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Improvements in closed-section wind-tunnel beamforming experiments of acoustic sources distributed along a line
(2019-12-15)
Phased-array microphone techniques are widely used tools for the measurement and analysis of aeroacoustic noise sources. Nevertheless, beamforming results of sources distributed along a line, such as airfoil trailing-edge ...
Profilometry of semiconductor components by two-colour holography with Bi12TiO20 crystals
(2009-09-14)
We studied the shape measurement of semiconductor components by holography with photorefractive Bi12TiO20 crystal as holographic medium and two diode lasers emitting in the red region as light sources. By properly tuning ...
Profilometry of semiconductor components by two-colour holography with Bi12TiO20 crystals
(2009-09-14)
We studied the shape measurement of semiconductor components by holography with photorefractive Bi12TiO20 crystal as holographic medium and two diode lasers emitting in the red region as light sources. By properly tuning ...
Unusual spectral and temporal characteristics of equatorial electrojet irregularities observed with the Jicamarca VHF radars
(Instituto Geofísico del Perú, Radio Observatorio de Jicamarca, 2005)
Equatorial electrojet (EEJ) field-aligned irregularities have been studied intensively using radars and in-situ rocket-bome sensors since early 1960s. Their main characteristics are well known. For example, two types of ...
Técnicas de dereverberação da fala e redução de ruído com preservação espacial para aparelhos auditivos biauriculares
(2021)
A fala é uma das principais formas de comunicação entre as pessoas. No entanto, a comunica-ção através da fala dificilmente acontece sob condições ideais. Frequentemente, o canal de comunicação existente entre locutor e ...
Interferometría sísmica a partir de registros de un fracturamiento hidráulico orientada a establecer condiciones locales de esfuerzos para la generación de imágenes tomográficas basadas en datos microsísmicos y ruido ambiental
(2015-06-10)
Para la realización de este trabajo se desplegó un arreglo sísmico lineal de 17 acelerómetros triaxiales separados aproximadamente cada 70 m, alineados con la boca de un pozo productor del Campo Chichimene, cuenca Llanos ...