4 research outputs found
Lanthanum doped titania decorated with silver plasmonic nanoparticles with enhanced photocatalytic activity under UV-visible light
Lanthanum doped titanium dioxide decorated with silver plasmonic nanoparticles (Ag-La/TiO2 NPs) materials were prepared using a simple ultrasound-assisted wet impregnation method followed by silver photodeposition. The obtained photocatalysts with different Ag contents were characterized by XRD, FE-SEM, EDX, TEM, BET, XPS, DRS and PL techniques. Moreover, the size distribution of the nanoparticles aggregates was assessed. The characterization analysis revealed that La doping slightly changed the crystalline phase of TiO2, increased the amount of surface hydroxyl groups and interacted with TiO2 nanoparticles via Ti–O–La bond, while Ag photodeposition enhanced the absorption of visible light due to the effects of localized surface plamon resonance and significantly decreased electronic recombination rate by the Schottky junction. Furthermore, the combination of Ag-La induced the formation of oxygen vacancies, which increased the amount of adsorbed surface hydroxyl groups in Ag-La/TiO2. In addition, Ag-La possibly decreased the semiconductor surface energy, which acted positively in the reduction of NPs aggregation. These features along with better textural properties (greater surface areas) played a fundamental role in the enhancement of the photocatalytic activity of Ag-La/TiO2 composites for the decolorization of methylene blue under UV-visible irradiation compared to the mono-metallic (La/TiO2 and Ag/TiO2) modified photocatalysts. Finally, a mechanism for the transfer of charge carriers in Ag-La/TiO2 photocatalyst under UV-visible irradiation was proposed
O novo desenvolvimentismo e a decadência ideológica do pensamento econômico brasileiro The new developmentalism and the ideological decadence of the Brazilian economic thinking
No neoliberalismo, o Brasil experimenta uma nova fase do desenvolvimento capitalista que se inicia nos governos FHC e se aprofunda sob a direção dos governos Lula e Dilma. Na esteira das transformações estruturais, constata‑se o surgimento de uma ideologia que se propõe como guia dos rumos do desenvolvimento capitalista brasileiro, o novo desenvolvimentismo. O presente artigo é uma contribuição à crítica da economia política brasileira contemporânea, explicitando seus limites a partir do conceito marxiano (e luckásiano) de decadência ideológica.<br>In neoliberalism times, Brazil has experienced a new phase of capitalist development that began in FHC's era and deepened under Lula and Dilmas's leadership. Following the structural changes, there is the emergence of an ideology as a guide to direct the capitalist development in Brazil - the new developmentalism. This article is a contribution to the critique of contemporary Brazilian political economy, and it explains its limits from the Marxian's (and luckasian) concept of ideological decadence
Open data from the first and second observing runs of Advanced LIGO and Advanced Virgo
Advanced LIGO and Advanced Virgo are monitoring the sky and collecting gravitational-wave strain data with sufficient sensitivity to detect signals routinely. In this paper we describe the data recorded by these instruments during their first and second observing runs. The main data products are gravitational-wave strain time series sampled at 16384 Hz. The datasets that include this strain measurement can be freely accessed through the Gravitational Wave Open Science Center at http://gw-openscience.org, together with data-quality information essential for the analysis of LIGO and Virgo data, documentation, tutorials, and supporting software