Bose gases and their Fermi cousins
Article Abstract:
The field of quantum degenerate gases has until recently been regarded as a sub-field of laser cooling and atomic physics. However, this field is now making a significant contribution to areas such as many-body quantum mechanics and condensed-matter physics. Important recent developments in this area include a new technique for probing a condensate known as 'Bragg spectroscopy' and progress towards the quantum degeneracy of fermions, particularly the cooling of a dilute gas of potassium atoms.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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A thermoacoustic Stirling heat engine
Article Abstract:
Heat engines are limited by the laws of thermodynamics and other practical considerations such as building and operation costs. High efficiencies are only obtained in expensive, sophisticated engines. An inexpensive thermoacoustic engine is demonstrated, that uses the Stirling cycle. It is based on simple acoustic apparatus with no moving parts, and its efficiency is comparable to that of the common internal combustion engine.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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