scholarly journals Fundamental Diagrams for Specific Very High Density Crowds

2018 ◽  
Vol 2 ◽  
Author(s):  
Rainald Lohner ◽  
Britto Muhamad ◽  
Prabhu Dambalmath ◽  
Eberhard Haug
Keyword(s):  
High Resolution ◽  
High Density ◽  
Pedestrian Flow ◽  
Density Region ◽  
Video Clips ◽  
Experimental Campaign ◽  
High Density Region ◽  
Very High

An experimental campaign was undertaken to measure the pedestrian flow in the region close to the Kaaba during the Hajj pilgrimages of 2014 and 2015. High resolution video and photographs were used. The space was divided into areas of 10 sqm. The pedestrians were counted, and the velocity measured from video clips. The results were surprising: the velocity in the very high density region increases, which implies also an increase of the flux. The flux in this region (with more than 8 p/sqm) reaches values that exceed 3.5 p/m/sec, much higher than previously recorded under more `standard conditions' in corridors and passages.

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.

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

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.

Vibrational dynamics of very high density amorphous ice studied by high-resolution x-ray spectroscopy

2008 ◽  
Vol 78 (22) ◽  
Author(s):  
Michael Marek Koza ◽  
Burkhard Geil ◽  
Marco Scheuermann ◽  
Helmut Schober ◽  
Giulio Monaco ◽  
...  
Keyword(s):  
High Resolution ◽  
High Density ◽  
Vibrational Dynamics ◽  
X Ray ◽  
Amorphous Ice ◽  
Very High
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