Now showing items 71-84 of 84

    • Simulación y procesado de aleaciones de aluminio mediante estirado en canal angular constante (ECAD) 

      Luis Pérez, Carmelo Upna; Garcés, Y. Upna (CENIM, 2002)   Artículo / Artikulua  OpenAccess
      En este trabajo se estudia el proceso denominado ECAD (Equal Channel Angular Drawing) que consiste en hacer atravesar un material a través de una matriz de sección transversal constante, que presenta un ángulo comprendido, ...
    • Situación actual y prospectiva de futuro del sector de las energías renovables en Navarra 

      Pintor Borobia, Jesús María Upna; García Ortega, Justo Upna; Faulín Fajardo, Javier Upna; Lera López, Fernando Upna (Gobierno de Navarra, Departamento de Economía y Hacienda, 2003)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Razones económicas y medioambientales han hecho que la búsqueda de nuevas formas de energía se haya intensificado en los últimos años, desarrollándose distintos tipos de energías renovables. En el caso de la Unión Europea, ...
    • Spacing roughness parameters analysis on the EDM of Inconel (R) 600 alloy 

      Torres Salcedo, Alexia Upna; Puertas Arbizu, Ignacio Upna; Luis Pérez, Carmelo Upna (Elsevier, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Many research studies may be found regarding the measurement of surface roughness parameters. Most of them are focused on amplitude parameters as they are the most commonly used in industry, while little research has been ...
    • Spacing roughness parameters analysis on the EDM of TiB2 

      Torres Salcedo, Alexia Upna; Luis Pérez, Carmelo Upna; Puertas Arbizu, Ignacio Upna (Elsevier, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Titanium diboride (TiB2) is a novel sintered ceramic material which has attracted a great deal of interest because of its excellent mechanical properties, wear resistance and chemical resistance. At present, this ceramic ...
    • Strain mapping and nanocrystallite size determination by neutron diffraction in an aluminum alloy (AA5083) severely plastically deformed through equal channel angular pressing 

      González Crespo, Pedro Antonio Upna; Luis Pérez, Carmelo Upna; Hughes, Darren J.; Turrillas, X. (Hindawi, 2013)   Artículo / Artikulua  OpenAccess
      Six specimens of an aluminum alloy (AA-5083) extruded by Equal Channel Angular Pressing following two different routes plus a blank sample were examined with a neutron radiation of 1.5448 ˚ A. Macrostrain maps from the ...
    • Study of a complete thermoelectric generator behavior including water-to-ambient heat dissipation on the cold side 

      Aranguren Garacochea, Patricia Upna; Astrain Ulibarrena, David Upna; Martínez Echeverri, Álvaro Upna (Springer USTMSIEEE, 2014)   Artículo / Artikulua  OpenAccess
      The reduction of the thermal resistances of the heat exchangers of a thermoelectric generation system (TEG), leads to a significant increase in the TEG efficiency. For the cold side of a thermoelectric module (TEM), a wide ...
    • Study of corrosion in a biomass boiler 

      Berlanga Labari, Carlos Upna; Ruiz Bermejo, José Antonio Upna (Hindawi, 2013)   Artículo / Artikulua  OpenAccess
      Biomass plants, apart from producing energy, help to reduce CO2(g) emissions. One of the biggest problems for their development is superheater corrosion due to fuel corrosivity, especially of the straw. This limits both ...
    • Study of thermoelectric systems applied to electric power generation 

      Rodríguez García, Antonio Upna; González Vian, José Upna; Astrain Ulibarrena, David Upna; Martínez Echeverri, Álvaro Upna (Elsevier, 2009)   Artículo / Artikulua  OpenAccess
      A computational model has been developed in order to simulate the thermal and electric behaviour of the thermoelectric generators. This model solves the non linear system of equations of the thermoelectric and heat transfer ...
    • A theoretical model of the endothelial cell morphology due to different waveforms 

      Sáez, Pablo; Malvè, Mauro Upna; Martínez, Miguel Ángel (Elsevier, 2015)   Artículo / Artikulua  OpenAccess
      Endothelial cells are key units in the regulatory biological process of blood vessels. They represent an interface to transmit variations on the fluid dynamic changes. They are able to adapt its cytoskeleton, by means of ...
    • Thermoelectric generators for waste heat harvesting: a computational and experimental approach 

      Aranguren Garacochea, Patricia Upna; Araiz Vega, Miguel Upna; Astrain Ulibarrena, David Upna; Martínez Echeverri, Álvaro Upna (Elsevier, 2017)   Artículo / Artikulua  OpenAccess
      Waste heat generation has a widespread presence into daily applications, however, due to the low-temperature grade which presents, its exploitation with the most common technologies is complicated. Thermoelectricity ...
    • Thermoelectric power generation optimization by thermal design means 

      Aranguren Garacochea, Patricia Upna; Astrain Ulibarrena, David Upna (InTechOpen, 2016)   Capítulo de libro / Liburuen kapitulua  OpenAccess
      One of the biggest challenges of the twenty‐first century is to satisfy the demand for electrical energy in an environmentally speaking clean way. Thus, it is very important to search for new alternative energy sources ...
    • Thermoelectric self-cooling for power electronics: increasing the cooling power 

      Martínez Echeverri, Álvaro Upna; Astrain Ulibarrena, David Upna; Aranguren Garacochea, Patricia Upna (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
      Thermoelectric self-cooling was firstly conceived to increase, without electricity consumption, the cooling power of passive cooling systems. This paper studies the combination of heat pipe exchangers and thermoelectric ...
    • Thermoelectric-driven autonomous sensors for a biomass power plant 

      Rodríguez García, Antonio Upna; Astrain Ulibarrena, David Upna; Martínez Echeverri, Álvaro Upna; Gubía Villabona, Eugenio Upna; Sorbet Presentación, Francisco Javier Upna (Springer USTMSIEEE, 2013)   Artículo / Artikulua  OpenAccess
      This work presents the design and development of a thermoelectric generator intended to harness waste heat in a biomass power plant, and generate electric power to operate sensors and the required electronics for wireless ...
    • Zero-power-consumption thermoelectric system to prevent overheating in solar collectors 

      Martínez Echeverri, Álvaro Upna; Astrain Ulibarrena, David Upna; Rodríguez García, Antonio Upna (Elsevier, 2014)   Artículo / Artikulua  OpenAccess
      Highly promoted by the European Union Climate and Energy Package for 2020, solar collectors stand out as the most promising alternative to meet water heating demands. One of the most limiting problems in these systems ...