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Este artigo investigou se a divulgação das recomendações dos analistas financeiros afeta igualmente às ações negociadas na Bolsa de Valores de São Paulo. Fundamento: Os investidores racionais, ao tomarem suas decisões, consideram inúmeras informações. Parte destas são confeccionadas por analistas financeiros, as quais exercem um papel crítico sobre a volatilidade dos preços dos ativos. Esse fenômeno foi constatado por Stickel (1995) e Womack (1996). Contudo, a Hipótese do Mercado Eficiente salvaguarda um pensamento distinto. Preconiza que nenhum investidor, apropriando-se de informações, é capaz de alcançar ganhos excedentes. Assim, o não consenso dos trabalhos empíricos põe essa temática como um eixo teórico ainda em construção na literatura. Método: Os procedimentos metodológicos empregados voltaram-se ao estudo de evento, contando com a análise de um conjunto de dezoito ações negociadas no mercado brasileiro. Resultados: Dentre os achados, foi percebido um comportamento incongruente entre os ganhos médios proporcionados pelos ativos e os pareceres emitidos pelos especialistas. Após a data em que ocorreu a mudança de recomendação, os retornos diários anormais médios foram predominantemente negativos ao passo que as orientações dos analistas apontaram para a compra de ativos. Essa tendência manteve-se nas análises desenvolvidas a partir das janelas (3, 7 e 11 dias) e dos retornos diários médios por ação. No entanto, constatou-se que a maior fração dos retornos anormais não foram significantes. Houve a sustentação da hipótese de que o mercado brasileiro de ações manifesta-se de forma semelhante após a divulgação das recomendações consensuais de analistas. Reforça, assim, os postulados de Fama (1970). Contribuições: Os insights acadêmicos permitem alargar a discussão sobre a maneira como os preços dos ativos se posicionam após a divulgação de informações de especialistas. Isso oferta subsídios sobre quais dados os investidores devem considerar nos atos de decisões de investimento. Palavras-chave: Recomendações consensuais. Retornos anormais. Mercado brasileiro.

This study presents the context of the creation and development of actions of the Geoparks Commission of the Brazilian Society of Geology (CG-SBG). For this, documentary research of the entity’s minutes and existing records in other media was carried out. The results show that the commission has positioned itself as a channel for institutional, political, and social mobilization relative to the topic of geoparks in Brazil, following the objectives established in the CG-SBG bylaws, namely: (a) awaken and conduct debates and reflections on geoparks within SBG; (b) share knowledge about the context and performance of geoparks with the national society, government institutions, and entities of common interest with this topic through publication in its most diverse media; (c) work to benefit the dissemination and implementation of geoparks in Brazil; (d) integrate representatives of the various proposals for geoparks in Brazil and; (e) propose institutional support to geoparks implementation projects in the national territory. In addition, many representatives of regional branches on the commission also form teams of aspirants and geopark projects, further facilitating the interaction between the proposals and the joint discussions. Among the actions carried out is the participation of the commission in several regional, national, and international events, the provision of information through a website, and the manifestation on issues related to geoparks, such as the need to create a National Geoparks Committee, as provided for byUNESCO, in accordance with the statutes of the International Geoscience and Geoparks Programme and guidelines of the UNESCO Global Geoparks (IGGP/2015/ST), to monitor the development of projects and act jointly with UNESCO and aspiring geoparks. Thus, this study concludes that although the commission exists within the scope of a scientific society, it has carried out actions that contribute to the strengthening of the topic of geoparks in various segments of Brazilian society, from the municipalities to national policies.

In this work, molecular models were obtained, and the reactivity parameters of ε-caprolactam and ophenanthroline were calculated to evaluate the interaction in the formation of complex molecular compounds. It was observed that the main electron donor atoms, in the formation of the metal-ligand bond, are centered mainly on the oxygen and nitrogen atoms, respectively, which are sterically more favorable in these species. Conductance measurements in an aqueous solution were obtained to observe the electrolytic behavior of these compounds. Infrared spectra were also recorded to characterize vibrational transitions in identifying these species when present in complex systems. Molecular spectra of absorption in the UV-visible region were recorded to evaluate the spectrochemical properties of these individual ligands and further verify their influence on the formation of complex molecular systems. The parameters evaluated include the molar absorptivity ε, integrated absorption coefficient, oscillator force, and transition dipole moment. It was observed that the ε parameter indicates molecular transitions in the 190 – 300 nm region and the near-infrared, and the oscillator strength is typical of molecules used as dyes and sensitizers for optical light-emitting systems or light-to-electricity converters.

This Special Issue on Geoconservation brings relevant contributions from Brazilian researchers on topics ranging from data collection to geoscientific outreach. The ten selected papers were initially presented as abstracts at the V Brazilian Symposium on Geological Heritage, held in Crato, Ceará, from October 14 to 18, 2019.