Sample records for SISTEMAS OPTICOS (optical systems)
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1

Óptica difractiva: una revisión al diseño y construcción de sistemas ópticos empleando lentes difractivas

Castro-Ramos, J; Vázquez-Montiel, S; Hernández-de-la-Cruz, J; García-Lievanos, O; Calleja-Arriaga, W
2006-12-01

Resumen en español Hoy en día la optica difractiva está teniendo un gran auge en la construcción de sistemas ópticos formadores de imagen, debido principalmente a las ventajas que se obtienen en la calidad de la imagen y al empleo de una menor cantidad de elementos ópticos. Así, los elementos ópticos difractivos (EOD) han alcanzado un gran impacto que va en incremento día a día; una clara muestra son los artículos científicos de investigación y divulgación [1-3] que han apareci (mas) do por parte de compañías transnacionales como CANON, KODAK y NYKON, entre otras, las cuales mencionan una gran cantidad de proyectos en los que planean construir y evaluar cámaras digitales, proyectores de cristal líquido y otros equipos formadores de imagen, todo ello mediante el empleo de EOD. Bajo el contexto anterior se plantea en este artículo hacer una revisión de los fundamentos en los que se basa la óptica difractiva, los métodos que se utilizan para diseñar los sistemas ópticos empleando elementos ópticos difractivos, así como la descripcion de las técnicas más comunes para su fabricación y el empleo que tienen estos sistemas opticos. Resumen en inglés Nowadays diffractive optics in the fabrication of imaging optical systems is having a boom due to many advantages over the image quality and the use of less optical elements. Diffractive Optical Elements (DOE's) are showing a huge growth in the optical industry and it goes in increasing day to day. Transnational companies like CANON, KODAK and NYON refer to great quantity of projects for building imaging equipment, digital cameras; liquid crystal projectors among others b (mas) y means of using DOE's, already their results have been appearing in a lot of published papers and technical reports [1-3]. Due to above written, a review on fundamental concepts in which the diffractive optics is based is explained. The methods employed to design optical systems by using diffractive optical elements are check over, the most common techniques to produce such elements are also reviewed. Finally some applications based on DOE's are explored in this paper.

Scientific Electronic Library Online (Spanish)

2

FIBRA MICRO-ESTRUCTURADA PARA LA COMPENSACIÓN DE LA DISPERSIÓN CROMÁTICA EN SISTEMAS DE COMUNICACIONES ÓPTICAS/ MICRO-STRUCTURED FIBER FOR CHROMATIC DISPERSION COMPENSATION IN OPTIC COMMUNICATION SYSTEMS

ARISTIZABAL, VICTOR H.
2009-12-01

Resumen en español En este trabajo se analiza una fibra óptica micro-estructurada que presenta un pico de dispersión anómala aproximadamente de -5800 ps/(nm-km) alrededor 1.547 mm, haciéndola ideal para propósitos de compensación en la tercera ventana de los sistemas ópticos de comunicaciones. Esta fibra especial consiste en un medio homogéneo de Sílice de alta pureza con huecos de aire de diámetros diferentes, dispuestos en siete anillos hexagonales que se mantienen a lo largo de (mas) la estructura. Para el análisis se utilizó el método de los elementos finitos debido a que exhibe una estructura compleja donde el tratamiento analítico no es posible. Resumen en inglés In this work, a micro-structured fiber features a peak of anomalous dispersion about -5800 ps/(nm-km) around 1.547 mm is analyzed. It is ideal for compensation purposes in the third window of the optical communications. This special fiber consisting of a homogeneous Silica region with different diameter air-holes, they are arranged at seven hexagonal rings that run along the length of the structure. For the analysis the finite elements method was utilized due to it exhibit a complex structure where analytic treatment is impossible.

Scientific Electronic Library Online (Spanish)

3

EFECTOS DE LA MODULACIÓN DE FASE CRUZADA SOBRE LA PROPAGACIÓN DE ONDAS EN FIBRA ÓPTICA

Saavedra G, Fideromo; Lamas N, Álvaro; Fernández B, Marco; Cepeda P, Yonatan
2005-12-01

Resumen en español La modulación de fase cruzada (XPM) es un importante fenómeno que limita el desempeño de los sistemas ópticos de alta velocidad. En este trabajo se analizan y realizan tres modelos matemáticos diferentes que nos permiten comprobar y determinar las dependencias de XPM con respecto a la dispersión cromática de la fibra, la separación entre las longitudes de ondas, la potencia y la frecuencia de modulación Resumen en inglés The cross-phase modulation (XPM) is an important phenomenon that limits the performance of the high speed optical systems. In this work three different mathematical models are analyzed and realiced, that they allow to verify and to determine the dependencies of XPM with respect to the chromatic dispersion of the fiber, the separation between the wavelengths, the power and the modulating frequency

Scientific Electronic Library Online (Spanish)

4

Empleo del tratamiento matricial en el curso de óptica: sistema de lentes/ Using the matrix method in optics: system of lenses

Fuentes Betancourt, J.; Hidalgo Alonso, O.; Calzadilla Amaya, O.; Perez Perdomo, A.
2005-09-01

Resumen en español En la enseñanza del curso de óptica, en la Licenciatura en Física, los estudiantes poseen conocimientos y habilidades operacionales de programas de cómputo, además de conocimientos de Álgebra Lineal, sobre la operación con matrices y determinantes. El método matricial, se emplea ampliamente en el análisis de fenómenos ópticos, aprovechando que muchos sistemas ópticos son susceptibles de ser descritos satisfactoriamente en la aproximación de modelos lineales. (mas) En el presente trabajo se describe el experimento didáctico realizado con la integración de conocimientos de Álgebra, Computación y óptica aplicados a la solución, por medio del método matricial, del diseño de un triplete de Cooke usado en cámaras fotográficas. Se obtiene un buen aprovechamiento por los estudiantes que logran profundizar en el tema lográndose la integración de los conocimientos propuesta inicialmente. Resumen en inglés Undergraduate Physics majors have usually developed knowledge and operational abilities in Linear Algebra, particularly determinants and matrices, and in the use of software. The matrix method is used thoroughly in the analysis of optical phenomena, making good use of that fact so that many optical systems can be satisfactorily describe by linear models. A didactic experiment which integrates knowledge from Algebra, Computers and Optics to design of a Cooke's triplet used (mas) in photographic cameras base on the matrix method, is described in the present work. The students manage to integrate previous knowledge during the problem solving, as initially proposed.

Scientific Electronic Library Online (Spanish)

5

EFECTOS DE LA DISPERSIÓN POR MODO DE POLARIZACIÓN (PMD) EN LA PROPAGACIÓN DE PULSOS A TRAVÉS DE FIBRAS ÓPTICAS/ EFFECTS OF POLARIZATION MODE DISPERSION (PMD) ON PROPAGATION OF OPTICAL PULSES IN OPTICAL FIBERS

Leiva L, Ariel; Tarifeño G, Marco; Olivares V, Ricardo
2007-12-01

Resumen en español En este trabajo se revisan los conceptos fundamentales de la dispersión por modo de polarización (PMD: Polarization Mode Dispersion) que ocurre en fibras ópticas. PMD produce ensanchamientos aleatorios de los pulsos ópticos transmitidos a través de una fibra óptica y su efecto es considerable para velocidades de transmisión digital iguales o superiores a 10 Gbps. Se revisa la teoría de PMD y se plantea la relevancia de caracterizar el fenómeno en transmisión por (mas) fibra óptica, concluyéndose con un método de simulación de la propagación de pulsos afectados por PMD. Este trabajo constituye un punto de partida para posteriores análisis de los efectos de PMD en sistemas de transmisión, para su compensación y medición Resumen en inglés This work reviews the fundamental concepts of polarization mode dispersion (PMD) occurring in optical fibers. PMD broadens optical pulses transmitted through an optical fiber at random and its effect is significant for bit rates equal or exceeding 10 Gbps. The theory of PMD and relevance of characterizing this phenomenon in optical fiber transmission is presented, concluding with a simulation model of the optical pulse propagation, subject to PMD. This provides a starting point for further analysis of the effects of PMD in transmission systems and how to measure and compensate these

Scientific Electronic Library Online (Spanish)

6

Utilidad de las imágenes de banda angosta (N.B.I) en la endoscopia diagnóstica/ Usefulness of the narrow band image (N.B.I) in the diagnostic endoscopy

Ospina Nieto, John; Villamizar Suárez, John
2009-03-01

Resumen en español El NBI (Narrow Band Imaging) o imagen de banda angosta es una herramienta de visualización endoscópica desarrollada en Japón en el National Cancer Center por los doctores Gono K. y Sano Y., en el año 2001. Esta "cromoendoscopia digital", aunada a los sistemas de magnificación endoscópicos permite una valoración más detallada de la superficie mucosa y de su patrón vascular, facilitando de esta manera el diagnóstico y seguimiento de lesiones tempranas del tracto g (mas) astrointestinal, así como el de patologías premalignas como el esófago de Barrett, el cáncer, los pólipos y la enfermedad inflamatoria intestinal, entre otras. En el presente artículo se expone una revisión de los principios ópticos del NBI y de la utilidad del mismo en la endoscopia diagnóstica y terapéutica de rutina y la experiencia con la misma en nuestra institución (Hospital Cardiovascular del niño de Cundinamarca). Resumen en inglés The NBI (Narrow Band Imaging) or image of narrow band is a tool of endoscopic visualization developed in Japan in the National Cancer Center for the Drs. Gono K. and Sano Y. in the year 2001. This "digital Chromoendoscopy" linked to the systems of magnification endoscope allows a more detailed evaluation of the mucous surface and of its vascular net, facilitating hereby the diagnosis and follow-up of early injuries of the gastrointestinal tract, as well as of pathologies (mas) as Barrett’s oesophagus, the cancer, the polyps and the inflammatory intestinal disease, among others. In this article we expose a review of the optical principles of the NBI and of the utility of the same one in the routine diagnoses and therapeutic endoscopy and the experience with the same one in our institution (Cardiovascular Hospital of the child of Cundinamarca).

Scientific Electronic Library Online (Spanish)

7

Identificación biométrica utilizando imágenes infrarrojas de la red vascular de la cara dorsal de la mano/ Biometric identification using infrared dorsum hand vein images

Motato Toro, Óscar Fernando; Loaiza Correa, Humberto
2009-04-01

Resumen en español La necesidad manifiesta de mejorar los controles de acceso y seguridad han orientado el diseño de los nuevos sistemas de identificación personal hacia la utilización de rasgos biométricos, fisiológicos y comportamentales, que garanticen niveles de desempeño cada vez más altos. Con esta motivación, se presenta el desarrollo y evaluación de un sistema computacional para realizar los procedimientos de registro y validación de identidad de personas utilizando imáge (mas) nes de las venas de la cara dorsal de la mano, compuesto por un módulo hardware de bajo costo para la adquisición de imágenes infrarrojas, utilizando una cámara de video convencional, lentes ópticos, fuentes de iluminación infrarroja controladas y un frame grabber; y un módulo software para la visualización y captura de las imágenes, selección de las regiones de interés, segmentación y extracción, descripción y clasificación de características. Finalmente, para evaluar la similitud entre las imágenes se implementa y evalúa una etapa basada en redes neuronales artificiales, permitiendo concluir que el indicador biométrico es lo suficientemente discriminante, y otra basada en correlación que, sobre una base de datos de 100 imágenes, determina la eficiencia máxima de sistema en 95,72% en un umbral igual a 65%, y 8,57% y 0% para las tasas de falsa aceptación (FAR) y falso rechazo (FRR) respectivamente. Resumen en inglés The evident need for improving access and safety controls has orientated the development of new personal identification systems towards using biometric, physiological and behavioral features guaranteeing increasing greater levels of performance. Motivated by this trend, the development and implementation of a computational tool for recording and validating people’s identity using dorsum hand vein images is presented here. A low-cost hardware module for acquiring infrared (mas) images was thus designed; it consisted of a conventional video-camera, optical lenses, controlled infrared illumination sources and a frame grabber. The accompanying software module was concerned with visualizing and capturing images, selecting regions of interest, pattern segmentation in the region and extracting, describing and classifying these features. An artificial neuron network approach was implemented for pattern recognition, resulting in it proving the biometric indicator to be sufficiently discriminating, and a correlation-based approach using a 100 image database for static characterisation, determined the system’s maximum efficiency to be 95.72% at a threshold equal to 65. False acceptance rate (FAR) was 8.57% and false rejection rate (FRR) was 0% at this threshold.

Scientific Electronic Library Online (Spanish)

8

Ensayo in vitro para detectar la presencia de agentes adventicios en un banco de células de trabajo/ In vitro assay to determine the presence of adventitious agents in a Working Cell Bank

Pardo, Georgina; Almora, Ernesto; Fidalgo, Odalys; Zamora, Arelys; Rodríguez, Niurka; Pérez, Ela María
2001-03-01

Resumen en español Actualmente las colecciones de cultivos de tejidos son consideradas valiosas fuentes de material biológico para la investigación, diagnóstico y producción, sin embargo se hacen realmente útiles cuando las mismas están bien organizadas, caracterizadas y manipuladas como Bancos Celulares Maestros y de Trabajo, en dependencia de la dirección de los objetivos de trabajo. Las agencias reguladoras en todo el mundo consideran el establecimiento de Bancos Celulares Maestro (mas) s y de Trabajo siguiendo las Buenas Prácticas de Fabricación vigentes y los “Puntos a Considerar en la Caracterización de Líneas Celulares utilizadas en la Producción de Biológicos”. El objetivo de este trabajo fue determinar que un Banco Celular de Trabajo (BCT) obtenido en nuestro laboratorio estaba libre de agentes adventicios, para lo cual se realizó la observación a través del microscopio óptico y electrónico para visualizar morfología y presencia de retrovirus, se verificó la ausencia de contaminación bacteriana, fúngica y de micoplasmas; además se buscó presencia de otros agentes adventicios utilizando tres sistemas de cultivo celular. La morfología de las células fue seudofibroblástica como está reportado para esta línea, el Banco Celular está exento de bacterias, hongos y micoplasmas y los resultados de la prueba de agentes extraños fueron negativos, la observación al microscopio electrónico no reveló partículas tipo A y tipo C de retrovirus. Como conclusión podemos decir que el Banco Celular de Trabajo cumple con las regulaciones establecidas y pudiera ser empleado en la producción de vacunas veterinarias. Resumen en inglés At present tissue culture collections are considered valuable sources of biological material for research and production, nevertheless they are really useful when they are well organized, characterized and handled as Master Cell Banks and Working Cell Banks, depending on the objectives of the work. Regulatory agencies all over the world consider that the establishment of Master Cell Banks and Working Cell Banks follows good manufacturing practices in effect and the “ (mas) ;Points to consider in the Characterization of Cell Lines used for the Production of Biologicals”. The objective of this work was to determine if a Working Cell Bank (WCB) obtained in our laboratory was free of adventitious agents. To achieve this, optical and electronic microscopy were carried out looking for the morphology or presence of retrovirus. Absence of bacterial, fungi and micoplasma contamination was also verified. Also the presence of other adventitious agents tested using three cell culture systems. The cell morphology was pseudo fibroblastic as reported for this cell line. The Cell Bank is free of bacteria, fungi and micoplasma. The results of the test for adventitious agents were negative, electronic microscopy observation didn’t reveal type A or C retroviral particles. As a conclusion we may say that the Working Cell Bank complies with the regulations established and can be used in the production of veterinary vaccines.

Scientific Electronic Library Online (Spanish)

9

instrument for simulating multifocal ophthalmic corrections

Dorronsoro Día, Carlos; Marcos Celestino, Susana
2010-10-14

Digital.CSIC (Spain)

10

Two-frequency emission and polarization dynamics at lasing threshold in vertical-cavity surface-emitting lasers

Sondermann, M.; Weinkath, M.; Ackemann, T.; Mulet, Josep; Balle, Salvador

11 pages, 16 figures.-- PACS nrs.: 42.55.Px, 42.60.Mi, 42.65.Sf. | We investigate experimentally and theoretically the polarization dynamics in vertical-cavity surface-emitting lasers in the vicinity of the lasing threshold. If the net gain anisotropy between the two orthogonally polarized modes is ...

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11

Two-dimensional front dynamics and spatial solitons in a nonlinear optical system

Pesch, M.; Lange, Wulfhard; Gomila, Damià; Ackemann, Thorsten; Firth, William J.; Oppo, Gian-Luca

4 pages.-- PACS numbers: 42.65.Tg, 05.45.Yv, 42.65.Sf, 47.54.-r.-- Final full-text version of the paper available at: http://dx.doi.org/10.1103/PhysRevLett.99.153902.-- Auxiliary material (multimedia) available at: http://netserver.aip.org/cgi-bin/epaps?ID=E-PRLTAO-99-025742. | Two-dimensional front...

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12

Two-dimensional front dynamics and spatial solitons in a nonlinear optical system

Pesch, M.; Lange, Wulfhard; Gomila, Damià; Ackemann, Thorsten; Firth, William J.; Oppo, Gian-Luca
2007-10-12

Digital.CSIC (Spain)

13

Transition from hexagons to optical turbulence

Gomila, Damià; Colet, Pere

4 pages, 3 figures.-- PACS nrs.: 42.65.Sf, 47.20.Ky, 47.54.+r, 89.75.Kd. | We characterize the different dynamical regimes and bifurcations in the transition from a stationary hexagonal pattern to optical turbulence. In order to characterize the bifurcations we perform linear stability analysis of s...

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14
15

Trajectory occlusion handling with multiple view distance minimization clustering

Mozerov, Mikhail; Amato, Ariel; Roca i Marva, Francesc Xavier; Gonzàlez Sabaté, Jordi
2008-01-01

Digital.CSIC (Spain)

16

Thermo-optical canard-orbits and excitable limit cycles

Marino, Francesco; Catalán, Gustau; Sánchez, Pedro; Balle, Salvador; Piro, Oreste

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17

Thermo-optical canard-orbits and excitable limit cycles

Marino, Francesco; Catalán, Gustau; Sánchez, Pedro; Balle, Salvador; Piro, Oreste
2004-02-18

Digital.CSIC (Spain)

18

The optical links of the ATLAS SemiConductor tracker

Wilson, J. A.; Abdesselam, A.; Allport, P. P.; Apsimon, R. J.; Band, C.; Barr, A. J.; Batchelor, L.

28 pages, 17 figures.-- PACS nrs.: 42.88.+h, 04.40.Nr, 85.40, 85.60.-- ISI Article Identifier: 000253652000008.-- Open Access article at the publisher's site. | Optical links are used for the readout of the 4088 silicon microstrip modules that make up the SemiConductor Tracker of the ATLAS experimen...

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20

Synthesis, characterization and optical properties of merocyanines derived from malononitrile dimer

Alías, Silvia; Andreu, Raquel; Cerdán, Miguel Ángel; Franco, Santiago; Garín, Javier; Orduna, Jesús; Romero, Pilar; Villacampa, Belén
2007-09-10

Digital.CSIC (Spain)

21

Synchronization regimes of optical-feedback-induced chaos in unidirectionally coupled semiconductor lasers

Locquet, A.; Masoller, Cristina; Mirasso, Claudio R.

12 pages, 12 figures.-- PACS nrs.: 05.45.Xt, 42.55.Px, 42.65.Sf. | We numerically study the synchronization of two unidirectionally coupled single-mode semiconductor lasers in a master-slave configuration. The master laser is an external-cavity laser that operates in a chaotic regime while for the s...

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23

Synchronization properties of coupled semiconductor lasers subject to filtered optical feedback

Soriano, Miguel C.; Ruiz-Oliveras, Flavio; Colet, Pere; Mirasso, Claudio R.

8 pages, 16 figures.-- PACS nrs.: 05.45.Vx; 05.45.Gg; 42.65.Sf. | We study numerically the synchronization properties of two unidirectionally coupled semiconductor lasers subject to filtered optical feedback. By adding a perturbation (a message) to the output of the master laser, we show that mutual...

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24

Synchronization properties of coupled semiconductor lasers subject to filtered optical feedback

Soriano, Miguel C.; Ruiz-Oliveras, Flavio; Colet, Pere; Mirasso, Claudio R.
2008-10-30

Digital.CSIC (Spain)

25

Synchronization of vectorial noise-sustained structures

Izús, Gonzalo; Colet, Pere; San Miguel, Maxi; Santagiustina, Marco

6 pages, 4 figures.-- PACS nrs.: 05.45.Xt, 42.65.Sf, 42.65.Yj. | The synchronization of vectorial, noise-sustained structures in nonlinear optical systems is discussed. In particular, the analysis is made for nondegenerate optical parametric oscillators with walk off. The interplay between walk off ...

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26

Synchronization of vectorial noise-sustained structures

Izús, Gonzalo; Colet, Pere; San Miguel, Maxi; Santagiustina, Marco
2003-09-03

Digital.CSIC (Spain)

27

Synchronization Properties of Bidirectionally Coupled Semiconductor Lasers Under Asymmetric Operating Conditions

Martínez Ávila, Jhon Fredy; Vicente, Raúl; Rios Leite, José R.; Mirasso, Claudio R.

6 pages.-- PACS numbers: 05.45.Xt, 42.55.Px, 42.65.Sf.-- Final full-text version of the paper available at: http://dx.doi.org/10.1103/PhysRevE.75.066202. | We study, both experimentally and numerically, a system of two coupled semiconductor lasers in an asymmetric configuration. A laser subject to o...

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28

Strategies for introducing non-radioactive labels during the automated sequence analysis of nucleic acids.

Igloi, Gabor L
1998-04-01

Resumen en inglés Rapid, large-scale genome as well as diagnostic DNA sequencing projects are, at present, dependent on the use of sensitive automated sequencers that rely on the detection of fluorescent signals. This emission is not an intrinsic property of the biomolecules but is a property of an optical label that must be incorporated before, during or after the sequence specific reaction. The choice of strategy, that is to be reviewed here, is a function of both the chemistry and the e (mas) nzymology of the system as well as the nature of the fractionation and the physical parameters of the detection. One may differentiate beween the labelling of the primer, incorporation of the label during elongation or base specific termination with labelled terminators. In reviewing the development of each of these strategies, the conclusion is reached that, whereas labelled primers have universal applicability, the current generation of fluorescent terminators have in, conjunction with appropriate DNA polymerases, attained a refinement that strongly favours their use. However, since they are not available for all commercial sequencing systems, the alternative procedures are not merely of historic interest but are an essential component in DNA sequencing protocols. The possibility of automated direct sequence analysis of RNA has not been ignored completely

Scientific Electronic Library Online (Spanish)

29

Stochastic resonance in the presence of spatially localized structures

Rabbiosi, Ivan; Scroggie, Andrew J.; Oppo, Gian-Luca

10 pages, 11 figures.-- PACS nrs.: 47.52.+j, 42.65.Sf, 47.20.Ky, 02.50.Ey. | Stable spatially localized structures exist in a wide variety of spatially extended nonlinear systems, including nonlinear optical devices. We study stochastic resonance (SR) in models of optical parametric oscillators in t...

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30

Stochastic resonance in the presence of spatially localized structures

Rabbiosi, Ivan; Scroggie, Andrew J.; Oppo, Gian-Luca
2003-09-08

Digital.CSIC (Spain)

31

Stochastic entrainment of optical power dropouts

Buldú, Javier M.; García-Ojalvo, Jordi; Mirasso, Claudio R.; Torrent, M. C.

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32

Stochastic entrainment of optical power dropouts

Buldú, Javier M.; García-Ojalvo, Jordi; Mirasso, Claudio R.; Torrent, M. C.
2002-08-16

Digital.CSIC (Spain)

33

Stable droplets and nucleation in asymmetric bistable nonlinear optical systems

Gomila, Damià; Colet, Pere; Oppo, Gian-Luca; San Miguel, Maxi
2004-05-04

Digital.CSIC (Spain)

34

Spontaneous and induced motion of optical patterns

Scroggie, Andrew J.; Gomila, Damià; Firth, William J.; Oppo, Gian-Luca

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35

Spontaneous and induced motion of optical patterns

Scroggie, Andrew J.; Gomila, Damià; Firth, William J.; Oppo, Gian-Luca
2005-11-04

Digital.CSIC (Spain)

37

Signal integrity studies at optical multiplexer board for TileCal system

Torres, J.; Abdallah, J.; Castillo, M.ª Victoria; Cuenca Almenar, Cristóbal; Ferrer, Antonio; Fullana, Esteban

6 pages.-- ISI Article Identifier: 000253651800006 | The Optical Multiplexer Board is a card included in the TileCal Data Acquisition System; it is designed to receive two optical fibers with same data from front-end boards and decided which has correct data. Inside this card we have different trans...

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38

Signal integrity studies at optical multiplexer board for TileCal system

Torres, J.; Abdallah, J.; Castillo, M.ª Victoria; Cuenca Almenar, Cristóbal; Ferrer, Antonio; Fullana, Esteban; González, V.; Higón, Emilio; Poveda, Joaquín; Ruiz Martínez, Arantxa; Salvachúa, Belén; Sanchís, E.; Solans, Carlos; Valero, José Alberto; Valls, Juan Antonio
2007-07-10

Digital.CSIC (Spain)

39

Restablecimiento estético y funcional de la guía anterior utilizando la técnica de estratificación con resina compuesta

Pontons Melo, Juan Carlos; Fernandes da Cunha, Leonardo; Yoshio Furuse, Adilson; Lia Mondelli, Rafael Francisco; Mondelli, José
2009-06-01

Resumen en español En Odontología, un problema observado constantemente en pacientes adultos en este inicio de siglo es sin duda, el desgaste dental patológico. Este tipo de desgaste ocurre cuando existe pérdida acentuada de la estructura dentaria, lo que generalmente ocasiona el compromiso estético de los dientes antero superiores. En consecuencia, la sociedad se está concientizando sobre la importancia de la salud y de la estética, de esta manera, la demanda por tratamientos estéti (mas) cos rehabilitadores en casos de desgaste dental patológico ha aumentado. La rehabilitación estética puede ser realizada tanto por medio de tratamientos directos como indirectos. Debido a las ventajas de las resinas compuestas, el presente trabajo tiene por finalidad describir la técnica operatoria para el restablecimiento de la guía anterior con resina compuesta, mediante la técnica de estratificación, que permite simular las características ópticas de la estructura dental. Así, con la evolución de los sistemas adhesivos, asociado a las mejoras en las propiedades químicas, mecánicas y estéticas de las resinas compuestas, tratamientos restauradores extensos, como la reconstrucción directa de las guías anteriores en los casos de desgaste dental patológico, se tornan viables. Resumen en inglés In Dentistry, a common problem observed in this beginning of century is the pathologic tooth wear. This type of wear occurs when there is accentuated loss of tooth structure, which frequently results in aesthetic compromise of the anterior maxillary teeth. As a result of the society’s awareness of the importance of health and aesthetics, the request for reparative aesthetic treatments in cases of pathologic tooth wear has increased. This aesthetic rehabilitation may be a (mas) chieved either through indirect or direct treatments. Due to the advantages of the resin composites, the aim of the present paper is to show specifically the direct approach throughout the use of a layering technique to simulate the optical characteristics of the tooth structure. Hence with the evolution of the adhesive systems associated with improving in the chemical-mechanical-aesthetical charecterics of the resin composites, extensive restorative treatments as the direct reconstruction of the anterior guidance in cases of pathologic tooth wear are now feasible.

Scientific Electronic Library Online (Spanish)

41

Realización de un Tomógrafo Óptico Coherente

Corredera Guillén, Pedro; López Quiroga, David
2007-05-04

Digital.CSIC (Spain)

42

Quantum properties of tranverse pattern formation in second-harmonic generation

Bache, Morten; Scotto, Pierre; Zambrini, Roberta; San Miguel, Maxi; Saffman, Mark

17 pages, 17 figures.-- PACS nrs.: 42.50.Dv, 42.50.Lc, 42.65.Sf.-- ArXiv pre-print available at: http://arxiv.org/abs/quant-ph/0202167 | We investigate the spatial quantum noise properties of the one-dimensional transverse pattern formation instability in intracavity second-harmonic generation. The ...

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43

Quantum correlations close to a square pattern forming instability

Hoyuelos, Miguel; Oppo, Gian-Luca; Colet, Pere; San Miguel, Maxi

11 pages, 9 figures, 1 appendix.-- PACS nrs.: 42.50.Lc, 42.65.Sf. | We analyze the quantum fluctuations of the degenerate optical parametric oscillator close to an instability for the formation of a square pattern. While strong correlations between the fluctuations of the signal modes emitted at the...

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44

Quantum correlations close to a square pattern forming instability

Hoyuelos, Miguel; Oppo, Gian-Luca; Colet, Pere; San Miguel, Maxi
2003-03-01

Digital.CSIC (Spain)

46

Polarization quantum properties in a type-II Optical Parametric Oscillator below threshold

Zambrini, Roberta; Gatti, Alessandra; Lugiato, Luigi A.; San Miguel, Maxi

14 pages, 18 figures.-- PACS nrs.: 42.50.Lc, 42.50.Dv, 42.65.Sf, 42.50.Ct.-- ArXiv pre-print available at: http://arxiv.org/abs/quant-ph/0306134 | We study the far field spatial distribution of the quantum fluctuations in the transverse profile of the output light beam generated by a type II Optica...

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47

Polarization patterns and vectorial defects in type-II optical parametric oscillators

Santagiustina, M.; Hernández-García, Emilio; San Miguel, Maxi; Scroggie, Andrew J.; Oppo, Gian-Luca

14 pages, 15 figures, 2 appendices.-- PACS nr.: 42.65.Sf.-- ArXiv pre-print available at: http://arxiv.org/abs/physics/0111023 | Previous studies of lasers and nonlinear resonators have revealed that the polarization degree of freedom allows for the formation of polarization patterns and novel local...

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48

Polarization patterns and vectorial defects in type-II optical parametric oscillators

Santagiustina, Marco; Hernández-García, Emilio; San Miguel, Maxi; Scroggie, Andrew J.; Oppo, Gian-Luca
2003-02-13

Digital.CSIC (Spain)

49

Polarization message encoding through vectorial chaos synchronization in vertical-cavity surface-emiting lasers

Scirè, Alessandro; Mulet, Josep; Mirasso, Cladio R.; Danckaert, Jan; San Miguel, Maxi

4 pages, 6 figures.-- PACS nrs.: 42.60.Mi, 42.55.Px, 42.62.–b, 42.65.Sf. | We show that self-pulsating vertical-cavity surface-emitting lasers can exhibit vectorial chaos, i.e., chaos in both intensity and polarization. The achievable synchronization degree of two such lasers is high when using a co...

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50

Plasmonic Au/Co/Au Nanosandwiches with Enhanced Magneto-optical Activity

González Díaz, Juan Bautista; García-Martín, Antonio; García-Martín, José Miguel; Cebollada, Alfonso; Armelles Reig, Gaspar; Sepúlveda Martínez, Borja; Alaverdyan, Yury; Käll, Mikael
2008-01-14

Digital.CSIC (Spain)

51

Photonic Band-Gap Inhibition of Modulational Instabilities

Gomila, Damià; Zambrini, Roberta; Oppo, Gian-Luca

4 pages, 8 figures.-- PACS nrs.: 42.70.Qs, 05.65.+b, 42.65.Sf, 89.75.Kd.-- PMID: 15245008 [PubMed]. | Spatial structures as a result of a modulational instability are studied in a nonlinear cavity with a photonic crystal. The interaction of the modulated refractive index with the nonlinearity inhibi...

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52

Photonic Band-Gap Inhibition of Modulational Instabilities

Gomila, Damià; Zambrini, Roberta; Oppo, Gian-Luca
2004-06-24

Digital.CSIC (Spain)

53

Periodic entrainment of power dropouts in mutually coupled semiconductor lasers

Buldú, Javier M.; Vicente, Raúl; Pérez, Toni; Mirasso, Claudio R.; Torrent, M. C.; García-Ojalvo, Jordi

DRIVER (Spanish)

54

Patterns arising from the interaction between scalar and vectorial instabilities in two-photon resonant Kerr cavities

Hoyuelos, Miguel; Walgraef, Daniel; Colet, Pere; San Miguel, Maxi

9 pages, 6 figures.-- PACS nrs.: 42.65.Sf, 47.54.+r, 42.50.Hz.-- ArXiv pre-print available at: http://arxiv.org/abs/cond-mat/9901310 | We study pattern formation associated with the polarization degree of freedom of the electric field amplitude in a mean field model describing a nonlinear Kerr mediu...

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55

Passive Mode Locking of Lasers by Crossed-Polarization Gain Modulation

Javaloyes, Julien; Mulet, Josep; Balle, Salvador

4 pages.-- PACS numbers: 42.60.Fc, 42.55.Px, 42.65.Sf. | We report on a novel approach for inducing passive mode locking of lasers without using any saturable absorber but exploiting the polarization degree of freedom of light. In our scheme, passive mode locking is achieved by crossed-polarization ...

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56

Parrondo's games and the zipping algorithm

Amengual, Pau; Toral, Raúl

10 pages, 6 figures.-- Presented at Conference "Noise in Complex Systems and Stochastic Dynamics II" (Maspalomas, Gran Canaria Island, Spain, Wed 26 May 2004).-- ArXiv pre-print version: http://arxiv.org/abs/cond-mat/0402515 | We study the relation between the discrete-time version of the flashing r...

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58

Optical conductance of waveguides built into finite photonic crystals

Albadalejo, S.; Sáenz, J. J.; Lester, M.; Froufe-Pérez, L.; García-Martín, Antonio
2007-08-06

Digital.CSIC (Spain)

59

Optical biosensor microsystems based on the integration of highly sensitive Mach–Zehnder interferometer devices

Sepúlveda Martínez, Borja; Sánchez del Río, José; Moreno, M.; Blanco, Francisco; Mayora, K.; Domínguez, Carlos; Lechuga, Laura M.
2006-01-01

Digital.CSIC (Spain)

60

Optical and morphological study of disorder in opals

Palacios Lidón, E.; Juárez, B. H.; Castillo Martínez, E.; López, C.
2005-03-01

Digital.CSIC (Spain)

61

Optical aberrations of intraocular lenses measured in vivo and in vitro

Barbero, Sergio; Marcos, Susana; Jiménez-Alfaro, Ignacio

DRIVER (Spanish)

62

Optical aberrations of intraocular lenses measured in vivo and in vitro

Barbero, Sergio; Marcos, Susana; Jiménez-Alfaro, Ignacio
2003-10-01

Digital.CSIC (Spain)

63

Optical Biosensor devices as early detectors of Biological and Chemical Warfare agents

Lechuga, Laura M.; Mauriz, Elba; Sepúlveda Martínez, Borja; Sánchez del Río, José; Calle Martín, Ana; Armelles Reig, Gaspar; Domínguez, Carlos
2006-01-01

Digital.CSIC (Spain)

65

On the origin of bichromatic laser emission in Nd(3+)-doped fluoride glasses

Azkargorta, J.; Iparraguirre, I.; Balda, Rolindes; Fernández Rodríguez, Joaquín
2008-07-24

Digital.CSIC (Spain)

66

ON/OFF phase shift keying for chaos-encrypted communication using external-cavity semiconductor lasers

Heil, Tilmann; Mulet, Josep; Fischer, Ingo; Mirasso, Claudio R.; Peil, Michael; Colet, Pere; Elsässer, Wolfgang
2002-09-01

Digital.CSIC (Spain)

67

Nonlocal feedback in nonlinear systems

Zambrini, Roberta; Papoff, Francesco
2010-06-01

Digital.CSIC (Spain)

69

Nonlinear Dynamics of Semiconductor Laser Systems with Feedback: Applications to Optical Chaos Cryptography, Radar Frequency Generation, and Transverse Mode Control

Chembo Kouomou, Yanne

Tesis doctoral de la Universidad de las Islas Baleares, Facultad de Física y del Departamento de Física Interdisciplinar del Instituto Mediterráneo de Estudios Avanzados (IMEDEA-CSIC/UIB).-- Fecha de lectura: 15-12-2006. | The simple fact to introduce and account for a delay time in a dynamical syst...

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70

Non-classical behavior in multimode and disordered transverse structures in OPO

Zambrini, Roberta; Barnett, Stephen M.; Colet, Pere; San Miguel, Maxi

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71

Non-classical behavior in multimode and disordered transverse structures in OPO

Zambrini, Roberta; Barnett, Stephen M.; Colet, Pere; San Miguel, Maxi
2003-01-28

Digital.CSIC (Spain)

72

Multiplicative noise in the longitudinal mode dynamics of a bulk semiconductor laser

Pedaci, Francesco; Lepri, Stefano; Balle, Salvador; Giacomelli, Giovanni; Giudici, Massimo; Tredicce, Jorge R.

11 pages.-- PACS numbers: 05.40.-a, 42.65.Sf, 42.55.Px. | We analyze theoretically and experimentally the influence of current noise on the longitudinal mode hopping dynamics of a bulk semiconductor laser. It is shown that the mean residence times on each mode have different sensitivity to external ...

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73

Multiplexing and transmission of RF signals using an optical fiber

Curpián Alonso, José; Montero de Espinosa Freijo, Francisco; López-Amo, Manuel

4 pages.-- Final full-text version of the paper is available at: http://dx.doi.org/10.1016/S0041-624X(99)00058-X. | Ultrasonic non-destructive testing systems designed to control huge structures normally use several transducers in the reception stage. To avoid increasing the cost of electronics, a m...

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74

Multiplexing and transmission of RF signals using an optical fiber

Curpián Alonso, José; Montero de Espinosa Freijo, Francisco; López-Amo, Manuel
2000-03-01

Digital.CSIC (Spain)

75

Morphology and capping effects in the magnetic and magneto-optical properties of nanoparticulate Co films

Clavero, C.; Martínez Rodríguez, Luis Javier; García-Martín, Antonio; García-Martín, José Miguel; Huttel, Y.; Telling, N. D.; Laan, G. van der; Cebollada, Alfonso; Armelles Reig, Gaspar
2008-03-17

Digital.CSIC (Spain)

76

Modulation transfer of the human eye as a function of retinal eccentricity

Navarro, Rafael; Artal, Pablo; Williams, David R.
1993-02-01

Digital.CSIC (Spain)

77

Modeling bidirectionally coupled single-mode semiconductor lasers

Mulet, Josep; Masoller, Cristina; Mirasso, Claudio R.

12 pages, 9 figures.-- PACS nrs.: 42.55.Px, 05.45.Xt, 42.65.Sf, 05.45.Vx. | We develop a dynamical model suitable for the description of two mutually coupled semiconductor lasers in a face-to-face configuration. Our study considers the propagation of the electric field along the compound system as w...

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78

Modeling bidirectionally coupled single-mode semiconductor lasers

Mulet, Josep; Masoller, Cristina; Mirasso, Claudio R.
2002-06-19

Digital.CSIC (Spain)

79

Model for cone directionality reflectometric measurements based on scattering

Marcos, Susana; Burns, Stephen A.; He, Ji Chang

11 pages, 12 figures.-- OCIS codes: 330.150, 330.190, 330.200, 330.4300, 330.5310, 330.5370, 110.0110, 290.0290.-- PMID: 9691485 [PubMed]. | Reflectrometric measurements provide an objective assessment of the directionality of the photoreceptors in the human retina. Measurements are obtained by imag...

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80
81

Mismatch-Induced Bit Error Rate in Optical Chaos Communications Using Semiconductor Lasers With Electrooptical Feedback

Chembo Kouomou, Yanne; Colet, Pere; Larger, Laurent; Gastaud, Nicolas

8 pages, 8 figures. | We analyze the influence of parameter mismatch between emitter and receiver systems on the bit error rate of an optical chaos communication scheme. Intensity hyperchaos is generated in the system by semiconductor lasers with electro-optical feedback. We find analytical predicti...

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83

Metal-nanoparticle plasmonics

Pelton, Matthew; Aizpurúa, Javier; Bryant, Garnett W.
2008-04-04

Digital.CSIC (Spain)

84

Message Encryption by Phase Modulation of a Chaotic Optical Carrier

Annovazzi-Lodi, Valerio; Benedetti, Mauro; Merlo, Sabina; Pérez, Toni; Colet, Pere; Mirasso, Claudio R.

We present a numerical and experimental evaluation of message encryption by phase modulation, using a chaotic optical carrier generated by a laser subject to delayed optical feedback. This method offers better security than the conventional amplitude masking, where the signal is simply added to the ...

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85

Message Encryption by Phase Modulation of a Chaotic Optical Carrier

Annovazzi-Lodi, Valerio; Benedetti, Mauro; Merlo, Sabina; Pérez, Toni; Colet, Pere; Mirasso, Claudio R.
2007-01-10

Digital.CSIC (Spain)

86

Mechanism controller system for the optical spectroscopic and infrared remote imaging system instrument on board the Rosetta space mission

Rodrigo Montero, Rafael; Castro Marín, J. M.; Brown, V. J. G.; López Jiménez, A. C.; Rodríguez Gómez, J.
2001-02-22

Digital.CSIC (Spain)

87

Measuring the complete transverse spatial mode spectrum of a wave field

Calvo, Gabriel F.; Picón, Antonio; Zambrini, Roberta
2008-04-29

Digital.CSIC (Spain)

88

Measuring the Complete Transverse Spatial Mode Spectrum of a Wave Field

Calvo, Gabriel F.; Picón, Antonio; Zambrini, Roberta
2008-04-29

Digital.CSIC (Spain)

89

Magnetoplasmonics. Magnetooptics in plasmonics systems

García Martín, Antonio; Armelles Reig, Gaspar; González Díaz, Juan Bautista
2010-01-01

Digital.CSIC (Spain)

90

Magnetoplasmonic nanostructures: systems supporting both plasmonic and magnetic properties

Armelles Reig, Gaspar; Cebollada, Alfonso; García-Martín, Antonio; García-Martín, José Miguel; González, María Ujué; González Díaz, Juan Bautista; Ferreiro Vila, E.; Torrado, J.F.
2009-09-17

Digital.CSIC (Spain)

91

Magneto-optical effects in interacting localized and propagating surface plasmon modes

Torrado, J. F.; González Díaz, Juan Bautista; González, María Ujué; García-Martín, Antonio; Armelles Reig, Gaspar
2010-07-18

Digital.CSIC (Spain)

92

Localized surface plasmon resonance effects on the magneto-optical activity of continuous Au/Co/Au trilayers

Armelles Reig, Gaspar; González Díaz, Juan Bautista; García-Martín, Antonio; García-Martín, José Miguel; Cebollada, Alfonso; González, María Ujué; Acimovic, Srdjan; Cesario, Jean; Quidant, Romain; Badenes, Gonçal
2008-09-25

Digital.CSIC (Spain)

93

Laser ray-tracing method for optical testing

Navarro, Rafael; Moreno Barriuso, Esther
1999-07-01

Digital.CSIC (Spain)

94

Large magnetorefractive effect in magnetite

SHVETS, IGOR; ARORA, SUNIL KUMAR

We carried out a magneto-optical spectroscopic study of magnetite (Fe3O4) thin films and single crystals at optical wavelengths. We observed a relevant quadratic magneto-optic contribution that can be notably larger than first-order linear magneto-optics at some range of wavelengths in the visible r...

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95

Invariant recognition of polychromatic images of Vibrio cholerae O1

Álvarez-Borrego, Josué; Mouriño-Pérez, Rosa Reyna; Cristóbal, Gabriel; Pech-Pacheco, José L.

7 pages, 5 figures.-- ©2002 Society of Photo-Optical Instrumentation Engineers. | Cholera is an acute intestinal infectious disease. It has claimed many lives throughout history, and it continues to be a global health threat. Cholera is considered one of the most important emergence diseases due its...

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96

Invariant recognition of polychromatic images of Vibrio cholerae O1

Álvarez-Borrego, Josué; Mouriño-Pérez, Rosa Reyna; Cristóbal Pérez, Gabriel; Pech-Pacheco, José L.
2002-04-03

Digital.CSIC (Spain)

97

Integrated optical transducers for (bio)chemical sensing

Domínguez, Carlos; Rodríguez, José Antonio; Lechuga, Laura M.
2003-01-01

Digital.CSIC (Spain)

98

Integrated optical silicon IC compatible nanodevices for biosensing applications

Lechuga, Laura M.; Sepúlveda Martínez, Borja; Llobera, Andreu; Calle Martín, Ana; Domínguez, Carlos
2003-07-28

Digital.CSIC (Spain)

99

Integrated optical readout for miniaturization of cantilever-based sensor

Nordström, M.; Zauner, D. A.; Calleja, Montserrat; Hübner, Jörg; Boisen, Anja
2007-09-06

Digital.CSIC (Spain)

100

Integrated optical read-out for miniaturisation of cantilever-based sensor system

Nordström, M.; Zauner, D. A.; Calleja, Montserrat; Hübner, Jörg; Boisen, Anja
2007-01-01

Digital.CSIC (Spain)

101

Instrumentación y diseño de una fuente de alto voltaje para fabricar rejillas de fibra óptica mediante la técnica de arco eléctrico

Hernández-García, J.C.; Estudillo-Ayala, J.M.; Rojas-Laguna, R.; Mata Chávez, R.I.; Martínez-Ríos, A.; Gutiérrez, J.G.; Trejo-Durán, M.; Vargas-Rodríguez, E.; Andrade-Lucio, J.A.; Alvarado-Méndez, E.
2010-06-01

Resumen en español En este trabajo se presenta la instrumentación y construcción de una fuente de alto voltaje, la cual fue controlada por el puerto de comunicación de entrada/ salida de una tarjeta de adquisición de datos, utilizando el lenguaje de programación gráfica LabView®. La fuente fue utilizada para la fabricación de rejillas de periodo largo de fibra óptica mediante la técnica de arco eléctrico punto por punto, con el diseño y construcción de la fuente se logró fabri (mas) car rejillas de periodo largo con un costo de fabricación menor del 80 % con respecto a la fabricación de rejillas de periodo largo con una empalmadora de fibra óptica. El instrumento fabricado tiene un panel de control virtual para modificar el tiempo de duración del arco, el voltaje aplicado y la corriente eléctrica aplicada a dos electrodos y de esa manera modificar la estructura de la fibra óptica. Las rejillas fueron fabricadas con fibra óptica convencional SMF-28 y las rejillas pueden ser utilizadas en láseres de fibra óptica, filtros ópticos y en la implementación de sensores ópticos. Resumen en inglés In this work we present the instrumentation and construction of a source of high voltage, the source is controlled by the communication port Input/Output of a card of acquisition of data, we used programming language LabView®, is a tool for the design of acquisition systems, instrumentation and control. The source was utilize for to fabricate long period grating of optical fibers by means of inducing an electric arc with the point by point procedure, with this source is (mas) have low cost in the fabrication, this is 80 % down of technique with others devices. The instrument has a panel of virtual control to modify the time of duration of the arch, the voltage and the electric current applied to the optic fiber by means of two electrodes. The gratings were fabricated with SMF-28. These gratings can be used with optical fiber lasers as optical filters and in the implementation of optical sensors.

Scientific Electronic Library Online (Spanish)

102

Initial stage of the active mode-locking in semiconductor heterolasers

Shcherbakov, Alexandre S.; Kosarsky, Alexey Yu; Campos Acosta, Joaquín; Moreno Zarate, Pedro; Mansurova, Svetlana
2009-01-01

Digital.CSIC (Spain)

104

Impact of nonlocal interactions in dissipative systems: Towards minimal-sized localized structures

Gelens, Lendert; Van der Sande, Guy; Tassin, Philippe; Tlidi, Mustapha; Kockaert, Pascal; Gomila, Damià

4 pages.-- PACS numbers: 42.65.Tg, 42.65.Sf, 05.65.+b. | In order to investigate the size limit of spatial localized structures in a nonlinear system, we explore the impact of linear nonlocality on their domains of existence and stability. Our system of choice is an optical microresonator containing...

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105

Impact of nonlocal interactions in dissipative systems: Towards minimal-sized localized structures

Gelens, Lendert; Van der Sande, Guy; Tassin, Philippe; Tlidi, Mustapha; Kockaert, Pascal; Gomila, Damià; Veretennicoff, Irina; Danckaert, Jan
2007-06-13

Digital.CSIC (Spain)

107

Growth mode and matrix effects on the magneto-optical activity of ultrathin films

Menéndez, José Luis; Armelles Reig, Gaspar; Cebollada, Alfonso; Quintana, C.; Ravelosona, D.; Chappert, C.; Peiró, F.; Cornet, A.
2002-08-26

Digital.CSIC (Spain)

108

Ghost resonance in a semiconductor laser with optical feedback

Buldú, Javier M.; Chialvo, Dante R.; Mirasso, Claudio R.; Torrent, M. C.; García-Ojalvo, Jordi

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109

Ghost resonance in a semiconductor laser with optical feedback

Buldú, Javier M.; Chialvo, Dante R.; Mirasso, Claudio R.; Torrent, M. C.; García-Ojalvo, Jordi
2003-02-03

Digital.CSIC (Spain)

110

Fuente supercontinua en fibra óptica (basada en bombeo continuo)

Martín López, Sonia; González Herráez, Miguel; Corredera Guillén, Pedro; Carrasco Sanz, Ana; Hernanz, María Luisa; Abrardi, Laura
2006-06-01

Digital.CSIC (Spain)

111

Fluctuations and correlations in hexagonal optical patterns

Gomila, Damià; Colet, Pere

9 pages, 13 figures.-- PACS nrs.: 05.40.-a, 47.54.+r, 42.65.Sf.-- ArXiv pre-print available at: http://arxiv.org/abs/cond-mat/0207127 | We analyze the influence of noise in transverse hexagonal patterns in nonlinear Kerr cavities. The near-field fluctuations are determined by the neutrally stable Go...

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113

Experiments on small (H2)N clusters

Montero, Salvador; Hernández Morilla, Juan; Tejeda, Guzmán; Fernández Sánchez, José María

4 pages, 4 figures, 1 table.-- PACS nrs.: 36.40.-c, 33.20.Fb, 05.30.Jp. | Contributed to: ISSPIC'14 - 14th International Symposium on Small Particles and Inorganic Cluster (Valladolid, Sep 15-19, 2008). | The nucleation process of small hydrogen clusters has been studied in detail with space, time, ...

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114

Experiments on PMMA models to predict the impact of corneal refractive surgery on corneal shape

Dorronsoro, Carlos; Cano, Daniel; Merayo-Lloves, Jesús; Marcos, Susana
2006-06-26

Digital.CSIC (Spain)

115

Experimental quantum key distribution at a wavelength of λ~850nm

Fernández Mármol, Verónica; Arroyo Guardeño, David; García Martínez, María José; Hiskett, P. A.; Collins, R. J.; Buller, Gerald S.; Orúe, Amalia B.
2008-01-01

Digital.CSIC (Spain)

116

Experimental evidence of van der Pol-Fitzhugh-Nagumo dynamics in semiconductor optical amplifiers

Barland, Stéphane; Piro, Oreste; Giudici, Massimo; Tredicce, Jorge R.; Balle, Salvador

6 pages, 9 figures.-- PACS nrs.: 05.45.-a, 42.65.Sf. | Thermo-optical pulsing in semiconductor amplifiers is experimentally shown to correspond to a very common excitable scenario (the van der Pol–Fitzhugh–Nagumo system). Self-sustained oscillations appear in the sequence predicted by this simple dy...

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117

Experimental evidence of van der Pol-Fitzhugh-Nagumo dynamics in semiconductor optical amplifiers

Barland, Stéphane; Piro, Oreste; Giudici, Massimo; Tredicce, Jorge R.; Balle, Salvador
2003-09-19

Digital.CSIC (Spain)

118

Experimental and theoretical investigations on elliptically polarized dynamical transition states in the polarization switching of vertical-cavity surface-emitting lasers

Sondermann, Markus; Ackemann, Thorsten; Balle, Salvador; Mulet, Josep; Panajotov, Krassimir

14 pages, 9 figures.-- PACS nrs.: 42.25.Ja; 42.55.-f; 42.55.Px; 42.65.Sf. | The existence region of elliptically polarized dynamical states in the polarization dynamics of vertical-cavity surface emitting lasers is investigated experimentally and theoretically. These states can occur in the vicinity...

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120
121

Excitability mediated by dissipative solitons in nonlinear optical cavities

Colet, Pere; Gomila, Damià; Jacobo, Adrián; Matías, Manuel A.
2008-09-01

Digital.CSIC (Spain)

122

Estimadores de fase óptica en sistemas modernos de comunicaciones Homodinas/ Optical Phase Estimators in Modern Homodyne Communications Systems

Arvizu-Mondragón, A.; Mendieta-Jiménez, F.J.; Sánchez-López, J. de D.
2009-09-01

Resumen en español En este trabajo reportamos la síntesis de un estimador óptimo de la fase de una portadora con modulación de fase aleatoria detectada coherentemente. Nuestra aplicación está orientada a la detección homodina con modulación binaria de la fase en sistemas modernos de comunicaciones ópticas. Mecanizamos un estimador que opera sobre un observable en banda base con ruido aditivo, usando un modelo en variables de estado para el canal de comunicaciones y técnicas de esti (mas) mación óptimas. Evaluamos con simulaciones el desempeño de la estructura general y versiones simplificadas del estimador a través del valor cuadrático medio de su error de fase. De estos resultados se obtuvieron estimadores prácticos que implementamos en circuitería analógica y usando un proce sador digital de señales. El estimador de "varianza constante" presentó el mejor desempeño experimental evaluado a través del valor cuadrático medio de su error de fase. Resumen en inglés This work consists of the synthesis of an optimal estimator for a random phase modulation onto a carrier to be received by a coherent detector. Our application is oriented to homodyne detection with PSK format, in modern optical communication systems. We mecha nize an estimator operating with a baseband observable in additive noise employing a state variable model for the communication channel and optimal estimation techniques. To as sess the performance of the general st (mas) ructure and simplified versions of the estimator we made com puter simulations and calculated the r.m.s. value of the phase error. With these results we get practical estimators that we implemented using analog electronic circuitry and a DSP. The "constant variance" estimator exhibited the minimum r.m.s. value of its phase error obtained experimentally.

Scientific Electronic Library Online (Spanish)

124

Effects of gain and bandwidth on the multimode behavior of optoelectronic microwave oscillators

Chembo Kouomou, Yanne; Larger, Laurent; Bendoula, Ryad; Colet, Pere
2008-06-04

Digital.CSIC (Spain)

125

Effects of a localized beam on the dynamics of excitable cavity solitons

Jacobo, Adrián; Gomila, Damià; Matías, Manuel A.; Colet, Pere

9 pages, 12 figures.-- PACS nrs.: 42.65.Tg, 42.65.Sf, 05.45.-a, 89.75.Fb.-- ArXiv pre-print available at: http://arxiv.org/abs/0808.2570 | We study the dynamical behavior of dissipative solitons in an optical cavity filled with a Kerr medium when a localized beam is applied on top of the homogeneous...

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126

Effects of a localized beam on the dynamics of excitable cavity solitons

Jacobo, Adrián; Gomila, Damià; Matías, Manuel A.; Colet, Pere
2008-11-19

Digital.CSIC (Spain)

127

Effect of sampling on real ocular aberration measurements

Llorente, Lourdes; Marcos, Susana; Dorronsoro, Carlos; Burns, Stephen A.
2007-09-01

Digital.CSIC (Spain)

128

Effect of parameter mismatch on the synchronization of chaotic semiconductor lasers with electro-optical feedback

Chembo Kouomou, Yanne; Colet, Pere; Gastaud, Nicolas; Larger, Laurent

15 pages, 11 figures.-- PACS nrs.: 05.45.Vx, 05.45.Xt, 05.45.Jn, 42.65.Sf.-- PMID: 15244923 [PubMed]. | We investigate the detrimental effect of parameter mismatch on the synchronization of lasers with electro-optical feedback, whose intensity dynamics can display hyperchaotic behavior. Analytical t...

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130

Effect of external noise correlation in optical coherence resonance

Buldú, Javier M.; García-Ojalvo, Jordi; Mirasso, Claudio R.; Torrent, M. C.; Sancho, J. M.
2001-10-19

Digital.CSIC (Spain)

131

Effect of defocus on on-axis wave aberration of a centered optical system

Smith, George; Atchison, David A.; Barbero, Sergio
2006-06-14

Digital.CSIC (Spain)

132

Efecto de cinco sistemas de pulido de resinas compuestas sobre superficie coronaria y radicular: Observación por medio de MEB y microscopía óptica/ Effects of Five Composite Polishing Systems over Crown and Root Surface: SEM and Optical observations

Martín, Javier; Moncada, Gustavo; Serey, Francisco; Oyarzún, Alejandro; Angel, Pablo; Oyarzo, Juan; Fernández, Eduardo
2009-03-01

Resumen en español El objetivo de este estudio in vitro fue describir la superficie coronaria y radicular alrededor de restauraciones de resina compuesta posterior a su pulido. Materiales y método: se realizaron 50 restauraciones estandarizadas sobre la superficie coronaria y 50 sobre la superficie radicular de dientes extraídos por indicación ortodóncica. Las cavidades se prepararon utilizando fresas cilíndricas de carbide (Meissinger®) con alta velocidad (Champion Dental Products In (mas) c) bajo irrigación y fueron restauradas con resina compuesta híbrida (Filtek® Z 250, 3M®). Fueron separadas aleatoriamente en 5 grupos de 10 restauraciones coronarias y 10 radiculares. Cada grupo fue pulido utilizando un sistema diferente, siguiendo las indicaciones del fabricante. Grupo 1 (PB): Piedras de Arkansas (Dedeco). Grupo 2 (PD): piedras de diamante finas, extrafinas y ultrafinas (Diatech®). Grupo 3 (DOA): discos de óxido de aluminio (Sof lex®, 3M®). Grupo 4 (PG): puntas Enhance® (Dentsply®). Grupo 5 (FCT): fresas de carburo tungsteno de 16 y 30 cuchillo (Komet®). 10 dientes sin tratamiento se dejaron como grupo control (Grupo 6). Todas las muestras fueron observadas y fotografiadas mediante microscopía electrónica de barrido (TEAC Siemens®) y microscopía óptica (Carl Zeiss®). Las imágenes se compararon con las del grupo control. Resultados: la comparación de las microfotografías de los grupos tratados con las del grupo control mostró cambios en la corona y en la raíz en los grupos 1, 2, 3 y 4. En la corona se observó una pérdida de las características superficiales del esmalte y en la raíz una pérdida del cemento y exposición de dentina. En el grupo 5 algunas muestras presentaron modificación de la estructura superficial normal y otras no. Conclusión: los 5 sistemas de pulido de resinas compuestas analizados en este estudio modificaron la superficie del esmalte y el cemento. Resumen en inglés The aim of this IN VITRO study was to describe the crown and root surface surrounding composite restorations, after polishing procedures. Materials and Methods: 50 standardized restorations were made over the crown surface and 50 over the root surface of teeth extracted by orthodontics indications. The cavities were prepared using cylindrical carbide burs (Meissinger) under water irrigation with a high speed hand piece (Champion Dental Products Inc) and restored with hybr (mas) id composite (Filtek Z250®, 3M®). They were randomized and separated into five groups of 10 restorations either in crown and root. Each group was polished using different systems, according to manufacturer’s instructions. Group 1(PB): Arkansas Stone (Dedeco). Group 2 (PD): Fine, extrafine and ultrafine Diamond Burs (Diatech®). Group 3 (DOA): Aluminum Oxide Discs (Sof lex® 3M®). Group 4 (PG): Enhance® Points (Dentsply®). Group 5 (FCT): 16 and 30 blades Tungsten Carbide Burs (Komet®). 10 teeth without treatment were used as control group (Group 6). All samples were analyzed and photographed by SEM (TEAC Siemens®), and Optical microscope (Carl Zeiss®). The images were compared with control group. Results: The comparison of the microphotography with control group showed changes in both crown and root surfaces in groups 1, 2, 3 and 4. It was seen a loss of the enamel superficial characteristics, in crown surfaces and a loss of the cementum and exposure of dentin in root. In group 5 some specimens resulted in a modification of normal tooth surface characteristics and in others there were no changes. Conclusions: The five composites polishing systems analyzed in this study resulted in enamel and cementum modification.

Scientific Electronic Library Online (Spanish)

133

ESTUDIO COMPARATIVO DEL SISTEMA REPRODUCTOR FEMENINO DE TRES ESPECIES DE NYMPHALIDAE (LEPIDOPTERA: PAPILIONOIDEA) DE COLOMBIA/ COMPARATIVE STUDY OF THE FEMALE REPRODUCTIVE SYSTEM IN THREE NYMPHALIDAE SPECIES (LEPIDOPTERA: PAPILIONOIDEA) IN COLOMBIA

Rubio-G, José David; Valencia-M, Camilo A
2009-12-01

Resumen en español Este trabajo describe y compara el sistema reproductor femenino de Ithomia alienassa (Ithomiinae), Heliconius charithonia (Heliconiinae) y Actinote equatoria (Acraeiinae). Se recolectaron 10 hembras por especie y se anatomizó la región abdominal para la extracción del sistema reproductor. Se hizo un análisis de los sistemas reproductores a través de microscopía óptica donde se evidenció que la forma y tamaño de las ovariolas varía en cada especie, así como las (mas) demás partes constitutivas del sistema reproductor, determinando la estrategia reproductiva que cada especie desarrolla. Resumen en inglés This work describes and compares the female reproductive system of Ithomia alienassa (Ithomiinae), Heliconius charithonia (Heliconiinae), and Actinote equatoria craeinae). Ten females per species were collected; their abdominal region was anatomized for the extraction of their reproductive system. Through optical microscopy, the analysis of the reproductive systems evidenced that both the form and size of the ovarioles vary in each species, as well as the other constitutive parts of their reproductive system, determining the reproductive strategy developed by each species.

Scientific Electronic Library Online (Spanish)

134

Dynamics, correlation and synchronization behavior in rings of delay-coupled oscillators

Van der Sande, Guy; Soriano, Miguel C.; Fischer, Ingo; Mirasso, Claudio R.

4 pages, 4 figures.-- PACS nrs.: 05.45.Xt; 02.30.Ks; 05.45.Jn; 42.65.Sf.-- Rapid communication. | We study the dynamics of unidirectionally delay-coupled nonlinear oscillators. Cascading them within a ring of fixed total propagation delay, we demonstrate simple scaling behavior of correlation proper...

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135

Dynamics of Semiconductor Lasers with Bidirectional Optoelectronic Coupling: Stability, Route to Chaos and Entrainment

Vicente, Raúl; Tang, Shuo; Mulet, Josep; Mirasso, Claudio R.; Liu, Jia-Ming

11 pages.-- PACS nrs.: 05.45.Xt, 42.55.Px, 42.65.Sf, 05.45.Vx. | The dynamical behavior of two mutually coupled semiconductor lasers is studied. An optoelectronic coupling including a time delay in the propagation of the signals between the two lasers is considered. Starting from the appropriate rat...

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136

Dynamical instabilities of dissipative solitons in nonlinear optical cavities with nonlocal materials

Gelens, Lendert; Gomila, Damià; Van der Sande, Guy; Danckaert, Jan; Colet, Pere; Matías, Manuel A.

7 pages, 9 figures.-- PACS nrs.: 42.65.Sf; 05.45.-a; 42.65.Tg.-- ArXiv pre-print available at: http://arxiv.org/abs/0810.2808 | In this work we characterize the dynamical instabilities of localized structures exhibited by a recently introduced [Gelens et al., Phys. Rev. A 75, 063812 (2007)] generali...

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137

Dynamical instabilities of dissipative solitons in nonlinear optical cavities with nonlocal materials

Gelens, Lendert; Gomila, Damià; Van der Sande, Guy; Danckaert, Jan; Colet, Pere; Matías, Manuel A.
2008-03-21

Digital.CSIC (Spain)

138

Dynamical entrainment of unidirectionally coupled single mode diode lasers

Pérez, Toni; Vicente, Raúl; Mirasso, Claudio R.; Colet, Pere
2002-01-16

Digital.CSIC (Spain)

141

Determinación de la tensión superficial para el sistema alcano/aire y alcohol/aire mediante la técnica de la gota colgante: correlación para alcanos y alcoholes/ Determination of surface tension for alkane/air and alcohol/air systems by pendant drop technique: correlation for alkane and alcohol

Zeppieri, Suzana; López de Ramos, Aura
2009-06-01

Resumen en español Se midió la tensión superficial para diferentes alcanos líquidos y alcoholes (desde n-hexano hasta n-dodecano y desde metanol hasta el decanol), empleando la técnica experimental de la gota colgante con un método numérico desarrollado por López de Ramos et al. (1993). El equipo experimental usado para generar las gotas, consistió en una celda de cuerpo metálico (con dos visores de vidrio de calidad óptica). La fase líquida se introdujo por el tope de la celda e (mas) mpleando un capilar para formar la gota colgante. La temperatura fue variada entre 10 y 70 ºC, empleando un baño termostático. Para obtener las imágenes de la gota colgante se dispuso de una cámara de video, lentes micro de 60 mm, grabador y de una computadora. Se obtuvo una nueva correlación para predecir la tensión superficial como una función de la temperatura y el número de átomos de carbono. Esta correlación permite calcular la tensión superficial con una desviación menor al 10 % Resumen en inglés Surface tension was measured for different liquid alkanes and alcohols (from n-hexane to n-dodecane and from methanol to decanol), using the pendant drop experimental technique with a numerical method developed by López de Ramos et al. (1993). The experimental equipment used to generate the drops consisted of a cell of a metallic body (with two glass windows of optical quality). The liquid phase was introduced from the top of the cell employing a capillary tube to form t (mas) he pendant drop. Temperature was changed between 10 and 70 °C, employing a thermostatic bath. To obtain the images of the pendant drops it was used a video camera, a micro lens (60 mm), a video recording system and a computer. A new correlation was obtained to predict surface tension as a function of temperature and the number of atoms of carbon. This correlation allows computing surface tension with deviations no greater than 10% for the case of the hydrocarbons and no greater than 5% for the alcohol/air system

Scientific Electronic Library Online (Spanish)

142

Detection of local defects in textile webs using Gabor filters

Escofet Soteras, Jaume; Navarro, Rafael; Millán García-Varela, María Sagrario; Pladellorens, Josep
1998-08-01

Digital.CSIC (Spain)

143

DETERMINING THE PARAMETERS OF PICOSECOND OPTICAL PULSES GENERATED BY THE ACTIVELY MODE‐LOCKED SEMICONDUCTOR HETEROLASERS

Shcherbakov, Alexandre S.; Kosarsky, Alexey Yu.; Campos Acosta, Joaquín; Moreno Zarate, Pedro
2009-01-01

Digital.CSIC (Spain)

144
146

Coupled optical excitable cells

Yacomotti, Alejandro M.; Mindlin, Gabriel B.; Giudici, Massimo; Balle, Salvador; Barland, Stéphane; Tredicce, Jorge R.

11 pages, 11 figures.-- PACS nrs.: 05.45.-a, 42.65.Sf. | In this work we investigate experimentally the dynamics of two coupled optical excitable cells, namely, two semiconductor lasers with optical feedback. We analyze the dynamics observed in terms of the statistical properties of the time series ...

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147

Coupled optical excitable cells

Yacomotti, Alejandro M.; Mindlin, Gabriel B.; Giudici, Massimo; Balle, Salvador; Barland, Stéphane; Tredicce, Jorge R.
2002-09-27

Digital.CSIC (Spain)

148

Coupled Brownian Motors: anomalous-to-normal hysteresis transition and noise-induced limit cycle

Wio, Horacio S.; Mangioni, Sergio

8 pages, 4 figures.-- Published in: Proc. SPIE's First International Symposium on Fluctuations and Noise, Conference: "Noise in Complex Systems and Stochastic Dynamics" (Santa Fe, NM, USA, Jun 2, 2003). | We study a model consisting of N nonlinear oscillators with "global periodic" coupling and "loc...

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149

Correlation between optical, chemical and micro-structural parameters of high-rank coals and graphite

Marques, M.; Suárez Ruiz, Isabel; Flores, D.; Guedes, A.; Rodrigues, S.

6 pages, 6 figures, 4 tables. -- Available online 4 July 2008. -- Issue title: CSCOP-TSOP-ICCP 2007: Selected papers from the 2007 joint meeting of CSCOP-TSOP-ICCP: Unconventional petroleum systems & advances in organic petrology and geochemistry (Victoria BC, Sunday, August 19th to Saturday August ...

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150

Convective instability induced by two-points nonlocality

Zambrini, Roberta; Papoff, Francesco

11 pages.-- PACS numbers: 42.65.Sf, 05.40.Ca, 89.75.Kd.-- Final full-text version of the paper available at: http://dx.doi.org/10.1103/PhysRevE.73.016611. | We consider diffusive nonlinear systems with nonlocal two-points coupling, generally induced by misalignment in optical feedback. We expand the...

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151

Convective instability induced by nonlocality in nonlinear diffusive systems

Papoff, Francesco; Zambrini, Roberta

4 pages, 5 figures.-- PACS nrs.: 42.65.Sf, 05.40.Ca, 05.45.-a, 89.75.Kd.-- ArXiv pre-print available: http://cn.arxiv.org/abs/nlin.PS/0503064 | We consider a large class of nonlinear diffusive systems with nonlocal coupling. By using a nonperturbative analytical approach we are able to determine the...

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153

Convection induced nonlinear-symmetry-breaking in wave mixing

Zambrini, Roberta; San Miguel, Maxi; Durniak, Céline; Taki, Majid

4 pages.-- PACS nrs.: 42.65.Tg, 89.75.Kd, 42.65.Sf, 47.54.+r.-- ArXiv pre-print available at: http://arxiv.org/abs/nlin/0503063v1.-- ©2005 The American Physical Society. | We show that the combined action of diffraction and convection (walk-off) in wave mixing processes leads to a nonlinear-symmetry...

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154

Convection induced nonlinear-symmetry-breaking in wave mixing

Zambrini, Roberta; San Miguel, Maxi; Durniak, Céline; Taki, Majid
2005-06-28

Digital.CSIC (Spain)

155

Contrast improvement of confocal retinal imaging by use of phase-correcting plates

Burns, Stephen A.; Marcos, Susana; Elsner, Ann E.; Bará, Salvador
2002-03-15

Digital.CSIC (Spain)

159

Comparación de tres instrumentos de tomografía de coherencia óptica, un time-domain y dos Fourier-domain, en la estimación del grosor de la capa de fibras nerviosas de la retina/ Comparison of three optical coherence tomography devices, one time-domain and two fourier-domain, for the estimation of the retinal nerve fibre layer thickness

Sánchez-Dalmau, B.; Llorenç, V.; Ortiz, S.; Martínez, L.
2010-05-01

Resumen en español Objetivo: Determinar la concordancia entre un sistema de tomografía de coherencia óptica (TCO) time-domain (Stratus) y dos sistemas de TCO Fourier-domain (Cirrus y 3D TCO-1000) en la determinación del grosor de la capa de fibras nerviosas de la retina (CFNR). Métodos: Se incluyeron 50 ojos de 25 pacientes con patología neurooftalmológica de la vía visual aferente. A todos los pacientes se les realizó en ambos ojos, el mismo día y por el mismo operario, un triple (mas) examen de TCO de la CFNR con Stratus, Cirrus y 3D TCO-1000. El grosor medio de la CFNR global, por cuadrantes y por sectores horarios fueron comparados mediante el coeficiente de concordancia de Lin (CCC) y figuras de Bland-Altman. Resultados: El grosor de la CFNR global, de los cuadrantes temporal y nasal y de los sectores horarios correspondientes estimado mediante 3D TCO-1000 fue el más alto (global, 90,02 µm), en cambio, el grosor de la CFNR en los cuadrantes superior e inferior y en los sectores horarios correspondientes fue mayor con Stratus. El CCC entre Stratus y Cirrus fue alto (0,820), en cambio, la concordancia entre Stratus y 3D TCO-1000 fue moderada globalmente (0,573) y entre Cirrus y 3D TCO-1000 resultó moderada de forma global (0,564), pero muy baja en los cuadrantes nasal y temporal (0,362 y 0,347 respectivamente). Conclusiones: Los espesores medios de la CFNR obtenidos mediante los TCO Stratus, Cirrus y 3D TCO-1000 no son equivalentes. Aunque la concordancia entre Stratus y Cirrus es alta, entre 3D TCO-1000 y Stratus o Cirrus es muy baja. Resumen en inglés Purpose: To assess agreement between one system of time-domain optical coherence tomography (OCT) (Stratus) and two systems of fourier-domain OCT (Cirrus and 3D OCT-1000) for the measurement of the retinal nerve fibre layer thickness (RNFL). Methods: Fifty eyes from 25 patients with neuro-ophthalmological disorders of the afferent visual pathway were included. A triple RNFL thickness OCT examination with Stratus, Cirrus and 3D OCT-1000 was performed on both eyes of every (mas) patient, on the same day and by the same technician. The average RNFL thickness by quadrants and clock sectors were compared with the Lin´s concordance correlation coefficient (CCC) and Bland-Altman plots. Results: The average RNFL thickness, the temporal and nasal quadrants and corresponding clock sectors, was higher by 3D OCT-1000 (mean 90.02 microns), nevertheless, RNFL thickness of the superior and inferior quadrants and corresponding clock hours was higher when measured by Stratus device. The CCC agreement between Stratus and Cirrus was high (0.820), between Stratus and 3D OCT-1000 was moderate (mean 0.573) and between Cirrus and 3D OCT-1000 was moderate with a mean of 0.564 but too low in the nasal and temporal quadrants (0.362 and 0.347 respectively). Conclusions: The RNFL thickness measurements by Stratus, Cirrus and 3D OCT-1000 OCT are not equivalent. Although the agreement between Stratus and Cirrus was high, it was too low between 3D OCT-1000 and Stratus or Cirrus.

Scientific Electronic Library Online (Spanish)

160

Class A lasers with injected signal: bifurcation set and Lyapunov-potential function

Mayol, Catalina; Toral, Raúl; Mirasso, Claudio R.; Natiello, Mario A.

12 pages, 10 figures, 1 table.-- PACS nrs.: 42.65.Sf, 42.55.Ah, 42.60.Mi. | We describe the bifurcation set for a class-A laser with an external injected signal in terms of the amplitude and the frequency of the applied field. We explain the dynamical behavior of this kind of lasers in terms of a Ly...

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161

Chaotic breathers in delayed electro-optical systems

Chembo Kouomou, Yanne; Colet, Pere; Larger, Laurent; Gastaud, Nicolas

4 pages, 6 figures.-- PACS nrs.: 42.65.Sf, 05.45.Jn.-- PMID: 16384058 [PubMed]. | We show that in integro-differential delayed dynamical systems, a hybrid state of simultaneous fastscale chaos and slow-scale periodicity can emerge subsequently to a sequence of Hopf bifurcations. The resulting time t...

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162

Chaotic breathers in delayed electro-optical systems

Chembo Kouomou, Yanne; Colet, Pere; Larger, Laurent; Gastaud, Nicolas
2005-11-09

Digital.CSIC (Spain)

163

Características generales y propiedades de las cerámicas sin metal/ General features and properties of metal-free ceramics restorations

Álvarez-Fernández, Mª. Ángeles; Peña-López, José Miguel; González-González, Ignacio Ramón; Olay-García, Mª. Sonsoles
2003-10-01

Resumen en español Introducción y objetivos: los actuales sistemas restauradores cerámicos sin base metálica son una realidad creciente debido a las inmejorables propiedades ópticas y estéticas que presentan gracias a su comportamiento con la luz, la capacidad para mimetizar con los dientes naturales, etc. A pesar de las ventajas indiscutibles que poseen todavía presentan algunos problemas de tipo mecánico y funcional (como la fragilidad, la fractura, la abrasión de los antagonistas (mas) , etc.) que limitan actualmente su uso generalizado como materiales restauradores. Tanto los nuevos materiales cerámicos, como los innovadores métodos de procesamiento asistidos por ordenador auguran un futuro próximo donde el uso de porcelanas libres de metal sea masivo en el quehacer diario de la profesión odontoestomatológica. Nuestro objetivo a la hora de abordar este tema es revisar los conceptos actuales sobre las porcelanas sin metal. Material y metodología: se realiza en base a una revisión bibliográfica del tema propuesto y que se estructurará en los siguientes apartados: evolución histórica, definición del material y sinonimia, propiedades deseables o exigibles a los materiales restauradores cerámicos, ventajas e inconvenientes de ellos derivados, clasificación de las porcelanas dentales, composición de las porcelanas dentales y algunas propiedades. Resultados y discusión: en base a los datos encontrados en la bibliografía consultada. Resumen en inglés Introduction and goals: Modern restorative metal-free ceramic systems are increasingly used because of their excellent optical and aesthetic properties, due to their light transmission, their ability to mimic natural teeth, etc. Despite their advantages, some mechanical problems persist related to ceramics (such as weakness, fracture incidence, wear of opposing enamel, …), thereby limiting their generalized use as restorative materials. Both the new ceramic materials and (mas) the CAD-CAM systems favour a massive use of all-ceramic systems in dentistry in a near future. The goal of the present article is to review the state of the art of metal-free ceramic systems. Material and methodology: Our study is carried out based on a review of the literature, structured as follows: historical evolution, definition and desirable properties of ceramic restorative materials, derived advantages and disadvantages, classification of dental ceramics, composition and properties of dental ceramics. Results and discussions: Based on the reviewed literature

Scientific Electronic Library Online (Spanish)

164

Caracterización de un sistema acuoso de recubrimiento de película para tabletas

Díaz Polanco, Iverlis; Gárciga Hernández, María Rosa; Pérez Crespo, Ana Ibis; Roberto Cordovés, Yamilka
2002-12-01

Resumen en español Se desarrolló la caracterización de suspensiones de recubrimiento de núcleos placebos en sistemas acuosos que tenían como base polycoat 2 blanco, las que fueron coloreadas con 3 colorantes Lake diferentes. Se evaluó la densidad de estas suspensiones con diferentes porcentajes de sólidos dispersos (10-20 %), y se observó un aumento de estas con el incremento de sólidos dispersos. Se realizó el recubrimiento de núcleos placebos de diferentes tamaños de troquel y (mas) a las tabletas recubiertas se les efectuó un estudio de estabilidad del color a la luz, mediante la evaluación de su densidad óptica, estableciéndose el orden amarillo > azul > rojo. Se llevó a cabo un estudio de ganancia de humedad de las tabletas recubiertas a diferentes humedades relativas en hidrostatos estabilizados, y se confirmó la eficacia del sistema de recubrimiento para la protección de las tabletas en condiciones normales de humedad relativa. Los parámetros físico-químicos evaluados en núcleos placebos y tabletas recubiertas cumplen con los límites establecidos y se discuten algunos de ellos. Resumen en inglés The characterization of suspensions for coating placebo nuclei was developed in aqueous systems with white polycoat 2 as a base. The suspensions were colored with 3 different Lake coloring matters. The density of these suspensions was evaluated with diverse percentages of disperse solids (10-20 %). An increase of them was observed with the increment of disperse solids. The coating of placebo nuclei of different die sizes was carried out and the coated tablets were submitt (mas) ed to a study on the stability of color to light by evaluating their optical density. The following order was established: yellow > blue > red. A study on the humidity gain of the coated tablets was conducted at various relative humidities in stabilized hydrostats and the efficiency of the coating system for protecting tablets under normal conditions of relative humidity was confirmed. The physical and chemical parameters evaluated in placebo nuclei and coated tablets fulfilled the established limits and some of them were discussed.

Scientific Electronic Library Online (Spanish)

165

Bistability and all-optical switching in semiconductor ring lasers

Pérez, Toni; Scirè, Alessandro; Van der Sande, Guy; Colet, Pere; Mirasso, Claudio R.
2007-10-03

Digital.CSIC (Spain)

166

Application of the S-CIELAB color model to processed and calibrated images with a colorimetric dithering method

Chorro Calderón, Elísabet; Perales Romero, Esther; Fez Saiz, Dolores de; Luque Cobija, María José; Martínez Verdú, Francisco Miguel

This work uses the S-CIELAB color model to compare images that have been calibrated and processed using a colorimetric dithering method which simulates increments in viewing distance. Firstly, we obtain XYZ calibrated images by applying the appropriate color transformations to the original images. T...

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167

Aplicación de la tecnología láser en las lesiones de genitales/ Application of laser technology to genital lesions

Díez Recio, Esther; Cuevas Santos, Jesús; Boixeda de Miquel, Pablo; Fonseca Capdevila, Eduardo; Eusebio Murillo, Esther de
2008-11-01

Resumen en español El empleo del láser en urología ha presentado un avance significativo y en la actualidad es empleado en una gran variedad de patologías. El desarrollo de los diferentes tipos de láser, el empleo de diferentes tipos de longitudes de onda, los sistemas de fibra óptica, la precisión y la reducción del coste han hecho mejorar la tecnología del láser, y extender y potenciar sus indicaciones. Los diversos tipos de láser de los que disponemos en la actualidad, suponen (mas) una excelente alternativa terapéutica en el tratamiento de diversas patologías benignas, pre-malignas y malignas localizadas en los genitales, con excelentes resultados estéticos y funcionales, y con una reducida morbilidad. El objetivo de esta trabajo es proporcionar las indicaciones clínicas más importantes y aplicaciones con el láser más novedosas en las lesiones genitales. Resumen en inglés The use of laser applications in urology has undergone significant advances and is now used in a wide variety of procedures. Improvements in types of lasers, the wavelength of energy used, optical fiber delivery systems, precision of laser applications and cost reduction have served to further improve laser technology and extend the potential applications. The different types of lasers available at the present time appear to be an alternative treatment modality with excel (mas) lent cosmetic and functional results and low morbidity in the treatment of benign, pre-malignant and malignant lesions in the genital area. The objective of this article is to provide an update on the most important clinical and experimental advancements therapeutic applications of lasers in genital lesions.

Scientific Electronic Library Online (Spanish)

168

Anticipating the response of excitable systems driven by random forcing,

Ciszak, Marzena; Calvo, Óscar; Masoller, Cristina; Mirasso, Claudio R.; Toral, Raúl

4 pages, 5 figures.-- PACS nrs.: 05.40.Ca, 42.65.Pc, 42.65.Sf.-- ArXiv pre-print available at: http://arxiv.org/abs/cond-mat/0203583 | We study the regime of anticipated synchronization in unidirectionally coupled model neurons subject to a common external aperiodic forcing that makes their behavior...

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169

Anticipating the response of excitable systems driven by random forcing,

Ciszak, Marzena; Calvo, Óscar; Masoller, Cristina; Mirasso, Claudio R.; Toral, Raúl
2003-05-22

Digital.CSIC (Spain)

170

Anticipated synchronization in neuronal system subject to noise

Toral, Raúl; Mirasso, Claudio R.; Masoller, Cristina; Ciszak, Marzena; Calvo, Óscar

8 pages, 4 figures.-- Presented at Conference: "Noise in Complex Systems and Stochastic Dynamics" (Santa Fe, NM, USA, Jun 2, 2003).-- SPIE Vol title: "Noise in Systems with Delay". | We report the observation of synchrony in two unidirectionally coupled (master-slave) model neurons (implemented by e...

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174

Aberrometry: the past, present and future of optometry

Thibos, Larry N.; Applegate, Raymond A.; Marcos, Susana
2003-01-01

Digital.CSIC (Spain)

175

A quantum key distribution system operating at gigahertz clock rates

Gordon, Karen J.; Fernández Mármol, Verónica; Buller, Gerald S.; Townsend, Paul D.; Cova, Segio D.; Tisa, Simone
2004-01-01

Digital.CSIC (Spain)

177

A Fokker-Planck description for Parrondo's games

Toral, Raúl; Amengual, Pau; Mangioni, Sergio

9 pages, 4 figures.-- Presented at Conference "Noise in Complex Systems and Stochastic Dynamics" (Santa Fe, NM, USA, Jun 2, 2003). | ArXiv pre-print available at: http://arxiv.org/abs/cond-mat/0304684 | We discuss in detail two recently proposed relations between the Parrondo's games and the Fokker-...

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178

1,3-Transposition of primary allylic alcohols: Synthesis of optically active secondary and tertiary allylic alcohols

Dorta, Rosa L.; Rodríguez Morales, María S.; Salazar, José A.; Suárez, Ernesto
1997-06-30

Digital.CSIC (Spain)

179

Sistemas de análisis digital de imágenes en el glaucoma/ Systems of imaging digital systems in case of glaucoma

Fernández Argones, Liamet; Piloto Díaz, Ibrain; Coba Peña, María Josefa; Pérez Tamayo, Bertila; Domínguez Randulfe, Marerneda; Trujillo Fonseca, Katia
2009-09-01

Resumen en español A la luz del desarrollo tecnológico actual incorporado a la Oftalmología, no se concibe el seguimiento riguroso del Glaucoma sin el uso de los sistemas de análisis digital de imágenes de la papila y de la capa de fibras neurorretinianas. Se realiza una revisión bibliográfica sobre los aportes de la Polarimetría Láser de Barrido (GDx VCC, Carl Zeiss Meditec, Dublin, CA), la Tomografia Confocal Láser (Heidelberg Retina Tomograph HRT, Heidelberg Engineering Inc.) y (mas) la Tomografía de Coherencia Óptica (Stratus OCT, Carl Zeiss Meditec, Alemania) en el diagnóstico y seguimiento del Glaucoma. Se considera que las mensuraciones objetivas brindadas deben ser incorporadas de forma eficiente e intuitiva para sacarles el máximo de provecho en beneficio de los pacientes. Resumen en inglés Now a day we can´t consider the strict follow up in Glaucoma without the use of the digital analysis of image system of the optic nerve head and the retinal nerve fiber layer. This is a review about some contributions of Scanning Laser Polarimetry (GDx VCC, Carl Zeiss Meditec, Dublin, CA), Confocal Scanning Laser (Heidelberg Retina Tomograph HRT, Heidelberg Engineering Inc.) and Optical Coherence Tomography (Stratus OCT, Carl Zeiss Meditec, Alemania) in the diagnosis and (mas) follow up of Glaucoma. It´s considered that objective measurement giving by them must be incorporate in the rigorous analysis of each glaucomatous patient.

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