Phase retrieval from experimental far-field intensity data

Contiene: Fórmulas y 5 ilustraciones.We demonstrate the reconstruction of real and positive objects from experimental far-field intensity measurements by means of two phase-retrieval algorithms. Both the iterative Fourier transform and the simulated annealing algorithms are used, and an analysis is made of the advantages and disadvantages of each of these procedures and also of combinations of both methods. The objects tested either were binary or had many gray levels. We worked with data with a considerable amount of experimental noise, and in addition we recognized the importance of taking into account the nonrandom distortions produced by the detecting devices, which can critically bias the results toward erroneous estimates of the objects. Noisy data, however, can create ambiguities in the reconstructions, and hence additional information may be needed to overcome this disadvantage.Supported by the Comision Interministerial de Ciencia y Tecnologia of Spain under grant pbO278. M. J. Pérez-Ilzarbe acknowledges a grant from Ministerio de Educaci6n y Ciencia - This paper was published in Journal of the Optical Society of America A, and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?URI=josaa-7-3-434. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.Peer reviewe

A FORTRAN routine to estimate a function of two variables from its autocorrelation

We describe a simulated annealing routine that yields an estimate of a function of two variables from its autocorrelation. This is equivalent to retrieving the phase from the modulus in Fourier space. © 1993.Work supported by the CICYT under grant PB 0278.Peer Reviewe

Truth and bivalence in Aristotle: an investigation into the structure of saying

The aim of this paper is rather modest: we do not intend to reconstruct Aristotle’s theory of truth (although we are convinced that there is such a thing), and we will not try to settle the issue concerning Bivalence in Aristotle. We merely want, on the one hand, to argue for the consistency between the main Aristotelian texts on truth and a possible rejection of Bivalence; and on the other hand, to investigate the conditions of a possible counterexample to Bivalence. The motivation for this research is also very specific. We are interested in the apparent violation of Bivalence introduced by vague predicates, and in particular we want to respond to a family of arguments put forward by T. Williamson in support of the idea that allowing for exceptions to Bivalence would be incoherent. We have focused on these arguments for two reasons. On the one hand, what is allegedly threatened by a denial of Bivalence is no less than the very “nature of truth or falsity”. On the other hand, Aristotle is explicitly mentioned as one of the defendants of this “natural” conception of truth, and we are reminded about the connection between Aristotle’s theory and Tarski’s semantic conception. These arguments, therefore, give us an occasion to explore Aristotle’s analysis of the nature of truth and falsity, and to examine its connection with the Tarskian conception of truth. In particular, we would like to question the assumption, which has become a commonplace in the field of analytical philosophy, that Aristotle’s notion of truth can be encoded in the pair of disquotational biconditionals that derive from Tarski’s “T schema”

HPLC study of the efficiency of extraction of phenolic compounds

The rate of extraction of phenolic compounds in two different solvents has been studied by liquid chromatography (HPLC) under reverse phase, gradient elution conditions. The solvents were diethyl ether and ethyl acetate. The method has been applied to two natural samples, a white wine and apple pulp.The authors acknowledge the financial support of the Comision Interministerial de Ciencia y Tecnologia (C.I.C.Y.T.).Peer reviewe

Importance of phenolic compounds for the characterization of fruit juices

Several commercial juices of orange, apple, pineapple, peach, apricot, pear, and grape have been analyzed by HPLC and TLC to establish their phenolic composition. Benzoic acids and aldehydes, 3-flavanols, flavonols, chalcones, cinnamic acids, and their derivatives in the form of esters and glycosides have been studied. Hydroxycinnamic acid esters with tartaric acid are typical of grape, phloridzin is typical of apple, and isorhamnetin glycosides are typical of pear. Myricetin is only found in peach, and luteolin and apigenin glucosides are found only in orange. Apricot could be detected by the presence of two coumarins and pineapple by the presence of sinapic acid and the absence of the flavonoids studied in this work.We acknowledge financial support from the Comisión Interministerial de Ciencia y Tecnología (Project ALI91-0468).Peer reviewe

Teoría de la mente en trastornos del neurodesarrollo: más allá del trastorno del espectro autista

Resumen: Introducción: La teoría de la mente (ToM) es la capacidad humana de percibir, interpretar y atribuir los estados mentales de las otras personas y la alteración de esta función cognitiva es un síntoma nuclear del trastorno del espectro autista (TEA). Hay otros trastornos del neurodesarrollo como el trastorno obsesivo-compulsivo de inicio en la infancia (TOC) y el síndrome de Tourette (ST), que pueden presentarse con disfunciones cognitivas, y en los que la ToM ha sido menos estudiada, especialmente en población juvenil. El objetivo de este estudio fue comparar la ToM avanzada entre grupos de jóvenes con diagnóstico de TOC, ST o TEA y un grupo de controles sanos. Métodos: Se entrevistaron clínicamente a varones de entre 11 y 17 años con diagnóstico principal de TOC (n = 19), ST (n = 14), TEA (n = 18), y un grupo control de sujetos sanos (n = 20). Se les administró instrumentos de estimación de cociente intelectual, severidad de los síntomas psiquiátricos y las pruebas para evaluar la ToM: la tarea Historias de la vida cotidiana y el Test de la mirada. Resultados: Los jóvenes con ST presentan dificultades similares para resolver tareas de ToM avanzada al nivel de los pacientes con TEA, a diferencia de los pacientes con TOC de inicio en la infancia que presentan resultados similares a los controles sanos. Conclusiones: La ToM está alterada en otros trastornos del neurodesarrollo más allá del TEA, como en el ST. Abstract: Introduction: Theory of mind (ToM) is the human ability to perceive, interpret, and attribute the mental states of other people, and the alteration of this cognitive function is a core symptom of autistic spectrum disorder (ASD). In such other neurodevelopmental disorders as childhood-onset obsessive-compulsive disorder (OCD) and Tourette syndrome (TS) that can present with cognitive dysfunctions, ToM has been less extensively studied, especially in the young population. The aim of the study was to compare advanced ToM between groups of young people diagnosed with OCD, TS, or ASD and a control group. Methods: Clinical interviews were conducted with male patients aged between 11 and 17 years with a main diagnosis of OCD (n = 19), TS (n = 14), or ASD (n = 18), and a control group (n = 20). We administered instruments for estimating intelligence quotient and severity of psychiatric symptoms, and tasks to evaluate ToM (the “Stories from everyday life” task and the “Reading the mind in the eyes” test). Results: Young people with TS and with ASD present similar difficulties in solving advanced ToM tasks, whereas patients with childhood-onset OCD present similar results to controls. Conclusions: ToM is altered in other neurodevelopmental disorders beyond ASD, such as TS

Theory of mind in neurodevelopmental disorders: beyond autistic spectrum disorder

Introduction: Theory of mind (ToM) is the human ability to perceive, interpret, and attribute the mental states of other people, and the alteration of this cognitive function is a core symptom of autistic spectrum disorder (ASD). In such other neurodevelopmental disorders as childhood-onset obsessive-compulsive disorder (OCD) and Tourette syndrome (TS) that can present with cognitive dysfunctions, ToM has been less extensively studied, especially in the young population. The aim of the study was to compare advanced ToM between groups of young people diagnosed with OCD, TS, or ASD and a control group. Methods: Clinical interviews were conducted with male patients aged between 11 and 17 years with a main diagnosis of OCD (n = 19), TS (n = 14), or ASD (n = 18), and a control group (n = 20). We administered instruments for estimating intelligence quotient and severity of psychiatric symptoms, and tasks to evaluate ToM (the ''Stories from everyday life'' task and the ''Reading the mind in the eyes” test). Results: Young people with TS and with ASD present similar difficulties in solving advanced ToM tasks, whereas patients with childhood-onset OCD present similar results to controls. Conclusions: ToM is altered in other neurodevelopmental disorders beyond ASD, such as TS. Resumen: Introducción: La Teoría de la Mente (ToM) es la capacidad humana de percibir, interpretar y atribuir los estados mentales de las otras personas y la alteración de esta función cognitiva es un síntoma nuclear del Trastorno del Espectro Autista (TEA). Hay otros trastornos del neurodesarrollo como el Trastorno Obsesivo-Compulsivo de inicio en la infancia (TOC) y el Síndrome de Tourette (ST), que pueden presentarse con disfunciones cognitivas, y en los que la ToM ha sido menos estudiada, especialmente en población juvenil. El objetivo de este estudio fue comparar la ToM avanzada entre grupos de jóvenes con diagnóstico de TOC, ST o TEA y un grupo de controles sanos. Métodos: Se entrevistaron clínicamente a varones de entre 11 y 17 años con diagnóstico principal de TOC (n = 19), ST (n = 14), TEA (n = 18), y un grupo control de sujetos sanos (n = 20). Se les administraron instrumentos de estimación de cociente intelectual, severidad de los síntomas psiquiátricos, y las pruebas para evaluar la ToM: la tarea Historias de la Vida Cotidiana y el Test de la Mirada. Resultados: Los jóvenes con ST presentan dificultades similares para resolver tareas de ToM avanzada al nivel de los pacientes con TEA, a diferencia de los pacientes con TOC de inicio en la infancia que presentan resultados similares a los controles sanos. Conclusiones: La ToM está alterada en otros trastornos del neurodesarrollo más allá del TEA, como en el ST