Photon-mediated qubit interactions in one-dimensional discrete and continuous models

In this work we study numerically and analytically the interaction of two qubits in a one-dimensionalwaveguide, as mediated by the photons that propagate through the guide. We develop strategies to assert the Markovianity of the problem, the effective qubit-qubit interactions, and their individual and collective spontaneous emission. We prove the existence of collective Lamb shifts that affect the qubit-qubit interactions and the dependency of coherent and incoherent interactions on the qubit separation. We also develop the scattering theory associated with these models and prove single-photon spectroscopy does probe the renormalized resonances of the singleand multiqubit models, in sharp contrast to earlier toy models in which individual and collective Lamb shifts cancel

A new neural network technique for the design of multilayered microwave shielded bandpass filters

In this work, we propose a novel technique based on neural networks, for the design of microwave filters in shielded printed technology. The technique uses radial basis function neural networks to represent the non linear relations between the quality factors and coupling coefficients, with the geometrical dimensions of the resonators. The radial basis function neural networks are employed for the first time in the design task of shielded printed filters, and permit a fast and precise operation with only a limited set of training data. Thanks to a new cascade configuration, a set of two neural networks provide the dimensions of the complete filter in a fast and accurate way. To improve the calculation of the geometrical dimensions, the neural networks can take as inputs both electrical parameters and physical dimensions computed by other neural networks. The neural network technique is combined with gradient based optimization methods to further improve the response of the filters. Results are presented to demonstrate the usefulness of the proposed technique for the design of practical microwave printed coupled line and hairpin filters

A highly detailed land-use vector map for Madrid region based on photo-interpretation

Land Use – Land Cover (LULC) maps have developed remarkably since the global community became aware of the importance of knowing where LULC change is taking place on the Earth's surface. The rapid evolution of geographic information data handling and the automation of satellite image interpretation through remote sensing techniques and algorithms is providing increasingly abundant and up-to-date information on LULC. In addition, at large detail scales, it is important to link LULC maps to available statistical information, such as census information and business activities, which allow land parcels to be more accurately classified. Though automated classification methods can produce useful maps at smaller detail scales, it is not usually possible to accurately map urban areas at large scales without considerable investment of human resources. The development of large-scale information for urban areas is very important, especially in urban areas with accelerated rates of urban change which may jeopardize natural resources and citizens’ quality of life. In this paper, the creation of a set of large detail scale LULC maps and accompanying geodatabase for one such dynamic urban change region, the Madrid Autonomous Community (AC), Spain, is discussed

El concepto de documento desde una perspectiva interdisciplinar: de la diplomática a la archivística

El objeto de la Diplomática son los documentos, mientras que el de la Archivísitca son los archivos, entendidos como conjuntos organizados de documentos. El concepto de documento ha variado con el paso del tiempo y ha sido empleado con distintos significados por muy diversas disciplinas. El artículo analiza ese concepto desde el punto de vista de la Diplomática, de las Ciencias de la Documentación, de la Historia, del Derecho Administrativo y de la Archivística, y distingue sus principios y elementos para buscar sus similitudes y diferencias.Whereas the object of Diplomatic is documents, that of Archival Sciences is archives in the sense of organized sets of documents. The concept of document has changed in the course of time and has been used with different meanings by very different disciplines. The article analyses this concept from the point of view of Diplomatic, Documentation Sciences, History, Administrative Law, and Archival Science, distinguishing its principles and elements and seeking similarities and differences

Numerical evaluation of the Green's functions for arbitrarily shaped cylindrical enclosures and their optimization by a new spatial images method

IIn this paper, a spatial image technique is used to efficiently calculate the mixed potential Green’s functions associated with electric sources, when they are placed inside arbitrarily shaped cylindrical cavities. The technique is based on placing electric dipole images and charges outside the cavity region. Their strength and orientation are thencalculated by imposing the appropriate boundary conditions for the fields at discrete points on the metallic wall. A method for the assessment of the potentials accuracy is proposed, and several optimization techniques are presented. Three cavities are analyzed to demonstrate the usefulness of the techniques. The cutoff frequencies and potentials patterns are compared to those obtained by a standard finite elements technique, showing excellent agreement. Finally, a band-pass filter based on coupled lines is analyzed, demonstrating the practical value of the technique.This work has been developed with support from the Spanish National Project (CICYT) with reference TEC2004-04313-C02-02/TCM, and the Regional Seneca Project with reference 02972/PI/0

Animal models of maladaptive traits: disorders in sensorimotor gating and attentional quantifiable responses as possible endophenotypes

Traditional diagnostic scales are based on a number of symptoms to evaluate and classify mental diseases. In many cases, this process becomes subjective, since the patient must calibrate the magnitude of his/her symptoms and therefore the severity of his/her disorder. A completely different approach is based on the study of the more vulnerable traits of cognitive disorders. In this regard, animal models of mental illness could be a useful tool to characterize indicators of possible cognitive dysfunctions in humans. Specifically, several cognitive disorders such as schizophrenia involve a dysfunction in the mesocorticolimbic dopaminergic system during development. These variations in dopamine levels or dopamine receptor sensibility correlate with many behavioral disturbances. These behaviors may be included in a specific phenotype and may be analyzed under controlled conditions in the laboratory. The present study provides an introductory overview of different quantitative traits that could be used as a possible risk indicator for different mental disorders, helping to define a specific endophenotype. Specifically, we examine different experimental procedures to measure impaired response in attention linked to sensorimotor gating as a possible personality trait involved in maladaptive behaviors.Ministerio de Economía y Competitividad PSI2012- 3244

Colicin S8 export: extracellular and cytoplasmic colicin are different

The properties of colicin S8 are different for the cytoplasmic, periplasmic and extracellular protein. Interactions with its specific receptors reflect this. Active cell extracts separate into a non-anionic along with an anionic fraction by DEAE-Sephacell chromatography. Previously, we have purified cell-associated colicin S8 as an aggregation of highly related polypeptides; cytoplasmic colicin S8 seems to be post-translationally processed into an aggregation of polypeptides of molecular mass ranging from 45,000 Da to 60,000 Da. We suggest that a conformational change to colicin S8 may occur related to the export process

Spaces of transition: Young people’s social practices in Santa Cruz de Tenerife (Canary Islands, Spain)

Within the context of the growing interest in the study of young people in urban environments, the present article examines their relational spaces in a southern European city: Santa Cruz de Tenerife (Canary Islands, Spain) –with a view to identifying the places they frequent and establishing whether or not the most widely-used ones form a spatial network offering them different recreational opportunities. Combining quantitative and qualitative methods, the paper explores the social practices of young people. The information obtained reveals the significance of open public spaces and shopping malls for young people generally, although differences are seen in their practices according to age, gender and social background. The results also suggest that, in the routes they take and their stays in the aforementioned places, young people create a network of meeting spaces that owes more to the construction of their identity than to the existence of complementary formulas for recreation

Quantitative and ecological study of some grasshoppers population (Orth.: Acridoidea) in Sierra Espuña (Murcia, SE. España)

Utilizando diferentes técnicas estadísticas de análisis multivariante, entre ellas y de manera destacada el análisis binario discriminante («BDA», Binary Discriminat Analysis), se definen grupos ecológicos de poblaciones de saltamontes en relación con los tipos fisionómicos de vegetación de mayor relevancia en Sierra Espuña. Se estudian relaciones entre especies, y se confirma como fundamental el tipo de vegetación como factor ambiental determinante de la distribución de las poblaciones y comunidades de acrídidos. Se esquematizan los resultados de un cuadro-resumen de preferencias: poblaciones de saltamontes- vegetación.Using some different statistical techniques of multivariate analysis, mainly Binary Discriminant Analysis (BDA), ecological groups of grasshoppers populations have been defined and related to the main physiognomic vegetation types of Sierra Espuña. The relationships between species have also been studied and it has been confirmed that the type of vegetation is a fundamental factor in determining the distribution of populations and communities of Acridoidea. Results are summarized in a comprehensive table that shows the preferences of grasshoppers populations and vegetation