Very Singular Similarity Solutions and Hermitian Spectral Theory for Semilinear Odd-Order PDEs

Very singular self-similar solutions of semilinear odd-order PDEs are studied on the basis of a Hermitian-type spectral theory for linear rescaled odd-order operators.Comment: 49 pages, 12 Figure

Spin-Driven Nematic Instability of the Multi-Orbital Hubbard Model: Application to Iron-Based Superconductors

Nematic order resulting from the partial melting of density-waves has been proposed as the mechanism to explain nematicity in iron-based superconductors. An outstanding question, however, is whether the microscopic electronic model for these systems -- the multi-orbital Hubbard model -- displays such an ordered state as its leading instability. In contrast to usual electronic instabilities, such as magnetic and charge order, this fluctuation-driven phenomenon cannot be captured by the standard RPA method. Here, by including fluctuations beyond RPA in the multi-orbital Hubbard model, we derive its nematic susceptibility and contrast it with its ferro-orbital order susceptibility, showing that its leading instability is the spin-driven nematic phase. Our results also demonstrate the primary role played by the $d_{xy}$ orbital in driving the nematic transition, and reveal that high-energy magnetic fluctuations are essential to stabilize nematic order in the absence of magnetic order.Comment: 8 pages, 6 figure

Recomendações para manejo da podrigão-do-pé em batata-doce.

bitstream/item/57209/1/Cot-79.pd

Recording from two neurons: second order stimulus reconstruction from spike trains and population coding

We study the reconstruction of visual stimuli from spike trains, recording simultaneously from the two H1 neurons located in the lobula plate of the fly Chrysomya megacephala. The fly views two types of stimuli, corresponding to rotational and translational displacements. If the reconstructed stimulus is to be represented by a Volterra series and correlations between spikes are to be taken into account, first order expansions are insufficient and we have to go to second order, at least. In this case higher order correlation functions have to be manipulated, whose size may become prohibitively large. We therefore develop a Gaussian-like representation for fourth order correlation functions, which works exceedingly well in the case of the fly. The reconstructions using this Gaussian-like representation are very similar to the reconstructions using the experimental correlation functions. The overall contribution to rotational stimulus reconstruction of the second order kernels - measured by a chi-squared averaged over the whole experiment - is only about 8% of the first order contribution. Yet if we introduce an instant-dependent chi-square to measure the contribution of second order kernels at special events, we observe an up to 100% improvement. As may be expected, for translational stimuli the reconstructions are rather poor. The Gaussian-like representation could be a valuable aid in population coding with large number of neurons

The AGN properties of the starburst galaxy NGC 7582

NGC 7582 was identified as a Starburst galaxy in the optical \cite[(Veron et al. 1981)]{Veron et al.(1981)} but its X-Ray emission is typical of a Seyfert 1 galaxy \cite[(Ward et al. 1978)]{Ward et al.(1978)}. We analyzed a datacube of this object obtained with the GMOS-IFU on the Gemini-South telescope. After a subtraction of the stellar component using the {\sc starlight} code \cite[(Cid Fernandes et al. 2005)]{Cid Fernandes et al. (2005)}, we looked for optical signatures of the AGN. We detected a broad $H\alpha$ component (figure \ref{fig1}) in the source where \cite[Bianchi et al.(2007)]{Bianchi et al.(2007)} identified the AGN in an HST optical image. We also found a broad $H\beta$ feature (figure \ref{fig2}), but its emission reveals a extended source. We suggest that it is the light of the AGN scattered in the ionization cone. We propose that NGC 7582 is a Seyfert 1 galaxy. A number of other "hot-spots" and Wolf-Rayet features were also identified.Comment: 1 page, 2 figures, to be published in the Proceedings of the IAU Symposium no. 26

Validation of the Hospitality Culture Scale in the context of hotel industry

This study aims to validate the final factors for the Organizational Culture of the Hospitality Culture Scale which consists of the following four dimensions: management principles, customer relationships, job variety, and job satisfaction in the context of hotel industry organizations both in Brazil and Portugal. To this end, a confirmatory factor analysis (CFA) was performed, where two hundred and fifty-nine hotel industry professionals were rated. The presented results support a structure with three factors and eighteen items. It was concluded that the factor "job satisfaction" does not contribute to the formation of the OC construct. It is understood that an appropriate OC to the hospitality environment can make employees feel valued, which can impact job satisfaction, but job satisfaction cannot be considered part of the values shared by members of an organizationinfo:eu-repo/semantics/publishedVersio

Water balance climatology under conditions of future climate scenarios in the Pantanal Nhecolândia, Brazil.

The objective of this work is to investigate the behavior of water conditions due to global warming analyzing future water availability for the Pantanal Sul Mato-grossense.(Embrapa Gado de Corte. Documentos, 216). Coordenador Roberto Giolo de Almeida. II SIGEE. Disponível em: . Acesso em: 01 dez. 2016

Equal opportunities, fair work and social protection: Impacts of COVID-19 on young people in Portuguese rural territories

Several international organizations, as well as worldwide scholarship, have abundantly shown that young people under 34 are among the groups struggling the most with COVID-19 economic and social impacts. Seldom, however, does scholarship focus on the uneven effects of the pandemic on younger generations across different types of territories. Overall, young people in rural territories tend to face much greater adversities. These territories concentrate less population, show strong ageing trends trend and depict a lower settlement rate. Rural younger generations struggle to strive, because rural areas depend heavily on declining economic activities such as farming, are plagued by precarious jobs, and display limited institutional support compared to (sub)urban areas. In Portugal, the country’s population is unevenly distributed between affluent, high-density coastal areas and inlands and archipelagos with a considerable rural predominance. The COVID-19 crisis has the potential to further stretch the existing inequalities among young people due to spatial distribution. Therefore, in this chapter, we discuss the impact of the recent pandemic crisis on rural Portuguese young people. We will do so by characterizing headline indicators in the three domains of the European Pillar of Social Rights, namely equal opportunities (e.g., Early School Leavers from Education and Training), fair working conditions (e.g., Youth Unemployment), and social protection and inclusion (e.g., at risk of poverty and social exclusion). We expect to reach an initial comprehension of the challenges faced by rural Portuguese young people in the aftermath of the COVID-19 crisis in three domains: education, employment and social inclusion. We also discuss how more nuanced territorial conceptualizations (e.g., low-density areas) and policymaking can add alternative views about young people’s living conditions due to subnational disparities.info:eu-repo/semantics/acceptedVersio

Internationalization of board members and compliance with mandatory disclosure: Empirical study of IFRS 3 (business combinations) in Brazil

The determinants tested in the mandatory disclosure are usually about business and cultural factors. However, the board members have a strong power of decision on the information disclosed, so it is natural that the characteristics of board members can influence the fulfillment of disclosure. This study analyses the level of compliance with IFRS 3 and examines whether it is influenced by the level of internationalization of board members. Our results indicate a moderate level of compliance, which is greater the greater the weight of foreign board members and the weight of board members with training abroad.info:eu-repo/semantics/publishedVersio