Now showing items 223-242 of 899

    • 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 ...
    • Development of large fish farm numerical modeling techniques with in situ mooring tension comparisons 

      Fredriksson, David W.; DeCew, Judson C.; Tsukrov, Igor; Swift, M. R.; Irish, James D. (2006-07-02)
      A study is conducted to validate a numerical model for calculating mooring system tensions of a large fish farm containing 20 net pens in the absence of waves. The model is forced using measured current velocity values ...
    • Development of the BASS rake acoustic current sensor : measuring velocity in the continental shelf wave bottom boundary layer 

      Morrison, Archie T. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1997-06)
      Surface swell over the continental shelf generates a sheet of oscillatory shear flow at the base of the water column, the continental shelf wave bottom boundary layer. The short periods of surface swell sharply limit the ...
    • Diapycnal diffusivities from a tracer release experiment in the deep sea, integrated over 13 years 

      Rye, Craig D.; Messias, Marie-Jose; Ledwell, James R.; Watson, Andrew J.; Brousseau, Andrew; King, Brian A. (American Geophysical Union, 2012-02-21)
      A section across the Atlantic at 24°S recorded in March 2009, sampled a tracer plume released in the deep Brazil Basin 13 years earlier. The 1-D diffusion equation was used to model the vertical spread of the tracer, ...
    • Diapycnal mixing in the Antarctic Circumpolar Current 

      Ledwell, James R.; St. Laurent, Louis C.; Girton, James B.; Toole, John M. (American Meteorological Society, 2011-01)
      The vertical dispersion of a tracer released on a density surface near 1500-m depth in the Antarctic Circumpolar Current west of Drake Passage indicates that the diapycnal diffusivity, averaged over 1 yr and over tens of ...
    • Diel changes in humpback whale Megaptera novaeangliae feeding behavior in response to sand lance Ammodytes spp. behavior and distribution 

      Friedlaender, Ari S.; Hazen, Elliott L.; Nowacek, Douglas P.; Halpin, Patrick N.; Ware, Colin; Weinrich, Mason T.; Hurst, Thomas P.; Wiley, David N. (Inter-Research, 2009-12-03)
      Humpback whales Megaptera novaeangliae have adopted unique feeding strategies to take advantage of behavioral changes in their prey. However, logistical constraints have largely limited ecological analyses of these ...
    • Differences between sound scattering by weakly scattering spheres and finite-length cylinders with applications to sound scattering by zooplankton 

      Stanton, Timothy K.; Wiebe, Peter H.; Chu, Dezhang (Acoustical Society of America, 1998-01)
      A modeling study was conducted to determine the conditions under which fluidlike zooplankton of the same volume but different shapes (spherical/cylindrical) have similar or dramatically different scattering properties. ...
    • A differential pressure instrument with wireless telemetry for in-situ measurement of fluid flow across sediment-water boundaries 

      Gardner, Alan T.; Karam, Hanan N.; Mulligan, Ann E.; Harvey, Charles F.; Hammar, Terence R.; Hemond, Harold F. (Molecular Diversity Preservation International, 2009-01-09)
      An instrument has been built to carry out continuous in-situ measurement of small differences in water pressure, conductivity and temperature, in natural surface water and groundwater systems. A low-cost data telemetry ...
    • Diffuse flow from hydrothermal vents 

      Trivett, D. Andrew (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1991-06)
      The effluent from a collection of diffuse hydrothennal vents was modelled to determine the fate of this source of flow under typical environmental conditions at seafloor spreading centers. A laboratory simulation was ...
    • Digital data logging and processing, Derbyshire Survey, 1997 

      Howland, Jonathan C. (Woods Hole Oceanographic Institution, 1999-07)
      In 1997, the Deep Submergence Group (DSG) of the Woods Hole Oceanographic Institution (WHOI) surveyed the wreckage field of the M.V. Derbyshire. The motivation for the survey and its results are described elsewhere ...
    • Direct estimate of lateral eddy diffusivity upstream of Drake Passage 

      Tulloch, Ross; Ferrari, Raffaele; Jahn, Oliver; Klocker, Andreas; LaCasce, Joseph H.; Ledwell, James R.; Marshall, John C.; Messias, Marie-Jose; Speer, Kevin G.; Watson, Andrew J. (American Meteorological Society, 2014-10)
      The first direct estimate of the rate at which geostrophic turbulence mixes tracers across the Antarctic Circumpolar Current is presented. The estimate is computed from the spreading of a tracer released upstream of Drake ...
    • Direct estimation of the Reynolds stress vertical structure in the nearshore 

      Feddersen, Falk; Williams, Albert J. (American Meteorological Society, 2007-01)
      Measurements of the vertical Reynolds stress components in the wave-dominated nearshore are required to diagnose momentum and turbulence dynamics. Removing wave bias from Reynolds stress estimates is critical to a successful ...
    • Direct numerical simulations of instability and boundary layer turbulence under a solitary wave 

      Ozdemir, Celalettin E.; Hsu, Tian-Jian; Balachandar, S. (Cambridge University Press, 2013-08-28)
      A significant amount of research effort has been made to understand the boundary layer instability and the generation and evolution of turbulence subject to periodic/oscillatory flows. However, little is known about bottom ...
    • Direct-form adaptive equalization for underwater acoustic communication 

      Yellepeddi, Atulya (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2012-06)
      Adaptive equalization is an important aspect of communication systems in various environments. It is particularly important in underwater acoustic communication systems, as the channel has a long delay spread and is ...
    • Directional wavenumber characteristics of short sea waves 

      Suoja, Nicole M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2000-02)
      Interest in short waves on the ocean surface has been growing over the last three decades because they play an important role in surface electromagnetic (e.m.) scattering. Currently radars and scatterometers which use ...
    • Discriminating between the nearfield and the farfield of acoustic transducers 

      Foote, Kenneth G. (Acoustical Society of America, 2014-10)
      Measurements of the performance of acoustic transducers, as well as ordinary measurements made with the same, may require discriminating between the farfield, where the field is spherically divergent, and the complementary ...