The Application of the Newman-Janis Algorithm in Obtaining Interior Solutions of the Kerr Metric

In this paper we present a class of metrics to be considered as new possible sources for the Kerr metric. These new solutions are generated by applying the Newman-Janis algorithm (NJA) to any static spherically symmetric (SSS) ``seed'' metric. The continuity conditions for joining any two of these new metrics is presented. A specific analysis of the joining of interior solutions to the Kerr exterior is made. The boundary conditions used are those first developed by Dormois and Israel. We find that the NJA can be used to generate new physically allowable interior solutions. These new solutions can be matched smoothly to the Kerr metric. We present a general method for finding such solutions with oblate spheroidal boundary surfaces. Finally a trial solution is found and presented.Comment: 11 pages, Latex, 4 postscript figures. To be published in Classical and Quantum Gravity. Title and abstract are now on the same pag

A Dual Experimental/Numerical Approach for Film Thickness Analysis in TEHL Spinning Skewing Circular Contacts

International audienc

Defence Restructuring and Local Policies. The Case of Taranto, a Military Port on the Mediterranean Sea

International audienceTwo concurrent changes are raising questions about the interplay between armed forces and local governments in contemporary urban settings. The first one is the spatial reorganisation of armed forces that has been taking place in most European countries since the end of the Cold War. The second one is the redistribution of political authority between levels of governments that has increased the relevance of cities and transformed urban governance. The chapter conceptualises the military administration as an urban actor, whose material and symbolic resources in cities transform over time. It investigates both the effects of a (changing) military presence on urban policies, and how those changes are framed and managed by local governments. The case under consideration is the city of Taranto (Southern Italy), one among the biggest military ports on the Mediterranean Sea. Here, transformations of defence policies opened a window of opportunity for a new urban policy agenda, whose goal is a partial differentiation from military activities. During the last ten years, local political elites have been undertaking several strategies for military spaces redevelopment. However, uneven power relations prevent civilian-military bargain: redevelopment strategies are the result of either local military initiative or central State decisions

Who Makes the (New) Metropolis? Cross-Border Coalition and Urban Development in Paris

In fragmented agglomerations, urban development in peripheral areas tends to express the hegemony of the core city over its suburbs. However, this paper demonstrates that, despite deep-rooted political conflicts, intermunicipal cooperation can still take place in the context of cross-border development. I argue that cross-border development has a political and economic logic that is driven by a different power configuration in the metropolis: cross-border coalitions. These coalitions emerge when the redevelopment of areas around municipal borders provides an opportunity for political interests to strengthen their electoral alliances and for business interests to exploit possibilities of growth. This paper investigates urban development in Paris North East, an area on the periphery of Paris that crosses municipal boundaries. It examines how a coalition of public and private actors is cooperating based on the shared benefits they can derive from developments in this area. The case study captures the complex political and economic dynamics driving intermunicipal cooperation by examining the role of local political coalitions, their link with planning agencies, and the behavior of emergent metropolitan entrepreneurs