118,980 research outputs found
Équilibre minéral et santé par J. Favier
No full textBlanchard L. Équilibre minéral et santé par J. Favier. In: Bulletin de l'Académie Vétérinaire de France tome 105 n°4, 1952. pp. 123-125
Innovative adsorbent materials for reactive capping of contaminated marine sediments
No full textLo sviluppo di attività costiere antropogeniche ha portato alla contaminazione dei sedimenti marini con sostanze pericolose, con gravi rischi per la salute e il benessere dell'uomo e dell'ambiente. È di fondamentale importanza sviluppare tecnologie sostenibili per il trattamento simultaneo di diversi contaminanti, fornendo una soluzione permanente per ridurre la pericolosità dei sedimenti negli ambienti acquatici.
Recentemente, i nanomateriali stanno guadagnando terreno nel settore della bonifica, quindi sorge la necessità di svilupparne di sempre nuovi in materia di sostenibilità. I materiali che contengono sostanze naturali o rifiuti come precursori sono i candidati ideali.
Questo studio mirava a sviluppare materiali sostenibili per la bonifica dei sedimenti marini contaminati. La sintesi dei materiali comporta l'ossidazione dei precursori (cellulosa) con 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO), acidificazione e ramificazione con polietilenicina ramificata (bPEI) e congelamento durante la notte. Il metodo migliore per ottenere questo materiale è stato individuato tra liofilizzazione, estrattore Soxhlet o una combinazione di entrambi. L'estrattore Soxhlet utilizzando l'etanolo come solvente è stato il modo migliore in termini di tempo e resa ed è stato utilizzato per ottenere il materiale a base di chitina. Dopo essere stati caratterizzati chimicamente e microstruturalmente, i materiali ottenuti sono stati sottoposti a prove di adsorbimento con tre traccianti organici: Blu Metilene, 4-Nitrobenzaldeide e 4-Nitrofenolo, e due metalli pesanti: Cromo e Cadmio.
Tutti gli esperimenti sono stati implementati con l'analisi LCA per verificarne l'impatto ambientale.The development of anthropogenic coastal activities has led to the contamination of marine sediments with hazardous substances, posing serious risks to the health and well-being of humans and the environment. It is of paramount importance to develop sustainable technologies for the simultaneous treatment of different contaminants, providing a permanent solution to reduce the hazardousness of sediments in aquatic environments.
Recently, nanomaterials are gaining ground in the remediation sector, so the need arises to develop ever-new ones concerning sustainability. Materials that have natural substances or waste as precursors are ideal candidates.
This study aimed to develop sustainable materials for the remediation of contaminated marine sediments. The synthesis of the materials involves oxidation of the precursors (cellulose) with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO), acidification and branching with branched polyethyleneimine (bPEI), and freezing overnight. The better method to obtain this material was individuated between freeze-drying, Soxhlet extractor or a combination of both. A Soxhlet extractor with ethanol as solvent was the best way in terms of time and yield and it was used to obtain the chitin-based material. After being chemically and microstructurally characterized, the materials obtained was subjected to adsorption tests with three organic tracers: Methylene Blue, 4-Nitrobenzaldehyde and 4-Nitrophenol, and two heavy metals: Chromium and Cadmium.
All the experiments were implemented with LCA analysis to evaluate the environmental impact
Total plasma carotenoids and mortality in the elderly: results of the Epidemiology of Vascular Ageing (EVA) study
No full textCarotenoids are pigments found in fruits and vegetables. While high intakes of fruits and vegetables have been found to be associated with lower mortality, our objective is to investigate if total plasma carotenoids, via their antioxidant properties. are associated with mortality risk in a free-living elderly population. The 'Epidemiology of Vascular Ageing' (EVA) study (n 1389 59-71 years) is a 9-year longitudinal study with six waves of follow-up. The association between baseline total plasma carotenoids and mortality was determined by Cox proportional hazards regression analyses. Low total plasma carotenoid level was significantly associated with all-cause mortality in men but not in women. After controlling for potential confounding factors, mortality risk increased significantly in men (P=0.03) with plasma carotenoids in the lowest quintile compared with men with plasma carotenoids in the highest (relative risk 2.94 (95 % CI 1.21, 7.17)). A significant association between mortality by cancer and low plasma carotenoid level variable was also found in men (unit = 1 mu mol/l; relative risk 1.72 (95 % CI 1.02, 2.86); P=0.01). Associations between total plasma carotenoids and mortality risk remained statistically significant after taking into account: (1) plasma Se level, which previously was found associated with mortality in this population and (2) thiobarbituric acid-reactive substances level considered as an indicator of oxidative stress. By showing, prospectively, in a general healthy elderly population, that total plasma carotenoid levels were independently associated with mortality risk in men, the present study suggests that total plasma carotenoid levels could be a health indicator in elderly populations
Pathogénicité résiduelle d’une souche de virus de la stomatite vésiculeuse contagieuse (Indiana) de culture cellulaire II. — Infections humaines au laboratoire
No full textJoubert L., Fédida Maurice, Prave Michel, Favier Colette, Peillon Myriam. Pathogénicité résiduelle d’une souche de virus de la stomatite vésiculeuse contagieuse (Indiana) de culture cellulaire. II. Infections humaines au laboratoire. In: Bulletin de l'Académie Vétérinaire de France tome 126 n°3, 1973. pp. 129-133
Constrained tensor models - Applications to MIMO wireless communication systems
No full textConférence invitéeNational audienceAu cours de la dernière décennie, les modèles tensoriels du type CP, appelés aussi décompositions PARAFAC, ont fait l’objet de très nombreuses applications en traitement du signal et de l’image. Depuis les travaux de pionnier de Sidiropoulos, Giannakis et Bro, en 2000 [1], les communications numériques constituent un domaine d’application privilégié des outils tensoriels. Cet exposé a pour objectif de montrer comment la conception de différents systèmes de communication MIMO a abouti au développement de nouveaux modèles tensoriels avec contraintes. Dans une première partie, différents modèles tensoriels seront présentés de façon unifiée, i.e. les modèles de types Tucker, PARALIND/CONFAC et PARATUCK [2]. Puis, dans une deuxième partie, nous décrirons quatre exemples de systèmes MIMO conduisant à de nouveaux modèles tensoriels contraints pour les tenseurs de signaux reçus: Systèmes CDMA/TST avec codage spatio/temporel tensoriel et allocation de ressources [3]; Systèmes OFDM/STF avec codage/étalement spatio/temporel/fréquentiel et allocation de ressources [4]; Systèmes NL-CDMA avec codage non linéaire [5]; Systèmes coopératifs avec antennes relais et codage spatio/temporel à la source [6].Nous montrerons comment ces modèles tensoriels permettent d’estimer de façon conjointe et semi-aveugle les symboles transmis et les canaux de communication. Des résultats de simulations seront présentés pour illustrer les performances de ces systèmes de communication.[1] SIDIROPOULOS N., GIANNAKIS G., BRO R. (2000), "Blind PARAFAC receivers for DS-CDMA systems" IEEE Transactions on Signal Processing, 48 (3): 810-822, March 2000.[2] FAVIER G., de ALMEIDA A., "Constrained tensor models with applications to MIMO communication systems", to be published.[3] FAVIER G., da COSTA M., de ALMEIDA A., ROMANO J.M., "Tensor space−time (TST) coding for MIMO wireless communication systems" Signal Processing, Elsevier, 92:1079−1092, April 2012.[4] de ALMEIDA, FAVIER G., XIMENES L. (2013), "Space-time-frequency (STF) MIMO communication systems with blind receiver based on a generalized PARATUCK2 model" IEEE Transactions on Signal Processing, Accepted for publication.[5] FAVIER G., BOUILLOC T., de ALMEIDA A. (2012) "Blind constrained block−Tucker2 receiver for multiuser SIMO NL−CDMA communication systems", Signal Processing, Elsevier, 92 (7):1624−1636, July 2012.[6] XIMENES L., FAVIER G., de ALMEIDA A., SILVA Y. "PARAFAC-PARATUCK based blind receivers for dual-hop cooperative MIMO relay systems", to be published
Deux volontaires de 1791. Les frères Favier de Montluçon. Journal et lettres publiés d'après des papiers de famille par L. Duchet, 1909
No full textCaron Pierre. Deux volontaires de 1791. Les frères Favier de Montluçon. Journal et lettres publiés d'après des papiers de famille par L. Duchet, 1909. In: Revue d'histoire moderne et contemporaine, tome 13 N°3,1909. pp. 357-358
Deux volontaires de 1791. Les frères Favier de Montluçon. Journal et lettres publiés d'après des papiers de famille par L. Duchet, 1909
No full textCaron Pierre. Deux volontaires de 1791. Les frères Favier de Montluçon. Journal et lettres publiés d'après des papiers de famille par L. Duchet, 1909. In: Revue d'histoire moderne et contemporaine, tome 13 N°3,1909. pp. 357-358
L’administration publique face aux risques naturels dans les Alpes italiennes : le cas de Livigno (Lombardie)
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
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