Search results for "raft"
showing 10 items of 1545 documents
ChemInform Abstract: Enantioselective Zirconium-Catalyzed Friedel-Crafts Alkylation of Pyrrole with Trifluoromethyl Ketones.
2009
The first catalytic enantioselective Friedel−Crafts alkylation of pyrrole with 2,2,2-trifluoroacetophenones to give pyrroles with a trifluoromethyl-substituted tertiary alcohol moiety bearing a quaternary stereogenic center is described. The reaction is achieved in the presence of a 3,3′-dibromo-BINOL-Zr(IV) complex to give the expected products with high yields (up to 98%) and good enantioselectivities (up to 93% ee). The absolute stereochemistry of the products has been determined by chemical correlation.
Dimethoxy Aromatic Compounds. VIII. Degenerate Dealkylation-Realkylation Reaction of 1-Bis(2,4-dimethoxyphenyl)-2-methylpropane.
1994
The condensation reaction under acid condition of the benzylic alcohols 1, 2 and 3 with the hexadeutero dimethoxybenzenes 4, 5 and 6 leads to the expected hexadeutero bis(dimethoxyphenyl)-2-methylpropanes 7, 8 and 9, respectively. However, the presence of both dodecadeutero and unlabelled 1-bis(2, 4-dimethoxyphenyl)-2-methylpropanes 10 and 11 indicates that 9 undergoes a rapid degenerate dealkylation-alkylation reaction.
Aneurismas complejos de la aorta abdominal: cirugía abierta frente a exclusión endovascular avanzada. Estudio comparativo.
2015
Justificación del estudio e hipótesis de trabajo: la enfermedad aneurismática de la aorta se estima que afecta al 2%-7% de los varones mayores de 60 años. Dichas estimaciones, extrapoladas a la población de España, se corresponderían con 140.000-350.000 personas portadoras de una aneurisma de aorta abdominal. En siete de cada cien personas acaece la rotura del aneurisma, siendo actualmente la décima causa de muerte en varones mayores de 55 años. En aquellos pacientes de alto riesgo para la cirugía abierta en los que la exclusión endovascular con endoprótesis de sellado infrarrenal está contraindicada por mala calidad del cuello aneurismático, la exclusión endovascular avanzada con endopróte…
Construction Guilds in Southern Italy and the Islands (15th-16th Centuries): Leadership and Rivalries
2020
In the South of Italy and the big islands, in counter-trend with respect to the rest of the peninsula, construction guilds know a renewed vitality between the last decades of 15th and the beginning of 16th centuries. Rules, prerogatives and operative modes are regulated by statutes, often undersigned by the masters included in the trade organization, mentioning also the other actors involved in the approval processes. The intertwining of these and other archival documents sometimes reveals the leading role played within the guild by masters that overcome the anonymity usually considered to be inherent in the corporate system. Comparing the rules and the boundaries among specific trades esta…
Innovative Recycling of Lime Slaker Grits from Paper-Pulp Industry Reused as Aggregate in Ambient Cured Biomass Fly Ash-Based Geopolymers for Sustain…
2019
Lime slaker grits and biomass fly ash are solid wastes produced by the Kraft paper-pulp industry that are commonly disposed of in landfill. However, recent studies and European regulations discourage such disposal practices. This work investigates an alternative and innovative way to recycle and reuse these wastes in the production of green geopolymeric mortars intended for application in the construction industry. Here, biomass fly ash was used as the main source of alumino-silicate in the binder precursor (70 wt.% substitution to metakaolin), and grits (ranging from 1&ndash
Digitale kommunikasjonsløsninger for samhandling mellom koronar bypassopererte pasienter og helsepersonell på spesialistsykehus etter utskrivelse til…
2016
Masteroppgave i helse- og sosialinformatikk- Universitetet i Agder, 2016 Background In Norway there are expectations of further development and strategic investment in information technology within the health care system. Persons who undergo a coronary artery bypass graft (CABG) surgery are in need of information and guidance related to problems that may arise after they have returned home from hospital. Purpose The purpose of this project was to explore to what extent digital communication solutions might meet the need for information and guidance from health personnel experienced by patients who had undergone a CABG surgery, after discharge from the specialist hospital. Additionally, it w…
Playful Hands-on Crafting for Personal Growth and Communal Well-being
2017
Crafts education in Finland has recently been exposed to considerable challenges, on both the theoretical and practical levels. The emphasis is shifting to personal expression and communal arts and crafts practices are being adapted to solidify social and cultural participation. Learning research shows us how inner motivation and multilevel objectives in comfortable learning environments induce stable and generalizable learning results. In addition, collaborative ways of working make data processing more open and turn learning into a shared effort. On the other hand, playful learning and dramatic methods offer productive ways of examining life situations in an active and empathetic way. Whe…
Production et commerce, quelques aspects dans le nord de la Gaule romaine (Ier-IIIe siècle de notre ère)
2023
L’étude de l’économie de la Gaule romaine par les archéologues a traditionnellement privilégié l’analyse des lieux de production agricole et artisanale, ainsi que la diffusion des produits manufacturés. La large diffusion de produits à l’échelle du bassin méditerranéen et jusque dans les provinces septentrionales de l’Empire, voire en dehors, suggère une économie ouverte aux échanges à longue distance. Les recherches montrent cependant que la diffusion n’atteint jamais la totalité de l’Empire, voire du Bassin méditerranéen, si ce n’est de manière marginale. Par ailleurs, à l’écart des rivages de la Méditerranée, l’examen des mobiliers provenant de sites d’habitat conduit à nuancer la place …
Functional interpretative approaches on shears at the end of the Iron Age and the beginning of the Roman Principate. The example of shears in the cem…
2011
Scheren werden häufig als multifunktionale Geräte aufgefasst, deren genauere Bestimmung schwer einzugrenzen ist. Jedoch geben deren Form und technische Eigenschaften über die vorgesehene Verwendung Aufschluss. Es ist also möglich, eine neue Gliederung dieser Objekte vorzunehmen, und zwar anhand der Funktion, die sie am besten zu erfüllen scheinen. Diese Einteilung der Scheren aus den Nekropolen der Treverer wird durch die jeweils begleitenden anderen Grabbeigaben verifiziert. Das Beispiel der Scheren aus den Gräbern der Treverer macht es zudem möglich, diese Stücke anhand der sonstigen Beigaben einerseits in die Technikgeschichte und andererseits in die Sozialgeschichte einzuordnen.
“Autographic wood-engraving: Modernist DIY“
2017
International audience; This paper focuses on the description of modernist wood engraving as a humble form of art in the manuals published by John Farleigh, Clare Leighton and Iain Macnab between 1932 and 1940. As a specific form of artistic encounter with a medium, autographic wood engraving relied on the heritage of the Arts and Crafts’ ethics of making as well as on the modernist aesthetics of carving. This paper aims to show that the efficacy of humbleness as an artistic stance allowed wood engraving to straddle the provinces of art, craft and design at a time when the function of artistic skill and handmaking was being displaced.