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RUA Docencia (31)

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Aproximadamente 31 registro(s) hasta el momento: (journal)

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Recurso libre

The young open cluster Berkeley 55
Negueruela Díez, Ignacio - Marco Tobarra, Amparo

Formato:	info:eu-repo/semantics/article
Enlaces:	We present UBV photometry of the highly reddened and poorly studied open cluster Berkeley 55, revealing an important population of B-type stars and several evolved stars of high luminosity. Intermediate-resolution far-red spectra of several candidate members confirm the presence of…
Fecha:	2013-11-13
Recurso:	RUA Docencia

Recurso libre

Wavenumber dependence of the energy loss function of graphite and aluminium
Planes, Domingo J. - García Molina, Rafael - Abril Sánchez, Isabel - Arista, Néstor R.

Formato:	info:eu-repo/semantics/article
Enlaces:	The energy loss function of a material is a key parameter in the dielectric formalism used to describe the optical spectra and the excitations produced by swift charges in solids. Modelling the experimental energy loss function as a sum of…
Fecha:	2012-11-26
Recurso:	RUA Docencia

Recurso libre

Hot thermal X-ray emission from the Be star HD 119682
Torrejón Vázquez, José Miguel - Schulz, Norbert S. - Nowak, Michael A. - Testa, Paola - Rodes Roca, José Joaquín

Formato:	info:eu-repo/semantics/article
Enlaces:	We present an analysis of a series of four consecutive Chandra high-resolution transmission gratings observations, amounting to a total of 150 ks, of the Be X-ray source HD 119682 (=1WGA J1346.5–6255), a member of the new class of γ Cas…
Fecha:	2013-11-13
Recurso:	RUA Docencia

Recurso libre

Energy-loss straggling study of proton and alpha-particle beams incident onto ZrO2 and Al2O2 films
Behar, Moni - Fadanelli, Raúl C. - Abril Sánchez, Isabel - García Molina, Rafael - Nagamine, Luiz C.C.M.

Formato:	info:eu-repo/semantics/article
Enlaces:	The energy-loss straggling of zirconia (ZrO2) and alumina (Al2O3) has been experimentally determined for proton and alpha-particle beams mainly by means of the Rutherford backscattering technique and in some few cases using the transmission method. The incident energies of the…
Fecha:	2012-11-29
Recurso:	RUA Docencia

Recurso libre

Mathematics in physics education: scanning historical evolution of the differential to find a more appropriate model for teaching differential calculus in physics
Martínez Torregrosa, Joaquín - López Gay, Rafael - Gras Martí, Albert

Formato:	info:eu-repo/semantics/article
Enlaces:	Despite its frequent use, there is little understanding of the concept of differential among upper high school and undergraduate students of physics. As a first step to identify the origin of this situation and to revert it, we have done…
Fecha:	2007-11-05
Recurso:	RUA Docencia

Recurso libre

Problems encountered in calculations of collisional mixing in compounds
Konoplev, V. - Jiménez Rodríguez, J.J. - Gras Martí, Albert - Abril Sánchez, Isabel - Pérez Martín, A.M.C. - Caturla Terol, María José

Formato:	info:eu-repo/semantics/article
Enlaces:	Problems encountered in the description of ion-induced compositional changes in non-monatomic solids, on the basis of the binary collision approach (BCA), are reported. The ingredients of a collisional model responsible for eventual ambiguity of computer simulation results are pointed out.…
Fecha:	2012-11-26
Recurso:	RUA Docencia

Recurso libre

Radial profile of energetic particles bombarding the substrate in a glow discharge
Moreno Marín, Juan Carlos - Abril Sánchez, Isabel - García Molina, Rafael

Formato:	info:eu-repo/semantics/article
Enlaces:	We have analyzed in an interrelated way the main processes that occur in a glow discharge system: generation of the energetic particles that strike the cathode, emission of sputtered and reflected atoms from the cathode, and transport of these particles…
Fecha:	2012-11-27
Recurso:	RUA Docencia

Recurso libre

Molecular structure effects in the energy loss of swift boron molecular ions in solids
García Molina, Rafael - Heredia Ávalos, Santiago - Abril Sánchez, Isabel

Formato:	info:eu-repo/semantics/article
Enlaces:	We analyse the effects on the stopping power due to the geometrical structure of swift Bn+ (n = 2-6) ions incident on amorphous carbon targets. We use the dielectric formalism to describe both the interaction of the projectile with the…
Fecha:	2012-11-27
Recurso:	RUA Docencia

Recurso libre

Experimental and theoretical determination of the stopping power of ZrO2 films for protons and α-particles
Behar, Moni - Denton Zanello, Cristian D. - Fadanelli, Raúl C. - Abril Sánchez, Isabel - Cantero, E.D. - García Molina, Rafael - Nagamine, Luiz C.C.M.

Formato:	info:eu-repo/semantics/article
Enlaces:	We report the results of an experimental-theoretical study on the stopping power of ZrO2 films for swift H and He ion beams. The experiments, using the Rutherford Backscattering technique, were done for protons with incident energies in the range 200–1500…
Fecha:	2012-11-29
Recurso:	RUA Docencia

Recurso libre

10.

Analytic expressions for the inelastic scattering and energy loss of electron and proton beams in carbon nanotubes
Emfietzoglou, Dimitris - Kyriakou, Ioanna - García Molina, Rafael - Abril Sánchez, Isabel - Kostarelos, Kostas

Formato:	info:eu-repo/semantics/article
Enlaces:	We have determined “effective” Bethe coefficients and the mean excitation energy of stopping theory (I-value) for multiwalled carbon nanotubes (MWCNTs) and single-walled carbon nanotube (SWCNT) bundles based on a sum-rule constrained optical-data model energy loss function with improved asymptotic properties.…
Fecha:	2012-11-29
Recurso:	RUA Docencia

Recurso libre

11.

Holographic photopolymer materials: nonlocal polymerization-driven diffusion under nonideal kinetic conditions
Kelly, John V. - O'Neill, Feidhlim T. - Sheridan, John T. - Neipp López, Cristian - Gallego Rico, Sergi - Ortuño Sánchez, Manuel

Formato:	info:eu-repo/semantics/article
Enlaces:	The kinetics of photosensitive polymer holographic recording materials are examined assuming a material that exhibits nonideal kinetic behavior. Previously, a linear relationship between monomer concentration and polymerization was assumed when deriving the nonlocal polymer-driven diffusion (NPDD) model. This is consistent…
Fecha:	2009-02-04
Recurso:	RUA Docencia

Recurso libre

12.

Target inner-shells contributions to the stopping power and straggling for H and He ions in gold
Heredia Ávalos, Santiago - Abril Sánchez, Isabel - Denton Zanello, Cristian D. - Moreno Marín, Juan Carlos - García Molina, Rafael

Formato:	info:eu-repo/semantics/article
Enlaces:	The electronic energy loss of swift H and He ions in gold is studied, paying special attention to the contribution to the projectile energy loss due to the ionization of the target inner-shells. We calculate the stopping power and the…
Fecha:	2012-11-27
Recurso:	RUA Docencia

Recurso libre

13.

Experimental and theoretical studies of the energy-loss straggling of H and He ion beams in HfO2 films
Abril Sánchez, Isabel - Behar, Moni - García Molina, Rafael - Fadanelli, Raúl C. - Nagamine, Luiz C.C.M. - Grande, P.L. - Schünemann, L. - Denton Zanello, Cristian D. - Arista, Néstor R. - Saitovitch, E.B.

Formato:	info:eu-repo/semantics/article
Enlaces:	We report an experimental-theoretical study of the energy-loss straggling of protons and alpha particles in HfO2 films. In the case of H ions the experiments were performed in the energy range 40–1750 keV. For the lower energy interval (40–250 keV)…
Fecha:	2012-11-28
Recurso:	RUA Docencia

Recurso libre

14.

Inelastic scattering of electron and light ion beams in organic polymers
Vera Gomis, Pablo de - Abril Sánchez, Isabel - García Molina, Rafael

Formato:	info:eu-repo/semantics/article
Enlaces:	We have calculated the inelastic mean free path, stopping power, and energy-loss straggling of swift electron, proton, and α-particle beams in a broad incident energy range in four organic polymers: poly(methyl methacrylate) (PMMA), Kapton, polyacetylene (PA), and poly(2-vinylpyridine) (P2VP). These…
Fecha:	2012-11-29
Recurso:	RUA Docencia

Recurso libre

15.

Simple model of bulk and surface excitation effects to inelastic scattering in low-energy electron beam irradiation of multi-walled carbon nanotubes
Kyriakou, Ioanna - Emfietzoglou, Dimitris - García Molina, Rafael - Abril Sánchez, Isabel - Kostarelos, Kostas

Formato:	info:eu-repo/semantics/article
Enlaces:	The effect of bulk and surface excitations to inelastic scattering in low-energy electron beam irradiation of multi-walled carbon nanotubes (MWNTs) is studied using the dielectric formalism. Calculations are based on a semiempirical dielectric response function for MWCNTs determined by means…
Fecha:	2012-11-29
Recurso:	RUA Docencia

Recurso libre

16.

The Canada-France Ecliptic Plane Survey—full data release: the orbital structure of the Kuiper Belt
Petit, Jean-Marc - Kavelaars, J. John - Gladman, Brett J. - Jones, R. Lynne - Parker, Joel Wm. - Van Laerhoven, Christa - Nicholson, Phil - Mars, Gilbert - Rousselot, Philippe - Mousis, Olivier - Marsden, Brian - Bieryla, Allyson - Taylor, Matthew - Ashby, Matthew L.N. - Benavídez, Paula Gabriela - Campo Bagatín, Adriano - Bernabeu Pastor, José Guillermo

Formato:	info:eu-repo/semantics/article
Enlaces:	We report the orbital distribution of the trans-Neptunian objects (TNOs) discovered during the Canada-France Ecliptic Plane Survey (CFEPS), whose discovery phase ran from early 2003 until early 2007. The follow-up observations started just after the first discoveries and extended until…
Fecha:	2013-11-13
Recurso:	RUA Docencia

Recurso libre

17.

Chandra and Suzaku observations of the Be/X-ray star HD110432
Torrejón Vázquez, José Miguel - Schulz, Norbert S. - Nowak, Michael A.

Formato:	info:eu-repo/semantics/article
Enlaces:	We present an analysis of a pointed 141 ks Chandra high-resolution transmission gratings observation of the Be X-ray emitting star HD110432, a prominent member of the γ Cas analogs. This observation represents the first high-resolution spectrum taken for this source…
Fecha:	2013-11-13
Recurso:	RUA Docencia

Recurso libre

18.

Influences of recording geometry parameters on diffraction efficiency in bleached silver halide transmission holograms
Beléndez Vázquez, Augusto - Pascual Villalobos, Inmaculada - Fimia Gil, Antonio

Formato:	info:eu-repo/semantics/article
Enlaces:	The experimental results of diffraction efficiency as a function of the geometrical disposition of recording beams in bleached silver halide transmission thick-holographic gratings are presented. Two variables have been used to relate these results with certain geometric parameters. These variables…
Fecha:	2009-02-02
Recurso:	RUA Docencia

Recurso libre

19.

Silver halide sensitized gelatin holograms in Slavich PFG-01 red-sensitive emulsion
Beléndez Vázquez, Augusto - Neipp López, Cristian - Pascual Villalobos, Inmaculada

Formato:	info:eu-repo/semantics/article
Enlaces:	Silver halide sensitized gelatin (SHSG) is an interesting technique for the production of holographic optical elements. It combines the high sensitivity of photographic emulsions with the well-known low scattering and high diffraction efficiency corresponding to dichromated gelatin. In this paper…
Fecha:	2009-02-02
Recurso:	RUA Docencia

Recurso libre

20.

Bleached silver halide volume holograms recorded on Slavich PFG-01 emulsion: the influence of the developer
Neipp López, Cristian - Pascual Villalobos, Inmaculada - Beléndez Vázquez, Augusto

Formato:	info:eu-repo/semantics/article
Enlaces:	Bleached holograms are one of the most interesting techniques used to produce phase holograms of high quality on photographic emulsions. Of particular interest is the method of fixation-free rehalogenating bleaching. In this paper we will study the influence of the…
Fecha:	2009-02-02
Recurso:	RUA Docencia

Recurso libre

21.

Optimization of a fixation-free rehalogenating bleach for BB-640 holographic emulsion
Neipp López, Cristian - Pascual Villalobos, Inmaculada - Beléndez Vázquez, Augusto

Formato:	info:eu-repo/semantics/article
Enlaces:	Fixation-free rehalogenating bleaching is an interesting for the production of phase holograms. The shrinkage of the emulsion is reduced in comparison with other bleaching methods (reversal bleaching or rehalogenating bleaching with fixation). In this paper we present experimental results for…
Fecha:	2009-02-03
Recurso:	RUA Docencia

Recurso libre

22.

High-energy sensitivity enhancement in panchromatic photopolymers for holography using a mixture of visiblelight photoinitiators
Fimia Gil, Antonio - Mateos Álvarez, Felipe - Mallavia Marín, Ricardo - Blaya Escarre, Salvador - Beléndez Vázquez, Augusto - Sastre Muñoz, Roberto - Amat Guerri, Francisco

Formato:	info:eu-repo/semantics/article
Enlaces:	A new aqueous photopolymer containing the monomers acrylamide, N,N'-methylenbisacrylamide and zinc acrylate, the initiators 4,5-diiodosuccinylfluorescein (2ISF) and methylene blue (MB), and the coinitiator sodium p-toluenesulphinate is described. This formulation exhibits a clear enhancement of the high-energy sensitivity upon irradiation with…
Fecha:	2009-02-03
Recurso:	RUA Docencia

Recurso libre

23.

Corrigendum to “Solution of the relativistic (an)harmonic oscillator using the harmonic balance method” [J. Sound Vib. 311 (2008) 1447–1456]
Beléndez Vázquez, Augusto - Pascual Villalobos, Carolina - Méndez Alcaraz, David Israel - Neipp López, Cristian

Formato:	info:eu-repo/semantics/article
Enlaces:	Descripción completa.
Fecha:	2009-02-02
Recurso:	RUA Docencia

Recurso libre

24.

Linearization of conservative nonlinear oscillators
Beléndez Vázquez, Augusto - Álvarez López, Mariela Lázara - Fernández Varó, Elena - Pascual Villalobos, Inmaculada

Formato:	info:eu-repo/semantics/article
Enlaces:	A linearization method of the nonlinear differential equation for conservative nonlinear oscillators is analyzed and discussed. This scheme is based on the Chebyshev series expansion of the restoring force which allows us to obtain a frequency-amplitude relation which is valid…
Fecha:	2009-01-26
Recurso:	RUA Docencia

Recurso libre

25.

Imaging in white light with a thick-phase transmission holographic doublet
Beléndez Vázquez, Augusto - Pascual Villalobos, Inmaculada - Fimia Gil, Antonio

Formato:	info:eu-repo/semantics/article
Enlaces:	An afocal two-element holographic imaging system is presented. This system can be used to work in white light. The holographic optical elements (holographic lenses) are made as thick phase holograms on silver halide sensitized gelatin (SHSG) and they present a…
Fecha:	2009-01-30
Recurso:	RUA Docencia

Recurso libre

26.

Solution of the relativistic (an)harmonic oscillator using the harmonic balance method
Beléndez Vázquez, Augusto - Pascual Villalobos, Carolina - Méndez Alcaraz, David Israel - Neipp López, Cristian

Formato:	info:eu-repo/semantics/article
Enlaces:	The harmonic balance method is used to construct approximate frequency–amplitude relations and periodic solutions to the relativistic oscillator. By combining linearization of the governing equation with the harmonic balance method, we construct analytical approximations to the oscillation frequencies and periodic…
Fecha:	2009-01-29
Recurso:	RUA Docencia

Recurso libre

27.

Theoretical and experimental analysis of overmodulation effects in volume holograms recorded on BB-640 emulsions
Neipp López, Cristian - Pascual Villalobos, Inmaculada - Beléndez Vázquez, Augusto

Formato:	info:eu-repo/semantics/article
Enlaces:	Kogelnik's coupled-wave theory has provided a well-established basis for understanding how light propagates inside a volume hologram, giving an accurate approximation of the diffraction efficiency in this type of hologram. In this paper we elaborate on some aspects of the…
Fecha:	2009-01-30
Recurso:	RUA Docencia

Recurso libre

28.

An integrated project for teaching the post-buckling of a slender cantilever bar
Beléndez Vázquez, Tarsicio - Neipp López, Cristian - Beléndez Vázquez, Augusto

Formato:	info:eu-repo/semantics/article
Enlaces:	We describe an integrated project that includes theoretical, numerical and experimental studies designed to facilitate teaching the non-linear post-buckling of a cantilever column to undergraduate mechanical engineering students. We present the differential equation governing the behaviour of this mechanical system…
Fecha:	2009-03-10
Recurso:	RUA Docencia

Recurso libre

29.

Mixed phase-amplitude holographic gratings recorded in bleached silver halide materials
Neipp López, Cristian - Pascual Villalobos, Carolina - Beléndez Vázquez, Augusto

Formato:	info:eu-repo/semantics/article
Enlaces:	The coupled wave theory of Kogelnik has given a well-established basis for the comprehension of how light propagates inside a volume hologram. This theory gives a good approximation for the diffraction efficiency of both volume phase holograms and volume absorption…
Fecha:	2009-01-30
Recurso:	RUA Docencia

Recurso libre

30.

Comparative study of bleaches applied to BB-640 plates
Neipp López, Cristian - Condeza, Shirley - Campos, Ana María - Pascual Villalobos, Inmaculada - Beléndez Vázquez, Augusto

Formato:	info:eu-repo/semantics/article
Enlaces:	The use of bleaching techniques is perhaps one of the most popular methods of creating phase holograms from holographic emulsions. In this paper we will study the influence of the different experimental conditions on the refractive index modulation created inside…
Fecha:	2009-01-30
Recurso:	RUA Docencia

Recurso libre

31.

Low spatial frequency characterization of holographic recording materials applied to correlation
Márquez Ruiz, Andrés - Neipp López, Cristian - Beléndez Vázquez, Augusto - Campos Coloma, Juan - Yzuel Giménez, María Josefa - Fimia Gil, Antonio

Formato:	info:eu-repo/semantics/article
Enlaces:	Accurate recording of computer-generated holograms (CGH) on a phase material is not a trivial task. The range of available phase materials is large, and their suitability depends on the fabrication technique chosen to produce the hologram. We are particularly interested…
Fecha:	2009-01-30
Recurso:	RUA Docencia