445,800 research outputs found
Causal and Stable Input/Output Structures on Multidimensional Behaviours
No full textIn this work we study multidimensional (nD) linear differential behaviours with a distinguished independent variable called "time". We define in a natural way causality and stability on input/output structures with respect to this distinguished direction. We make an extension of some results in the theory of partial differential equations, demonstrating that causality is equivalent to a property of the transfer matrix which is essentially hyperbolicity of the Pc operator defining the behaviour (Bc)0,y We also quote results which in effect characterise time autonomy for the general systems case. Stability is likewise characterized by a property of the transfer matrix. We prove this result for the 2D case and for the case of a single equation; for the general case it requires solution of an open problem concerning the geometry of a particular set in Cn. In order to characterize input/output stability we also develop new results on inclusions of kernels, freeness of variables, and closure with respect to S,S' and associated spaces, which are of independent interest. We also discuss stability of autonomous behaviours, which we beleive to be governed by a corresponding condition
Relatório Camila Marques e Silva 2018.2
No full textRelato de Atividades referente ao período de Maio a Dezembro de 2018, da bolsista Camila Marques e Silva no Laboratório Virtuhab
Gracielle Marques: entrevista 1151
No full textEntrevista com Gracielle Marques, autora do livro Geografias do drama humano: leituras do espaço em São Bernardo, de Graciliano Ramos, e Pedro Páramo, de Juan Rulfo, publicado pela Editora Unesp.Universidade Estadual Paulista (UNESP), Pós-Graduação em Letras, Faculdade de Ciências e Letras (FCLAS), Assi
Time for Sanctions Against Apartheid South Africa is Now: Statements by H. E. Alhaji Yusuff Maitama-Sule (Nigeria), Chairman of the United Nations Special Committee against Apartheid
No full textH. E. Alhaji Yusuff Maitama-Sule, or Yusuf Maitama Sule, was a Nigerian politician from the 1950s through the 1980s. This document, published by the United Nations Centre Against Apartheid, collates his various statements between September 1981 and July 1982 on apartheid rule in South Africa
A Behavioral Approach to the Control of Discrete Linear Repetitive Processes
No full textThis paper formulates the theory of linear discrete time repetitive processes in the setting of behavioral systems theory. A behavioral, latent variable model for repetitive processes is developed and for the physically defined inputs and outputs as manifest variables, a kernel representation of their behavior is determined. Conditions for external stability and controllability of the behavior are then obtained. A sufficient condition for stabilizability is also developed for the behavior and it is shown under a mild restriction that, whenever the repetitive system is stabilizable, a regular constant output feedback stabilizing controller exists. Next a notion of eigenvalues is defined for the repetitive process under an action of a closed loop controller. It is then shown how under controllability of the original repetitive process, an arbitrary assignment of eigenvalues for the closed loop response can be achieved by a constant gain output feedback controller under the above restriction. These results on the existence of constant gain output feedback controllers are among the most striking properties enjoyed by repetitive systems, discovered in this paper. Results of this paper utilize the behavioral model of the repetitive process which is an analogue of the 1D equivalent model of the dynamics studied in earlier work on repetitive processes
Letter from Marques E. Reitzel (San Jose State College) to John Sloan, September 8, 1941
No full text1 leaf (single sided)Letter from Marques E. Reitzel (San Jose State College) to John Sloan, September 8, 194
Letter from Marques E. Reitzel (San Jose State College) to John Sloan, August 8, 1941
No full text1 leaf (single sided)Letter from Marques E. Reitzel (San Jose State College) to John Sloan, August 8, 194
Letter from Marques E. Reitzel (San Jose State College) to John Sloan, April 19, 1941
No full text2 leaves (single sided)Letter from Marques E. Reitzel (San Jose State College) to John Sloan, April 19, 194
Letter from Marques E. Reitzel (San Jose State College) to John Sloan, August 3, 1941
No full text1 leaf (single sided)Letter from Marques E. Reitzel (San Jose State College) to John Sloan, August 3, 194
Letter from Marques E. Reitzel (San Jose State College) to John Sloan, September 24, 1941
No full text1 leaf (single sided)Letter from Marques E. Reitzel (San Jose State College) to John Sloan, September 24, 194
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