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  • 552.06  (1)
  • Middle Stone Age  (1)
  • Shallow water acoustics  (1)
  • 1
    facet.materialart.
    Unknown
    Hidden in plain sight: A microanalytical study of a Middle Stone Age ochre piece trapped inside a micromorphological block sample (2021)
    Details
    Publication Date: 2021-07-20
    Description: A complete Middle Stone Age ochre piece was unintentionally collected and fully preserved within a micromorphological block sample intended to characterise a 74 ± 3 ka occupation horizon at Blombos Cave, South Africa. Previously recovered ochre pieces from the same stratigraphic context (Still Bay) have displayed intricate modification patterns with significant behavioural implications. Yet, in the case of the trapped ochre, a direct visual assessment of its surfaces was impossible due to its impregnated state. In this study, we demonstrate how we successfully reconstructed three‐dimensionally and characterised the block‐sampled ochre piece using high‐resolution microcomputed tomography scanning coupled with a range of microanalytical techniques, including optical petrography, micro‐Fourier transform infra‐red spectroscopy, micro‐X‐ray fluorescence and micro‐Raman spectroscopy. Through a morphometric analysis of the score marks present on the trapped ochre's reconstructed surface, we were able to assess the types of modifications and the nature of the actions that created them. Our results show that a block sample‐based study of archaeological artefacts allows for a comprehensive assessment of their depositional and microcontextual setting, their external morphology and microtopography, as well as their internal texture and geochemical properties. We suggest that this type of context‐sensitive, multiscalar and multidisciplinary investigation may also prove beneficial in the study of conventionally recovered archaeological artefacts.
    Description: Fundação Amazônia Paraense de Amparo à Pesquisa http://dx.doi.org/10.13039/501100005288
    Description: Norges Forskningsråd http://dx.doi.org/10.13039/501100005416
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: FP7 Ideas: European Research Council http://dx.doi.org/10.13039/100011199
    Keywords: 552.06 ; geoarchaeology ; micro‐CT ; micro‐FTIR ; micromorphology ; micro‐Raman ; micro‐XRF ; Middle Stone Age ; ochre
    Type: article
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    CITATION GEO-LEO
  • 2
    facet.materialart.
    Unknown
    Acoustic intensity fluctuations induced by South China Sea internal tides and solitons (2006)
    IEEE
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © IEEE, 2004. This article is posted here by permission of IEEE for personal use, not for redistribution. The definitive version was published in IEEE Journal of Oceanic Engineering 29 (2004): 1249-1263, doi:10.1109/JOE.2004.834173.
    Description: Between late April and May 23, 2001, a suite of acoustic and oceanographic sensors was deployed by a team of U.S., Taiwan, and Singapore scientists in the northeastern South China Sea to study the effects of ocean variability on low-frequency sound propagation in a shelfbreak environment. The primary acoustic receiver was an L-shaped hydrophone array moored on the continental shelf that monitored a variety of signals transmitted along and across the shelfbreak by moored sources. This paper discusses and contrasts the fluctuations in the 400-Hz signals transmitted across the shelfbreak and measured by the vertical segment of the listening array on two different days, one with the passage of several huge solitons that depressed the shallow isotherms to near the sea bottom and one with a much less energetic internal wavefield. In addition to exhibiting large and rapid temporal changes, the acoustic data show a much more vertically diffused sound intensity field as the huge solitons occupied and passed through the transmission path. Using a space-time continuous empirical sound-speed model based on the moored temperature records, the observed acoustic intensity fluctuations are explained using coupled-mode physics.
    Description: This work was supported by the U.S. Office of Naval Research.
    Keywords: Intensity fluctuations ; Nonlinear internal waves ; Shallow water acoustics ; South China Sea (SCS)
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: 1369570 bytes
    Format: application/pdf
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    PAPER (OA)
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