Revista Técnica de la Facultad de Ingeniería Universidad del Zulia (REV TEC FAC ING UNIV)

Journal description

Publication of the Facultad de Ingeniería, Universidad del Zulia. Mission: Publicar trabajos relacionados con todas las ramas de Ingeniería y las Ciencias Aplicadas.

Current impact factor: 0.05

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 0.047
2012 Impact Factor 0.033
2011 Impact Factor 0.05
2010 Impact Factor 0.04
2009 Impact Factor 0.039

Impact factor over time

Impact factor

Additional details

5-year impact 0.06
Cited half-life 0.00
Immediacy index 0.00
Eigenfactor 0.00
Article influence 0.01
Website Revista Técnica de la Facultad de Ingeniería Universidad del Zulia website
ISSN 0254-0770

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: The paper deals with a model of a switched reluctance motor (SRM) that can be used for the development of control methods for the electrical drives with the SRMs. The non-linear theory describing the behavior of the SRM is listed that uses differential equations including the electromagnetic equations, the electromechanical equations, and the motion equation. On the basis of this theory, there are designed function dependencies of important quantities that are used in the model of the machine. For the verification of the designed model, there was used a control structure using Lyons method that belongs to basic sensorless control methods of the SRM. The sensorless control allows the estimation of the rotor angle and speed. The method is suitable for the area of middle and higher speeds of the SRM. In the paper, there are presented simulation results that show important quantities of the SRM during start and speed reversation.
    Revista Técnica de la Facultad de Ingeniería Universidad del Zulia 04/2015; 38(1):114-126.
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    ABSTRACT: Exploratory data analysis constitutes a challenge for scientists and analysts of multiples disciplines. Most current methods and tools do not allow for analyzing effectively several variables simultaneously. This paper addresses the problem of visual analysis of temporal sequences of multiple variables using multiparameter visualization techniques in geographical information systems. The concepts and methods developed here were implemented as an extension to gvSIG GIS, thus demonstrating the feasibility of this approach for extracting information and knowledge from the original data. A case study with global climate data containing 9 variables with 1224 monthly records from 1901 to 2002 is exposed. Information is given for the 67,420 cells that correspond to the Earth’s land surface, where each cell occupies an area of 25km by 25km. Also, a module for handling scientific data formats was developed for gvSIG that allow storing all information in compact form for effective reading.
    Revista Técnica de la Facultad de Ingeniería Universidad del Zulia 04/2015; 38(1):73-82.
  • Revista Técnica de la Facultad de Ingeniería Universidad del Zulia 12/2014;
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    ABSTRACT: In the present work, an integrated quality analysis process of the lubricating oil used in stationary diesel engines of electric power plants is implemented. This process includes a continuous monitoring of relevant variables through the well-known methodology SACODE with the following modifications: changes in variable limits and evaluation of kinematic viscosity and TBN by using Fuzzy logic. The method of analysis was automated by the implementation of the software SOFTLUB on the MATLAB platform. The uses of SOFTLUB allowed graphing historical results of oil quality parameters, calculating and updating its limits, quality assessment and also predicting future behavior of oil viscosity and TBN, in order to support maintenance decision making in power plants.
    Revista Técnica de la Facultad de Ingeniería Universidad del Zulia 12/2014; 37(3):206 - 212.
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    ABSTRACT: Axial-flow pumps are widely used in many sectors of national economy, and the improvement of their pumping efficiency means the saving of tremendous energy and great contribution to environment protection. The velocity circulation is an important parameter in the design of axial-flow pumps and its distribution features will directly affect the shape of blades and performances. The turbulence model κ - ε is selected to close the time-averaged incompressible three dimensional Navier-Storks equations, and numerical simulation is conducted to analyze the internal flow fields and distribution features of velocity circulation of axial-flow pumps. The simulated results indicate that there exists circulation in entrance section of impeller and at designed flow rate the value of circulation reaches minimum. The circulation in the discharge section of axial-flow impeller varies with the flow rate and radius. The smaller the flow rate and the larger the radius is, the greater the value of velocity circulation. There is residual circulation in the exit section of diffuser, and negative tangential velocity and circulation are found near the hub of diffuser, leaving a big space of optimization design of impeller and guide vanes.
    Revista Técnica de la Facultad de Ingeniería Universidad del Zulia 12/2014; 37(3):14-21.
  • Revista Técnica de la Facultad de Ingeniería Universidad del Zulia 08/2014; 37(2):167-175.
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    ABSTRACT: In the present work, the influence of the degradation during the processing of nanocomposites of poly (lactic acid) (PLA) with montmorillonite and its blends with low density polyethylene as dispersed phase on their morphology and tensile properties was studied. Polymers grafted with maleic anhydride were used as compatibilizer agents. The blends were prepared via melt blending in an internal mixer at 200°C and characterized in terms of solution viscometry of the PLA phase, infrared spectroscopy, and scanning and transmission electron microscopy. Results showed that the processing of PLA produced thermo-mechanical degradation in the polymer and a significant decrease in the viscosity molecular weight of the PLA phase in the different composites. The large sizes of the dispersed phases in the unfilled PLA blends and the low values of the tensile properties could be attributed to the thermo-mechanical degradation of the PLA matrix during its processing. The blends with PLA as matrix and PEBD as dispersed phase exhibited the highest elongation at break. Lower values in tensile properties were obtained in the blend with montmorillonite than those obtained for the blend without the layered clay due probably to the degradation during the processing and also to their morphology.
    Revista Técnica de la Facultad de Ingeniería Universidad del Zulia 08/2014; Vol. 37(2):135-143.
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    ABSTRACT: It can be observed that the number of vehicles, accidents and congestion increase proportionally with the development of a city. A vehicular traffic system behaves like a system of discrete events, and due to variations that affect the level of congestion, modeling and controlling this system becomes a complex task. Petri Nets are one of the most powerful tools for modeling graphically and mathematically. Some systems are characterized by little information, inaccurate data and / or permanent changes with regard to the model of the system, which makes modeling and control difficult. This has led to modeling techniques that apply adaptation techniques and human knowledge representation through bio-inspired computing systems such as Neural Networks and Fuzzy Logic. These techniques will be harnessed in this work in terms of an approximated model for learning in a discrete concurrent system by using Fuzzy Petri Nets to represent knowledge through the application of inference and adaptive rules in a chaotic environment, like it can be found in a traffic system.
    Revista Técnica de la Facultad de Ingeniería Universidad del Zulia 06/2014; 16(1):185.