DerechosHumanoeInversiones.docx

Artículo de Rodrigo Uprimny Yepes

Proper heat treatment of steels is one of the most important factors in determining how they will perform in service. Engineering materials, mostly steel, are heat treated under controlled sequence of heating and cooling to alter their physical and mechanical properties to meet desired engineering applications. In this study we have chosen AISI 1020 steel as for our research work and we have tried to find out the mechanical properties (hardness) and micro structural properties by means of appropriate heat treatment process (annealing, normalizing & quenching). Here the steel specimens were heat treated in a furnace at different temperature levels and soaking time; and then cooled in various media (furnace, air, water, oil, and brine). After that the hardness of the specimens were rechecked for the comparison with previous data and the microstructures of the specimens were examined using metallurgical microscope equipped with camera. These results showed that the hardness of AISI 1020 steel can be changed and improved by different heat treatments for a particular application. From the microstructures we have found that the annealed specimens with mainly ferrite structure give the lowest hardness value and highest ductility while quenched specimens give the highest hardness value and lowest ductility. On the other hand, normalized specimens have given the moderate hardness and ductility comparing with hardened and annealed specimens.

Public Culture, 2024

This article examines the art practice of a group of professors and students—who later came to be known as Group 57—at the Fine Arts College of the University of Tehran during the revolutionary period of 1978 to 1980. Through interviews with artists and art historical research, the authors describe the artists’ workshop where they produced posters against the Shah, the United States, and imperialism. Their posters drew on the bold colors, clear text, symbolic imagery, and easy reproducibility of international radical poster art and the early Russian revolutionary avant‐garde. The authors recover these aesthetic and intellectual connections in the academic and professional training of the artists and in the art historical context of the posters themselves, examining the posters’ recent and more distant influences, and reinscribing the artists in the history of Iranian art and international art history. The authors also point toward connections between Group 57 and protest art in Iran today.

Toscana ebraica 37, 4, 2024

una polemica cinquecentesca sulle donne