Now showing items 267-286 of 940

    • Early warning method for the commodity prices based on artificial neural networks: SMEs case 

      Silva, Jesus; Mojica Herazo, Julio Cesar; Rojas Millán, Rafael Humberto; Pineda Lezama, Omar Bonerge; Morgado Gamero, W.B.; Varela Izquierdo, Noel (Procedia Computer Science, 2019)
      Applications based on Artificial Neural Networks (ANN) have been developed thanks to the advance of the technological progress which has permitted the development of sales forecasting on consumer products, improving the ...
    • Early warning system for detection of urban pluvial flooding hazard levels in an ungauged basin 

      Acosta Coll, Melisa Andrea; Ballester Merelo, Francisco Jose; Martínez Peiro, Marcos Antonio (Natural Hazards, 2018-06-01)
      Prolonged and high intensity rainfall often saturates urban drainage systems and generates urban pluvial flooding, resulting in hazardous flash floods. The city most affected by urban flooding in Colombia (South America) ...
    • An Easy Method to Prepare D3 and C2-TATP Crystals 

      Espinosa Fuentes, Eduardo Antonio; Colpas Castillo, Fredy; Meza Fuentes, Edgardo; Ropero, Jorge (Propellants, Explosives, Pyrotechnics, 2016)
      D3 and C2 TATP structures interconvert at room temperature. Herein, an easy method to isolate both conformers is shown that consists of multiple recrystallization steps using different solvent and heating to boiling. ...
    • Econometric analysis of the industrial growth determinants in Colombia 

      Henao Rodriguez, Carolina; Lis Gutierrez, Jenny Paola; Gaitan, Mercedes; Malagón, Luz Elena; Viloria Silva, Amelec Jesus (Universidad de la Costa, 2018)
      An econometric study is carried out using a panel data model with fixed effects to identify the industrial development determinants in Colombia during the term 2005–2015. The database used in the study corresponds to World ...
    • Econometric analysis of the industrial growth determinants in Colombia 

      Henao Rodriguez, Carolina; Lis Gutierrez, Jenny Paola; Gaitan, Mercedes; Malagón, Luz Elena; Viloria Silva, Amelec Jesus (Lecture Notes in Computer Science, 2018)
      An econometric study is carried out using a panel data model with fixed effects to identify the industrial development determinants in Colombia during the term 2005–2015. The database used in the study corresponds to World ...
    • Economic and environmental multiobjective optimization of a wind–solar–fuel cell hybrid energy system in the colombian caribbean region 

      Guillermo, Valencia; Benavides, Aldair; Cárdenas, Yulineth (Energies, 2019-05-15)
      A hybrid system was analyzed and optimized to produce electric energy in non-interconnected zones in the Colombian Caribbean region, contributing to the reduction of greenhouse gas emissions and the improvement in efficient ...
    • Economic costs of chikungunya virus in Colombia 

      Alvis Zakzuk, Nelson Jose; Díaz Jiménez, Diana; Castillo Rodríguez, Liliana; Castañeda Orjuela, Carlos Andres; Paternina Caicedo, Angel Jose; Pinzón Redondo, Hernando Samuel; Carrasquilla Sotomayor, María; Alvis Guzman, Nelson Rafae; De La Hoz Restrepo, Fernando (Universidad de la Costa, 2018)
      Objective: The aim of the present study was to estimate the economic impact of chikungunya virus (CHIKV) infection in Colombia from a societal perspective. Methods: We conducted a retrospective, bottom-up cost-of-illness ...
    • Economic impact of infections and antibiotics 

      Alvis Guzman, Nelson Rafael; De La Hoz Restrepo, Fernando; Pinzón Redondo, Hernando Samuel (Sepsis, tercera edición, 2017)
      In this chapter, we review several aspects with respect to the burden of infectious diseases, its impact in morbidity and mortality, and its economic burden. Furthermore, we referenced the actual situation with relation ...
    • El efecto condicional indirecto de la expectativa de rendimiento en el uso de Facebook, Google+, Instagram y Twitter por jóvenes 

      Arcila Calderón, Carlos; Lopez Ponce, Marcela; Peña, Jennie R. (Revista Latina de Comunicacion Social, 2017)
      Introduction: Previous studies have found a strong relationship between the degree to which individuals believe a technology helps to gain performance (performance expectancy) and the use of that technology. However, there ...
    • Efectos alelopáticos de extractos acuosos de las leguminosas crotalaria [Crotalaria juncea (L.) 'Tropic Sun'], canavalia [Canavalia ensiformis (L.)] y gandul [Cajanus cajan (L.) 'Lázaro'] en el desarrollo de los cultivos 

      Martinez Mera, Eliana Andrea; Valencia, Elide; Cuevas, Hugo E. (Journal of Agriculture of the University of Puerto Rico, 2016)
      En el laboratorio se evaluaron los efectos alelopáticos de extractos acuosos 3.3% m/v de crotalaria [Crotalaria júncea(L.) 'Tropic Sun'], canavalia [Canavalia ensiformis (L.)] y gandul [Cajanus cajan (L.) 'Lázaro'] en ...
    • Effect of different combat jet manoeuvres in the psychophysiological response of professional pilots 

      Hormeño-Holgadoa, Alberto J.; Clemente-Suárez, Vicente J. (Universidad de la Costa, 2019-05-23)
      Extreme limits of the human body could be reached in air combat. We analysed 29 fighter pilots before and after offensive and defensive manoeuvres on heart rate (HR), heart rate variability, leg and hand strength, spirometry, ...
    • Effect of experience and psychophysiological modification by combat stress in soldier’s memory 

      Delgado-Moreno, Rosa; Robles-Pérez, José Juan; Aznar-Laín, Susana; Clemente-Suárez, Vicente Javier (Universidad de la Costa, 2019-03-27)
      The present research aimed to analyze the effect of experience and psychophysiological modification by combat stress in soldier’s memory in a simulated combat situation. Variables of rate of perceived exertion, blood ...
    • Effect of experience, equipment and fire actions in psychophysiological response and memory of soldiers in actual underground operations 

      Tornero Aguilera, José Francisco; Clemente Suárez, Vicente Javier (International Journal of Psychophysiology, 2018)
      The present study aimed to analyze the effect of underground operations on the psychophysiological and memory response of soldiers taking into consideration experience, the use of nocturne vision systems and previous combat ...
    • Effect of temperature in bursting of thalamic reticular cells 

      Hernandez Bustos, Oscar Emilio; E. Zurek, Eduardo; Vera Mellao, David; Cepeda Emiliani, Alfonso (Salud Uninorte, 2018)
      Objective: To show the relation between the four parameters associated to bursting discharges of the thalamic reticular cells (TRNn): the maximum firing frequency (fmax) and the temperature at which it occurs (Tfmax), ...
    • Effect of the Board of Directors on Firm Performance 

      Moreno Gomez, Jorge Isaac; Lagos Cortés, Diógenes; Gómez Betancourt, Gonzalo (Serials Publications, 2017-05)
      This paper aims to study the relationship between three characteristics of the Board of Directors (Board Size, Independent Members, and Number of Meetings) and performance (ROA, ROE) in Colombian firms during the 2008-2014 ...
    • Effect of Vitamin A, Zinc and multivitamin supplementation on the nutritional status and retinol serum values in school-age children 

      Carrero, Carmen; Leal, Jorymar Y.; Ortega, Pablo A.; Parody, Alexander; Montilla, Marilyn; Sierra, Leandro; Viloria Silva, Amelec Jesus; Crissien Borrero, Tito José; Varela Izquierdo, Noel (Lecture Notes in Computer Science, 2018)
      Micronutrient deficiency or “Hidden Hunger” represents the most widespread form of malnutrition in the world. The aim of this study was to evaluate the effect of supplementation with Vitamin A as a single dose, Zinc and ...
    • Effective demagnetizing tensors in arrays of magnetic nanopillars 

      Mendoza Zelis, P; Vega, Víctor V; Prida, V M; Costa Arzuza, Luis Carlos; Beron, Fanny; Pirota, Kleber Roberto; Lopez Ruiz, Roman; Sanchez, Francisco Homero (Physical Review B, 2017-11-21)
      A model describing the effect of magnetic dipolar interactions on the susceptibility of magnetic nanopillars is presented. It is an extension of a recently reported model for three-dimensional randomlike dispersions of ...
    • Effectiveness and costs of conventional dmard therapy in patients with rheumatoid arthritis 

      Santos-Moreno, P; Buitrago-Garcia, D; Villarreal, L; Alvis-Zakzuk, N; Carrasquilla, M; Alvis Guzman, N (Value in health 21, 2018)
      Objectives Biological therapy for rheumatoid arthritis (RA) is still associated with high costs and has impacted the budget in the Colombian Health System in the last decade. We aimed to describe the costs and the ...
    • Effectiveness of an applied high intensity interval training as a specific operative training 

      Curiel-Regueros, Agustín; Fernández-Lucas, Jesús; Clemente-Suárez, Vicente Javier (Physiology and Behavior, 2019-01-11)
      The psychophysiological response due to stress of soldiers in actual combat operations have been determined by recent researchers, but there is a lack of knowledge about the most effective training methodologies to prepare ...
    • Effectiveness of paraffiscal contributions as an investment strategy in social security 

      Villasmil Molero, Milagros; Romero, Francisco Javier; Chivetta, Luz Elena Dovales; Palacios, Alexis (Espacios, 2018)
      The objective of this article was to evaluate the effectiveness of parafiscal contributions as an investment strategy for social security. Theoretically it was based on Rodríguez (2012), Villegas (2005), Brito (2011), among ...