Results 321 to 330 of about 1,340,145 (390)
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Journal of Navigation, 1961
A description is given of sea trials of two types of narrow-beam echo-sounder developed with a view to obtaining information as regards both the depth and the slope of the seabed. One system involves a two-channel interferometric arrangement, which provides a family of several spaced receiving beams; the other uses an eight-element hydrophone array ...
E. A. Howson, J. R. Dunn
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A description is given of sea trials of two types of narrow-beam echo-sounder developed with a view to obtaining information as regards both the depth and the slope of the seabed. One system involves a two-channel interferometric arrangement, which provides a family of several spaced receiving beams; the other uses an eight-element hydrophone array ...
E. A. Howson, J. R. Dunn
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Eos, Transactions American Geophysical Union, 1930
The science of oceanography is so broad that one who is asked to give a paper on some aspect of that science, and himself to choose that aspect, may well find himself embarrassed by the wealth and diversity of the subjects among which he must choose. I consider myself particularly fortunate therefore that this privilege comes to me at a time when at ...
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The science of oceanography is so broad that one who is asked to give a paper on some aspect of that science, and himself to choose that aspect, may well find himself embarrassed by the wealth and diversity of the subjects among which he must choose. I consider myself particularly fortunate therefore that this privilege comes to me at a time when at ...
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The Journal of the Acoustical Society of America, 1985
Echo-sounding apparatus with circuitry for achieving enhanced recording on electrically sensitive paper is disclosed in which the gain of a variable gain amplifier is reduced exponentially depending on the input signal amplitude as soon as this amplitude exceeds a predetermined level.
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Echo-sounding apparatus with circuitry for achieving enhanced recording on electrically sensitive paper is disclosed in which the gain of a variable gain amplifier is reduced exponentially depending on the input signal amplitude as soon as this amplitude exceeds a predetermined level.
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The Journal of the Acoustical Society of America, 1979
An ultrasonic echo sounding technique for reducing unwanted echoes from reflectors outside the focal line of a focused ultrasonic field is disclosed. In this technique at least two pulse-defined ultrasonic waves are successively transmitted. The amplitudes of the said waves are functions of an angle φ which is generated about the axis of the source of ...
Christoph Benedikt Burckhard +2 more
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An ultrasonic echo sounding technique for reducing unwanted echoes from reflectors outside the focal line of a focused ultrasonic field is disclosed. In this technique at least two pulse-defined ultrasonic waves are successively transmitted. The amplitudes of the said waves are functions of an angle φ which is generated about the axis of the source of ...
Christoph Benedikt Burckhard +2 more
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Deep Sea Research (1953), 1955
A short account of an experiment to improve the directional quality of deep water echo sounding equipment. A comparison is made between the results obtained with the pre-war sonic deep water echo sounding set then fitted, and the present-day supersonic type of equipment now installed in the R.R.S. Discovery II.
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A short account of an experiment to improve the directional quality of deep water echo sounding equipment. A comparison is made between the results obtained with the pre-war sonic deep water echo sounding set then fitted, and the present-day supersonic type of equipment now installed in the R.R.S. Discovery II.
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The Chaucer Review, 2006
When Aurelius first appears in the Franklin's Tale, we know he has for several years secretly loved Dorigen, wife of absent Arveragus, although he reveals his love only "somwhat" by "a general compleynyng" in songs (V 944-45).l For the most part, he "dorste nat his sorwe telle" (V 949), and the Franklin emphasizes the squire's lack of speech with ...
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When Aurelius first appears in the Franklin's Tale, we know he has for several years secretly loved Dorigen, wife of absent Arveragus, although he reveals his love only "somwhat" by "a general compleynyng" in songs (V 944-45).l For the most part, he "dorste nat his sorwe telle" (V 949), and the Franklin emphasizes the squire's lack of speech with ...
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Empire Survey Review, 1956
AbstractDuring the period of development of the Port of Mombasa it was desired to find out if silting or scouring were taking place along a certain length of foreshore. A timber marking pile was driven at each of four selected points and the positions of the piles were fixed by intersection.
A. J. Rusk, R. E. C. Griffiths
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AbstractDuring the period of development of the Port of Mombasa it was desired to find out if silting or scouring were taking place along a certain length of foreshore. A timber marking pile was driven at each of four selected points and the positions of the piles were fixed by intersection.
A. J. Rusk, R. E. C. Griffiths
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Automatic Echo-sounding Systems
Journal of Navigation, 1960Dr. Ahrens's paper, which was presented in a more extended version at the meeting in Paris, describes a number of ways in which automatic processes may be applied to, or operated from, echo-sounders.Knowledge of the depth of water is of secondary navigational value to the surface ship since (as compared with the submarine), she has no changes of course
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High-Speed Acoustic Impact-Echo Sounding of Concrete Bridge Decks
, 2020Lorin J. Hendricks +6 more
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