• Induced Desorption of DDT, DDD, and DDE from a Contaminated Sediment 

      Jafvert, Chad; Vogt, Beth; Fábrega Duque, José (1997-03-01)
      Release profiles of p,p′-DDT, p,p′-DDD, and p,p′-DDE from sediment collected from Indian Creek, Alabama, were measured with a gas purge-induced desorption technique and compared to a model developed in this work. DDT entered ...
    • Modeling Short-Term Soil−Water Distribution of Aromatic Amines 

      Fábrega Duque, José; Li, Hui; Jafvert, Chad; Lee, Linda (1998-08-12)
      The applicability of a distributed parameter model for describing the distribution of aniline and α-naphthylamine between soil and aqueous phases at short contact times was assessed. Mass action equations considered in the ...
    • Modeling Abiotic Processes of Aniline in Water-Saturated Soils 

      Fábrega Duque, José; Jafvert, Chad; Li, Hui; Lee, Linda (2000-03-18)
      The long-term interactions of aromatic amines with soils are important in defining the fate and transport of these compounds in the environment. Abiotic loss of aniline from the aqueous phase to the soil phase occurs with ...
    • Remoção de íons de metais pesados com bentonitas modificadas 

      Tejedor De León , Alexis; Goulart Nunes, Denise; Rubio, Jorge (2001)
      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. ...
    • Modeling Competitive Cation Exchange of Aromatic Amines in Water-Saturated Soils 

      Fábrega Duque, José; Jafvert, Chad; Li, Hui; Lee, Linda (2001-06-01)
      Competitive association to several components of soil through ion exchange processes influences the fate of organic cations in the environment. To examine these processes, the distributions of aniline and 1-aminonaphthalene ...
    • Role of pH in partitioning and cation exchange of aromatic amines on water-saturated soils 

      Li, Hui; Lee, Linda; Fábrega Duque, José; Jafvert, Chad (2001-08-04)
      Predicting the reversible interactions between aromatic amines and soil is essential for assessing the mobility, bioavailability and exposure from contaminated sites. Reversible sorption mechanisms of aniline and α-naphthylamine ...
    • 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. (2003)
      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 (2003)
      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) ...
    • Adsorption of Cu ions onto a 1.10 phenanthroline-grafted Brazilian bentonite 

      Tejedor De León, Alexis; Goulart Nunes, Denise; Rubio, Jorge (2003-02-01)
      The grafting, by chemical adsorption, of molecular 1.10-phenanthroline (OP) onto some Brazilian bentonite (montmorillonites) was studied to improve their adsorptive capacities to remove Cu ions from synthetic wastewater. ...
    • Vertical Movement of Resonance Hopping Robot with Electric Drive and Simple Control System 

      Montes Franceschi, Héctor; Akinfiev, Teodor; Armada, Manuel (2003-06-01)
      In the paper vertical movements of resonance hopping robot with one leg and electric drive are considered. Special construction of hopping robot with compensation of losses during flight of the robot allows to employ a ...
    • Advances in the adsorptive particulate flotation process 

      Feris, LA; Santander, M; Rubio, J; Tejedor De León, Alexis (2003-09-18)
      The removal of contaminants from liquid effluents by the adsorptive particulate flotation (APF) process, including new adsorbents and flotation devices, are reported. Herein, contaminants are adsorbed (and/or absorbed) ...
    • La responsabilidad civil por daño ambiental, en la actualidad del derecho positivo panameño 

      Flores, Elsa (2003-12-01)
      La responsabilidad civil por daño ambiental toma en consideración los daños sociales, la individualización del sujeto responsable y las dificultades de determinar el monto de la indemnización. La responsabilidad objetiva ...
    • Seismic Response of Single-Degree-of-Freedom (SDOF) Structural Fuse Systems 

      Vargas, Ramiro; Bruneau, Michel (2004)
      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 (2004)
      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 ...
    • Robust Cascade Controller for Nonlinearly Actuated Biped Robots: Experimental Evaluation 

      Caballero, Rony; Armada, Manuel; Akinfiev, Teodor (2004)
      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 ...
    • Investigation of the Structural Fuse Concept 

      Vargas, Ramiro; Bruneau, Michel (2004)
      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 ...
    • Adding extra sensitivity to the SMART non‐linear actuator using sensor fusion 

      Montes Franceschi, Héctor; Caballero, Ronny; Armada, Manuel (Industrial Robot: The International Journal Of Robotics Research And Application, 2004-03-01)
      The prospect of using humanoid robots in practical applications attracts an important research effort and the latest steps forward in robot technology show many remarkable achievements where design aspects, control systems ...
    • Estado Actual del Mercado de Frutos y Vegetales Frescos Cortados en Panamá 

      Tejedor, Wedleys (2004-04-01)
      Uno de los principales problemas que confrontan las empresas dedicadas a la elaboración de frutos y vegetales frescos cortados en Panamá, es que no se han realizado estudios tendientes a establecer el tiempo de vida útil ...
    • ROBOCLIMBER: Control System Architecture 

      Montes Franceschi, Héctor; Armada, Manuel; Nabulsi, Samir (2004-07-01)
      The paper shows the complete system architecture of a walking and climbing robot developed to make slope consolidation, where heavy duty equipment is employed for drilling up to 20m holes. ROBOCLIMBER a quadruped robot ...
    • Measuring contribution of infoplazas to internet penetration and use in Panama 

      Miller, Norma L. (2004-12)
      infoplazas arose in Panama as means to combat the digital gap by providing Internet connectivity to the economically disadvantaged and geographically remote. Yet there is a dearth of information regarding their actual ...