102,459 research outputs found
TUFFACEOUS DEPOSITS IN THE SEDIMENTARY COVER OF THE STRONA-CENERI ZONE AND IN THE VILLAFORTUNA-TRECATE OIL SYSTEM: PETROLOGICAL, GEOCHEMICAL AND GEOCHRONOLOGICAL CHARACTERIZATION
No full textIn the western sector of the Southern Alps, tuffaceous levels are occasionally found in Triassic sedimentary sequences and the age of the related magmatism is still matter of debate. The few available geochronological data on these tuffites (M. San Giorgio area, Lugano, CH) yield Triassic ages (245±1 Ma; U-Pb zircon [1]), which are slightly older than the stratigraphic position. The precise definition of the tuffite age is, however, important for the Triassic evolution of the western Alps. In particular, if the magmatism is synchronous with their stratigraphic position, tuffites might be linked to the Triassic magmatism documented by the Finero area (NE Ivrea-Verbano Zone [2]). However, it cannot be presently excluded that they are the product of erosion and re-deposition of the Permian acid volcanics located at the base of the Mesozoic sedimentary cover [3].In this work, we have considered the tuffaceous deposits occurring within a late Anisian-Ladinian succession in the Mesozoic sedimentary cover of the Strona-Ceneri Zone in the Borgosesia area [3,4] and the tuffites at the same stratigraphic position found in some wells of the Villafortuna-Trecate oil system field (western Po Plain, Piedmont region, NW Italy) [5]. These tuffaceous deposits are constituted by a variable mixture of magmatic and sedimentary components. Available chamical data on the magmatic component suggests a calc-alkaline affinity. Zircons have been separated with conventional methods from four samples, mounted in epoxy resin and characterised under cathodoluminescence (CL). Based on colour, morphology and internal structure, zircons have been divided in two populations. One group is constituted by light-pink coloured zircons with prismatic habits and tight osciscillatory zoning suggesting growth under magmatic conditions. Zircons from the second group are colourless, rounded in shape and with only relics of magmatic zoning. They most likely suffered metamorphic recrystallization.Ongoing ELA-ICP-MS characterizations of both trace elements composition and U-Pb age of these zircons is expected to provide valuable constraints on the geodynamic evolution of the Southern Alps Domain in Permo-Triassic times.References. [1] Mundil, R., Brack, P., Meier, M., Rieber, H., Oberli, F. (1996): Earth and Planetary Science Letters, 141, 137-151; [2] Peressini, G., Mazzucchelli, M., Rivalenti, G., Hofmann, A.W. (2004): Geophysical Research Abstracts, 6, 05072, SRef-ID: 1607-7962/gra/EGU04-A-05072; [3] Carraro, F., Fiora, L. (1974): Riv. It. Paleont. Strat., 80, 167-191; [4] Fantoni, R., Decarlis, A., Fantoni, E. (2004): Atti Tic. Sc. Terra, 44, 97-110; [5] Fantoni, R., Bello, M., Ronchi, P., Scotti, P. (2002): Extended Abstracts Book EAGE Conference Florence
A translation of the twelve principles of green chemistry to guide the development of cross-coupling reactions
No full textIn this paper, the applications, impact, and development of green cross-coupling reactions in academia and industry are discussed. Specifically, we discuss the translation of the Twelve Principles of Green Chemistry and their applications in pharmaceutical organometallic chemistry to stimulate the development of cost-effective and sustainable catalytic processes for the synthesis of active pharmaceutical ingredients (API). The evolution of the process for the synthesis of 3-ethylnyl aniline, a key intermediate for the synthesis of the tyrosine kinase inhibitor erlotinib, was described as an example of the application of this translation guide
Il monumento della Pace di Piazza Libertà di Udine: materiali, tecniche e risultati del restauro
No full textLetter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
Modale/amodale: l’occluso si restringe l’occludente si allarga
No full textScopo di questo lavoro è fornire uno studio sistematico degli effetti dimensionali propri di configurazioni percettive caratterizzate da superfici che retinicamente giacciono in giustapposizione ma che fenomenicamente vengono stratificate in figure intere e sovrapposte.
Ciò che si può osservare effettuando un confronto simultaneo fra un quadrilatero disegnato a tratto e lo stesso quadrilatero coperto parzialmente da una rettangolo nero, è che il quadrilatero che appartiene alla configurazione di occlusione apparirà avere una estensione orizzontale minore di quella del quadrilatero presentato in isolamento. Tale effetto di contrazione fenomenica delle superfici parzialmente occluse è stato per la prima volta esplicitato da Kanizsa nel 1975. L’autore spiega tale effetto con un'ipotesi di natura energetica, per cui la superficie parzialmente coperta verrebbe contratta nella sua dimensione orizzontale a causa del fatto che il sistema percettivo deve colmare il gap di informazione locale presente fra i due contorni condivisi per sopperire alla frammentazione dell’immagine retinica e consegnare a livello percettivo il vissuto di un percetto intero. Naturalmente tale ipotesi prevede che vi sia un effetto dimensionale solo sulla estensione orizzontale della superficie parzialmente coperta.
Tale predizione è stata sconfermata da Vezzani (1994) che riscontra, su stimoli simili a quelli usati da Kanizsa, un effetto dimensionale di contrazione sulla estensione verticale della superficie occludente.
L’esperimento che abbiamo condotto intende testare la bontà delle diverse ipotesi eseguendo una misurazione degli effetti dimensionali presenti nelle diverse estensioni (verticale-orizzontale) di configurazioni di occlusione del tipo di quelle usate da Kanizsa, sulle due parti che fenomenicamente costituiscono il percetto stratificato (occludente e occlusa).
I risultati indicano la presenza di almeno tre effetti dimensionali: effetto di contrazione fenomenica dell’estensione orizzontale dell’occluso; effetto di estensione fenomenica dell’estensione verticale dell’occluso; effetto di espansione fenomenica dell’estensione orizzontale dell’occludente.
I risultati di questa ricerca sembrano congruenti con una ipotesi che tenga in considerazione l’effetto della configurazione intesa come Gestalt percettiva sulla dimensione fenomenica delle parti che la determinano. Si suggerisce pertanto una nuova ipotesi basata sull’assunzione che gli effetti dimensionali dell’occlusione siano dovuti allo spreading-in/spreading-out di qualità superficiali attraverso i due contorni condivisi che caratterizzano la configurazione
Does the dimensionality of the perceived size play a role in the SNARC-like effect for visual illusions?
No full textThe Spatial-Numerical Association of Response Codes (SNARC) effect is considered evidence of the association between number magnitude and space, and consists of faster left key-press responses to small numbers and faster right key-press responses to large numbers. Recent studies found that this association extends to non-numerical magnitudes, such as to luminance and to the physical size of pictorial surfaces. Sarcetta, Prpic, Murgia, Galmonte & Agostini (2015) investigated whether this effect extends to phenomenal size of two-dimensional figures. Authors found a SNARC-like effect associated to the physical size of the inducers used in the Delboeuf size-contrast configuration (i.e., closed rings) and the Kaniza’s triangle (i.e., pacmans). No SNARC-like effect was instead observed for the phenomenal size of the two-dimensional figures (i.e., filled circle and illusory triangle). The present study further extends this line of research aiming at investigating if a SNARC-like effect occurs for the phenomenal size of one-dimensional (rather than two dimensional) figures. The Muller-Lyer and the Ponzo illusions were considered. For the “Muller-Lyer” experiment, participants were required to compare two equally long, but perceptually different lines presented simultaneously to the left and right side of the screen. In the first session participants had to press the left key when the (apparently) longer line appeared on the left side of the screen and the right key when it appeared on the right. In the second session participants had to detect the line that appeared shorter rather than longer. For the “Ponzo” experiment, participants were required to compare two equally long lines simultaneously presented to the left and right side of the screen, that were displayed within the Ponzo’s inducers. The procedure and the response assignments were the same as in the Muller-Lyer experiment. Results suggest that the phenomenal size experienced in both geometrical size illusions did not elicit a SNARC-like effect. Similarly, no evidence was found that the physical dimensions of the inducers elicit a SNARC-like effect in neither the Muller-Lyer nor the Ponzo configuration. This result, taken together with the result of Sarcetta et al. (2015), suggests that a SNARC-like effect can be elicited only by the physical size of pictorial surfaces and not by the phenomenal size of neither two-dimensional nor one-dimensional figures
Response to cidofovir after failure of antiretroviral therapy alone in AIDS-associated progressive multifocal leukoencephalopathy
No full textPredicting employee attrition and explaining its determinants
No full textAn increased focus on utilizing data analytics to tackle human resource (HR) issues and make more informed and data-driven decisions is spreading in firms and public institutions. One of the major challenges faced by orga-nizations is employee turnover, which can have negative impacts on productivity, performance, and overallcorporate reputation. In light of these considerations, this study endeavors to predict employee attrition bydeploying Machine Learning (ML) models on real-world data obtained from a prominent Italian financial cor-poration. Although the use of ML to predict attrition and investigate the main employers-employees features isdocumented in literature, what characterizes our study is the investigation of the crucial dimension of featuredirection. Nonetheless, recognizing this directional aspect is pivotal for HR managers entrusted with makinginformed decisions. In our research, we employ the SHAP (SHapley Additive exPlanation) algorithm to not onlyidentify feature contributions but also to assess their direction. Beyond mere algorithm implementation, ourstudy interprets the outcomes within the specific context of HR decision-making. This comprehensive approacheffectively highlights the inherent limitations of standalone algorithms, which may produce only partial results,capturing the importance of a feature, but missing its direction. Indeed, sometimes, while the feature is wellknown, its direction is somehow counterintuitive, thus requiring a deeper investigation and understanding. In a period like the present one, where the new production paradigms and the Covid-19 pandemic altered the consolidated labor market, new phenomena are emerging and only a profound understanding of the contextual novel dynamics can foster well-informed decision-making processes
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