Molecular phylogenetics and evolution, Oct 21, 2017
The description of cryptic gecko species worldwide has revealed both that many putative species a... more The description of cryptic gecko species worldwide has revealed both that many putative species are, in fact, conformed by a complex of morphologically conserved species that are genetically distinct and highly divergent, and that gecko species diversity could be underestimated. The taxonomy and species delimitation of geckos belonging to the genus Phyllodactylus is still controversial, 16 of which are distributed in Mexico and 13 are endemic. Although the large morphological variation shown by the Phyllodactylus species from Mexico has been amply documented, little is known about their genetic diversity and evolutionary relationships, and much less regarding cryptic speciation. Here, we included the most comprehensive sampling of populations and species of the Phyllodactylus lanei complex distributed in Mexico, and applied an analytical approach that included probabilistic phylogenetic analyses, jointly with species delimitation methods and Bayesian putative species validation anal...
The properties of vortex clusters in rough-walled turbulent channels are analysed using direct nu... more The properties of vortex clusters in rough-walled turbulent channels are analysed using direct numerical simulations at Retau 600, in which roughness is simulated by distributions of velocity disturbances at the walls. The results are compared with data coming from smooth channels (del 'Alamo et al 2006 JFM 561). As in the smooth case, the present clusters separate into wall-detached objects and wall-attached ones. The detached clusters from rough and smooth walls are similar, consistent with their definition. Also expected, the attached clusters inside the roughness sublayer are quite different to those in the near-wall region over smooth walls. However, the attached clusters that reach above the buffer region are quite independent of the nature of the wall. The same result is obtained for the average velocity field conditioned to these tall attached clusters. This suggests that the dynamics of the logarithmic and outer regions depends only on the mean velocity gradient, even ...
The vortex clusters in the turbulent outer region of rough- and smooth-walled channels, and their... more The vortex clusters in the turbulent outer region of rough- and smooth-walled channels, and their associated velocity structures, are compared using data from numerical experiments at friction Reynolds numbers Reτ ≤ 674. The results indicate that the roughness of the wall does not affect their properties, particularly the existence of wall-detached and wall-attached populations, and the self-similar size distribution of the latter. The average flow field conditioned to the attached clusters reveals similar conical structures of low streamwise velocity for the rough- and smooth-walled cases, which eventually grow into the global modes previously identified from spectral analysis. We conclude that the vortex clusters of the turbulent outer region either originate away from the wall, or quickly forget their origin, in agreement with Townsend's similarity hypothesis.
Importance Most of the global morbidity and mortality in chronic obstructive pulmonary disease (C... more Importance Most of the global morbidity and mortality in chronic obstructive pulmonary disease (COPD) occurs in low- and middle-income countries (LMICs), with significant economic effects. Objective To assess the discriminative accuracy of 3 instruments using questionnaires and peak expiratory flow (PEF) to screen for COPD in 3 LMIC settings. Design, Setting, and Participants A cross-sectional analysis of discriminative accuracy, conducted between January 2018 and March 2020 in semiurban Bhaktapur, Nepal; urban Lima, Peru; and rural Nakaseke, Uganda, using a random age- and sex-stratified sample of the population 40 years or older. Exposures Three screening tools, the COPD Assessment in Primary Care to Identify Undiagnosed Respiratory Disease and Exacerbation Risk (CAPTURE; range, 0-6; high risk indicated by a score of 5 or more or score 2-5 with low PEF [<250 L/min for females and <350 L/min for males]), the COPD in LMICs Assessment questionnaire (COLA-6; range, 0-5; high ris...
We report direct numerical simulations of a pair of wings in horizontal tandem configuration, to ... more We report direct numerical simulations of a pair of wings in horizontal tandem configuration, to analyze the effect of their aspect ratio on the flow and the aerodynamic performance of the system. The wings are immersed in a uniform free-stream at Reynolds number Re = 1000, and they undergo heaving and pitching oscillation with Strouhal number St = 0.7. The aspect ratios of forewing and hindwing vary between 2 and 4. The aerodynamic performance of the system is dictated by the interaction between the trailing edge vortex (TEV) shed by the forewing and the induced leading edge vortex formed on the hindwing. The aerodynamic performance of the forewing is similar to that of an isolated wing irrespective of the aspect ratio of the hindwing, with a small modulating effect produced by the forewing-hindwing interactions. On the other hand, the aerodynamic performance of the hindwing is clearly affected by the interaction with the forewing’s TEV. Tandem configurations with a larger aspect r...
INTRODUCTION 'Multimorbidity' describes the presence of two or more long-term conditions,... more INTRODUCTION 'Multimorbidity' describes the presence of two or more long-term conditions, which can include communicable, non-communicable diseases, and mental disorders. The rising global burden from multimorbidity is well documented, but trial evidence for effective interventions in low-/middle-income countries (LMICs) is limited. Selection of appropriate outcomes is fundamental to trial design to ensure cross-study comparability, but there is currently no agreement on a core outcome set (COS) to include in trials investigating multimorbidity specifically in LMICs. Our aim is to develop international consensus on two COSs for trials of interventions to prevent and treat multimorbidity in LMIC settings. METHODS AND ANALYSIS Following methods recommended by the Core Outcome Measures in Effectiveness Trials initiative, the development of these two COSs will occur in parallel in three stages: (1) generation of a long list of potential outcomes for inclusion; (2) two-round onli...
Uno de los problemas más frecuentes en la enseñanza de la pintura virreinal de la Nueva España a ... more Uno de los problemas más frecuentes en la enseñanza de la pintura virreinal de la Nueva España a los estudiantes extranjeros, es la falta de referentes culturales, particularmente en el caso de los estudiantes orientales, quienes no sólo se enfrentan con el problema de aprender una lengua occidental radicalmente diferente a la propia, sino que también, en la mayoría de los casos, carecen de elementos relacionados con distintos aspectos de la cultura occidental, los cuales les permitirían comprender significativamente la pintura producida en Europa y América durante los siglos XVI al XVIII. En este trabajo se abordará brevemente dicha problemática y se expondrán algunos de los recursos metodológicos que he desarrollado para poder preparar el curso, con el objetivo primordial de que los alumnos puedan entender conceptos y procesos fundamentales de la historia del arte occidental en general y de la historia de la pintura virreinal novohispana en particular.
El presente trabajo es una reflexión sobre el tema de interculturalidad y globalización, abordado... more El presente trabajo es una reflexión sobre el tema de interculturalidad y globalización, abordado desde una forma particular, mi experiencia como docente de la materia de Historia del Arte. Enseñar arte mexicano a estudiantes extranjeros conlleva el reto de superar una serie de dificultades derivadas de las diferencias culturales de los alumnos. Las ideas que aquí presento se basan principalmente en el análisis del diversos instrumentos de evaluación interna aplicados en el curso.
Background: Over the past decade, tele-stroke networks have been shown to remarkably improve our ... more Background: Over the past decade, tele-stroke networks have been shown to remarkably improve our ability to provide timely treatments for stroke patients. Data on the economic impact of tele-stroke networks are scarce. Our aim is to assess the economic impact associated with the adoption of tele-stroke in local, geographically defined areas in the state of South Carolina (SC). Methods: Data were extracted from SC All-payer hospital discharges database from 2014-1017. Patients included were admitted with primary diagnosis ICD-9 codes for acute ischemic stroke. SC tele-stroke tracking data was used to assign county exposure. Data was analyzed using multivariable logistic, Poisson and gamma regression models with robust error variance in Proc Genmod to estimate effects. Multiple variables were assessed including tPA treatment, mechanical thrombectomy, and cost of in-hospital and follow up care for readmissions or ED visits in patients that had tele-stroke available in-county compared t...
In Reunion Island, the feasibility of an Aedes albopictus control program using the Sterile Insec... more In Reunion Island, the feasibility of an Aedes albopictus control program using the Sterile Insect Technique (SIT) is studied. Because, in some regions, Ae. albopictus is living in sympatry with Aedes aegypti, the impact of releasing millions of sterile male Ae. albopictus on female Ae. aegypti reproduction needs to be assessed. Thus, to study the potential heterospecific matings, a marking technique using rhodamine B has been used. Rhodamine is given in solution to male mosquitoes to be incorporated into the male body and seminal fluid and transferred during mating into the bursa inseminalis and spermathecae of females. The presence of rhodamine in females occurred in 15% of cases when Ae. aegypti females were offered non-irradiated Ae. albopictus males, 5% when offered irradiated Ae. albopictus males and 18% of cases in the inverse heterospecific matings. Moreover, our results also showed that these matings gave few eggs but were not viable. Finally, the results showed that whatev...
Introduction 'Multimorbidity' describes the presence of two or more long-term conditions,... more Introduction 'Multimorbidity' describes the presence of two or more long-term conditions, which can include communicable and non-communicable diseases, and mental disorders. The rising global burden from multimorbidity is well-documented, but trial evidence for effective interventions in low- and middle-income countries (LMICs) is limited. Selection of appropriate outcomes is fundamental to trial design to ensure cross-study comparability, but there is currently no agreement on a core outcome set (COS) to include in trials investigating multimorbidity specifically in LMIC. Our aim is to develop international consensus on two COS for trials of interventions to prevent and treat multimorbidity in LMIC settings. Methods and Analysis Following methods recommended by the Core Outcome Measures in Effectiveness Trials (COMET initiative), the development of these two COS will occur in three stages: (1) generation of a long list of potential outcomes for inclusion; (2) two-round onli...
2017 International Conference on Intelligent Computing, Instrumentation and Control Technologies (ICICICT), 2017
In the manufacturing industry, both humans and robots are required in various phases of its opera... more In the manufacturing industry, both humans and robots are required in various phases of its operations. While a robot can do complicated tasks repeatedly and precisely, humans are required for strategic analysis and spontaneous decision-making. Safety of the human operator is one of the most important challenges in such a collaborative system. The paper reviews existing collaboration techniques for industrial manipulators and propose a simple and low cost sensor based collaborative framework for human safety. An ultrasonic radar with passive infrared sensors are used to detect human activity in the robot work cell. The sensor framework is designed and validated for its accuracy and response time. The functionality of the system with the manipulator has been verified for a pick and place operation running in ROS based simulation.
Molecular phylogenetics and evolution, Oct 21, 2017
The description of cryptic gecko species worldwide has revealed both that many putative species a... more The description of cryptic gecko species worldwide has revealed both that many putative species are, in fact, conformed by a complex of morphologically conserved species that are genetically distinct and highly divergent, and that gecko species diversity could be underestimated. The taxonomy and species delimitation of geckos belonging to the genus Phyllodactylus is still controversial, 16 of which are distributed in Mexico and 13 are endemic. Although the large morphological variation shown by the Phyllodactylus species from Mexico has been amply documented, little is known about their genetic diversity and evolutionary relationships, and much less regarding cryptic speciation. Here, we included the most comprehensive sampling of populations and species of the Phyllodactylus lanei complex distributed in Mexico, and applied an analytical approach that included probabilistic phylogenetic analyses, jointly with species delimitation methods and Bayesian putative species validation anal...
The properties of vortex clusters in rough-walled turbulent channels are analysed using direct nu... more The properties of vortex clusters in rough-walled turbulent channels are analysed using direct numerical simulations at Retau 600, in which roughness is simulated by distributions of velocity disturbances at the walls. The results are compared with data coming from smooth channels (del 'Alamo et al 2006 JFM 561). As in the smooth case, the present clusters separate into wall-detached objects and wall-attached ones. The detached clusters from rough and smooth walls are similar, consistent with their definition. Also expected, the attached clusters inside the roughness sublayer are quite different to those in the near-wall region over smooth walls. However, the attached clusters that reach above the buffer region are quite independent of the nature of the wall. The same result is obtained for the average velocity field conditioned to these tall attached clusters. This suggests that the dynamics of the logarithmic and outer regions depends only on the mean velocity gradient, even ...
The vortex clusters in the turbulent outer region of rough- and smooth-walled channels, and their... more The vortex clusters in the turbulent outer region of rough- and smooth-walled channels, and their associated velocity structures, are compared using data from numerical experiments at friction Reynolds numbers Reτ ≤ 674. The results indicate that the roughness of the wall does not affect their properties, particularly the existence of wall-detached and wall-attached populations, and the self-similar size distribution of the latter. The average flow field conditioned to the attached clusters reveals similar conical structures of low streamwise velocity for the rough- and smooth-walled cases, which eventually grow into the global modes previously identified from spectral analysis. We conclude that the vortex clusters of the turbulent outer region either originate away from the wall, or quickly forget their origin, in agreement with Townsend's similarity hypothesis.
Importance Most of the global morbidity and mortality in chronic obstructive pulmonary disease (C... more Importance Most of the global morbidity and mortality in chronic obstructive pulmonary disease (COPD) occurs in low- and middle-income countries (LMICs), with significant economic effects. Objective To assess the discriminative accuracy of 3 instruments using questionnaires and peak expiratory flow (PEF) to screen for COPD in 3 LMIC settings. Design, Setting, and Participants A cross-sectional analysis of discriminative accuracy, conducted between January 2018 and March 2020 in semiurban Bhaktapur, Nepal; urban Lima, Peru; and rural Nakaseke, Uganda, using a random age- and sex-stratified sample of the population 40 years or older. Exposures Three screening tools, the COPD Assessment in Primary Care to Identify Undiagnosed Respiratory Disease and Exacerbation Risk (CAPTURE; range, 0-6; high risk indicated by a score of 5 or more or score 2-5 with low PEF [<250 L/min for females and <350 L/min for males]), the COPD in LMICs Assessment questionnaire (COLA-6; range, 0-5; high ris...
We report direct numerical simulations of a pair of wings in horizontal tandem configuration, to ... more We report direct numerical simulations of a pair of wings in horizontal tandem configuration, to analyze the effect of their aspect ratio on the flow and the aerodynamic performance of the system. The wings are immersed in a uniform free-stream at Reynolds number Re = 1000, and they undergo heaving and pitching oscillation with Strouhal number St = 0.7. The aspect ratios of forewing and hindwing vary between 2 and 4. The aerodynamic performance of the system is dictated by the interaction between the trailing edge vortex (TEV) shed by the forewing and the induced leading edge vortex formed on the hindwing. The aerodynamic performance of the forewing is similar to that of an isolated wing irrespective of the aspect ratio of the hindwing, with a small modulating effect produced by the forewing-hindwing interactions. On the other hand, the aerodynamic performance of the hindwing is clearly affected by the interaction with the forewing’s TEV. Tandem configurations with a larger aspect r...
INTRODUCTION 'Multimorbidity' describes the presence of two or more long-term conditions,... more INTRODUCTION 'Multimorbidity' describes the presence of two or more long-term conditions, which can include communicable, non-communicable diseases, and mental disorders. The rising global burden from multimorbidity is well documented, but trial evidence for effective interventions in low-/middle-income countries (LMICs) is limited. Selection of appropriate outcomes is fundamental to trial design to ensure cross-study comparability, but there is currently no agreement on a core outcome set (COS) to include in trials investigating multimorbidity specifically in LMICs. Our aim is to develop international consensus on two COSs for trials of interventions to prevent and treat multimorbidity in LMIC settings. METHODS AND ANALYSIS Following methods recommended by the Core Outcome Measures in Effectiveness Trials initiative, the development of these two COSs will occur in parallel in three stages: (1) generation of a long list of potential outcomes for inclusion; (2) two-round onli...
Uno de los problemas más frecuentes en la enseñanza de la pintura virreinal de la Nueva España a ... more Uno de los problemas más frecuentes en la enseñanza de la pintura virreinal de la Nueva España a los estudiantes extranjeros, es la falta de referentes culturales, particularmente en el caso de los estudiantes orientales, quienes no sólo se enfrentan con el problema de aprender una lengua occidental radicalmente diferente a la propia, sino que también, en la mayoría de los casos, carecen de elementos relacionados con distintos aspectos de la cultura occidental, los cuales les permitirían comprender significativamente la pintura producida en Europa y América durante los siglos XVI al XVIII. En este trabajo se abordará brevemente dicha problemática y se expondrán algunos de los recursos metodológicos que he desarrollado para poder preparar el curso, con el objetivo primordial de que los alumnos puedan entender conceptos y procesos fundamentales de la historia del arte occidental en general y de la historia de la pintura virreinal novohispana en particular.
El presente trabajo es una reflexión sobre el tema de interculturalidad y globalización, abordado... more El presente trabajo es una reflexión sobre el tema de interculturalidad y globalización, abordado desde una forma particular, mi experiencia como docente de la materia de Historia del Arte. Enseñar arte mexicano a estudiantes extranjeros conlleva el reto de superar una serie de dificultades derivadas de las diferencias culturales de los alumnos. Las ideas que aquí presento se basan principalmente en el análisis del diversos instrumentos de evaluación interna aplicados en el curso.
Background: Over the past decade, tele-stroke networks have been shown to remarkably improve our ... more Background: Over the past decade, tele-stroke networks have been shown to remarkably improve our ability to provide timely treatments for stroke patients. Data on the economic impact of tele-stroke networks are scarce. Our aim is to assess the economic impact associated with the adoption of tele-stroke in local, geographically defined areas in the state of South Carolina (SC). Methods: Data were extracted from SC All-payer hospital discharges database from 2014-1017. Patients included were admitted with primary diagnosis ICD-9 codes for acute ischemic stroke. SC tele-stroke tracking data was used to assign county exposure. Data was analyzed using multivariable logistic, Poisson and gamma regression models with robust error variance in Proc Genmod to estimate effects. Multiple variables were assessed including tPA treatment, mechanical thrombectomy, and cost of in-hospital and follow up care for readmissions or ED visits in patients that had tele-stroke available in-county compared t...
In Reunion Island, the feasibility of an Aedes albopictus control program using the Sterile Insec... more In Reunion Island, the feasibility of an Aedes albopictus control program using the Sterile Insect Technique (SIT) is studied. Because, in some regions, Ae. albopictus is living in sympatry with Aedes aegypti, the impact of releasing millions of sterile male Ae. albopictus on female Ae. aegypti reproduction needs to be assessed. Thus, to study the potential heterospecific matings, a marking technique using rhodamine B has been used. Rhodamine is given in solution to male mosquitoes to be incorporated into the male body and seminal fluid and transferred during mating into the bursa inseminalis and spermathecae of females. The presence of rhodamine in females occurred in 15% of cases when Ae. aegypti females were offered non-irradiated Ae. albopictus males, 5% when offered irradiated Ae. albopictus males and 18% of cases in the inverse heterospecific matings. Moreover, our results also showed that these matings gave few eggs but were not viable. Finally, the results showed that whatev...
Introduction 'Multimorbidity' describes the presence of two or more long-term conditions,... more Introduction 'Multimorbidity' describes the presence of two or more long-term conditions, which can include communicable and non-communicable diseases, and mental disorders. The rising global burden from multimorbidity is well-documented, but trial evidence for effective interventions in low- and middle-income countries (LMICs) is limited. Selection of appropriate outcomes is fundamental to trial design to ensure cross-study comparability, but there is currently no agreement on a core outcome set (COS) to include in trials investigating multimorbidity specifically in LMIC. Our aim is to develop international consensus on two COS for trials of interventions to prevent and treat multimorbidity in LMIC settings. Methods and Analysis Following methods recommended by the Core Outcome Measures in Effectiveness Trials (COMET initiative), the development of these two COS will occur in three stages: (1) generation of a long list of potential outcomes for inclusion; (2) two-round onli...
2017 International Conference on Intelligent Computing, Instrumentation and Control Technologies (ICICICT), 2017
In the manufacturing industry, both humans and robots are required in various phases of its opera... more In the manufacturing industry, both humans and robots are required in various phases of its operations. While a robot can do complicated tasks repeatedly and precisely, humans are required for strategic analysis and spontaneous decision-making. Safety of the human operator is one of the most important challenges in such a collaborative system. The paper reviews existing collaboration techniques for industrial manipulators and propose a simple and low cost sensor based collaborative framework for human safety. An ultrasonic radar with passive infrared sensors are used to detect human activity in the robot work cell. The sensor framework is designed and validated for its accuracy and response time. The functionality of the system with the manipulator has been verified for a pick and place operation running in ROS based simulation.
Uploads