Now showing items 1607-1620 of 1620

    • Water quality index based on fuzzy logic applied to the aburra river basin in the jurisdiction of the metropolitan area 

      González H., Juan D.; Carvajal Serna, Luis Fernando; Toro Botero, Francisco Mauricio
      The inherent uncertainties, subjectivity, and engineering challenges in environmental problems are increasingly being worked upon computing methods based on artifi cial intelligence (AI), including computerized tools that ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Water quality modeling of the Medellin river in the Aburrá Valley 

      Giraldo Buitrago, Lina Claudia; Palacio, Carlos Alberto; Molina, Rubén Darío; Agudelo García, Rubén Alberto
      Water quality modeling intends to represent a water body in order to assess their status and project the effects of different measures taken for their protection. This paper presents the results obtained from the Qual2kw ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Wave energy resource assessment at southern coast of the Gulf of Mexico 

      Gonzalez-Carrillo, Alejandro; Ruiz-Cabrera, Raziel; Hernandez-Escobedo, Quetzalcoatl Cruz; Fernández-García, Aranzazú; Manzano-Agugliaro, Francisco
      Find alternative energy sources is one of the challenges that came with XXI century and this paper makes an analysis about wave energy, which presents several advantages over fossil based energy and even other renewable ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Wear resistance of vanadium-niobium carbide layers grown via TRD 

      Castillejo Nieto, Fabio Enrique; Olaya Florez, Jhon Jairo; Alfonso, José Edgar
      Nb-V complex carbide coatings were produced on AISI D2 steel substrates using the thermo-reactive diffusion (TRD) process in order to improve the surface hardness and wear resistance of this tool steel. The carbide coating ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Wearable low-cost inertial sensor-based electrogoniometer for measuring joint range of motion 

      Ruiz-Olaya, Andrés F.; Callejas-Cuervo, Mauro; Lara-Herrera, Claudia N.
      Human movement analysis have become fundamental for a wide range of applications, such as physical therapies, neuro-rehabilitation, sports medicine, human motor system performance assessment and occupational medicine. This ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Web-based spatial data infrastructure: a solution for the sustainable management of thematic information supported by aerial orthophotography 

      Hernandez López, David; Felipe García, Beatriz; González Aguilera, Diego; Arias Pérez, Benjamín
      Under the framework of the Spanish National Plan for Aerial Orthophotography in Castilla-La Mancha, a web-based spatial data infrastructure has been developed that allows both the sustainable management of spatial and ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Weibull accelerated life testing analysis with several variables using multiple linear regression 

      Piña-Monarrez, Manuel R.; Ávila-Chávez, Carlos A.; Márquez-Luévano, Carlos D.
      In Weibull accelerated life test analysis (ALT) with two or more variables (X2, X3, ... Xk), we estimated, in joint form, the parameters of the life stress model r{X(t)} and one shape parameter β. These were then used to ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Weighted salience allocation to goals in the unc-method 

      Zapata Jaramillo, Carlos Mario; Acevedo, Juan Fernando; Moreno Niño, David
      The KAOS (Knowledge Acquisition autOmated Specifi cation) goal diagram can be used to hierarchically represent and analyze organizational goals. In the context of the UNC-Method, such goals are often written in the ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Weighted time series analysis for electroencephalographic source localization 

      Giraldo Suárez, Eduardo; Castellanos Domínguez, César Germán; Peluffo Ordoñez, Diego Hernán
      This paper presents a new method to estimate neural activity from electroencephalographic signals using a weighted time series analysis. The method considers a physiologically based linear model that takes both spatial and ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Wideband PIFA antenna for higher LTE band applications 

      Suárez-Fajardo, Carlos Arturo; Rodríguez León, Rafael Armando; Antonino Daviú, Eva
      This paper introduces a broadband planar inverted-F antenna (PIFA) with U–Shaped capacitive feed technique for higher LTE band applications. The proposed antenna is based on a simple PIFA, where the capacitive feed plate, ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Wireless surveillance sytem for greenhouse crops 

      Cama-Pinto, Alejandro; Gil-Montoya, Francisco; Gómez-López, Julio; García-Cruz, Amos; Manzano-Agugliaro, Francisco
      The agriculture in the southeast Spain has experimented important changes in the last years due to the greenhouse crops. In this kind of crops is very important the use of advanced techniques and new technologies to improve ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Xps structure analysis of tin/tic bilayers produced by pulsed vacuum arc discharge 

      Restrepo Parra, Elisabeth; Arango Arango, Pedro José; Benavides Palacios, Vicente Javier
      TiN/TiC Bilayers were grown on 304 stainless steel substrates using physical vapour deposition assisted by pulsed arc plasma system (PAPVD) at two substrate temperatures (50º C and 150º C). X ray photoelectron spectroscopy ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Zeolitas LTA y FAU obtenidas a partir de cenizas volantes y su aplicación en remoción de Cromo 

      Arroyave-Manco, Juan Camilo; Arboleda-Echavarria, Johana Catalina; Hoyos-Ayala, Dora Angela; Echavarria-Isaza, Adriana Patricia
      En este artículo se describe el proceso de síntesis de zeolitas LTA y/o FAU a partir de residuos obtenidos de la industria minera y manufacturera de Antioquia (Colombia), y su uso para la remoción de Cr (III). Los residuos ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Zr o₂ tetragonal obtenido por el método de precipitación controlada 

      Campo Ceballos, Diego Andrés; Rodríguez Páez, Jorge Enrique
      En este trabajo se utilizó el método de precipitación controlada para sintetizar ZrO₂ tetragonal estabilizado con óxido de calcio, CaO. Los sólidos obtenidos se caracterizaron utilizando análisis térmico diferencial y ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna.