Variable Structure Control
Mostrando 1-12 de 81 artigos, teses e dissertações.
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1. Effects of ownership structure on the mergers and acquisitions decisions in Brazilian firms
Abstract Purpose The purpose of this study is to examine the effects of ownership structure on merger and acquisition (M&A) decisions of Brazilian listed companies. Design/methodology/approach This paper is an applied and explanatory research based on secondary data. The sample is comprises non-financial companies listed on the BM&FBovespa between 1998 and
RAUSP Manag. J.. Publicado em: 2020-06
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2. Agronomic performance of Marandu grass treated with plant growth biostimulants in the Amazon biome
RESUMO Objetivou-se avaliar o efeito de diferentes doses de dois bioestimulantes sobre a produtividade e a estrutura do dossel do capim Urochloa brizantha cv. Marandu na fase de estabelecimento. O estudo foi realizado na Universidade Federal Rural da Amazônia, Parauapebas, Pará, Brasil. Um módulo de 35 parcelas de 25m² foi estabelecido. Utilizou-se delin
Arq. Bras. Med. Vet. Zootec.. Publicado em: 06/06/2019
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3. Comparing an Ensemble Kalman Filter to a 4DVAR Data Assimilation System in Chaotic Dynamics
ABSTRACT: In this paper, the Ensemble Kalman Filter is compared with a 4DVAR Data Assimilation System in chaotic dynamics. The Lorenz model is chosen for its simplicity in structure and the dynamic similarities with primitive equations models, such as modern numerical weather forecasting. It was examined if the Ensemble Kalman Filter and 4DVAR are effective
J. Aerosp. Technol. Manag.. Publicado em: 2017-12
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4. The Influence of Ownership Concentration on Firm Resource Allocations to Employee Relations, External Social Actions, and Environmental Action
ABSTRACT Objective: The purpose of this work is to examine the influence of ownership concentration on the funds allocated to CSR in Brazilian firm. Design/methodology/approach: Econometric models have been estimated, with an index of CSR as the dependent variable, and ownership concentration as the explanatory variable, together with relevant control va
Rev. bras. gest. neg.. Publicado em: 2015-04
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5. Strength and Durability of Mortar Using Cork Waste Ash as Cement Replacement
Cork powder, the major waste from cork processing industries, is generated from grinding, cutting and finishing operations throughout the industrial cork process. Cork powder has been used mainly as fuel in cork industries. Cork waste ash is usually landfilled but if efficiently used in cement based construction materials it could contribute to sustainabilit
Mat. Res.. Publicado em: 01/07/2014
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6. The determinants of credit rating: brazilian evidence
This study attempts to identify the determinant factors of credit rating in Brazil. The relevance of this proposal is based on the importance of the subject as well as the uniqueness of the Brazilian market. As for originality, the great majority of previous studies regarding credit rating have been developed in the US, UK and Australia; therefore the effect
BAR, Braz. Adm. Rev.. Publicado em: 2014-06
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7. Evolving granular systems = : Sistemas granulares evolutivos / Sistemas granulares evolutivos
In recent years there has been increasing interest in computational modeling approaches to deal with real-world data streams. Methods and algorithms have been proposed to uncover meaningful knowledge from very large (often unbounded) data sets in principle with no apparent value. This thesis introduces a framework for evolving granular modeling of uncertain
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/07/2012
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8. Active vibration control of a piezoelectric beam using PID controller: Experimental study
Vibration suppression of smart beams using the piezoelectric patch structure is presented in the present work. The smart system consists of a beam as the host structure and piezoceramic patches as the actuation and sensing elements. An experimental set-up has been developed to obtain the active vibration suppression of smart beam. The set-up consists of a sm
Lat. Am. j. solids struct.. Publicado em: 2012-12
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9. Uma abordagem indireta para o Controlador em Modo Dual Adaptativo Robusto
Nesse trabalho é proposta uma abordagem indireta para o Controlador em Modo Dual Adaptativo Robusto (DMARC), o qual une as características transitórias e de robustez típicas dos Sistemas a Estrutura Variável, mais especificamente do Controlador Adaptativo por Modelo de Referência e Estrutura Variável (VS-MRAC), com um sinal de controle suave em regime
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/12/2011
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10. Um estudo sobre a relação entre ações preferenciais e valor de mercado das empresas brasileiras de capital aberto / A study about the relation of preferred shares and market value of Brazilian companies
The capital market is characterized by high concentration of power in the hands of few controlling shareholders. In Brazil, the existence of preferred shares without voting rights has motivate the emergence of agency conflict between controlling shareholders and minority shareholders, compounded by the fact that the control can be exercised with a relatively
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/03/2011
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11. Synthesis of a Magneto-Rheological vehicle suspension system built on the variable structure control approach
The synthesis of a magneto-rheological vehicle suspension system built on the variable structure control approach is considered in the present work. The suspension is synthesized in order to improve the ride comfort obtained by a standard passive suspension. Although a nominal half-vehicle model with rigid body is considered in the synthesis of the suspensio
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-12
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12. Modelo logístico generalizado dependente do tempo com fragilidade
Several authors have preferred to model survival data in the presence of covariates through the hazard function, a fact related to its interpretation. The hazard function describes as the instantaneous average of failure changes over time. In this context, one of the most used models is the Coxs model (1972), in which the basic supposition for its use is tha
Publicado em: 2011