Lande: The Calais 'Jungle' and Beyond

Available Open Access under CC-BY-NC licence. How can Archaeology help us understand our contemporary world? This ground-breaking book reflects on material, visual and digital culture from the Calais “Jungle” – the informal camp where, before its destruction in October 2016, more than 10,000 displaced people lived. LANDE: The Calais 'Jungle' and Beyond reassesses how we understand ‘crisis’, activism, and the infrastructure of national borders in Refugee and Forced Migration Studies, foregrounding the politics of environments, time, and the ongoing legacies of empire. Introducing a major collaborative exhibit at Oxford’s Pitt Rivers Museum, the book argues that an anthropological focus on duration, impermanence and traces of the most recent past can recentre the ongoing human experiences of displacement in Europe today.Available Open Access under CC-BY-NC licence. How can Archaeology help us understand our contemporary world? This ground-breaking book reflects on material, visual and digital culture from the Calais “Jungle” – the informal camp where, before its destruction in October 2016, more than 10,000 displaced people lived. LANDE: The Calais 'Jungle' and Beyond reassesses how we understand ‘crisis’, activism, and the infrastructure of national borders in Refugee and Forced Migration Studies, foregrounding the politics of environments, time, and the ongoing legacies of empire. Introducing a major collaborative exhibit at Oxford’s Pitt Rivers Museum, the book argues that an anthropological focus on duration, impermanence and traces of the most recent past can recentre the ongoing human experiences of displacement in Europe today

Formal Type Soundness for Cyclone's Region System

Cyclone is a polymorphic, type-safe programming language derived from C\@. The primary design goals of Cyclone are to let programmers control data representations and memory management without sacrificing type-safety. In this paper, we focus on the region-based memory management of Cyclone and its static typing discipline. The design incorporates several advancements, including support for region subtyping and a coherent integration with stack allocation and a garbage collector. To support separate compilation, Cyclone requires programmers to write some explicit region annotations, but uses a combination of default annotations, local type inference, and a novel treatment of region effects to reduce this burden. As a result, we integrate C idioms in a region-based framework. In our experience, porting legacy C to Cyclone has required altering about 8\% of the code; of the changes, only 6\% (of the 8\%) were region annotations. This technical report is really two documents in one: The first part is a paper submitted for publication in November, 2001. The second part is the full formal language and type-safety proof mentioned briefly in the first part. If you have already read a version of, ``Region-Based Memory Management in Cyclone'', then you should proceed directly to Section 9

Magnetic frustration and spontaneous rotational symmetry breaking in PdCrO2

In the triangular layered magnet PdCrO2 the intralayer magnetic interactions are strong, however the lattice structure frustrates interlayer interactions. In spite of this, long-range, 120$^\circ$ antiferromagnetic order condenses at $T_N = 38$~K. We show here through neutron scattering measurements under in-plane uniaxial stress and in-plane magnetic field that this occurs through a spontaneous lifting of the three-fold rotational symmetry of the nonmagnetic lattice, which relieves the interlayer frustration. We also show through resistivity measurements that uniaxial stress can suppress thermal magnetic disorder within the antiferromagnetic phase.Comment: 9 pages, 9 figure

Heisenberg spins on an anisotropic triangular lattice : PdCrO2 under uniaxial stress

Experiments at the ISIS Pulsed Neutron and Muon Source were supported by a beam time allocation from the Science and Technology Facilities Council under Expt. No. RB1820290. Financial support from the Deutsche Forschungsgemeinschaft through SFB 1143 (Project ID 247310070) and the Max Planck Society is gratefully acknowledged. RW acknowledges funding from the Engineering and Physical Sciences Research Council (EPSRC) Centre for Doctoral Training in Condensed Matter Physics (CDT-CMP), Grant No. EP/L015544/1.When Heisenberg spins interact antiferromagnetically on a triangular lattice and nearest-neighbor interactions dominate, the ground state is 120° antiferromagnetism. In this work, we probe the response of this state to lifting the triangular symmetry, through investigation of the triangular antiferromagnet PdCrO2 under uniaxial stress by neutron diffraction and resistivity measurements. The periodicity of the magnetic order is found to change rapidly with applied stress; the rate of change indicates that the magnetic anisotropy is roughly forty times the stress-induced bond length anisotropy. At low stress, the incommensuration period becomes extremely long, on the order of 1000 lattice spacings; no locking of the magnetism to commensurate periodicity is detected. Separately, the magnetic structure is found to undergo a first-order transition at a compressive stress of ∼0.4 GPa, at which the interlayer ordering switches from a double-to a single-q structure.Publisher PDFPeer reviewe