982 resultados para EVA, GJS400, Ghisa sferoidale


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The Mary Eva Hite Papers consists of correspondence, speeches, newspaper clippings, family history data, photographs, awards, scrapbooks, and other records relating to Mary Eva Hite’s career as an educator and prominent South Carolina public servant. The photograph file provides a visual record of South Carolina elementary school life in the first half of the twentieth century. Correspondence relates to Dr. Hite’s many career activities, including her 1970 correspondence highlighting her work promoting the welfare of senior citizens. The speeches focus on her work with the aged, her travels abroad, and acceptances for awards presented to her by educational and civic organizations. Newspaper clippings provide information concerning awards presented to Dr. Hite and chronicle the advances in education made by the state of South Carolina. Scrapbooks relate to college friends and Dr. Hite’s work with Delta Kappa Gamma. There are also records relating to teacher retirement in South Carolina.

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The improved workability effect of latex in dry mortars has not been fully clarified. The purpose of this research was to investigate the influence cif the EVA copolymer on the cement hydration and on the rheological properties of cement pastes. The results pointed to a minor influence of EVA on cement hydration and to a ball-bearing effect. In fact, the shear thinning behavior of reference paste at 15 min after mixing changed to shear thickening owing to the EVA addition. This behavior could be explained by the decrease in the interparticle separation distance as consequence of the solid content increase in case of shearing detachment of weakly adhered EVA particles from the cement particles surfaces. The expected EVA plasticizing effect was observed at 60 min. Such behavior points to the stabilization of EVA on the cement particles surfaces, thus resulting in a steric barrier effect. (C) 2011 Elsevier Ltd. All rights reserved.

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The improved workability effect of latex in dry mortars has not been fully clarified. The purpose of this research was to investigate the influence of the EVA copolymer on the cement hydration and on the rheological properties of cement pastes. The results pointed to a minor influence of EVA on cement hydration and to a ball-bearing effect. In fact, the shear thinning behavior of reference paste at 15 min after mixing changed to shear thickening owing to the EVA addition. This behavior could be explained by the decrease in the interparticle separation distance as consequence of the solid content increase in case of shearing detachment of weakly adhered EVA particles from the cement particles surfaces. The expected EVA plasticizing effect was observed at 60 min. Such behavior points to the stabilization of EVA on the cement particles surfaces, thus resulting in a steric barrier effect.

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Studio e progettazione di una stufa a pellet in ghisa per il riscaldamento domestico per generare una potenza termica di 6.5 kW.