432 research outputs found
Heterogeneous photocatalytic removal of U(VI) in the presence of formic acid: U(III) formation
No full textThe efficiency of TiO2 heterogeneous photocatalysis under UV-visible light for removal of uranyl (UO22+) (0.25mM, pH 3) in the presence of formic acid (HCOOH) was investigated. The effect of the counterion of the uranium salt (perchlorate and acetate-nitrate) and the use of quartz and glass photoreactors were analyzed. The transformation of U(VI) in the presence of HCOOH was significantly high and the best removal conditions have been established. The highest efficiency was observed for uranyl perchlorate in the quartz photoreactor with 0.001M HCOOH, while uranyl acetate yielded a lower removal. HCOOH concentrations >0.01M provoked uranium reoxidation. U(VI) photocatalytic transformation was also studied by direct spectrophotometry using TiO2 nanoparticles in the presence of 1M HCOOH at pH<2. U(V), U(IV) and U(III) were detected. U(III) formation was also apparent in the absence of the photocatalyst. This is the first time that formation of U(III) in a photochemical U(VI) system is reported.Fil: Salomone, Vanesa Natalia. Comisión Nacional de Energía Atómica. Gerencia del Área de Seguridad Nuclear y Ambiente. Gerencia de Química (CAC); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Meichtry, Jorge Martin. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Seguridad Nuclear y Ambiente. Gerencia de Química (CAC); ArgentinaFil: Litter, Marta Irene. Comisión Nacional de Energía Atómica. Gerencia del Área de Seguridad Nuclear y Ambiente. Gerencia de Química (CAC); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental; Argentin
La redazione cristiana del Testamento di Salomone
No full textIn questo studio si riesaminano i vari livelli redazionali del Testamento di Salomone, pseudepigrafo sinora non molto studiato, in cui si narra come Salomone sia stato aiutato da alcuni demoni nell'edificazione del tempio di Gerusalemme. Il testo ha avuto una fase compositiva e redazionale complessa, in cui si sono sovrapposte componenti giudaiche e cristiane. Sono qui presi particolarmente in considerazione alcuni elementi del lessico e, per quanto riguarda temi e contenuti, sono esaminate le riscritture del testo biblico (particolarmente di 1Re 4, 29-12, 24) e i rapporti con la letteratura cristiana antica, di cui l'autore mostra di avere buona conoscenza.The Testament of Solomon (TS) is a Greek pseudepigraphon recounting how King Solomon was helped by some demons to build the Jerusalem Temple. The story deeply reworks 1 Kings 4, 29-12, 24 and displays all the features of the ‘Rewritten Bible’. In the complex textual tradition of TS, various redactional
levels can be detected, both Jewish and Christian. It seems that its textual nucleus, including some demonological and magical materials, originated in Jewish traditions; nonetheless, in its full redaction the text is certainly Christian. The aim of the present study is to show how the vocabulary and concepts shared by TS with the New Testament cannot be ascribed just to the same linguistic background, or to traditions received orally, but that the Christian author had a direct and good knowledge at least of the Synoptic Gospels
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