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Papers by camilo neto

Revista Brasileira De Cirurgia Cardiovascular, 2000

Paulista P P -Miniesternotomia e mini-incisão: experiência inicial do Instituto Dante Pazzanese d... more Paulista P P -Miniesternotomia e mini-incisão: experiência inicial do Instituto Dante Pazzanese de Cardiologia. Rev Bras Cir Cardiovasc 2000; 15 (1): 39-43.

Annals of Thoracic Surgery, 2003

Background. This study is aimed at analyzing risk factors for fetal and maternal mortality in car... more Background. This study is aimed at analyzing risk factors for fetal and maternal mortality in cardiac surgery during pregnancy.

Cirurgia da endocardite em valva aórtica: opção para tratamento de abscesso aórtico

Arquivos Brasileiros De Cardiologia, 2008

FUNDAMENTO: A grande diversidade de apresentações anatômicas encontradas em pacientes com endocar... more FUNDAMENTO: A grande diversidade de apresentações anatômicas encontradas em pacientes com endocardite infecciosa, especialmente nos que desenvolvem abscessos do anel aórtico ou fistulas intracardíacas, tem sido um complicador para o tratamento cirúrgico dessa doença. Por esse motivo, os cirurgiões têm desenvolvido opções táticas para sua correção. A consciência geral de que a retirada do tecido infectado promove uma limpeza radical, o aparecimento de colas biológicas que facilitam o fechamento dos abscessos e o surgimento de novos substitutos valvares melhoraram o resultado do tratamento. OBJETIVO: Demonstrar mais uma opção no tratamento do abscesso aórtico, para casos selecionados, tubo valvulado em posição infra-coronariana. MÉTODOS: Empreendemos a técnica em três pacientes: em dois, empregamos tubo valvulado com prótese mecânica, e em um, com prótese biológica. Dois pacientes necessitaram procedimentos associados com troca da valva mitral em um deles e plástica da valva tricúspide no outro. Todos eram reoperações de próteses em posição aórtica. RESULTADOS: A evolução cirúrgica e pós-operatória imediata foi satisfatória com os três recebendo alta da Unidade de Terapia Intensiva para o quarto. Um dos pacientes evoluiu para óbito durante a internação em razão de co-morbidades graves que já apresentava no pré-operatório, relacionadas a varizes de esôfago e comprometimento hepático. Os outros dois apresentam boa evolução no pós-operatório tardio. CONCLUSÃO: Acreditamos que essa opção seja mais uma alternativa para o tratamento de abscessos com grande comprometimento de estruturas do anel aórtico e da continuidade mitro-aórtica.

Arquivos Brasileiros De Cardiologia, 2002

Methods -Fifty patients underwent surgical correction of the partial form of atrioventricular sep... more Methods -Fifty patients underwent surgical correction of the partial form of atrioventricular septal defect. Their mean age was 11.8 years and 62% of the patients were males. Preoperative echocardiography showed moderate and severe mitral insufficiency in 44% of the patients. The mitral valve cleft was sutured in 45 (90%) patients (group II -GII). Echocardiographies were performed in the early postoperative period, and 6 and 12 months after hospital discharge.

Revista Brasileira De Cirurgia Cardiovascular, 1999

Paulista P P -Evolução tardia de pacientes com prótese aórtica pequena (19 e 21 mm). Rev Bras Cir... more Paulista P P -Evolução tardia de pacientes com prótese aórtica pequena (19 e 21 mm). Rev Bras Cir Cardiovasc 1999; 14 (4): 279-84. Rev Bras Cir Cardiovasc 1999; 14(4): 279-84.

Transplante cardíaco ortotópico pela técnica bicaval

Revista Brasileira De Cirurgia Cardiovascular, 1997

... anastomose única das veias pulmonares, em conjunto, com o átrio esquerdo do coração a ser ...... more ... anastomose única das veias pulmonares, em conjunto, com o átrio esquerdo do coração a ser ... A função atrial após o transplante tem sido, também, objeto de investigação clínica e ... que a fração de enchimento atrial direito e esquerdo, definida com a diferença entre os volumes ...

Revista Brasileira De Cirurgia Cardiovascular, 2000

Paulista P P -Endocardite infecciosa: 12 anos de tratamento cirúrgico. Rev Bras Cir Cardiovasc 20... more Paulista P P -Endocardite infecciosa: 12 anos de tratamento cirúrgico. Rev Bras Cir Cardiovasc 2000; 15(4): 308-19. Rev Bras Cir Cardiovasc 2000; 15(4): 308-19. INTRODUÇÃO A endocardite é uma doença que vem sofrendo modificações desde sua descoberta, tanto na con-cepção diagnostica, como na detecção de seus agentes causadores, passando pelos métodos diagnósticos com a evolução dos ecocardiógrafos e terminando no tratamento clínico ou cirúrgico. Paulista P P -Endocardite infecciosa: 12 anos de tratamento cirúrgico. Rev Bras Cir Cardiovasc 2000; 15(4): 308-19. DESCRITORES: Doenças das valvas cardíacas, cirurgia. Implante de prótese de valva, mortalidade. Implante de prótese de valva, resultado de tratamento. Implante de prótese de valva, análise de sobrevivência. Endocardite, cirurgia. Endocardite, resultado de tratamento. Paulista P P -Endocardite infecciosa: 12 anos de tratamento cirúrgico. Rev Bras Cir Cardiovasc 2000; 15(4): 308-19. Paulista P P -Infective endocarditis: 12 years of surgical treatment. Rev Bras Cir Cardiovasc 2000; 15(4): 308-19.

American Journal of Cardiology, 1982

Inversion of the atrial flow in transposition of the great arteries is achieved in the following ... more Inversion of the atrial flow in transposition of the great arteries is achieved in the following way: the remaining atrial septum is detached from behind, leaving it as a flap between both AVvalves. The incision is continued into the coronary sinus and the Vena magna cordis to the base of the left atrial appendage along the mitral ring. The resulting flap from the split coronary sinus is sutured to the left atrial wail in front of the left side pulmonary veins, thus forming a septum dorsal to the caval veins, diverting the left pulmonary venous blood to the right side. The atrial septal

Background. This study is aimed at analyzing risk factors for fetal and maternal mortality in car... more Background. This study is aimed at analyzing risk factors for fetal and maternal mortality in cardiac surgery during pregnancy.

Generalized thermostatistics description of probability densities of turbulent temperature fluctuations

Computer Physics Communications, 2002

In this paper, we present evidence, based on data from the Large Scale Biosphere Atmosphere Exper... more In this paper, we present evidence, based on data from the Large Scale Biosphere Atmosphere Experiment in Amazonia (LBA), that the generalized thermostatistics provides a simple and accurate framework for modeling the statistical behavior of turbulent temperature fluctuations.

In this paper we describe two new computational operators, called complex entropic form (CEF) and... more In this paper we describe two new computational operators, called complex entropic form (CEF) and generalized complex entropic form (GEF), for pattern characterization of spatially extended systems. Besides of being a measure of regularity, both operators permit to quantify the degree of phase disorder associated with a given gradient field. An application of CEF and GEF to the analysis of the gradient pattern dynamics of a logistic Coupled Map Lattice is presented. Simulations using a Gaussian and random initial condition, provide interesting insights on the the system gradual transition from order/symmetry to disorder/randomness.

Journal of Geophysical Research, 2002

We analyzed the probability density function (PDF) of velocity and temperature differences in the... more We analyzed the probability density function (PDF) of velocity and temperature differences in the canopy sublayer of Amazonia based on Tsallis' generalized thermostatistics theory. We show that such a theory provides an accurate framework for modeling the statistical behavior of the inertial subrange above and below the canopy. For this, we compared the experimental PDFs with the theoretically predicted ones. The data were measured during the wet season of the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA), which was carried out during the months of January-March 1999 in the southwestern part of Amazonia region. Measurements were made simultaneously at different heights in a 60 m micrometeorological tower located in the Biological Reserve of Jaru (10°04'S, 61°56'W), Brazil. The fast response wind speed measurements, sampled at 60 Hz rate, were made using three-dimensional sonic anemometers at the heights of 66 m (above the canopy) and 21 m (below the canopy). The results showed good agreement between experimental data measured above the canopy forest and Tsallis' generalized thermostatistics theory. For below canopy data, the agreement between experimental and theoretical PDFs was fairly good, but some distortion was observed. This is probably due to some peculiar characteristics of turbulent momentum transfer process inside the forest crown. Discussion is presented to explain these results. Conclusions regarding the absence of "universal scaling" in the inertial subrange are also presented in the context of the entropic parameter of Tsallis' theory.

Journal of Geophysical Research, 2002

1] We analyzed the probability density function (PDF) of velocity and temperature differences in ... more 1] We analyzed the probability density function (PDF) of velocity and temperature differences in the canopy sublayer of Amazonia based on Tsallis' generalized thermostatistics theory. We show that such a theory provides an accurate framework for modeling the statistical behavior of the inertial subrange above and below the canopy. For this, we compared the experimental PDFs with the theoretically predicted ones. The data were measured during the wet season of the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA), which was carried out during the months of January-March 1999 in the southwestern part of Amazonia region. Measurements were made simultaneously at different heights in a 60 m micrometeorological tower located in the Biological Reserve of Jaru (10°04 0 S, 61°56 0 W), Brazil. The fast response wind speed measurements, sampled at 60 Hz rate, were made using three-dimensional sonic anemometers at the heights of 66 m (above the canopy) and 21 m (below the canopy). The results showed good agreement between experimental data measured above the canopy forest and Tsallis' generalized thermostatistics theory. For below canopy data, the agreement between experimental and theoretical PDFs was fairly good, but some distortion was observed. This is probably due to some peculiar characteristics of turbulent momentum transfer process inside the forest crown. Discussion is presented to explain these results. Conclusions regarding the absence of ''universal scaling'' in the inertial subrange are also presented in the context of the entropic parameter of Tsallis' theory. Analysis of fine-scale canopy turbulence within and above an Amazon forest using Tsallis' generalized thermostatistics,

Physica A-statistical Mechanics and Its Applications, 2000

In this paper we describe two new computational operators, called complex entropic form (CEF) and... more In this paper we describe two new computational operators, called complex entropic form (CEF) and generalized complex entropic form (GEF), for pattern characterization of spatially extended systems. Besides of being a measure of regularity, both operators permit to quantify the degree of phase disorder associated with a given gradient field. An application of CEF and GEF to the analysis of the gradient pattern dynamics of a logistic Coupled Map Lattice is presented. Simulations using a Gaussian and random initial condition, provide interesting insights on the the system gradual transition from order/symmetry to disorder/randomness.

Physica A-statistical Mechanics and Its Applications, 2001

In this paper, we present further evidence, based on new data from the Large Scale Biosphere Atmo... more In this paper, we present further evidence, based on new data from the Large Scale Biosphere Atmosphere Experiment in Amazonia (LBA), that the generalized thermostatistics provides a simple and accurate framework for modeling the statistical behavior of fully developed turbulence.

Nonlinear Analysis-theory Methods & Applications, 2001

Multifractal model for eddy diffusivity and counter-gradient term in atmospheric turbulence

Physica A-statistical Mechanics and Its Applications, 2001

A new approach for eddy diffusivity and counter-gradient term in atmospheric turbulent fluxes is ... more A new approach for eddy diffusivity and counter-gradient term in atmospheric turbulent fluxes is developed. This scheme is based on the Taylor statistical theory of turbulence and on a multifractal approach to the turbulent spectrum of energy. The non-extensive thermodynamics description is used to obtain a multifractal model.

Physica A-statistical Mechanics and Its Applications, 2000

In this paper, we present an algorithm based on the multi-wavelet transform and on the multitaper... more In this paper, we present an algorithm based on the multi-wavelet transform and on the multitaper spectral and polarization methods to estimate polarization parameters of a non-stationary geomagnetic pulsations signals. Through the ÿrst right-singular vector and the singular values, obtained from singular value decomposition (SVD) of the multiwavelet eigenspectra matrix M(f; t) of the three-component geomagnetic pulsations we determined the polarization parameters of the hydromagnetic waves in the time-frequency plane. It was used in the multiwavelet polarization analysis to estimate the polarization parameters of geomagnetic pulsations signals obtained from a large geomagnetic storm on March 24, 1991. The results showed that this method is a powerful tool to ÿnd events with high degree of polarization and allow to determine the polarization parameters continually in both time and frequency, giving an appropriate resolution to study pulsations that have narrow spectral band and short-lived components.

Journal of Geophysical Research, 2002

1] We analyzed the probability density function (PDF) of velocity and temperature differences in ... more 1] We analyzed the probability density function (PDF) of velocity and temperature differences in the canopy sublayer of Amazonia based on Tsallis' generalized thermostatistics theory. We show that such a theory provides an accurate framework for modeling the statistical behavior of the inertial subrange above and below the canopy. For this, we compared the experimental PDFs with the theoretically predicted ones. The data were measured during the wet season of the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA), which was carried out during the months of January-March 1999 in the southwestern part of Amazonia region. Measurements were made simultaneously at different heights in a 60 m micrometeorological tower located in the Biological Reserve of Jaru (10°04 0 S, 61°56 0 W), Brazil. The fast response wind speed measurements, sampled at 60 Hz rate, were made using three-dimensional sonic anemometers at the heights of 66 m (above the canopy) and 21 m (below the canopy). The results showed good agreement between experimental data measured above the canopy forest and Tsallis' generalized thermostatistics theory. For below canopy data, the agreement between experimental and theoretical PDFs was fairly good, but some distortion was observed. This is probably due to some peculiar characteristics of turbulent momentum transfer process inside the forest crown. Discussion is presented to explain these results. Conclusions regarding the absence of ''universal scaling'' in the inertial subrange are also presented in the context of the entropic parameter of Tsallis' theory. Analysis of fine-scale canopy turbulence within and above an Amazon forest using Tsallis' generalized thermostatistics,

Revista Brasileira De Cirurgia Cardiovascular, 2000

Paulista P P -Miniesternotomia e mini-incisão: experiência inicial do Instituto Dante Pazzanese d... more Paulista P P -Miniesternotomia e mini-incisão: experiência inicial do Instituto Dante Pazzanese de Cardiologia. Rev Bras Cir Cardiovasc 2000; 15 (1): 39-43.

Annals of Thoracic Surgery, 2003

Background. This study is aimed at analyzing risk factors for fetal and maternal mortality in car... more Background. This study is aimed at analyzing risk factors for fetal and maternal mortality in cardiac surgery during pregnancy.

Cirurgia da endocardite em valva aórtica: opção para tratamento de abscesso aórtico

Arquivos Brasileiros De Cardiologia, 2008

FUNDAMENTO: A grande diversidade de apresentações anatômicas encontradas em pacientes com endocar... more FUNDAMENTO: A grande diversidade de apresentações anatômicas encontradas em pacientes com endocardite infecciosa, especialmente nos que desenvolvem abscessos do anel aórtico ou fistulas intracardíacas, tem sido um complicador para o tratamento cirúrgico dessa doença. Por esse motivo, os cirurgiões têm desenvolvido opções táticas para sua correção. A consciência geral de que a retirada do tecido infectado promove uma limpeza radical, o aparecimento de colas biológicas que facilitam o fechamento dos abscessos e o surgimento de novos substitutos valvares melhoraram o resultado do tratamento. OBJETIVO: Demonstrar mais uma opção no tratamento do abscesso aórtico, para casos selecionados, tubo valvulado em posição infra-coronariana. MÉTODOS: Empreendemos a técnica em três pacientes: em dois, empregamos tubo valvulado com prótese mecânica, e em um, com prótese biológica. Dois pacientes necessitaram procedimentos associados com troca da valva mitral em um deles e plástica da valva tricúspide no outro. Todos eram reoperações de próteses em posição aórtica. RESULTADOS: A evolução cirúrgica e pós-operatória imediata foi satisfatória com os três recebendo alta da Unidade de Terapia Intensiva para o quarto. Um dos pacientes evoluiu para óbito durante a internação em razão de co-morbidades graves que já apresentava no pré-operatório, relacionadas a varizes de esôfago e comprometimento hepático. Os outros dois apresentam boa evolução no pós-operatório tardio. CONCLUSÃO: Acreditamos que essa opção seja mais uma alternativa para o tratamento de abscessos com grande comprometimento de estruturas do anel aórtico e da continuidade mitro-aórtica.

Arquivos Brasileiros De Cardiologia, 2002

Methods -Fifty patients underwent surgical correction of the partial form of atrioventricular sep... more Methods -Fifty patients underwent surgical correction of the partial form of atrioventricular septal defect. Their mean age was 11.8 years and 62% of the patients were males. Preoperative echocardiography showed moderate and severe mitral insufficiency in 44% of the patients. The mitral valve cleft was sutured in 45 (90%) patients (group II -GII). Echocardiographies were performed in the early postoperative period, and 6 and 12 months after hospital discharge.

Revista Brasileira De Cirurgia Cardiovascular, 1999

Paulista P P -Evolução tardia de pacientes com prótese aórtica pequena (19 e 21 mm). Rev Bras Cir... more Paulista P P -Evolução tardia de pacientes com prótese aórtica pequena (19 e 21 mm). Rev Bras Cir Cardiovasc 1999; 14 (4): 279-84. Rev Bras Cir Cardiovasc 1999; 14(4): 279-84.

Transplante cardíaco ortotópico pela técnica bicaval

Revista Brasileira De Cirurgia Cardiovascular, 1997

... anastomose única das veias pulmonares, em conjunto, com o átrio esquerdo do coração a ser ...... more ... anastomose única das veias pulmonares, em conjunto, com o átrio esquerdo do coração a ser ... A função atrial após o transplante tem sido, também, objeto de investigação clínica e ... que a fração de enchimento atrial direito e esquerdo, definida com a diferença entre os volumes ...

Revista Brasileira De Cirurgia Cardiovascular, 2000

Paulista P P -Endocardite infecciosa: 12 anos de tratamento cirúrgico. Rev Bras Cir Cardiovasc 20... more Paulista P P -Endocardite infecciosa: 12 anos de tratamento cirúrgico. Rev Bras Cir Cardiovasc 2000; 15(4): 308-19. Rev Bras Cir Cardiovasc 2000; 15(4): 308-19. INTRODUÇÃO A endocardite é uma doença que vem sofrendo modificações desde sua descoberta, tanto na con-cepção diagnostica, como na detecção de seus agentes causadores, passando pelos métodos diagnósticos com a evolução dos ecocardiógrafos e terminando no tratamento clínico ou cirúrgico. Paulista P P -Endocardite infecciosa: 12 anos de tratamento cirúrgico. Rev Bras Cir Cardiovasc 2000; 15(4): 308-19. DESCRITORES: Doenças das valvas cardíacas, cirurgia. Implante de prótese de valva, mortalidade. Implante de prótese de valva, resultado de tratamento. Implante de prótese de valva, análise de sobrevivência. Endocardite, cirurgia. Endocardite, resultado de tratamento. Paulista P P -Endocardite infecciosa: 12 anos de tratamento cirúrgico. Rev Bras Cir Cardiovasc 2000; 15(4): 308-19. Paulista P P -Infective endocarditis: 12 years of surgical treatment. Rev Bras Cir Cardiovasc 2000; 15(4): 308-19.

American Journal of Cardiology, 1982

Inversion of the atrial flow in transposition of the great arteries is achieved in the following ... more Inversion of the atrial flow in transposition of the great arteries is achieved in the following way: the remaining atrial septum is detached from behind, leaving it as a flap between both AVvalves. The incision is continued into the coronary sinus and the Vena magna cordis to the base of the left atrial appendage along the mitral ring. The resulting flap from the split coronary sinus is sutured to the left atrial wail in front of the left side pulmonary veins, thus forming a septum dorsal to the caval veins, diverting the left pulmonary venous blood to the right side. The atrial septal

Background. This study is aimed at analyzing risk factors for fetal and maternal mortality in car... more Background. This study is aimed at analyzing risk factors for fetal and maternal mortality in cardiac surgery during pregnancy.

Generalized thermostatistics description of probability densities of turbulent temperature fluctuations

Computer Physics Communications, 2002

In this paper, we present evidence, based on data from the Large Scale Biosphere Atmosphere Exper... more In this paper, we present evidence, based on data from the Large Scale Biosphere Atmosphere Experiment in Amazonia (LBA), that the generalized thermostatistics provides a simple and accurate framework for modeling the statistical behavior of turbulent temperature fluctuations.

In this paper we describe two new computational operators, called complex entropic form (CEF) and... more In this paper we describe two new computational operators, called complex entropic form (CEF) and generalized complex entropic form (GEF), for pattern characterization of spatially extended systems. Besides of being a measure of regularity, both operators permit to quantify the degree of phase disorder associated with a given gradient field. An application of CEF and GEF to the analysis of the gradient pattern dynamics of a logistic Coupled Map Lattice is presented. Simulations using a Gaussian and random initial condition, provide interesting insights on the the system gradual transition from order/symmetry to disorder/randomness.

Journal of Geophysical Research, 2002

We analyzed the probability density function (PDF) of velocity and temperature differences in the... more We analyzed the probability density function (PDF) of velocity and temperature differences in the canopy sublayer of Amazonia based on Tsallis' generalized thermostatistics theory. We show that such a theory provides an accurate framework for modeling the statistical behavior of the inertial subrange above and below the canopy. For this, we compared the experimental PDFs with the theoretically predicted ones. The data were measured during the wet season of the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA), which was carried out during the months of January-March 1999 in the southwestern part of Amazonia region. Measurements were made simultaneously at different heights in a 60 m micrometeorological tower located in the Biological Reserve of Jaru (10°04'S, 61°56'W), Brazil. The fast response wind speed measurements, sampled at 60 Hz rate, were made using three-dimensional sonic anemometers at the heights of 66 m (above the canopy) and 21 m (below the canopy). The results showed good agreement between experimental data measured above the canopy forest and Tsallis' generalized thermostatistics theory. For below canopy data, the agreement between experimental and theoretical PDFs was fairly good, but some distortion was observed. This is probably due to some peculiar characteristics of turbulent momentum transfer process inside the forest crown. Discussion is presented to explain these results. Conclusions regarding the absence of "universal scaling" in the inertial subrange are also presented in the context of the entropic parameter of Tsallis' theory.

Journal of Geophysical Research, 2002

1] We analyzed the probability density function (PDF) of velocity and temperature differences in ... more 1] We analyzed the probability density function (PDF) of velocity and temperature differences in the canopy sublayer of Amazonia based on Tsallis' generalized thermostatistics theory. We show that such a theory provides an accurate framework for modeling the statistical behavior of the inertial subrange above and below the canopy. For this, we compared the experimental PDFs with the theoretically predicted ones. The data were measured during the wet season of the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA), which was carried out during the months of January-March 1999 in the southwestern part of Amazonia region. Measurements were made simultaneously at different heights in a 60 m micrometeorological tower located in the Biological Reserve of Jaru (10°04 0 S, 61°56 0 W), Brazil. The fast response wind speed measurements, sampled at 60 Hz rate, were made using three-dimensional sonic anemometers at the heights of 66 m (above the canopy) and 21 m (below the canopy). The results showed good agreement between experimental data measured above the canopy forest and Tsallis' generalized thermostatistics theory. For below canopy data, the agreement between experimental and theoretical PDFs was fairly good, but some distortion was observed. This is probably due to some peculiar characteristics of turbulent momentum transfer process inside the forest crown. Discussion is presented to explain these results. Conclusions regarding the absence of ''universal scaling'' in the inertial subrange are also presented in the context of the entropic parameter of Tsallis' theory. Analysis of fine-scale canopy turbulence within and above an Amazon forest using Tsallis' generalized thermostatistics,

Physica A-statistical Mechanics and Its Applications, 2000

In this paper we describe two new computational operators, called complex entropic form (CEF) and... more In this paper we describe two new computational operators, called complex entropic form (CEF) and generalized complex entropic form (GEF), for pattern characterization of spatially extended systems. Besides of being a measure of regularity, both operators permit to quantify the degree of phase disorder associated with a given gradient field. An application of CEF and GEF to the analysis of the gradient pattern dynamics of a logistic Coupled Map Lattice is presented. Simulations using a Gaussian and random initial condition, provide interesting insights on the the system gradual transition from order/symmetry to disorder/randomness.

Physica A-statistical Mechanics and Its Applications, 2001

In this paper, we present further evidence, based on new data from the Large Scale Biosphere Atmo... more In this paper, we present further evidence, based on new data from the Large Scale Biosphere Atmosphere Experiment in Amazonia (LBA), that the generalized thermostatistics provides a simple and accurate framework for modeling the statistical behavior of fully developed turbulence.

Nonlinear Analysis-theory Methods & Applications, 2001

Multifractal model for eddy diffusivity and counter-gradient term in atmospheric turbulence

Physica A-statistical Mechanics and Its Applications, 2001

A new approach for eddy diffusivity and counter-gradient term in atmospheric turbulent fluxes is ... more A new approach for eddy diffusivity and counter-gradient term in atmospheric turbulent fluxes is developed. This scheme is based on the Taylor statistical theory of turbulence and on a multifractal approach to the turbulent spectrum of energy. The non-extensive thermodynamics description is used to obtain a multifractal model.

Physica A-statistical Mechanics and Its Applications, 2000

In this paper, we present an algorithm based on the multi-wavelet transform and on the multitaper... more In this paper, we present an algorithm based on the multi-wavelet transform and on the multitaper spectral and polarization methods to estimate polarization parameters of a non-stationary geomagnetic pulsations signals. Through the ÿrst right-singular vector and the singular values, obtained from singular value decomposition (SVD) of the multiwavelet eigenspectra matrix M(f; t) of the three-component geomagnetic pulsations we determined the polarization parameters of the hydromagnetic waves in the time-frequency plane. It was used in the multiwavelet polarization analysis to estimate the polarization parameters of geomagnetic pulsations signals obtained from a large geomagnetic storm on March 24, 1991. The results showed that this method is a powerful tool to ÿnd events with high degree of polarization and allow to determine the polarization parameters continually in both time and frequency, giving an appropriate resolution to study pulsations that have narrow spectral band and short-lived components.

Journal of Geophysical Research, 2002

1] We analyzed the probability density function (PDF) of velocity and temperature differences in ... more 1] We analyzed the probability density function (PDF) of velocity and temperature differences in the canopy sublayer of Amazonia based on Tsallis' generalized thermostatistics theory. We show that such a theory provides an accurate framework for modeling the statistical behavior of the inertial subrange above and below the canopy. For this, we compared the experimental PDFs with the theoretically predicted ones. The data were measured during the wet season of the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA), which was carried out during the months of January-March 1999 in the southwestern part of Amazonia region. Measurements were made simultaneously at different heights in a 60 m micrometeorological tower located in the Biological Reserve of Jaru (10°04 0 S, 61°56 0 W), Brazil. The fast response wind speed measurements, sampled at 60 Hz rate, were made using three-dimensional sonic anemometers at the heights of 66 m (above the canopy) and 21 m (below the canopy). The results showed good agreement between experimental data measured above the canopy forest and Tsallis' generalized thermostatistics theory. For below canopy data, the agreement between experimental and theoretical PDFs was fairly good, but some distortion was observed. This is probably due to some peculiar characteristics of turbulent momentum transfer process inside the forest crown. Discussion is presented to explain these results. Conclusions regarding the absence of ''universal scaling'' in the inertial subrange are also presented in the context of the entropic parameter of Tsallis' theory. Analysis of fine-scale canopy turbulence within and above an Amazon forest using Tsallis' generalized thermostatistics,