4,171 research outputs found
Nonlinear control of the Chua´s oscillator
No full textEn el presente trabajo se aborda el diseño de controladores para estabilización de puntos de equilibrio y seguimiento de trayectorias para el oscilador de Chua con dinámica caótica. La metodología empleada para sintetizar los controladores es la linealización por retroalimentación del estado y cambio de coordenadas. Se prueba que el oscilador de Chua se puede linealizar entrada-estado y entrada-salida. También se resuelve el problema de acoplamiento a un modelo de referencia, tomando como planta al oscilador de Chua caótico y como modelo de referencia un segundo oscilador de Chua en diversos estados estacionarios. Los controladores diseñados se validan mediante simulaciones y experimentalmente. También se evalúan su robustez ante incertidumbre paramétricas. Se demuestra que los controladores linealizantes diseñados por el oscilador de Chua permiten estabilizarlo entorno a un punto de equilibrio y, también llevar a cabo tareas de seguimiento de trayectorias de dinámica lenta. Se prueba para el acoplamiento a modelos, que el conjunto controlador-planta es capaz de acoplar la dinámica del modelo de referencia.In this work we deal with the design of stabilization and tracking nonlinear controllers for chaotic Chua´s oscillator drive by a control input. We prove that the controlled Chau´s oscillator is input-state and input-output feedback linearizable. We also solve the model-matching problem tanking as the plant the controlled Chau´s oscillator in chaotic regime and as the reference model another Chau´s oscillator (autonomous) in several steady states. The controllers robustness is investigated when there exists some uncertainty in the plants. We show that the feedback linearizable controllers for Chau´s oscillator exhibit good performance in stabilization and slow-dynamics trajectory tracking tasks. Besides we prove that the controller-plant set is able to produce the dynamics of the reference model in the model-matching problem
Anti-inflammation activities of essential oil and its constituents from indigenous cinnamon (Cinnamomum osmophloeum) twigs
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Putting Pressure Under Pressure: On the Status of Classical Pressure in Special Relativity
No full textMuch of the century-old debate surrounding the status of thermodynamics in relativity has centered on the search for a suitably relativistic temperature; recent works by Chua (2023) and Chua and Callender (forthcoming) have suggested that the classical temperature concept – consilient as it is in classical settings – ‘falls apart’ in relativity. However, these discussions typically assume an unproblematic Lorentz transformation for – specifically, the Lorentz invariance of – the pressure concept. Here I argue that, just like the classical temperature, the classical concept of pressure breaks down in relativistic settings. I discuss how this might suggest a new thermodynamic limit – a u → 0 limit – without which an unambiguous thermodynamic
description of systems doesn’t emerge
DISEÑO DE OSCILADORES CAÓTICOS DE CHUA EN MATLAB, MULTISIM Y DSP-BUILDER (DESIGN OF A CHAOTIC OSCILLATORS OF CHUA IN MATLAB, MULTISIM AND DSP-BUILDER)
No full textResumenEste artículo presenta la metodología de diseño del sistema caótico de Chua, en los programas de software Matlab, Multisim y DSP-Builder. La simulación del circuito caótico en Multisim va acompañada del cálculo de cada uno de los componentes electrónicos y las conexiones correspondientes. También se hace uso del software Matlab/Simulink para recrear las ecuaciones diferenciales que representan del sistema de Chua, creando un programa mediante el que se pueden obtener las salidas del sistema, visualizarlas gráficamente y comparar los resultados. De la misma manera se muestran los resultados de la implementación en DSP-FPGA específicamente en un DSP-FPGA Cyclone III Edition de Altera, visualizándose las secuencias y los enrollamientos resultantes en un osciloscopio.Palabras Clave: Caos, DSP-Builder, Matlab, Multisim, Oscilador de Chua. AbstractThis article presents the design methodology of a Chua chaotic system, using the software programs Matlab, Multisim and DSP-Builder. The simulation of the chaotic circuit on Multisim is accompanied by the calculation of each of the electronic components and the corresponding connections. Matlab/Simulink software is also used to represent the differential equations that describe the Chua system, generating a program through the outputs signals can be obtained, graphically visualized and compared the results. In the same way the results of implementation into an DSP-FPGA Cyclone III Edition, Altera, visualizing the output sequences and scrolls.Keywords: Chaos, Chua oscillator, DSP-Builder, Matlab, Multisim
To Make Shakespeare Signify: Notes on Rolando S. Tinio\u27s Makbet
No full textBien! A Festschrift is a feast of words and ideas that pays tribute to one of the most formidable, provocative, and important intellectuals in the Philippines and the field of Philippine Studies: Bienvenido L. Lumbera, National Artist for Literature of the Philippines. The book (in three volumes) presents reflections and commentaries on the great nationalist scholar and his lifework on literature, culture, literacy, and politics. This compendium also provides a selection of critical and creative work that honors the wide range of Lumbera’s interests and achievements.
The contributors in this volume include Reuel M. Aguila, Delia D. Aguilar, Alwin C. Aguirre, Virgilio S. Almario, Merlie Alunan, Mesándel Virtusio Arguelles, Genevieve L. Asenjo, Glecy Atienza, Romulo P. Baquiran, Jr., Joi Barrios, David Jonathan Y. Bayot, Karina Bolasco, Niles Jordan Breis, Rofel G. Brion, Nonon Villaluz Carandang, Jonathan Chua, Kristian Sendon Cordero, Michael M. Coroza, Genaro R. Gojo Cruz, Isagani R. Cruz, Ivery del Campo, Clodualdo del Mundo, Jr., Nick Deocampo, and Gary Devilles
SÍNTESIS DE REDES NO LINEALES: EL OSCILADOR DE CHUA.
No full textIn this paper, we present a method for synthesizing nonlinear circuits with
arbitrarily prescribed dynamics, which are given by differential equations. We
choose an analog circuit design: Chua�s oscillator. That is, we realize the
differential equations by using linear and nonlinear analog elements, which are
commercially available.En este artículo se presenta un método para sintetizar circuitos no lineales con
dinámica formulada arbitrariamente, la cual está dada por ecuaciones
diferenciales. Se escogió el diseño de un circuito análogo: el oscilador de Chua.
Esto es, se realizan las ecuaciones diferenciales usando elementos análogos
lineales y no lineales, disponibles comercialmente
MCFR'22: 1st Workshop on Multimedia Computing towards Fashion Recommendation
No full textWith the proliferation of online shopping, fashion recommendation, which aims to provide suitable suggestions to support the consumer's purchase in e-commerce platforms, has gained increasing research attention from both academia and industry. Although existing efforts have achieved great progress, they focus on the visual modality, lacking the exploration of other modalities of items, e.g., the textual descriptions and attributes of items. Accordingly, this workshop targets calling for a coordinated effort to promote the multimedia computing towards fashion recommendation. This workshop will showcase the innovative methodologies and ideas on new yet challenging research problems, including (not limited to) fashion recommendation, interactive fashion recommendation, interactive garment retrieval, and outfit compatibility modeling
Bilateral comparison between NMC and INRIM on microwave power sensors using type N and 3.5 mm connectors
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