1,374,480 research outputs found
The electrochemistry of the leaching reactions in the Caron process II. Cathodic processes
No full textThe cathodic reactions which are involved in the dissolution of iron alloys in solutions typically used in the Caron Process have been investigated by electrochemical methods. The results have confirmed that cobalt(III) ammine complexes are the main oxidising agents but also highlight the important role of thiosulfate. A solid product is deposited on platinum as well as iron electrodes below -0.75 V/SCE and oxidised at more positive potentials. The product is either Ni or Co metal in the absence of thiosulfate or a metal sulfide when thiosulfate is present. The rate of reactions in the presence of thiosulfate is significantly greater than its absence. The probable chemical reactions taking place during leaching in the Caron Process have been revised on the basis of these observations
An electrochemical investigation of the formation of CoSx and its effect on the anodic dissolution of iron in ammoniacal-carbonate solutions
No full textIt has been found that the co-presence of cobalt (II) and thiosulphate ions in ammoniacal-carbonate solutions promotes the passivation of iron, under conditions in which it would otherwise continue to dissolve anodically. Electrochemical experiments have shown a relationship between the immersion time required for passivation and the formation of a solid species on the iron surface, which is thought to be implicated in the mechanism of passivation, whilst not being itself the protective species. Based on a combination of electrochemical, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and grazing incidence X-ray diffraction (GIXRD) characterisation techniques, the said species has been identified as CoSx, resulting from the interaction of cobalt (II) and thiosulphate ions. It is thought to form as a product of the cathodic reactions taking place on the iron surface during its active dissolution.
These findings are particularly relevant to the Caron process, in which the ammoniacal-carbonate solutions containing dissolved cobalt and thiosulphate ions are used to leach nickel and cobalt from pre-reduced laterite ores rich in metallic iron. Both the loss of cobalt into the CoSx layer and the passivation of iron and of its alloys with nickel and cobalt, are potential contributing factors to the low cobalt and nickel recoveries, which are typical of the Caron process. This study provides a better understanding of the conditions under which the CoSx layer forms and promotes the passivation of iron, and may therefore provide useful information to help minimise the effect this may have on the extraction efficiency of the process. In particular, at the cobalt and thiosulphate ion concentrations usually encountered at a Caron plant, the passivation of iron was found to be prevented by maintaining a high enough concentration of ammonia
Gastrisus punctatus Chatzimanolis & Caron, 2016, sp. n.
No full textpunctatus species group This group includes the following species: X. cordovensis Bernhauer, X. davidi Chatzimanolis sp. n., X. excellens (Bernhauer) comb. n., X. punctatus (Sharp) comb. n., and X. pycnos Chatzimanolis sp. n. The treatment of X. cordovensis by Caron et al. 2016 was sufficient and no updates are provided below. Diagnosis. Species in this group can be distinguished from species in the analis group by the combination of the following characters: microtrichiae on antennae starting on antennomere 4; labial palpi 3 truncate, slightly dilated and oblique [but not securiform as in Dysanellus or Zackfalinus Chatzimanolis]; pronotum with many rows of medium/small punctures; porose structure absent on sternite VII; paramere with peg setae in a pair of rows.Published as part of Chatzimanolis, Stylianos & Caron, Edilson, 2016, New species and synonymies in Xenopygus Bernhauer (Coleoptera: Staphylinidae: Staphylinini), pp. 131-142 in Zootaxa 4200 (1) on page 133, DOI: 10.11646/zootaxa.4200.1.5, http://zenodo.org/record/17783
Communication et culture mobile. Les usages sociaux du cellulaire auprés des jeunes: identité, culture et relations sociales
No full textRicerca condotta all'interno del Programma-quadro di collaborazione Alma Mater Studiorum Università di Bologna e Université de Montréal ( mobilità docenti). Finanziamento Chair Bell Canada 40.000 CAN$
Sous la direction de :
André H. Caron, Département de communication
Letizia Caronia, Département des sciences de l'éducation, Université de Bologne, Italie
Descriptif
Depuis quelques années maintenant, nous avons réalisé des études s’intéressant particulièrement à la construction
subjective du sens que les gens accordent aux technologies et à leurs usages. Une nouvelle étude a été menée à l’été 2004 auprès d’adolescents âgés de 15 à 18 ans afin d’explorer comment ils perçoivent la présence des nouvelles technologies dans leur quotidien. À travers l’analyse du discours sur le cellulaire et ses usages parmi les jeunes, nous avons reconstruit non seulement les
représentations du cellulaire et de ses usages, mais aussi
le rôle du discours sur les TIC dans la construction de
certains aspects de la culture spécifique des jeunes.
Objectifs
- Connaître plus à fond le fonctionnement de la culture technologique propre aux jeunes par des approches multiples dont des études ethnographiques.
- Découvrir comment le jeune construit son usage de la technologie et comment cette même technologie interagit avec le développement cognitif, affectif et psychosocial de l’enfant
- Comprendre comment se forment les dynamiques permettant aux jeunes de s’affranchir d’obstacles économiques, réglementaires, juridiques, etc.
Certaines dimensions majeures sur lesquelles portent nos
analyses ont traité de :
- L’analyse des registres linguistiques en tant qu’afficheurs des identités des interlocuteurs
- L’analyse des ouvertures et des clôtures des conversations comme marqueurs de la relation
entre les interlocuteurs
- L’analyse du langage et des choix d’écriture dans les SMS pour saisir la construction des
codes et d’une « langue technologique » comme trait de la culture spécifique des jeunes
Méthologie:
Ethnograhie
Focus groups
Analysies quantitatives des patterns linguistiques recurrent dans le corpus
Partenaires de recherche
- Projet SEUR (Sensibilisation aux études universitaires et à la recherche) de l’Université de
Montréal
- Laboratoires universitaires Bell
- Université de Bologne, Département des sciences de l’éducation
Resultats: presentés lors de plusieures conférences et publié dans nombreux articles scientifiques. Ils ont aussi donné lieux aux publications suivantes: A.H. Caron, L. Caronia, Culture mobile. PUM, 2005 et A.H. Caron, L. Caronia, Moving cultures: Mobile communication in everyday life, MCGill_Queens 2007
Per maggiori dettagli, consultare il sito http://www.cite.umontreal.ca, bottone Projets de recherche /research projects nonché l'allegato Rapporto annuale di ricerca del centro alle pagine: 7 (membership, Visiting researcher); P. 11 (partnership e collaborazione con l'Alma mater). pp. 19-21 ( descrizione del progetto
Ch. Caron (illustrateur non-identifié actif 1930) : [1930 ?]
No full textCh. Caron (illustrateur non-identifié actif 1930), couverture de “Sur le banc... près de la vieille église” [paroles Julsam & R. de Soutter / musique Alcib Mario / éd. Codini-Galifer & Julsam, s.d. , 1930 ? (titre inconnu du catalogue BNF)] ; première attestation (?), illustrateur inconnu des dictionnaires et sites spécialisés, inconnu de la BNF
Caron Taurima and Carich: Entrepreneurial success?
No full textCaron Taurima was founder and chief executive of Carich Training Centre Limited, a computer and English language training provider based in New Zealand. Named Ernst & Young New Zealand Entrepreneur of the Year in October 2003, Taurima became the much-maligned owner of a collapsed company just three weeks later. What happened? And what can be learnt from a situation like this? How do you define entrepreneurial success? And what processes might you follow if you are ever involved in organising or judging these kinds of business awards
Diglotta brasiliensis Caron & Ribeiro-Costa 2008
No full textDiglotta brasiliensis Caron & Ribeiro-Costa, 2008 Holotype “ Brasil - Paraná / Guaraqueçaba / Pasto / - 25,4153; - 48,4221 /0 m / 22 /VIII/ 2005 / C. A. Melo col.” “ 3 ”, printed on white label. “ HOLOTYPE / Diglotta brasiliensis / Caron & Ribeiro-Costa, 2008 ”, printed on red label. “ DZUP / 131046 ”, printed on white label. Paratypes (2) “ Brasil - Paraná / Guaraqueçaba / Pasto / - 25,4153; - 48,4221 /0 m / 22 /VIII/ 2005 / C. A. Melo col.”, printed on white label. “ PARATYPE / Diglotta brasiliensis / Caron & Ribeiro-Costa, 2008 ”, printed on yellow label. “ 3 ” “ DZUP / 131047 ” “Ƥ” “ DZUP / 131048 ”, printed on white label. Remarks: specimens preserved in glycerin. Paratypes (2) “ Brasil - Paraná / Guaraqueçaba / Cruz / - 25,4279; - 48,4189 /0 m / 22 /VIII/ 2005 / D. Lepka col.” “Ƥ”, printed on white label. “ PARATYPE / Diglotta brasiliensis / Caron & Ribeiro-Costa, 2008 ”, printed on yellow label. “ DZUP / 131049, 131050 ”, printed on white label. Paratypes (2) “ Brasil - Paraná / Guaraqueçaba / Cruz / - 25,4279; - 48,4189 /0 m / 29 /III/ 2005 / C. A. Melo col.”, printed on white label. “ PARATYPE / Diglotta brasiliensis / Caron & Ribeiro-Costa, 2008 ”, printed on yellow label. “ 3 ” “ DZUP / 131051 ” “Ƥ” “ DZUP / 131052 ”, printed on white label.Published as part of Ribeiro-Costa, Cibele S., Almeida, Lúcia M., Caron, Edilson, Corrêa, Geovan H., Linzmeier, Adelita M. & Dos, Paula B., 2010, Catalog of the types of some families of Coleoptera (Insecta) deposited at Coleção de Entomologia Pe. J. S. Moure, Curitiba, Brazil, pp. 1-34 in Zootaxa 2535 on page 8, DOI: 10.5281/zenodo.19660
Le Panoscope. Connaître la place occupée par une technologie immersive dans la conception artistique et muséologique
No full textRicerca internazionale finanziata ( 60.000 CAN$). Finanziamento: SAT (Société des Arts Technologiques), Montréal, Canada, Centre des sciences de Montréal, Fond Canadien pour l'innovation.
Projet de recherche in progess sous la direction de André H. Caron, (Université de Montréal) et directeur du Cité, et Letizia Caronia, professeure, science de l’éducation,Université de Bologne, Italie.
Introduction.
Le Panoscope 360 est installé depuis octobre 2007 dans l’une des salles du CSM (Centre des Sciences de Montréal) dans le cadre d’une exposition permanente de plusieurs années. Cette exposition présentera aux visiteurs (public ciblé: classes scolaires et jeunes visiteurs accompagnés par les parents) l’avancement actuel de diverses technologies afin qu’ils s’imaginent leur futur.
Objectifs:
Le mandat de recherche consiste en la réalisation,dans les premières années, de deux series d' évaluations pour saisir la transformation des formes traditionnelles d’interactions entre les jeunes usagers et la technologie immersive du Panoscope 360.
La première évaluation, plus formative, analysera les
mécanismes d’appropriation de cette technologie immersive
par un jeune public. La seconde évaluation, plus sommative,
analysera comment les règles conventionnelles d’interaction
avec une technologie non traditionnelle sont modifiées dans
l’appropriation et l’utilisation du Panoscope 360 °.
Etats des travaux:
Une revue littéraire sur les différents procédés immersifs utilisés en milieu muséal et sur le modéle pédagogique implicite à ce genre de conceptions museologiques, a également été rédigée en portant une attention particulière au caractère interactif des expositions muséologiques.
À la fin août, nous avons évalué une première projection BETA du contenu qui eut lieu à la SAT en compagnie de son principal créateur, Luc Courchesne et la société Space et Dream. Suite a cette évaluation les concepteurs ont apporté des changements pour que le contenu soit mieux adapté aux caracteristiques cognitives et sociales du public ciblé.
Methodologie;
Observations in situ des visiteurs (classes scolaires et public)
Audiovideo enregistrement du comportement naturel des visiteurs
Entrevues individuels aux visiteurs
Focus groups groupes scolaires
En automne 2007: soumission du projet au comité d'ethique, test des instruments de collecte de donnés (videocamera, microphones, grilles d'entrevue).
Cette recherche est rendue possible par le financement de la Fondation Canadienne pour l’Innovation ainsi que de la SAT et du CSM.
Per ulteriori dettagli consultare il seguenti siti
Société des arts et des sciences: www.sat.qc.ca
Centre des sciences de Montréal: www.centredessciencesdemontreal.com
Panoscope 360: www.panoscope360.com
Centre de recherche sur les technologies émergentes de l'université de Montréal (CITE): www.cite.umontreal.ca
Il progetto é presentato nel Bollettino del Centro di ricerca (in allegato) alla pagina 2
Ch. Caron (illustrateur non-identifié actif 1930) : [1930 ?]
No full textCh. Caron (illustrateur non-identifié actif 1930), couverture de “Sur le banc... près de la vieille église” [paroles Julsam & R. de Soutter / musique Alcib Mario / éd. Codini-Galifer & Julsam, s.d. , 1930 ? (titre inconnu du catalogue BNF)] ; première attestation (?), illustrateur inconnu des dictionnaires et sites spécialisés, inconnu de la BNF
Hypotelus brevitarsus Bortoluzzi & Caron, sp. nov.
No full textHypotelus brevitarsus Bortoluzzi & Caron sp. nov. (Figs. 15, 39, 58, 69, 70, 80, 98, 99, 114) Type material. Holotype deposited in FMNH, male (photo, Fig. 15), with labels: (1) “ PANAMA: Chiriqui Prov. “ Barca ” area, Finca / Lerida nr. Boquete./III:12:1959 5650 ft.” [white label, printed in black; day and elevation handwritten]; (2) “under slab on/pile of cut chips/and bark” [white label, printed in black]; (3) “leg./ H. S. Dybas ” [white label, printed in black]; (4) “ HOLOTYPE / Hypotelus brevitarsus / Bortoluzzi & Caron ” [red label, printed in black]. Paratypes: 11 specimens, deposited in FMNH. 1 male, dissected, whole specimen fixed on acetate plastic card covered with Canada balsam, with the same three first labels of holotype: (4) “ PARATYPE / Hypotelus brevitarsus / Bortoluzzi & Caron ” [yellow label, printed in black]. 1female, dissected, terminalia fixed on acetate plastic card covered with Canada balsam, with same three first labels of holotype: (4) “ PARATYPE / Hypotelus brevitarsus / Bortoluzzi & Caron ” [yellow label, printed in black]. 1 female, dissected, terminalia fixed on acetate plastic card covered with Canada balsam, with same three first labels of holotype, except for the date: “III:14:1959.”: (4) “ PARATYPE / Hypotelus brevitarsus / Bortoluzzi & Caron ” [yellow label, printed in black]. 7 specimens, sex undetermined, with same three first labels of holotype: (4) “PARATYPE/ Hypotelus brevitarsus /Bortoluzzi & Caron” [yellow label, printed in black]; one specimen of them with additional label: (4) “ Hypotelus /det. Newton 1994” [white label, first line, handwritten; second line, printed in black]; (5) “PARATYPE/ Hypotelus brevitarsus / Bortoluzzi & Caron” [yellow label, printed in black]. 1 specimen, sex undetermined, with same three first labels of holotype, except for the date: “III:14:1959.”: (4) “PARATYPE/ Hypotelus brevitarsus /Bortoluzzi & Caron” [yellow label, printed in black]. Additional material. See Appendix 2. Diagnosis. Hypotelus brevitarsus sp. nov. is similar to H. pusillus and differs by the antennal scape of male without prominent tooth on inner face; the antennae shorter, not reaching half-length of elytra; and tergite 10 with lateral sides at posterior margin emarginated in both sexes (Figs. 58, 98), besides the genital structures (see below). H. brevitarsus sp. nov. may be distinguished from other species of Hypotelus by the metatarsomeres 5 somewhat shorter and transverse (Fig. 39), although in some specimens this is not so prominent. Description. BL: 2.2–2.9 mm, BW: 0.6–0.8 mm. Body slightly convex; dorsal surface glossy; brown (elytra yellow); appendages lighter, except mandibles. Dorsal integument of head and pronotum with dispersed fine punctures and undulate microstriae only on margins; elytra with dispersed fine punctures and only one longitudinal finely punctate stria close to elytral suture. Male. Head. Supra-antennal area slightly prominent. Antennae reaching humeral angle; antennomeres 5, 7, 9 and 11 with longest setae on inner face; antennomeres 2 and 3 of equal length, 5–11 gradually increasing in length toward antennal apex. Mandibles symmetrical. Mentum 1.6 times as wide as long. Thorax. Pronotum wider than long (PW/PL=1.3); anterior angles rounded and slightly prominent; apical half with somewhat parallel sides and basal half gradually narrowing toward the base; with complete internal midlongitudinal ridge and slight longitudinal median sulcus only on basal half. Elytra somewhat longer than wide (EL/ BW=1.1), covering partially or not abdominal tergite 3. Metatarsomeres 5 somewhat shorter and transverse (Fig. 39). Abdomen. Tergite 8 with posterior margin rounded; sternite 8 with posterior margin rounded; tergite 9 with short ventral struts; sternite 9 with posterior margin truncate and with two pairs of long setae; tergite 10 with posterior and lateral margins weakly pigmented, with short fringes and four setae on each side (Fig. 58). Median lobe of aedeagus with bulbous base in ventral view and curved shape in lateral view (Figs. 69–70). Female. Similar to male except for: without very long setae on antennomeres 5, 7, 9 and 11; abdominal sternite 8 with posterior margin somewhat truncate and posterio-laterally slightly emarginated, with short setae (Fig. 80); tergite 9 without ventral struts; bursa copulatrix as H. pusillus; ovipositor consisting of a pair of weakly pigmented hemisternites and a pair of more apical coxites, and with many long setae on apex; spermatheca as Fig. 99. Geographical records. Panama (Chiriqui) (Fig. 114). Biological notes. This species was collected at elevations between 4750 ft (1447 m) and 6900 ft (2013 m), under a slab on a pile of cut chips and bark, in a split sapling, in scraping, in torn fibers of a wounded tree and under bark of a log on the ground. Remarks. Some specimens may have the metatarsomeres a little less transverse. The longest setae on inner face of antennomeres 5, 7, 9 and 11 are sometimes not so visible. In the material examined, there are five specimens collected from 4750ft (1447 m), which do not have the metatarsomeres 5 shorter and transverse, and we are unable to segregate these 5 specimens into more than one species. The feature metatarsomere 5 shorter and transverse is only visible on the specimens collected above 5000ft (1524 m). Etymology. The specific name refers to the shape of the metatarsus and is a compound name: Latin adjective brev - (short), the connective vowel i, and the Greek noun latinized to tarsus (foot). It is a noun in apposition.Published as part of Bortoluzzi, Sidnei, Caron, Edilson & Ribeiro-Costa, Cibele S., 2017, Revision and phylogeny of Hypotelus Erichson: a Neotropical genus of minute rove beetles (Coleoptera, Staphylinidae, Piestinae), pp. 451-487 in Zootaxa 4273 (4) on pages 462-463, DOI: 10.11646/zootaxa.4273.4.1, http://zenodo.org/record/80364
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