Browsing DFis-Artículos, capítulos, libros... by Title

Now showing items 80-99 of 135

    • Ni/CeO2: a promising catalyst for water-gas shift 

      Ganduglia Pirovano, María Verónica; Carrasco, Javier; López Durán, David; Barrio, Laura; Liu, Ping; Rodríguez, José A. (American Chemical Society Division of Energy and Fuels, 2013)
      Hydrogen appears to be the best answer for the limited fossil fuel resources. The water-gas shift (WGS) reaction is a key step in the production of clean hydrogen. Noble metal (Au, Pd, Pt) clusters supported on reducible ...

    • Non-diffusive nature of collisionless α-particle transport: Dependence on toroidal symmetry in stellarator geometries 

      Gogoleva, A.; Tribaldos, V.; Reynolds-Barredo, J.M.; Sánchez, R.; Alcusón, J.A.; Bustos, A. (AIP Publishing, 2020)
      An adequate confinement of α-particles is fundamental for the operation of future fusion powered reactors. An even more critical situation arises for stellarator devices, whose complex magnetic geometry can substantially ...

    • Numerical and experimental study of an Ar/CO2 plasma in a point-to-plane reactor at atmospheric pressure 

      Barkhordari, A.; Mirzaei, S.I.; Falahat, A.; Rodero Serrano, Antonio (Elservier, 2020-12-10)
      The applicability of high voltage electrical discharge to reform Carbon Dioxide (CO2) as an environmental pollutant is a technique extensively proved. By this motive, the study of plasma with pure CO2 or its mixtures ...

    • Observation of impurity accumulation and its compatibility with high plasma performance in W7-X 

      Zhang, D.; Buttenschön, B.; Jablonski, S.; Kubkowska, M.; Ford, O.; Alcusón, J.A.; Beidler, C.D.; Burhenn, R.; Beurskens, M.N.A.; Langenberg, A.; Pablant, N.; Reimold, F.; Rahbarnia, K.; Smith, H.M.; Wegner, Th.; Wurden, G.; Bozhenkov, S.A.; Feng, Y.; Brunner, K.J.; Fuchert, G.; Gao, Y.; Geiger, J.; Giannone, L.; Höfel, U.; Hirsch, M.; Huang, Z.; Knauer, J.; Kremeyer, T.; Krychowiak, M; Kwak, S.; Laqua, H.P.; Laube, R.; Neuner, U.; Pasch, E.; Pavone, A.; von Stechow, A.; Svensson, J.; Thomsen, H. (2023)
      At the W7-X stellarator, the bolometer system has measured an intensive radiation zone in the inner plasma region (at a normalized radius ρ ∼ 0.3–0.4) in the hydrogen plasma generated by electron cyclotron resonance heating; ...

    • Odour impact simulation of a large urban wastewater treatment plant through the numerical solution of a Eulerian model 

      Márquez, Pedro; Muñoz Serrano, Encarnación; Siles López, José Ángel; Martín Santos, María Ángeles; Gutiérrez Martín, María del Carmen (Elsevier, 2024)
      This study aims to develop a solver to calculate the dispersion of emitted odour from the main sources located in a large urban wastewater treatment plant (WWTP). Its seasonal odour impact on surrounding areas, including ...

    • On the gas-phase graphene nanosheet synthesis in atmospheric microwave plasma torch: Upscaling potential and graphene nanosheet‑copper nanocomposite oxidation resistance 

      Toman, Jozef; Šnírer, M.; Rincón, Rocío; Jašek, O.; Všianský, D.; Raya, A.M.; Morales Calero, Francisco Javier; Muñoz, José; Calzada Canalejo, María Dolores (Elsevier, 2023)
      Efficient gas-phase synthesis of few-layer graphene nanosheets (GNS) is based on the controlled formation of the high-temperature environment and the reaction pathway of gas-phase species formed by the decomposition of ...

    • On the impact of wavelength dependency on supercontinuum generation in photonic crystal fibers 

      Díaz Soriano, Antonio Manuel; Ortiz Mora, Antonio; Martínez-Muñoz, David; Rodríguez, Pedro (MDPI, 2024)
      It is common practice when simulating propagation through an optical fiber to assume that its characteristic parameters are constant and determined solely by the central wavelength of the input pulse. In this paper, we ...

    • On the quasi-stationary approach to solve the electron Boltzmann equation in pulsed plasmas 

      Tejero del Caz, Antonio; Guerra, Vasco; Pinhão, Nuno; Pintassilgo, Carlos Daniel; Alves, Luis Lemos (IOP Publishing, 2021)
      This work analyzes the temporal evolution of the electron kinetics in dry-air plasmas (80% N2:20% O2), excited by electric-field pulses with typical rise-times of 10−9 and 10−6 s, applied to a stationary neutral gaseous ...

    • On- and off-center helium atom in a spherical multilayer quantum dot with parabolic confinement 

      Morcillo Arencibia, Milagros Francisca; Alcaraz Pelegrina, José Manuel; Sarsa, A.; Randazzo, Juan M. (Springer, 2023)
      The ground state energy of a helium atom inside a spherical multilayer quantum dot as a function of the atomic impurity location inside the quantum dot has been calculated. The multilayer quantum dot is modeled by a ...

    • Optimizing high-quality graphene nanoflakes production through organic (bio)-precursor plasma decomposition 

      Casanova, Ana; Rincón, Rocío; Muñoz, José; Ania, Conchi O.; Calzada Canalejo, María Dolores (Elsevier, 2021)
      Atmospheric pressure plasma-based technique for the decomposition of biofuels allows obtaining high-quality graphene powder in one step, without the use of neither metal catalysts nor specific substrates. Despite the ...

    • Overview of first Wendelstein 7-X high-performance operation 

      Klinger, T.; Andreeva, T.; Bozhenkov, S.; Brandt, C.; Burhenn, R.; Buttenschön, B.; Fuchert, G.; Geiger, B.; Grulke, O.; Laqua, H.P.; Pablant, N.; Rahbarnia, K.; Stange, T.; von Stechow, A.; Tamura, N.; Thomsen, H.; Turkin, Y.; Wegner, T.; Abramovic, I.; Äkaslompolo, S.; Alcusón, J.A.; Aleynikov, P.; Aleynikova, K.; Ali, A.; Alonso, A.; Anda, G.; Ascasibar, E.; Bähner, J.P.; Baek, S.G.; Balden, M.; Baldzuhn, J.; Bandluch, M.; Barbui, T.; Behr, W.; Beidler, C.; Benndorf, A.; Biedermann, C. (IOP Publishing, 2019)
      The optimized superconducting stellarator device Wendelstein 7-X (with major radius R = 5.5 m, minor radius a = 0.5 m, and 30 m3 plasma volume) restarted operation after the assembly of a graphite heat shield and 10 ...

    • Overview of the first Wendelstein 7-X long pulse campaign with fully water-cooled plasma facing components 

      Grulke, O.; Albert, C.; Alcusón, J.A.; Aleynikov, P.; Aleynikova, K.; Alonso, A.; Anda, G.; Andreeva, T.; Arvanitou, M.; Ascasibar, E. (2024)
      After a long device enhancement phase, scientific operation resumed in 2022. The main new device components are the water cooling of all plasma facing components and the new water-cooled high heat flux divertor units. Water ...

    • Partial Separability of the Schrödinger Equation Combined with a Jastrow Factor 

      Le Sech, C.; Sarsa, A. (American Chemical Society, 2023)
      Describing the Coulomb interactions between electrons in atomic or molecular systems is an important step to help us obtain accurate results for the different observables in the system. One convenient approach is to separate ...

    • Path Integral Monte Carlo Calculations of Calcium-Doped 4He Clusters 

      Rodríguez Cantano, Rocío; González Lezana, Tomás; Villarreal Herrán, Pablo; López Durán, David; Gianturco, Franco Antonio; Delgado Barrio, Gerardo (Wiley, 2014)
      The energetics and structures of HeNCa clusters have been studied by means of path integral Monte Carlo calculations. Sizes ranging between N=10 and 40 helium atoms were considered at T=1, 1.5, and 2 K. Radial and angular ...

    • Phase contrast imaging measurements and numerical simulations of turbulent density fluctuations in gas-fuelled ECRH discharges in Wendelstein 7-X 

      Bähner, J.-P.; Alcusón, J.A.; Hansen, S.K.; von Stechow, A.; Grulke, O.; Windisch, T.; Smith, H.M.; Huang, Z.; Edlund, E.M.; Porkolab, M.; Beurskens, M.N.A.; Bozhenkov, S.A.; Ford, O.P.; Vanó, L.; Langenberg, A.; Pablant, N.; Plunk, G.G.; Bañon Navarro, A.; Jenko, F. (Cambridge University Press, 2021)
      The fundamental nature of turbulent density fluctuations in standard Wendelstein 7-X (W7-X) stellarator discharges is investigated experimentally via phase contrast imaging (PCI) in combination with gyrokinetic simulations ...

    • Photon to axion conversion during Big Bang Nucleosynthesis 

      Cuesta, A.J.; Illana, J.I.; Masip, M. (IOP Publishing, 2023)
      We investigate how the resonant conversion at a temperature T¯=25-65 keV of a fraction of the CMB photons into an axion-like majoron affects BBN. The scenario, that assumes the presence of a primordial magnetic field and ...

    • Plasmas and acoustic waves to pattern the nanostructure and chemistry of thin films 

      Rico Gavira, Victor; Regodón Harkness, Guillermo Fernando; García Valenzuela, Aurelio; Marquez Alcaide, Antonio; Oliva Ramírez, Manuel; Rojas Ruiz, Teresa Cristina; Alvarez Molina, Rafael; Palomares Simón, Francisco Javier; Palmero Acebedo, Alberto; Rodríguez González-Elipe, Agustín (Elsevier, 2023-08-15)
      In this work, piezoelectric AWs and plasmas have been brought together during the growth of a thin film as a novel methodology of plasma-assisted thin film structuration. The ensuing effects have been investigated on a ...

    • Polar di-halogen molecules solvated in bosonic helium clusters: The paradigm of ICl(X) 

      de Lara Castells, María Pilar; Prosmiti, Rita; Delgado Barrio, Gerardo; López Durán, David; Villarreal Herrán, Pablo; Gianturco, Franco Antonio; Jellinek, Julius (American Physical Society, 2006)
      Energies and structures of 4HeN-ICl(X) complexes, N<=30, are determined within the framework of a recently developed Hartree-like approach [Phys. Rev. A 71, 033203 (2005)], in which the He atoms play the role of the ...

    • Polarization Properties of Laser Solitons 

      Rodríguez, Pedro; Jiménez, Jesús; Guillet, Thierry; Ackemann, Thorsten (MDPI, 2017)
      The objective of this paper is to summarize the results obtained for the state of polarization in the emission of a vertical-cavity surface-emitting laser with frequency-selective feedback added. We start our research with ...

    • La Politécnica de Belmez al Sur del Sur 

      Rodero Serrano, Antonio (Universidad de Córdoba, Escuela Politécnica Superior de Belmez, 2009)