Helicopter main-rotor speed effects: A comparison of predicted ranges of detection from the aural detection program ICHIN and the electronic detection program ARCAS

NASA LaRC personnel have conducted a strudy of the predicted acoustic detection ranges associated with reduced helicopter main rotor speeds. This was accomplished by providing identical input information to both the aural detection program ICHIN 6, (I Can Hear It Now, version 6) and the electronic acoustic detection program ARCAS (Assessment of Rotorcraft Detection by Acoustics Sensing). In this study, it was concluded that reducing the main rotor speed of the helicopter by 27 percent reduced both the predicted aural and electronic detection ranges by approximately 50 percent. Additionally, ARCAS was observed to function better with narrowband spectral input than with one-third octave band spectral inputs and the predicted electronic range of acoustic detection is greater than the predicted aural detection range

Possible Evidence of Domestic Dog in a Paleoeskimo Context

... domestic dogs played a significant role in the adaptive strategies of most historic Inuit and their archaeological predecessors, the Neoeskimo. ... More skeletal material would be desirable in order to provide a firm identification; nonetheless, the available evidence strongly suggests that a domestic or tamed canid is represented. This conclusion lends some measure of support to the idea that domestic dogs are an integral part of cultural adaptation to the arctic, and as such will probably be shown to have had a widespread distribution in Paleoeskimo cultures

A Nineteenth-Century Mackenzie Inuit Site near Inuvik, Northwest Territories

A small collection of artifacts obtained from an aboriginal Mackenzie Inuit grave eroded by the Mackenzie River is described. The site appears to date to within the second half of the 19 century, following European contact but before acculturative processes and population decline, which brought about the extinction of traditional Mackenzie Inuit culture.Key words: Inuit, archaeology, Mackenzie delta, nineteenth century, artifacts, erosionMots clés: Inuit, archéologie, delta du Mackenzie, 19e siècle, artefacts, érosio

A Paleoeskimo Occupation on Southern Banks Island, N.W.T.

Significant changes occurred within Paleoeskimo cultures during the first millenium B.C. Archaeological remains from the Lagoon site, on Banks Island, N.W.T., provide a new perspective on the nature of those changes and insights into some of the processes involved