REVISTACIENTIFICA TECNIA Indizada a LATINDEX Julio – Diciembre 2006, VOL. 16 N° 2 CONTENIDOOptimización e implementación de un sistema reconocedor de rostrosJORGE ALBERTO DEL CARPIO SALINAS, JOSÉ ANTONIO HUAMÁN LAYMEEstimación de la irradiancia solar total extraterrestre en función del número de manchas solaresEDSON PLASENCIA SÁNCHEZ, ADOLFO POSADAS, CARLOS CABRERAPredicción de la densidad de gases naturales usando las ecuaciones de estado de Soave-Redlich-Kwong,Peng-Robinson y AG8-DC92JACK ZAVALETA ORTIZ, ALEX PILCO NÚÑEZ, SERGIO VILLANUEVA GUZMANPreparación y caracterización superficial de electrodos de espinela de cobalto dopados con cobre, CUXCO3-X O4, 0 ≤ X ≤ 1.5A. LA ROSA TORO, R. BERENGER, C. QUIJADA, F. MONTILLA, E. MORALLON, L VASQUEZEscala de actitud hacia la investigación, estudiantes y carreras profesionales de ingeniería y ciencias de laUNILUIS E. HUAMANCHUMO DE LA CUBADiseño y simulación de un circuito integrado para el control de un motor PAP utilizando programaciónVHDLDarío Utrilla SalazarModelamiento de los parámetros de funcionamiento de la turbina hidráulica de flujo cruzado aplicando elmétodo de elementos finitosSALOME GONZALES CHÁVEZ, ROMMEL BENJAMIN COTALLAPA VERADiseño y construcción de una aerogenerador de 500 W con imanes permanentes para pequeñas demandaseléctricas de zonas ruralesSALOMÉ GONZÁLES CHÁVEZ, JOSÉ CHIROQUE BALDERA TEODOROEstudio de la resistencia del álabe de una turbina a gas para aviónUBALDO YANCACHAJLLA TITODesarrollo de un programa de cálculo térmico de un motor gasodiesel con formación interna de la mezclaaire gas y validación mediante comparación con resultados experimentalesARTURO MAZA RUBINA, LUIS LASTRA ESPINOZA
TECNIA 2006 VOL 16 Nº 2 JULIO –DICIEMBRE OPTIMIZATIONS AND IMPLEMENTATION OF A SYSTEM RECOGNITION OF FACES ABSTRACTThe Security systems controlled by characteristics of biométrico type as opposed to experience an increasinginterest traditional alternative. This success must to a great extent to that, when a person tries to accede toa system, the decision is taken on the basis of specific characteristics of that person, and on the basis ofwhich does not know or which has (Magnetic cards, key, etc..); In the last years the great development of theinformation systems together with the reduction in price and masificación of computers and censors hascaused an increasing interest by systems that allow to establish the identity of an individual in automatedform. As opposed to this, in this work a recognition of faces is described and implemented using the mostsuccessful techniques in the field of the biometry based on methods Statistical as they are: Decompositionsof the type Eingenface and Hidden Model of Markov Embedded (HMME). The first method generates linear arepresentation reduced of the images of faces so that each face is projected in a space reduced where therecognition was carried out. The second method generates a model of states, based on the correspondencebetween sequence of observation and sequences of states. For it use a data base of faces with students ofthe UNI, a camera, card digitizer and was developed software in C++.Key words.- Statistical data base, Biometry, Camera, Sensors, Eigenfaces, Statistical methods, Model ofmarkov. ESTIMATION OF THE EXTRATERRESTRIAL TOTAL SOLAR IRRADIANCE IN FUNCTION OF NUMBER OF SUNSPOTS ABSTRACTThe Total Solar Irradiance (TSI) is the total amount of solar energy present per square unit every momentbeyond the atmosphere, so, it’s changing every time along the year, although for many practical purposes itsaverage is taken and has been called : The Solar Constant (1367 W/m 2). In this paper, the historical effortsmade to quantificate the TSI are reviewed, the latest advances in this matter are presented and a newmethod to calculate its monthly average based on the SunSpot Number is proposed to approach to its valueas close as 0.05 W/m2 ( RMS = 0.002 ).Key Words.- Solar irradiance, SunSpot number, Solar energy. PREDICTION OF NATURAL GAS DENSITIES USING EQUATIONS OF STATE OF SOAVE-REDLICH-KWONG, PENG-ROBINSON AND AGA8-DC92 ABSTRACTIn this work the Soave-Redlich-Kwong (SRK), Peng-Robinson (PR), and AGA8-DC92 (AGA) equations ofstate have been used to predict the density of different natural gas mixtures. As a result, SRK and PR arestrongly recommended for temperatures within the range 240-350 K. As for the pressure, SRK yielded betterresults within the range 1-8 MPa, whereas PR was more accurate for pressures ranging from 1 to 15 MPa. Theerrors obtained were smaller than 3% for all the 613 experimental points taken from the literature, which isconvenient due to the fact that AGA is not easy to handle. Nevertheless, AGA displayed the best performancein every calculation and proved to be superior to either SRK or PR in the whole range of conditions used inthis investigation. Finally, a computational tool has been developed to calculate density ( ) and
compressibility factor ( Z ). Such a tool incorporates an experimental database of for different gas naturalmixtures.Keywords.- Natural gas, Equation of state, Compressibility factor, Density. PREPARATION AND SUPERFICIAL CHARACTERIZATION OF DRUGGED COBALT SPINEL ELECTRODES WITH COPPER, CUXCO3-XO4, 0 ≤ X ≤ 1.5 ABSTRATCobalt oxide (Co3O4) and copper-doped cobalt oxide (CuxCo3-xO4) films supported on titanium have beenprepared by the thermal decomposition method. The electrodes have been characterized by differenttechniques like scanning Electron Microscopy (SEM), cyclic voltammetry (CV), and X-Ray photoelectronspectroscopy (XPS). The XPS spectra correspond to a characteristic monophasic Cu-Co spinel oxides when x isbelow 1. However, when the copper content exceeds that for the stoichiometric CuCo2O4 spinel, a new CuOphase segregates at the surface. The analysis of the surface cation distribution in spinel structure indicatesthat Cu(II) cation are preferently located in octahedral sites of higher electrochemical activity.Keywords.-Cobaltspinel,Co3O4 electrode, Surface characterization. ATTITUDES TOWARD RESEARCH SCALE, STUDENTS AND ENGINEERING PROFESSIONS AND SCIENCES AT UNI ABSTRACTAn understanding of attitudes is important to help teachers facilitate the learning of research for theirstudents, by enabling them to create more positive attitudes toward research. The fact shows that attitudestoward research scales in students of Engineering Professions and Sciences at Universidad Nacional deIngenieria are multidimensional in nature. They are based on three factors that explain 49.2% of total inertia:(1) Life relevancy of research to the Society and students’ daily lives, (2) Institutional environment, and (3)Modeling and statistical data analysis. The sample of the study consisted of 382 students. It was necessarydeveloped tools of gathering data on latent structures.Key words.- Principal components analysis (PCA), VARIMAX rotation, Cronbach´s alpha. DESIGN AND SIMULATION OF INTEGRATED CIRCUIT FOR CONTROL OF MOTORS PAP, WITH VHDL PROGRAMATION VHDL ABSTRACTIn the present report the design of an integrated circuit is described developed to control motors step by step(PAP), by means of a device FPGA, obtained by means of programming VHDL and techniques of advanceddigital design, In the first place the basic characteristics of the motors appear step by step, soon the madeprocedures, beginning by the description of the surroundings of used control. Next, one step by step details tothe design of the integrated circuit for the control of the motor and its implementation in a FPGA throughtools of advanced digital design. Finally they are to the obtained simulations of the design showing hisoperation.Key words.- Digital design, FPGA, VHDL.
MODELLING OF CROSS FLOW HYDRAULIC TURBINE PARAMETERS APPLICATION USED THE FINITE ELEMENT METHOD ABSTRACTWe shown a Computing Fluid Dynamics (CFD) application using the Finite Element Method (FEM) for themodeling of a 50 kW (Q = 120 l/s, H = 50 m y = 124.6055 rad/s) Cross Flow Hydraulic Turbine, trying toexplain with the numeric methodology the principles and supposes of the classic turbine design and theoptimization. The results are pressure and velocity fields for different operation conditions (Q = 0 – 203.61l/s, H = 9.40 – 580.71 m y = 25, 50, 100 and 125 rad/s) and different regimens (laminar, transition andturbulent), we use this results to estimate some operation parameters (velocity distribution on the inlet flowto the runner, nozzle efficiency and nozzle coefficient, 50 kW turbine characteristics curves and unity turbinecharacteristics curves). Finally we assess the turbine operation parameters for the design conditionsconsidering the flow modeling.Key words.- Hydraulic turbine, Cross flow, Michell – Banki, Flow modeling, Supply nozzle, Runner, CFD, FEM. DESIGN AND CONSTRUCTION OF WIND TURBINE 500 W WITH PERMANENT MAGNET GENERATOR FOR SMALL ELECTRIC DEMANDS OF RURAL AREAS ABSTRACTThe present work is about the design, construction and characterization of Wind Turbine 500 W prototype,using national technology; it is the design and production of the wind turbine components - permanentmagnet generator, rotor and auxiliary elements-, as well as the performance evaluation in field. The WindTurbine 500 W application will be an energetic and socioeconomic solution of the rural areas with windresources. With field tests results we carry out the verification of design conditions, as well as the operationof wind turbine according to wind resource. Although the system was designed for 500 Watts nominal powerand 8 m/s wind speed, in field this power has been obtained to 8,3 m/s wind speed, and a stable behaviorunder the other conditionsKey words.- Wind turbine, Permanent magnet, Rural areas, Socioeconomic, Clean energy. TUDY OF THE STRENGTH OF THE BLADE OF AIRCRAFT TURBINE ABSTRACTThe work consists of demonstrating the possible utilization of the methods of the finite elements for thecase of calculation of a blade of a turbine of plane by the method of the finite elements, first we find thecritical stress in the blade due to the solicitations of the centrifugal force and the gas-dynamics, thesegenerate stress of traction and flexion principally. Comparing these results with the obtained ones previouslyfor traditional methods, managing to validate our results for the method of the finite elements. Finally wewill find the manners of vibrating and natural frequencies of the blade of the turbine, coming to conclusionsthat they reconcile to the published ones in the literature. The method of the finite elements represents apowerful tool that can be used satisfactorily for the optimization of the such complex designs as of theturbine.Key words: Blade, Strain, Turbine, Stress, Vibration.
DEVELOPING OF THE THERMAL CALCULATION OF THE GASODIESEL ENGINE WITH INTERNAL FORMATION OF THE MIX AIR GAS AND VALIDATION BY THE EXPERIMENTATION ABSTRACT The present work treats, on the performance of a mathematical model of simulation of the different processes that take place in the motors, which allow to establish the foreseeable indices of the cycle of operation of a motor of internal combustion of type gasodiesel, the methods of simulation of the operational cycle used in this work have been taken from recognized authors Soviet. This I calculate thermal fundamental has been made having in account that the combustible mixture this composing of GLP D2 in proportions of 40% and 60% respectively, whereas the GLP this compound of 50% of propano and 50% of Butane, to obtain the operation characteristics, has been developed a computacional program denominated Ajesa2004. The method of GLP provision is through the line of high pressure, which is made due to the hydrodynamic phenomena type water hammer which they are originated in this line, when the propelling valve, during the unloading of the provision of fuel when falling in its seat due to its belt of unloading forms a rarefaction wave; this wave makes open the valve of denominated retention RND. We made the grafico comparative analysis for whichthe obtained experimental values in the proving stand have been taken Newage, mounted with a diesel enginesupercharged Perkins, such which they are necessary to optimize the indicated diagram and the characteristicsof load and speed, obtained by means of a computacional program, table 1 y 2. Key words.- Performance, Simulation, Pressure, Water hammer, Propelling, Valve, Engine, supercharged .