Miguel Mayosky

• PhD
• Professor (Full) at National University of La Plata

The decomplexification procedure allows one to show mathematically (stricto sensu) the equivalence (isomorphism) between the quantum dynamics of a system with a finite number of basis states and a classical dynamics system. This unique way of connecting different dynamics was used in the past to analyze the relationship between the well-known geome...

Systems with non‐Hermitian Hamiltonians, especially those exhibiting parity‐time () symmetry, are of particular interest as they can describe physical open systems with balanced loss into and gain from the environment. In this context, the study of eigenvalue locations and the corresponding phase transitions as a function of the degree of non‐Hermi...

The well-known geometric phase present in the quantum adiabatic evolution discovered by Berry many years ago has its analogue, the Hannay phase, in the classical domain.We calculate the Berry phase with examples for quantum hermitian and non-hermitian $PT$-symmetric Hamiltonians and compare with the Hannay phase in their classical equivalents.We us...

The Hannay geometric phase is the classical analog of the well-known Berry phase. Its most familiar example is the effect of the latitude λ on the motion of a Foucault pendulum. We describe an electronic network whose behavior is exactly equivalent to that of the pendulum. The circuit can be constructed from off-the-shelf components using two match...

p>Systems with non-Hermitian Hamiltonians, specially those exhibiting parity-time (PT ) symmetry, are of particular interest as they describe physical open systems with alanced loss into and gain from the environment. In this context, the study of eigenvalues location and the corresponding phase transitions as a function of the degree of non-Hermit...

p>Systems with non-Hermitian Hamiltonians, specially those exhibiting parity-time (PT ) symmetry, are of particular interest as they describe physical open systems with alanced loss into and gain from the environment. In this context, the study of eigenvalues location and the corresponding phase transitions as a function of the degree of non-Hermit...

Este libro aborda el control de sistemas lineales, invariantes en el tiempo, de una entrada y una salida, continuos y muestreados utilizando la función de transferencia, como formalismo de representación. Analiza la respuesta y estabilidad de sistemas de lazo abierto y cerrado, utilizando diversas metodologías de análisis. Asimismo, detalla diferen...

An electric network whose dynamics is entirely equivalent to the Foucault pendulum is presented. This circuit allows one to measure in a simulation of the circuit, and eventually in a built circuit in the laboratory, the Hannay geometric phase. This phase corresponds, via the equivalence discussed in the text, exactly to the latitude effect on the...

The equivalence between the $\mathrm{Schr\ddot{o}dinger}$ dynamics of a quantum system with a finite number of basis states and a classical dynamics is realized in terms of electric networks. The isomorphism that connects in a univocal way both dynamical systems was applied to the case of neutral mesons, kaons in particular, and the class of electr...

The equivalence between the $\mathrm{Schr\ddot{o}dinger}$ dynamics of a quantum system with a finite number of basis states and a classical dynamics is realized in terms of electric networks. The isomorphism that connects in a univocal way both dynamical systems was applied to the case of neutral mesons, kaons in particular, and the class of electr...

A robust control solution is proposed to solve the air supply control problem in autonomous polymer electrolyte membrane fuel cells (PEMFC) based systems. A Super Twisting controller is designed using a nonlinear model of a laboratory fuel cell test station, even a Lyapunov based stability discussion is included. Subsequently, the proposed control...

This chapter provides an introduction to Variable Structure Control theory and its extension to the so-called Sliding-Mode (SM) control. The presentation is not intended as a comprehensive survey of the state-of-the-art in the field, but to supply the basic concepts on SM control required to understand the developments to come in this book. The rea...

The main purpose is to present the actual development and experimental validation of SOSM controllers, previously reviewed and analysed in this book. As anticipated, the controllers are designed and implemented in the real FC-based generation workbench introduced and modelled in the previous chapter. Three control set-ups based onSuper-Twisting,Twi...

Increasing demands on pollution reduction is driving innovation on clean energy sources. Among these, fuel cells are regarded as one of the most promising technologies, due to their high efficiency, compactness, and reliability. Fuel cells are electrochemical devices that generate electrical current from hydrogen and oxygen. In this chapter, the ba...

The feasibility of SOSM techniques to control PEM fuel cells is evaluated in this chapter. Assessment is accomplished through simulations, using a benchmark model of a fuel cell system for an electric vehicle. The viability of SOSM techniques for oxygen stoichiometry control, with the prime objective of improving the overall energy efficiency, is e...

he control-oriented modelling of an actual PEM fuel cell stack is approached. The proposed procedure tackles the modular modelling of an experimental complex system that combines mechanical, electrical, pneumatic and electrochemical subsystems. It provides a nonlinear characterisation that satisfactorily describes the steady state and dynamical beh...

This chapter summarises the main results presented in the book, regarding the application of Second-Order Sliding-Mode algorithms for robust control of autonomous PEM fuel cells. Several improvements to the existing control schemes and many open directions of research are proposed. Most promising issues are related to Adaptive Super-Twisting algori...

Proton Exchange Membrane (PEM) fuel cells are extensively used for mobile and portable applications. This is due to their compactness, low weight, high power density, and clean, pollutant-free operation. Besides, their low temperature of operation (typically 60–80 degrees Celsius) allows fast starting times, a key feature for automotive application...

Introducing Fuel Cells.- Basics of PEM Fuel Cells.- Fundamentals of Sliding Mode Control Design.- Assessment of SOSM Techniques Applied to Fuel Cell Control.- Control-oriented Modelling and Experimental Validation of a PEMFC Generation System.- SOSM Controller for the PEMFC Generation System: Design and Implementation.- Closing Remarks.

Quality of Mössbauer spectra is strongly related to the performance of source velocity modulator. Traditional electromechanical driving techniques demand hard-edged square or triangular velocity waveforms that introduce long settling times and demand careful driver tuning. For this work, the behavior of commercial velocity transducers and drive uni...

An experimentally validated control-oriented model that reproduces the most typical features of a laboratory proton exchange membrane fuel cell generation system, is presented in this paper. The proposed representation is a 7th order fully analytical nonlinear model of ordinary differential equations, primarily focused on the system gases dynamics....

In this paper, measurements of dielectric properties of fluid-saturated cortical and trabecular bovine bones are presented. Results are reported for native and demineralized states from 80 MHz to 1 GHz. A non invasive technique using open-ended coaxial lines is proposed, and compared to invasive configurations. Measurements are performed in time do...

A robust control solution is proposed to solve the air supply control problem in autonomous polymer electrolyte membrane fuel cells (PEMFC) based systems. Different second order sliding mode (SOSM) controllers are designed using a model of a laboratory test fuel cell generation system. Very good simulation results are obtained using such algorithms...

For the construction of an autonomous robot moving in a real environment, it is necessary to count with a system for the on-line generation of trajectories. An outstanding research area to approach this issue is the evolutive robotics, that resorts to the behavior based control. In this kind of control, a complex robot's behavior can be obtained by...

A control oriented electrochemical static model of a proton exchange membrane fuel cell (PEMFC) stack is developed in this paper. Even though its validation is performed on a specific 7-cell PEMFC stack fed by humidified air and pure hydrogen, the methodology and fit parameters can be applied to different fuel cell systems with minor changes. The f...

High resolution Sigma-Delta Analog-to-Digital Converters (SDADC) have drastically changed traditional analog signal processing stages. However, as the boundary between analog and digital worlds becomes diffuse, a "mixed-signal processing" approach arises. For instance, analog filters, traditionally implemented as independent processing stages can b...

A rotary thermal groundwater flowmeter was studied theoretically and experimentally, and its electrical model was used for searching a linear transference. The velocity measuring range was extended with respect to previous developments, and flow direction estimated by rotating the sensor head of the probe. This instrument was tested under laborator...

This paper deals with the study of scaling up behaviors in evolutive robotics (ER). Complex behaviors were obtained from simple ones. Each behavior is supported by an artificial neural network (ANN)-based controller or neurocontroller. Hence, a method for the generation of a hierarchy of neurocontrollers, resorting to the paradigm of Layered Evolut...

A second-order sliding mode strategy to control the breathing subsystem of a polymer electrolyte membrane fuel cell stack for transportation applications is presented. The controller is developed from a design model of the plant derived from open literature, and well suited for the design of second-order sliding mode strategies. Stability issues ar...

In this paper, estimation of the dielectric properties of layered lossy structure using open-ended coaxial probes is analyzed. Theoretical and empirical exponential approximations of the relaxation process are generalized for two, three and four-layers structures. As measurements are taken in the 10 MHz to 1 GHz frequency range, a wide frequency sp...

Unbalance between electrode-skin impedances is a major problem in biopotential recordings, leading to increased power-line interference. This paper proposes a simple, direct method to measure that unbalance at power-line frequency (50-60Hz), thus allowing the determination of actual recording conditions for biopotential amplifiers. the method is us...

A second order sliding mode strategy to control the air supply and oxygen stoichiometry of a fuel cell based generation system is presented. The control design is accomplished from a complete model of a experimental plant that was previously developed by the authors and specially suited for nonlinear control issues. The resulting controller endows...

In the context of fuel cell stack control a mayor challenge is modeling the interdependence of various complex subsystem dynamics. In many cases, the states interaction is usually modeled through several look-up tables, decision blocks and piecewise continuous functions. Many internal variables are inaccessible for measurement and cannot be used in...

En este trabajo se hace un estudio comparativo de tres diferentes técnicas de control por modo deslizante de segundo orden, aplicadas al problema específico del control de respiración de una pila de combustible PEM. Los algoritmos diseñados se contrastan por simulación utilizando el modelo completo del sistema, poniendo particular énfasis en la res...

In this work, a comparative study of three different second order sliding mode algorithms is performed. These controllers are used to solve the breathing problem of a PEM fuel cell stack. The designed algorithms are validated by simulation using a complete system model, taking into account transient and robustness issues.

Fully differential (F-D) analogue circuits are usually designed focusing only on their differential-mode (DM) behaviour, without considering common-mode (CM) responses. A technique is presented for the design of both DM and CM circuit responses, using fully balanced operational amplifiers (FBOAs) as analogue building blocks. FBOAs work with CM and...

A thermal method for a rapid measurement of groundwater velocity, particularly in aquifers with preferential flow where groundwater velocities over tenths of (m/d) are expected, was studied. Some instruments for measuring groundwater velocity are based on the application of heat. Those consisting of a central heater surrounded by several thermistor...

This work is intended to give an overview of technologies, developed from an artificial intelligence standpoint, devised to face the different planning and control problems involved in trajectory generation for mobile robots. The purpose of this analysis is to give a current context to present the Evolutionary Robotics approach to the problem, whic...

This work is intended to give an overview of technologies, developed from an artificial intelligence standpoint, devised to face the different planning and control problems involved in trajectory generation for mobile robots. The purpose of this analysis is to give a current context to present the Evolutionary Robotics approach to the problem, whic...

A method for analysis and design of Fully-Differential (F-D) analog circuits is presented. It is based on defining a Fully-Balanced Operational Amplifier (FBOA), which works with balanced signals; this is with common mode and differential mode voltages as a whole, allowing analysis and design of both operational modes behaviors. The FBOA can be imp...

In this paper, an analysis of power line interference in two-electrode biopotential measurement amplifiers is presented. A model of the amplifier that includes its input stage and takes into account the effects of the common mode input impedance Z(C) is proposed. This approach is valid for high Z(C) values, and also for some recently proposed low-Z...

Fully differential amplifiers yield large differential gains and also high common mode rejection ratio (CMRR), provided they do not include any unmatched grounded component. In biopotential measurements, however, the admissible gain of amplification stages located before dc suppression is usually limited by electrode offset voltage, which can satur...

AC coupling is essential in biopotential measurements. Electrode offset potentials can be several orders of magnitude larger than the amplitudes of the biological signals of interest, thus limiting the admissible gain of a dc-coupled front end to prevent amplifier saturation. A high-gain input stage needs ac input coupling. This can be achieved by...

A constant-velocity Mössbauer spectrometer with controlled temperature sweep of the sample is presented. The equipment was developed for Mössbauer thermal scanning experiments, allowing the determination of the evolution of the magnetic hyperfine field with temperature. It is based in a three level architecture implemented in a medium sized persona...

Muscle fibre conduction velocity is an important measurement in electrophysiology, both in the research laboratory and in clinical practice. It is usually measured by placing electrodes spaced at known distances and estimating the transit time of the action potential. The problem, common to all methods, is the estimation of this time delay. Several...

A biopotential amplifier for single supply operation is presented. It uses a Driven Right Leg Circuit (DRL) to drive the patient's body to a DC common mode voltage, centering biopotential signals with respect to the amplifier's input voltage range. This scheme ensures proper range operation when a single power supply is used. The circuit described...

A three op-amps instrumentation amplifier (I.A) with active dc suppression is presented. dc suppression is achieved by means of a controlled floating source at the input stage, to compensate electrode and op-amps offset voltages. This isolated floating source is built around an optical-isolated device using a general-purpose optocoupler, working as...

A data acquisition framework based on a RT-Linux host and several embedded processors is presented. A Constant Velocity Mossbauer Spectrometer with controlled temperature sweep is shown as real experimental application. The hardware platform consists of a standard personal computer (PC) supporting several dedicated custom boards. Each board has a m...

Biopotential measurements are very sensitive to electromagnetic interference (EMI). EMI gets into the acquisition system by many ways, both as differential and common mode signals, driven-right-leg circuits (DRL) are widely used to reduce common mode interference. This paper reports an improvement on the classic DRL. The proposed circuit uses a tra...

Grid connected wind energy conversion systems (WECS) present interesting control demands, due to the intrinsic nonlinear characteristics of windmills and electric generators. In this paper a direct adaptive control strategy for WECS control is proposed. It is based on the combination of two control actions: a radial basis function network-based ada...

A data acquisition framework based on a RT-Linux host and several embedded processors is presented. A constant velocity Mossbauer spectrometer with controlled temperature sweep is shown as a real experimental application. The hardware platform consists of a standard personal computer (PC) supporting several dedicated custom boards. Each board has a...

This paper reports the design of an analog neuron circuit with Gaussian activation functions. The circuit is intended to be used for parallel computation of spatial distributed signals like the ones from array sensors (e.g. detectors) and images. The importance of the model is discussed in the context of Radial Basis Function and Regularization the...

Grid connected wind energy conversion systems (WECS) present interesting control demands, due to the intrinsic nonlinear characteristics of windmills and electric generators. In this paper a direct adaptive control strategy for WECS control is proposed. It is based on the combination of two control actions: a radial basis function network-based ada...

Muscle fibre conduction velocity is an important parameter in electrophysiology and also for patient rehabilitation. Its measurement is usually made by placing electrodes spaced at known distances and, somehow, estimating the action potential conduction time. The problem, common to all methods, is how to as accurately as possible estimate the latte...

This paper presents an algorithm that allows a mobile robot to safely navigate in an unknown environment. The parallel characteristics of the computations involved suggest the use of a distributed processing paradigm. Local optimization is used to favor fast response, while global optimization is pursued by making the navigation algorithm a monoton...

The design and implementation of a DSP-based Mossbauer spectrometer is analyzed. A brief description of the Mossbauer effect and its associated instrumentation is given, and the specifications for the acquisition system are discussed. A detailed description of both hardware and software for a specific application is made, showing the tradeoffs invo...

This article proposes a scheme for the on-line adjustment of three mode controller settings based on experimental measurements of closed-loop performance. It uses a recently developed heuristic tuning procedure to identify estimated process parameters. This method may give rise to conflicting estimates. Fuzzy Set theory is applied to manage the sit...

Multilayer perceptrons trained with the generalized delta rule or backpropagation procedure have been extensively applied in areas such as phoneme and image recognition and synthesis. Recently, many authors have reported interesting results on the application of these structures to the modeling and control of dynamical systems. In this article, we...

Parallel systems are wellknown solutions to satisfy the demand of computing capabilities, but parallel computer design involves difficult hardware/software tradeoffs. Standard general purpose parallel architectures don't exist, only some particular architectures are used to solve specific problems. In such complex systems the performance measuremen...

A description is given of a MAP-(Manufacturing-Automation-Protocol-) based LAN (local area network) node implemented in VME. It provides a high-speed communication channel for distributed-intelligence systems. The node has a 20-MHz, 32-bit processor, which executes the software layers of the OSI (Open Systems Interconnection) communications model,...

The VME backplane bus is suitable for use in instrumentation and control crates in industrial environments. The paper describes the implementation of an interface that allows the G64 bus to be used as an I/O section in VME-based crates. The design is implemented in a double Eurocard format using programmable logic devices (PLDs). The interface work...

Resumen— Se presenta un amplificador operacional completamente equilibrado, que opera sobre señales de modo común y de modo diferencial. A diferencia de los amplificadores operacionales completamente diferenciales estándar, en los cuales su comportamiento de modo común está fijado por un lazo interno, el amplificador propuesto permite analizar y di...

Resumen Un problema particular de la adquisición de biopotenciales es la presencia de importantes potenciales de continua (dc) que se presentan al amplificador de biopotenciales (AB) como señales de modo diferencial. Estas tensiones de offset de electrodo se producen en la interfaz electrodo-piel y pueden alcanzar amplitudes de cientos de milivolts...

La rapidez y sencillez con que las actuales herramientas para la construcción de sistemas expertos (shells) permiten diseñarlos, desarrollarlos y ponerlos en funcionamiento, hacen que se los utilize cada vez más en aquellas tareas que requieren de la experiencia humana para su más suficiente desempeño. Sintonizar los parámetros de un controlador ti...

Resumen: En el presente trabajo se desarrolla un modelo dinámico apto para el diseño de control de un sistema de celdas de combustible experimental tipo PEM (Polymer Electrolyte Membrane). El sistema bajo análisis está basado fundamentalmente en una pila ElectroChem de 7 celdas alimentada por un compresor de aire e hidrógeno presurizado, humidifica...

Muscle fibre conduction velocity is an important parameter in electrophysiology and also for patient rehabilitation. Its measurement is usually made by placing electrodes spaced at known distances and, somehow, estimating the action potential conduction time. The problem, common to all methods, is how to as accurately as possible estimate the latte...