Metodologia para o dimensionamento do reforço sísmico de edifícios

Neste artigo apresenta-se uma metodologia para o dimensionamento do reforço de edifícios existentes com estrutura em betão armado, sujeitos à acção sísmica. O método de análise é constituído por três fases: avaliação estrutural; avaliação da segurança estrutural e dimensionamento do reforço

Sobre a necessidade de consideração da componente vibração em projetos onde não é normalmente considerada

As componentes que são normalmente consideradas nas Avaliações de Impacte Ambiental, para um determinado tipo de projeto, estão mais ou menos bem definidas. No caso da componente Vibração é usual a sua consideração em projetos manifestamente vibráteis, nomeadamente projetos ferroviários e pedreiras. Contudo existem outros tipos de projetos, em que não é usual a consideração da componente Vibração, mas em que os impactes ambientais associados podem não ser negligenciáveis, nomeadamente projetos rodoviários, aeroportuários e parques eólicos. O objetivo da presente comunicação é assim explicitar e demonstrar a pertinência e necessidade de consideração da componente Vibração em outros tipos de projetos, que não os habituais, recorrendo a resultados de medições in situ de vibração, para esses tipos de projeto, e à informação bibliográfica, nacional e internacional, disponível sobre a matéria

Cuatro romances de Quevedo: modelos e imitaciones

Estudio de cuatro romances de Quevedo o a él atribuidos, en relación con otros similares anónimos y autónimos a fin de plantear su interdependencia, las vías y el orden de su difusión, la autenticidad de dos dudosos y, en uno más, el posible orden de versiones según la presencia o ausencia en ellas de diversas coplas. This article studies four romances by Quevedo or attributed to him compared with others very similar to them. The author tries to analyse the relationship among them, their diffusion and the authenticity of two doubtful. It is also studied in one of them the possible order of its versions according to the analysis of different strophes

Análise comparativa de medições de vibração e de isolamento sonoro em edifícios

No presente trabalho foram efetuadas medições de isolamento sonoro in situ, de acordo com as normas aplicáveis da série ISO 140, e medições de vibração dos elementos separadores em causa. Pretende-se comparar os resultados das medições diretas de isolamento sonoro com os resultados das previsões de isolamento sonoro, tendo por base as medições de vibração, de forma a verificar a viabilidade de aplicação desta metodologia na determinação mais rigorosa dos caminhos de propagação sonora entre espaços e da definição mais rigorosa, eficaz e direcionada das intervenções de melhoria de isolamento sonoro a efetuar, quando necessárias

Very Delayed Lupus Nephritis: a Report of Three Cases and Literature Review

Lupus nephritis (LN) affects up to 50% of patients with Systemic Lupus Erythematosus (SLE) and is associated with a worse prognosis. LN usually develops within the first 5 years of the onset of the disease. We report three patients with very delayed LN (DLN) diagnosed after 15 or more years after SLE diagnosis. The three patients were non-Caucasian women with adolescent or adult-onset SLE. Each had antinuclear, anti-dsDNA and anti-Ro antibodies. Hydroxychloroquine was prescribed for each. Their disease courses were characterised by sporadic non-renal flares controlled by steroids and, in two cases, by one cycle of rituximab. Unexpectedly, they developed proteinuria, haematuria and lowering of estimated glomerular filtration rate with clinical signs of renal disease. LN was confirmed by renal biopsy. Reviewing them, each showed serological signs of increasing disease activity (rising levels of anti-dsDNA antibodies and fall in C3) that predated clinical or laboratory signs of LN by 1-3 years. Reviewing the literature, we found a lack of knowledge about DLN starting more than 15 years after SLE diagnosis. With the increasing life expectancy of patients with SLE it is likely that more cases of very DLN will emerge.info:eu-repo/semantics/publishedVersio

Inverse Ising inference using all the data

We show that a method based on logistic regression, using all the data, solves the inverse Ising problem far better than mean-field calculations relying only on sample pairwise correlation functions, while still computationally feasible for hundreds of nodes. The largest improvement in reconstruction occurs for strong interactions. Using two examples, a diluted Sherrington-Kirkpatrick model and a two-dimensional lattice, we also show that interaction topologies can be recovered from few samples with good accuracy and that the use of $l_1$-regularization is beneficial in this process, pushing inference abilities further into low-temperature regimes.Comment: 5 pages, 2 figures. Accepted versio

MANAGEMENT STRATEGIES TO MITIGATE ENVIRONMENTAL IMPACT OF WEATHER UNCERTAINTY IN EFFLUENT APPLICATION TO IRRIGATED CORN IN SEMIARID REGIONS

This study compares subsurface drip irrigation and sprinkler irrigation with respect to expected returns, aquifer life, nutrient utilization and accumulation in the production of irrigated corn using swine effluent and fresh groundwater from a depleting aquifer in the Oklahoma Panhandle. Most of the equations estimated econometrically had heteroskedasticity problems and MLE was used. The econometric estimation of a PDF of ammonia volatilization dependent on amount of nitrogen applied, for each irrigation system, was successful and is the basis for developing a stochastic chain for the soil nitrogen carryover equation. The results of the stochastic dynamic programming model are still being developed and will be presented at the conference.Crop Production/Industries, Environmental Economics and Policy,

Are visual cortex maps optimized for coverage?

The elegant regularity of maps of variables such as ocular dominance, orientation, and spatial frequency in primary visual cortex has prompted many people to suggest that their structure could be explained by an optimization principle. Up to now, the standard way to test this hypothesis has been to generate artificial maps by optimizing a hypothesized objective function and then to compare these artificial maps with real maps using a variety of quantitative criteria. If the artificial maps are similar to the real maps, this provides some evidence that the real cortex may be optimizing a similar function to the one hypothesized. Recently, a more direct method has been proposed for testing whether real maps represent local optima of an objective function (Swindale, Shoham, Grinvald, Bonhoeffer, & Hilbener, 2000). In this approach, the value of the hypothesized function is calculated for a real map, and then the real map is perturbed in certain ways and the function recalculated. If each of these perturbations leads to a worsening of the function, it is tempting to conclude that the real map is quite likely to represent a local optimum of that function. In this article, we argue that such perturbation results provide only weak evidence in favor of the optimization hypothesis