The present work is a study of three degenerate, linear parabolic
systems of equations, each of which represents a version of the so-called
double porosity model for underground fluid flows in natural fractured
rock. These systems of equations together with initial and boundary
conditions describe single-phase flows in fluids, slightly...
An experimental investigation of the thermohaline, diffusive interface between convecting layers, with heat fluxes more similar to natural fluxes than in previous studies, shows that the formula suggested by Huppert (1971) for the dependence of heat flux on interface stability cannot be extrapolated to stability numbers higher than seven and...
The electrical conductivity of the pyromagmas from the Northeast
Crater of Mount Etna, Sicily was measured over the temperature
range 1032°C to 1071°C and over the frequency range 1 kHz to
400 kHz. Measurements were made using a four-terminal Wenner
array in conjunction with a Wavetek Model 110B portable signal...
A brief tilt and strain survey was conducted in the Krafla-Namafjall area in the North of Iceland during August of 1979 in order
to study the feasibility of applying solid earth tidal observations
in the exploration of volcanic geothermal systems. The rationale
of the survey was based on the expectation...
The problem of downward continuation of potential fields is
being considered. The basic approach involves computation in real
space using a power series expansion. The computation of the derivatives
required for evaluating the series is carried out on the basis of
two approximation methods, viz. (1) polynomial method, and
(2)...
The effects on the temperature microstructure of terrestrial heat flow and heat flow anomalies at the ocean floor are discussed on the basis of a simple heat diffusion model. The effects on the temperature microstructure of layering of the thermal properties of the ocean are investigated. This is done both...
The paper concerns itself with the problem of heat transport
in a homogeneous, incompressible, isotropic, semi-infinite solid
whose boundary is nonstationary. The methods of solution in the one
dimensional case are discussed. Numerical examples and a method
for arriving at the solutions published by Bailey and Lakin in their
paper...
The stability of fluids in porous media subject to
various physical and geometrical conditions is studied
here. Criteria for the onset of convective motions are
given in terms of critical temperature gradients or heat
sources. The general method used involves the linearization
of the field equations about the hydrostatic solutions...
The displacement of the free liquid surface in geothermal and
hydrologic reservoirs is an important capacitance factor. An
iterative approach to determining the drawdown of the free liquid
surface for a single sink region in a homogeneous, isotropic, Darcy-type
porous mediums is discussed. The iterative approach involves a
stepwise adjustment...
In this thesis, the interpretation and reduction of ocean heat
flow measurements are discussed on the basis of theoretical models.
The instrument effect x heat flow measurements is investigated for the
case of long period measurements by studying the heat conduction
along the measurement probe for both steady and unsteady...
Low-temperature hydrothermal activity in Iceland is
apparently mostly controlled by dikes and fractures.
Conventional methods of production data analysis are not
readily applicable in cases of heterogeneous/anisotropic
fracture dominated hydrothermal systems. Moreover, the
dikes and fractures may control the heat uptake mechanism
of low-temperature activity.
The free-surface response functions of...
This thesis involves the interpretation of gravity and other
potential field anomalies caused by layers of varying thickness. The
partial differential equations of potential field theory are reviewed for
gravitational and magnetic force fields. A similar review is carried
out for steady-state heat transport and diffusion processes. For the
gravitational...
Geothermal resources are characterized by a very low electrical
resistivity of the reservoir formations. The application of electrical
methods in the reconnaissance type exploration for such resources is
discussed. It is concluded that the magneto-telluric method is very
well suited for this purpose.
In 1971 and 1972 a reconnaissance type...
Two thermal convection problems of geophysical interest are
examined, theoretically. First, convection in the earth's mantle is
treated on the basis of a one-dimensional 'strip model'. This model
results from further simplification of the well known 'Rayleigh model'.
For homogeneous, Newtonian fluids, the strip model yields results
similar to those...
The perturbation method is applied to solve two numerical
problems in the earth sciences, viz., (l)the computation of deep sea
currents in the coastal region of the northeast Pacific and (2) the
interpretation of D.C. conduction data in exploration geophysics.
The perturbation method is largely equivalent to the method of...
The continuation of conductive temperature fields is being
considered. The continuation of a field involves the extrapolation of a
field known over a limited domain to an adjacent domain in such a way
that it satisfies the heat conduction differential equation and other
imposed constraints. Continuations forward in time and...
The numerical analysis of thermal convection in porous media,
heated from below, and assuming Darcy flow conditions, involves the
solving of a set of non-linear equations for the temperature and flow
fields. The condition of criticality determining the onset of convection
is obtained by linearization and the solving of an...
Anomaly timescales for the last 90 million years, derived from
marine magnetic profiles and published prior to mid-1979, are summarized,
illustrated for comparison, and critically reviewed. A revised timescale
is constructed using calibration points which fix the ages of anomalies
2.3', 5.5, 24, and 29. An equation is presented for...
A general theory of micromorphic materials was developed by
Eringen for the prediction of continuum behavior of materials with
inner structure, such as, granular solids, composite materials,
anisotropic and polymeric fluids. Recently Eringen derived balance
laws of micromorphic mechanics from a different point of view. His
derivation of the master...
Fish farming has grown very rabidly during the past few decades. One component of this expansion is the introduction of new species, previously unknown to most consumers, to world markets. Arctic char, a cold water salmonid, is one of these species. In 1987, the total commercial supply only amounted to...
The thermal regime of a postulated descending lithospheric slab
is calculated. The gravity anomaly associated with such a structure
is large in amplitude and long in wavelengh. Observed free-air
gravity anomalies in the Pacific Northwest do not indicate a gravitational
effect due to a descending slab.
Two hypothetical compensation models...
Genome instability is a prerequisite for the development of cancer. It occurs when genome maintenance systems fail to safeguard the genome’s integrity, whether as a consequence of inherited defects or induced via exposure to environmental agents (chemicals, biological agents and radiation). Thus, genome instability can be defined as an enhanced...
The stoichiometric model of organic decomposition in seawater
(Redfield, Ketchum, and Richards, 1963) was used to describe the
oceanic distribution of total carbon dioxide. It was assumed that the
concentration of total carbon dioxide was the sum of three terms:
(1) the initial concentration of carbon dioxide, (2) the increase...
Transition phenomena commonly occur in nature. These arise
either due to structural or behavioral changes in the medium. Examples
for these abound in all applied sciences and to mention a few
of these, we have, boundary layer, elastic-plastic deformation, and
shocks. The present work is devoted to the study of...
Lifestyle factors are responsible for a considerable portion of cancer incidence worldwide, but credible estimates from the World Health Organization and the International Agency for Research on Cancer (IARC) suggest that the fraction of cancers attributable to toxic environmental exposures is between 7% and 19%. To explore the hypothesis that...
Oregon's nursery and greenhouse industry has ranked the first in the State's agricultural for 18 years. The majority of nursery sales from the Pacific Northwest come from Oregon. Due to data limitations, empirical study of the Oregon nursery industry is rare. The present dissertation consists of three essays that analyze...
Downy mildew (caused by Pseudoperonospora humuli) causes significant losses in hop (Humulus lupulus L.) cone yield and quality, and potential crown death. Breeding for resistance has proved difficult presumably because of the highly quantitative nature of genetic control over expression. The objective of this study was to utilize multiple environments...
This compilation lists in chronological order the oceanographic reports published in 1974 and 1975. It is the second annual update of our reference 74-1 which brought together a listing of all the numbered series issued, 1955-1973. Reference 75-1 listed 1972-1973 and 1974 reports. It also lists theses for which degrees...
Holocene hemipelagic deposition of terrigenous silts and clays
dominates sedimentation on most of the Oregon and Washington continental
slope. The sources of these sediments, the mechanisms causing sediment
dispersal, and the relative contributions of the various continental
sources to the marine deposits have been investigated using quantitative
mineral and geochemical...
Third order spectra computed from the rotary components of
winds and currents at the TOTEM buoy site off the Oregon coast provide
an insight to the nonlinear, quadratic interactions within and between
these vector fields. The topography of bispectra and cross-bispectra
as displayed on four tri-frequency planes shows that significant...
I examined hydrological and plant community changes associated with the implementation of a restoration management plan in two riparian meadows located within an agricultural landscape of the central Willamette Valley, Oregon. I established exclosure fencing (a form of passive restoration) in one agricultural field and established fencing and plugged a...
First-order analyses of wind and current time series obtained from a Totem buoy off the Oregon coast during 1970 are presented. In addition, winds at Totem are compared with winds recorded simultaneously at Newport, Oregon.
The specific activity of ⁶⁵Zn (nanocuries ⁶⁵Zn/g total Zn)
was determined in various organs of the common coastal mussel,
Mytilus californianus Conrad, collected from six locations along
the Pacific Coast. These organs included the gills, mantle, foot,
reproductive organs, adductor muscle, and viscera. After ashing
and dissolving with nitric acid...
In 1955 one oceanography report was issued by Oregon State University. The School of Oceanography now issues between 35 and 50 reports per year. This compilation lists in chronological order all oceanographic reports published through 1973. It also lists theses for which degrees were awarded between 1962 and 1973. Both...