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Registros recuperados: 9
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Allis shad (Alosa alosa) exhibit an intensity-graded behavioral response when exposed to ultrasound ArchiMer
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
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Associations between reproductive and carcass traits in Nellore. Repositório Alice
PAULA, E. J. H. de; MARTINS, E. N.; OLIVEIRA, C. A. L. de; MAGNABOSCO, C. de U.; SAINZ, R. D.; GERON, L. J. V.; SOUZA NETO, E. L. de; PORTO, E. de P.; MIGUEL, G. Z..
Objetivou-se com este trabalho estimar os parâmetros genéticos e os componentes de (co)variância para as características de carcaça: peso (PESO), área de olho de lombo (AOL), espessura de gordura subcutânea na garupa (EGP8) e entre a 12a e 13a costelas obtidas por ultrassom (EG); para as características ligadas à reprodução: idade ao primeiro parto (IPP), primeiro intervalo entre partos (PIEP), perímetro escrotal aos 450 e 550 dias de idade (PE450 e PE550) de animais da raça Nelore e verificar as associações entre estas características. Os parâmetros genéticos foram estimados em análises uni e bicaracter, em um modelo animal, por meio da inferência Bayesiana. O modelo utilizado, para todas as características, incluiu o efeito aleatório genético e a idade...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Teoria Bayesiana; Ultrassom; Precocidade sexual; Gado zebu; Gado nelore; Parâmetro genético; Reprodução animal; Carcaça; Bayesian theory; Zebu; Nellore; Genetic traits; Ultrasonics; Reproductive traits; Carcass characteristics.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1037907
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Dégradation de matériaux composites dans un environment marin: Nouveaux materiaux et methodes d'essais ArchiMer
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
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Energia ultra-sônica: uma ferramenta em ciência do solo. Infoteca-e
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: Documentos (INFOTECA-E) Palavras-chave: Solo; Ultra-som; Manejo do solo; Erodibilidade; Disponibilidade de água; Soil; Ultrasonics; Soil management; Erodibility; Water availability.
Ano: 2005 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/569997
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Follicular dynamics in zebu cattle PAB
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
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La qualite du controle par ultra-sons des materiaux composites utilises en construction navale ArchiMer
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
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Perda de solo por erosão em decorrência da ação de adubação fosfatada corretiva sobre a estabilidade de agregados. Repositório Alice
MARTINS, S. G.; SÁ, M. A. C. de; SILVA, M. L. N.; LIMA, J. M. de; OLIVEIRA, A. H.; NÓBREGA, J. C. A.; AVANZI, J. C..
A aplicação de fósforo em solos brasileiros é uma prática frequente e tal operação pode afetar alguns atributos do solo. Assim, com o objetivo de avaliar os efeitos da fosfatagem na estabilidade de agregados e nas perdas de solo por erosão de um Latossolo Vermelho Acriférrico típico de Lavras (MG), foram aplicados, em duas parcelas de 72 m2, o equivalente a 450 kg ha-1 de P2O5 a lanço mais 180 kg ha-1 de P2O5 em linhas. A estabilidade de agregados foi determinada por ultra-som para classes de 7,93 a 4,76; 4,76 a 2,00; 2,00 a 1,00; 1,00 a 0,50; 0,50 a 0,25 e < 0,25 mm, e por peneiramento úmido para a fração de 7,93 a 4,76 mm. Também foi estimada a perda de solo por erosão com uso do sistema de pinos. A fosfatagem reduziu significativamente a estabilidade...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Fosfatagem; Erosão do solo; Ultra-som; Soil erosion; Phosphorus fertilizers; Ultrasonics; Soil aggregation.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/905718
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The dispersion of adhered marine bacteria by pyrophosphate and ultrasound prior to direct counting. ArchiMer
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
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Ultrasonic estimates of fat thicknes and longissimus dorsi muscle depth for predicting carcass composition of live Aragon lambs IPB - Escola Superior Agrária
Delfa, R.; Teixeira, A.; González, C.; Blasco, I..
Six ultrasonic fat and muscle depth measurements, taken on the left and the right side of the fourth lumbar vertebra and third stemebra of the breast bone, were related to carcass composition to determine the accuracy of these measurements for predicting carcass compositon of live Aragdn lambs (Temasco) . Live weight alone accounted for 21, 19,26, 18 and 47% of total variation of muscle, bone plus remainder, total fat, and subcutaneous and intermuscular fat, respectively. Addition of ultrasonic fat depth measurement on the right side of the lumbar region accounted for a further 18,31,33 and 36% of muscle, bone plus remainder, total carcass fat and subcutaneous fat, respectively. Addition of the same measurement taken on the left side accounted for a...
Tipo: Article Palavras-chave: Ultrasonics; Prediction of carcass composition; Aragon lambs.
Ano: 1995 URL: http://hdl.handle.net/10198/798
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