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Articles 1 - 6 of 6
Full-Text Articles in Engineering
Water Wave Refraction With Non-Linear Theory, Im Sang Oh
Water Wave Refraction With Non-Linear Theory, Im Sang Oh
OES Theses and Dissertations
Two different kinds of wave refraction models are formulated in the present study using Stokes' third order wave theory. One type of model is utilized in a parametric study employing several different topographies. Wave trajectories obtained from this model, when obtained by using first and third order wave theory with and without the consideration of energy dissipation, show considerable differences. These differences are examined in more detail for a bottom of constant slope: (1) An approximate 10% difference occurs between the refraction coefficients obtained using the first and the third order wave theory. (2) Considerably different ray trajectories are detected …
Mining The Deep Seabed Implications For International Law And American Foreign Policy, Steven H. Fitzgerald
Mining The Deep Seabed Implications For International Law And American Foreign Policy, Steven H. Fitzgerald
Graduate Program in International Studies Theses & Dissertations
Whether or not the United States may someday face a mineral shortage, the need for a coherent, unified minerals policy is critical to national objectives and national security. Deep-sea mining may be the answer to American (and world) mineral needs in the twenty-first century. However, there are numerous problems which must be dealt with and resolved in the near future, in order to enable the U.S. (and the world community) to take advantage of vast undersea resources. Deep-sea mining requires the development of technology, tremendous capital investments, and years of labor before production can begin. U.S. policy makers must decide …
Effects Of Multiple Scattering And Surface Albedo On The Photochemistry Of The Troposphere, Tommy Reinhold Robert Augustsson
Effects Of Multiple Scattering And Surface Albedo On The Photochemistry Of The Troposphere, Tommy Reinhold Robert Augustsson
Mechanical & Aerospace Engineering Theses & Dissertations
A one-dimensional photochemical model of the troposphere containing the species of the nitrogen, oxygen, carbon, hydrogen, and sulfur families has been developed and used to investigate the vertical profiles and the natural (including atmospheric chemical reactions) and anthropogenic sources and sinks of these species. The species continuity equations are solved numerically applying prescribed boundary conditions. The vertical flux is simulated by use of the parameterized eddy diffusion coefficients. Heterogeneous losses (e.g. rainout, gas-to-particle chemistry, and dry deposition), are parameterized to make calculated profiles consistent with measurements. The photochemical model is coupled to a radiative transfer model that calculates the radiation …
Usage And Limitations Of Characteristic Vector Analysis Of Remote Sensing Multispectral Data For The Identification And Quantification Of Water Quality Parameters, Theodore A. Talay
Usage And Limitations Of Characteristic Vector Analysis Of Remote Sensing Multispectral Data For The Identification And Quantification Of Water Quality Parameters, Theodore A. Talay
Civil & Environmental Engineering Theses & Dissertations
Recent applications of the technique of characteristic vector analysis to remote-sensing water color data has met with varying degrees of success. It is apparent from these experiments that a more thorough understanding of the informational capability of characteristic vector analysis is needed.
A Method Of Modeling Multirate Two-Dimensional Recursive Digital Filters Author, Albert P. Gerheim
A Method Of Modeling Multirate Two-Dimensional Recursive Digital Filters Author, Albert P. Gerheim
Electrical & Computer Engineering Theses & Dissertations
This dissertation presents a method of modeling two dimensional sampled data systems with two sampling rates in each dimension. This methodology is applied to the problem of synthesizing two dimensional velocity filters using one dimensional prototypes and multirate concepts.
The modeling method includes the replacement of scalar z-transforms of signals by vectors of polynomials, and the replacement of scalar z-transforms of impulse responses by matrices of polynomials.
The synthesis of velocity filters is accomplished through the use of coordinate transformations in the z-transform domain which skew the ω1 -ω2 axes on the unit bidisc. The filters synthesized using …
Sound Absorption In N2-H2o Gas Mixtures At Room Temperature And Low Frequency/Pressure Ratios, William Axam Griffin
Sound Absorption In N2-H2o Gas Mixtures At Room Temperature And Low Frequency/Pressure Ratios, William Axam Griffin
Mechanical & Aerospace Engineering Theses & Dissertations
This study was motivated by a need to obtain standard values of nitrogen's contribution to sound absorption in the Earth's atmosphere. Specific goals included accurate measurements of sound absorption in nitrogen - water vapor mixtures at room temperature and low frequency/pressure ratios, the determination of the N2 vibrational relaxation peak location, (f/P)max, on the f/P axis as a function of humidity, h, and critical evaluation of all results.
The free decay technique was used in a resonance tube to obtain ten sets of sound absorption data in N2-H2O gas mixtures and requisite companion …