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Mostrando ítems 21-40 de 2125

    • Análisis de corto circuito considerando cargas 

      Sánchez del Río, Ángel (Polytechnic University of Puerto Rico, 1991-12)
      Short circuit analysis is usually simplified neglecting shunt connections including system loads. If under particular conditions, system loads cannot be neglected, the superposition principle can be used, adding pre-fault ...

    • Sistemas de imágenes utilizando discos ópticos 

      Lozada Sorcia, Louis M.; Santiago, Enrique Luis (Polytechnic University of Puerto Rico, 1991-12)
      This paper defines the concept of imaging technology, the particular hardware needed to support it and the use of the optical disk as the medium for the storage of electronic images. In order to have a better understanding of ...

    • Diseño de un modelo de simulación por computadoras para una sala de emergencias 

      Alejandro, Javier; Delgado Aristud, Ignacio (Polytechnic University of Puerto Rico, 1991-12)
      This document describes the development of a simulation model and its use in the emergency room of a hospital. The first part of the document presents the problem and the system to be modeled, the objectives of the study, ...

    • Programa emulador del microprocesador MC6800 para correrse en sistemas de computadoras personales basadas en procesadores Intel 

      Arroyo Suárez, Juan (Polytechnic University of Puerto Rico, 1991-12)
      This paper presents the development of a program to emulate the Heathkit ET-3400 trainer and the MC6800 microprocessor on an IBM or compatible personal computer. The ET-3400 trainer is the only available tool at the ...

    • Diseño de un controlador de lógica programable 

      Ferrer, Luis A.; Rodríguez, Edilberto (Polytechnic University of Puerto Rico, 1991-12)
      This document shows how to design a programmable logic controller. This type of design involves several steps, but these steps were grouped in two subsequent phases. The first phase deals with the design and implementation of ...

    • Simulación digital para verificación de diseño y sus aplicaciones en el desarrollo de pruebas automatizadas 

      Figueroa, Rafael A.; Jordán, Rodolfo E. (Polytechnic University of Puerto Rico, 1992-06)
      This paper presents the digital simulator as the tool for the computerized analysis of digital logic circuits. Among the topics discussed in the study are the behaviour of digital circuits, the development of vectors to ...

    • Programmable logic controllers: A course in programming and implementation 

      Ortiz, Miguel A. (Polytechnic University of Puerto Rico, 1992-06)
      The purpose of this paper is to provide basic information related to programmable logic controllers (PLCs), their applications and programming. It covers the historical background and an overview of the programmable ...

    • Función para la entrada de datos en programas escritos utilizando el compilador QuickBasic 

      Lebrón González, José R. (Polytechnic University of Puerto Rico, 1992-06)
      This document shows a data entry function written in the QUICKBASIC version of the BASIC computer programming language that can be used for the development of engineering application programs. The function uses many of the ...

    • Wave solder process characterization by an experimental design approach 

      Matos, Javier Enrique; Santos, José Emilio (Polytechnic University of Puerto Rico, 1992-06)
      A manufacturing company in Puerto Rico was interested in evaluating the possibility of profiling all printed circuit board assemblies. Experimental design, a method for systematically planning engineering studies, offered ...

    • An approach in statistical control chart design 

      Rodríguez-Mombille, René (Polytechnic University of Puerto Rico, 1992-06)
      Several questions arise when designing statistical process control charts Is the control chart sensitive enough to detect a particular process shift with a particular frequency? When should a process shift be considered ...

    • Homenaje a una estudiante anónima 

      Rosado Almedina, Maria Gisela (Polytechnic University of Puerto Rico, 1992-06)
      Han transcurrido dos años del suceso que voy a narrar. Se trata de uno de esos recuerdos que atormentan al maestro durante toda su vida porque forma parte de las experiencias que son ejemplo vivo de cómo piensan algunos ...

    • Fallas de alta impedancia en los sistemas de distribución eléctrica 

      Ramos Rodríguez, Ricardo L.; Zapata Acosta, Mary C. (Polytechnic University of Puerto Rico, 1992-06)
      Most of the time, a fault in an electrical power system presents a much higher current than the current that flows in the system during. normal conditions. This fault current is harmful for the components of the system ...

    • Desarrollo del pensamiento crítico 

      Vélez Delgado, Gilberto A. (Polytechnic University of Puerto Rico, 1992-06)
      This article presents the need of every human being to develop the ability to think critically, free of every prejudice induced by the society. The elements of the logic of thought are described. As an example to ...

    • Despacho económico considerando la distribución del margen de reserva en regulación 

      Parés Santiago, Lillivette; Ramírez Varona, Ramon J. (Polytechnic University of Puerto Rico, 1992-12)
      This paper presents the concept of the regulating reserve margin in an economic dispatch by using the Lagrange method of undetermined multipliers. The regulating reserve margin is the amount of generation that should be ...

    • Theory of constraints will really improve your competitiveness 

      Cruz, Rafael (Polytechnic University of Puerto Rico, 1992-12)
      The Theory of Constraints (TOC) is a new management philosophy created by Eliyahu M. Goldratt to help an enterprise reach its goal. In order to accomplish this objective a company must change the paradigm of costs an follow ...

    • Diseño de un marcapaso programable con memoria y capacidad de comunicación 

      Cruz Vivaldi, Eric; Ortiz Burgos, Jorge J. (Polytechnic University of Puerto Rico, 1992-12)
      A design of a programmable pacemaker unit which integrates microprocessor control, memories and a communication device. This pacemaker uses programming techniques to adjust its operations to the patients' needs, to compile ...

    • Dinámica de redes y el modelo del ión rígido en cristales del tipo R2MX6 

      Torres, Dorcas I. (Polytechnic University of Puerto Rico, 1992-12)
      The theory of lattice dynamics in the harmonic approximation and the Born and Huang's rigid-ion model are used to study ionic crystals of R2MX6 type with antifluorite structure. The rigid-ion model expresses the potential ...

    • Filtros digitales para el procesamiento de imágenes 

      López Malavé, Roberto; Rivera Paz, William (Polytechnic University of Puerto Rico, 1992-12)
      The purpose of this paper is to design filters capable of extracting the contours of an image, thus reducing the distortion while processing an image. In order to attain this goal, we developed a group of computer programs ...

    • Estudio de transferencia de calor 

      Díaz, Jossaranny; Ortiz, Samuel (Polytechnic University of Puerto Rico, 1992-12)
      This paper presents a heat transfer study using the heat transfer device TDl of the Polytechnic University of Puerto Rico. In our research we determine the following heat transfer parameters for a system, t e ea transfer ...

    • Programa para verificar la calibracion de un rele de proteccion por impedancia 

      Delgado, Benjamín; Morales, Asdrúbal (Polytechnic University of Puerto Rico, 1992-12)
      This article describes the preparation of a testing file to verify the calibration of an impedance protection relay using the Mastertest program. With this work we present an alternative to the ones now used for relay ...