Spatial Filter
Mostrando 25-36 de 54 artigos, teses e dissertações.
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25. MODELAJE POR FILTROS ESPACIALES DE GRADIÓMETROS SUPERCONDUCTORES ACOPLADOS A SENSORES SQUID / SPATIAL FILTER MODELS FOR SUPERCONDUCTING GRADIOMETERS COUPLED TO SQUID / MODELAGEM POR FILTROS ESPACIAIS DE GRADIÔMETROS SUPERCONDUTORES ACOPLADOS A SENSORES SQUID
Los sensores SQUID(Superconducting Quantum Interference Device)son los detentores más sensibles de flujo magnético conocidos actualmente. Por su elevada sensibilidad, los Squids necesitan ser frecuentemente acoplados a los llamados gradiómetros (conjunto de bobinas supercondutoras conectadas entre sí de forma substrativa) para reducir la contaminación d
Publicado em: 2001
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26. Evaluating factorial kriging for seismic attributes filtering: a geostatistical filter applied to reservoir characterization / Avaliação da krigagem fatorial na filtragem de atributos sismicos : um filtro geoestatistico aplicado a caracterização de reservatorios
In this dissertation the Factorial Kriging analysis for the filtering of seismic attributes applied to reservoir characterizatÍon is considered. Factorial Kriging works in the spatial domain in a similar way to the Spectral Analysis in the frequency domain. The incorporation of filtered attributes via External Drift Kriging and Collocated Cokriging in the e
Publicado em: 1999
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27. APLICAÇÃO DE FILTROS ESPACIAIS À RESTAURAÇÃO DE IMAGENS MAGNÉTICAS OBTIDAS EM ENSAIOS NÃO-DESTRUTIVOS / SPATIAL FILTERS APPLICATION TO THE RESTAURATION OF NON-DESTRUCTIVE ESSAY MAGNETIC IMAGES
Desenvolveu-se uma técnica de restauração de imagens de defeitos existentes em materiais ferromagnéticos, obtidas pela solução do problema inverso para sinais simulados proveniente do método de Ensaios Não-Destrutivos conhecido como Magnetic Flux Leakage. Baseada em princípios de filtragem ótima, a técnica visa reduzir distorções introduzidas na
Publicado em: 1997
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28. Filtragem adaptativa com restrições lineares por minimos quadrados
The basic problem of linear constrained filtering consists In searching ao optimal filter whose parameters are subject to a set of linear equations. For transversal structures, the optimal coefficients In the mean-square sense are given by the Wlener-Hopf equations. The introduction of constraints leads to a modified solution, obtained by the Lagrange multip
Publicado em: 1991
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29. The Pulfrich spatial frequency phenomenon: a psychophysical method competitive to visual evoked potentials in the diagnosis of multiple sclerosis.
The results of a study in which visual evoked responses (VERs) and a modified Pulfrich method were compared showed that both methods are very effective for the diagnosis of multiple sclerosis. With VERs, 97% of the multiple sclerosis cases were diagnosed correctly, while the corresponding value for the Pulfrich method was 93%. In contrast to VERs, the Pulfri
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30. Spatial and temporal properties of human rod vision in the achromat.
The spatial and temporal properties of rod vision were measured for stimuli at and above the detection threshold in an achromat whose spectral sensitivity, dark adaptation, spatial and temporal thresholds and Stiles-Crawford effect suggest the presence of only a normally functioning rod system. The properties of rod and cone vision were compared at illuminan
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31. Spatial and Temporal Analysis of the Microbial Community in Slow Sand Filters Used for Treating Horticultural Irrigation Water
An experimental slow sand filter (SSF) was constructed to study the spatial and temporal structure of a bacterial community suppressive to an oomycete plant pathogen, Phytophthora cryptogea. Passage of water through the mature sand column resulted in complete removal of zoospores of the plant pathogen. To monitor global changes in the microbial community, ba
American Society for Microbiology.
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32. Spatially Oscillating Activity and Microbial Succession of Mercury-Reducing Biofilms in a Technical-Scale Bioremediation System
Mercury-contaminated chemical wastewater of a mercury cell chloralkali plant was cleaned on site by a technical-scale bioremediation system. Microbial mercury reduction of soluble Hg(II) to precipitating Hg(0) decreased the mercury load of the wastewater during its flow through the bioremediation system by up to 99%. The system consisted of a packed-bed bior
American Society for Microbiology.
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33. Spatial-frequency-specific inhibition in cat striate cortex cells.
Responses to single and multiple spatial frequency gratings were recorded from eighty-eight cat striate cortex cells. A cell's response to a grating of its optimum spatial frequency (f) was examined both alone and in the presence of gratings of 1/4, 1/3, 1/2, 2, 3 and 4f, respectively. Some 97% (thirty-seven of thirty-eight) of all simple cells showed signif
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34. A membrane filter method for correlating colposcopic, histological, and cytological pictures: The application to nuclear DNA measurements
A method is described for collecting cells on membrane filters in their natural topographical relationships, so that they can be correlated with exact areas in the cervix and with punch biopsy specimens. The same cell sample, after study with Papanicolaou stain, can then be used for other methods without the cells losing their spatial relationships. An examp
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35. Perceptual asymmetry in texture perception.
A fundamental property of human visual perception is our ability to distinguish between textures. A concerted effort has been made to account for texture segregation in terms of linear spatial filter models and their nonlinear extensions. However, for certain texture pairs the ease of discrimination changes when the role of figure and ground are reversed. Th
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36. An analysis of neural receptive field plasticity by point process adaptive filtering
Neural receptive fields are plastic: with experience, neurons in many brain regions change their spiking responses to relevant stimuli. Analysis of receptive field plasticity from experimental measurements is crucial for understanding how neural systems adapt their representations of relevant biological information. Current analysis methods using histogram e
The National Academy of Sciences.