Sample records for TEORIA DE LOS CIRCUITOS (circuit theory)
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1

Hermione en Hogwarts o sobre el éxito escolar de las niñas

Marrero, Adriana
2008-07-01

Resumen en español Parte de la teoría sociológica en educación ha tendido a enfatizar el carácter reproductor del sistema escolar mostrando cómo la suerte dentro de las instituciones educativas es anticipada por el origen social, bajo una fachada universalista e igualitaria, legitimadora de las desigualdades sociales. Este análisis crítico, originalmente pensado para las diferencias de clase social, ha sido frecuentemente aplicado y utilizado en la esfera de las relaciones de género (mas) . Sin negar los lastres que las mujeres arrastran y deben sortear en el ámbito educativo, sorpresivamente, la experiencia parece indicar que los mecanismos educativos reproductores de la desigualdad de clase social parecen funcionar en forma diferente a la hora de procesar las diferencias de género. Parece, entonces, imprescindible cuestionar y problematizar este tipo de aplicaciones. En este sentido, el objetivo del presente artículo es doble: por un lado, dar cuenta de cuales son los obstáculos que deben superar las mujeres en el circuito educativo; por otro lado, y más relevante aún, señalar algunos de los factores que permiten entender como es que las mujeres logran sortear muy exitosamente dichas dificultades. Para ilustrar algunos de éstos fenómenos que afectan diferencialmente se utiliza la saga de Harry Potter, escrita por J. K. Rowling. Resumen en inglés Sociological Theory of Education has generally emphasized the reproductive character of educative system. That is, in spite of an universal and egalitarian cover, student's luck inside educative institutions is anticipated by social origins. As a result, social inequalities are legitimized. This critical analysis originally thought for social classes differences, has frequently been applied and used in gender relations sphere. Without denying women's "handicaps" in educat (mas) ive institutions, surprisingly, experience seem to indicate that educative mechanisms that reproduce social classes inequalities seem to work out in a different way when processing gender differences. Apparently, it seems urgent and relevant to question this kind of applications. Consequently, this article has a double target: i) on one hand, show which are the obstacles that women must face during their educative circuit; ii) on the other hand, an more important, give account of some of the factors that allow us to understand how women successfully those difficulties. In order to illustrate some of the phenomena that affect in different way women and men, Harry Potter´s story written by J. K. Rowling is used.

Scientific Electronic Library Online (Spanish)

2

Factores motivacionales protectores de la depresión y el consumo de drogas/ Motivational protective factors for depression and drug abuse

García-Aurrecoechea, Raúl; Rodríguez-Kuri, Solveig E.; Córdova Alcaraz, Alberto
2008-12-01

Resumen en español Con el fin de someter a prueba un modelo teórico multifactorial basado en la aproximación clínica de la teoría de la motivación de Maslow -modelo en el que se presupone una relación entre un conjunto de variables psicosociales protectoras y algunos trastornos afectivos, la atracción por las drogas y la severidad de su consumo, mediadas por el grado de satisfacción de ciertas necesidades deficitarias (salud, seguridad y autoestima) así como sensaciones de disfrute (mas) asociado- se llevó a cabo un estudio transversal, ex post facto, con una muestra de 241 adultos jóvenes urbanos, consumidores actuales de drogas ilícitas. Se desarrollaron dos modelos estadísticos con base en las variables antecedentes: capacidad individual de satisfacción, relaciones satisfactorias con la familia y relaciones satisfactorias con los amigos. En ambos modelos se encontró que la capacidad individual de satisfacción predice en cierta medida las relaciones satisfactorias con la familia y con los amigos. La variable mediadora satisfacción de necesidades deficitarias se manifestó en forma distinta en ambos modelos, pues el primero incluyó: a) grado de satisfacción de las necesidades de salud y seguridad, b) grado de satisfacción de necesidades de estima y c) grado de satisfacción de necesidades de disfrute, mientras que el segundo, más parsimonioso, conservó sólo las dos primeras variables manifiestas. Ambos modelos incorporan como variables consecuentes la depresión (explicada en 53% en el modelo 2), así como la severidad del consumo de drogas (explicada en 45% de su varianza en el modelo 2). Además, el modelo incorpora como una variable mediadora la atracción por las drogas con una varianza explicada de 32% en el segundo modelo. Los dos modelos aportan validez conceptual a la vertiente clínica de la teoría de Maslow, pues se verificó que la insatisfacción de las necesidades de deficiencia se relaciona con el surgimiento de trastornos afectivos como la depresión, con el gusto por las drogas legales e ilegales y con la severidad del consumo de alcohol y drogas. Además, se destaca que en el modelo 1 se incluye entre otras la variable mediadora: satisfacción de las necesidades de estima, verificándose con ello la influencia del >, relacionado con el temor al reconocimiento, éxito, etc. El modelo 2, es más parsimonioso y reafirma la importancia de resarcir las necesidades fisiológicas y de seguridad y de su disfrute asociado, antes que proponerse incrementar la satisfacción de necesidades deficitarias de niveles más elevados. Así pues, fue evidente cómo la Capacidad individual de satisfacción se relaciona con la Satisfacción de las necesidades deficitarias, y propicia la aparición de momentos de alegría, diversión y felicidad, posiblemente asociados con la Activación del Circuito de Recompensa (ACR). Del mismo modo, la Capacidad Individual de Satisfacción también mantiene una relación di recta con las relaciones satisfactorias con la familia y con los amigos. Ambas variables tienen, a su vez, una influencia positiva en la satisfacción de las necesidades deficitarias y sensaciones de disfrute asociadas como la risa, el canto y el baile, que se producen en la interacción social. Además, se aprecia cómo en las aptitudes individuales y en las relaciones con el medio se encuentran fuentes sustantivas para la satisfacción de las necesidades deficitarias. También se observa congruencia con respecto al constructo de psicopatogénesis, dado que un grado deficiente de satisfacción de las necesidades se relaciona con un incremento en los trastornos del afecto y en la severidad del consumo de drogas. Finalmente, se detectó cómo un grado deficiente de satisfacción en las necesidades también presenta una relación directa con la atracción por las drogas y se destaca cómo la presencia de trastornos del afecto incrementa el desarrollo de la atracción por las drogas, lo cual aumenta la severidad del consumo de sustancias. Resumen en inglés As a part of a innovative research line on mental health and addictions focused to operationalize the clinical approach of Maslow's motivational theory, this study is focused to prove a theoretical multi-factorial model that presuppose a relationship between a set of psycho-social protective factors and affective disorders, attraction to drugs, and severity of legal and illegal drug use, all them mediated by the satisfaction degree of deficit needs and its pleasurable ass (mas) ociated sensations. The study was implemented with a cross-sectional, ex-post-facto design, with a 241 sample made out by urban young adults that were actual illicit drug users, which used more than five times one of the next drugs: marijuana, cocaine, crack, inhalants, heroin or metamphetamine. These subjects had a 24,5 mean age (SD= 5,1), with a ratio of almost eight men at of each woman. More than half of them were single, a third part was married or lived together and the fifth part was separated or divorced. Half of participants had high school studies, a fourth part had college and 8% had superior level. Half of the subjects were employed, 10% were students, 4% were housemakers, 5% studied and worked simultaneously, and a third part did not work. A fourth part were referred to previous treatment(s) for drug abuse. Based on the diagnosis, marijuana was identified as a drug of greater impact (29,9%), followed by cocaine (27,4%), inhalants (16,2%), heroin (12.0%), crack (10%) and crystal (4,6%). It was applied a battery of instruments that included: a) A scale to test the Severity of drug abuse (alpha = .953), that included items to evaluate issues such as: the incapacity to control drug use; intense desire to use; increase in the consumption; inability to reject drugs; changes in mood; transgression of the rules; residual symptoms; fights, and self injures. b) The Beck Depression Inventory (alpha = .918), conformed by two factors, Affective-cognitive depression (alpha = .867), with items related to feeling punished, failed and guilty, and Physiological-behavioral depression (alpha = .853) with items associated to insomnia, feeling tired, irritable, unsatisfied and hesitated. c) A multifactorial scale of Degree of Satisfaction of Deficit Needs of Health and security (alpha = .876), with items such as: tranquility, confidence, order and education; authenticity (alpha = .878), with items like honesty, sincerity, respect and freedom; affective (alpha = .780), with items like affection, friendship and love; self esteem (alpha = .825), with items like recognition, work, success and money; and enjoyment (alpha = .910), with items like joy, amusement, happiness, play, laugh, sing and dance. d) A multi-factorial risk and protection scale of drug use and related syndromes (alpha = .794), with the following factors: satisfactory family relations (alpha = .850), satisfactory relation with friends (alpha =927) and individual ability for satisfaction (alpha = .841). e) A multi-factorial scale related with the attraction for legal and illegal drugs (alpha = .949), with a factor for alcohol attraction (alpha = .933), other factor for tobacco attraction (alpha = .890) and a factor for alcohol attraction (alpha = .926). Furthermore, two models were developed with three antecedent manifest variables: individual ability for satisfaction, satisfactory family relations and satisfactory relation with friends. Both models showed that individual ability for satisfaction predicts 17% of variance of the satisfactory family relations and 10% of the satisfactory relation with friends. The mediating latent variable Satisfaction degree of deficit needs showed different forms in each model because the first one included a) satisfaction degree of health and security needs, b) satisfaction degree of self esteem needs and c) satisfaction degree of enjoyment needs, whereas the second model, more parsimonious, kept the first two factors. Both models incorporate, as consequent latent variables, depression (explained in 53% of its variance in model 2) as well as the manifest variable of: severity of drug abuse (explained in 45%) and the mediating latent variable attraction for legal and illegal drugs with an explained variance of 32% (for example: >). The models provide conceptual validity to the clinical approach of Maslow's theory, because it verifies that the unsatisfaction of deficit needs is related to: the presence of affective disturbance like depression; the attraction by legal and illegal drugs; and the severity of alcohol consumption and drugs. Model one includes among others the mediating variable satisfaction of the needs of self esteem, showing the influence of Jonah's complex usually related to the fear of recognition, success, etc. Model 2 is more parsimonious and reaffirms the importance of satisfying physiological and security needs, and its associated enjoinment. In adittion, it stands out that the individual capacity of satisfaction is related to the satisfaction of deficit needs causing the appearance of moments of joy, amusement and happiness, possibly associated with the Reward Circuit Activation. On the other hand, the individual capacity of satisfaction also maintains a direct relation with satisfactory relations with family and friends. Both variables have as well a positive influence in the satisfaction of deficit needs. Moreover, the individual capacity of satisfaction is related to the satisfaction of the deficit necessities, causing the appearance of moments of joy, amusement and happiness possibly associated with the reward circuit activation. On the other hand, the individual capacity of satisfaction also maintains a direct relationship with satisfactory relations with family and friends, which have also a positive influence to the satisfaction of the deficit needs and their associated enjoyment sensations, such as laugh, singing and dancing, that usually take place in social interactions. Also, it was shown how the individual aptitudes as well as relationships with others were substantial sources for satisfaction of deficit needs. Additionally, it was observed that a deficient degree of needs satisfaction was related to an increment in affection disturbances and in the severity of drug use, supporting the Maslow's psycho-pathogenesis construct. Finally, it was observed how a deficient degree of satisfaction also shows a direct relationship with the attraction to legal and illegal drugs, and is stand out how the presence of affection disturbances increases the attraction to drugs, which at the same time increases the severity of drug use.

Scientific Electronic Library Online (Spanish)

3

El protagonismo de las Organizaciones no Gubernamentales en las relaciones internacionales: ejemplo de la apertura de espacios de participación a nuevos sujetos internacionales en el siglo XX/ The protagonism of the non Governmental Organizations in international relations: an example of the opening participation scenarios for new subjects, in international arena at the XX century

Amaya-Villarreal, Álvaro Francisco
2008-06-01

Resumen en español El presente texto indaga en un fenómeno de gran relevancia pero poco estudiado en Colombia por la academia en su interés por las relaciones internacionales y el derecho internacional: el ascenso de las Organizaciones no Gubernamentales (ONG) como sujetos de derecho internacional. Estas agrupaciones, cuyo conjunto es denominado por algunos autores "tercer sector", lograron en el siglo XX ganar tal protagonismo que en la actualidad resulta necesario incorporarlas dentro d (mas) el análisis político y jurídico internacional. Por este motivo, el autor aborda desde la perspectiva histórica, y con base en la teoría de la interdependencia, la forma como las ONG lograron abrirse espacios dentro del circuito jurídico internacional. Resumen en inglés This paper explores an significance phenomenon, but little studied by the academy in Colombia: the rise of non-Governmental Organizations (NGOs) as subjects of international law. These clusters, which some authors had called "third sector", in the twentieth century managed to gain such prominence, that in present days it is necessary take into account them in both, the international legal system and international political analysis. For this reason, since an historical pe (mas) rspective, and based on the theory of interdependence,the author explain how NGOs were able to open spaces within the international legal circuit.

Scientific Electronic Library Online (Spanish)

4

Using CAD Tools for Shortening the Design Cycle of High-Performance ΣΔM: A 16.4bit 9.6kHz 1.71mW ΣΔM in CMOS 0.7μm Technology

Medeiro, Fernando ; Pérez Verdú, Belén ; Rosa Utrera, José Manuel de la ; Rodríguez Vázquez, Angel

This paper uses a CAD methodology proposed by the authors to design a low-power 2nd-order Sigma-Delta Modulator (ΣΔM). This modulator has been fabricated in a 0.7μm CMOS technology to be used as the front-end of an energy-metering mixed-signal ASIC and features 16.4 bit at a digital output rate of 9...

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5

Using CAD Tools for Shortening the Design Cycle of High-Performance ΣΔM: A 16.4bit 9.6kHz 1.71mW ΣΔM in CMOS 0.7μm Technology

Medeiro, Fernando; Pérez Verdú, Belén; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Angel
1997-01-01

Digital.CSIC (Spain)

6

Synchronization between populations of neurons

Mirasso, Claudio R.; Gollo, Leonardo L.
2008-09-22

Digital.CSIC (Spain)

7

Sistemas de memoria: reseña histórica, clasificación y conceptos actuales. Segunda parte: Sistemas de memoria de largo plazo: Memoria episódica, sistemas de memoria no declarativa y memoria de trabajo/ Memory systems: Historical background, classification and current concepts. Part two

Carrillo-Mora, Paul
2010-04-01

Resumen en español La memoria episódica (ME) forma parte de los sistemas de memoria declarativa y es considerada como aquella de los sucesos experimentados de forma personal, o sea la memoria del «¿qué?», «¿dónde?» y «¿cuándo?» ocurrió cierto suceso de la experiencia personal. La triada de autonoesis (es decir, la conciencia de que un suceso le ocurrió personalmente), conciencia temporal subjetiva (o el marco temporal subjetivo de cuando ocurrió un suceso y en qué orden) y (mas) la conciencia de sí mismo, son consideradas como requisito indispensable para la definición de la memoria episódica. Hasta hace algunos años la memoria episódica era típicamente considerada como una habilidad exclusiva del ser humano, debido a los procesos cognitivos con los que se asocia, sin embargo, recientemente se ha comprobado que otras especies animales tienen y utilizan eficazmente un sistema análogo al de la ME para resolver diversas tareas de memoria en el laboratorio. Estos modelos experimentales de ME han impulsado la generación de conocimientos acerca de este sistema. La participación del lóbulo temporal, y en especial del hipocampo, en la ME es conocida desde hace tiempo, sin embargo se han identificado diversas áreas cerebrales implicadas en la recuperación y codificación de la información episódica. Una de las más estudiadas actualmente es la corteza parietal posterior, pero existen otras cuyo rol preciso en este tipo de memoria aún no se ha esclarecido. Por otro lado, la otra gran categoría central de la memoria: la no declarativa, contiene diversas subcategorías heterogéneas en su contenido y función, como son: la memoria procedimental, el priming, el aprendizaje asociativo (condicionamiento clásico y operante) y el aprendizaje no asociativo (habituación, deshabituación y sensibilización) mediado por vías reflejas. La memoria procedimental se refiere al almacenamiento y recuperación de información sobre habilidades motoras, es decir, el aprendizaje de «saber cómo hacer» distintas tareas. La memoria procedimental tiene relaciones complejas con la «conciencia», se ha demostrado que presenta un proceso de consolidación off-line, es decir que la información se consolida mejor cuando existe un periodo de reposo entre las sesiones de entrenamiento motor, sobre todo si durante este descanso ocurre el sueño. Existe una serie de estructuras tanto corticales como subcorticales que participan en diversas funciones de la memoria procedimental y cuya lesión selectiva produce distintos trastornos de las funciones motoras, como la parálisis, la apraxia, el temblor, los movimientos coreicos, las distonías, las dismetrías o la ataxia. El priming es un tipo de memoria implícita que no requiere de ninguna recolección consciente de experiencias previas, y que comparte algunas características con la memoria procedimental pero también con la semántica. Se trata de una variedad de memoria en la cual se propone que participan áreas neocorticales de asociación visual. Finalmente, dentro de los sistemas de memoria de corto plazo se encuentra el concepto de memoria de trabajo, propuesto por Baddeley y Hitch, que sigue teniendo aceptación en la actualidad y que es considerado como un sistema encargado de almacenar y administrar transitoriamente toda la información (de distintas modalidades) que se encuentra actualmente en uso para la realización de una tarea específica. Esta memoria de trabajo se conceptualiza como conformada por un componente ejecutivo central y dos sistemas subsidiarios: el circuito fonológico (encargado entre otras cosas del reforzamiento verbal implicado en el aprendizaje del lenguaje) y el esquema visuo-espacial que estaría encargado del almacenamiento transitorio de la información espacial del ambiente externo. El conocimiento científico de la memoria continúa en expansión cotidiana, pero aún estamos lejos de conocer todos los detalles acerca de su funcionamiento desde el nivel molecular hasta el anatómico macroscópico. Sin duda los estudios moleculares y de imagen funcional ofrecerán en el futuro una panorámica más amplia al respecto. Resumen en inglés According to recent evidence, memory can be conceptualized as a series of subsystems working together to reach the same final goal. In the present time, most authors coincide in proposing a main division or long-term memory systems in mammals. This division separates memory in two categories: declarative and not declarative, often conceptualized also as explicit and implicit memories, respectively, although the latter terms are more appropriate to describe the role of con (mas) sciousness during the development of codification and recovery tasks in regard to the information of each system. Declarative memory, as indicated by its name, includes a variety of memories implicating information that can be verbalized and effectively transmitted from person to person. This type of memory is conceptualized as conformed by two distinct memory sub-categories sometimes collaborating and coinciding in the use of memory. The first of these sub-categories is semantic memory, the one including the information about concepts and precise facts, and it is frequently defined as «general knowledge». It also makes reference to conceptual information lacking from the temporal-spatial frame (this issue is detailed in the first part of this paper). The second sub-category is episodic memory, which refers to the memory for personal experienced events, or the memory used for «what?, where?, and when?», in regard to the occurrence of a given personal event. Altogether, autonoesis (the conscious concept of a personally experienced event), subjective temporal consciousness (or subjective temporal frame about when a given event occurred), and self-consciousness are considered indispensable for the definition of episodic memory. In spite of these characteristics, there is yet controversy on whether this type of memory could be observed in animals. In this regard, some researchers have demonstrated that the processes needed to define episodic memory are effectively employed by non-human primates and rodents. In regard to the functional anatomy of episodic memory, an active role of the temporal lobe in the codification of some components of this memory is known from long time ago. Experimental studies employing hippocampal electro-physiological recordings have demonstrated that this region participates in two main components of episodic memory: i) the strong links of the subject with the environment or the spatial context, and ii) the temporal organization of the stored information. Some studies have clearly demonstrated the important participation of specific hippocampal cell areas (CA1 and CA3) for the resolution of behavioral tasks requiring episodic memory. However, clinical studies employing functional imaging have shown a considerable diversity of cortical areas as involved in the several processes of codification or recovery of episodic information, going from prefrontal medial and left ventrolateral regions to medial and lateral temporal regions, retrosplenial cortex, posterior cingulus posterior, and even the cerebellum. Non-declarative memory systems Non-declarative memory contains different categories: procedural memory, priming, associative learning (classic and operant conditioning) and non-associative learning (habituation and sensitization): a) Procedural memory refers to the storage and recovery of information on motor skills, or «know how to do» distinct tasks. Although this type of memory is considered as part of those memory systems often leading to unconscious learning, the relationship between procedural memory and consciousness is more complex. This is due in part to the fact that there is no evidence of a real association between the voluntary (conscious) desire of movement and the activation of motor brain areas. In addition, it has been demonstrated that movements consciously activated to start a given task may difficult the performance of the same task. Moreover, learning of motor skills exhibits a particular characteristic known as consolidation or off-line stabilization. This term refers to those motor skills exhibiting an improvement in performance during the interval of two practice sessions, meaning that the performance is improved if behavior is re-analyzed after an interval of rest typically occurring along the day or during sleep periods. This supports the theory that during sleep periods there is a recapitulation of events taking place during the day, thus favoring the strengthening of neuroplastic mechanisms involved in motor learning. b) Priming is a type of implicit memory not requiring any conscious recollection of previous experiences, and it shares some features with procedural and semantic memories. Similar to procedural memory, priming implies an increase of skills, but in this case, perceptual skills. It is also similar to semantic memory in terms of the involvement of cognitive representations of outdoor environment, and its representation is more cognitive than behavioral. The general characteristics of priming are: i) it is related with the perceptual identification of objects in general terms, including words or concepts; ii) its neuronal substrate is not depending on those brain regions needed for episodic or semantic memories; iii) it is developed early in life and its capacity remains stable all the time; iv) its activity is not related with consciousness and its function is not sufficient to recall a previous experience; v) it is relatively immune to the effects of drugs affecting the other memory systems; vi) its information is distributed in multiple representations of specific words and objects; and vii) the access to this representations is highly specific to each category of objects. Finally, among short-term memory systems, the concept of working memory proposed by Baddeley and Hitch is still accepted in our days, and is characterized by the transitory storage and administration of all kind of information useful for the achievement of a specific task. This system is based on three main components: i) a control system with limited attention capacity, also known as Executive Central Component; ii) the Phonologic Circuit, based on sound and language; and iii) the Visual-Spatial Scheme. The phonologic circuit is responsible for the transitory storage of language information based on sound and it is proponed to play an active role for learning of language. The Visual-Spatial Scheme is important for the visual-spatial representation of objects and their features, which in turn is relevant for the integration of concepts. The Executive Central Component is in charge of controlling the attention and the access to the other two subsidiary components. The knowledge on how the memory systems are functioning is and will remain in constant expansion, given the obvious contribution of recent studies on molecular biology and functional neuroimaging.

Scientific Electronic Library Online (Spanish)

8

Simple analysis and design of a new leaky-wave directional coupler in hybrid dielectric-waveguide printed-circuit technology

Gómez Tornero, José Luis; Martínez López, Sofía; Álvarez Melcón, Alejandro

This paper presents a new theory to analyze and designa novel leaky-wave coupler based on a hybrid dielectric-waveguideprinted-circuit technology. The analysis theory is based ona combined method of moments (MoM) geometrical optics (GO)technique, which makes use of the leaky mode complex propaga...

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9

Simple analysis and design of a new leaky-wave directional coupler in hybrid dielectric-waveguide printed-circuit technology

Gómez Tornero, José Luis; Martínez López, Sofía; Álvarez Melcón, Alejandro

This paper presents a new theory to analyze and designa novel leaky-wave coupler based on a hybrid dielectric-waveguideprinted-circuit technology. The analysis theory is based ona combined method of moments (MoM) geometrical optics (GO)technique, which makes use of the leaky mode complex propaga...

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10

Simple analysis and design of a new leaky-wave directional coupler in hybrid dielectric-waveguide printed-circuit technology

Gómez Tornero, José Luis; Martínez López, Sofía; Álvarez Melcón, Alejandro

This paper presents a new theory to analyze and design a novel leaky-wave coupler based on a hybrid dielectric-waveguide printed-circuit technology. The analysis theory is based on a combined method of moments (MoM) geometrical optics (GO) technique, which makes use of the leaky mode complex propaga...

DRIVER (Spanish)

11

Simple analysis and design of a new leaky-wave directional coupler in hybrid dielectric-waveguide printed-circuit technology

Gómez Tornero, José Luis; Martínez López, Sofía; Álvarez Melcón, Alejandro

This paper presents a new theory to analyze and design a novel leaky-wave coupler based on a hybrid dielectric-waveguide printed-circuit technology. The analysis theory is based on a combined method of moments (MoM) geometrical optics (GO) technique, which makes use of the leaky mode complex propaga...

DRIVER (Spanish)

12

Practical implementation of the spatial images technique for the analysis of shielded multilayered printed circuits

Gómez Díaz, Juan Sebastián; Martínez Mendoza, Mónica; Pérez Soler, Francisco Javier; Quesada Pereira, Fernando Daniel

In this paper, a practical implementation of the spatialimages technique for the analysis of shielded multilayered printedcircuits inside convex cavities is proposed. A new method is introducedin order to automatically locate the images surrounding thestructure in order to impose the appropriate...

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13

Practical implementation of the spatial images technique for the analysis of shielded multilayered printed circuits

Gómez Díaz, Juan Sebastián; Martínez Mendoza, Mónica; Pérez Soler, Francisco Javier; Quesada Pereira, Fernando Daniel

In this paper, a practical implementation of the spatialimages technique for the analysis of shielded multilayered printedcircuits inside convex cavities is proposed. A new method is introducedin order to automatically locate the images surrounding thestructure in order to impose the appropriate...

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14

Photodetection of propagating quantum microwaves in circuit QED

Romero, Guillermo ; García-Ripoll, Juan José ; Solano, Enrique

We develop the theory of a metamaterial composed of an array of discrete quantum absorbers inside a one-dimensional waveguide that implements a high-efficiency microwave photon detector. A basic design consists of a few metastable superconducting nanocircuits spread inside and coupled to a one-dimen...

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15

Photodetection of propagating quantum microwaves in circuit QED

Romero, Guillermo; García-Ripoll, Juan José; Solano, Enrique
2009-12-14

Digital.CSIC (Spain)

16

Photodetection of propagating quantum microwaves in circuit QED

Romero, Guillermo; García-Ripoll, Juan José; Solano, Enrique
2009-01-01

Digital.CSIC (Spain)

18

Numerical evaluation of the green’s functions for cylindrical enclosures by a new spatial images method.

Quesada Pereira, Fernando Daniel; Vera Castejón, Pedro; Cañete Rebenaque, David; Pascual García, Juan; Álvarez Melcón, Alejandro

In this paper, a spatial images technique is usedto efficiently calculate the mixed potential Green’s functionsassociated to magnetic sources when they are placed inside acircular cylindrical cavity. The technique places magnetic dipoleimages and charges outside the cylindrical region. Their str...

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19

Numerical evaluation of the green’s functions for cylindrical enclosures by a new spatial images method.

Quesada Pereira, Fernando Daniel; Vera Castejón, Pedro; Cañete Rebenaque, David; Pascual García, Juan; Álvarez Melcón, Alejandro

In this paper, a spatial images technique is usedto efficiently calculate the mixed potential Green’s functionsassociated to magnetic sources when they are placed inside acircular cylindrical cavity. The technique places magnetic dipoleimages and charges outside the cylindrical region. Their str...

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20

Novel topologies of cascade ΣΔ modulators for low-voltage wideband applications

Morgado, Alonso ; Río Fernández, Rocío del ; Rosa Utrera, José Manuel de la

This work presents two novel topologies ofcascade ΣΔ modulators with unity signal transferfunction that avoid the need of digital filtering in the error cancellation logic. The combination of these two aspects make them highly tolerant to noise leakages, very robust to non-linearities of the circu...

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21

Novel topologies of cascade ΣΔ modulators for low-voltage wideband applications

Morgado, Alonso; Río Fernández, Rocío del; Rosa Utrera, José Manuel de la
2007-08-01

Digital.CSIC (Spain)

22

Novel microwave network for the leaky-wave analysis of evanescent fields in stub-loaded structures

Gómez Tornero, José Luis; Quesada Pereira, Fernando Daniel; Álvarez Melcón, Alejandro

In this paper, a new transverse equivalent networkfor the modal analysis of stub-loaded leaky-wave antennas is developed.The derived network is useful for the study of the radiationof evanescent fields that occurs when they reach the top apertureof the parallel-plate stub. This transverse networ...

DRIVER (Spanish)

23

Novel microwave network for the leaky-wave analysis of evanescent fields in stub-loaded structures

Gómez Tornero, José Luis; Quesada Pereira, Fernando Daniel; Álvarez Melcón, Alejandro

In this paper, a new transverse equivalent networkfor the modal analysis of stub-loaded leaky-wave antennas is developed.The derived network is useful for the study of the radiationof evanescent fields that occurs when they reach the top apertureof the parallel-plate stub. This transverse networ...

DRIVER (Spanish)

24

Nonlinear system identification using additive dynamic neural networks - two on-line approaches

Griñó Cubero, Robert; Cembrano Gennari, Gabriela; Torras Genís, Carme
2000-01-01

Digital.CSIC (Spain)

25

Multifrequency piezoelectric composites: one-dimensional modeling

Sánchez, S.; Montero de Espinosa Freijo, Francisco; Lamberti, N.
1999-02-01

Digital.CSIC (Spain)

26
27

Dynamics of entanglement via propagating microwave photons

Sabín, Carlos; García-Ripoll, Juan José; Solano, Enrique; León, Juan
2010-05-04

Digital.CSIC (Spain)

28

Diseño de un nuevo generador de secuencias de bits aleatorios por entrada de teclado

Alcover Garau, Pedro María; García Carrasco., José M.; Hernández Encinas, Luis
2005-01-01

Digital.CSIC (Spain)

29

Comparative study of chained systems theory and fuzzy logic as a solution for the nonlinear lateral control of a road vehicle

Sotelo, Miguel Angel; Naranjo, José E.; García Rosa, Ricardo; Pedro, Teresa de; González, Carlos
2006-10-18

Digital.CSIC (Spain)

30

Characterisation of fuel cell state using Electrochemical Impedance Spectroscopy analysis

Primucci, Mauricio; Ferrer Arnau, Lluís Jordi; Serra Prat, María; Riera Colomer, Jordi
2008-01-01

Digital.CSIC (Spain)

31
32

Application of the high-gain substrate-superstrate configuration to dielectric leaky-wave antennas

Gómez Tornero, José Luis; Quesada Pereira, Fernando Daniel; Álvarez Melcón, Alejandro

The high-gain substrate-superstrate configuration,which was proposed to increase the gain in printed circuit antennas,is applied to dielectric leaky-wave antennas (LWAs) toimprove its frequency response. Analysis of a slitted suspendeddielectric rectangular waveguide is carried out using a full-...

DRIVER (Spanish)

33

Application of the high-gain substrate-superstrate configuration to dielectric leaky-wave antennas

Gómez Tornero, José Luis; Quesada Pereira, Fernando Daniel; Álvarez Melcón, Alejandro

The high-gain substrate-superstrate configuration,which was proposed to increase the gain in printed circuit antennas,is applied to dielectric leaky-wave antennas (LWAs) toimprove its frequency response. Analysis of a slitted suspendeddielectric rectangular waveguide is carried out using a full-...

DRIVER (Spanish)

34

Analysis and Modeling of the Non-Linear Sampling Process in Switched-Current Circuits - Application to Bandpass Sigma-Delta Modulators

Rosa Utrera, José Manuel de la ; Pérez Verdú, Belén ; Medeiro, Fernando ; Río Fernández, Rocío del ; Rodríguez Vázquez, Angel

This paper presents a precise model for the transient behaviour of Fully Differential (FD) SwItched-current (SI) memory cells placed at the front-end of high-speed A/D interfaces. This model allows us to analyze the main errorsassociated to the S/H process, namely: excess transfer-function delay an...

DRIVER (Spanish)

35

Analysis and Modeling of the Non-Linear Sampling Process in Switched-Current Circuits - Application to Bandpass Sigma-Delta Modulators

Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro, Fernando; Río Fernández, Rocío del; Rodríguez Vázquez, Angel
2001-08-01

Digital.CSIC (Spain)

36

A conductance electrical model for representing and matching weighted undirected graphs

Igelmo Ganzo, Manuel; Sanfeliu Cortés, Alberto; Ferrer Sumsi, Miquel
2010-01-01

Digital.CSIC (Spain)