Exploració per tema "Copper"

Ara es mostren els items 1-20 de 56

    • A high productivity bioprocess for obtaining metallic copper from printed circuit boards (PCBs) 

      Iglesias González, Nieves; Dorado Castaño, Antonio David; Ramírez del Amo, Pablo; Mazuelos Rojas, Alfonso (2024-01-01)
      Article
      Accés restringit per política de l'editorial
      PCBs constitute a residue rich in metals, among which copper stands out due to its majority content, much higher than that found in natural deposits, so that it is a potential secondary resource. Many attempts have been ...

    • Ab initio cluster model study of geometry and bonding character of atomic nitrogen chemisorbed on the Cu(100) and Ag(100) surfaces 

      Ricart Pla, Josep Manel; Torras Costa, Juan; Rubio, Jaime; Illas, Francesc (1997-03-10)
      Article
      Accés restringit per política de l'editorial
      The chemisorption of atomic nitrogen on the four-fold site Cu(100) and Ag(100) surfaces has been modeled by Cu5N, AgsN and Cu41N cluster models. For these clusters, ab initio Hartree Fock electronic wave functions have ...

    • An alternative approach to assess the habitat selection of folsomia candida in contaminated soils 

      Bori Dols, Jaume; Riva Juan, Mª del Carmen (2015-11-01)
      Article
      Accés obert
      Avoidance tests with collembolans provide a quick assessment of soil quality. However, some parameters of the procedure can be modified in order to increase its performance. In this study we assessed the tendency of Folsomia ...

    • An ultra-fast annealing treatment by electropulsing during pure copper wire drawing 

      González Rojas, Hernán Alberto; Sánchez Egea, Antonio José; Hameed, Saqib; Bolmaro, Raúl (Multidisciplinary Digital Publishing Institute (MDPI), 2019-11-23)
      Article
      Accés obert
      The influence of electropulses in situ on the drawing process of copper wires was investigated with the aim of avoiding time consuming annealing thermal treatments. It was found that with the application of electropulses, ...

    • Assessment of Chemical and Electronic Surface Properties of the Cu2ZnSn(SSe)4 after Different Etching Procedures by Synchrotron-based Spectroscopies 

      Olar, Tetiana; Lauermann, Iver; Haibing, Xie; Neuschitzer, Markus; Saucedo, Edgardo; Calvet, Wolfram; Steigert, Alexander; Ümsür, Bünyamin; Chacko, Binoy; Parvan, Vladimir; Gorgoi, Mihaela; Senkovskiy, Boris; Lux-Steiner, Martha Ch. (Elsevier Ltd, 2015)
      Article
      Accés obert
      Kesterite Cu2ZnSn(S,Se)4 absorber layers with different [S]/([S]+[Se]) ratios were studied using XPS, UPS, Hard X-ray (HIKE) photoemission and the Near Edge X-ray Absorption Fine Structure spectroscopy (NEXAFS). The samples ...

    • Biopesticides as alternatives to reduce the use of copper in Spanish and Portuguese viticulture: Main trends in adoption 

      Ortega Rioja, Paula; Salcedo Cidoncha, Ramón; Sánchez Sánchez, Elena; Gil Moya, Emilio (2023-11)
      Article
      Accés restringit per política de l'editorial
      The traditional use of copper as a fungicide in vineyards has raised concerns among authorities as it increases environmental pollution. As a result, new regulations have been enacted to reduce the use of plant protection ...

    • Bycrystal interface energy computation of growth and alignment of facets in nanocrystalline cooper 

      Ayuso Martínez, Mónica (Universitat Politècnica de Catalunya, 2017-09-22)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      Realitzat a/amb:   University of Colorado Colorado Springs
      Grain boundaries are of great importance in polycrystalline materials on account of the major influence they have on their properties and behavior. Deformation twining, interface sliding, recrystallization or microstructure ...

    • Capas de CulnSe2 para células solares: análisis por espectroscopia Raman de capas pobres en Cu 

      Arias Montenegro, Francisco Javier (Universitat Politècnica de Catalunya, 2009-06)
      Projecte/Treball Final de Carrera
      Accés obert
      En este trabajo se presenta un estudio mediante espectroscopía Raman de capas CuInSe2 sintetizadas en condiciones de defecto de Cu, en función de su composición. El interés del estudio viene motivado por el potencial de ...

    • Catalytic performance of zinc-supported copper and nickel catalysts in the glycerol hydrogenolysis 

      Chimentäo, Ricardo José; Miranda Morales, Bárbara C.; Gispert Guirado, Francesc; Medina Cabello, Francisco; Llorca Piqué, Jordi; Santos, João Batista O. (2020-03-01)
      Article
      Accés obert
      Gas-phase catalytic conversion of glycerol to value added chemicals was investigated over zinc-supported copper and nickel catalysts. The addition of aluminum in the support was also investigated in glycerol conversion and ...

    • Cation-exchange membrane as nanoreactor: intermatrix synthesis of platinum-copper core-shell nanoparticles 

      Muraviev, Dmitri N.; Macanás de Benito, Jorge; Parrondo, Javier; Muñoz Tapia, Maria; Alonso González, Amanda; Alegret Sanroma, Salvador; Ortueta, Mónica; Mijangos Antón, Federico (2007-12)
      Article
      Accés restringit per política de l'editorial
      The physical and chemical properties of metal nanoparticles (MNPs) are distinct from those of both bulk metal and isolated atoms. The main drawback of MNP is their instability and high trend for aggregation. Without ...

    • Composition, nanostructure, and optical properties of silver and silver-copper lusters 

      Pradell Cara, Trinitat; Pavlov, R.S.; Gutiérrez Repiso, Carolina; Climent Font, Aurelio; Molera Marimon, Judit (American Institute of Physics (AIP), 2012-09-01)
      Article
      Accés obert
      Lusters are composite thin layers of coinage metal nanoparticles in glass displaying peculiar optical properties and obtained by a process involving ionic exchange, diffusion, and crystallization. In particular, the origin ...

    • Desarrollo de nuevas aleaciones Al-Si-Cu microaleadas 

      Gual Amengual, Pau; Izquierdo Pascual, Mariano (Universitat Politècnica de Catalunya, 2019-02-06)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      [CASTELLÀ] El objetivo principal de este trabajo ha sido realizar un estudio del efecto de los diferentes elementos de aleación añadidos a la aleación de aluminio AlSi9Cu3. Estos elementos son el Zn, Mg, Cr, Zr y el afinante ...

    • Efecto de los elementos microaleantes en las aleaciones de aluminio para fundición 

      Martínez Cabornero, Leire; Martínez Mercadé, Francesc (Universitat Politècnica de Catalunya, 2019-06)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      Realitzat a/amb:   Bostlan / Aleastur / CIE Automotive. Componentes Vilanova
      [CASTELLÀ] El objetivo principal de este trabajo es realizar un estudio de los diferentes elementos de aleación añadidos al AlSi9Cu3, proporcionado por CIE Componentes VIlanova, también denominado EN AC 46500. Estos elementos ...

    • Elemental copper recovery from e-wastes mediated with a two-step bioleaching process 

      Benzal Montes, Eva; Solé Sardans, Maria Montserrat; Lao Luque, Concepción; Gamisans Noguera, Javier; Dorado Castaño, Antonio David (Springer, 2020-03-27)
      Article
      Accés obert
      Copper recovery from printed circuit boards (PCB) from waste mobile phones was investigated using a two-step bioleaching process. The method consists of a first step where Fe(II) ions are biologically oxidised to Fe(III) ...

    • Estudi comparatiu de l'extracció de metalls d'un mineral a partir del mètode convencional i de biolixiviació 

      Yustos Pérez, Víctor (Universitat Politècnica de Catalunya, 2015-06-09)
      Treball Final de Grau
      Accés obert
      El present projecte tracta sobre l’extracció del coure de la calcopirita. La recuperació de coure s’ha realitzat mitjançant l’aplicació dels següents mètodes: un mètode convencional hidrometal·lúrgic i biolixiviació ...

    • Estudi i disseny d'un utillatge per la fabricació de conductors laminats de coure 

      Sanjuan Segarra, Albert (Universitat Politècnica de Catalunya, 2017-01)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      En aquest projecte es pretén crear un utillatge per poder agilitzar i optimitzar la fabricació de conductors laminats. Aquests conductors elèctrics estan formats per tres peces de coure (làmines, xapes i reblons) que han ...

    • Estudio de la selectividad y sensibilidad de sensores comerciales serigrafiados modificados con nanopartículas para la determinación de metales pesados en aguas contaminadas 

      Ortuño Acuña, Jhoselin Dayana (Universitat Politècnica de Catalunya, 2022-07-07)
      Treball Final de Grau
      Accés obert
      Los metales pesados actualmente generan un gran impacto en la contaminación acuática, especialmente los metales pesados como por ejemplo el zinc, el cadmio, el plomo y el cobre. Estos metales contaminan los cuerpos ...

    • Estudio del efecto de los escalones superficiales en la nanoindentación del cobre 

      Galceran Oms, Laura (Universitat Politècnica de Catalunya, 2017-05)
      Projecte Final de Màster Oficial
      Accés obert
      En esta memoria se pretende recoger los resultados obtenidos en las simulaciones numéricas de nanoindentación realizadas durante el proyecto de final del Máster de Ciencia e Ingeniería de materiales, realizado en la UPC. ...

    • Fabrication and deposition of copper and copper oxide nanoparticles by laser ablation in open air 

      Fernández Arias, M.; Boutinguiza Larosi, Mohamed; del Val García, Jesús; Riveiro, A.; Rodríguez Aranda, Daniel; Arias González, Felipe; Gil Mur, Javier; Pou Saracho, Juan María (2020-02)
      Article
      Accés obert
      The proximity of the “post-antibiotic era”, where infections and minor injuries could be a cause of death, there are urges to seek an alternative for the cure of infectious diseases. Copper nanoparticles and their huge ...

    • Historical copper and iron coloured glazes and glasses 

      Yuan, Mingyue (Universitat Politècnica de Catalunya, 2023-11-17)
      Tesi
      Accés obert
      (English) Coloured glazes and glasses have attracted human interest since antiquity for their aesthetic appeal and multiple functionalities. As indicators of technological progress, artistic expression, and social ...