Geologia e educação ambiental : a aprendizagem baseada na resolução de problemas como proposta metodológica

ara além de destacar o papel da geologia na educação ambiental (dimensão educativa de carácter transversal), o presente estudo apresenta a Aprendizagem Baseada na Resolução de Problemas como uma proposta metodológica para educar para o desenvolvimento sustentável. Nesse sentido, apresentam-se alguns dos resultados obtidos com a aplicação de um programa de intervenção realizado com 24 alunos do 3ºciclo do ensino básico (faixa etária dos 12-15 anos) e abordando a temática “Gestão Sustentável dos Recursos” Para além de 10 aulas de 45 minutos o programa contemplou uma saida de campo a uma antiga exploração mineira, local geologicamente relevante em termos de gestão sustentável de recursos minerais

Lower Mass Bound on the W′W^\prime mass via Neutrinoless Double Beta Decay in a 3-3-1 Model

The discovery of neutrino masses has raised the importance of studies in the context of neutrinoless double beta decay, which constitutes a landmark for lepton number violation. The standard interpretation is that the light massive neutrinos, that we observed oscillating in terrestrial experiments, mediate double beta decay. In the minimal 3-3-1 model, object of our study, there is an additional contribution that stems from the mixing between a new charged vector boson, $W^{\prime}$, and the Standard Model W boson. Even after setting this mixing to be very small, we show that tight constraints arise from the non-observation of neutrinoless double beta decay. Indeed, we derive bounds on the mass of the $W^{\prime}$ gauge boson that might exceed those from collider probes, and most importantly push the scale of symmetry breaking beyond its validity, leading to the exclusion of the minimal 3-3-1 model.Comment: 16 pages, 5 figure

Transmission Of Optical Coherent State Qubits

We discuss the long distance transmission of qubits encoded in optical coherent states. Through absorption these qubits suffer from two main types of errors, the reduction of the amplitude of the coherent states and accidental application of the Pauli Z operator. We show how these errors can be fixed using techniques of teleportation and error correcting codes.Comment: Added two pages of explanation/background/review material to increase readability and clarity. Corrected minor typographical and linguistic error

Non-linear effects on radiation propagation around a charged compact object

The propagation of non-linear electromagnetic waves is carefully analyzed on a curved spacetime created by static spherically symmetric mass and charge distribution. We compute how non-linear electrodynamics affects the geodesic deviation and the redshift of photons propagating near this massive charged object. In the first order approximation, the effects of electromagnetic self-interaction can be distinguished from the usual Reissner-Nordstr\"om terms. In the particular case of Euler-Heisenberg effective Lagrangian, we find that these self-interaction effects might be important near extremal compact charged objects.Comment: 7 pages, no figures, new references added, minor corrections in some equation

Propagação assexuada da cana-do-reino (Arunda donax L.)

bitstream/item/31272/1/comunicado-158.pd

Pregnancy with autoimmune hepatitis

AIM: The aim of this study was to review our experience with gestations in autoimmune hepatitis patients. BACKGROUND: There are only limited data describing pregnancy in patients with autoimmune hepatitis. PATIENTS AND METHODS: Retrospective analysis of pregnancies with autoimmune hepatitis followed in Centro Hospitalar do Porto, Portugal in the last ten years. RESULTS: We reported nine pregnancies in seven patients with autoimmune hepatitis. Two patients had documented liver cirrhosis prior to the pregnancy. In this study, 66.7% of patients were treated with azathioprine and 88.9% with prednisolone. Clinical improvements were observed in 11.1% of pregnancies and 22.2% exacerbations were diagnosed. There were six live births and two preterm deliveries (preterm delivery rate of 33%). We also report three first trimester miscarriages (early gestation miscarriage rate of 33%). There were no neonatal or maternal deaths. CONCLUSION: The favorable obstetric outcome is a realistic expectation in patients with autoimmune hepatitis. Tight monitoring and control of asymptomatic and unpredictable exacerbations, which are unrelated to the severity of the underlying disease, are essential to the prognosis of the current pregnancyinfo:eu-repo/semantics/publishedVersio

Aplicação de uma escala de avaliação da aprendizagem de ciência no campo

This paper presents the results of applying a rating scale of learning science in the field. These studies were developed in the ambit a PhD project in progress which seeks to emphasize the importance of using the field work in research and teaching of geology and, somehow, the connection between geological research and pedagogical intervention (didactic transposition ). The application of the scale resulted from the performance of six field trips, with 8 high school classes Biology / Geology, having been obtained from a sample of 171 inquirie