Caracterización biológica y ecológica de las comunidades de plantas acuáticas, plantas terrestres y macroinvertebrados y caracterización físico-química de aguas, de la ventana de estudio de la Ciénaga de La Virgen

Este documento es resultado de la ejecución del contrato 14-13-014-237PS entre el Instituto Humboldt y la Fundación Omacha, firmado en el marco del convenio 005 (13-014) entre el Instituto Humboldt y el Fondo Adaptación. Contiene la caracterización biológica y ecológica de las comunidades de plantas acuáticas, plantas terrestres y macroinvertebrados, y la caracterización físico-química de aguas, de la ventana de estudio ciénaga de La Virgen.BogotáSubdirección de Servicios Científicos y Proyectos Especiale

Caracterización biológica y ecológica de las comunidades de plantas acuáticas, plantas terrestres y macroinvertebrados, y caracterización físico-química de aguas de la ventana piloto de estudio Ciénaga de Zapatosa

Este documento es resultado de la ejecución del contrato 14-13-014-237PS entre el Instituto Humboldt y la Fundación Omacha, firmado en el marco del convenio 005 (13-014) entre el Instituto Humboldt y el Fondo Adaptación. Contiene la caracterización biológica y ecológica de las comunidades de plantas acuáticas, plantas terrestres y macroinvertebrados, y caracterización físico-química de aguas, de la ventana piloto de estudio de la ciénaga de Zapatosa.BogotáSubdirección de Servicios Científicos y Proyectos Especiale

Caracterización biológica de Paz de Ariporo. Identificación de especies claves para establecer límites de humedales.

Se exponen los resultados y evaluaciones en campo de la ventana piloto de humedales de Paz de Ariporo- Hato Corozal en el marco del convenio 005 (13-014) entre el Instituto Humboldt y el Fondo Adaptación.BogotáSubdirección de Servicios Científicos y Proyectos Especiale

Interferometría sísmica a partir de registros de un fracturamiento hidráulico orientada a establecer condiciones locales de esfuerzos para la generación de imágenes tomográficas basadas en datos microsísmicos y ruido ambiental

Para la realización de este trabajo se desplegó un arreglo sísmico lineal de 17 acelerómetros triaxiales separados aproximadamente cada 70 m, alineados con la boca de un pozo productor del Campo Chichimene, cuenca Llanos Orientales de Colombia. En este experimento se adquirió información por 80 horas continuas a una frecuencia de muestreo de 500 mps, que involucró el tiempo previo y posterior a una actividad de fracturamiento hidráulico realizada en Noviembre de 2012. Un preprocesamiento orientado a la eliminación de datos espurios, saltos por submuestreo electrónico y la respectiva filtración en bandas deseadas, permitió consolidar registros continuos para la aplicación sistemática de correlaciones cruzadas entre todas las estaciones y su respectivo apilado, obteniendo CDPs que permitieron ensamblar una imagen interferométrica. La aplicación de la interferometría sísmica con modelos de velocidad 1D del área, llevaron a identificar reflectores consistentes con la estratigrafía. Además de las condiciones locales de esfuerzo a partir de la función temporal de la fuente sísmica. Comparaciones entre las imágenes estimadas en este trabajo, con las construidas con un modelo sintético y otras adquiridas por la industria petrolera en la zona, permiten identificar importantes contrastes acústicos de las principales unidades.Abstract. To carry out this work was deployed a linear seismic array of 17 triaxial accelerometers spaced approximately every 70 m, aligned with the mouth of a producing well of Chichimene Field, Llanos Orientales basin of Colombia. In this experiment, data were acquired for 80 continuous hours at a sampling frequency of 500 mps, which involved the time before and after hydraulic fracturing activity held in November 2012. A preprocessing oriented towards the elimination of spurious data, jumps for electronic subsampling and the respective filtration desired bands, allowed consolidating continuous records, for the systematic application of cross-correlations between all stations and their respective stack, which obtained CDPs for assemble an interferometric image. The application of seismic interferometry with 1D velocity models of the area, allowed to identify reflectors consistent with the stratigraphy. As well as local stress conditions from the seismic source time function. Comparisons between the estimated images in this work, in addition to those built with a synthetic model and skills gained by the oil industry in the area, to identify important acoustic contrasts of the main units.Maestrí

Aplicación de criterios bioecológicos para la identificación, caracterización y establecimiento de límites funcionales en humedales de las sabanas inundables de la Orinoquia

En este libro se consolida entonces todo el proceso de caracterización biológica de los humedales de los llanos de Hato Corozal, la identificación de las especies clave para establecer los límites funcionales de los humedales y se presentan perfiles estructurales que permiten identificar la presencia de especies, su zonación ecológica y variación estacional en todos los tipos humedal, un trabajo sin duda alguna que espera contribuir con el debate global acerca de la conservación, uso y manejo de los humedales en tiempos de adaptación al cambio climático.Bogotá, D. C., ColombiaInstituto de Investigación de Recursos Biológicos Alexander von Humbold

Libro de Proyectos Finales 2021 primer semestre

PregradoIngeniero CivilIngeniero de SistemasIngeniero ElectricistaIngeniero ElectrónicoIngeniero IndustrialIngeniero Mecánic

Effects of pre-operative isolation on postoperative pulmonary complications after elective surgery: an international prospective cohort study an international prospective cohort study

We aimed to determine the impact of pre-operative isolation on postoperative pulmonary complications after elective surgery during the global SARS-CoV-2 pandemic. We performed an international prospective cohort study including patients undergoing elective surgery in October 2020. Isolation was defined as the period before surgery during which patients did not leave their house or receive visitors from outside their household. The primary outcome was postoperative pulmonary complications, adjusted in multivariable models for measured confounders. Pre-defined sub-group analyses were performed for the primary outcome. A total of 96,454 patients from 114 countries were included and overall, 26,948 (27.9%) patients isolated before surgery. Postoperative pulmonary complications were recorded in 1947 (2.0%) patients of which 227 (11.7%) were associated with SARS-CoV-2 infection. Patients who isolated pre-operatively were older, had more respiratory comorbidities and were more commonly from areas of high SARS-CoV-2 incidence and high-income countries. Although the overall rates of postoperative pulmonary complications were similar in those that isolated and those that did not (2.1% vs 2.0%, respectively), isolation was associated with higher rates of postoperative pulmonary complications after adjustment (adjusted OR 1.20, 95%CI 1.05–1.36, p = 0.005). Sensitivity analyses revealed no further differences when patients were categorised by: pre-operative testing; use of COVID-19-free pathways; or community SARS-CoV-2 prevalence. The rate of postoperative pulmonary complications increased with periods of isolation longer than 3 days, with an OR (95%CI) at 4–7 days or ≥ 8 days of 1.25 (1.04–1.48), p = 0.015 and 1.31 (1.11–1.55), p = 0.001, respectively. Isolation before elective surgery might be associated with a small but clinically important increased risk of postoperative pulmonary complications. Longer periods of isolation showed no reduction in the risk of postoperative pulmonary complications. These findings have significant implications for global provision of elective surgical care. We aimed to determine the impact of pre-operative isolation on postoperative pulmonary complications after elective surgery during the global SARS-CoV-2 pandemic. We performed an international prospective cohort study including patients undergoing elective surgery in October 2020. Isolation was defined as the period before surgery during which patients did not leave their house or receive visitors from outside their household. The primary outcome was postoperative pulmonary complications, adjusted in multivariable models for measured confounders. Pre-defined sub-group analyses were performed for the primary outcome. A total of 96,454 patients from 114 countries were included and overall, 26,948 (27.9%) patients isolated before surgery. Postoperative pulmonary complications were recorded in 1947 (2.0%) patients of which 227 (11.7%) were associated with SARS-CoV-2 infection. Patients who isolated pre-operatively were older, had more respiratory comorbidities and were more commonly from areas of high SARS-CoV-2 incidence and high-income countries. Although the overall rates of postoperative pulmonary complications were similar in those that isolated and those that did not (2.1% vs 2.0%, respectively), isolation was associated with higher rates of postoperative pulmonary complications after adjustment (adjusted OR 1.20, 95%CI 1.05–1.36, p = 0.005). Sensitivity analyses revealed no further differences when patients were categorised by: pre-operative testing; use of COVID-19-free pathways; or community SARS-CoV-2 prevalence. The rate of postoperative pulmonary complications increased with periods of isolation longer than 3 days, with an OR (95%CI) at 4–7 days or ≥ 8 days of 1.25 (1.04–1.48), p = 0.015 and 1.31 (1.11–1.55), p = 0.001, respectively. Isolation before elective surgery might be associated with a small but clinically important increased risk of postoperative pulmonary complications. Longer periods of isolation showed no reduction in the risk of postoperative pulmonary complications. These findings have significant implications for global provision of elective surgical care