Now showing items 21-40 of 276

    • 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 ...
    • 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 ...
    • 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 ...
    • Compendio sobre diseño de plantas de tratamiento de aguas negras 

      Tejada Ríos, Pedro J. (Polytechnic University of Puerto Rico, 1993-06)
      This article presents the essential considerations for designing wastewater treatment plants. It also introduces a computer program to design wastewater treatment plants. The author used Basic to develop this program, which ...
    • Coeficientes de utilización de disyuntores ("breaker duty") 

      Orama Exclusa, Lionel R.; Torres Vincenty, Lygia M. (Polytechnic University of Puerto Rico, 1993-06)
      The breaker duty calculation is very important to the electric industry cause it shows which breakers overload under fault conditions. This way e utility determine the the extra capacity to add to those breakers or Aether ...
    • Desarrollo de un estudio de viabilidad econoniica para la desición de proyectos de ampliación en el servicio de habitaciones del Hotel Cielo Mar 

      Acevedo Sanz, Mayra S.; Barruos Pimentel, Maritza (Polytechnic University of Puerto Rico, 1993-06)
      The western area of the island has experienced an increse in the tourism activity during the past two fiscal years. Evidence of this increase has been recorded at the Hotel Cielo Mar-in Aguadilla, as well as other hotels ...
    • Theory of constraints will really improve your competitiveness 

      Cruz, Rafael (Polytechnic University of Puerto Rico, 1993-06)
      The Theory of Constraints (TOC) is a new management philosophy created by Eliyahu M. Goldratt to help an enterprise reach its goal. To accomplish this objective a company must change the paradigm of costs and follow two ...
    • Diseño de un sistema de producción de discos para pararrayos mediante la simulación computadorizada del proceso 

      Delgado, Jorge J.; Rivera, Francisco J. (Polytechnic University of Puerto Rico, 1993-06)
      This project is based upon proposed changes to the design of facilities and the acquisition of new equipment for a company. Our goal is to optimize the use of the equipment and the human and economic resources using the ...
    • Análisis comparativo de sistema eléctricos 

      Alvarez Alamo, Víctor J. (Polytechnic University of Puerto Rico, 1993-06)
      In this paper we study different alternatives to supply electric power to die die company Eureka Marine Products. The energy alternatives considered in the study are the wind energy, solar energy and the electric power ...
    • Pérdidas de agua en los sistemas fluviales 

      Díaz, Pedro; Quintero, Jorge (Polytechnic University of Puerto Rico, 1993-12)
      In this paper we identify those elements that contribute to the undetermined water losses in the Puerto Rico Water and Sewers Authority. We also provide detailed recommendations to reduce these losses.
    • Banco de pruebas de relés 

      Figueroa, Heriberto (Polytechnic University of Puerto Rico, 1993-12)
      Description of a test bench that simulates the operation of the protection system of a transmission center. The test bench developed integrates several electromagnetic devices, known as relays, that work together to protect ...
    • Theory of operation of today CD systems 

      García, Rafael; Trabanco, Benjamin R. (Polytechnic University of Puerto Rico, 1993-12)
      In this article we examine the main events that lead to the invention of the compact disc or CD, as we all call it. We consider the most important components of the playback section of the CD such as the pick-up circuit, ...
    • The generalized cross-product of vectors 

      Deschapelles, Bernardo (Polytechnic University of Puerto Rico, 1993-12)
      The meaning of the scalar product of two vectors can be easily extended to a space of n dimensions. Similar generalization, related to the cross-product of vectors with more than three components, has not been formulated ...
    • Diseño computadorizado de la carga térmica para el acondicionamiento de aire en Puerto Rico (AIRPAK 123 TM) 

      Tirado, Alberto; López, Félix (Polytechnic University of Puerto Rico, 1993-12)
      A digital program to compute the industrial air conditioned load was designed. It took us over 3,000 hours to obtain a reliable product which excels all air conditioned programming standards known to this moment. The program ...