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  • Modulation Transfer Function of Sea Water

    Creator:
    Zaneveld, J. Ronald V. and Beardsley, George F., Jr.
    Abstract:
    The modulation transfer function (MTF) of a simple submarine viewing situation is computed as a function of range and sea-water properties. For the cases considered, we found that the MTF follows the simple exponential law, exp(-ω/ω₀), where ω is the spatial frequency in lines/deg and where ω₀ is a complicated...
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    , Introduction to Statistical Optics (Addison- Wesley Publ. Co., Inc., Reading, Mass., 1963). 4S. Chandrasekhar

  • Pseudoparabolic Partial Differential Equations

    Creator:
    Showalter, R. E. and Ting, T. W.
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    Article
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    the elements. The eth derivative of a function q in cm(f) is denoted by D=q) ax{’ax cx]" q)’ where

  • Well-Posed Problems for a Partial Differential Equation of Order 2m + 1

    Creator:
    Showalter, R. E.
    Abstract:
    We are concerned here with well-posed problems for the partial differential equation uₜ(x, t) + yMuₜ(x, t) + Lu(x, t) = f(x, t) containing the elliptic differential operator M of order 2m and the differential operator L of order ≤2m. Hilbert space methods are used to formulate and solve an...
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    D is a derivative of order [[ 1 -- -- n"* Received by the editors September 18, 1969." Department

  • Amino acid uptake by marine phytoplankters

    Creator:
    Wheeler, Patricia A., North, Barbara B., and Stephens, Grover C.
    Abstract:
    Axenic cultures of 25 species of unicellular marine algae were tested for their ability to utilize nine common amino acids, supplied at high concentrations in batch culture, as a nitrogen source; most species were able to use several amino acids, although growth was often slower than on nitrate nitrogen. The...
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    - sistance and help in manuscript preparation. D. Staley assisted in the uptake measurements. To study

  • Some aerodynamic features of a cotton canopy

    Creator:
    Bache, D.H. and Unsworth, Michael H.
    Abstract:
    Analysis of profiles measured over irrigated cotton in the Sudan Gezira showed that the crop boundary layer remained stable throughout most of the day. The shape of wind profiles measured within the canopy suggested that momentum was absorbed mostly in the upper layers of the canopy, with the lower regions...
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    cotton canopy By D. H. BACHE* and M. H. UNSWORTH Nottingham University, School of Agriculture

  • Uptake of glycine by natural phytoplankton communities

    Creator:
    Wheeler, Patricia A., North, B., Littler, M., and Stephens, G.
    Abstract:
    Uptake of [14C]glycine by various size fractions of natural plankton communities was measured to determine if phytoplankton can compete effectively with other members of the plankton community for the free amino acids in seawater. The simultaneous occurrence of glycine uptake, plant pigments, and photosynthetic activity in the same size fractions,...
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    times, ex- posed for 3-5 days, and developed with Kodax D-19 developer and rapid fixer. Species

  • Methylammonium uptake by Chesapeake Bay phytoplankton: Evaluation of the use of the ammonium analogue for field uptake measurements

    Creator:
    Wheeler, Patricia A. and McCarthy, James J.
    Abstract:
    The uptake of methylammonium (MA) by Chesapeake Bay phytoplankton was measured in short term experiments by using the 14C radioisotope. This uptake was inversely related to ambient NH4+ concentrations, and the specificity for uptake of both substrates was demonstrated by competitive inhibition. At stations with low ambient NH4+, MA uptake...
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    amino acids (Shaw et al. 1966), were not assayed. In laboratory studies with a variety of algae

  • Reconciling measured and predicted fluxes of oxygen across the deep sea sediment-water interface

    Creator:
    Reimers, Clare E. and Smith, K. L., Jr.
    Abstract:
    Rates of sediment community oxygen consumption determined in situ are compared to fluxes predicted from oxygen microelectrode gradients measured in cores from ~3,750-m water depth in the eastern North Pacific. Oxygen concentrations decrease exponentially over > 1.5 cm and suggest that organic matter in the sediments is degraded most rapidly...
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    account for nearly all the directly measured in situ flux, 0.2Ot-0.02 pmol cm-2 d-l. This differs from

  • A unified treatment of Wigner D functions, spin‐weighted spherical harmonics, and monopole harmonics

    Creator:
    Dray, Tevian
    Abstract:
    A unified, self‐contained treatment of Wigner D functions, spin‐weighted spherical harmonics, and monopole harmonics is given, both in coordinate‐free language and for a particular choice of coordinates.
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    , 1957). 4L. C. Biedenham and 1. D. Louck, Angular Momentum in Quantum Phys- ics (Addison-Wesley

  • Small-scale physics of the ocean

    Creator:
    Caldwell, Douglas R.
    Abstract:
    Four years ago, we noted that, although there was a widespread belief that the key to many ocean processes must be the communication of energy by internal waves, there had been little progress in definitely relating small‐scale processes to internal waves (Caldwell, 1983a). For example, although it seemed plausible that...
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    layers fingers in a Hele-Shaw cell (Taylor and Veronis, showed that, depending on the initial conditions