Now showing items 1961-1980 of 7061

  • Effects of watershed land use on nitrogen concentrations and δ15 Nitrogen in groundwater 

    Cole, Marci L.; Kroeger, Kevin D.; McClelland, James W.; Valiela, Ivan (2005-07-18)
    Eutrophication is a major agent of change affecting freshwater, estuarine, and marine systems. It is largely driven by transportation of nitrogen from natural and anthropogenic sources. Research is needed to quantify ...
  • Effects of wave rollers and bottom stress on wave setup 

    Apotsos, Alex; Raubenheimer, Britt; Elgar, Steve; Guza, R. T.; Smith, Jerry A. (American Geophysical Union, 2007-02-03)
    Setup, the increase in the mean water level associated with breaking waves, observed between the shoreline and about 6-m water depth on an ocean beach is predicted well by a model that includes the effects of wave rollers ...
  • Effects of wave shape on sheet flow sediment transport 

    Hsu, Tian-Jian; Hanes, Daniel M. (American Geophysical Union, 2004-05-25)
    A two-phase model is implemented to study the effects of wave shape on the transport of coarse-grained sediment in the sheet flow regime. The model is based on balance equations for the average mass, momentum, and fluctuation ...
  • Efficient control based on a verified model for an autonomous underwater vehicle : a case study of Autonomous Benthic Explorer 

    Anderson, Jamie M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1992-02)
    The Autonomous Benthic Explorer (ABE) is an unmanned underwater vehicle being developed for scientific study of the deep ocean sea:floor. ABE will be completely autonomous from the surface which means that the lifetime ...
  • Efficient organic carbon burial in the Bengal fan sustained by the Himalayan erosional system 

    Galy, Valier; France-Lanord, Christian; Beyssac, Olivier; Faure, Pierre; Kudrass, Hermann; Palhol, Fabien (2007-10-04)
    Continental erosion controls atmospheric carbon dioxide levels on geological timescales through silicate weathering, riverine transport and subsequent burial of organic carbon in oceanic sediments. The efficiency of ...
  • Efficient representation of the hydrographic structure of the north Atlantic Ocean and aspects of the circulation from objective methods 

    Fukumori, Ichiro (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1989-03)
    The general theme of this thesis is the study of systematic mathematical techniques for determining the ocean circulation from classical hydrographic data. Two aspects of this theme are analyzed. The first is finding an ...
  • Effusive and explosive volcanism on the ultraslow-spreading Gakkel Ridge, 85°E 

    Pontbriand, Claire W.; Soule, Samuel A.; Sohn, Robert A.; Humphris, Susan E.; Kunz, Clayton G.; Singh, Hanumant; Nakamura, Ko-ichi; Jakobsson, Martin; Shank, Timothy M. (American Geophysical Union, 2012-10-06)
    We use high-definition seafloor digital imagery and multibeam bathymetric data acquired during the 2007 Arctic Gakkel Vents Expedition (AGAVE) to evaluate the volcanic characteristics of the 85°E segment of the ultraslow ...
  • EGenBio : a data management system for evolutionary genomics and biodiversity 

    Nahum, Laila A.; Reynolds, Matthew T.; Wang, Zhengyuan O.; Faith, Jeremiah J.; Jonna, Rahul; Jiang, Zhi J.; Meyer, Thomas J.; Pollock, David D. (BioMed Central, 2006-09-26)
    EGenBio is a system for manipulation and filtering of large numbers of sequences, integrating curated sequence alignments and phylogenetic trees, managing evolutionary analyses, and visualizing their output. EGenBio is ...
  • eJDS - a free e-journal delivery service via e-mail. 

    Canessa, E.; Fonda, C.; Cerdeira, Hilda A. (IAMSLIC, 2003)
  • Ekman veering, internal waves, and turbulence observed under Arctic sea ice 

    Cole, Sylvia T.; Timmermans, Mary-Louise; Toole, John M.; Krishfield, Richard A.; Thwaites, Fredrik T. (American Meteorological Society, 2014-05)
    The ice–ocean system is investigated on inertial to monthly time scales using winter 2009–10 observations from the first ice-tethered profiler (ITP) equipped with a velocity sensor (ITP-V). Fluctuations in surface winds, ...
  • Elastic wave speeds and moduli in polycrystalline ice Ih, sI methane hydrate, and sII methane-ethane hydrate 

    Helgerud, M. B.; Waite, William F.; Kirby, S. H.; Nur, A. (American Geophysical Union, 2009-02-27)
    We used ultrasonic pulse transmission to measure compressional, P, and shear, S, wave speeds in laboratory-formed polycrystalline ice Ih, sI methane hydrate, and sII methane-ethane hydrate. From the wave speed's linear ...
  • The electrical field induced by ocean currents and waves, with applications to the method of towed electrodes 

    Longuet-Higgins, M. S.; Stern, Melvin E.; Stommel, Henry M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1954-11)
    The purpose of this paper is to discuss the nature of the electrical field induced in the ocean by particular types of velocity distribution. It is believed that these examples will be helpful in the interpretation of ...
  • Electrical lithosphere beneath the Kaapvaal craton, southern Africa 

    Evans, Rob L.; Jones, Alan G.; Garcia, Xavier; Muller, Mark R.; Hamilton, Mark P.; Evans, Shane; Fourie, C. J. S.; Spratt, Jessica; Webb, Susan J.; Jelsma, Hielke; Hutchins, David (American Geophysical Union, 2011-04-20)
    A regional-scale magnetotelluric (MT) experiment across the southern African Kaapvaal craton and surrounding terranes, called the Southern African Magnetotelluric Experiment (SAMTEX), has revealed complex structure in the ...
  • Electrical structure beneath the northern MELT line on the East Pacific Rise at 15°45′S 

    Baba, Kiyoshi; Tarits, Pascal; Chave, Alan D.; Evans, Rob L.; Hirth, Greg; Mackie, Randall L. (American Geophysical Union, 2006-11-16)
    The electrical structure of the upper mantle beneath the East Pacific Rise (EPR) at 15°45′S is imaged by inverting seafloor magnetotelluric data obtained during the Mantle ELectromagnetic and Tomography (MELT) experiment. ...
  • The electrical structure of the central Pacific upper mantle constrained by the NoMelt experiment 

    Sarafian, Emily; Evans, Rob. L.; Collins, John A.; Elsenbeck, James R.; Gaetani, Glenn A.; Gaherty, James B.; Hirth, Greg; Lizarralde, Daniel (John Wiley & Sons, 2015-04-18)
    The NoMelt experiment imaged the mantle beneath 70 Ma Pacific seafloor with the aim of understanding the transition from the lithosphere to the underlying convecting asthenosphere. Seafloor magnetotelluric data from four ...
  • Electrokinetic measurements of membrane capacitance and conductance for pancreatic β-cells 

    Pethig, Ronald; Jakubek, L. M.; Sanger, R. H.; Heart, E.; Corson, Erica D.; Smith, Peter J. S. (2005-10-31)
    Membrane capacitance and membrane conductance values are reported for insulin secreting cells (primary β-cells and INS-1 insulinoma cells) determined using the methods of dielectrophoresis and electrorotation. The membrane ...
  • Electromagnetic constraints on a melt region beneath the central Mariana back-arc spreading ridge 

    Matsuno, Tetsuo; Evans, Rob L.; Seama, Nobukazu; Chave, Alan D. (American Geophysical Union, 2012-10-25)
    An electrical resistivity profile across the central Mariana subduction system shows high resistivity in the upper mantle beneath the back-arc spreading ridge where melt might be expected to exist. Although seismic data ...
  • Electromagnetic flow sensors 

    Lawson, Kenneth; Kanwisher, John W. (Woods Hole Oceanographic Institution, 1974-03)
    Flow sensors based on the principle of electromagnetic induction were investigated as alternatives to commonly used mechanical devices utilizing rotors and propellers. Prototype sensors were constructed showing ...
  • Electromagnetic image of the Trans-Hudson orogen — THO94 transect 

    Garcia, Xavier; Jones, Alan G. (National Research Council Canada, 2005-06-01)
    The North American Central Plains (NACP) anomaly in enhanced electric conductivity and its relationship with the Paleoproterozoic Trans-Hudson orogen (THO) has been studied under the auspices of Lithoprobe for over a decade. ...
  • An electromagnetic method for measuring the velocities of ocean currents from a ship under way 

    Von Arx, William S. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1950-03)
    During the past four years a deliberate effort has been made at the Woods Hole Oceanographic Institution to devise methods of kinematic observation generally suited to the needs of oceanographers. One result of this work, ...