ORCID Profile
0000-0001-9987-010X
Current Organisation
University of Galway
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Publisher: No publisher found
Date: 2004
Publisher: Informa UK Limited
Date: 05-11-2020
Publisher: Elsevier BV
Date: 07-1999
Publisher: Project MUSE
Date: 2020
Publisher: Fennia - International Journal of Geography
Date: 31-10-2018
Abstract: Prompted by Nick Gill’s review essay, ‘The suppression of welcome’, this commentary additionally reflects on attendant questions of security and responsibility in seeking to conceptualize a more human-centred vision of populations and population management in our current moment of refugee crisis in Europe. It charts how we might productively conceptualize and enact a ‘human security’ vision of population management, how such a vision requires us to think differently and cooperatively about security, and ultimately how this compels us to supplant a prevailing narrative of external threat and risk with a story of shared precarity, human empathy and collective responsibility.
Publisher: SAGE Publications, Ltd
Date: 2014
Publisher: SAGE Publications, Ltd
Date: 2014
Publisher: SAGE Publications, Ltd
Date: 2014
Publisher: Wiley
Date: 22-02-2011
Publisher: Wiley
Date: 14-02-2013
Publisher: Informa UK Limited
Date: 08-2005
Publisher: Informa UK Limited
Date: 2002
Publisher: SAGE Publications, Ltd
Date: 2014
Publisher: Elsevier BV
Date: 02-2013
DOI: 10.1016/J.ACTBIO.2012.11.005
Abstract: During recent decades, research on biological systems such as abalone shell and fish armor has revealed that these biological systems employ carefully arranged hierarchical multilayered structures to achieve properties of high strength, high ductility and light weight. Knowledge of such structures may enable pathways to design bio-inspired materials for various applications. This study was conducted to investigate the spatial distribution of structure, chemical composition and mechanical properties in mineralized fish scales of the species Atractosteus spatula. Microindentation tests were conducted, and cracking patterns and damage sites in the scales were examined to investigate the underlying protective mechanisms of fish scales under impact and penetration loads. A difference in nanomechanical properties was observed, with a thinner, stiffer and harder outer layer (indentation modulus ∼69 GPa and hardness ∼3.3 GPa) on a more compliant and thicker inner layer (indentation modulus ∼14.3 GPa and hardness ∼0.5 GPa). High-resolution scanning electron microscopy imaging of a fracture surface revealed that the outer layer contained oriented nanorods embedded in a matrix, and that the nanostructure of the inner layer contained fiber-like structures organized in a complex layered pattern. Damage patterns formed during microindentation show complex deformation mechanisms. Images of cracks identify growth through the outer layer, then deflection along the interface before growing and arresting in the inner layer. High-magnification images of the crack tip in the inner layer show void-linking and fiber-bridging exhibiting inelastic behavior. The observed difference in mechanical properties and unique nanostructures of different layers may have contributed to the resistance of fish scales to failure by impact and penetration loading.
Publisher: SAGE Publications, Ltd
Date: 2014
Publisher: SAGE Publications
Date: 15-11-2012
Publisher: SAGE Publications, Ltd
Date: 2014
Publisher: Wiley
Date: 30-11-2011
Publisher: SAGE Publications
Date: 06-2001
Publisher: Wiley
Date: 26-11-2016
DOI: 10.1111/GEOJ.12118
Publisher: Geographical Society of Ireland
Date: 2004
Publisher: Elsevier BV
Date: 12-2019
Publisher: Informa UK Limited
Date: 09-10-2016
Publisher: Routledge
Date: 13-01-2008
Publisher: Informa UK Limited
Date: 04-2011
Publisher: Librello
Date: 09-07-2021
Publisher: Informa UK Limited
Date: 07-11-2015
Publisher: SAGE Publications
Date: 07-2009
Publisher: Informa UK Limited
Date: 04-12-2013
Publisher: Informa UK Limited
Date: 12-2013
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2015
End Date: End date not available
Funder: Irish Research Council
View Funded ActivityStart Date: 2007
End Date: End date not available
Funder: Irish Research Council
View Funded Activity