Search results for " Bari"
showing 10 items of 51 documents
High-pressure study of the behavior of mineral barite by x-ray diffraction
2011
In this paper, we report the angle-dispersive x-ray diffraction data of barite, BaSO 4, measured in a diamond-anvil cell up to a pressure of 48 GPa, using three different fluid pressure-transmitting media (methanol-ethanol mixture, silicone oil, and He). Our results show that BaSO 4 exhibits a phase transition at pressures that range from 15 to 27 GPa, depending on the pressure media used. This indicates that nonhydrostatic stresses have a crucial role in the high-pressure behavior of this compound. The new high-pressure (HP) phase has been solved and refined from powder data, having an orthorhombic P2 12 12 1 structure. The pressure dependence of the structural parameters of both room- and…
Crystal Structure and Local Dynamics in Tetrahedral Proton-Conducting La1-xBa1+xGaO4
2010
La1-xBa1+xGaO4-0 (LBG) compounds, based on unconnected GaO4 moieties, were recently proposed as proton conductors. Protonic defects in the lattice are inserted through self-doping with Ba2+, to create oxygen vacancies subsequently filled by hydroxyl ions. We present a combined structural analysis on self-doped LBG using X-ray diffraction (XRD) and X-ray absorption (EXAFS): these results unravel the finer structural details on the short-range and long-range scales, and they are correlated with the dynamical properties of protonic conduction coming from vibrational spectroscopy. The structure of the GaO4 groups is independent of the oxide composition. On hydration, an array of short intertetr…
Intervención psicológica a candidatos de cirugía bariátrica en un hospital público de Brasil
2016
Se investigó un programa de intervención psicológica a pacientes candidatos a cirugía bariátrica, evaluando estrategias de afrontamiento adoptadas, manifestaciones de ansiedad y cambios de estilo de vida, comparándolos a un grupo control. El programa cognitivo-conductual consiste en doce sesiones de grupo en el que se abordan cuestiones relacionadas con el proceso de cambio de hábitos y la preparación para la cirugía. La comparación entre las evaluaciones pre y posintervención y entre grupos mostró tendencias de mejoría en el grupo experimental; sin embargo, las variables de ansiedad empeoraron en algunos pacientes. Se destaca la importancia del tratamiento psicológico continuo como promoto…
Traslitterazioni sintattiche: il ciclo barese
2014
Il ciclo delle opere progettate da Guido Canella per la città di Bari occupa un arco temporale di oltre un decennio – dal 1991 al 2006 – e riguarda: il prototipo di Casa bifamiliare nel complesso residenziale di Barialto a Casamassima, del 1991; il progetto di Chiesa nello stesso complesso residenziale, del 1993; il progetto per i concorsi di primo e secondo grado per la Nuova sede municipale nell’area dell’ex gasometro, che si estende dal 1998 al 2001 e, infine, il progetto di Chiesa ecumenica, con Facoltà teologica, convento ortodosso e centro accoglienza a Punta Perotti, realizzato nell’ambito della decima Mostra Internazionale di Architettura di Venezia del 2006. Lo si definisce ciclo, …
Dopant-Host oxide interactions and proton mobility in Gd:BaCeO3
2009
The local structure of Gd:BaCeO3 at different dopant concentrations (2-20%) was studied by X-ray absorption spectroscopy. The EXAFS analysis shows that the environment of the regular Ba2+ and Ce4+ cations is to a limited extent affected by doping. The local structure of gadolinium shows an expansion of the first coordination shell of oxygens, consistent with the ionic radius of Gd3+, but a contraction of the next neighboring shells of cations. In particular, the Ba2+ second neighbors get closer to the dopant, which can be originated by the effective negative charge sharply localized on the dopant. Comparison between EXAFS data of dry and hydrated compounds confirms this interpretation, show…
Latvijas Tautas frontes piemiņas plāksne
2020
Raksts izveidots, balstoties uz 2020. gada novembra mēneša priekšmetu. Mēneša priekšmets ir izvēlēts, aktualizējot 1991. gada Barikāžu 30 gadskārtu, skatoties LU vēstures kontekstā. Tiek analizēta un vērtēta LU loma LTF darbībā un tās cīņā par neatkarīgas Latvijas valsts atjaunošanu PSRS pēdējās pastāvēšanas laikā. Pielikumā rakstam nāk audio intervijas ar LTF LU nodaļas biedriem, kuri dalās savos pieredzes stāstos par vētrainajiem Trešās atmodas notikumiem LU un LU saimes attieksmi pret tiem.
(Table 1) Trace element/Ca ratios of Orbulina universa shells from late Neogene Mediterranean samples
2008
A Mediterranean composite sedimentary record was analyzed for Ba/Ca ratios on carbonate shells of Orbulina universa planktonic foraminifer (Ba/Ca)carb providing the opportunity to study and assess the extent of freshwater inputs on the basin and possible impacts on its dynamics during the Tortonian to Recent period. A number of scanning electron microscope analyses and auxiliary trace element measurements (Mn, Sr, and Mg), obtained from the same samples, exclude important diagenetic effects on the studied biogenic carbonates and corroborate the reliability of (Ba/Ca)carb ratios in foraminifera calcite as indicators of seawater source components during the studied interval. A long-term trend…
Protective intraoperative ventilation with higher versus lower levels of positive end-expiratory pressure in obese patients (PROBESE): study protocol…
2017
Background Postoperative pulmonary complications (PPCs) increase the morbidity and mortality of surgery in obese patients. High levels of positive end-expiratory pressure (PEEP) with lung recruitment maneuvers may improve intraoperative respiratory function, but they can also compromise hemodynamics, and the effects on PPCs are uncertain. We hypothesized that intraoperative mechanical ventilation using high PEEP with periodic recruitment maneuvers, as compared with low PEEP without recruitment maneuvers, prevents PPCs in obese patients. Methods/design The PRotective Ventilation with Higher versus Lower PEEP during General Anesthesia for Surgery in OBESE Patients (PROBESE) study is a multice…
SEA LEVEL CHANGES DURING THE HOLOCENE IN MALTA AND BARI, CENTRAL MEDITERRANEAN
2012
During the last decade several papers have been published to estimate the relative sea-level change from coastal archaeological indicators in many locations of the Italian coasts and the Mediter-ranean Sea. Anyway, the use of the archaeological information has been poorly focused for Middle Ages and the Bronze Age, due to a few of available coastal installations for these periods. In this paper, we focus on two areas of the Mediterranean, namely the coasts of Malta island and Bari, in Apulia (Southern Italy), that displays coastal archaeological markers of the Bronze age and Middle ages, respectively. The elevation of the selected markers were compared against the latest model prediction of…
Local environment of Barium, Cerium and Yttrium in BaCe1−xYxO3−δ ceramic protonic conductors
2007
Abstract Y-doped barium cerate protonic conductors with composition BaCe 1 − x Y x O 3 − δ ( x = 0.02, 0.1, 0.2, 0.3) have been synthesized by sol–gel route, giving by X-ray diffraction tests a homogeneous crystalline phase. A commercial sample BaCe 0.8 Y 0.2 O 3 − δ produced by combustion spray pyrolysis was also provided for comparison aim. The local structure around the cations was studied by X-ray absorption spectroscopy at the K-edges of Ba, Ce and Y. It is demonstrated that the insertion of yttrium in the site of cerium produces a remarkable local distortion of the dopant first-shell octahedral environment that affects also the next coordination shells by a static disorder increas…