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Mostrando ítems 105-114 de 114

    • The mechanical career of Councillor Orffyreus, confidence man 

      Jenkins Villalobos, Alejandro (2013-05)
      In the early 18th century, J. E. E. Bessler, known as Orffyreus, constructed several wheels that he claimed could keep turning forever, powered only by gravity. He never revealed the details of his invention, but he ...

    • The problem of engines in statistical physics 

      Alicki, Robert; Gelbwaser Klimovsky, David; Jenkins Villalobos, Alejandro (2021-08-22)
      Engines are open systems that can generate work cyclically at the expense of an external disequilibrium. They are ubiquitous in nature and technology, but the course of mathematical physics over the last 300 years has ...

    • Tropical easterly waves over Costa Rica and their relationship to the diurnal cycle of rainfall 

      Wiggins, Rani M.; Lintner, Benjamin R.; Serra, Yolande L.; Durán Quesada, Ana María; Garbanzo Salas, Marcial; Hernández Deckers, Daniel; Torri, Giuseppe (2023-01)
      Using an index of tropical easterly wave (TEW) activity derived from spacetime-filtered outgoing longwave radiation, we construct composites of long-term hourly surface meteorological observations and morningtime sounding ...

    • Tropical precipitation anomalies and d‐excess evolution during El Niño 2014‐16 

      Sánchez Murillo, Ricardo; Durán Quesada, Ana María; Birkel Dostal, Christian; Esquivel Hernández, Germain; Boll, Jan (2016)
      The last 2014-16 El Niño event was among the three strongest episodes on record. El Niño considerably changes annual and seasonal precipitation across the tropics. Here, we present a unique stable isotope data set of daily ...

    • Tsunamis and Tsunami Hazards in Central America 

      Fernández Arce, Mario Enrique; Molina, Enrique; Havskov, Jens; Kuvvet, Atakan (2000-02)
      A tsunami catalogue for Central America is compiled containing 49 tsunamis for the period 1539–1996, thirty seven of them are in the Pacific and twelve in the Caribbean. At the Caribbean side, 5 events are related with ...

    • Tsunamis and tsunami prepardness in Costa Rica, Central America 

      Fernández Arce, Mario Enrique; Alvarado Delgado, Guillermo (2005-12)
      Pacific and Atlantic sides of Costa Rica there are coastal segments characterised by a flat relief, which increases the vulnerability of the coastal communities. In addition to tsunamis originating in the Middle American ...

    • Vacuum treatment to stabilize oxidation at low temperature region in porous silicon 

      Allen, Kevin; Pereira Cubillo, Juan Sebastián; Ramírez Porras, Arturo (2020)
      Oxidation in porous silicon is studied for as-etched samples and samples subjected to high vacuum at room temperature. Attenuated Total Reflectance (ATR) measurements in infrared spectroscopy for temperatures ranging from ...

    • Validación de Calidades de Rayos X Diagnósticos en el Laboratorio de Metrología de Radiaciones Ionizantes 

      Mora Rodríguez, Patricia; Noguera Vega, Gerardo; Porras Chaverri, Mariela (2018)
      El objetivo del trabajo fue validar la calidad de radiación para energía de radiodiagnósticos del Laboratorio de Metrología de la Universidad de Costa Rica (UCR) como parte del proyecto técnico de cooperación COS9008 ...

    • Verificación del Comisionamiento del Acelerador Lineal UNIQUE de Varian 

      Calvo Alfaro, Jorge Arturo (2021)
      Esta tesis trata sobre la Verificación del Comisionamiento del Acelerador Lineal UNIQUE, el cual se encuentra en el Hospital México. La metodología usada para este fin comprende el Protocolo Internacional para la Determinación ...

    • Why is the electrocaloric effect so small in ferroelectrics? 

      Guzmán Verri, Gian Giacomo; Littlewood, Peter B. (2016-05-19)
      Ferroelectrics are attractive candidate materials for environmentally friendly solid state refrigeration free of greenhouse gases. Their thermal response upon variations of external electric fields is largest in the vicinity ...