Neutrino mixing in a left-right model

We study the mixing among different generations of massive neutrino fields in a $SU(2)_L \times SU(2)_R \times U(1)_Y$ gauge theory which includes Majorana and Dirac mass terms in the Yukawa sector. Parity can be spontaneously broken at a scale $v_R\simeq 10^3-10^4$ GeV. We discuss about possible candidates for the Yukawa coupling matrices and we found that the model can accommodate a consistent pattern for neutral fermion masses as well as neutrino oscillations. The left and right sectors can be connected by a new neutral current.Comment: 9 page

The Impulsive Phase in Solar Flares: Recent Multi-wavelength Results and their Implications for Microwave Modeling and Observations

This short paper reviews several recent key observations of the processes occurring in the lower atmosphere (chromosphere and photosphere) during flares. These are: evidence for compact and fragmentary structure in the flare chromosphere, the conditions in optical flare footpoints, step-like variations in the magnetic field during the flare impulsive phase, and hot, dense 'chromospheric' footpoints. The implications of these observations for microwaves are also discussed.Comment: 6 pages, 5 figures, presented at 'Solar Physics with Radio Observations' Symposium, November 2012, Nagoya, Japa

Nonsmooth stabilizability and feedback linearization of discrete-time nonlinear systems

We consider the problem of stabilizing a discrete-time nonlinear system using a feedback which is not necessarily smooth. A sufficient condition for global dynamical stabilizability of single-input triangular systems is given. We obtain conditions expressed in terms of distributions for the nonsmooth feedback triangularization and linearization of discrete-time systems. Relations between stabilization and linearization of discrete-time systems are given

Fermion masses in a model for spontaneous parity breaking

In this paper we discuss a left-right symmetric model for elementary particles and their connection with the mass spectrum of elementary fermions. The model is based on the group $SU(2)_L\otimes SU(2)_R\otimes U(1)$. New mirror fermions and a minimal set of Higgs particles that breaks the symmetry down to $U(1)_{em}$ are proposed. The model can accommodate a consistent pattern for charged and neutral fermion masses as well as neutrino oscillations. An important consequence of the model is that the connection between the left and right sectors can be done by the neutral vector gauge bosons Z and a new heavy Z'.Comment: 7 pages, 3 figures. Accepted in Eur. Phys. J.

Nautical Tourism in Medio Tejo (Portugal): the wakeboard activity

Nautical tourism is a growing product in Portugal, following a long tradition related to aquatic products. The wakeboard activity gained important visibility, especially due to the rst world championship, in 2017, on the Zêzere river. The study now presented focuses mainly on the importance of valuing river-water resources and the Zêzere river, through wakeboard activity, for the consolidation of an e cient tourism product in the dynamic promotion of tourist and cultural attractiveness. For this purpose, as a methodology, a questionnaire survey was applied in areas of the Zêzere river equipped with a cable park, to understand the importance of wakeboarding in the development of river tourism in the territory. This study aims to enrich the knowledge of the wakeboard activity integrated into the nautical tourist product of the Medio Tejo. The results point to a growing trend in demand for this activity by residents and tourists, who combine leisure with knowledge of the heritage resources (material and immaterial) of this territory. The appreciation of the activity can lead local agents and actors to know and invest in the territory, making wakeboarding an activity of great economic, social, cultural, and environmental importance, contributing to the promotion and development of this territory.info:eu-repo/semantics/publishedVersio

A Conceptual Framework Proposal Regarding the Engagement of Hotels in the Modern Fight against Unsustainable Food Practices

The ecological crisis that emerged rapidly in the 2000s because of vertiginous economic growth is still one of the dominant themes today. This unprecedented phenomenon has led to intense political-economic and social tensions over reconsidering the priorities of “post-industrial capitalism”. The main issues here are increasing inequalities in the distribution of resources and high dependence on non-renewable energies. In response, valuable policies have been developed with the intention of creating new economic models that satisfy environmental and ecological needs. However, the literature shows that the effectiveness of the global schemes proposed to achieve sustainable behaviors and techniques has been very low. In the hospitality sector, particularly in the food and beverage department, pollution and consumption of scarce resources remain issues. In this paper, we propose a structural framework for analyzing the commitment of hotels regarding sustainable practices in the F&B department, centered on standards set by relevant institutions. To enhance understanding, an extension of the theory of planned behavior (TPB) is proposed. The use of this conceptual framework will enable us firstly to gain a perception of how a hotel acts through its F&B administrator in the light of relevant standard practices. Secondly, it will allow us to understand the role of the common internal and external factors behind the theories describing the behavior adopted. In this way, this research aims to contribute to a global understanding of the factors that influence the commitment of hotels to sustainable practices in their F&B department.info:eu-repo/semantics/publishedVersio

Stochastic evaluation of sewer inlet capacity on urban pluvial flooding

In this paper we present an innovative methodology to stochastically assess the impact of sewer inlet conditions on urban pluvial flooding. The results showed that sewer inlet capacity can have a large impact on the occurrence of urban pluvial flooding. The methodology is a useful tool for dealing with uncertainties in sewer inlet operational conditions and contribute to comprehensive assessment of urban pluvial risk assessment