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IOP publishing ltd |
Documentos disponibles de esta editorial (292)
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Ortega Villafuerte, Yanicet ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | IOP publishing ltd | 2007-03-21Sintering of a ZnO-SnO_2 mixture under argon flow leads to the growth of microrods on the sample surface, which are formed by oriented stacks of nanoplates. Energy dispersive spectroscopy and cathodoluminescence ( CL) in the scanning electron mi[...]![]()
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Sintering of ZnO pressed powder under Ar flow at temperatures between 1250 and 1300 degrees C leads to the formation of elongated microstructures and nanostructures, with different morphologies, on the sample surface. Rods and needles with cross[...]![]()
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Given a field vacuum state in a black hole spacetime, this state can be analysed in terms of how it is perceived (in terms of particle content) by different observers. This can be done by means of the effective-temperature function introduced by[...]![]()
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Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2007-04-18High aspect ratio GeO_2 nano- and microwires have been grown by thermal treatment at 600 degrees C of compacted Ge powder under argon flow. The wires have cross-sectional dimensions from less than 100 nm to about 1 mu m, depending on the duratio[...]![]()
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Compactifications of M-theory on manifolds with reduced holonomy arise as the local eleven-dimensional description of D6-branes wrapped on supersymmetric cycles in manifolds of lower dimension with a different holonomy group. Whenever the isomet[...]![]()
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Reglero, V. ; Giménez, A. ; Fabregat, J. ; Castro Rubio, Elisa de ; Fernández Figueroa, María José ; Castro, A. de | IOP publishing ltd | 1988-05From 1984 to 1986, we made several observational campaigns at Calar Alto and La Palma Observatories using the uvby and ß photometric systems to monitor a selected sample of late-type variable stars. In this paper we present the ß values for 38 [...]![]()
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We analyse changes of the Immirzi parameter in loop quantum gravity and compare their consequences with those of Lorentz boosts and constant conformal transformations in black-hole physics. We show that the effective value deduced for the Planck[...]![]()
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Arqueros Martínez, Fernando ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Vázquez Peñas, José Ramón | IOP publishing ltd | 2017-02Atmospheric conditions, such as the pressure (P), temperature (T) or air density (rho proportional to P/T), affect the development of extended air showers initiated by energetic cosmic rays. We study the impact of the atmospheric variations on t[...]![]()
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Román, L.E. ; Amézquita, M.J. ; Uribe, C.L. ; Maurtua, D.J. ; Costa, S.A. ; Costa, S.M. ; Keiski, R. ; Solís, J.L. ; Gómez, M.M. | IOP publishing ltd | 2020-12-14T16:10:07ZThe application of nanotechnology has gained importance in the finishing of textile products, imparting them functional properties, which are achieved without affecting the textile. A novel method was developed for the in situ growth of CuO nano[...]![]()
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Piqueras de Noriega, Javier ; Ortega Villafuerte, Yanicet ; Fernández Sánchez, Paloma ; Häußler, Dietrich ; Jäger, Wolfgang | IOP publishing ltd | 2013-10-02ZnO nanorods with Sn core regions grown by a thermal evaporation–deposition method from a mixture of SnO_2 and ZnS powders as precursors, are used to study the behaviour of liquid metal in the nanotubes' core regions and the formation of liquid [...]![]()
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Castaldini, A. ; Cavallini, A. ; Fraboni, B ; Piqueras de Noriega, Javier ; Méndez Martín, Bianchi | IOP publishing ltd | 1994Homogeneity, distribution and nature of defects in GaAs:Te wafers with different doping concentrations have been investigated by SPV (Surface PhotoVoltage) and EBIC (Electron Beam Induced Current) methods. The resulting radial distribution of th[...]![]()
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Zaldivar, M.H. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | IOP publishing ltd | 1998-08The effect of indentation on the cathodoluminescence (CL) of GaN:Si epitaxial films has been investigated in the scanning electron microscope. Deformation produces changes in the defect structure which are monitored through the changes induced i[...]![]()
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Díaz-Guerra Viejo, Carlos ; Vicent López, José Luis ; Piqueras de Noriega, Javier ; Dieguez, E. | IOP publishing ltd | 2007-01-07The influence of the doping level on the radiative recombination properties of GaSb:Se crystals has been investigated by cathodoluminescence (CL) microscopy and spectroscopy in the scanning electron microscope. CL images evidence a high dislocat[...]![]()
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Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Dutta, P. S. ; Dieguez, E. | IOP publishing ltd | 1997Cathodoluminescence (CL) in the scanning electron microscope (SEM) has been used to investigate the effect of doping with chromium and vanadium on the native accepters and on the general structure of extended defects of gallium antimonide single[...]![]()
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López, I ; Alonso Orts, Manuel ; Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2016-11Gallium oxide microrods have been grown by an evaporation-deposition method by using a precursor containing lithium in order to check the influence of such dopant on the morphology and physical properties of the obtained ß-Ga_2O_3 structures. SE[...]