Results 11 to 20 of about 5,046,171 (299)
Target strength of polarized fish [PDF]
, 1987 The effect of behaviour on target strength is simulated through computation of the average target strength with respect to a range of normal orientation distributions. The mean tilt angle is varied from -30 to 30 deg for each of two values of the standard deviation 2 and 5 deg.
Foote, Kenneth G.
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Measuring implementation strength: Literature review draft report 2012 [PDF]
, 2012 Measuring implementation strength (sometimes referred to as implementation intensity) is an important programme evaluation process which helps to understand why some programmes are successful and some fail, attribute outcomes to a programme, and ...
Schellenberg, JA, Bobrova, N, Avan, BI
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In situ target strength observations on haddock [PDF]
, 1986 In situ target strength measurements of ideally resolved haddock have been made using the ES-400 split-beam echo sounder. The measurements are compared with the mean target strength obtained simultaneously by counting / integration. Within the estimated confidence limits of the observation volume in the counting method the two estimates of mean target ...
Ona, Egil, Hansen, Kaare A.
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Krill biomass estimation: Sampling and measurement variability
Frontiers in Marine Science, 2022 Krill are the subject of growing commercial fisheries and therefore fisheries management is necessary to ensure long-term sustainability. Krill catch limits, set by Commission for the Conservation of Antarctic Marine Living Resources, are based on ...
Fiona Bairstow +7 more
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Target strength variability in Atlantic herring (Clupea harengus) and its effect on acoustic abundance estimates [PDF]
, 2011 Acoustic survey techniques are widely used to quantify abundance and distribution of a variety of pelagic fish such as herring (Clupea harengus). The information provided is becoming increasingly important for stock assessment and ecosystem studies ...
Fässler, Sascha M.M.
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Analysis on the influence of submarine's internal tank on the acoustic target strength
Zhongguo Jianchuan Yanjiu, 2019 [Objectives] The influence of submarine's internal tank on the acoustic target strength control is studied.[Methods] The planar element method based on Kirchhoff high frequency approximation was used to calculate and analyze the influence of internal ...
Yan Jiaxiang, Xing Junhua, Zhang Junping
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Research on the Acoustic Scattering Characteristics of Multi-Sections Conning Tower Geometries in Monostatic Configuration [PDF]
Archives of Acoustics, 2022 The overall acoustic echo of a submarine is greatly dependent on the conning tower. For enhancing the acoustic stealth performance of a submarine, it is necessary to research an innovative design scheme of the conning tower to reduce its target strength (
Lin-Jiang Han +4 more
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On the target strength of Baltic clupeids [PDF]
ICES Journal of Marine Science, 2009 Abstract Fässler, S. M. M., and Gorska, N. 2009. On the target strength of Baltic clupeids. – ICES Journal of Marine Science, 66: 1184–1190. The acoustic backscattering of Baltic clupeids, herring and sprat, is explored to improve biomass estimation of these ecologically and commercially important species.
Fässler, Sascha, Natalia Gorska
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Jurnal Teknologi Perikanan dan Kelautan, 2023 Informasi mengenai densitas ikan masih kurang akurat, dikarenakan data yang diperoleh tidak dilakukan pengukuran langsung pada kondisi nyata di perairan.
Muhammad Farhan +2 more
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Modelled target strengths of three lanternfish (family: Myctophidae) in the north east Atlantic based on swimbladder and body morphology [PDF]
, 2015 At mesopelagic depths (200-1000 m), in the oceanic parts of the earth, there are probably the most abundant fish assemblages in the world, often observed on echosounder displays as sound scattering layers extending over vast areas.
Bardarson, Birkir
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