Soil organic matter (SOM) is the result of the balance between decomposition and incorporation of detritus from both above and below ground sources into the soil. It composes only a fraction of the soil by mass but it is one of the most critical components. The Detritus Input and Removal...
We investigate the optimal harvesting strategies for McKendrick type population models. Models of this type endow the population with a continuous age structure. They consist of a partial differential equation with a boundary condition which involves an integral of the solution. We study two problems, the first concerns the yield...
Plagiobothrys hirtus is Oregon’s top priority for endangered plant species recovery, and the wetlands of Douglas County provide the only habitat for this plant in the world. The goal is to downlist this species from endangered to threatened, and in order to do that, existing populations must be protected, and...
Full Text:
Study Objectives:
I. To collect seed from a series of
We are at risk of losing the sagebrush steppe in the floristic Great Basin to the invasion of Bromus tectorum L., cheatgrass. The floristic Great Basin includes the Central Basin and Range, the Northern Basin and Range, and the Snake River Plain. The Great Basin receives most of its precipitation...
Atomic Layer Deposition (ALD) is a promising technique for the production of
biologically safe, wear resistant and corrosion protective coatings for orthopedic
applications. In this work, the impact of coating thickness and surface preparation on the
hardness (H), elastic modulus (E), wear resistance, and delamination of ALD Al2O3 films
is...
Full Text:
ABSTRACT OF THE THESIS OF
Nicole Lea Bauer for the degree of Honors Baccalaureate of Science in
Atomic Layer Deposition (ALD) is a promising technique for the production of
biologically safe, wear resistant and corrosion protective coatings for orthopedic
applications. In this work, the impact of coating thickness and surface preparation on the
hardness (H), elastic modulus (E), wear resistance, and delamination of ALD Al2O3 films
is...
Full Text:
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Atomic Layer Deposition (ALD) is a promising technique for the production of
biologically safe, wear resistant and corrosion protective coatings for orthopedic
applications. In this work, the impact of coating thickness and surface preparation on the
hardness (H), elastic modulus (E), wear resistance, and delamination of ALD Al2O3 films
is...
Gazing behavior is a vital part of nonverbal communication, as it can provide information about attentional state, subtext, environment, and point of view. Both dogs and cats have previously been shown to display gazing behavior when presented with an unsolvable task, as well as follow nonverbal directional ques given by...
The purpose of this watershed assessment is to provide an inventory and characterization of
watershed conditions in the Wilson River watershed and to provide recommendations that
address the issues of water quality, fisheries and fish habitat, and watershed hydrology.
Plagiobothrys hirtus is Oregon’s top priority for endangered plant species recovery, and the wetlands of Douglas County provide the only habitat for this plant in the world. The goal is to downlist this species from endangered to threatened, and in order to do that, existing populations must be protected, and...
Full Text:
Slide 1
Study Objectives:
I. To collect seed from a series
Shrubs, bunchgrasses and biological soil crusts (biocrusts) are believed to contribute to site resistance to plant invasions in the presence of cattle grazing. Although fire is a concomitant disturbance with grazing, little is known regarding their combined impacts on invasion resistance. We are the first to date to test the...
Fisheries management that is based on quantitative assessment has commonly relied on estimating the unfished biomass of a fished stock to compare current and historical population size. Developing predictive models for this requires many years of catch and abundance data. Smaller, new, or mainly recreational fisheries may not have the...
Nest counts from the largest subpopulation of the loggerhead sea turtle (Caretta caretta) in the Atlantic, peninsular Florida, have been declining since 1998. Analyzing trends of nests and adult females is insufficient to determine the overall status of a sea turtle population, due to variation in nesting frequency and a...
Effects of habitat and season on guild structure of avian
communities were examined for islands in the estuary zone of the
Columbia River, Oregon. Bird species were classified into guilds
according to their major food item, typical foraging substrate, and
foraging behavior. Variation in community structure indices (number of
guilds,...
The research involved development of two ecological
simulation models to explain the complex dimensionality of
chinook salmon (Oncorhynchus tshawytscha) life history
structure (represented by the age composition of the
spawning stock) and management difficulties entailed in the
complexity.
Since different sizes of chinook salmon are thought to
adapt differently to...
Development of a performance analysis for propeller type wind
turbines is presented. The analysis uses a strip theory approach
that includes tip-loss and blade interference. A comparison is
presented between analysis and test data. The comparison indicates
that the analysis predicts wind turbine performance to an accuracy
that is within...
The hypotheses of this study stated the following:
Interaction with the computer game will significantly
increase the class means in: (1) mathematical
achievement, (2) attitudes toward mathematics, and (3)
graphing ability in high school advanced algebra.
ALGEBRA ARCADE is a computerized simulation game
played on a coordinate grid. One can...
The objective of this study is to complete life cycle inventories (LCI) for laminated veneer lumber (LVL) and composite I-joist (I-joist) production in the two main forest products producing regions in the U.S., the Pacific Northwest (PNW) and Southeast (SE). LVL and I-joists are composite wood building materials that are...
This document contains a result of a study to determine the role of hatchery-reared winter steelhead in steelhead fisheries. The study examines the contribution of these salmon ‘with respect to’ angling intensity, number of fish stocked, contribution of native stocks, and several other factors. It also investigates survival of hatchery-reared...
The purpose of this study was to compare the Chapter I supplemental mathematics program CAI with other Chapter I supplemental mathematics programs, Prescription Learning and the traditional "pull-out" program, in terms of achievement and retention of mathematics basic skills. There were 577 Chapter I students from 12 middle schools and...
The internship I performed was with Rural Community Development Program (RCDP), a domestic non-governmental organization in the country of Nepal. This organization focuses on community development goals in rural communities, utilizing the efforts of volunteers within the context of environmental conservation ideals. I primarily worked with the associated community plant...
______________________________________________________________________________
Committee Member: Dr. Mark WilsonI understand that my final report will become part of the
"It appears that the summer of 2003 was very likely warmer than any other
summer in Europe back to 1500" (Luterbacher, 2004). This was the conclusion of a
study about the changing climate of Europe by climatologists at the University of
Bern, Switzerland, and published in Science in May, 2004....
Accurate taxonomy is essential to preservation and management of native
grasses. Four problems in fescue taxonomy were investigated: the identity of the
native fescue that dominates western Oregon and Washington prairies, the relationship
of native Festuca roemeri to closely related grasses, the status of F. howellii and F.
washingtonica, and...
The goal of this study was to develop an understanding of the nature of surge wave loading on
wood framed residential structures for a variety of building configurations and test conditions.
The objectives of the study were: (1) to measure forces on a 1/6th scale wood framed
residential structure, (2)...
The migrations, distribution, and feeding of American shad, Alosa
sapidissima (Wilson), were studied from February 1980 through January
1981 in the Columbia River Estuary, an important rearing zone for
young-of-the-year shad. Sampling was performed with purse seine,
beach seine, and otter trawl.
Adult shad and large numbers of juveniles from...
Willamette Valley wetland and upland prairies are some of the most endangered ecosystems in the United States, and provide habitat for many federally listed species. Because these are dynamic systems, subject to ecological succession and invasion by aggressive non-native species, prairies require active management to maintain management goals. This is...
A variety of stakeholders require information about marine systems. In the open ocean, pilots of marine vessels require knowledge about environmental conditions for safe passage and route planning. On the coastline, communities rely on information about nearshore dynamics to increase safety from coastal hazards such as nearshore pollutants, coastal erosion,...
This investigation was designed to investigate the use of an answer-until-correct procedure on multiple-choice quizzes in an independent study mathematics course. This procedure was compared to the standard multiple-choice procedure with respect to student achievement, student anxiety, and test reliability. Using the answer-until-correct procedure students were made immediately aware of...
The purpose of this study was to compare the accuracy of eight
anthropometric regression equations with hydrostatic weighing for
predicting the percent body fat of adult males with Down Syndrome
(DS). Body fat percentages were predicted for 18 adult males with DS.
Skinfold, circumference, and bioelectric impedance analysis data were...
This study focuses on the development of a methodology
to evaluate safeguardability of various processes in the
nuclear fuel cycle.
National and international implementation of safeguards
systems has been investigated. It was concluded that
proliferation is purely a political question that,
hopefully, can be prevented by international norms and
diplomacy;...
Remote sensing techniques have long been useful in quantifying changes in ecosystems and the field of remote sensing is constantly evolving to better assess and describe changes, both spatially and temporally. In this thesis I explored the novel use of two remote sensing methods to quantify ecosystems; repeat photograph to...
This investigation was designed to study articulation between
Oregon secondary mathematics programs and college mathematics at
Oregon State University. Three main facets of the problem were
studied:
1. The relationship of several factors to the CEEB Level I
Mathematics Achievement Test score.
2. The feasibility of a discriminant function as...
Most vertebrates exhibit seasonality in many life history traits. Such seasonal rhythms are temporally organized via the transduction of environmental cues (e.g., photoperiod, temperature) into appropriate endocrine signals. However, among ectothermic vertebrates that undergo continuous winter dormancy, temperature is the only environmental cue available for synchronizing seasonal rhythms. Most intriguing...
Debris flows are a major cause of disturbance to riparian vegetation. Both observational and experimental studies were used to examine the initial recovery of riparian vegetation after debris flows on headwater streams in the western Cascades of Oregon. My goal was to determine the roles of seedlings and vegetative sprouts,...
Many studies suggest that weedy plant species are most successful when
soil nitrogen in abundant. Consequently, I used soil nitrogen manipulations to
determine if altering nitrogen would affect the establishment of both weedy and
native plant species in a western Oregon wetland prairie. In two studies, we
added carbon amendments...
The fungus Nothophaeocryptopus gaeumannii is the causative agent of Swiss needle cast (SNC), a foliar disease of Douglas-fir. Disease is characterized by premature loss of foliage and reduced growth resulting from the inhibition of photosynthesis due to the occlusion of stomata by the ascocarps of N. gaeumannii. Although the disease...
In order to address the energy needs of developing countries and remote communities, Oregon State University has proposed the Multi-Application Small Light Water Reactor (MASLWR) design. In order to achieve five years of operation without refueling, use of 8% enriched fuel is necessary.
This dissertation is focused on core design...
Prior to European settlement, native prairie dominated the landscape of the
Willamette Valley. Today, due to urbanization, agriculture, and the cessation of
burning, only isolated remnants of these grasslands still exist. In response to
conservation concerns, there has been a move to restore the remaining prairies in the
Willamette Valley,...
In recent years, there has been an increase in episodic coastal hypoxia along the mid to inner-shelf waters off the Oregon Coast. Wind-driven coastal upwelling events can exacerbate the magnitude of these hypoxic events, causing extremely hypoxic bottom water (<0.5ml l-1 dissolved oxygen) to move onshore towards the inner shelf....
Two mathematical computer games, POE and EQUATIONS, were used to
test the effects of games as learning aids in a university entry-level
intermediate algebra course. Specifically, this study investigated
whether use of these games would significantly increase student achievement
in the course and improve student attitude toward mathematics.
EQUATIONS is...
An analytical model leading to the pressure distribution on
the cross section of a Darrieus Rotor Blade (airfoil) was constructed. The model was based on the inviscid flow theory and the contribution of the nonsteady wake vortices was neglected. The
analytical model was translated into a computer code in order...
Computers
are
very
efficient
in
handling
the
problems
which
deal
with
iteration.
Numerical
treatment
of
the
unsteady
energy equation
is
one
sort
of
iteration.
The
convergence
of
the
unsteady
film
coefficient,
in
two
dimensional
space,
to
its
steady
state
value
has
been
deduced
by
comparison
of
the
results
of
the...
Wheat is an important cereal crop in the Willamette Valley of
Oregon and the stiff-strawed, high yielding winter varieties are
the predominate types grown although spring varieties are not uncommon.
Because of the mild, often open winters; present in the
Willamette, it is not unusual to be able to seed...
The analysis of rigid hub, three-bladed horizontal-axis,
axisymmetric wind turbines in yaw is made using a linearized,
four-degree-of-freedom model. The linearized equations of motion of
rotor and nacelle are developed using quasi-steady blade element
theory and Lagrange's equations.
The yaw behavior of the system is studied from coefficients of
the...
A design for an agricultural airplane is developed and evaluated,
A biplane configuration was adopted since it provides better maneuverability
and stall characteristics than a monoplane of comparable
size and design simplicity. The airplane, powered by a 600-horse-power
Pratt Whitney radial engine, was sized to carry a useful
load of...
Some consideration has been given to the irrigation of winter
wheat in the Willamette Valley of Oregon. This important crop has
yielded quite well since the development and introduction of the
stiff-strawed, semi-dwarf wheats, but, because of the usually dry
early summers, it has been suggested that irrigation of winter...
An experimental investigation has been made of the effect of
vibration on heat transfer from a cylinder in crossflow. The
cylinder used was 3/16-inch in diameter and was sinusoidally
oscillated in the vertical direction by a mechanical drive mechanism
while immersed in an open water channel. Nominal amplitude
ratios, a/d,...
Development of variable speed horizontal axis wind turbines has resulted in a need for an analysis code with a rotor speed degree-of-freedom. This study develops a five degree-of-freedom time domain computer code that evaluates blade and rotor, mean and cyclic loads with nonlinear aerodynamics together with atmospheric turbulence as a...
Reducing the cover of non-native species is one of the challenges of ecosystem restoration. The goal of this study is to identify native species traits that will increase native species cover and reduce non-native species cover in the first growing season at upland and wetland prairie restoration sites. Native and...
This investigation was designed to determine the effectiveness
of video-tape feedback as a technique to modify some selected behaviors
of untrained prospective elementary teachers. Four verbal
and four nonverbal behaviors were considered; they were: teacher
questioning, teacher telling, teacher distractive verbal, teacher
allowing for pupil verbal, teacher constructive nonverbal, teacher...
The effects of selected atmospheric variables on the power output
of a DOE Mod-2 horizontal-axis wind turbine are studied. Particular
attention is focused on unsteady, nonuniform flow conditions
within the rotor disc as represented by vertical profiles measured at
adjacent meteorological towers. Primary variables are wind speed,
wind direction and...
The purpose of this study has been to investigate the effects of
an activity approach to teaching geometry in certain high schools of
Afghanistan. A brief review of the historical background of mathematics
education especially in Afghanistan has been presented in this
study. Students in the activity approach were involved...
The general theory of characteristics is reviewed for hyperbolic
partial differential equations of n independent variables. The
application of the theory of characteristics is made to unsteady, two-dimensional, rotational, inviscid flows; unsteady, two-dimensional,
irrotational, inviscid flows; and unsteady, axial symmetric, inviscid
flows. The characteristic surfaces and the compatibility relations
are...
Most existing analyses of the blade loads on horizontal
axis wind turbines are conducted using linear steady-state
aerodynamics, but evaluation of loads resulting from wind
turbulence or gusts may not be adequate using these
techniques. This study develops single-parameter
approximations for both the shed wake and trailing wake
components of...
Rotary dryers are the most commonly used wood drying system in the particleboard industry. These dryers also play an increasingly important role in drying wood residues for fuel. Many potential benefits may be realized through an improved understanding of the rotary drying process. A rotary dryer simulation model was developed,...
Annual cover crops are widely used in the Willamette Valley of Oregon on hill land, in orchards and on overflow river bottom land. Cover crops are grown to prevent soil erosion and to increase soil organic matter. The objectives of this study were to determine the crops that would be...
On account of the abundance of the antique tussock
moth, and the ease with which material for study can be
secured in the vicinity of Corvallis, an investigation
of this insect was thought to be a fitting subject for
my graduation thesis. The work was begun in the spring
of...
An experimental study was made of the average and turbulent
wind characteristics of the flow over a model of a coastal headland.
The scale of the model was 300:1, corresponding to a prototype size
of 500 m.
The data for validation of the model study was obtained from
instruments mounted...
The purpose of this study was to determine the amount of
heterosis in three complex traits in barley and to investigate the
concept of component interaction as a means of producing heterosis.
The complex traits were grain yield, total leaf area, and malting
quality.
Seven varieties of spring barley were...
Softwood plywood is one of the structural wood products studied in the CORRIM
II effort to document the environmental performance of wood product in residential
structures. Life-cycle inventory (LCI) models were developed to provide performance
data for plywood production by tracking all of its inputs and outputs in a gate-to-gate...
The objective of this work was to develop a method for determining stochastic loads on horizontal axis wind turbine blades. Stochastic loads caused by wind turbulence are a major consideration in designing for long life, cost effective wind turbines. The rotor blades are of particular concern because the blades are...
Currently there is a lack of documentation on the
types of teaching methods being used to teach elementary
mathematics in Saudi Arabia, To help meet this need, this
research project studied the verbal behavior of Saudi
Arabian elementary mathematics teachers. A two-fold
problem was addressed.
1. To obtain a description...
Active habitat management plays a key role in the preservation of native ecosystems and rare species, especially in the Willamette Valley of Oregon, where natural succession to woodlands threatens the few wetland prairies remaining after 150 years of agriculture and urbanization. Sidalcea nelsoniana, listed as threatened under the federal Endangered...
This investigation was designed to determine whether a remediation
program concurrent to enrollment in the Calculus could be used
to reveal and remedy student deficiencies involving pre-calculus topics,
promoting a greater degree of success in the Calculus. The instructional
model for the program that was investigated consisted of pretesting
the...
The theory of characteristics is discussed and its scope has
been broadened by its application to the most general form of an unsteady,
two-dimensional, compres sible, rotational, axial- symmetric
fluid flow. Numerical procedure for solving such a problem is outlined.
Several boundary conditions which are common in fluid flow
problems...
This investigation was designed to determine the general achievement,
ability to solve applied problems, and attitude toward the role of
mathematics in science of college calculus students grouped in an
experimental class according to academic major during their first
three terms. The subgroups were biology-business, mathematics,
and science-engineering majors. The...
