6,447 research outputs found
A study of the dynamics of droughts in Northern Brazil: Observations, theory, and numerical experiments with a global atmospheric circulation model
The monthly mean sea surface temperature anomalies over tropical Altantic and rainfall anomalies over two selected stations for 25 years (1948-1972) were examined. It is found that the most severe drought events are associated with the simultaneous occurrence of warm sea surface temperature anomalies over north and cold sea surface temperature anomalies over south tropical Atlantic. Simultaneous occurrences of warm sea surface temperature anomaly at 15 deg N, 45 deg W and cold sea surface temperature anomaly at 15 deg S, 5 deg W were always associated with negative anomalies of rainfall, and vice versa. A simple primitive equation model is used to calculate the frictionally controlled and thermally driven circulation due to a prescribed heating function in a resting atmosphere
Unitary transformation approach for the trapped ion dynamics
We present a way of treating the problem of the interaction of a single
trapped ion with laser beams based on successive aplications of unitary
transformations onto the Hamiltonian. This allows the diagonalization of the
Hamiltonian, by means of recursive relations, without performing the Lamb-Dicke
approximation.Comment: 8 page
Finite-dimensional representations of twisted hyper loop algebras
We investigate the category of finite-dimensional representations of twisted
hyper loop algebras, i.e., the hyperalgebras associated to twisted loop
algebras over finite-dimensional simple Lie algebras. The main results are the
classification of the irreducible modules, the definition of the universal
highest-weight modules, called the Weyl modules, and, under a certain mild
restriction on the characteristic of the ground field, a proof that the simple
modules and the Weyl modules for the twisted hyper loop algebras are isomorphic
to appropriate simple and Weyl modules for the non-twisted hyper loop algebras,
respectively, via restriction of the action
Structural and electron paramagnetic resonance (EPR) studies of mononuclear molybdenum enzymes from sulfate-reducing bacteria
Acc. Chem. Res., 2006, 39 (10), pp 788–796
DOI: 10.1021/ar050104kMolybdenum and tungsten are found in biological systems in a mononuclear form in the active site of a diverse group of enzymes that generally catalyze oxygen-atom-transfer reactions. The metal atom (Mo or W) is coordinated to one or two pyranopterin molecules and to a variable number of ligands such as oxygen (oxo, hydroxo, water, serine, aspartic acid), sulfur (cysteines), and selenium (selenocysteines) atoms. In addition, these proteins contain redox cofactors such as iron-sulfur clusters and heme groups. All of these metal cofactors are along an electron-transfer pathway that mediates the electron exchange between substrate and an external electron acceptor (for oxidative reactions) or donor (for reductive reactions). We describe in this Account a combination of structural and electronic paramagnetic resonance studies that were used to reveal distinct aspects of these enzymes
Aspectos climáticos da captação de água de chuva no Estado de Pernambuco.
Captação de água de chuva tem sido uma técnica popular em muitas partes do mundo, especialmente em regiões áridas e semi-áridas (que são aproximadamente 30% da superfície da terra). A captação de água de chuva é especialmente usada em áreas semi-áridas, onde a precipitação ocorre somente durante em alguns meses e em diferentes locais, como o semi-árido do Estado de Pernambuco, Brasil. O governo brasileiro está construindo 1 milão de cisternas para fornecer água de beber para 1 milhão de famílias do Semi-Árido brasileiro. Em Pernambuco serão construidas 22% do total de cisternas. A variabilidade da precipitação no Estado é decisiva para determinar a área de captação ideal para o abastecimento das cisternas nas diferentes regiões do estado. Esse estudo usou dados de precipitação anual para o estado de Pernambuco. Foi estimada a ocorrência de probabilidade de chuva usando a Distribuição Normal de Probabilidade dos quantis. Os resultados mostraram que em anos normais, nas áreas mais secas do estado, a precipitação média foi 400 mm. Este valor deve ser considerado para escolha do tamanho da cisterna e da área de captação para diferentes regiões de estado. A cisterna construída pelo governo tem capacidade para armazenar 16m³, para isso, é necessária uma área de captação de 60m² para garantir a eficiência e o abastecimento de água nas regiões mais secas de Pernambuco, com garantia em 80% dos anos
Detecting hydroclimatic changes using spatio-temporal analysis in the sub-medium São Francisco-PE basin, Brazil.
The São Francisco river basin is the third largest drainage basin of Brazil and the only one entirely within its frontiers
Multi-q Pattern Classification of Polarization Curves
Several experimental measurements are expressed in the form of
one-dimensional profiles, for which there is a scarcity of methodologies able
to classify the pertinence of a given result to a specific group. The
polarization curves that evaluate the corrosion kinetics of electrodes in
corrosive media are an application where the behavior is chiefly analyzed from
profiles. Polarization curves are indeed a classic method to determine the
global kinetics of metallic electrodes, but the strong nonlinearity from
different metals and alloys can overlap and the discrimination becomes a
challenging problem. Moreover, even finding a typical curve from replicated
tests requires subjective judgement. In this paper we used the so-called
multi-q approach based on the Tsallis statistics in a classification engine to
separate multiple polarization curve profiles of two stainless steels. We
collected 48 experimental polarization curves in aqueous chloride medium of two
stainless steel types, with different resistance against localized corrosion.
Multi-q pattern analysis was then carried out on a wide potential range, from
cathodic up to anodic regions. An excellent classification rate was obtained,
at a success rate of 90%, 80%, and 83% for low (cathodic), high (anodic), and
both potential ranges, respectively, using only 2% of the original profile
data. These results show the potential of the proposed approach towards
efficient, robust, systematic and automatic classification of highly non-linear
profile curves.Comment: 12 pages, 7 figure
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