Sample records for EFECTO HALL (hall effect)
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1

Impedancia longitudinal de un gas bidimensional de electrones en régimen de efecto Hall cuántico

Hernández, C.; Chaubet, C.
2009-12-01

Resumen en español Se realizaron mediciones de impedancia en un gas bidimensional de electrones en régimen de efecto Hall cuántico. Encontramos resonancias en la medida de impedancia, débiles a nivel de los plateaus cuantizados y muy agudas para cada principio y final de plateau. Estas resonancias las podemos describir parcialmente usando un modelo simplificado del circuito eléctrico. A partir del análisis de los resultados experimentales queda clara la gran influencia del sistema de mediciones sobre los resultados experimentales. Resumen en inglés We have measured the longitudinal impedance of a two dimensional electron gas in the quantum Hall effect regime. We have found smooth resonances of impedance for the middle of quantized plateaus and large resonances at the beginning and the end of the plateaus. Those resonances can be partially described using a simplified electrical circuit model. The analysis of the different experimental results shows a great influence of the experimental setup on the experimental measurements.

Scientific Electronic Library Online (Spanish)

2

Development of a model to predict the durability of reinforced concrete structures in marine environment/ Desarrollo de un modelo para predecir la durabilidad de estructuras de concreto armado en medios marinos

Morón, Oleyda; de Rincón, Oladis; García, Cézar; Arrieta, Idelfonso; Bravo, José
2003-08-01

Resumen en español Este trabajo tiene como finalidad proponer un modelo que permita estimar la durabilidad de estructuras de concreto armado expuestas a un ambiente marino. A tal efecto, se utilizaron diferentes modelos propuestos por la literatura, donde el coeficiente de difusión es función de la concentración, partiendo de que el proceso de transferencia de los iones cloruro es controlado por un flujo puramente difusional. Un total de 44 núcleos de concreto sirvieron como base para e (mas) sta investigación. Así, se utilizaron los resultados de contaminación de iones cloruro determinados en diferentes elementos del Puente General Rafael Urdaneta (PGRU), estructura de concreto de 39 años en servicio. El PGRU se encuentra frente al Mar Caribe con condiciones ambientales marinas agresivas. Los resultados indican que no existe un modelo único que se aplique a toda la estructura evaluada, para los criterios de valoración asumidos en la selección de los modelos, sino que, en general dependen de la calidad del concreto (igual modelo para un mismo elemento). Sin embargo, fue el modelo de Hall el que mostró el mejor ajuste a los resultados (70% de los casos). Además se observó que la calidad del concreto tiene un marcado efecto sobre la difusión del ión cloruro y que en general el coeficiente de difusión se ve más afectado por agentes externos que por la variación de la concentración dentro del concreto. Resumen en inglés This paper proposes a model that enable to estimate the durability of reinforced concrete structures exposed to marine environment. To that effect, different models proposed by the literature were used, where the diffusion coefficient is function of the concentration, departing of the fact that the transfer process of the chloride ions is controlled by purely diffusion flow. A total of 44 concrete nucleus served as base for this research. Thus, the results of chloride ion (mas) s contamination determined in different elements of the General Rafael Urdaneta Bridge (PGRU) were used. The PGRU, a 39 year structure, is located front Caribbean Sea with a very aggresive environmental condition. The results indicate that it does not exist an unique model that is applied to all the evaluated structure, for the valuation criteria assumed in the selection of the models, but, as a rule depend on the quality of the concrete (equal model for a same element). However, the Hall´s model was the one which fit better to the results (70% of the cases).

Scientific Electronic Library Online (Spanish)

3

La construcción de sentido: el caso de los enunciados metafóricos y el discurso académico/ The Construction of Sense: The Case of Metaphoric Utterance in Academic Discourse

Hall, Beatriz
2010-06-01

Resumen en español En las últimas décadas, el discurso académico se ha convertido en objeto de estudio de numerosas investigaciones que, a partir de diferentes marcos teóricos, se proponen distintos objetivos. Por otra parte, si bien la llamada metáfora ha sido motivo de reflexión teórica desde la antigüedad, en los últimos años la cantidad y variedad de estudios que se han desarrollado y siguen desarrollándose en torno a este objeto de estudio ha aumentado considerablemente. En (mas) tal contexto de múltiples propuestas teóricas y metodológicas, este trabajo tiene por objetivo demostrar que, tanto el estudio de la metáfora como el del discurso académico, involucra decisivamente conceptos que no siempre aparecen explicitados. Nos referimos, entre otros, a los conceptos de lengua, sujeto, sentido, sentido literal y sentido metafórico. Por nuestra parte, desde un punto de vista semántico discursivo no referencialista de la lengua (Schulz, 2000; 2002; 2004), recogemos los aportes provenientes del Análisis del Discurso (línea francesa-brasileña). Así, partimos de la definición de discurso como efecto de sentido entre locutores y lo estudiamos en su relación constitutiva con las condiciones de producción. Entendemos que las condiciones de producción y circulación de los textos se materializan en mecanismos discursivos, según las representaciones imaginarias de los sujetos. De acuerdo con esta línea investigativa, finalmente, proponemos caracterizar las llamadas metáforas como construcciones semánticas insertas en una dinámica discursiva y, en este sentido, las redefinimos como enunciados metafóricos. Resumen en inglés In recent decades academic discourse has changed into an object of study of numerous investigations that, starting from different theoretical frameworks, propose different objectives. n the other hand, if the so-called metaphor has been the motive of theoretical reflection since ancient times, in recent years the quantity and variety of studies that have been developed and continue to be developed around this object of study have risen considerably. In such a context of m (mas) ultiple theoretical and methodological proposals, this work has as its objective to demonstrate that both the study of metaphor and that of academic discourse decisively involve concepts that don't always appear to be explicitated. We are referring to, among others, the concepts of language, subject, meaning, literal meaning, and metaphorical meaning. or our part, from a semantic discursive non referentialist point of view of language (Schulz, 2000; 2002; 2004) we gather the contributions from Discourse Analysis (the French-Brazilian variety). hus we start from the definition of discourse as a meaning effect between speakers and we study it in its constitutive relationship with the production conditions. e understand that the production conditions and circulation of texts materialize in discursive mechanisms according to the imaginary representations of the subjects. inally in accordance with this investigative line we propose characterizing the so-called metaphors as semantic constructions inserted in discursive dynamics and in this sense, we redefine them as metaphoric utterances.

Scientific Electronic Library Online (Spanish)

4

Zeeman energy and anomalous spin splitting in lateral GaAs quantum dots

Valín-Rodríguez, Manuel; Puente, Antonio; Serra, Llorenç

5 pages (final publisher version).-- 6 pages, 6 figures (attached post-print version).-- PACS nrs.: 73.21.La, 73.21.-b.-- Pre-print version available at ArXiv: http://arxiv.org/abs/cond-mat/0403202v1. | The level splittings induced by a horizontal magnetic field in a parabolic two-dimensional quantu...

DRIVER (Spanish)

5

Zeeman energy and anomalous spin splitting in lateral GaAs quantum dots

Valín-Rodríguez, Manuel; Puente, Antonio; Serra, Llorenç
2004-12-01

Digital.CSIC (Spain)

6

The electronic properties of graphene

Neto, A. H. Castro; Guinea, F.; Peres, N. M. R.; Novoselov, K. S.; Geim, A. K.
2009-01-14

Digital.CSIC (Spain)

7

Syntheses and quadratic nonlinear optical properties of salts containing benzothiazolium electron-acceptor groups

Coe, Benjamin J.; Harris, James A.; Hall, Jonathan J.; Brunschwig, Bruce S.; Hung, Sheng-Ting; Libaers, Wim; Clays, Koen; Coles, Simon J.; Horton, Peter N.; Light, Mark E.; Hursthouse, Michael B.; Garín, Javier; Ordun, Jesús
2006-11-11

Digital.CSIC (Spain)

8

Raman scattering study of the long-wavelength longitudinal-optical-phonon–plasmon coupled modes in high-mobility InN layers

Cuscó, Ramón; Ibáñez, Jordi; Alarcón-Lladó, Esther; Artús, Lluís; Yamaguchi, Tomohiro; Nanishi, Yasushi
2009-04-01

Digital.CSIC (Spain)

9

Raman scattering study of background electron density in InN: a hydrodynamical approach to the LO-phonon–plasmon coupled modes

Cuscó, Ramón; Alarcón-Lladó, Esther; Ibáñez, Jordi; Yamaguchi, Tomohiro; Nanishi, Yasushi; Artús, Lluís
2009-10-01

Digital.CSIC (Spain)

10

Quantum dots based on spin properties of semiconductor heterostructures

Valín-Rodríguez, Manuel; Puente, Antonio; Serra, Llorenç

4 pages (final publisher version), 9 pages, 3 figures (attached post-print version).-- PACS nrs.: 73.21.La, 73.21.-b.-- Pre-print version available at ArXiv: http://arxiv.org/abs/cond-mat/0311077. | The possibility of a type of semiconductor quantum dots obtained by spatially modulating the spin-orb...

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11

Quantum dots based on spin properties of semiconductor heterostructures

Valín-Rodríguez, Manuel; Puente, Antonio; Serra, Llorenç
2004-03-18

Digital.CSIC (Spain)

12

Pulsed Laser Melting Effects on Single Crystal Gallium Phosphide

Pastor, D.; Olea, J.; Toledano-Luque, M.; Mártil, I.; González-Díaz, G.; Ibáñez, Jordi; Cuscó, Ramón; Artús, Lluís
2009-03-01

Digital.CSIC (Spain)

13

Magnetotransport properties of oxidized iron thin films

Stankiewicz, Jolanta; Jiménez-Villacorta, Félix; Prieto, Carlos
2006-01-01

Digital.CSIC (Spain)

15

Landau levels and Riemann zeros

Sierra, Germán; Townsend, Paul K.

4 pages, 2 figures.-- PACS numbers: 02.10.De, 05.45.Mt.-- ArXiv pre-print available at: http://arxiv.org/abs/0805.4079 | The number N(E) of complex zeros of the Riemann zeta function with positive imaginary part less than E is the sum of a `smooth' function Ñ(E) and a 'fluctuation'. Berry and Keatin...

DRIVER (Spanish)

16

Landau levels and Riemann zeros

Sierra, Germán; Townsend, Paul K.
2008-09-12

Digital.CSIC (Spain)

17

Intertwined magneto-optical and plasmonic effects in Ag/Co/Ag layered structures

Ferreiro Vila, E.; González Díaz, Juan Bautista; Fermento, Rui; González, María Ujué; García-Martín, Antonio; García-Martín, José Miguel; Cebollada, Alfonso; Armelles Reig, Gaspar
2009-09-30

Digital.CSIC (Spain)

18

Explaining the Transitions Out of Unemployment in Spain: The Effect of Unemployment Insurance

Alba, Alfonso [alalba]

A multinomial logit model and matched files from the Spanish Active Population Survey (EPA) are used to study transitions out of unemployment among men aged 20-59. In addition to demographic characteristics, other explanatory variables included in the regressions pertain to previous job characterist...

DRIVER (Spanish)

20

Electron effective mass and mobility in heavily doped n-GaAsN probed by Raman scattering

Ibáñez, Jordi; Cuscó, Ramón; Alarcón-Lladó, Esther; Artús, Lluís; Patanè, A.; Fowler, D.; Eaves, L.; Uesugi, K.; Suemune, I.
2008-08-01

Digital.CSIC (Spain)

21

Electrical and optical properties of Be doped InP grown at low temperature by solid source atomic layer molecular beam epitaxy

Postigo, Pablo Aitor; Dotor, María Luisa; Huertas, P.; García, Fernando; Golmayo, Dolores; Briones Fernández-Pola, Fernando
1999-01-01

Digital.CSIC (Spain)

22
23

Current-induced cleaning of graphene

Moser, Joel; Barreiro, Amelia; Bachtold, Adrian

3 pages, 4 figures.-- PACS nrs.: 81.05.Uw, 81.65.Cf, 68.35.Dv, 68.43.Mn, 73.43.Fj.-- ArXiv pre-print available at: http://arxiv.org/abs/0709.0607 | A simple yet highly reproducible method to suppress contamination of graphene at low temperature inside the cryostat is presented. The method consists o...

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24

Current-induced cleaning of graphene

Moser, Joel; Barreiro, Amelia; Bachtold, Adrian
2007-10-19

Digital.CSIC (Spain)

25

Children's Gestures from 18 to 30 months

Andrén, Mats

This thesis concerns the nature of the gestures performed by five Swedish children. The children are followed from 18 to 30 months of age: an age range which is characterized by a rapid succession of developmental changes in children's abilities to communicate by means of both spoken language and ge...

DRIVER (Spanish)

26

Biased Bilayer Graphene: Semiconductor with a Gap Tunable by the Electric Field Effect

Castro, Eduardo V.; Novoselov, K. S.; Morozov, S. V.; Peres, N. M. R.; Lopes dos Santos, J. M. B.; Nilsson, Johan; Guinea, F.; Geim, A. K.; Castro, A.
2007-11-23

Digital.CSIC (Spain)

27

Anomalous Hall effect in Fe (001) epitaxial thin films over a wide range in conductivity

Sangiao, S.; Morellón, Luis; Simón, G.; Teresa, José María de; Pardo, J. A.; Arbiol, J.; Ibarra, Ricardo

5 pages, 5 figures.-- PACS nrs.: 75.47.-m; 73.50.Jt; 75.50.Bb.-- ©2009 The American Physical Society. | We report Hall-effect measurements of epitaxial Fe (001) thin films grown on MgO (001). We have focused on the dependence of the anomalous Hall effect (AHE) in heteroepitaxial structures MgO (001...

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28

Anomalous Hall effect in Fe (001) epitaxial thin films over a wide range in conductivity

Sangiao, S.; Morellón, Luis; Simón, G.; Teresa, José María de; Pardo, J. A.; Arbiol, J.; Ibarra, M. Ricardo
2009-01-23

Digital.CSIC (Spain)

29

Analysis of alcohol ethoxylates and alkylamine ethoxylates in agricultural soils using pressurised liquid extraction and liquid chromatography-mass spectrometry

Krogh, Kristine A.; Mogensen, Betty Bügel; Halling-Sørensen, Bent; Cortés, Amparo; Vejrup, Karl V.; Barceló, Damià
2003-08-07

Digital.CSIC (Spain)