Revista Politechnê: Recent submissions

Anzeige der Dokumente 181-200 von 302

    • Determination of soil strength parameters from unconfined compression testing on partially saturated soils 

      Martínez Gómez, José Alfredo (Polytechnic University of Puerto Rico, 1996-12)
      The uneonfined compression test is used in most geotechnical studies to y -determine soil strength parameters. This test is recommended for fine cohesive > ^ soils with a degree of saturation of more than 90%. It has been ...

    • Design and analysis of multi-section eccentric shaft 

      Resto, Javier (Polytechnic University of Puerto Rico, 1996-12)
      In this report the preliminary design and analysis of multi-section eccentric shaft to be used on four-rotor Wankel rotary engine is discussed. Only a static analysis was performed due to time constraints. This novel design ...

    • Inscribed r-gons: A Combinatorial approach 

      Sarmiento, Jorge (Polytechnic University of Puerto Rico, 1996-12)
      The author uses the concept of circular combinations to find the number of r-gons that can be inscribed in a n-gon.

    • Trigésimo Aniversario 

      Vélez Delgado, Gilberto A. (Polytechnic University of Puerto Rico, 1996-12)
      La Universidad Politécnica de Puerto Rico (UPPR) cumple 30 años. Nació en 1966 cuando comenzó a ofrecer cursos técnicos conduncentes a un bachillerato en agrimensura y cartografía.

    • Determination of interface roughness and its correlation in amorphous-silicon/ amorphous-germanium multilayers 

      Pantojas, Víctor M. (Polytechnic University of Puerto Rico, 1996-06)
      The importance of surfaces and interfaces of materials is increasing in many technological areas. In the microelectronic industry, for example, the J current trend is toward even faster and smaller electronic devices. ...

    • Perspectivas futuras de la demanda energética mundial: el enfoque social de un problema global 

      Nieves Ortega, Carlos I. (Polytechnic University of Puerto Rico, 1996-06)
      Future perspectives of the energy demand of the world: social focusing of a global problem This article attempts explaining the short- and long-range perspectives of energy consumption as a function of social factors such ...

    • Variables that may predict the behavior of a student in his/her university life at Polytechnic University of Puerto Rico 

      Vélez Delgado, Gilberto A.; Vega, Rolando (Polytechnic University of Puerto Rico, 1996-06)
      The objective of this study is to establish the relationship, if any. between the Graduation Grade Point Average (GPA) of students that began as first year studentes at Polytechnic University of Puerto Rico and remained ...

    • Process control laboratory - bar code system 

      Rodríguez, María de Lourdes (Polytechnic University of Puerto Rico, 1996-06)
      This paper presents the basic concepts of a bar code system using a PC-based architecture. This system was developed and implemented in the Industrial Engineering Process Control Laboratory. The main objective of this ...

    • Reduction of downtime through the design of TPM and the implementation of some techniques of SMED system at high speed packaging lines 

      López López, Dorcas Y.; Calo Ortiz, Ralfy; Pérez Carrión, Edwin G.; Marrero Laboy, José J. (Polytechnic University of Puerto Rico, 1996-06)
      This project was developed at a pharmaceutical facility located in the eastern area of Puerto Rico. The company manufactures oral contraceptives and analgesics. In the analgesic branch a new product is being introduced, ...

    • Pull system implementation in a welding area 

      de Ia Mata, Milagros; González Torres, Daniel E. (Polytechnic University of Puerto Rico, 1996-06)
      Our project took place in a welding area which supplies two production lines of a large company in Puerto Rico. The company is divided in four areas: fabrication, welding, assembly and molding. Management wants to implement ...

    • Configuraciones proyectivas ortomodulares y retículos cúbicos 

      Sarmiento, Jorge (Polytechnic University of Puerto Rico, 1995-12)
      Orthomodular projective configurations and cubic lattices The author shows the construction of a cubic, connected, orthomodular attice of height 3, from a connected, orthomodular, projective configuration and gives the ...

    • Design of an automatically guided mechanical manipulator 

      Veras, Eduardo J. (Polytechnic University of Puerto Rico, 1995-12)
      An automatically guided mechanical manipulator is an electromechanical « device used for transportation and material handling. A combination of k electronics control and mechanics (mechatronics) design and analysis is » ...

    • Diseño de un experimento para una máquina de embotellado 

      Muñoz Cabán, Carmen; Vázquez Soto, Guillermo A. (Polytechnic University of Puerto Rico, 1995-12)
      Experimental design for a bottling proccess machine In this article we present an experimental design for a bottling process machine of the dry products plant of a local pharmaceutical industry. Our goal is to identify ...

    • Diseño de un motor sincrónico y su sistema de protección 

      Del Río Mora, Ángel (Polytechnic University of Puerto Rico, 1995-12)
      Design of a synchronous motor and its protection system The design of a synchronous motor is not a common task in the practice of electrical engineering because this type of machine is widely available for mechanical ...

    • Subscriber line automatic identification number device 

      Lozada, Roberto; Sánchez, Pedro A. (Polytechnic University of Puerto Rico, 1995-12)
      The subscriber line automatic identification number device, SLAIN device, is an apparatus that may be utilized as the subscriber's end section of a telephone privatization system. This system will not utilize any equipment ...

    • Electrical distribution system for the Cantera Península Community (Santa Elena and Condadito Final sectors) 

      Bernard, Félix; León, Carlos; Lizardi, Franz; Ortiz, José A.; Santiago, José O. (Polytechnic University of Puerto Rico, 1995-12)
      The primary objective of this project is improving the quality of life of the Peninsula de Cantera residents. Our collaboration in this improvement deals with infrastructure, specifically with the electric power service. ...

    • Programa para construir la matriz representativa de un sistema de potencia eléctrica 

      Santiago Quiles, Víctor E.; Velázquez Vázquez, Luis (Polytechnic University of Puerto Rico, 1995-06)
      Computer program to build and modify an electrical power system matrix A power systems engineer has to build and modify the electrical power system matrix every time elements of the system are added, deleted or modified. ...

    • Cálculo de los coeficientes de la ecuación de pérdidas para un sistema de generación de potencia 

      Ruiz, Fernando; Santos, José A. (Polytechnic University of Puerto Rico, 1995-06)
      Calculation of the loss equation coefficients (Bmn) for a power generation system Engineering has been very successful in the analysis of fuel costs, performance and efficiency of boilers, turbines, and generators. However, ...

    • Programa de computadora para diseñar mallas puestas a tierra en las subestaciones de potencia 

      Ramírez Zeno, Pedro I.; Sierra, José L. (Polytechnic University of Puerto Rico, 1995-06)
      Computer program to design grounding grids for power subtations As of today, the Puerto Rico Electric Power Authority (PREP A) does not have a modem computer program based on the latest technology to design and analyze ...

    • Simulación de fallas en sistemas de potencia usando componentes simétricos y el programa PSPICE 

      García Correa, Horacio A.; Rivera Velázquez, Vicente (Polytechnic University of Puerto Rico, 1995-06)
      Fault simulation in power systems using symetric components and the computer program PSPICE This article shows how to use the computer program PSPICE to analyze faults in power systems by the symmetrical components method. ...