scholarly journals The high field side high density region in SOLPS-modeling of nitrogen-seeded H-modes in ASDEX Upgrade

2017 ◽  
Vol 12 ◽  
pp. 193-199 ◽  
Author(s):  
F. Reimold ◽  
M. Wischmeier ◽  
S. Potzel ◽  
L. Guimarais ◽  
D. Reiter ◽  
...  
Keyword(s):  
High Field ◽  
High Density ◽  
Density Region ◽  
High Density Region

scholarly journals Early Shaping of Asymmetric Planetary Nebulae

1989 ◽  
Vol 106 ◽  
pp. 232-232
Author(s):  
Noam Soker
Keyword(s):  
Planetary Nebula ◽  
Binary Star ◽  
Symmetry Plane ◽  
Planetary Nebulae ◽  
High Density ◽  
Close Binary ◽  
Density Region ◽  
Short Period ◽  
Fast Wind ◽  
High Density Region

We suggest that the shape of a young asymmetric planetary nebulae may be influenced by a close binary star located at its center. This binary is a relic of the common envelope phase, presumably through which the asymmetric planetary nebula evolved. We assume that for a short period of time, shortly after the cession of the slow wind and long before the fast wind becomes effective, the binary ejects a small amount of mass, mainly in the equatorial plane. In this work we do not discuss the exact mechanism for the ejection of this pulse of mass. In the case in which the cooling is very efficient, (i.e., high-Mach-number isothermal flow), we can solve the problem analytically by using a few simplifying assumptions. In this case the high density region is shaped like a ring. We use two-dimensional hydrodynamics for the more general case. We find that at late times the high density region has a “horseshoe” shape, as viewed in the symmetry plane. There is an instability in the maximum density region. Finally we compare our results with the shape of the planetary nebula M2-9.

Density dependence of the Hanle effect of the 4s4p1P1 level of neutral calcium

1980 ◽  
Vol 58 (7) ◽  
pp. 1004-1009 ◽  
Author(s):  
F. M. Kelly ◽  
M. S. Mathur
Keyword(s):  
Density Dependence ◽  
High Density ◽  
Low Density ◽  
Density Region ◽  
Hanle Effect ◽  
Wide Range ◽  
High Density Region

The Hanle effect in the 4s21S0–4s4p1P1 (4226.7 Å) transition in Ca I has been observed over a wide range of densities. The low density observations determine the lifetime of the 1P1 level to be 4.49 ns. Collision parameters are obtained from observations in the high density region.

Semi-supervised learning based on high density region estimation

2010 ◽  
Vol 23 (7) ◽  
pp. 812-818 ◽  
Author(s):  
Hong Chen ◽  
Luoqing Li ◽  
Jiangtao Peng
Keyword(s):  
Supervised Learning ◽  
High Density ◽  
Density Region ◽  
High Density Region

scholarly journals Bayesian reconstruction of images of objects with high-density inclusions with suppression of artifacts

2018 ◽  
Vol 145 ◽  
pp. 05017
Author(s):  
Sergei Zolotarev ◽  
Valery Vengrinovich ◽  
Mohsen Mirzavand ◽  
Mieteeg Mukhtar ◽  
Ivan Georgiev
Keyword(s):  
Tomographic Reconstruction ◽  
Three Dimensional ◽  
Original Method ◽  
High Density ◽  
X Rays ◽  
Two Dimensional ◽  
Density Region ◽  
Bayesian Reconstruction ◽  
Mathematical Algorithm ◽  
High Density Region

The technology of three-dimensional Bayesian tomographic reconstruction of homogeneous objects with high-density inclusions is developed. The approach is based on preliminary correction of projections by extracting the data corresponding to X-rays passing through a high-density region, and replacing it with synthesized data obtained by two-dimensional interpolation. An original method for selecting interpolation points is proposed and a mathematical algorithm is described that ensures the implementation of two-dimensional interpolation correction of projections.

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