Christoph Sachße; Florian Tennstedt: Geschichte der Armenfürsorge in Deutschland. Band 2: Fürsorge und Wohlfahrtspflege 1871-1929. Stuttgart: Kohlhammer 1988. 272 S.

A laboratory-scale procedure was developed to obtain lanthanum oxide from spent fluid catalytic cracking catalyst, commonly used in the heavy crude oil process. Two different solids, consisting mainly of silica, alumina, and a certain amount rare earth elements, were leached under several conditions recover earths. Nitric acid leaching lead highest recovery lanthanum, reaching percentage greate...

Stephen Wertheim: Tomorrow, the World. The Birth of U. S. Global Supremacy. Cambridge, MA: Belknap Press Harvard University Press, 2020, 272 o.

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Recensé : Martin Lengwiler, Nigel Penn et Patrick Harries (dir.), Science, Africa and Europe. Processing Information Creating Knowledge, Londres, Routledge, 2020, 272 p.

Translation, by Larry Marks, from Sémantique et recherches cognitives, 2e édition corrigée et augmentée, Presses Universitaires de France, octobre 2001, 272 p.