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  • Mathematical model of a phytoplankton community in a nitrate limited environment

    Creator:
    Grenney, William J.
    Abstract:
    Mathematical modeling of phytoplankton populations based on laboratory observations provides increased understanding of the interaction among the environmental and biological mechanisms. influencing growth dynamics. Such fundamental understanding is necessary to estimate the impact of man-made perturbations on natural population. A three-compartment mathematical model was developed to represent a phytoplankton population...
    Resource Type:
    Dissertation
    Full Text:
    : MATHEMATICAL MODEL OF A PHYTOPLANKTON COMMUNITY IN A NITRATE LIMJ)'ED ENVIRONMENT Redacted for privacy

  • A mathematical model for adsorptive bubble-separation processes

    Creator:
    T'ang, Li
    Abstract:
    Adsorptive bubble-separation processes are used to remove adsorptive contaminants from wastewater. A mathematical model was developed for the adsorptive bubble separation processes in a countercurrent column. The model included an assumption that linear adsorption of the solute occurred on the gas bubbles. Predictions indicated that aqueous column height has less...
    Resource Type:
    Dissertation
    Full Text:
    differentiation of surface tension with respect to concentration, it is not commonly used in mathematical models

  • Stochastic analysis of the nonlinear response transition behavior of an ocean system

    Creator:
    Yuk, Dongjun
    Abstract:
    The nonlinear response of an ocean system subjected to random excitations can exhibit very complex dynamic behaviors including jump phenomena and coexistence of attractors. In this study, the stochastic system response behavior of a simple (Duffing) oscillator under narrow-band random excitations is first examined in the subharmonic resonance region. A...
    Resource Type:
    Masters Thesis
    Full Text:
    Stochastic analysis of the nonlinear response transition

  • Field verification of a mathematical model for the physical fate prediction of dredged material instantaneously disposed at sea

    Creator:
    Hollings, William H.
    Abstract:
    Dredged spoil plumes are monitored during nine hopper dredge disposal events in 186 foot water depths offshore near Coos Bay, Oregon. Position and solids volume concentration characteristics of the plumes are established. Computer simulations of the monitored events are executed using the WES modified version of the Koh-Chang instantaneous disposal...
    Resource Type:
    Masters Thesis
    Full Text:
    Field Verification of a Mathematical Model for the

  • Numerical simulation of anaerobic reductive dechlorination of CAHs in continuous flow systems

    Creator:
    Mustafa, Nizar Ahmad
    Abstract:
    Halogenated organic compounds have had widespread and massive applications in industry, agriculture, and private households, for example, as degreasing solvents, flame retardants and in polymer production. They are released to the environment through both anthropogenic and natural sources. The most common chlorinated solvents present as contaminants include tetrachloroethene (PCE, perchloroethene)...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE THESIS OF Nizar Ahmad Mustafa

  • Modeling shallow-water hydrodynamics : rotations, rips, and rivers

    Creator:
    Long, Joseph W.
    Abstract:
    Hydrodynamic models are used as a diagnostic tool to understand the temporal variability of shallow-water processes that are difficult to completely resolve with traditional field measurements. For all simulations, modeled quantities are qualitatively or quantitatively compared with available measurements to gain confidence in conclusions derived from the modeled results. In...
    Resource Type:
    Dissertation
    Full Text:
    generation on an open coast, Journal of Geophysical Research, 80 (24). Dietrich, W. E. (1987), River

  • Coupled dynamics of bouys and mooring tethers

    Creator:
    Idris, Krisnaldi
    Abstract:
    Time-domain models were developed to predict the response of a tethered buoy subject to hydrodynamic loadings. A coupled analysis of the interaction of a buoy and its mooring is included and three-dimensional response is assumed. External loadings include hydrodynamic forces, tethers tensions, wind loadings and the weight of both cable...
    Resource Type:
    Dissertation
    Full Text:
    Coupled dynamics of bouys and mooring tethers AN ABSTRACT

  • Digital simulation of multi-dimensional random processes and its applications

    Creator:
    Ahn, Gil Soo
    Abstract:
    This dissertation introduces a method which can simulate multi-dimensional Gaussian random processes by the superposition of sine functions The fast Fourier transform technique is incorporated into the simulating method to facilitate saving of computer time. In view of the fact that the fast Fourier transform play important roles in digital...
    Resource Type:
    Dissertation
    Full Text:
    Digital simulation of multi-dimensional random processes

  • Dynamics of the nearshore wave bottom boundary layer

    Creator:
    Foster, Diane Lyn
    Abstract:
    This thesis presents an examination of the nearshore wave bottom boundary layer under conditions of significant sediment response. Using both field observations and simple models, the response of the bottom boundary layer to random waves is shown to have a complex behavior. First, the linearized wave bottom boundary layer governing...
    Resource Type:
    Dissertation
    Full Text:
    guidance on the mathematical solution, and Dr. Rob Holman, who provided advice on all chapters of this

  • Evaluation and application of ice segregation parameters for frost heave prediction

    Creator:
    Ito, Yuzuru, 1958-
    Abstract:
    The success of civil engineering construction in cold regions often depends on the assessment of the potential for frost heave. Over the past two decades two models have been presented to the engineering community to identify the frost heave potential, namely: (1) the segregation potential (SP), and (2) the discrete...
    Resource Type:
    Dissertation
    Full Text:
    Potential of a Freezing Soil," Canadian Geotechnical Journal, Vol. 18, 1981, pp. 482-491. 2. Nixon, J. F