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Acoustic hailing device

Known as: AHD, Acoustic Hailing Device - AHD 
An acoustic hailing device (AHD) is a specialized loudspeaker that emits high-power sound waves for communicating at a distance. AHDs vary in design… Expand
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Papers overview

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2010
2010
2007 marked the bicentenary of Britain’s abolition of its slave trade. This paper outlines the findings of interviews undertaken… Expand
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2006
2006
A synthetic [simulated] Earth gravity model (SEGM) of the geoid, gravity and topography has been constructed over Australia… Expand
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2006
2006
The results here add to the body of evidence for a systematic north‐south error in the Australian Height Datum (AHD). Previous… Expand
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2006
2006
The paper describes the reliability microkernel framework (RMK), a loadable kernel module for providing application-aware… Expand
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2006
2006
Scene change detection is a fundamental step in automatic video indexing, browsing and retrieval. Fade in and fade out are two… Expand
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2006
2006
Abstract In an absolute sense and over long (>100 km) baselines, the AUSGeoid98 gravimetric-only geoid model does not always… Expand
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2005
2005
Contemporary foraminiferal samples and environmental information were collected from three fringing mangrove environments… Expand
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2004
2004
A decline in the watertable due to a long period of low rainfall, and the disturbance of sulfidic peat soils by dewatering and… Expand
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2004
2004
Abstract The AUSGeoid98 gravimetric geoid model has been compared with 48 GPS-levelling points at a ∼50 km spacing across part of… Expand
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2000
2000
The AUSGeoid98 geoid model is used in conjunction with nation-wide GPS networks and spiritlevelled Australian Height Datum (AHD… Expand
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