Now showing items 1-20 of 381

    • New optical filter employing multireflection mirror to provide design flexibility for WDMA 

      Vargas, Salvador; Vázquez, Carmen (1905-06-22)
      A novel optical device employing an amplified ring resonator and a multireflecting mirror inside, is presented. Is founded its transfer function. Also simple expressions for the separation of the two maximums of this novel ...
    • Remoção de íons de metais pesados com bentonitas modificadas 

      Tejedor De León , Alexis; Goulart Nunes, Denise; Rubio, Jorge (1905-06-23)
      O presente trabalho apresenta o desenvolvimento de um material sorvente a partir de bentonitas brasileiras modificadas quimicamente com o objetivo de aumentar sua capacidade de sorção de metais pesados e seu valor agregado. ...
    • Study of The Corrosion Products Formed on Carbon Steels in The Tropical Atmosphere of Panama 

      Jaén, Juan A.; De Villalaz, M. S.; Araque, L.; Hernández, Cecilio; De Bósquez, A. (1905-06-25)
      Mössbauer spectroscopy and X-ray powder diffraction (in selected samples) have been used to characterize corrosion products on carbon steels after atmospheric exposure to the tropical Panamanian locations of Panama and ...
    • Seismic Response of Single-Degree-of-Freedom Systems with Structural Fuses 

      Vargas, Ramiro (1905-06-25)
      Passive energy dissipation (PED) devices have been implemented to enhance structural performance by reducing seismically induced structural damage. In this article, metallic dampers are defined to be structural fuses (SF) ...
    • Investigation of the Structural Fuse Concept 

      Vargas, Ramiro; Bruneau, Michel (1905-06-26)
      Passive energy dissipation (PED devices have been implemented to enhance structural performance by reducing seismically induced structural damage. In this paper metallic dampers are defined to be structural fuses (SF) when ...
    • Robust Cascade Controller for Nonlinearly Actuated Biped Robots: Experimental Evaluation 

      Caballero, Rony; Armada, Manuel; Akinfiev, Teodor (1905-06-26)
      In this paper we consider the postural stability problem for nonlinearly actuated quasi-static biped robots, both with respect to the joint angular positions and also with reference to the gripping effect between the ...
    • Seismic Response of Single-Degree-of-Freedom (SDOF) Structural Fuse Systems 

      Vargas, Ramiro; Bruneau, Michel (1905-06-26)
      Passive energy dissipation (PED) devices have been implemented to enhance structural performance by reducing seismically induced structural damage. In this paper metallic dampers are defined to be structural fuses (SF) ...
    • Floor Response of SDOF Systems with Metallic Structural Fuses 

      Vargas, Ramiro (1905-06-26)
      The floor demands of Single-Degree-of-Freedom (SDOF) systems designed or retrofitted with metallic structural fuses are studied in this article. Floor velocity and acceleration are obtained and comparisons are made between ...
    • Seismic Response of Hybrid Systems with Metallic and Viscous Dampers 

      Vargas, Ramiro (1905-06-27)
      Metallic dampers can enhance structural performance by reducing seismically induced lateral displacements, and by reducing inelastic behavior of beams and columns. Limiting story drift also indirectly allows for mitigation ...
    • On the Design and Development of Climbing and Walking Robots for the Maritime Industries 

      Armada, Manuel; Prieto, M.; Akinfiev, T.; Fernández, Roemi; Montes Franceschi, Héctor (1905-06-27)
      Modern robotic systems are increasingly powerful in terms of sensor fusion and mobility. Present technological progress allows advanced robots to cope progressively much better also with complex environments such as those ...
    • Effectiveness of natural antioxidants in sunflower oil 

      Carelli, Amalia A.; Franco, Indira C.; Crapiste, Guillermo H. (1905-06-27)
      The antioxidant activity of ∝- and δ-tocopherol, citric acid, ascorbic acid and ascorbyl palmitate was investigated in sunflower oil containing naturally occurring tocopherol. The effectiveness of natural antioxidants in ...
    • Geophysical Investigations in the Old Panama Archaeological Site 

      Mojica, Alexis; Acosta, Leomar; Acosta, Leomar; Guérin, Roger; Ho, Carlos A.; Caballero, Orlando (1905-06-28)
      The results of geophysical prospections in an archaeological site of hispanic type in Panama (Central America) are presented in this article. The archaeological site of Old Panama has been intensively investigated with the ...
    • Seismic Design of Multi-story Buildings with Metallic Structural Fuses 

      Vargas, Ramiro; Bruneau, Michel (1905-06-28)
      Seismic design relies on inelastic deformations through hysteretic behavior. However, this translates into damage on structural elements, permanent system deformations following an earthquake, and possibly high cost for ...
    • Reliable, Built-in, High-Accuracy Force Sensing for Legged Robots 

      Montes Franceschi, Héctor; Nabulsi, Samir; Armada, Manuel (1905-06-28)
      An approach for achieving reliable, built-in, high-accuracy force sensing for legged robots is presented, based on direct exploitation of the properties of a robot’s mechanical structure. The proposed methodology relies ...
    • Methodology for Zero-moment Point Experimental Modeling in the Frequency Domain 

      Caballero, Rony; Armada, Manuel; Alarcón, Pedro (1905-06-28)
      Frequency domain methodology is applied to obtain a nominal model for the Zero-Moment Point (ZMP) stability index of a biped robot in an attempt to establish a relationship between the robot trunk trajectories and the ...
    • Analytical Investigation of the Structural Fuse Concept 

      Vargas, Ramiro; Bruneau, Michel (1905-06-28)
      Passive energy devices (PED) are useful to enhance structural performance by reducing seismically induced structural damage. Metallic dampers are one such PED. When they are designed such that all damage is concentrated ...
    • Modèles 2-D MA pour les champs non déterministes et la décomposition de textures de type Wold 

      Merchán, Fernando; Turcu, Flavius; Najim, Mohamed (1905-06-29)
      Nous proposons une nouvelle méthode pour l'estimation de paramètres d'un modèle 2-D MA infini tronqué associé aux champs stationnaires non déterministes. Cette méthode est développée dans le cadre d'approches d'analyse et ...
    • Outer Factor 2-D MA Models for Purely Random Fields and Fields and Wold-Tipe Texture Decompositions 

      Merchán, Fernando; Turcu, Flavius; Najim, Mohamed (1905-06-29)
      In this paper, we propose a new method to compute the parameters of finite approximations of 2-D MA infinite models associated with purely indeterministic stationary fields, by using spectral factorizations. This method ...
    • Towards Simple Interaction in the Classroom: an NFC Approach 

      Nava-Díaz, Salvador W.; Chavira, Gabriel; Hervás, Ramón; Villarreal, Vladimir; Bravo, José (1905-06-30)
      In a given environment, distributing different devices with computing capabilities around us opens up new possibilities. It allows simple and easy interaction between user and computer. In this work we propose an approach ...
    • Educación Virtual: Una Visión de Inclusión 

      de Clunie, Gisela T. (1905-06-30)
      Cada día crece más el número de personas que presenta dificultad para asistir a un salón de clases presencial, concluir sus estudios o mantenerse actualizado y responder así a las demandas del mercado de trabajo y del ...