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Research paper thumbnail of Os sentimentos explicam as escolhas dos eleitores?

Revista Debates, 2016

A hipótese central deste artigo é que os eleitores têm sentimentos para com candidatos e estes mo... more A hipótese central deste artigo é que os eleitores têm sentimentos para com candidatos e estes motivam suas escolhas. Este artigo tem o objetivo de comprovar a hipótese apresentada. Saudades, entusiasmo e medo são os sentimentos dos sufragistas abordados, os quais foram extraídos de diversas pesquisas de opinião realizadas no estado de Pernambuco durante a eleição presidencial de 2014. Para a comprovação da hipótese sugerida, utiliza-se a estatística descritiva e modelos estatísticos. Estudos sobre os sentimentos dos eleitores são escassos na produção científica brasileira. Este artigo procura preencher tal vazio e incentivar novos trabalhos sobre os sentimentos dos eleitores.

Research paper thumbnail of Sequência didática para o ensino de astronomia por investigação utilizando o Stellarium

Cadernos de Astronomia, 2020

O objetivo desse artigo é apresentar três propostas de sequências didáticas, cuja temática é a As... more O objetivo desse artigo é apresentar três propostas de sequências didáticas, cuja temática é a Astronomia, buscando um alinhamento com as habilidades trazida pela BNCC e utilizando metodologia por investigação. Como resultado final da aplicação destas práticas os alunos conseguirão: (1) determinar a massa de Júpiter, calculada a partir do eclipse de Io; (2) reconhecer as crateras e mares lunares; e (3) construir um diagrama H-R para as estrelas mais próximas.

Research paper thumbnail of Avaliação do conhecimento geral de médicos emergencistas de hospitais de Salvador - Bahia sobre o atendimento de vítimas com parada cardiorrespiratória

Arquivos Brasileiros de Cardiologia, 2006

Objectives To characterize an experimental model of pulmonary embolism by studying hemodynamics, ... more Objectives To characterize an experimental model of pulmonary embolism by studying hemodynamics, lung mechanics and histopathologic derangements caused by pulmonary microembolism in pigs. To identify lung alterations after embolism that may be similar to those evidenced in pulmonary inflammatory conditions. Materials and methods Ten Large White pigs (weight 35-42 kg) were instrumented with arterial and pulmonary catheters, and pulmonary embolism was induced in five pigs by injection of polystyrene microspheres (diameter ~300 µM), in order to obtain a pulmonary mean arterial pressure of twice the baseline value. Five other animals injected with saline served as controls. Hemodynamic and respiratory data were collected and pressure x volume curves of the respiratory system were performed by a quasi-static low flow method. Animals were followed for 12 hours, and after death lung fragments were dissected and sent to pathology. Results Pulmonary embolism induced a significant reduction in stroke volume (71 ± 18 ml/min/bpm pre vs 36 ± 9 ml/min/bpm post, P < 0.05), an increase in pulmonary mean arterial pressure (27 ± 4 mmHg pre vs 39 ± 6 mmHg post, P < 0.05) and pulmonary vascular resistance (193 ± 122 mmHg/l/min pre vs 451 ± 149 mmHg/l/min post, P < 0.05). Respiratory dysfunction was evidenced by significant reductions in the PaO 2 /FiO 2 ratio (480 ± 50 pre vs 159 ± 55 post, P < 0.05), the dynamic lung compliance (27 ± 6 ml/cmH 2 O pre vs 19 ± 5 ml/cmH 2 O post, P < 0.05), the increase in dead space ventilation (20 ± 4 pre vs 47 ± 20 post, P < 0.05) and, the shift of pressure x volume curves to the right, with reduction in pulmonary hysteresis. Pathology depicted inflammatory neutrophil infiltrates, alveolar edema, collapse and hemorrhagic infarctions. Conclusion This model of embolism is associated with cardiovascular dysfunction, as well as respiratory injury characterized by a decrease in oxygenation, lung compliance and hysteresis. Pathology findings were similar to those verified in inflammatory pulmonary injury conditions. This model may be useful to study pathophysiology, as well as pharmacologic and ventilatory interventions useful to treat pulmonary embolism. P6 Hemodynamic and metabolic features of a porcine systemic low flow state model

Research paper thumbnail of An efficient gray-level thresholding algorithm for historic document images

Journal of Cultural Heritage, 2008

For further processing of document images, the ink pixels must be separated from the background p... more For further processing of document images, the ink pixels must be separated from the background pixels. This paper presents a new method for thresholding images of historical documents. The main objective is to create monochromatic images with high quality at low processing ...

Research paper thumbnail of Os sentimentos explicam as escolhas dos eleitores?

Revista Debates, 2016

A hipótese central deste artigo é que os eleitores têm sentimentos para com candidatos e estes mo... more A hipótese central deste artigo é que os eleitores têm sentimentos para com candidatos e estes motivam suas escolhas. Este artigo tem o objetivo de comprovar a hipótese apresentada. Saudades, entusiasmo e medo são os sentimentos dos sufragistas abordados, os quais foram extraídos de diversas pesquisas de opinião realizadas no estado de Pernambuco durante a eleição presidencial de 2014. Para a comprovação da hipótese sugerida, utiliza-se a estatística descritiva e modelos estatísticos. Estudos sobre os sentimentos dos eleitores são escassos na produção científica brasileira. Este artigo procura preencher tal vazio e incentivar novos trabalhos sobre os sentimentos dos eleitores.

Research paper thumbnail of Sequência didática para o ensino de astronomia por investigação utilizando o Stellarium

Cadernos de Astronomia, 2020

O objetivo desse artigo é apresentar três propostas de sequências didáticas, cuja temática é a As... more O objetivo desse artigo é apresentar três propostas de sequências didáticas, cuja temática é a Astronomia, buscando um alinhamento com as habilidades trazida pela BNCC e utilizando metodologia por investigação. Como resultado final da aplicação destas práticas os alunos conseguirão: (1) determinar a massa de Júpiter, calculada a partir do eclipse de Io; (2) reconhecer as crateras e mares lunares; e (3) construir um diagrama H-R para as estrelas mais próximas.

Research paper thumbnail of Avaliação do conhecimento geral de médicos emergencistas de hospitais de Salvador - Bahia sobre o atendimento de vítimas com parada cardiorrespiratória

Arquivos Brasileiros de Cardiologia, 2006

Objectives To characterize an experimental model of pulmonary embolism by studying hemodynamics, ... more Objectives To characterize an experimental model of pulmonary embolism by studying hemodynamics, lung mechanics and histopathologic derangements caused by pulmonary microembolism in pigs. To identify lung alterations after embolism that may be similar to those evidenced in pulmonary inflammatory conditions. Materials and methods Ten Large White pigs (weight 35-42 kg) were instrumented with arterial and pulmonary catheters, and pulmonary embolism was induced in five pigs by injection of polystyrene microspheres (diameter ~300 µM), in order to obtain a pulmonary mean arterial pressure of twice the baseline value. Five other animals injected with saline served as controls. Hemodynamic and respiratory data were collected and pressure x volume curves of the respiratory system were performed by a quasi-static low flow method. Animals were followed for 12 hours, and after death lung fragments were dissected and sent to pathology. Results Pulmonary embolism induced a significant reduction in stroke volume (71 ± 18 ml/min/bpm pre vs 36 ± 9 ml/min/bpm post, P < 0.05), an increase in pulmonary mean arterial pressure (27 ± 4 mmHg pre vs 39 ± 6 mmHg post, P < 0.05) and pulmonary vascular resistance (193 ± 122 mmHg/l/min pre vs 451 ± 149 mmHg/l/min post, P < 0.05). Respiratory dysfunction was evidenced by significant reductions in the PaO 2 /FiO 2 ratio (480 ± 50 pre vs 159 ± 55 post, P < 0.05), the dynamic lung compliance (27 ± 6 ml/cmH 2 O pre vs 19 ± 5 ml/cmH 2 O post, P < 0.05), the increase in dead space ventilation (20 ± 4 pre vs 47 ± 20 post, P < 0.05) and, the shift of pressure x volume curves to the right, with reduction in pulmonary hysteresis. Pathology depicted inflammatory neutrophil infiltrates, alveolar edema, collapse and hemorrhagic infarctions. Conclusion This model of embolism is associated with cardiovascular dysfunction, as well as respiratory injury characterized by a decrease in oxygenation, lung compliance and hysteresis. Pathology findings were similar to those verified in inflammatory pulmonary injury conditions. This model may be useful to study pathophysiology, as well as pharmacologic and ventilatory interventions useful to treat pulmonary embolism. P6 Hemodynamic and metabolic features of a porcine systemic low flow state model

Research paper thumbnail of An efficient gray-level thresholding algorithm for historic document images

Journal of Cultural Heritage, 2008

For further processing of document images, the ink pixels must be separated from the background p... more For further processing of document images, the ink pixels must be separated from the background pixels. This paper presents a new method for thresholding images of historical documents. The main objective is to create monochromatic images with high quality at low processing ...