RESILIENCE IN A MOUNTAIN RANGE: THE CASE OF THE TADRART ACACUS (SOUTHWEST LIBYA)
NOMADIC PEOPLES
Authors: Biagetti, Stefano
Abstract
Between 2003-2011, a research programme in southwest Fazzan (Libya) aimed at understanding the resilience of the Kel Tadrart Tuareg, currently inhabiting the Acacus Mts. Using a multi-pronged approach featuring oral interviews, participant observation, mapping of settlements and localisation of natural resources, the Kel Tadrarts' interaction with the landscape was investigated, and traditional (local) ecological knowledge turned out to be a key factor in the successful adaptation of the Kel Tadrart to erratic rainfall and meagre pastures. The study of Kel Tadrart resilience has fostered new interpretation of the recent past of the region, developed under the framework of the Theory of Resilience.
Shock compression of silicon polymer foams with a range of initial densities
SHOCK COMPRESSION OF CONDENSED MATTER - 2003, PTS 1 AND 2, PROCEEDINGS
Authors: Alcon, RR; Robbins, DL; Sheffield, SA; Stahl, DB; Fritz, JN
Abstract
We report here on a collection of shock compression experiments on a silicon polymer foam with varying degrees of distension from low (similar to0.4 g/cm(3)) to the near fully dense material (similar to 1 g/cm 3). These experiments are being carried out on a two-stage gas-gun (50 mm bore) with a Kel-F 81 impactor at velocities between 1.5 and 3.1 km/s. Particle and shock velocity measurements are made with magnetic gauges by inserting the gauge package (0.001 inches thick) between layers of 2.3 mm thick foam. Special attention is required for assembly of these targets due to the foam's low strength. To minimize compression and gaps at interfaces, the foams are positioned between support rings, which are machined to match the foam's thickness. The Hugoniot data from these experiments is compared to unpublished data obtained with explosively driven flyers at Los Alamos National Laboratory in the early 1980's.