock propagating through an inhomogeneous medium. We show that the postshock region becomes turbulent owing to preshock density inhomogeneity, and the magnetic field is strongly amplified due to the stretching and folding of field lines in the turbulent velocity field. The amplified magnetic field evolves into a filamentary structure in two-dimensional simulations. The magnetic energy spectrum is flatter than the Kolmogorov spectrum and indicates that the so-called small-scale dynamo is occurring in the postshock region. We also find that the amplitude of magnetic-field amplification depends on the direction of the mean preshock magnetic field.

scholarly journals Two-dimensional Radiative Magnetohydrodynamic Simulations of Partial Ionization in the Chromosphere. II. Dynamics and Energetics of the Low Solar Atmosphere

2017 ◽  
Vol 847 (1) ◽  
pp. 36 ◽  
Author(s):  
Juan Martínez-Sykora ◽  
Bart De Pontieu ◽  
Mats Carlsson ◽  
Viggo H. Hansteen ◽  
Daniel Nóbrega-Siverio ◽  
...  
Keyword(s):  
Solar Atmosphere ◽  
Two Dimensional ◽  
Magnetohydrodynamic Simulations

Space-Optimized Tree: A Connection+Enclosure Approach for the Visualization of Large Hierarchies

2003 ◽  
Vol 2 (1) ◽  
pp. 3-15 ◽  
Author(s):  
Quang Vinh Nguyen ◽  
Mao Lin Huang
Keyword(s):  
Hierarchical Structure ◽  
Dimensional Space ◽  
Tree Structure ◽  
Relational Data ◽  
Two Dimensional ◽  
Approach Space ◽  
Link Diagram ◽  
New Approach ◽  
Semantic Zooming ◽  
Tree Visualization

This paper describes a new approach, space-optimized tree, for the visualization and navigation of tree-structured relational data. This technique can be used especially for the display of very large hierarchies in a two-dimensional space. We discuss the advantages and limitations of current techniques of tree visualization. Our strategy is to optimize the drawing of trees in a geometrical plane and maximize the utilization of display space by allowing more nodes and links to be displayed at a limited screen resolution. Space-optimized tree is a connection+ enclosure visualization approach that recursively positions children of a subtree into polygon areas and still uses a node–link diagram to present the entire hierarchical structure. To be able to handle the navigation of large hierarchies, we use a new hybrid viewing technique that combines two viewing methods, the modified semantic zooming and a focus+ context technique. While the semantic zooming technique can enlarge a particular viewing area by filtering out the rest of tree structure from the visualization, the focus+context technique allows the user to interactively focus, view and browse the entire visual structure with a reasonable high-density display.

Hierarchical structure analysis of interstellar clouds using nonorthogonal wavelets

1993 ◽  
Vol 408 ◽  
pp. L45 ◽  
Author(s):  
William D. Langer ◽  
Robert W. Wilson ◽  
Charles H. Anderson
Keyword(s):  
Structure Analysis ◽  
Hierarchical Structure ◽  
Interstellar Clouds

Beamtrees: Compact Visualization of Large Hierarchies

2003 ◽  
Vol 2 (1) ◽  
pp. 31-39 ◽  
Author(s):  
Frank van Ham ◽  
Jarke J. van Wijk
Keyword(s):  
Hierarchical Structure ◽  
User Study ◽  
Three Dimensional ◽  
New Method ◽  
Data Sets ◽  
Two Dimensional ◽  
Hierarchical Data ◽  
Organization Structures ◽  
The Hierarchical Structure

Beamtrees are a new method for the visualization of large hierarchical data sets, such as directory structures and organization structures. Nodes are shown as stacked circular beams such that both the hierarchical structure as well as the size of nodes are depicted. The dimensions of beams are calculated using a variation of the treemap algorithm. Both a two-dimensional and a three-dimensional variant are presented. A small user study indicated that beamtrees are significantly more effective than nested treemaps and cushion treemaps for the extraction of global hierarchical information.

scholarly journals Imperfections in a two-dimensional hierarchical structure

2014 ◽  
Vol 89 (2) ◽  
Author(s):  
Daniel Rayneau-Kirkhope ◽  
Yong Mao ◽  
Robert Farr
Keyword(s):  
Hierarchical Structure ◽  
Two Dimensional

Self-consistent, two-dimensional, magnetohydrodynamic simulations of magnetically driven flyer plates

2003 ◽  
Vol 10 (5) ◽  
pp. 1867-1874 ◽  
Author(s):  
R. W. Lemke ◽  
M. D. Knudson ◽  
A. C. Robinson ◽  
T. A. Haill ◽  
K. W. Struve ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Self Consistent ◽  
Magnetohydrodynamic Simulations
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