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This article introduces the concept of output observer to chaos synchronisation applications. Here output observer is understood as a low order system designed to estimate a single measured variable of a higher order system only. In this work we show how this notion can be used to evaluate nonlinear systems with single output, being a chaotic state variable(More)
—Control of molten steel delivery through the pouring nozzle is critical to ensure an optimum laminar flow pattern in continuous casting, which influences the surface quality, cleanliness , and hence the value of the cast product. A nonintrusive and nonhazardous visualization technique, which uses rugged and noninvasive sensors, would be highly desirable in(More)
– This paper describes the development of an instrument to analyze the phase transformations of hot strip steel using an electromagnetic sensor. The sensor exploits variations in the electrical conductivity and magnetic permeability of the steel to monitor microstructure evolution during processing. The sensor is an inductive device based on a H-shaped(More)
In this paper, we present a strategy for the design of an observer-based indirect speed control for induction motors. We first derive a reduced (3<sup>rd</sup>) order complex differential model for induction motors using the &#x03B1; - &#x03B2; model. For the sake of simplicity, we use this new formulation of the induction motor model as basis for the(More)
This work describes how the transcripts of several non-LTR retrotransposons reach the oocyte nucleus by using the same localisation machinery as endogenous RNAs such as gurken. Visualisation and analysis of I factor retrotransposon localisation reveals that its RNA localises more efficiently than the endoge-nous gurken transcript. We show here that these(More)
In this work we present numerical investigations for a simple data modulating technique employing Colpitts electronic oscillator models operating in the chaotic regime. The procedure includes a low amplitude half-wave rectified sinusoidal function on top of power supply terms, which acts as a message embedded data. We show how the suggested method does not(More)
In this paper, an estimation and control design methodology for biomass concentration in bioreactors is presented. For this, a feedback linearising control was designed to perform biomass regulation. Since the controller depends on the measurements of the biomass concentration, an observer was designed to estimate the latter. After that, an observer and an(More)
In this paper, we present an output observer for single output linear time invariant (LTI) systems based on the temporal state solution of the system. The aim of an output estimator/observer is to reconstruct the output of the system for various purposes, namely fault detection, filtering and output stabilisation among others. A distinctive feature of this(More)