1,721,003 research outputs found
Solid state equilibria in the system Al2O3-La2O3-Cr2O3: Reactivity catalyst/support LaCrO3/Al2O3
No full textThe zone of the ternary system Al2O3-La2O3-Cr2O3 delimited by LaCrO3, LaAlO3, Al2O3 and Cr2O3 has been examined. The existence of an extended field of mixed crystals with rhombohedral symmetry LaAl1-xCrxO3 (0≤x≤0·85) has been verified. On the other hand, for x>0·85, the solids show XR diffraction spectrograms typical of the orthorhombic phase LaCrO3. It has been found a small isomorphous substitution of Al3+ by Cr3+ in the β-alumina type phase, leading to the formation of the LaAl11-x CrxO18 series (0≤x≤0·75); moreover, the existence of Al2-xCrxO3 (0≤x≤2) mixed crystals field has been confirmed. Finally it has been experimentally verified that catalytic systems formed by mechanical mixtures of LaCrO3 and Al2O3 prepared anyhow (LaCrO3 dispersed or supported on Al2O3) result thermodynamically unstable whatever the composition
Point-contact tunneling in monophasic and polyphasic Y-Ba-Cu-O samples: experiment and model
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BrainArt: A BCI-based assessment of user's interests in a museum visit
No full textIn the near future our brain will be connected to many applications. Recently research has concentrated on using the Brain Computer Interface (BCI) passively to recognize particular users' mental states. In this paper, we explore the possibility to harness electroencephalograph (EEG) signals captured by off-The-shelf EEG low-cost headsets to understand if an exhibition piece is of interest for a visitor. This information can be used to enrich the user profile and consequently to suggest artworks to see during the visit according to a recommendation strategy. The results of the exploratory study show the feasibility of the proposed approach
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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