Now showing items 89-108 of 115

    • Propositional calculus and binary calculus 

      Skliar, Osvaldo; Medina, Víctor (Universidad Nacional [Costa Rica], 1990-01-01)
      We present an efficient method of propositional calculus which allows the manipulation of logical functions with an arbitrary number of propositional variables. This method is base on the use of binary sequences (in other ...
    • La radiación de frenado en campos magnéticos fuertes 

      Semionova N., L; Páez, Jorge (Universidad Nacional [Costa Rica], 1989-01-01)
      Presentamos un análisis de las funciones de transición de Bremsstrahlung en función de la polarización de espín total del electrón a lo largo del campo magnético externo y la polarización lineal o circular de la radiación ...
    • Raman spectroscopy as a tool to evaluate oxygen effects on the response of polymer gel dosimetry 

      Chacón Obando, David M; Vedelago, J; Strumia, M.C; Valente, M; Mattea, F. (Elsevier, 2019-05-06)
      Currently, advanced dosimeters like polymer gels are capable of obtaining reliable and accurate 3D dose distributions from correlations with the different polymerization degrees induced by incident radiation. Samples of ...
    • Rasgos hidrográficos y batimétricos del Refugio Nacional de Vida Silvestre Ostional y áreas adyacentes, Guanacaste, Costa Rica 

      Brenes Rodríguez, Carlos L.; Márquez-Artavia, Amaru; Quirós, Warner; BENAVIDES, ROSARIO (Universidad Nacional (Costa Rica), 2012-12)
      Entre el 6 y el 11 de febrero del 2012, se realizó un levantamiento hidrográfico y batimétrico en la región situada entre Punta Guiones y Cuajiniquil, en el Pacífico norte de Costa Rica. Las temperaturas superficiales se ...
    • Reverse circulation in Bahía Santa Elena, North Pacific of Costa Rica 

      Tisseaux Navarro, Alexandre; Salazar Ceciliano, Juan Pablo; Cambronero Solano, Sergio; Vargas-Hernández , José Mauro ; Márquez-Artavia, Xiomara (Elsevier B.V., 2021-02-10)
      This work describes the water circulation of Bahía Santa Elena using velocity fields and hydrographic data obtained from a ship-mounted Acoustic Doppler Current Profiler and a vertical profiler Conductivity–Temperature–Depth ...
    • Rotating magnetic shallow water waves and instabilities in a sphere 

      Márquez-Artavia, Xiomara; Jones, Christopher; Tobias, Steven (University of Leeds, United Kingdom, 2017)
      Waves in a thin layer on a rotating sphere are studied. The effect of a toroidal magnetic field is considered, using the shallow water ideal MHD equations. The work is motivated by suggestions that there is a stably ...
    • Seasonal signatures in the physical properties of a tropical estuary in the Central America Pacific 

      Brenes, C.L.; Benavides, R.; Ballestero, D. (Universidad Nacional (Costa Rica), 2013)
      A hydrographic survey was carried out in the Jaltepeque estuary in the Pacific coast of El Salvador. From September 2005 to March 2006, 10 sampling stations were occupied to measure temperature, ...
    • Several Tsunami Scenarios at the North Sea and their consequences at the German Bight 

      Chacon-Barrantes, Silvia; Narayanan, Rangaswami; Mayerle, Roberto (Journal of Tsunami Society International vol.32 no.1 2013, 2013)
      Tsunamis occurred in the past at the North Sea, but not frequently. There are historical and geological records of several tsunamis: the Storegga tsunami caused sediment deposits in Scotland 8,000 years ago and records of ...
    • Simulación rápida de la propagación del tsunami de Chile de 1960 hasta la Bahía de Hilo en Hawaii 

      Chacon-Barrantes, Silvia (Tecnología en marcha Vol.20 No.4 24-29, 2007)
      En este trabajo se simula la propagación del tsunami de Chile de 1960, desde su región de generación hasta la bahía de Hilo en Hawái, empleando un método híbrido que permite obtener resultados en un intervalo relativamente ...
    • Sistema Nacional de Monitoreo de Tsunamis 

      Chacon-Barrantes, Silvia (Revista Universidad en Diálogo vol.5 no.2 101-111 2015, 2015)
      En cualquier cuerpo de agua, y más específicamente en cualquier océano, se pude generar un tsunami. Por esto, nuestro país, al tener dos costas, se encuentra expuesto a ellos. Los tsunamis no se pueden evitar ni pronosticar ...
    • Sizeable beta-strength in 31Ar (β3p) decay 

      Koldste, G.T.; Blank, B.; Borge, M.J.G.; Briz, J.A.; Carmona-Gallardo, M.; Fraile, L.M.; Fynbo, H.O.U.; Giovinazzo, J.; Johansen, J.G.; Thomas, J.C.; Jokinen, A.; Jonson, B.; Kurturkian-Nieto, T.; Nilsson, T.; Perea, A.; Pesudo, V.; Picado, Esteban; Riisager, K.; Saastamoinen, A.; Tengblad, O.; Van del Walle, J. (Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2014-10-07)
      We present for the first time precise spectroscopic information on the recently discovered decay mode β-delayed 3p-emission. The detection of the 3p events gives an increased sensitivity to the high energy part of the ...
    • Slow westward movement of salinity anomalies across the tropical South Indian Ocean 

      Vargas-Hernández , José Mauro ; Wijffels, Susan; Meyers, Gary; Holbrook, Neil (American Geophysical Union, 2015-08-06)
      Decadal salinity variability is an important characteristic of the ocean. It characterizes differences in evaporative and precipitation fluxes at the surface, and in the subsurface it contributes to steric sea level change ...
    • Sobre el transporte de partículas en cuerpos oceánicos semicerrados (ING) 

      Quirós Álvarez, Guillermo (Universidad Nacional (Costa Rica), 1984-07-01)
      El flujo residual ha mostrado tener una función relevante en el transporte de partículas en suspensión, larvas y algunos contaminantes, principalmente. Este se establece como consecuencia de la interacción entre la onda ...
    • Synthesis of a metal chelating monomer for radiation polymer dosimetry 

      Wolfel, Alexis; Chacón Obando, David M; Romero, Marcelo Ricardo; VALENTE, MAURO; Mattea, Facundo (Elsevier Ltd, 2021-03)
      To enhance the performance of polymeric dosimeters it is necessary to design novel formulations considering the mechanisms that register the absorbed dose (e.g. induced polymerization) and the readout method. The combination ...
    • Temperatura y humedad relativas en un secador solar de plantas para la salud 

      Chaverri, Diego; Moya, Roberto (Universidad Nacional (Costa Rica), 2008)
      Se describen las características de un secador solar pasivo, tipo invernadero, que se utiliza para el secado de plantas para la salud en la zona norte de Costa Rica. Se analiza el régimen de temperaturas en función de la ...
    • The 2017 México Tsunami Record, Numerical Modeling and Threat Assessment in Costa Rica 

      Chacón-Barrantes, Silvia (Springer, 2018-03-30)
      An Mw 8.2 earthquake and tsunami occurred off- shore the Pacific coast of Me´xico on 2017-09-08, at 04:49 UTC. Costa Rican tide gauges have registered a total of 21 local, regional and far-field tsunamis. The Quepos gauge ...
    • The magnetic dispersion 

      Páez, Jorge; Semionova, Liudmila (Editorial de la Universidad Nacional, 1985-01-01)
      We present a study of the elastic scattering of an electron in a constant homogeneous magnetic field. The dependency of the cross section on the electron spin orientation is given. If the spin polarization is along or ...
    • The rip current hazard in Costa Rica 

      Arozarena, Isabel; Houser, Chris; Gutiérrez-Echeverría, Alejandro; Brannstrom, Christian (2015-01-31)
      Deaths from rip currents are a major hazard on global beaches, but few data are available at a national scale to support the development of appropriate intervention programs. Analysis of data from the Judicial Investigation ...
    • The rock coast of South and Central America 

      Blanco-Chao, Ramon; Pedoja, Kevin; Witt, César; martinod, joseph; Husson, Laurent; Regard, Vincent; Audin, Laurence; Nexer, Maëlle; delcaillau, bernard; Saillard, Marianne; Melnick, Daniel; Dumont, Jean Francois; Santana, Essy; Navarrete, Edison; Martillo, Carlos; PAPPALARDO, MARTA; Ayala, Luis; Araya, J.F.; Feal-Pérez, A.; Correa, D.; Arozarena-Llopis, Isabel (Geological Society Memoirs 2014, 2014-07)
      The great variety of climatic conditions, tidal ranges and wave regimes of South and Central America act on a complex geology and tectonic framework. Many of the rock and cliffed coasts of South America are strongly ...
    • Tsunami de las islas Kermadec del 4 de marzo del 2021: registros, modelado numérico y atención del evento para Costa Rica 

      Porras Espinoza, Hernán; Chacon-Barrantes, Silvia; Murillo Gutiérrez, Anthony; Rivera, Fabio (Universidad Nacional (Costa Rica), 2022-03-23)
      El 4 de marzo de 2021 ocurrió un sismo de Mw=8.1 en la trinchera de Tonga-Kermadec, que generó una advertencia de tsunami por parte del Centro de Alerta de Tsunamis del Pacífico (PTWC). Se presenta un evento por parte ...