1,017 research outputs found
Gli archivi dellʼamministrazione centrale del Regno di Sardegna tra XIV e XV secolo: testimonianze documentarie ed ipotesi di lavoro
No full textL’articolo si pone l’obiettivo di analizzare e ricostruire la politica archivistica aragonese nel Regno di Sardegna, in un arco cronologico che va dal XIV al XV secolo, attraverso lo studio delle fonti documentarie coeve. La conquista del regno negli anni 1323-1324 comportò la riorganizzazione amministrativa dell’isola, con la conseguente creazione di nuovi presidi archivistici. Attestato dal 1327, l’archivio reale del Castello di Cagliari ricevette una sede permanente nel 1332. Dichiarato segreto nel 1334, era l’archivio generale del regno, posto sotto il controllo del maestro razionale di Barcellona e del suo luogotenente in Sardegna, con competenze in materia fiscale. Ma questo non fu l’unico archivio del governo centrale dell’isola: nel 1359 Pietro IV d’Aragona assegnò una sede adeguata alla scrivania dell’Amministrazione generale e al suo archivio, il quale nel XV secolo passò sotto la giurisdizione della Procurazione reale, magistratura cui competeva la conduzione della politica economica dell’isola. Infine, nel 1480 Ferdinando II il Cattolico istituì l’ufficio in capite del maestro razionale di Sardegna e il suo archivio. Questi importanti complessi documentari formarono il nucleo attorno al quale si sarebbe costituito il Regio archivio patrimoniale spagnolo e, in seguito, l’archivio sabaudo. Ciò che principalmente si vuol mettere in risalto nell’articolo è la straordinaria attenzione che la Corona d’Aragona manifestò nei confronti della conservazione documentaria, riconoscendo in essa uno strumento indispensabile per il buon governo e la salvaguardia del patrimonio regio.In this article the author examines and reconstructs the Aragonese archival policy in the Kingdom of Sardinia between the 14th and the 15th centuries, through the study of the coeval documentary sources. The conquest of this kingdom in the years 1323-1324 caused the reorganization of the administration of the island, with the consequent creation of new archives. In that time the Crown of Aragon showed a big care to the preservation of the documents. Attested since 1327, the royal archive of the Castle of Cagliari got a permanent home in 1332. Declared secret in 1334, it was general archive of the kingdom, under the control of the magister racionalis of Barcelona or his lieutenant in Sardinia, with competences in fiscal matters. But this one was not the unique archive of the central government of Sardinia: in 1359 Peter IV of Aragon gave a suitable location to the office of the scribe of the General Administration and to its archive (from 1413 archive of the procurator regius Regni Sardinie), for preserving there the documentation of the Crown Estate in the Kingdom of Sardinia. In the year 1480 Ferdinand II the Catholic established the office of the magister racionalis Sardinie and his archive
Metallation Reactions. XXI. Metallation of Methyl(methylthio)benzenes by Superbases versus Organolithium Compounds
No full textSoil decontamination at the Montevecchio-Levante Mine site with exsperimental washing and leaching techniques
No full textThe soils in the neighbourhood of the Rio Montevecchio-Sitzerri, a stream that flows in the valley below the tailings pond of the Montevecchio-Levante mineral processing plant (SW Sardinia, Italy) are severely contaminated by heavy metals, to the extent that traditional land uses are compromised. Consequently urgent measures are needed both to abate the pollution at source and rehabilitate the contaminated land. This paper is concerned with the problem of soil decontamination using washing and leaching techniques. Laboratory experiments have been conducted in mechanically agitated reactors, using citric acid and acetic acid solutions and brine of hydrochloric acid and calcium chloride. The influence of both reagent concentration and solid-to-liquid ratio has been assessed, and in the most significant cases, the attack kinetics has been determined. The tests showed the brine to be the most effective for removing metals from the soils. Based on the findings of the investigations, the possibility of decontamination by heap leaching has been simulated in the laboratory using the column technique
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No full textRERCI is owned and managed by the Society for Economic Research on Copyright Issues (SERCI), and it is published in two issues each year. Each author of the papers published in this journal retains copyright in his/her work. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from SERCI and the author of each reproduced paper
Investigations on the possibility of heavy metal immobilization in soils contaminated by mining activities
No full textA variety of technologies is available for the environmental remediation of soils contaminated by mining activity. These methods consist in removing contaminants by means of in-situ or ex-situ processes (soil-washing, physical separation, phytoremediation, leaching, etc.) or in immobilizing metals so as to minimise their release into the environment. Here the possibility is explored of applying metal immobilization techniques to soils severely contaminated by heavy metals in land down-valley from the tailings pond of the Montevecchio-Levante mine in SW Sardinia (Italy). The results of tests on low value materials such as ore processing wastes demonstrated the immobilization ability of "red muds", bauxite ore processing waste, and fly-ash produced by coal fired power stations. The main features of a site set up for pilot tests under natural climatic conditions are described
SEA SALT UPGRADING
No full textThe paper is concerned with the results of an investigation carried out to explore the possibilities of using attrition cells as an alternative to the current vat system used in the S. Antioco salt works in SW Sardinia for the production of washed sea salt. Laboratory tests were conducted varying the operating parameters residence time in the attrition cells and in the centrifuge, solid/brine ratio; number of revolutions per minute of the mechanical stirrer. The results obtained justify the proposal for setting up a pilot plant for their verification and for determining the influencing parameters for industrial design and scale u
Beneficiation of gold bearing ores associated with the tertiary volcanism in South Sardinia (Italy)
No full textBeneficiation of the epithermal gold mineralizations associated with an extensive alteration zone in the Serrenti-Furtei region on the island of Sardinia, is proving a complex issue. Experimental investigations have in fact demonstrated that while the ores contained in the upper parts of the deposit are amenable to conventional cyanidation, the gold contained in the refractory ores in the lower portions needs to be recovered by means of flotation, combined with leaching where necessary.
The results of commercial heap leaching, carbon-in-leach (CIL) processing and flotation, designed on the basis of the experimental findings and applied to the oxidized portions and transition zones of the deep sulphide mineralizations, confirmed the expectations emerging from the laboratory test
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