Modified algebraic Bethe ansatz for XXZ chain on the segment - III - Proof

In this paper, we prove the off-shell equation satisfied by the transfer matrix associated with the XXZ spin-$\frac12$ chain on the segment with two generic integrable boundaries acting on the Bethe vector. The essential step is to prove that the expression of the action of a modified creation operator on the Bethe vector has an off-shell structure which results in an inhomogeneous term in the eigenvalues and Bethe equations of the corresponding transfer matrix.Comment: V2 published version, 16 page

Basal-plane Incommensurate Phases in HCP Structures

An Ising model with competing interaction is used to study the appearance of incommensurate phases in the basal plane of an hexagonal closed-packed structure. The calculated mean-field phase diagram reveals various 1q-incommensurate and lock-in phases. The results are applied to explain the basal-plane incommensurate phase in some compounds of the A'A"BX_4 family, like K_2MoO_4, K_2WO_4, Rb_2WO4 and to describe the sequence of high-temperature phase transitions in other compounds of this family.Comment: 8 pages, RevTeX + 4 ps figure

The Yang-Baxter equation for PT invariant nineteen vertex models

We study the solutions of the Yang-Baxter equation associated to nineteen vertex models invariant by the parity-time symmetry from the perspective of algebraic geometry. We determine the form of the algebraic curves constraining the respective Boltzmann weights and found that they possess a universal structure. This allows us to classify the integrable manifolds in four different families reproducing three known models besides uncovering a novel nineteen vertex model in a unified way. The introduction of the spectral parameter on the weights is made via the parameterization of the fundamental algebraic curve which is a conic. The diagonalization of the transfer matrix of the new vertex model and its thermodynamic limit properties are discussed. We point out a connection between the form of the main curve and the nature of the excitations of the corresponding spin-1 chains.Comment: 43 pages, 6 figures and 5 table

LATTES: a novel detector concept for a gamma-ray experiment in the Southern hemisphere

The Large Array Telescope for Tracking Energetic Sources (LATTES), is a novel concept for an array of hybrid EAS array detectors, composed of a Resistive Plate Counter array coupled to a Water Cherenkov Detector, planned to cover gamma rays from less than 100 GeV up to 100 TeVs. This experiment, to be installed at high altitude in South America, could cover the existing gap in sensitivity between satellite and ground arrays. The low energy threshold, large duty cycle and wide field of view of LATTES makes it a powerful tool to detect transient phenomena and perform long term observations of variable sources. Moreover, given its characteristics, it would be fully complementary to the planned Cherenkov Telescope Array (CTA) as it would be able to issue alerts. In this talk, a description of its main features and capabilities, as well as results on its expected performance, and sensitivity, will be presented.Comment: Proceedings of the 35th International Cosmic Ray Conference (ICRC2017), Busan, South Korea. Presented by R. Concei\c{c}\~{a}o. 8 pages; v2: correct affiliation + journal referenc

The influence of work characteristics in the quality of life of mental health professionals

Artigo baseado numa dissertação realizada no âmbito do Mestrado de Gestão das Organizações – Ramo de Gestão de Unidades de Saúde da Associação de Politécnicos do NorteIntrodução: Os profissionais da área de saú - de mental são o principal instrumento de in- tervenção nesta área considerada prioritária em Saúde Pública e estão sujeitos a desgaste emocional e stress, que podem afetar negati- vamente a sua qualidade de vida. Objetivos: Com este estudo pretende-se ava- liar a influência de características de trabalho na qualidade de vida relacionada com a saúde dos profissionais de saúde mental. Métodos: Para responder ao objetivo traçado optámos por realizar um estudo observacional analítico transversal, com abordagem quanti- tativa. Utilizámos o SF-36v2 como instrumen- to genérico de avaliação da Qualidade de Vida, que já se encontra validado para a população portuguesa, complementado por um questio- nário socioprofissional. A recolha de dados de - correu de 28 de Janeiro a 30 de Abril de 2013. Resultados e Conclusões: A amostra foi constituída por 201 profissionais de saúde mental de Portugal Continental. A qualidade de vida relacionada com a saúde mostra dife- renças estatísticas significativas no estudo de grupos de profissionais de acordo com o nú - mero de horas de trabalho semanal (p=0.04) e o grau de satisfação profissional ( p<0.001). A avaliação da qualidade de vida dos profissio - nais de saúde mental possibilita a implemen- tação de alterações no funcionamento dos serviços de saúde mental, podendo contribuir para uma melhoria na prestação dos cuidados de saúde aos utente