Modeling of ingot development during the start-up phase of direct chill casting

Direct chill (DC) casting is a core primary process in the production of aluminum ingots. However, its operational optimization is still under investigation with regard to a number of features, one of which is the issue of curvature at the base of the ingot. Analysis of these features requires a computational model of the process that accounts for the fluid flow, heat transfer, solidification phase change, and thermomechanical analysis. This article describes an integrated approach to the modeling of all the preceding phenomena and their interactions.

Macro-segregation of multi-component alloys in shape casting simulation

The objective of this work is to present a new scheme for temperature-solute coupling in a solidification model, where the temperature and concentration fields simultaneously satisfy the macro-scale transport equations and, in the mushy region, meet the constraints imposed by the thermodynamics and the local scale processes. A step-by-step explanation of the macrosegregation algorithm, implemented in the finite volume unstructured mesh multi-physics modelling code PHYSICA, is initially presented and then the proposed scheme is validated against experimental results obtained by Krane for binary and a ternary alloys.

US imperialism in action: An audit-based appraisal of the Coalition Provisional Authority in Iraq

This paper drawing from audit reports reflects upon the post-Iraq war administration the Coalition Provisional Authority (CPA). It argues that the CPA’s compliance with basic levels of decent public administration were akin to Guantanamo’s compliance with basic levels of natural justice. The audit reports demonstrate that the CPA was a chaotic administration which spent billions without proper controls or procedures and left precious Iraqi oil revenues open to fraudulent acts. The CPA failed to comply with its obligations under UN resolutions. It identifies the geopolitical/economic implications of the US government which was partly motivated by economic concerns but it was also motivated by political concerns—the imposition of US hegemony. It then turns to the broader economic imperatives of the falling rate of profit and the imposition of neoliberalism (market fundamentalism).

Sustainability and local tourism branding in England's South Downs

This paper reports on a stakeholder consultation exercise that examined the tourism industry's perception of developing a local tourism branding scheme within the South Downs' protected areas in south-east England. The research shows that such schemes could offer potential benefits that are recognisable by the tourism industry, while helping to meet the statutory aims of the protected area. The paper records the perceptions of small tourism businesses, their fears, awareness of tourism impacts, perceptions of sustainable tourism and of local branding, and key criteria connected to the future organisation of a local tourism branding scheme. The conclusion lists the recommendations for the implementation of a local branding scheme, including grassroots stakeholder consultation that encourages ownership and participation, institutional frameworks that support capacity-building and the importance of developing core values within a local brand.