Papers by Alexandre Carvalho
Journal of Coastal Research, 2017
Claudino-Sales, V.; Wang, P., and Carvalho, A.M., 0000. Interactions between various headlands, b... more Claudino-Sales, V.; Wang, P., and Carvalho, A.M., 0000. Interactions between various headlands, beaches, and dunes along the coast of Ceará State, Northeast Brazil.
Uso do GPR no estudo da estruturação interna de depósitos de eolianitos na região costeira de Uruoca - CE
A geophysical survey had been carried in the coastal region of Uruoca, NW Ceará State, to improve... more A geophysical survey had been carried in the coastal region of Uruoca, NW Ceará State, to improve outline the mechanism of aeolian morphogenesis through the analysis of the internal architecture of aeolianites deposits. This study is based on seismostratigraphic interpretation of sections GPR, as well as geologic mapping and remote sensing data. As preliminary results, it is evidenced excellent electromagnetic
Using Invasive and Non-Invasive Methods to Determine the Origin, Evolution and Classification of Coastal Aeolian Morphologies
Using Invasive and Non-Invasive Methods to Determine the Origin, Evolution and Classification of Coastal Aeolian Morphologies
Mercator, 2016
Este trabalho avalia a importância do transporte eólico para o comportamento morfogenético de um ... more Este trabalho avalia a importância do transporte eólico para o comportamento morfogenético de um trecho de 20Km da costa cearense entre a desembocadura do Rio Ceará e a Praia do Cumbuco. Consistiu na comparação entre o volume de areia envolvido na migração da linha da costa entre 1974 e 2001 e o potencial de formação de dunas, que é baseado na relação entre o ângulo formado entre a posição da linha de costa e a direção dominante do transporte eólico. O volume de material resultante da migração da linha de costa foi calculado multiplicando-se a área acrescida ou retirada pela soma da altura da berma ativa e a profundidade de fechamento. O potencial de formação de dunas, calculado para cada segmento estudado, demonstrou: (1) guardar uma excelente correlação com os volumes medidos para a migração da linha de costa; e (2) que a maioria dos segmentos têm sido submetidos a um potencial déficit sedimentar provocado pelo vento, salvo alguns poucos trechos onde há uma tendência de realimentação da praia pelo transporte eólico, através de um processo de 'headland bypass dune'. Os resultados mostraram que a atividade eólica pode ser fundamental para o equilíbrio da linha de costa, reforçando, desta forma, a idéia de que os trabalhos envolvendo a dinâmica costeira necessitam do estudo do transporte eólico para que possam representar adequadamente a dinâmica costeira da região estudada.
Brazilian Journal of Cardiovascular Surgery
Objective: To evaluate the sequential changes of hemodynamic and metabolic parameters in patients... more Objective: To evaluate the sequential changes of hemodynamic and metabolic parameters in patients who underwent aorta notouch off-pump coronary artery bypass surgery (OPCAB). Methods: Prospective study involving twenty-seven consecutive patients who underwent aorta no-touch OPCAB. The FloTrac/PreSep/Vigileo™ system (Edwards Lifesciences) was used to continuously record heart rate (HR), mean arterial blood pressure (MABP), central venous pressure (CVP), continuous cardiac index (FCI), stroke volume (SV), stroke volume variation (SVV), and central venous oxygen saturation (ScvO 2). The parameters were assessed 5 min before, during and 5 min after each anastomosis (left anterior descending [LAD], posterior descending [PD], obtuse marginal [OM] and diagonal [Dg]). Postoperative lactate was also evaluated. Results: There was no significant change in HR and MABP for all anastomoses, except for MABP during PD grafting (-10.1±2.7 mmHg, P=0.03). There was a significant decrease in ScvO 2 only during PD and OM anastomoses (-9.4±0.4, P=0.03;-4.4±0.4, P=0.02; respectively). CVP drop after PD manipulation was strongly associated with a higher lactate during the first hours after surgery (r=-0.82; P=0.001). These hemodynamic changes were transient and entirely recovered after the heart was returned to its anatomical position. No significant differences were observed in FCI, SVV, or the systemic vascular resistance index (SVRI) during all anastomoses, except for a drop in SVRI during PD grafting (-8.03±2.3, P=0.007). SV tended to decrease during the procedure in all territories, but with statistically significant drop only in PD and OM grafting (-10.4±1.2, P=0.02;-13.6±5.1, P=0.007; respectively). Conclusion: Heart displacement for performing aorta notouch OPCAB is well tolerated, with transient and endurable hemodynamic variations.
Eolianites of Flecheiras/Mundaú, Northwestern Coast of Ceará State, Brazil
sigep.cprm.gov.br
The eolianites, distributed along the northwestern part of Ceará State coast, are formed by arena... more The eolianites, distributed along the northwestern part of Ceará State coast, are formed by arenaceous rock deposits of quartz-bioclastic composition, cemented by calcium carbonate. This unit establishes an unique record of aeolian activity with peculiar features, rare on the ...
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Papers by Alexandre Carvalho