Given the growing number of prediction algorithms developed to predict COVID-19 mortality, we eva... more Given the growing number of prediction algorithms developed to predict COVID-19 mortality, we evaluated the transportability of a mortality prediction algorithm using a multi-national network of healthcare systems. We predicted COVID-19 mortality using baseline commonly measured laboratory values and standard demographic and clinical covariates across healthcare systems, countries, and continents. Specifically, we trained a Cox regression model with nine measured laboratory test values, standard demographics at admission, and comorbidity burden pre-admission. These models were compared at site, country, and continent level. Of the 39,969 hospitalized patients with COVID-19 (68.6% male), 5717 (14.3%) died. In the Cox model, age, albumin, AST, creatine, CRP, and white blood cell count are most predictive of mortality. The baseline covariates are more predictive of mortality during the early days of COVID-19 hospitalization. Models trained at healthcare systems with larger cohort size ...
The vibration that occurs in every rotating element (specifically in turbomachinery elements) gen... more The vibration that occurs in every rotating element (specifically in turbomachinery elements) generates effects that modify its operation and therefore its performance, which causes the system to compromise and not operate in nominal conditions. Of all the types of vibration that can occur due to various sources of excitement: body or flow scattering, what is clear is the generation of a forced vibration: where a self-excited vibration is generated and whose source energy It generates dynamic instability, which can lead to catastrophic failures due to the complexity of predicting these effects during design. Recent studies focus on aeroelasticity in the rotating elements, when using this approach, the elasticity equations and the aerodynamic forces generated in the blades are used, thus obtaining the equations of aeroelasticity, thus these equations are discretized and it is solved numerically to obtain the corresponding approximations.
Un programa de cartografía geológica e investigación mineral en Colombia fue emprendido conjuntam... more Un programa de cartografía geológica e investigación mineral en Colombia fue emprendido conjuntamente por el Instituto Nacional de Investigaciones Geológico-Mineras (antiguo Inventario Minero Nacional); y el U.S. Geological Survey, patrocinado por el Gobierno de Colombia y la Agency for international Development, U.S. Department of State. El propósito fue estudiar y evaluar los recursos minerales (excluyendo petróleo, carbón, esmeraldas, y oro aluvial) de cuatro áreas seleccionadas, designadas Zonas I a IV, que totalizan cerca de 70 000 km2. El trabajo en la Zona III, en la cordillera Oriental, fue realizado de 1965 a 1968. La cordillera Oriental de Colombia, de rumbo nor-oriental1 tuerce bruscamente a nornoroeste en el área de este trabajo y luego se bifurca alrededor del extremo sur de la Cuenca de Maracaibo. Esta sección de la cordillera Oriental se denomina Macizo de Santander. Las determinaciones radiométricas indican que las rocas más antiguas del Macizo de Santander correspon...
Given the growing number of prediction algorithms developed to predict COVID-19 mortality, we eva... more Given the growing number of prediction algorithms developed to predict COVID-19 mortality, we evaluated the transportability of a mortality prediction algorithm using a multi-national network of healthcare systems. We predicted COVID-19 mortality using baseline commonly measured laboratory values and standard demographic and clinical covariates across healthcare systems, countries, and continents. Specifically, we trained a Cox regression model with nine measured laboratory test values, standard demographics at admission, and comorbidity burden pre-admission. These models were compared at site, country, and continent level. Of the 39,969 hospitalized patients with COVID-19 (68.6% male), 5717 (14.3%) died. In the Cox model, age, albumin, AST, creatine, CRP, and white blood cell count are most predictive of mortality. The baseline covariates are more predictive of mortality during the early days of COVID-19 hospitalization. Models trained at healthcare systems with larger cohort size ...
The vibration that occurs in every rotating element (specifically in turbomachinery elements) gen... more The vibration that occurs in every rotating element (specifically in turbomachinery elements) generates effects that modify its operation and therefore its performance, which causes the system to compromise and not operate in nominal conditions. Of all the types of vibration that can occur due to various sources of excitement: body or flow scattering, what is clear is the generation of a forced vibration: where a self-excited vibration is generated and whose source energy It generates dynamic instability, which can lead to catastrophic failures due to the complexity of predicting these effects during design. Recent studies focus on aeroelasticity in the rotating elements, when using this approach, the elasticity equations and the aerodynamic forces generated in the blades are used, thus obtaining the equations of aeroelasticity, thus these equations are discretized and it is solved numerically to obtain the corresponding approximations.
Un programa de cartografía geológica e investigación mineral en Colombia fue emprendido conjuntam... more Un programa de cartografía geológica e investigación mineral en Colombia fue emprendido conjuntamente por el Instituto Nacional de Investigaciones Geológico-Mineras (antiguo Inventario Minero Nacional); y el U.S. Geological Survey, patrocinado por el Gobierno de Colombia y la Agency for international Development, U.S. Department of State. El propósito fue estudiar y evaluar los recursos minerales (excluyendo petróleo, carbón, esmeraldas, y oro aluvial) de cuatro áreas seleccionadas, designadas Zonas I a IV, que totalizan cerca de 70 000 km2. El trabajo en la Zona III, en la cordillera Oriental, fue realizado de 1965 a 1968. La cordillera Oriental de Colombia, de rumbo nor-oriental1 tuerce bruscamente a nornoroeste en el área de este trabajo y luego se bifurca alrededor del extremo sur de la Cuenca de Maracaibo. Esta sección de la cordillera Oriental se denomina Macizo de Santander. Las determinaciones radiométricas indican que las rocas más antiguas del Macizo de Santander correspon...
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