Thermal Evolution of the Proton Irradiated Structure in Tungsten–5 wt% Tantalum

We have monitored the thermal evolution of the proton irradiated structure of W–5 wt% Ta alloy by in-situ annealing in a transmission electron microscope at fusion reactor temperatures of 500–1300 °C. The interstitial-type a/2 dislocation loops emit self-interstitial atoms and glide to the free sample surface during the early stages of annealing. The resultant vacancy excess in the matrix originates vacancy-type a/2 dislocation loops that grow by loop and vacancy absorption in the temperature range of 600–900 °C. Voids form at 1000 °C, by either vacancy absorption or loop collapse, and grow progressively up to 1300 °C. Tantalum delays void formation by a vacancy-solute trapping mechanism

Remembrance and Resurrection: Ry Cooder's Chavez Ravine

This article explores Los Angeles guitarist Ry Cooder’s project to excavate and resurrect through music the lost community of Chávez Ravine, the vibrant Mexican‐American neighbourhood bulldozed in 1958 to make way for the construction of the Dodger baseball stadium. The article draws critical parallels with Marcel Proust, of whom Hannah Segal writes: “On realizing the destruction of a whole world that had been his he decides to write, to sacrifice himself to the re‐creation of the dying and the dead. By virtue of his art he can give his objects an eternal life in his work”. Proust’s medium is the written word; Cooder’s is the dance music of the Pachucos, the corridos of the Ravine’s local heroes and the laments of the residents driven away by the bulldozers. Through this music, Cooder’s aim is to ensure that the name “Chávez Ravine” and “all the images that had been living in it” (Proust) will not remain eclipsed by the corporate power and self‐congratulation of the Los Angeles Dodgers