87,267 research outputs found
Spazio Nudo: Carlo Scarpa interpreta Alberto Viani
No full textIl contributo analizza il ruolo della scultura di Viani "Nudo al Sole" all'interno del negozio Olivetti di Scarpa
"Nude Space": Carlo Scarpa interprets Alberto Viani
No full textThe thesis considers the role of the sculpture of Alberto Viani "Nuodo al Sole" (Nude in the Sun) in the design of Olivetti Shop by Carlo Scarpa
Synhtesis of enantiomerically pure 1',2'-seco-nucleosides and 1',2'-seco-2'-nor-nucleosides carrying fluorine and sulfur substituents
No full textEleven title nucleosides (6a-f, 8a-c, 11a,b) having the same chirality of natural products at the carbon mimiking C-4' and carrying a purine or pyrimidine base have been synthesized
Da Reni a Turchi, da Romanelli a Viani: "difficoltà" del Seicento
No full textAttraverso i casi di due quadri conservati nel Museo dell'Ermitage di San Pietroburgo si esemplifica quella che già Roberto Longhi chiamava la 'difficoltà' del Seicento, laddove, in assenza di notizie precise circa la provenienza dei dipinti, il lavoro del 'conoscitore' si fa particolarmente complesso. Attraverso numerose opere inedite viene restituita la fisionomia del pittore bolognese Giovanni Maria Viani
THE EFFECT OF SUPERSATURATION ON THE PARABOLIC RATE CONSTANT FOR INTERNAL OXIDATION WITH PRODUCTION OF A PURE OXIDE: AN APPROXIMATE ANALYTICAL TREATMENT
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Use of organic additives as binders in raw mixtures for ceramic tiles
No full textThe aim of this work is the study of the role played by organic additives used as binders in raw mixtures for ceramic tiles. Such binders are extensively used for the production of advanced ceramic materials. In traditional ceramics, they can, in principle, allow for a drastic education of the clay fraction and consequently a very positive effect on the colour of the ceramic body without affecting its peculiar physical properties. Polyvinyl alcohol (PVA) was added in proportions of less than 0.5 wt% to different typical raw ceramic mixtures in which the weight fraction of clay minerals was reduced of about 50 wt%. In each case, it was possible to obtain very good mechanical properties of the green bodies. Clay minerals are the component of the mixture with the highest price and the highest content of iron and titanium (known to have negative effects on the whiteness of the ceramic body). Decreasing the amount of clay minerals makes possible to produce ceramic bodies with the same colour, using less quality (i.e. less expensive) raw materials. This can also lead to reconsider the use of several raw materials present on the national territory. Furthermore, superwhite ceramic bodies can easily be obtained even without the introduction of very expensive components such as zircon and alumina. Possible drawbacks appear to be not severe as the milling times are increased of less than 3% (in laboratory), and additional costs due to the organic additive are overwhelmed by the savings due to the choice of less expensive raw materials and the reduction of the clay fraction (up to 20%)
Traded and nontraded goods prices, and international risk sharing: an empirical investigation
No full textSynthesis of fluorinated analogues of acyclic nucleosides as potential antiviral agents
No full textIn the search for more effective antiviralagentsnucleosides and nucleosideanalogues have been explored extensively.
We report the synthesis of a number of acyclicanalogues of guanosine, adenosine, and uridine fluorinated at different sites of the acyclic moiety.
All compounds have been obtained in optically pure form by condensing chloromethyl 1,3-disubstituted-2-propyl ethers, chloromethyl 1,3-disubstituted-2-butyl ethers, and 1-chloroethyl 1,3-disubstituted-2-propyl ethers with the desired bases.
Open chain fluoroalcohols, needed as starting materials, have been made available by elaborating homochiral fluorinated β-ketosulphoxides.
Difluorinated molecules were obtained by DAST treatment of sulphoxide intermediates.
In the nucleosideanalogues one or two fluorine atoms are present at the positions corresponding to the 3′ and 5′ carbon atoms of the sugar molecule
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