Revista Politechnê: Envíos recientes

Mostrando ítems 161-180 de 302

    • Vertebral arteries 

      Stewart Torres, Alvin; Lutz, Robert J. (Polytechnic University of Puerto Rico, 1998-06)
      During the investigation period, which lasted almost four months, we made a research of the vertebral arteries in the posterior part of the head in children. During this time we investigated the size, diameter and the blood ...

    • Nonoccupational noise exposures and their hazards: a literature review 

      Pesante Santana, José A. (Polytechnic University of Puerto Rico, 1998-06)
      Noise pollution has been extensively studied during the last 30 years. Although most of the government regulations protect the vast majority of the workforce in the in the United States, they fail to consider the workers' ...

    • Low-volume speech 

      Sánchez, Armando (Polytechnic University of Puerto Rico, 1998-06)
      This project is the outcome of the necessity of a female patient of Parkinson's disorder and hearing disability of having someone to tell her to speak louder when her voice level could not be heard. The idea was to build ...

    • Un universo de radiación 

      Iriarte, Modesto (Polytechnic University of Puerto Rico, 1998-06)
      During the last two decades there has been an increase in the worrines of the people regarding the proliferation of electromagnetic fields and their effects on the human body. In this article we explain the basic principles ...

    • Group technology and cellular manufacturing systems: an introduction 

      Cedeño, Angel A. (Polytechnic University of Puerto Rico, 1997-12)
      Global market competition is changing the nature of the present and future marketplace to a highly dynamic environment. Product variety is high and individual product demands are low. Also, customer's demand for faster ...

    • Design and implementation of a virtual keyboard to aid handicapped people to use computers 

      Pérez García, Julio A.; Reilova Barletta, Rafael (Polytechnic University of Puerto Rico, 1997-12)
      This article describes our Capstone Design Project. The project requirements were to design and implement an interface software, to create a virtual keyboard on screen, optimized for typing Spanish language, controlled by ...

    • Strain gauge and micrometer instrumentation of a truss structure 

      Amado González, Vanessa; Ortiz Marti, Luis A.; Batista Soto, Julian; Peña Rosado, Edwin; Tito Izquierdo, Jorge A.; Collazos Ordóñez, Omaira M. (Polytechnic University of Puerto Rico, 1997-12)
      This project was performed as part of the Structural Analysis courses in order to compare theoretical results of the response of simple structures with the experimental results obtained at the Structures Engineering ...

    • Dynamic analysis of rigid pavements and bridges under moving vibrating trucks 

      Rodríguez Agrait, Leandro; Tito Izquierdo, Jorge A.; López Rodríguez, Ricardo R. (Polytechnic University of Puerto Rico, 1997-12)
      The computer program UPR-PAVI2 was developed to perform the dynamic analysis of a pavement slab or a bridge superstructure loaded with moving vibrating trucks. UPR-PAVI2 can model the soil, slab and truck, considering their ...

    • Architects and engineers: What makes the difference? 

      Vélez Delgado, Gilberto A. (Polytechnic University of Puerto Rico, 1997-12)
      The historic dispute between architects and engineers, particularly civil engineers, is nonsense. Both professions are prestigious and dedicate themselves to covering separate and distinct aspects of the design of buildings ...

    • Experiencia con el proceso de mejoramiento de la calidad en una empresa manufacturera 

      Márquez, Manuel (Polytechnic University of Puerto Rico, 1997-06)
      The successful implementation of a continuous quality improvement process in a manufacturing enterprise requires that certain vital conditions are present. It is also essential that those conditions be fully developed ...

    • Use of genetic algorithms in experimental design optimization and thermal property estimation 

      García, Sandrine (Polytechnic University of Puerto Rico, 1997-06)
      The goal of this paper is both to introduce the fields of experimental design optimization and thermal property estimation and to present Genetic Algorithm (GA) optimization method to the faculty of PUPR. This research ...

    • Classification of nr-graphs 

      Sarmiento, Jorge (Polytechnic University of Puerto Rico, 1997-06)
      When all possible r-gons are inscribed in an n-gon, the resulting n-graph falls into one of the following three categories: s-regular (sr or strongly regular), //-regular, or regular (k-regular). The definitions and necessary ...

    • Golden section search solution of single variable optimization problems using MathCad 

      Veras, Eduardo J. (Polytechnic University of Puerto Rico, 1997-06)
      The method of solution presented in this article is based on a searching technique known as the Golden Section Rule. This method can be used for solving single-variable optimization problems without constraints, but for ...

    • Disposición adecuada de desperdicios 

      Vélez Delgado, Gilberto A. (Polytechnic University of Puerto Rico, 1997-06)
      En abril la Autoridad de Desperdicios Solidos celebro el mes de reciclaje y manejo adecuado de los residuos solidos. En mayo se celebro en Puerto Rico la semana del ingeniero y el agrimensor. Posiblemente se estaran ...

    • Colapso de un muro de contención construido con mampostería 

      Díaz Vázquez, Clariluz; Tito Izquierdo, Jorge A. (Polytechnic University of Puerto Rico, 1997-06)
      This study presents the analysis of a masonry retaining wall, typically built in Puerto Rico to stabilize and retain slopes. How safe and well built are these walls?. Have they the adequate resistance to efficiently retain ...

    • Bridges under dynamic loads: comparison between finite element analysis and experimental results 

      Tito Izquierdo, Jorge A.; Rodríguez Agrait, Leandro (Polytechnic University of Puerto Rico, 1997-06)
      AASHO Road Test performed experimental tests on bridges under dynamic and static truck loads. This paper shows a comparison between AASHO's tests and the analytical results of UPR-PAVI2, a computer program developed by the ...

    • Study of the density of states in amorphous Silicon-Hydrogen using the semiconductor/electrolyte system 

      Muñoz, William (Polytechnic University of Puerto Rico, 1996-12)
      Localized states in amorphous Silicon-Hydrogen are studied by pulsed measurements on the a-Si:H/electrolyte (S/E) system. The S/E interface is essentially blocking to current flow. As a result, surface space-charge layers, ...

    • Sizing a solar cell array for a solar powered lawnmower machine 

      Veras, Eduardo J. (Polytechnic University of Puerto Rico, 1996-12)
      This project focuses on the sizing and control of a photovoltaic (PV) collector of a solar lawnmower prototype to satisfy the geographical orientation of Puerto Rico and its available sunlight. The design, analysis and ...

    • Vector quantization 

      Hernández De Luna, Julio A. (Polytechnic University of Puerto Rico, 1996-12)
      Data compression is the packing of data, the process of transforming a body data into a smaller representation from which the original or an approximation of the original can be computed at a later time. Most data sources ...

    • Implementation of the stiffness method within MathCad numeric computation environment 

      Pacheco Crosetti, Gustavo E. (Polytechnic University of Puerto Rico, 1996-12)
      This article presents a case study of a simple planar framed structure to show an original implementation of the stiffness method of structural analysis within MathCad numeric computation environment. This approach was ...