Search results for "IMPR"
showing 10 items of 1334 documents
Interaction of Ni/SiO2 with thiophene.
2009
Abstract The interaction between Ni/SiO 2 (18 wt%) and thiophene was studied by thermal gravimetric analysis (TGA) and in a fixed-bed reactor. The samples were prepared by incipient wetness impregnation and reaction was realized in hydrogen flow at 280–360 °C in the presence of 10–40 mbar of thiophene. It is found that sulfidation of Ni is not complete in TGA experiments and the maximum achievable transformation degree depends not only on the temperature and thiophene pressure, but also on the sample weight and the gas flow rate. The maximum transformation degree is shown to vary reversibly when conditions are changed. Analysis of the reaction products during sulfidation in a fixed-bed reac…
Reaction of thiophene with mono- and bimetallic Ni–Co particles supported on γ-Al2O3 and HDS activities of obtained sulfides
2009
Abstract Reaction between thiophene and M/γ-Al2O3 (20 wt.%, M = Ni, Co, 2Ni–Co and 2Co–Ni) was studied by thermal gravimetric analysis (TGA) and by sulfidation in a fixed bed microreactor. The samples were prepared by incipient wetness impregnation followed by drying and reduction in hydrogen flow at 450 °C. Formation of bimetallic particles in samples containing both Ni and Co was confirmed by HRTEM with EDX analysis. The reaction with thiophene (20 or 40 mbar) was done at 360 °C in hydrogen atmosphere. TGA of the reaction with thiophene revealed that the initial rate of sulfidation drops sharply when going from Ni/γ-Al2O3 to Co/γ-Al2O3 (by a factor of 40 under used conditions). It follows…
The thermophysical characterization of technical elements in the historic architecture: experiences in Palermo
2014
Per contemperare il miglioramento delle prestazioni energetiche e ambientali dell'architettura storica con l'esigenza della sua conservazione, è necessario analizzare le caratteristiche termofisiche dei materiali e degli elementi tecnici che la connotano. Tuttavia la disponibilità di pochi dati in merito si somma alle disomogeneità tipiche della costruzione storica e alle difficoltà di analisi ad esse connesse. In particolare, per la trasmittanza termica delle murature storiche, la letteratura scientifica evidenzia scostamenti anche notevoli tra i valori desunti da misure in situ e quelli calcolati, in genere superiori ai primi. Il contributo espone gli obiettivi e la metodologia di un prog…
Introduction to coronary imaging with 64-slice computed tomography
2005
The aim of this article is to illustrate the main technical improvements in the last generation of 64-row CT scanners and the possible applications in coronary angiography. In particular, we describe the new physical components (X-ray tube-detectors system) and the general scan and reconstruction parameters. We then define the scan protocols for coronary angiography with the new generation of 64-row CT scanners to enable radiologists to perform a CT study on the basis of the diagnostic possibilities.
Diego de Gumiel, impresor de Tirante el Blanco en 1511, y la presencia de las islas Canarias en la traducción de la novela
2011
El artículo repasa la trayectoria de Diego de Gumiel, impresor en Barcelona hasta 1501, fecha en que se traslada a Valladolid. Allí imprimirá, en 1511, la traducción castellana de Tirante el Blanco. Pese a la relevancia que le concede Miguel de Cervantes a esa traducción, solamente se conservan dos ejemplares y muy pocas noticias. Se estudian las diferencias entre las portadas de ambos ejemplares. Se destaca la presencia en la novela del gran rey de Canaria como conquistador de Inglaterra, motivo seudo-histórico procedente de la Historia Regum Britanniae de Geoffrey de Monmouth.
Locally compact (2, 2)-transformation groups
2010
We determine all locally compact imprimitive transformation groups acting sharply 2-transitively on a non-totally disconnected quotient space of blocks inducing on any block a sharply 2-transitive group and satisfying the following condition: if Δ1, Δ2 are two distinct blocks and Pi, Qi ∈ Δi (i = 1, 2), then there is just one element in the inertia subgroup which maps Pi onto Qi. These groups are natural generalizations of the group of affine mappings of the line over the algebra of dual numbers over the field of real or complex numbers or over the skew-field of quaternions. For imprimitive locally compact groups, our results correspond to the classical results of Kalscheuer for primitive l…
Il contributo delle culture locali
2010
Il contributo espone le politiche culturali che negli anni hanno caratterizzato la progettualità del Dipartimento di Design di Palermo che ha trovato una strada da percorrere nel territorio siciliano incentrando le azioni progettuali sul radicamento nelle risorse umane e materiali del territorio. Tale orientamento ha consentito, con largo anticipo sui tempi, di privilegiare le aziende la cui eccellenza poggiasse su requisiti che non fossero mirate solo al mercato, ma che eticamente si rivolgessero ad un miglioramento generale delle condizioni della qualità della vita, derivanti da una forte valorizzazione del capitale umano, delle condizione della qualità del lavoro produttivo, e dal progre…
Probabilistic semantics for categorical syllogisms of Figure II
2018
A coherence-based probability semantics for categorical syllogisms of Figure I, which have transitive structures, has been proposed recently (Gilio, Pfeifer, & Sanfilippo [15]). We extend this work by studying Figure II under coherence. Camestres is an example of a Figure II syllogism: from Every P is M and No S is M infer No S is P. We interpret these sentences by suitable conditional probability assessments. Since the probabilistic inference of \(\bar{P}|S\) from the premise set \(\{M|P,\bar{M}|S\}\) is not informative, we add \(p(S|(S \vee P))>0\) as a probabilistic constraint (i.e., an “existential import assumption”) to obtain probabilistic informativeness. We show how to propagate the…
Relazione di sintesi.
2015
Si tratta della Relazione di sintesi nel Convegno su «La tela di Penelope e i rapporti tra “penale” e “tributario”: una orditura possibile?», organizzato dal Centro Siciliano di Studi sulla Giustizia, dall’Università LUMSA e dall’AIGA, tenutosi a Palermo il 21 aprile 2016, nella Aula Magna Facoltà di Giurisprudenza Università LUMSA.