title: Improving the probing depth of thermographic inspections of polymer composite materials

authors: Olafsson, G.

subjects: Science & Technology

abstract: The maximum depth for which a defect of a given size can be detected in thermographic inspections is known as the 'probing depth'. For materials such as polymer composites, with low through-thickness thermal diffusivity, inspections are limited to thin materials or near surface inspection. With the aim of improving probing depth, the paper describes how established signal processing techniques are adapted for thermographic inspections. The procedures are implemented for both pulse thermography and pulse phase thermography inspections of laminated composite materials and sandwich structures. It is demonstrated that the adaptation significantly improves the probing depth, identifying defects that could not be identified using existing procedures. The applicability of the new approaches is discussed, paying particular attention to systematic and random errors resulting from equipment setup. Simple and efficient compensation methods to reduce the effect these errors are presented.

text: Improving the probing depth of thermographic inspections of polymer composite materials The maximum depth for which a defect of a given size can be detected in thermographic inspections is known as the 'probing depth'. For materials such as polymer composites, with low through-thickness thermal diffusivity, inspections are limited to thin materials or near surface inspection. With the aim of improving probing depth, the paper describes how established signal processing techniques are adapted for thermographic inspections. The procedures are implemented for both pulse thermography and pulse phase thermography inspections of laminated composite materials and sandwich structures. It is demonstrated that the adaptation significantly improves the probing depth, identifying defects that could not be identified using existing procedures. The applicability of the new approaches is discussed, paying particular attention to systematic and random errors resulting from equipment setup. Simple and efficient compensation methods to reduce the effect these errors are presented.

year: 2019

title: When citizen politics becomes uncivil: Between popular protest, civil society and governance in Jamaica

authors: Johnson, Hume Nicola

subjects: Popular protest

abstract: This thesis focuses on the problem of incivility within the domains of citizen politics and civil society by exploring the proclivity for popular protest in Jamaica and the intersections between popular citizen protest, civil society and governance in this context. It scrutinizes the tenor of contemporary civilian politics and assesses the consequent impact on the quality of civil society more broadly. The thesis challenges the assumption within accepted definitions of civil society that civic participation is always positive. It does so by examining the manner in which citizens engage collectively to defend their interests and make claims upon the state, as well as the extent to which this model of political participation serves the agenda and promise of civil society.
Through an in-depth, country-specific, empirical case study, the thesis examines micro social processes of power at community level to raise questions about who should be represented in civil society and how the voices of the marginalized are to be heard. In this regard, it explores the role of social inequality, feelings of social injustice and political exclusion as contributory factors in the existing tenor of citizen politics in Jamaica. It also examines the challenges facing the contemporary state and the impact of violent protests on state engagement, public action and political performance. The study analyses the lived experiences, observations and perspectives of a wide cross section of Jamaican citizens, gleaned from face-to-face interviews, focus group discussions, as well as a range of secondary material, including audio-visual data, to illuminate this process of struggle and underscore the factors which drive violent protests in this political context.
The thesis concludes that maximum disruption, including violence, has not only become the basis of civil protest in Jamaica, but that the varied and contradictory responses of the state bureaucracy and political actors (Members of Parliament, activists, other political iii
officials), as well as the mass media, have directly contributed to the style and tenor of protest politics in Jamaica. This state of affairs reduces popular citizen participation over genuine concerns to mob-style incivility and undermines civil society as a source of positive and responsible citizenship. The growing political importance of grassroots-based citizen participation and community building within the context of a global imperative to forge 'democracy from below' lends theoretical and normative credence to emerging concerns about the current character of popular citizen mobilizations and protest. This study thus establishes the basis for a presumption in favour of civility, civil discourse and civil action as fundamental to the construction of civil society. In doing so, it extends current scholarly understandings of civil society to Third World contexts, with a specific emphasis on Jamaica.

text: When citizen politics becomes uncivil: Between popular protest, civil society and governance in Jamaica This thesis focuses on the problem of incivility within the domains of citizen politics and civil society by exploring the proclivity for popular protest in Jamaica and the intersections between popular citizen protest, civil society and governance in this context. It scrutinizes the tenor of contemporary civilian politics and assesses the consequent impact on the quality of civil society more broadly. The thesis challenges the assumption within accepted definitions of civil society that civic participation is always positive. It does so by examining the manner in which citizens engage collectively to defend their interests and make claims upon the state, as well as the extent to which this model of political participation serves the agenda and promise of civil society.
Through an in-depth, country-specific, empirical case study, the thesis examines micro social processes of power at community level to raise questions about who should be represented in civil society and how the voices of the marginalized are to be heard. In this regard, it explores the role of social inequality, feelings of social injustice and political exclusion as contributory factors in the existing tenor of citizen politics in Jamaica. It also examines the challenges facing the contemporary state and the impact of violent protests on state engagement, public action and political performance. The study analyses the lived experiences, observations and perspectives of a wide cross section of Jamaican citizens, gleaned from face-to-face interviews, focus group discussions, as well as a range of secondary material, including audio-visual data, to illuminate this process of struggle and underscore the factors which drive violent protests in this political context.
The thesis concludes that maximum disruption, including violence, has not only become the basis of civil protest in Jamaica, but that the varied and contradictory responses of the state bureaucracy and political actors (Members of Parliament, activists, other political iii
officials), as well as the mass media, have directly contributed to the style and tenor of protest politics in Jamaica. This state of affairs reduces popular citizen participation over genuine concerns to mob-style incivility and undermines civil society as a source of positive and responsible citizenship. The growing political importance of grassroots-based citizen participation and community building within the context of a global imperative to forge 'democracy from below' lends theoretical and normative credence to emerging concerns about the current character of popular citizen mobilizations and protest. This study thus establishes the basis for a presumption in favour of civility, civil discourse and civil action as fundamental to the construction of civil society. In doing so, it extends current scholarly understandings of civil society to Third World contexts, with a specific emphasis on Jamaica.

year: 2007

title: Equity of travel required to access first definitive surgery for liver or stomach cancer in New Zealand

authors: Gurney, Jason

subjects: Humans

abstract: In New Zealand, there are known disparities between the Indigenous Māori and the majority non-Indigenous European populations in access to cancer treatment, with resulting disparities in cancer survival. There is international evidence of ethnic disparities in the distance travelled to access cancer treatment; and as such, the aim of this paper was to examine the distance and time travelled to access surgical care between Māori and European liver and stomach cancer patients. We used national-level data and Geographic Information Systems (GIS) analysis to describe the distance travelled by patients to receive their first primary surgery for liver or stomach cancer, as well as the estimated time to travel this distance by road, and the surgical volume of hospitals performing these procedures. All cases of liver (ICD-10-AM 3rd edition code: C22) and stomach (C16) cancer that occurred in New Zealand (2007-2019) were drawn from the New Zealand Cancer Registry (liver cancer: 866 Māori, 2,460 European; stomach cancer: 953 Māori, 3,192 European), and linked to national inpatient hospitalisation records to examine access to surgery. We found that Māori on average travel 120km for liver cancer surgery, compared to around 60km for Europeans, while a substantial minority of both Māori and European liver cancer patients must travel more than 200km for their first primary liver surgery, and this situation appears worse for Māori (36% vs 29%; adj. OR 1.48, 95% CI 1.09-2.01). No such disparities were observed for stomach cancer. This contrast between cancers is likely driven by the centralisation of liver cancer surgery relative to stomach cancer. In order to support Māori to access liver cancer care, we recommend that additional support is provided to Māori patients (including prospective financial support), and that efforts are made to remotely provide those clinical services that can be decentralised.

text: Equity of travel required to access first definitive surgery for liver or stomach cancer in New Zealand In New Zealand, there are known disparities between the Indigenous Māori and the majority non-Indigenous European populations in access to cancer treatment, with resulting disparities in cancer survival. There is international evidence of ethnic disparities in the distance travelled to access cancer treatment; and as such, the aim of this paper was to examine the distance and time travelled to access surgical care between Māori and European liver and stomach cancer patients. We used national-level data and Geographic Information Systems (GIS) analysis to describe the distance travelled by patients to receive their first primary surgery for liver or stomach cancer, as well as the estimated time to travel this distance by road, and the surgical volume of hospitals performing these procedures. All cases of liver (ICD-10-AM 3rd edition code: C22) and stomach (C16) cancer that occurred in New Zealand (2007-2019) were drawn from the New Zealand Cancer Registry (liver cancer: 866 Māori, 2,460 European; stomach cancer: 953 Māori, 3,192 European), and linked to national inpatient hospitalisation records to examine access to surgery. We found that Māori on average travel 120km for liver cancer surgery, compared to around 60km for Europeans, while a substantial minority of both Māori and European liver cancer patients must travel more than 200km for their first primary liver surgery, and this situation appears worse for Māori (36% vs 29%; adj. OR 1.48, 95% CI 1.09-2.01). No such disparities were observed for stomach cancer. This contrast between cancers is likely driven by the centralisation of liver cancer surgery relative to stomach cancer. In order to support Māori to access liver cancer care, we recommend that additional support is provided to Māori patients (including prospective financial support), and that efforts are made to remotely provide those clinical services that can be decentralised.

year: 2022