State Observers
Mostrando 13-23 de 23 artigos, teses e dissertações.
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13. Study of speed estimation of induction motor without state observer and Kalman filter / Estudo de estimadores de velocidade de motor de indução com observadores de estado e filtro de Kalman
This works presents through of the simulation a comparative study of the sensorless of speed estimation of induction three-phase motor using state observer and Kalman filter. A comparative analysis of the performance of the deterministic and stochastic estimation strategies using adaptive observers and estimators based on extended Kalman filter was realized.
Publicado em: 2006
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14. Scalar source in circular motion interacting with massive klein-gordon field in Minkowski spacetime
We analyze the scalar radiation emitted by a source in uniform circular motion in Minkowski spacetime interacting with a massive Klein-Gordon field. We assume the source rotating around a central object due to a Newtonian force. By considering the canonical quantization of this field, we use perturbation theory to compute the radiation emitted at the tree le
Brazilian Journal of Physics. Publicado em: 2005-12
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15. What controls verbal responses emitted when a give behavior is observed / O que controlaria respostas verbais diante de um comportamento observado
The tact is a verbal operant in which the response is emitted under control of an antecedent non-verbal stimulus and is maintained by generalized conditioned reinforcement. Technically, a verbal report and an explanation can be considered tacts. Among the tacts one emits, those in which the speaker behaves verbally under the control of another persons behavi
Publicado em: 2005
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16. Tecnicas Whole, Turret e Step no rastreamento do cancer cervical
Objective: To compare Whole, Turret and Step cytological techniques for 100% rapid rescreening to evaluate its performance to detect false negative cases. We also tested RR performance among cytologists specifically trained for RR and for cytologists without training for RR. Methods: This is a descriptive study and diagnostic test validation. We analyze thre
Publicado em: 2004
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17. Populações de psittacidae no Parque Estadual Mata dos Gody, fragmento de floresta atlântica no norte do Estado do Paraná, Brasil
Atlantic Forest in north of Paraná State Brazil has been almost completely depleted since the first half of XX century. Nowadays, only a few native forest remnants remains, most in private lands. The Godoy State Park is one of the biggest and most representative fragments that are left, and it is under governmental protection. This study aimed to asses popu
Publicado em: 2003
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18. Faults detection and isolation using reduced-order state observers / Detecção e localização de falhas via observadores de estado e de ordem reduzida
The development of new faults detection techniques is necessary because of increasing demands from industries on reliability and safety in mechanical systems. They must be supervised such that occurrence of failures can be accommodated as quickly as possible because they can cause an unacceptable deterioration of the systems performance. In this work, we hav
Publicado em: 1998
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19. Estrategias de detecção e diagnostico de falhas em sistemas dinamicos
Analytical redundancy for fault detection and diagnosis of dynamic systems, FDD, has been approached by several methodologies, state estimation, parameter estimation, expert systems, and pattern classification and recognition being typical examples. In particular, pattern classification and recognition methods adopt probabilistic, heuristic, neural, and fuzz
Publicado em: 1997
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20. Modelamento e observador discretos não-estacionarios para a maquina de indução
In this work a procedure is proposed for obtaining a discrete state model for the indudion machine based on the two-axis continuous model. The performance of the discrete model is then discussed; it is compared to the continuous modeI and to the discrete model obtained through Euler s method. Next, the proposed discrete model is applied in the design and imp
Publicado em: 1992
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21. Comparison of 2 interferometers for predicting visual acuity in patients with cataract.
Two clinical interferometers generated gratings directly on to the retina in young experienced observers and also in patients about to undergo cataract surgery. Eyes in the patients with no media opacities were used as controls. We agreed with the manufacturers' claims that gratings are seen on the retina independent of refractive state and that gratings can
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22. Past trials influence perception of ambiguous motion quartets through pattern completion
There are many celebrated examples of ambiguous perceptual configurations such as the Necker cube that abruptly and repeatedly “switch” among possible perceptual states. When such ambiguous configurations are presented intermittently, observers tend to see the same perceptual state on successive trials. The outcome of each trial apparently serves to “p
National Academy of Sciences.
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23. Comparative study of leg wound skin closure in coronary artery bypass graft operations.
A prospective randomised study of four different methods of leg wound skin closure after removal of the long saphenous vein was carried out in 113 patients undergoing coronary artery bypass grafting. These methods were: (1) continuous nylon vertical mattress suture (27 patients); (2) continuous subcuticular absorbable (Dexon) suture (29 patients); (3) metal