Search results for "REM"
showing 10 items of 11264 documents
Experimental investigation on the efficiency of zinc(II) recovery from waste streams by TBP liquid-liquid extraction
2016
In many industrial processes the presence of zinc in the wastewater may represent an obstacle to its high efficient regeneration. This is the case of the treatment of spent pickling solutions aiming the recovery of hydrochloric acid via pyrohydrolysis techniques. Hydrochloric spent pickling solutions from steel processing contain relevant amount of metals such as iron (Fe) and zinc (Zn) that may significantly affect recovery of hydrochloric acid (HCl) through pyrohydrolysis. In fact, although Fe may be recovered as ferric oxide (Fe2O3) and does not have a substantial effect on pyrohydrolysis process, zinc chloride (ZnCl2) evaporating can occlude nozzles and stick to the pyrohydrolysis react…
Recovering of zinc(II) from spent pickling solutions by liquid-liquid extraction
2015
Hydrochloric acid can be successfully recovered from spent pickling liquors with high efficiencies via pyrohydrolysis techniques. In the pickling solution feed, other metallic ions are typically present besides iron (mainly Fe2+) such as zinc(II). In order to avoid undesirable effects, zinc(II) has to be removed, because zinc chloride evaporates and sticks to the reactor walls, as well as it contaminates iron oxides product1. Moreover, zinc recovery is economically affordable because it allows the marketing of some products such as ZnCl2 and ZnSO4. In the present work, liquid-liquid extraction process has been selected to recover zinc(II) from pickling liquors, using suitable extractant age…
La sépulture à char de La Tène A ancienne des “Craises” à Molinons (Yonne)
2013
The study reports on a chariot tomb excavated in 1985 at Les Craises in Molinons (Yonne). Set in an adventitious position in the midst of a monument with three quadrangular enclosures, the grave was of an adult of undetermined sex. Despite later pillaging, the goods found in this aristocratic tomb permit a dating to the second quarter of the 5th century BC, and an unusual cultural attribution, on the frontier in the Parisian Basin between the Jura culture to the south and the Marne-Moselle culture to the north.
L'économie matérielle de la France (1830-2015). L'histoire d'un parasite ?
2018
This article explores the long-term dynamics of material use in France over a period of 185 years. It is based on material flow accounts that are perfectly consistent with the standards of Material Flows Analysis at the national economic scale. This work - which covers domestic extraction, imports and exports - is the first long-term study of material flows for France, with annual and national data for most of the period. Our database allows us to study the evolution of French metabolism during the industrialization of the country, together with the increasing dependence on abiotic materials. We highlight a singular metabolic trajectory: that of a state that benefits from successive world-s…
Introduire un dispositif de renforcement disciplinaire en 1ère année universitaire permet-il aux étudiants d'obtenir de meilleures notes ?
2014
Avec le Plan Réussite en Licence (PRL), de nouveaux dispositifs d'aides à la réussite ont été expérimentés au sein des universités françaises. Or, l'étude de l'efficacité de ces dispositifs demeure peu développée, mis à part la méthodologie du travail universitaire (Coulon, 2005) ou le tutorat (Danner, 2000). Il est ainsi difficile d'identifier quel type de mesure semble le plus approprié pour agir le plus efficacement sur la réussite des étudiants, ne serait-ce que parce que peu de recherches se concentrent sur les questions d'apprentissage dans l'enseignement supérieur français (Fave-Bonnet et Clerc, 2001). L'ambition de cette communication est de mesurer les effets d'un nouveau type de d…
Les remparts de Bibracte. Recherches récentes sur la Porte du Rebout et le tracé des fortifications
1999
178 fig. + 2 plans dépl., rés. en fr. (p. 7), angl. (p. 9), allem. (p. 10-11), bibliogr. p. 311-316.
Expérimentations techniques à Lavau : mécanisation, relevés et prélèvements
2022
Le site du Moutot à Lavau (Aube), fouillé sur 2 hectares par l’Inrap en 2014-2015, correspond à un complexe funéraire monumental occupé à plusieurs reprises, entre le Hallstatt A1 et la fin de l’Antiquité. Il se caractérise d’abord par sa stratigraphie, obligeant à un décapage délicat et au relevé de grandes longueurs de coupe. La conservation partielle de plusieurs élévations tumulaires a permis l’appréhension des pratiques et de l’architecture funéraires sur le temps long. De manière inattendue, la fouille a permis de documenter une exceptionnelle tombe princière du Ve siècle avant notre ère, dont l’étude a nécessité une adaptation technique et méthodologique constante. Fouille de longue …
Les restes animaux du fossé gaulois de Beauvais "Les Aulnes du Canada" (Oise)
1990
http://www.persee.fr/web/revues/home/prescript/article/pica_0752-5656_1990_num_3_1_1613; National audience
“I Like to Keep my Archaeology Dead”. Alienation and Othering of the Past as an Ethical Problem
2019
As archaeologists, we have to deal with the dead, and as David Clarke once said, we like to keep our archaeology dead. From an epistemological perspective, alienation from the dead seems almost inevitable; otherwise, we would only project today’s conditions onto the past. Therefore, the past must be, and must remain, a foreign country. These alienating processes have ethical implications, however, especially when it comes to the study of human remains. In this article, we analyze the structures within the scientific discipline of archaeology that normalize practices, such as the labeling of human bone material during excavations and the object-like display of skeletons in museums. We argue …
Nuevos elementos de análisis sobre 'Onoba' (Huelva)
2003
En este trabajo se dan a conocer los resultados de la intervención arqueológica en un solar de la calle Arquitecto Pérez Carasa de Huelva, en la que se documentó una estructura doméstica de época romana. El abandono de esta edificación, paralela a la amortización por la misma época de otras construcciones públicas romanas en Huelva, nos lleva a plantear que estos cambios pudieran tener su origen en un cambio de estatuto jurídico de la ciudad en época flavia y con una reforma urbana después de acceder al rango de municipium.