Now showing items 223-242 of 977

    • Design of a controllable pitch underwater thruster system 

      Keefe, Robert W. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1993-08)
      Control systems for underwater vehicles have reached the level of sophistication where they are limited by the dynamic performance of the thrust actuators. Standard fixed-pitch propellers have been shown to have very ...
    • Design of a stable floating platform for air-sea interaction measurements 

      Berteaux, Henri O.; Walden, Robert G. (Woods Hole Oceanographic Institution, 1978-12)
      The design of an oceanographic platform can be defined as the rational specification of the platform dimensions and geometry. This specification is usually the result of an iterative process which compares the ...
    • The design of a surface launch and recovery fender for DSRV "Alvin" 

      O'Sullivan, James Francis (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1973-09)
      Surface recovery of small submersibles could be made safer for personnel and hardware with the installation on the submersible of an inflatable, pneumatic bumper which acts also as main surface buoyancy. Tne use of such ...
    • The design of an instrument to measure vertically averaged oceanic currents using geomagnetic electric fields 

      Poranski, Peter Frank (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1972-08)
      A bottom mounted electromagnetic current meter measures the vertically-averaged conductivity-weighted velocity. This measurement complements free-fall relative velocity profiles and is valuable for transport determination ...
    • Detachment shear zone of the Atlantis Massif core complex, Mid-Atlantic Ridge, 30°N 

      Karson, J. A.; Fruh-Green, G. L.; Kelley, Deborah S.; Williams, E. A.; Yoerger, Dana R.; Jakuba, Michael V. (American Geophysical Union, 2006-06-21)
      Near-bottom investigations of the cross section of the Atlantis Massif exposed in a major tectonic escarpment provide an unprecedented view of the internal structure of the footwall domain of this oceanic core complex. ...
    • Detecting Atlantic herring by parametric sonar 

      Godø, Olav Rune; Foote, Kenneth G.; Dybedal, Johnny (Acoustical Society of America, 2010-03-17)
      The difference-frequency band of the Kongsberg TOPAS PS18 parametric sub-bottom profiling sonar, nominally 1–6 kHz, is being used to observe Atlantic herring. Representative TOPAS echograms of herring layers and schools ...
    • Detection and characterization of deep water wave breaking using moderate incidence angle microwave backscatter from the sea surface 

      Jessup, Andrew T. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1990-05)
      The importance of wave breaking in both microwave remote sensing and air-sea interaction has led to this investigation of the utility of a Ku-Band CW Doppler scatterometer to detect and characterize wave breaking in the ...
    • Detection and quantification of oil under sea ice : the view from below 

      Wilkinson, Jeremy P.; Boyd, Tim; Hagen, Bernard; Maksym, Ted; Pegau, Scott; Roman, Christopher N.; Singh, Hanumant; Zabilansky, Leonard (Elsevier, 2014-08-21)
      Traditional measures for detecting oil spills in the open-ocean are both difficult to apply and less effective in ice-covered seas. In view of the increasing levels of commercial activity in the Arctic, there is a growing ...
    • Determination of gas bubble fractionation rates in the deep ocean by laser Raman spectroscopy 

      White, Sheri N.; Brewer, Peter G.; Peltzer, Edward T. (2004-10-29)
      A new deep-sea laser Raman spectrometer (DORISS – Deep Ocean Raman In Situ Spectrometer) is used to observe the preferential dissolution of CO2 into seawater from a 50%-50% CO2-N2 gas mixture in a set of experiments that ...
    • The determination of the elastic modulus of rubber mooring tethers and their use in coastal moorings 

      Irish, James D.; Paul, Walter; Wyman, David M. (Woods Hole Oceanographic Institution, 2005-12)
      Compliance must be supplied to any surface mooring to allow the buoy to move with the waves and currents, and remain moored in position. This can be supplied with a traditional chain catenary or newer compliant elastic ...
    • Determining dominant scatterers of sound in mixed zooplankton populations 

      Lavery, Andone C.; Wiebe, Peter H.; Stanton, Timothy K.; Lawson, Gareth L.; Benfield, Mark C.; Copley, Nancy J. (Acoustical Society of America, 2007-12)
      High-frequency acoustic scattering techniques have been used to investigate dominant scatterers in mixed zooplankton populations. Volume backscattering was measured in the Gulf of Maine at 43, 120, 200, and 420 kHz. ...
    • Determining the extinction cross section of aggregating fish 

      Foote, Kenneth G.; Ona, Egil; Toresen, Reidar (Acoustical Society of America, 1992-04)
      When fish are aggregated over a flat bottom, and fish and bottom echoes can be distinguished, it is possible to determine the fish extinction cross section by a simple application of the echo integration method. The theory ...
    • Development and application of a field instrumentation system for the investigation of surf zone hydrodynamics 

      Greer, Matthew Noble (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1979-02)
      The development and application of an autonomous field instrumentation system consisting of four current meters and four wave gauges, along with a field monitor and digital recorder, is documented. The flow sensors are ...
    • The development and application of random matrix theory in adaptive signal processing in the sample deficient regime 

      Pajovic, Milutin (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2014-09)
      This thesis studies the problems associated with adaptive signal processing in the sample deficient regime using random matrix theory. The scenarios in which the sample deficient regime arises include, among others, the ...
    • Development and assessment of a new dermal attachment for short-term tagging studies of baleen whales 

      Baumgartner, Mark F.; Hammar, Terence R.; Robbins, Jooke (John Wiley & Sons, 2014-12-18)
      Current studies of fine-scale baleen whale diving and foraging behaviour rely on archival suction cup tags that remain attached over time scales of hours. However, skin irregularities can make suction cup attachment ...
    • Development and deployment of a precision underwater positioning system for in situ laser Raman spectroscopy in the deep ocean 

      White, Sheri N.; Kirkwood, William; Sherman, Alana; Brown, Mark; Henthorn, Richard; Salamy, Karen; Walz, Peter; Peltzer, Edward T.; Brewer, Peter G. (2005-10-25)
      The field of ocean geochemistry has recently been expanded to include in situ laser Raman spectroscopic measurements in the deep ocean. While this technique has proved to be successful for transparent targets, such as ...
    • Development and evaluation of electromechanical cables for deep sea buoy applications 

      Bocconcelli, Alessandro (Woods Hole Oceanographic Institution, 1991-01)
      Electromechanical (E/M cables have been developed in order to satisfy the growing need for real time data telemetry from oceanographic moorings. Several E/M cable designs have been implemented with the cooperation of ...
    • Development and evolution of detachment faulting along 50 km of the Mid-Atlantic Ridge near 16.5°N 

      Smith, Deborah K.; Schouten, Hans A.; Dick, Henry J. B.; Cann, Johnson R.; Salters, Vincent J. M.; Marschall, Horst R.; Ji, Fuwu; Yoerger, Dana R.; Sanfilippo, Alessio; Parnell-Turner, Ross; Palmiotto, Camilla; Zheleznov, Alexei; Bai, Hailong; Junkin, Will; Urann, Ben; Dick, Spencer; Sulanowska, Margaret; Lemmond, Peter; Curry, Scott (John Wiley & Sons, 2014-12-05)
      A multifaceted study of the slow spreading Mid-Atlantic Ridge (MAR) at 16.5°N provides new insights into detachment faulting and its evolution through time. The survey included regional multibeam bathymetry mapping, ...
    • Development of an acoustic vorticity meter to measure shear in ocean-boundary layers 

      Thwaites, Fredrik T. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1995-09)
      This thesis describes the analysis and development of an acoustic vorticity meter to measure shear in ocean-boundary layers over smaller measurement volumes than previously possible. A nonintrusive measurement of vorticity ...
    • Development of an actively compliant underwater manipulator 

      DiPietro, David M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1988-05)
      This thesis describes the design, construction, and evaluation of an actively compliant underwater manipulator for installation on the underwater remotely operated vehicle (ROV) JASON. The goal of this work has been to ...