A group rotation factor of a non-rigid Rank-1 map

1988 ◽  
pp. 425-439 ◽  
Author(s):  
Jonathan King
Keyword(s):  
Rotation Factor ◽  
Group Rotation

Improving the quality of positioning and reducing the rotation factor during pediatric portable chest radiography using infant immobilizer

2018 ◽  
Vol 7 (2) ◽  
Author(s):  
Alireza Mahmoudabadi ◽  
Majid Sadeghi Moghadam ◽  
Moosa Sajjadi ◽  
Majid Shams ◽  
Leila Ameri
Keyword(s):  
Chest Radiography ◽  
Portable Chest ◽  
Rotation Factor

scholarly journals Monitoring a simple hydrolysis process in an organic solid by observing methyl group rotation

2017 ◽  
Vol 85-86 ◽  
pp. 1-11
Author(s):  
Peter A. Beckmann ◽  
Joseph M. Bohen ◽  
Jamie Ford ◽  
William P. Malachowski ◽  
Clelia W. Mallory ◽  
...  
Keyword(s):  
Methyl Group ◽  
Organic Solid ◽  
Hydrolysis Process ◽  
Group Rotation ◽  
Methyl Group Rotation

scholarly journals The contribution from rotating massive stars to the enrichment in Sr and Ba of the Milky Way

2019 ◽  
Author(s):  
F Rizzuti ◽  
G Cescutti ◽  
F Matteucci ◽  
A Chieffi ◽  
R Hirschi ◽  
...  
Keyword(s):  
Neutron Capture ◽  
Milky Way ◽  
Massive Stars ◽  
Rotational Velocity ◽  
Stellar Rotation ◽  
Deep Impact ◽  
Low Metallicity ◽  
Group Rotation ◽  
R Process ◽  
Chemical Evolution Model

Abstract Most neutron capture elements have a double production by r- and s-processes, but the question of production sites is complex and still open. Recent studies show that including stellar rotation can have a deep impact on nucleosynthesis. We studied the evolution of Sr and Ba in the Milky Way. A chemical evolution model was employed to reproduce the Galactic enrichment. We tested two different nucleosynthesis prescriptions for s-process in massive stars, adopted from the Geneva group and the Rome group. Rotation was taken into account, studying the effects of stars without rotation or rotating with different velocities. We also tested different production sites for the r-process: magneto rotational driven supernovae and neutron star mergers. The evolution of the abundances of Sr and Ba is well reproduced. The comparison with the the most recent observations shows that stellar rotation is a good assumption, but excessive velocities result in overproduction of these elements. In particular, the predicted evolution of the [Sr/Ba] ratio at low metallicity does not explain the data at best if rotation is not included. Adopting different rotational velocities for different stellar mass and metallicity better explains the observed trends. Despite the differences between the two sets of adopted stellar models, both show a better agreement with the data assuming an increase of rotational velocity toward low metallicity. Assuming different r-process sources does not alter this conclusion.

Dynamic NMR study of the factors governing nitroso group rotation inp-nitrosoanilines in the solution and solid states

1995 ◽  
Vol 33 (7) ◽  
pp. 561-569 ◽  
Author(s):  
Daniel A. Fletcher ◽  
Brian G. Gowenlock ◽  
Keith G. Orrell ◽  
Vladimir Šik
Keyword(s):  
Dynamic Nmr ◽  
Nitroso Group ◽  
Solid States ◽  
Nmr Study ◽  
Group Rotation
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