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	Provedor de dados 5 (4) 14 (1) 86 (1) Autor Acolas, M (1) Albright, L (1) Begout, Marie-laure (1) CAMARGO,LUIZ SÉRGIO DE ALMEIDA (1) Cancre, F (1) Carlsson, L (1) Choqueuse, Dominique (1) Davies, Peter (1) FERREIRA,ADEMIR DE MORAES (1) LIMA, J. M. de (1) Lehire, J (1) Madsen, P (1) Pomies, F (1) SÁ, M. A. C. de (1) SÁ,WANDERLEI FERREIRA DE (1) VIANA,JOÃO HENRIQUE MOREIRA (1) Velji, M (1) Wahlberg, M (1) Wilson, M (1) Mais... Palavra-chave Ultrasonics (6) Composite materials (2) Materials testing (2) Ship technology (2) Bacteria (1) Bacterial counters (1) Bioacoustics (1) Biocommunications (1) Bovines (1) Contrôle non destructif (1) Disponibilidade de Água (1) Epoxy resins (1) Epoxyde (1) Erodibilidade (1) Erodibility (1) Flocculation (1) Fractures (1) Gir breed (1) Humidité (1) Manejo do Solo (1) Mais... Tipo do documento Text (4) Folhetos (1) Info:eu-repo/semantics/article (1) Ano 2008 (1) 2005 (1) 2000 (1) 1992 (2) 1984 (1) País France (4) Brazil (2) Idioma Inglês (3) Francês (2) Português (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 6 Primeira ... 1 ... Última Allis shad (Alosa alosa) exhibit an intensity-graded behavioral response when exposed to ultrasound 5 Wilson, M; Acolas, M; Begout, Marie-laure; Madsen, P; Wahlberg, M. Most fish cannot hear frequencies above 3 kHz, but a few species belonging to the subfamily Alosinae (family Clupeidae) can detect intense ultrasound. The response of adult specimens of the European allis shad (Alosa alosa) to sinusoidal ultrasonic pulses at 70 and 120 kHz is tested. The fish showed an intensity-graded response to the ultrasonic pulses with a response threshold between 161 and 167 dB re 1 mu Pa (pp) for both frequencies. These response thresholds are similar to thresholds derived from juvenile American shad (Alosa sapidissima) in previous studies, supporting the suggestion that these members of Alosinae have evolved a dedicated ultrasound detector adapted to detect and respond to approaching echolocating toothed whales. (C) 2008 Acoustical... Tipo: Text Palavras-chave: Zoology; Ultrasonics; Biocommunications; Bioacoustics. Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-6118.pdf Dégradation de matériaux composites dans un environment marin: Nouveaux materiaux et methodes d'essais 5 Pomies, F; Carlsson, L; Choqueuse, Dominique; Davies, Peter. The change in composite material properties when these are exposed to a marine environment is of considerable importance to both designers and users of these materials. In this paper new materials are first studied, composites composed of a glass fibre reinforced thermoplastic PPS matrix. It is shown that their poor interfacial resistance to moisture ingress compromises severely the advantage of using a matrix which does not absorb moisture. In the second part of the paper the application of two non-destructive test techniques for following damage development, based on ultrasonic wave propagation and vibration (modal) analysis, are described. These are complemented by first results from a study using fracture mechanics tests to characterise delamination... Tipo: Text Palavras-chave: Fractures; Vibration; Epoxy resins; Tests; Materials testing; Mechanical properties; Ultrasonics; Moisture; Ship technology; Composite materials; Mécanique de la rupture; Vibration; Ultrasonique; Thermoplastique; Epoxyde; Humidité. Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1064.pdf Energia ultra-sônica: uma ferramenta em ciência do solo. 14 SÁ, M. A. C. de; LIMA, J. M. de. ABSTRACT: Ultrasonic energy is a promising tool in soil science. Soil aggregates breakdown susceptibility may have a significant effect on a range of soil physical properties of agronomic importance such as physical properties and erodibility. Soil dispersion characteristics curves give important informations about soil aggregate stability, and are influenced by soil mineralogy, organic matter and soil use and management. Interpretation of dispersion curves and the use of dispersion index and normalized dispersion index for aggregate stability assessment and the use of these indexes to estimate soil erodibility in brazilian soils are discussed. Tipo: Folhetos Palavras-chave: Ultra-som; Erodibilidade; Water availability; Disponibilidade de Água; Manejo do Solo; Solo; Erodibility; Ultrasonics; Soil; Soil management. Ano: 2005 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569997 Follicular dynamics in zebu cattle 86 VIANA,JOÃO HENRIQUE MOREIRA; FERREIRA,ADEMIR DE MORAES; SÁ,WANDERLEI FERREIRA DE; CAMARGO,LUIZ SÉRGIO DE ALMEIDA. The aim of this study was to investigate the follicular dynamics during estrous cycle in Gir breed (Bos indicus) cows. Follicular growth and atresia during estrous cycle were evaluated using a portable ultrasound device. Luteal activity was evaluated by serum progesterone levels. Cycles with two (6.67%), three (60.00%), four (26.67%) and five (6.67%) follicular waves were observed. There was no difference (P>0.05) in dominant or subordinate follicles growth or atresia rates among follicular waves. The maximum diameter of the ovulatory follicle was higher than the diameter of the other dominant follicles in cycles with four waves, and higher than the diameter of the second dominant follicle in cycles with three waves (P<0.05). There was no difference... Tipo: Info:eu-repo/semantics/article Palavras-chave: Bovines; Gir breed; Oestrous cycle; Ovaries; Ovarian follicles; Ultrasonics. Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2000001200021 La qualite du controle par ultra-sons des materiaux composites utilises en construction navale 5 Lehire, J; Cancre, F. Ultrasonic non-destructive testing is frequently used for composite materials. Concerning shipbuilding materials, the observation of the echograms reveals significant acoustic noise which impairs the detection of defects. The usual practice of analysing individual echograms is therefore inadequate. A method based on the intercorrelation function has therefore been developed and tested. The results should allow a classification of materials based on a criterion of the quality expected for each material. Tipo: Text Palavras-chave: Ultrasonics; Ship technology; Composite materials; Materials testing; Ultra sons; Contrôle non destructif; Matériau composite naval. Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1055.pdf The dispersion of adhered marine bacteria by pyrophosphate and ultrasound prior to direct counting. 5 Velji, M; Albright, L. A technique has been investigated for dispersing adhered marine bacteria from various surfaces prior to direct counting. The bacterial cells were initially preserved and strengthened by use of 3.7% formaldehyde (v/v final concentration). Seawater samples were then treated with 0.001 M of tetrasodium pyrophosphate (final concentration), a sequestering and deflocculating agent. Surface sediment and kelp disc samples were treated with 0.01 M tetrasodium pyrophosphate (final concentration) after having been suspended in 0.44 M sodium chloride solution. These samples were incubated for 15-30 min. Subsequently, the samples were treated with ultrasound (100 W) for 30 to 45 s. This technique resulted in an even dispersion of most bacterial cells in the samples.... Tipo: Text Palavras-chave: Bacteria; Microbiological analysis; Flocculation; Ultrasonics; Bacterial counters. Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-968.pdf Registros recuperados: 6 Primeira ... 1 ... Última

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