Universal behaviour in a ``modulated'' logistic map

We study the period-doubling bifurcations to chaos in a logistic map with a nonlinearly modulated parameter and show that the bifurcation structure is modified significantly. Using the renormalisation method due to Derrida et al. we establish the universal behaviour of the system at the onset of chaos.

Modeling and Analysis of Some Heavy Tailed Time Series

The thesis has covered various aspects of modeling and analysis of finite mean time series with symmetric stable distributed innovations. Time series analysis based on Box and Jenkins methods are the most popular approaches where the models are linear and errors are Gaussian. We highlighted the limitations of classical time series analysis tools and explored some generalized tools and organized the approach parallel to the classical set up. In the present thesis we mainly studied the estimation and prediction of signal plus noise model. Here we assumed the signal and noise follow some models with symmetric stable innovations.We start the thesis with some motivating examples and application areas of alpha stable time series models. Classical time series analysis and corresponding theories based on finite variance models are extensively discussed in second chapter. We also surveyed the existing theories and methods correspond to infinite variance models in the same chapter. We present a linear filtering method for computing the filter weights assigned to the observation for estimating unobserved signal under general noisy environment in third chapter. Here we consider both the signal and the noise as stationary processes with infinite variance innovations. We derived semi infinite, double infinite and asymmetric signal extraction filters based on minimum dispersion criteria. Finite length filters based on Kalman-Levy filters are developed and identified the pattern of the filter weights. Simulation studies show that the proposed methods are competent enough in signal extraction for processes with infinite variance.Parameter estimation of autoregressive signals observed in a symmetric stable noise environment is discussed in fourth chapter. Here we used higher order Yule-Walker type estimation using auto-covariation function and exemplify the methods by simulation and application to Sea surface temperature data. We increased the number of Yule-Walker equations and proposed a ordinary least square estimate to the autoregressive parameters. Singularity problem of the auto-covariation matrix is addressed and derived a modified version of the Generalized Yule-Walker method using singular value decomposition.In fifth chapter of the thesis we introduced partial covariation function as a tool for stable time series analysis where covariance or partial covariance is ill defined. Asymptotic results of the partial auto-covariation is studied and its application in model identification of stable auto-regressive models are discussed. We generalize the Durbin-Levinson algorithm to include infinite variance models in terms of partial auto-covariation function and introduce a new information criteria for consistent order estimation of stable autoregressive model.In chapter six we explore the application of the techniques discussed in the previous chapter in signal processing. Frequency estimation of sinusoidal signal observed in symmetric stable noisy environment is discussed in this context. Here we introduced a parametric spectrum analysis and frequency estimate using power transfer function. Estimate of the power transfer function is obtained using the modified generalized Yule-Walker approach. Another important problem in statistical signal processing is to identify the number of sinusoidal components in an observed signal. We used a modified version of the proposed information criteria for this purpose.

Molecular genetic characterization of endemic red -tailed barb,Gonoproktoptems curmuca (Hamilton - Buchanan, 1807)

The family Cyprinidae is the largest of freshwater fishes and, with the possible exception of Gobiidae, the largest family of vertebrates.Various members of this family are important as food fish, as aquarium fish, and in biological research. In this study, a fish species from this family exclusively found in the west flowing rivers originating from the Western Ghat region — Gonoproktopterus curmuca — was taken for population genetic analysis.There was an urgent need for restoration ecology by the development of apt management strategies to exploit resources judiciously. One of the strategies thus developed for the scientific management of these resources was to identify the natural units of the fishery resources under exploitation (Altukov, 1981). These natural units of a species can otherwise be called as stocks. A stock can be defined as a panmictic population of related individuals within a single species that is genetically distinct from other such populations.It is believed that a species may undergo micro evolutionary process and differentiate into genetically distinct sub-populations or stocks in course of time, if reproductively and geographically isolated.In recent times, there has been a wide spread degradation of natural aquatic environment due to anthropogenic activities and this has resulted in the decline and even extinction of some fish species. In such situations, evaluation of the genetic diversity of fish resources assumes important to conservation.The species selected for the study, was short-listed as one of the candidates for stock-specific, propagation assisted rehabilitation and management programme in rivers where it is naturally distributed. In connection with this, captive breeding and milt cryopreservation techniques of the species have been developed by the National Bureau of Fish Genetic Resources, Lucknow. However, for a scientific stock-specific rehabilitation programme, information on the stock structure and basic genetic profile of the species are essential and that is not available in case of G. curmuca. So the present work was taken up to identify molecular genetic markers like allozymes, microsatellites and RAPDs and, to use these markers to discriminate the distinct populations of the species, if any, in areas of its natural distribution. The genetic markers were found to be powerful tools to analyze the population genetic structure of the red-tailed barb and demonstrated clear cut genetic differentiation between pairs of populations examined. Geographic isolation by land distance is likely to be the factor that contributed to the restricted gene flow between the river systems. So the present study emphasizes the need for stock-wise, propagation assisted-rehabilitation of the natural populations of red-tailed barb, Gonoprokfopterus curmuca.

Studies on the universal parameters and onset of chaos in dissipative systems

It has become clear over the last few years that many deterministic dynamical systems described by simple but nonlinear equations with only a few variables can behave in an irregular or random fashion. This phenomenon, commonly called deterministic chaos, is essentially due to the fact that we cannot deal with infinitely precise numbers. In these systems trajectories emerging from nearby initial conditions diverge exponentially as time evolves)and therefore)any small error in the initial measurement spreads with time considerably, leading to unpredictable and chaotic behaviour The thesis work is mainly centered on the asymptotic behaviour of nonlinear and nonintegrable dissipative dynamical systems. It is found that completely deterministic nonlinear differential equations describing such systems can exhibit random or chaotic behaviour. Theoretical studies on this chaotic behaviour can enhance our understanding of various phenomena such as turbulence, nonlinear electronic circuits, erratic behaviour of heart and brain, fundamental molecular reactions involving DNA, meteorological phenomena, fluctuations in the cost of materials and so on. Chaos is studied mainly under two different approaches - the nature of the onset of chaos and the statistical description of the chaotic state.

Automated synthesis of delay-reduced Reed-Muller universal logic module networks

This paper presents a new approach to implement Reed-Muller Universal Logic Module (RM-ULM) networks with reduced delay and hardware for synthesizing logic functions given in Reed-Muller (RM) form. Replication of single control line RM-ULM is used as the only design unit for defining any logic function. An algorithm is proposed that does exhaustive branching to reduce the number of levels and modules required to implement any logic function in RM form. This approach attains a reduction in delay, and power over other implementations of functions having large number of variables.

Labelling schemes for organic food: Consumer attitudes, preferences and willingness-to-pay in six European countries

Since July 2010, all pre-packed organic food produced in the European Union (EU) must carry the new mandatory EU logo for organic food. Voluntary organic labels (such as national governmental logos and logos of private farmers’ associations and control bodies) can still be used, but only in addition to the mandatory EU logo. This change in the regulatory environment of organic labelling raises a number of questions regarding consumer preferences for different kinds of organic certification logos, which the present dissertation addressed. The first objective was to explore and analyse consumer perceptions, attitudes, preferences and willingness-to-pay (WTP) regarding different voluntary organic labels. The second objective was to investigate consumer perceptions and attitudes towards a mandatory EU logo. A combination of qualitative and quantitative methods of consumer research in six European countries was employed including focus group discussions, choice experiments and structured interviews. Based on the empirical results, recommendations are drawn for different actors in the organic sector.

Configuraci??n de una Secci??n Documental de Aula para Primer Curso de ESO

Resumen basado en el de la publicaci??n

Autoedición de material curricular del área de lengua castellana y literatura, para el aprendizaje y motivación de la lectura y recuperación de los problemas de comunicación en las etapas de Educación Infantil y primer ciclo de Educación Primaria.

Se presenta memoria final de proyecto educativo que propone la recopilación de las producciones literarias elaboradas en el aula e intercambiarlas con otros centros como recursos educativos de interés, utilizando nuevas tecnologías informáticas. Se realiza en el CEIP La Esperanza en Cantillana, Sevilla. Los objetivos son: intercambiar experiencias entre centros educativos; utilizar las nuevas tecnologías como una herramienta al servicio de la educación y de la creación curricular; elaborar recursos didácticos contextualizados; implicar a las familias en una dinámica rica en estímulos orales y escritos en coherencia con el paradigma de lectura emergente. El proceso consta de varias fases: 1, aprendizaje y familiarización con aplicaciones de maquetación y edición; 2, reuniones con el equipo técnico de coordinación pedagógica para plantear los recursos que se iban a desarrollar.

Compensación de deficiencias y enriquecimiento del lengauje oral en educación infantil y primer ciclo de educación primaria.

Se pone en marcha en las aulas de infantil y del primer ciclo de primaria una serie de estrategias y actividades para fomentar el desarrollo de las capacidades orales de este alumnado a fin de superar carencias derivadas del entorno en que viven y de mejorar sus resultados académicos.

El Inglés en Ed. Infantil y primer Ciclo de Primaria.

Apuesta, de toda la comunidad educativa, por abordar el aprendizaje de la lengua inglesa desde los tres años. El proyecto va dirigido al segundo ciclo de Ed. Infantil y primer ciclo de primaria, que es el tramo en el que no se contempla la obligatoriedad de un segundo idioma.

Recursos para el desarrollo lógico-matemático en la educación infantil y primer ciclo de educación primaria.

Se ha llevado a cabo un proceso de elaboración, experimentación y evaluación de recursos para favorecer el razonamiento lógico y la construcción de conceptos matemáticos. La intervención se ha realizado con alumnos y alumnas de educación infantil y primer ciclo de Primaria. La idea, el diseño y la elaboración de estos recursos han partido de las autores de este proyecto, así como la secuenciación de los mismos adecuándolos a los diferentes niveles educativos. Se ha pretendido dar respuesta a las siguientes necesidades: prevenir y solucionar las dificultades que plantea al alumnado el área de matemáticas; compensar las carencias derivadas de un contexto desfavorecido incorporando al aula materiales motivadores y nuevas tecnologías; mantener una línea de continuidad metodológica entre infantil y primaria; y dotar al aula de recursos manipulativos que favorezcan la motivación, la experimentación y la autonomía por parte del alumnado.

Tratamiento educativo espec??fico para alumnos y alumnas del primer ciclo de la ESO que presentan desmotivaci??n, desinter??s y rechazo al medio escolar

Esta experiencia se plantea desde la realidad circundante. Busca para el alumnado no integrado y aburrido por la actividad educativa una serie de actividades que los instruya a la par de que los divierta, de forma que no se produzca el fen??meno de desintegraci??n entre alumnos y alumnas que podr??an alcanzar un correcto nivel de aprendizaje y formaci??n, llevados por el grupo que no tiene expectativas ante su formaci??n.

Intervención educativa en el primer año de vida.

Documento elaborado por los Equipos de Atención Temprana de la Región de Murcia. El trabajo se desarrolla en cuatro capítulos donde se recogen las distintas áreas de estudio: exposición global del trabajo que realizan estos equipos; evolución normal del niño en su primer año de vida; aspectos preventivos en función de factores de riesgo y alto riesgo y orientación familiar; modelos de aplicación, práctica y conclusiones en las que se recogen una serie de propuestas de mejora en la calidad de la atención durante el primer año de vida.