Radiative production of the Lambda(1405) resonance in K collisions on protons and nuclei

We have carried a theoretical study of the K^- p\to M B \gamma reaction with M B = K^-p, \bar{K}^0 n, \pi^- \Sigma^+, \pi^+ \Sigma^-, \pi^0 \Sigma^0, \pi^0 \Lambda, for K^- lab. momenta between 200 and 500 MeV/c, using a chiral unitary approach for the strong K^-p interaction with its coupled channels. The \Lambda(1405) resonance, which is generated dynamically in this approach, shows up clearly in the d\sigma/dM_I spectrum, providing new tests for chiral symmetry and the unitary approach, as well as information regarding the nature of the resonance. The photon detection alone, summing all channels, is shown to reproduce quite accurately the strength and shape of the \Lambda(1405) resonance. Analogous reactions in nuclei can provide much information on the properties of this resonance in a nuclear medium.Comment: 11 pages, 3 postscripts figure

Análise da variação temporal da precipitação mensal na Bacia do Rio Pontal em Pernambco.

A determinação prévia da variação de elementos climatológicos ao longo do ano é de interesse do planejamento e de previsão de cenários na agricultura. Assim, este trabalho teve por objetivo avaliar a variabilidade temporal da precipitação pluvial na Bacia do Rio Pontal, nos municípios de Petrolina e Afrânio, em Pernambuco, utilizando técnicas geoestatísticas. Foram utilizados os dados das ocorrências mensais de chuva em cinco estações meteorológicas, pertencentes à Embrapa Semiárido e Agência Nacional de Águas. Observou-se que tais ocorrências apresentaram dependência temporal utilizando o variograma como ferramenta de análise

Una nueva especie del género Chomelia (Rubiaceae, Guettardeae) en México

Abstract A new species of Chomelia is described; at this time it has been collected only at the type locality. It is similar to the Mexican-Mesoamerican species Chomelia longituba (Borhidi) Borhidi, but can be easily distinguished by the position of the inflorescence, by the form of the stigma lobes and the size of the fruit

Variabilidade espacial de atributos físicos do solo no perímetro irrigado pontal sul, em Petrolina, PE.

O conhecimento da variabilidade espacial das propriedades físicas do solo, em particular as relacionadas à distribuição granulométrica, que influenciam o fluxo superficial e o movimento de água no solo, contribuem na definição de melhores estratégias para o manejo sustentável do solo e é fundamental para o planejamento ambiental. O trabalho teve como objetivo estudar a variação espacial das frações granulométricas do solo na área do perímetro de irrigação do Pontal Sul e confeccionar modelos de distribuição espacial destas frações. Os percentuais das frações granulométricas apresentaram dependência espacial forte para areia, silte e argil

AGE Survey: a tool to support the study and intervention on health and age at work

The complex relationship between age and work goes beyond the association between the exposure to risk factors and early ageing. Only few studies attempt to encompass this complexity and try to put this discussion in a temporal dimension, considering the developments of health and work over lifetime. This proposal presents some results of a study conducted in Portugal about working conditions, occupational risks and health problems. European studies, as ESTEV and VISAT, both in France, used a longitudinal design with repeated measures in order to monitor health issues taking into account job modifications and age evolution. From these experiences, other studies were performed in this field, with less extensive instruments, for example the SVP50 and EVREST. In Portugal we developed the first survey on health and age – AGE– based on the previous experiences and supported by the strong network between researchers from these groups. The first AGE data collection was conducted in 2016, in collaboration with the National Authority for Working Conditions. The survey was administrated by labour inspectors in their regular visits to companies, with 3106 surveyed workers. AGE dimensions focus on: working conditions (working time, schedules, demands/resources, perceived risks); health complaints and the perceived (by workers) relationship between these problems and their work, in order to analyse the relationship between age, health and work; and questions about retirement expectations, in order to identify retirement predictors. The results show interesting relations between working conditions and the health problems identified by workers and, with strong evidences that age plays a key role in the capacity to recognise the connexion between work constraints and health problems. Results also show different tendencies related to both perceived expositions and perceived health problems for different age groups, emphasising the need to consider the specificity of diverse situations in the moment of intervention. Findings also show that these health problems are frequently reported by workers, as related to their work, mostly in work situations of co-exposition (when workers are exposed to several constrains at the same time). The association of different constraints seem to be particularly hard for workers, due to the high proportion of reported health problems.info:eu-repo/semantics/acceptedVersio