Estimates of the Exponential Decay of Perturbations Superimposed on the Longitudinal Harmonic Vibrations of a Viscous Layer

2020 ◽  
Vol 56 (10) ◽  
pp. 1335-1344
Author(s):  
D. V. Georgievskii
Keyword(s):  
Exponential Decay ◽  
Viscous Layer ◽  
Harmonic Vibrations

On similarity solutions of the boundary-layer equations with algebraic decay

1965 ◽  
Vol 23 (4) ◽  
pp. 673-687 ◽  
Author(s):  
S. N. Brown ◽  
K. Stewartson
Keyword(s):  
Boundary Layer ◽  
Viscous Flow ◽  
Exponential Decay ◽  
Similarity Solutions ◽  
Viscous Layer ◽  
Algebraic Decay ◽  
Outer Limit ◽  
Boundary Layer Equations ◽  
Limit Solutions

Similarity solutions in which the vorticity decays algebraically towards the outer limit of the viscous layer are shown to be possible limit solutions of the full boundary-layer equations with exponential decay. The discussion is illustrated by consideration of a mainstream applicable to viscous flow in a cone.

14 years of 6.7 GHz periodic methanol maser observations towards G188.95+0.89

2019 ◽  
Vol 15 (S356) ◽  
pp. 393-394
Author(s):  
Martin M. Mutie ◽  
Paul Baki ◽  
James O. Chibueze ◽  
Khadija El Bouchefry
Keyword(s):  
Radio Telescope ◽  
Exponential Decay ◽  
Hii Regions ◽  
Monitoring Period ◽  
Methanol Maser ◽  
Spectral Components ◽  
Methanol Masers ◽  
Compact Hii Regions

AbstractWe report the results of 14 years of monitoring of G188.95+0.89 periodic 6.7 GHz methanol masers using the Hartebeesthoek 26-m radio telescope. G188.95+0.89 (S252, AFGL5180) is a radio-quiet methanol maser site that is often interpreted as precursors of ultra-compact HII regions or massive protostar sites. At least five bright spectral components were identified. The maser feature at 11.36 km s-1 was found to experience an exponential decay during the monitoring period. The millimetre continuum reveals two cores associated with the source.

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