Active Filtering
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. USING PASSIVE AND ACTIVE MULTISPECTRAL SENSORS ON THE CORRELATION WITH THE PHENOLOGICAL INDICES OF COTTON
ABSTRACT: The investment in precision agriculture technologies has been growing as well the investment in vegetation index sensors with different types of data collection. This study aimed to evaluate the NDVI potential use obtained from passive and active multispectral sensors as phenological parameters indicator of cotton growth. The experiment was conduct
Eng. Agríc.. Publicado em: 2017-08
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2. Experience on a Low Cost Way to Obtainal-Ti Ceramic Foams
An experience on a simple process for producing alumina-rutile-mullite ceramic foams by using aqueous particulate slurries is proposed. The sintering process is achieved in one unique thermal process at 1200 ºC in air. The description of the process, physical properties and morphological studies are reported. Microstructure is studied by using confocal opti
Mat. Res.. Publicado em: 2015-08
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3. Incidence of congenital toxoplasmosis among infants born to HIV-coinfected mothers: case series and literature review
Introduction:There is a paucity of data on the occurrence of congenital toxoplasmosis in children born to mothers dually infected with HIV and Toxoplasma gondii.Objective:To evaluate aspects of the mother–infant pairs associated with vertical transmission of toxoplasmosis in women co-infected with HIV in a referral center for perinatally acquired infection
Braz J Infect Dis. Publicado em: 2014-12
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4. Análise comparativa entre filtros híbridos aplicados a cicloconversores em uma siderúrgica
Em siderúrgicas que utilizam o processo de laminação de tiras a quente, é muito comum o uso de cicloconversores com potências nominais da ordem de megawatts, para o acionamento de motores síncronos. Os cicloconversores absorvem uma corrente distorcida da rede elétrica, causando assim uma distorção de tensão no ponto de acoplamento comum (PAC) e in�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/07/2009
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5. DYNAMIC STYLE ANALYSIS IN RECOVERY OF BRAZILIAN INVESTMENT FUNDS EXPOSURES: AN APPLICATION OF RESTRICTED KALMAN FILTERING / ANÁLISE DINÂMICA DE ESTILO NA RECUPERAÇÃO DAS EXPOSIÇÕES DE FUNDOS DE INVESTIMENTOS BRASILEIROS: UMA APLICAÇÃO DO FILTRO DE KALMAN RESTRITO
This dissertation aims to investigate and interpret the investment style of Brazilian investment funds - exchange funds and stock funds with active management, in the period ranging from January 2004 to August 2008, with the central objective of verifying if, in fact, these funds pursue the investment style promised to their customers. Accordingly, we used t
Publicado em: 2009
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6. Real time methods for positive, negative sequence and/or harmonics extraction. / Método de extração em tempo real de seqüência positiva, negativa e/ou harmônicos.
Harmonics and unbalances cause several problems to equipments connected to AC mains. This work proposes a real time method to obtain the positive and negative sequence components and/or harmonics that requires no coordinate transformation neither signal filtering. Numerical simulation and experimental results are shown to validate the proposed method. As exa
Publicado em: 2007
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7. Adaptive techniques applied to offshore dynamic positioning systems
Dynamic positioning systems (DPS) comprise the deployment of active propulsion to maintain the position and heading of a vessel. Several sensors are used to measure the actual position of the floating body, while a control algorithm is responsible for the calculation of forces to be delivered by each propeller, in order to counteract all environmental forces
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-09
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8. Active learning in systems of colaborativa filtering / Aprendizagem ativa em sistemas de filtragem colaborativa
Nowadays, the amount of available information is much greater than our ability to manage it. There are hundreds of TV channels, dozens of movies on theatres and thousands of products in on-line stores that we can choose from. When we need to take a decision without being able to know all the possible alternatives, a common approach is to rely on recommendati
Publicado em: 2006
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9. Analise teorica e experimental de estrategias de controle ativo de ruido
This work describes applications of the active noise control techniques using adaptive feed forward filtering theory, where the objective is to analyze energetic behavior of the controlled system. The active noise control methods employed are the normalized filtered-X LMS in the time and frequency domain and the Active Sound Intensity Controller (ASIC), whic
Publicado em: 2002
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10. An active service for multicast video distribution
This paper proposes a service for multicast video distribution based on the active network paradigm. Active nodes can provide soft-state and perform customized computations on a per-user or per-application basis. These functionalities allow the deployment of an efficient and flexible service that can dynamically adjusts itself to the bandwidth availability.
Journal of the Brazilian Computer Society. Publicado em: 2000
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11. Comparison of a hair bundle's spontaneous oscillations with its response to mechanical stimulation reveals the underlying active process
Hearing relies on active filtering to achieve exquisite sensitivity and sharp frequency selectivity. In a quiet environment, the ears of many vertebrates become unstable and emit one to several tones. These spontaneous otoacoustic emissions, the most striking manifestation of the inner ear's active process, must result from self-sustained mechanical osc
The National Academy of Sciences.
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12. Pars plana incisions of four patients: histopathology and electron microscopy.
The pathology of pars plana incisions of four patients is described: three with light microscopy and one with light and electron microscopy. Two eyes were removed because of choroidal melanoma, immediately and 8 days after vitrectomy and transvitreous retinal biopsy. Considerable disruption of tissues surrounding the pars plana incisions was observed. Vitreo