Correo Electrónico
DNINFOA - SIA
Bibliotecas
Convocatorias
Identidad U.N.
Browsing Dyna by Title
Now showing items 1598-1617 of 1620
-
Vigas de madera laminada Glulam reforzadas con pletinas metálicas dentadas
En este artículo se estudian las propiedades mecánicas de vigas de madera laminada Glulam reforzadas con pletinas metálicas dentadas. Se fabricaron y analizaron experimentalmente 2 grupos de vigas: 30 vigas de madera ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Vinasse treatment by coupling of electro-dissolution, heterocoagulation and anaerobic digestion
The distillery vinasse is the most important liquid effluent of the ethanol production process and it is characterized by a high chemical oxygen demand (COD) and high biochemical oxygen demand (BOD); besides its acid pH ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Viscoelastic behavior of yellow pitahaya treated with 1-MCP
Foods may have both solid and liquid properties, and are described as viscoelastic products. Knowledge on such viscoelastic features is very useful for quality control and/or food stability. The purpose of this work was ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Viscosity and viscometric properties of glycine in aqueous solutions of sodium thiosulfate pentahydrate (na2s2o3 .5h2o) at different temperatures
Flowing times of Glycine in aqueous solutions Sodium Thiosulfate Pentahydrate (0.01-2.0 mol kg-1) using an AMVn Anton Paar viscometer at temperatures of (283.15; 288.15; 293.15; 298.15; 303.15; 308.15, 313.15 and 318.15) ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
-
Voltage Regulation in a Power Inverter Using a Quasi-Sliding Control Technique
This paper shows the behavior of a three-phase power converter with resistive load using a quasi-sliding and a chaos control techniques for output voltage regulation. Controller is designed using Zero Average Dynamic (ZAD) ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Voltage sag assessment using an extended fault positions method and Monte Carlo simulation
In this article, we propose an extended fault positions method combined with the Monte Carlo method to evaluate voltage sags. The distribution function SARFI is obtained by taking into account the randomness of (i) location ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Voltage stability analysis taking into account a shunt connected device based on power electronics
In this paper the power system voltage stability problem is analyzed with active power–voltage (PV) curves, as a voltage compensator is introduced. The PV curves’ shape has been a subject of great concern, especially when ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Vulnerability Assessment of Power Systems to Intentional Attacks using a Specialized Genetic Algorithm
A specialized genetic algorithm applied to the solution of the electric grid interdiction problem is presented in this paper. This problem consists in the interaction of a disruptive agent who aims at maximizing damage of ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Water quality index based on fuzzy logic applied to the aburra river basin in the jurisdiction of the metropolitan area
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
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
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
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
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
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
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
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
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
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
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.
