12 research outputs found
Thermal Evolution of the Proton Irradiated Structure in Tungstenâ5 wt% Tantalum
We have monitored the thermal evolution of the proton irradiated structure of Wâ5 wt% Ta alloy by in-situ annealing in a transmission electron microscope at fusion reactor temperatures of 500â1300 °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 600â900 °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 Cooderâs project to excavate and resurrect through music the lost community of ChĂĄvez Ravine, the vibrant MexicanâAmerican 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: âOn realizing the destruction of a whole world that had been his he decides to write, to sacrifice himself to the reâcreation of the dying and the dead. By virtue of his art he can give his objects an eternal life in his workâ. Proustâs medium is the written word; Cooderâs is the dance music of the Pachucos, the corridos of the Ravineâs local heroes and the laments of the residents driven away by the bulldozers. Through this music, Cooderâs aim is to ensure that the name âChĂĄvez Ravineâ and âall the images that had been living in itâ (Proust) will not remain eclipsed by the corporate power and selfâcongratulation of the Los Angeles Dodgers