| Table of contents Tecnura vol.25 no.67 Bogotá Jan./Mar. 2021 Editorial | | | | · Editorial García Ubaque, Cesar Augusto
| | | Research | | | | · Use of the Speed of Sound for Heights Below the Troposphere in Colombia to Determine the Distance of Lightning Strikes Rubiano Cruz, Jonathan Jair; Chacón Cardona, César Alexander; Torres Sánchez, Horacio
| | | | · Electrocoagulation as an alternative treatment for mixed wastewater originated in the dairy and meat processing industry Rodríguez Díaz, Yim James; Fuentes Guevara, Miguel David; Beleño Díaz, Óscar David; Montoya Armenta, Luis Hernando
| | | | · Location estimation of multiple sources based on direction of arrival applying compressed sensing theory Sánchez-Quintero, Tibisay; Gómez-Santamaría, Cristina; Hincapié-Reyes, Roberto Carlos
| | | Case Study | | | | · Development of a mobile APP for interactive learning in civil engineering problems: application to open-channel hydraulics Ladino Moreno, Edgar Orlando; García-Ubaque, César Augusto; Pineda-Jaimes, Jorge Arturo
| | | | · Design of an Impact Attenuator Using Alternative Material Rojas Reinoso, Edgar Vicente; Romero Hidalgo, Vicente Javier; Pancha Ramos, Johnny Marcelo; Néjer Guerreo, Jorge Mauricio
| | | | · Flood sites caused by the La Vega and Jordán rivers, Tunja (Boyacá). Perico-Granados, Néstor Rafael; Arévalo Algarra, Heidy Madeleine; Reyes-Rodríguez, Carlos Andrés; Perico-Martínez, Camilo Andrés; Vera, María Claudia; Monroy G, Jackson
| | | Review | | | | · Stories, Living Experiences, And Generational Meanings In The Use Of Ecosystem Resources: San Juanito, Meta Colombia Montealegre Torres, Francy Liliana; Quintero Romero, Dulce María; Czerny, Miroslawa; Velasco, Roció López
| | | | · Perspective for the use of the p6 model of health under a scenario supported by the IoT and Blockchain Pava Díaz, Roberto Albeiro; Pérez Castillo, José Nelson; Niño Vásquez, Luis Fernando
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