A novel image reconstruction method applied to deep Hubble Space Telescope Images

We have developed a method for the linear reconstruction of an image from undersampled, dithered data, which has been used to create the distributed, combined Hubble Deep Field images -- the deepest optical images yet taken of the universe. The algorithm, known as Variable-Pixel Linear Reconstruction (or informally as "drizzling"), preserves photometry and resolution, can weight input images according to the statistical significance of each pixel, and removes the effects of geometric distortion both on image shape and photometry. In this paper, the algorithm and its implementation are described, and measurements of the photometric accuracy and image fidelity are presented. In addition, we describe the use of drizzling to combine dithered images in the presence of cosmic rays.Comment: Invited paper, to appear in Applications of Digital Image Processing XX, ed. A. Tescher, Proc. S.P.I.E. vol. 3164, in press; 6 pages, 4 included figures, SPIE LaTex style file include

The View from Elsewhere: A Response

Reviews and responds to the symposium contributors, recounting briefly growing up as a Scot in England and Scotland, and doing National Service, and drawing on 60 years experience studying, researching, and teaching in both Scotland and the United States, commenting that while Scottish studies in the 1960s was primarily concerned with traditional culture and reclaiming a folk tradition, its future probably lies in interdisciplinary study focused on contemporary Scotland and modern Scottish writing

Writing the Highland Tour: A Story of a Deeply Troubling Kind

Review and discussion of Nigel Leask, Stepping Westward: Writing the Highland Tour c.1720-1830 (Oxford: Oxford University Press, 2020), from Burt and Pennant to Dr Johnson, William and Dorothy Wordsworth, and John Keats, praising the book as timely, and suggesting that in discussing attitudes to the people of the Scottish Highlands it tells a story of a deeply troubling kind

Examining modern money creation: an institution-centered explanation and visualization of the “credit theory” of money and some reflections on its significance

Despite recent clarifications by central banks that it is indeed commercial banks that are the main creators of the money supply, money creation processes remain as confusing and opaque as ever to many. This article develops a simplified macro-visual diagram of today’s money system based on the increasingly accepted “credit theory” of money creation. It aims to explain not only how money is created and which institutions have the authority to create it; it also aims to discuss the implications of this understanding of money creation for wider issues, such as political sovereignty, inequality, and socio-economic development. Ultimately, it aims to provide a pedagogical resource upon which both technical and normative discussions about our current money system among academics, activists, and students can be based

Mapping contention: mining property expansion, Amerindian land titling, and livelihood hybridity in Guyana’s small-scale gold mining landscape

A rapid expansion in small-scale gold mining properties over the landscape since the late-2000s has generated new social and environmental pressures for both titled and untitled Amerindian communities in Guyana. Some commentators in Guyana claim that these negative impacts are ‘governance problems’ – related to lapses in the monitoring of mining, a poor application and understanding of existing rules and rights, and delays in the Amerindian land titling process. However, using examples from two Amerindian villages in Guyana and employing extensive spatial Geographic Information Systems (GIS) data, this article shows that these problems are rather rooted in deeper institutional and political biases against Amerindian notions of customary land and the ongoing privileging of mineral interests over other tenure types. The article nevertheless argues that resolving tensions between miners and Amerindian communities over land titling is being hamstrung by the perpetuation of binary framings of these claims according to which they are legitimate only when they are grounded in ‘traditional’ motivations. As a way of moving beyond this impasse, the article suggests recognizing the ‘hybridity’ of indigenous livelihoods and the legitimacy of indigenous participation in mining as necessary steps in re-framing debates on indigenous communities and mining

The political ecology of small-scale gold mining reform in Guyana: resource competition, formal institutions, and green development pathways

This thesis operationalizes a political ecology research programme to examine the different dimensions of environmentally-oriented small-scale gold mining reform within Guyana’s unique mining setting. The study is based on a year of fieldwork in Guyana and employs a mix of spatial, quantitative, and qualitative data – including multiple Geographic Information Systems (GIS) maps, mineral property data, hundreds of secondary documents, three ethnographic site-based case studies, and 143 semi-structured interviews. The research approach examines the small-scale reform agenda in Guyana as a ‘storyline’, enabling a view of the policy agenda as not only embodying structures and institutions, but as also predicated on particular assumptions about social and ecological reality. By highlighting the contrasts between the ways policies are perceived and experienced by a range of actors on the ground with the abstract policy framings, it offers an analysis of the root causes of policy failure, conflict, and economic and social injustice. The thesis identifies a range of powerful (and under-acknowledged) political phenomena in the mining landscape that threaten the legibility, legitimacy, and effectiveness of the reform approach. These phenomena relate to contested local understandings of environmental change; unresolved contentions among poorer miners and indigenous groups over the structural basis of formal titles; emerging forms of market-mediated exclusion; and inherent ‘informality’ amidst intense resource competition, state fragility and remote geographies. The persistence of such phenomena offers a reminder that mining reform is not merely a ‘legal-institutional’ process but an inherently ‘political’ one that entails contestation over how social and ecological relationships are defined and managed. While showing how a political ecology approach enables engagement with a range of normative concerns, this thesis also makes specific contributions to current academic and policy debates on small-scale gold mining governance, offering new insights on patterns of informality, injustice, and exclusion

The political ecology of small-scale gold mining reform in Guyana: resource competition, formal institutions, and green development pathways

This thesis operationalizes a political ecology research programme to examine the different dimensions of environmentally-oriented small-scale gold mining reform within Guyana’s unique mining setting. The study is based on a year of fieldwork in Guyana and employs a mix of spatial, quantitative, and qualitative data – including multiple Geographic Information Systems (GIS) maps, mineral property data, hundreds of secondary documents, three ethnographic site-based case studies, and 143 semi-structured interviews. The research approach examines the small-scale reform agenda in Guyana as a ‘storyline’, enabling a view of the policy agenda as not only embodying structures and institutions, but as also predicated on particular assumptions about social and ecological reality. By highlighting the contrasts between the ways policies are perceived and experienced by a range of actors on the ground with the abstract policy framings, it offers an analysis of the root causes of policy failure, conflict, and economic and social injustice. The thesis identifies a range of powerful (and under-acknowledged) political phenomena in the mining landscape that threaten the legibility, legitimacy, and effectiveness of the reform approach. These phenomena relate to contested local understandings of environmental change; unresolved contentions among poorer miners and indigenous groups over the structural basis of formal titles; emerging forms of market-mediated exclusion; and inherent ‘informality’ amidst intense resource competition, state fragility and remote geographies. The persistence of such phenomena offers a reminder that mining reform is not merely a ‘legal-institutional’ process but an inherently ‘political’ one that entails contestation over how social and ecological relationships are defined and managed. While showing how a political ecology approach enables engagement with a range of normative concerns, this thesis also makes specific contributions to current academic and policy debates on small-scale gold mining governance, offering new insights on patterns of informality, injustice, and exclusion

Cultural linkages and goal consensus: The principal\u27s role in school improvement

Significant interest in educational reform has been accelerated in the past decade by many factors. A combination of national commission reports and various research findings has created, what has been popularly termed, the effective schools movement. The growing occurences of school improvement programs, aimed at improving the effectiveness of schools, has helped to reinforce several key factors that have become accepted as necessary ingredients for effective schools

Navigating implementation dilemmas in technology- forcing policies: A comparative analysis of accelerated smart meter diffusion in the Netherlands, UK, Norway, and Portugal

This paper addresses the implementation of technology-forcing policies in open-ended diffusion processes that involve companies and regulators as well as consumers and civil society actors. Mobilising insights from the societal embedding of technology framework and policy steering theories, we investigate two implementation dilemmas that relate to an overarching tension between flexibility (to enable technological learning and stakeholder engagement) and coordinated push (to focus actors and drive deployment): a) early or late formulation of initial targets, and b) technocratic or emergent-adaptive implementation styles. We investigate these dilemmas with four comparative case studies of smart electricity meters between 2000 to 2019, which diffused rapidly in the Netherlands, Norway, and Portugal, but decelerated in the UK. We relate these differences to policy choices, and identify two patterns for successful implementation of technology-forcing policies: a) start with early targets and a technocratic style, but make adjustments if there are substantial protests or technical problems, and b) start with an emergent-adaptive style and formulate and enforce targets later, once technical and social stabilisation has occurred.publishedVersio