The behavior of a stream upon entering a field reservoir was
studied at various stages of stratification. The principal field techniques
included fluorometric and temperature surveys. General
relationships were obtained, between dimensional and locational characteristics
of the inflow current and the thermal structure of the
impoundment. As predicted by analytical...
This report presents the findings of a sediment analysis
program formulated to determine the flushing potential
of various shaped small boat marina basins. Chemical tests
regarding volatile solids, Kjeldahl nitrogen, grease and
oil, and sulfides were performed with the results compared
to established sediment quality criteria. These results
were used...
Side-scan sonar records in Oregon's Coos Bay estuary navigation
channels were obtained at intervals of two to three months during the
November 1974 - October 1975 time period from Coos Bay Channel Mile
11+50 to 15+20, and from a reach in the Marshfield Channel. A limited
side-scan survey effort was...
The purpose of this study was to ascertain the potential erosion
impacts associated with ship movements in confined waters. The flow
associated with a ship passage can be separated accordingly: (1) the
propeller wake, (2) flow about the hull, and (3) associated waves.
Each of these areas has been analyzed...
Withdrawal from a two-layer flow field is examined in terms of
the degree of selectivity of the withdrawal flow and its dependence
on an ambient current. Selectivity is defined as the bias of withdrawing
one layer more strongly than the other; the extreme' case is
complete selective withdrawal, where one...
The effect of entering streamflow on currents of a density
stratified reservoir has been studied in a laboratory model to
provide insight into the prediction, control, and maintenance of
quality water discharge from a thermally stratified reservoir.
Twenty experiments were performed using various concentrations
of a sodium chloride solution to...
The purpose of this investigation is to study the effect of the
solid transport capacity in pumping operation: A special type of
jet apparatus was investigated which emits a water jet downward
counter current to delivery flow, from inside of the suction pipe toward
sediment to be excavated. Two sizes...
Seasonal data on tides, water quality and sediments in the
Siuslaw Estuary were collected. Tide and velocity data were analyzed
to evaluate damping conditions in the estuary. The system was found
to approximate a weakly damped standing wave. A strong relationship
of damping conditions to river flow was observed. The...
This study was undertaken to provide information needed in the design of ocean outfalls. A review of past investigations concerning forces on submerged objects is presented. Objects independent of any boundary and cylinders in boundary contact are considered. A solution for pressure distribution about a circular cylinder resting on a...
A laboratory investigation was undertaken to evaluate the effect
of lateral spacing and lateral diameter on the flow characteristics of
a three dimensional blowing manifold.
The model used in the experimental work was constructed of
clear cast acrylic pipe, five inches in diameter. Laterals of two and
four inch diameter,...
The effects of boundary geometry on internal density currents
in a density stratified reservoir were investigated in a laboratory
model. When water was simultaneously withdrawn and admitted to
the reservoir, a complex current regime was established. The general
flow pattern is described, and the influence of physical variables
on the...
The overriding goal of this study was to provide first order estimates of dilution and tidal flushing of waste discharges released hypothetically into various Oregon estuaries during critical low flows and tides. Causal relationships between discharged wastes and subsequent estuarine response were studied. Various approaches to determine the assimilative capacity...
The Siletz Estuary was studied in 1973 to determine seasonal
variations in tidal dynamics, water quality, and sediments.
Tidal ranges and times were measured and compared to predicted
values at two positions within the bay. Tidal ranges and times
were analyzed to determine the dampening and phasing conditions
within the...
The purpose of this study was to provide an understanding of the
interrelationships between fresh and salt water Circulation, tidal transport
and flushing patterns in the Chetco River estuary and its boat
basins.
Field work and water quality measurements were conducted at the
entrance of the Chetco River during 1975...
An interesting means of shoal removal has recently been implemented by the U.S. Army Corps of Engineers for use in shallow Pacific
Coast tidal inlets and estuaries. In the past, removal of shoaled material has consisted of physical excavation of material, transportation from the site, and placement in a spoils...
The system of partial differential equations which governs the
motion of a Newtonian fluid has been known for over a century. Yet,
due to the complexity of the equations, an analytical solution is known
only for a few simple geometries or a few special cases such as very
slow motion....
The mathematical technique of overrelaxation is used here to speed the convergence of a numerical method for solving viscous, incompressible fluid flow problems. The method, called MAC, involves approximating the complete two-dimensional incompressible Navier-Stokes equations with analogous finite-difference equations. The MAC method was developed by the Los Alamos Scientific Laboratory...
The objective of this paper is to seek the general solution of the
complete Navier-Stokes equations governing heterogeneous, time-dependent, incompressible, viscous, laminar fluid dynamics through
digital simulation. In particular, two-layered stratified flows are
treated by using a numerical algorithm called the Marker-and-Cell
extended method (MACE), which is an extension of...
Adequate lubrication is of the utmost importance in internal combustion engines. Low temperature operation with low-proof alcohol may create some operational problems if alcohol and or water accumulates in the crankcase oil. Condensates of unburned alcohol and water may be blown into the crankcase oil with blow by gases. The...
A complete solution, exact to second-order, for wave motion
forced by a hinged-wavemaker of variable-draft is presented. A
solution for a piston type wavemaker is also obtained as a special
case of a hinged-wavemaker with negative infinite draft. The
existing Stokes inviscid theories for mass transport is extended to
include...
Short non-flexible elements of cable were driven harmonically
in water while constrained by springs. The cable elements were observed
to oscillate at approximately the Strouhal vortex shedding
frequency. Damped resonance occurred near the point where the natural
frequency and the Strouhal vertex shedding frequency were equal.
Transverse oscillation amplitudes greater...
The purpose of this study, to examine the relevance of U.S.
graduate education in agriculture to careers in agricultural
development of East African agriculturalists, was examined in
terms of three problems:
Problem 1: Was U.S. graduate education in agriculture
relevant to careers in agricultural development of East
African agriculturalists?
Problem...
This study explored how students navigate the technological landscape of a public, land-grant institution. Through online surveys and semi-structured, one-on-one interviews, the study operated through an anticipatory/participatory lens to research with the intent of understanding students' experiences with technology at a research institution. Using this methodology and Triandis and Triandis'...
Primate populations are declining in number, with an estimated “60% of primate species threatened with extinction from hunting and trapping” (Estrada et al., 2017). The largest threat to mammals in West and Central Africa is commercial hunting (Jost Robinson, Daspit, & Remis, 2011). Hunting these large mammals was once practiced...
There is an increasing body of evidence that the pineal gland acts
as a neuroendocrine transducer, translating neural information about
environmental lighting condition into hormonal information. In the
rat, light controls the production of melatonin which acts via the
hypothalamic-hypophyseal pathway to control the function of the gonads,
A similar...
This thesis presents an introduction to Marketing Research concepts,
relates Operations Research to Marketing Research and discusses
the limitations of each. An Information Theory approach based
on Shannon's fundamental theorems and extended by Kunisawa is
applied to one-factor and two-factor marketing problems.
The objective of one-factor information channel models is...
This dissertation treats information theory and its applications
to the general area of decision making. Specifically, three areas are
covered; (1) information theory applied to Bayesian analysis,
(2) estimation using multi-factor information channel models, and
(3) information theory applied to Markov chain analysis.
A major portion of this dissertation concerns...
During exploration of imaging photosynthetic fluorimetry of Arabidopsis thaliana mutants, we discovered a novel phenomenon wherein photosynthetic efficiency (defined in Ning et al., 1995) is shown to plot in discrete groups. This exploration resulted first in the development of a spectrofluorometric method that apparently allows for in vivo observation of...
Imaging spectra of plant tissues yield considerable potential and useful information
for basic studies and agriculture practice. We constructed an imaging spectrophotometer
with spectral range from 400 nm to 1100 nm, which was used to study various
physiological events of plant germplasm: location of bundle sheath and mesophyll cells in...
Paclitaxel is a very important anticancer drug commonly called Taxol®.
We know from previous work (Hoffman, et al., 1998) that Taxol exists in filbert, Corylus avellana L. material. Quantification of Taxol in filbert plant material is painstaking and hitherto was accomplished by rapidly processing single batches in a complicated procedure...
Food hubs are a key solution to advance local and regional food systems by providing aggregation, storage, and distribution services to small and mid-sized farmers and thereby help them to access local and regional markets. By performing these functions, food hubs produce valuable services to not only farmers but to...
A statistical analysis technique for estimating bit-error rate (BER) and eye
opening is presented for both NRZ and duobinary signaling schemes. This method
enables fast and accurate BER distribution simulation of a serial link transceiver
including channel and circuit imperfections, such as finite pulse rise/fall time, duty cycle
variation, and...
During his lifetime C. S. Lewis chose to speak to Christians in plain and simple language that they could understand. Lewis taught and defended truths that he felt were discernible through reason. Morality, free will, and the divinity of Jesus Christ were fundamental to his core beliefs and teachings. His...
International students are a growing population at many institutions of higher education in the United States, and they face unique challenges in navigating both higher education and the United States as a whole. Though there is significant research about international students, few studies have examined how international students perceive student...
Oregon sweet corn growers face high fertilizer, fuel
and weed control costs; soil compaction, erosion, organic
matter and nutrient depletion; and difficult equipment
operations in muddy fields. An alternative production
system might ease some of these problems.
Testing was begun to evaluate a living-mulch
cropping system for sweet corn (Zea...
While it can be said that peer mentor-mentee relationships in college can lead to meaningful connections and interpersonal support, there is a lack of literature about how exactly mentor-relationship connections are made. This study examines the relationship building strategies that peer mentors used to connect with their mentees in the...
This study aimed to investigate students' models of probability in a modern physics context. The study was divided into three phases. The first phase explored student pre-knowledge about probability before modem physics instruction. The second phase investigated student understanding of concepts related to probability such as wave-particle behavior, the uncertainty...
Because of the fuel crisis and problems associated with thermal
pollution there is new impetus and urgency for developing more
efficient energy conversion systems for power generation. A preliminary
analysis was undertaken to determine the potential of staged
Rankine cycle systems for substantially higher efficiency. It was
necessary to optimize...