Search results for "Amari"
showing 10 items of 162 documents
Luminescence and vacuum ultraviolet excitation spectroscopy of samarium doped SrB4O7
2020
Abstract Sm2+ and Sm3+ co-doped SrB4O7 could be utilized in several high-level optical devices and fundamental knowledge about the optical behavior of these materials benefits the development of luminescent applications. Herein, we report luminescence and its vacuum ultraviolet (VUV) excitation spectra in samarium doped SrB4O7. Both, Sm2+ and Sm3+ luminescence centers have been examined and distinguished in the emission and the excitation spectra investigated under synchrotron radiation. The contribution of either Sm2+ or Sm3+ emission lines into the emission spectra heavily depended on the excitation energy, and strong f-f transitions of both Sm2+ and Sm3+ were detected. At 10 K, a broad i…
Análisis de la LOMLOE (Ley Orgánica 3/2020, de 29 de diciembre, por la que se modifica la Ley Orgánica 2/2006, de 3 de mayo, de educación) y su reper…
2021
La Ley Orgánica 2/2006, de 3 de mayo, de Educación (LOE), se modifica por la Ley Orgánica 8/2013, de 9 de diciembre, para la mejora de la calidad educativa (LOMCE), y se deroga esta última por la llamada LOMLOE (Ley Orgánica 3/2020, de 29 de diciembre, por la que se modifica la Ley Orgánica 2/2006, de 3 de mayo, de Educación), que se publica el 30 de diciembre de 2020 en el Boletín Oficial del Estado. La institución educativa formal ha de introducir medidas educativas vinculadas con el entorno y con profesionales de la educación de organizaciones del contexto; en el texto modificado de la LOE (LOMLOE) se recogen los principios y fines educativos que son necesarios educar en la actualidad y …
«La Croce di Savoia» e il liberalismo siciliano nel regno di Sardegna. 1850-51”
2007
L'articolo "La Croce di Savoia" e il liberalismo siciliano nel Regno di Sardegna: 1850-1851 ricostruisce l'esperienza editoriale del quotidiano che Francesco Ferrara fondò insieme a Emerico Amari e Vito D'Ondes Reggio nei primi anni del loro esilio dopo il fallimento della Rivoluzione del '48. Il giornale, che fu la voce dei liberali palermitani, intervenne vivacemente in tutti i principali dibattiti del Piemonte all'inizio della sua vita statutaria e divenne, anche se per breve tempo, protagonista nello scenario politico subalpino. La redazione si contraddistinse per la fiducia nel libero mercato, il sostegno alla realizzazione di un sistema politico rappresentativo, la richiesta di un amp…
New synthetic strategies for the enhancement of the ionic conductivity in Ce0.8Sm0.2O2-x
2013
Introduction Samarium-doped ceria has been widely investigat-ed for electrochemistry applications as full density elec-trolyte for intermediate temperature solid oxide fuel cells (IT-SOFC), between 500°C and 800°C [1]. One of the main challenges for the ceria-based electrolytes is to decrease the resistivity at the grain boundary zone, especially in this low temperature range. Microstructure and morphology of the powder play a fundamental role on the densification behaviour and grain boundary properties, thus affecting the overall conductivity of electrolytes [2]. In this light, solution combustion syn-thesis (SCS) represents a flexible method to produce ultra fine powders with suitable mic…
Paesaggi urbani e rurali nella Sicilia di Tommaso Fazello: note di geomorfologia e archeologia
2014
The studies of Sicilian ancient landscapes, the histories of sites, towns and marks of antiquity, have necessarily to trace back to Tommaso Fazello’s book. Before him, nobody else had offered such a detailed depiction of ancient Sicily, and the methodology of his research is still very authentic. In addition to describing the ruins of ancient cities and identifying them (Selinunte is for instance a very special case), one could affirm that Fazello’s interest was also in the natural characterization and transformation of both rural and urban landscapes. In brief, it is possible to define the figure of Fazello in terms of a geoarchaeologist ante litteram. The descriptions of some towns – the …
Thermal and spectroscopic investigation of europium and samarium sulphates hydrates by TG-FTIR and ICP-MS techniques.
2005
The investigation of europium(III) sulphate hydrate and samarium(III) sulphate hydrate was performed by thermal analysis (TG-DTG) and simultaneous infrared evolved gas analysis-Fourier transformed infrared (EGA-FTIR) spectroscopy. The TG, DTG and DTA curves were recorded at the 25-1400 degrees C in the dynamic air atmosphere by TG/DTA analyser. The infrared evolved gas analysis was obtained on the FTIR spectrometer. Eu(2)(SO(4))(3).nH(2)O (n=3.97) and Sm(2)(SO(4))(3).nH(2)O (n=8.11) were analysed, the dehydration and decomposition steps were investigated and the water content was calculated. The formation of different oxysulphates was studied. The trace rare earth elements in Eu and Sm sulp…
The gas-phase chemiionization reaction between samarium and oxygen atoms: A theoretical study
2004
The Sm + O chemiionization reaction has been investigated theoretically using a method that allows for correlation and relativistic effects. Potential energy curves have been calculated for several electronic states of SmO and SmO+. Comparison with available spectroscopic and thermodynamic values for these species is reported and a mechanism for the chemiionization reaction Sm + O is proposed. The importance of spin–orbit coupling in the excited states of SmO, in allowing this chemiionization reaction to take place, has been revealed by these calculations. This paper shows the metal-plus-oxidant chemiionization reaction.
Leaf anatomy in Tamarix arborea var. arborea (Tamaricaceae)
2012
Previously unpublished data on the macro- and micro-morphological features of the leaf of Tamarix arborea var. arborea are provided. Clear differences in salt gland localization and type of venations were observed in the investigated species compared to other Tamarix species, thus emphasizing the taxonomic value of the leaf within this genus.
Nuovi ospiti di Inonotus tamaricis (Hymenochaetaceae) in Sicilia
2010
L’autore segnala T. arborea var. arborea, T. africana var. fluminensis e T. rosea quali nuovi ospiti di Inonotus tamaricis, agente di carie bianca. Si tratta di tamerici coltivate e spontanee, ampiamente diffuse nel territorio, che vegetano in condizioni precarie e di stress principalmente a causa di interventi di potatura poco razionali e del forte inquinamento.
Tamarix, from archaeological to contemporary landscape
2018
One of the most well-known references to the presence of Tamarix species in ancient times is reported in Genesis (21:33). At that time, the tamarisks were used as decorative elements in oaths, purification, and divination. The tamarisk leaves were also used in concoctions and to ward away evil influence, and the branches to construct magic circles. The landscape surrounding the Abraham well in Beersheba is still characterized by the presence of Tamarix nilotica (Ehrenb.) Bunge. This species is particularly widespread along the banks of the sacred Jordan and Jabbok Rivers. In some old and recent paintings we can recognize habitus, habitat and, morphological features of tamarisk species such …