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23 papers · 1 filter
Small-Scale Mixing of the Elements
Bruce G. Elmegreen
The progressive mixing and contamination of interstellar gas by supernovae and other processes following the passage of a spiral density wave is reviewed, with an emphasis on the S…
The Relationship Between Gas, Stars, and Star Formation in Irregular Galaxies: A Test of Simple Models
Deidre A. Hunter, Bruce G. Elmegreen, Aomawa L. Baker
We explore various instability models for the onset of star formation in irregular galaxies. Critical gas densities are calculated for gravitational instabilities with a thin, pure…
Observations and Theory of Dynamical Triggers for Star Formation
B. G. Elmegreen
Star formation triggering mechanisms are reviewed, including the direct compression of clouds and globules, the compression and collapse of molecular clouds at the edges of HII reg…
HI Observations of the Spiral Arm Pattern Speed in the Late-Type Barred Galaxy NGC 925
Bruce G. Elmegreen, Eric Wilcots, D. J. Pisano
HI observations with the VLA of the late-type barred galaxy NGC 925 show clear streaming motions along four spiral arms close to the minor axis. A transition from inward streaming…
The quantum capacity is properly defined without encodings
H. Barnum, J. A. Smolin, B. M. Terhal
We show that no source encoding is needed in the definition of the capacity of a quantum channel for carrying quantum information. This allows us to use the coherent information ma…
Absence of Localization in Certain Field Effect Transistors
S Washburn, D Popovic, KP Li +1
We review some experimental and theoretical results on the metal-to-insulator transition (MIT) observed at zero magnetic field (B=0) in several two-dimensional electron systems (2D…