Freshwater systems are an important component of the global carbon cycle as they outgas disproportionately large quantities of carbon compared to the terrestrial landscape. Of particular importance are headwater streams, which represent roughly 90% of the channel network by length and have been conservatively estimated to outgas roughly 36% of...
Hyporheic Exchange Flow (HEF) is driven by head gradients defined by the hydro-topography of the stream surface, which is controlled by the particular geomorphology of the stream. We quantified the impact of large wood, which typically exerts a strong control on stream morphology, on HEF in a second order, low...
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Roy D. Haggerty
Hyporheic Exchange Flow (HEF) is driven by head gradients defined by the
The exceptional feature of the brushless doubly-fed
machine is the lack of need for frequent replacement of
brushes. The inherent instability of this machine has to be
overcome for its application in adjustable speed drives and
variable speed generation systems.
Specific objectives were:
to study the characteristics of the machine...
Elevated groundwater nitrate (NO3
-) concentrations in the Southern Willamette
Valley (SWV) caused the Oregon Department of Environmental Quality (ODEQ) to
declare a Groundwater Management Area (GWMA) in Spring, 2004. To better
understand direction of groundwater flow, groundwater age, and nitrate transport
pathways of the SWV we developed a steady-state...
A microprogramming teaching tool was designed and implemented. This tool was based on the Am 2900 bitslice microprocessor family. It provides tools for understanding software development for a simple bitslice microprocessor.
The design of a point focus, distributed receiver solar power system is presented. It is
shown that a two axis concentrator, with a two axis solar tracker and drive, has significant
advantages over other possible optical systems. It is further shown that each concentrator should
have its own optical receiver...
The feedbacks between hydrology and biogeochemical cycling of nitrogen (N) are of critical importance to global bioavailable N budgets. Human activities are dramatically increasing the amount of bioavailable N in the biosphere, which is causing increasingly frequent and severe impacts on ecosystems and human welfare. Streams are important features in...
Mass transfer processes were evaluated in an artificial, non-uniform porous medium with a power law distribution of diffusion rate coefficients obtained from physical characterization of solute and porous medium. Breakthrough curves of several pulse experiments conducted at different velocities were compared (1) to analytical expressions for concentrations at mass transfer...
An ASR metric and site rating index applied to over 120 municipal and agricultural locations across Oregon, combined with comparison to case study data from existing ASR sites, indicate that more than 50% of selected sites are hydrogeologically suitable for ASR. The ASR metric is a ratio of aquifer storage...
Disk space fragmentation is the proliferation of small and
unusable gaps. This problem is considered within the context of
IBM's VM operating system.
Facing this problem, researchers resorted to using algorithms
based on memory management techniques, such as placement
strategies (first-fit, best-fit, and worst-fit). Solutions based on these
algorithms do...
A model for the spatial and temporal evolution of the gray sericitic (GS) and sericite with remnant biotite (SBr) hydrothermal alteration selvages within the Butte Quartz Monzonite (BQM) of the porphyry copper deposit at Butte, Montana, is presented. The model provides a mathematical description for the location and advance of...
The major purpose of this study was to determine the current status
of family life/sex education programs in the public high schools of
Oregon. A mail questionnaire was submitted to all health teachers in
all the high schools in Oregon. The questionniare was mailed twice to
447 health teachers in...
Understanding groundwater flow in faulted and fractured rock is an important frontier in the field of environmental remediation and in the management of water resources. One example of a site where this is particularly evident is the Santa Susana Field Laboratory (SSFL) in Ventura County, CA where environmental remediation activities...
The performance of multi-user workstations that access files
over a local area network is studied. Such file systems, called
distributed file systems, provide access of remote file systems with a
great degree of transparency. The main objectives are
To study the principles of distributed file systems. specifically
NFS from Sun...
Harney County contains defining characteristics of regions containing arsenic within the groundwater such as its location in the western United States, unique closed basin geography, complex geology, and seasonal groundwater level fluctuations. Confirmation of arsenic concentrations above the Maximum Contaminant Level Drinking Water Standard of 10 μg/L has been observed...
Surface transient storage (STS) in stream ecosystems serve an important function in retaining nutrients and refugia for aquatic communities. Unfortunately, they can retain contaminants as well. Therefore, it is of importance to determine the residence time distribution (RTD). A RTD of a particular STS zone encompasses the time it takes...
After three decades of active research coupling hydrology and stream ecology, the connection among solute transport, metabolism and processing is still unresolved. These knowledge gaps obscure the functioning of stream ecosystems and how those ecosystems interact with other landscape processes. We must resolve these challenges to wisely manage water resources,...
The purpose of the study was to compare the visual-motor performance
of college students who reported ingestion of certain drugs with
those college students who reported no drug ingestion. The study
drugs included the following drugs or groups of drugs: tobacco,
alcohol, marijuana, LSD, mescaline, barbiturates, and amphetamines.
A total...
An
investigation was
made
into certain
aspects
of
protein
synthesis
at
different
developmental stages
of the
flesh fly
Sarcophaga
bullata.
This
included
measurements
of the
incorporation of
labeled
amino
acids into
protein
by intact cells
from
a
single
organ, the
larval
fat
body,
and
a
study
of
amino
acid
activating...
Increasing demand for exploitation of natural resources
in federal-municipal watersheds in the Western United
States has caused conflicts involving municipalities, the
U.S. Forest Service, and community interest groups. Better
understanding of the resource management process is needed
to help resolve these conflicts.
The objectives of this study were to document...
Linear phase variable filters that are obtained with a frequency transformation of the form cos(ω) = P(cos(W)) were analyzed, where P is a finite degree polynomial, ω is the prototype frequency and W is the transformed filter frequency. A new transformation of third order is proposed. The new variable filter...
The experiment described in this paper was designed and carried out to study the ability of five provenances of white spruce of acid soil origin and five provenances of basic soil origin grown on an did and a basic soil to utilize and respond to the five macro-nutrient elements N,...
Increasing automation and highly flexible manufacturing processes cause increasing complexity for manufacturing system. FMS (Flexible Manufacturing System) is an approach to solve this problem. Since the elements of the FMS and manufacturing process performance are closely interrelated, the application of simple modeling and emulation techniques in the planning stages for...
This dissertation introduces a new idea for frequency
domain deconvolution of speech signals. The idea is to
approximate a unit sample by a Gaussian pulse. The
deconvolution is performed by designing a glottal inverse
filter that will estimate the excitation of the vocal tract.
Then, the excitation will be used...
Frequency domain design of deconvolution filters is
studied using Fast Fourier Transform. Filters for both the
spike and the Gaussian reflector wavelet are obtained. True
deconvolution filters are infinitely long IIR filters,
and frequency domain analysis is an effective way of
finding its optimum finite length approximation for an
arbitary...
The resolution of multiple overlapped reflections is
achieved by designing inverse filters using frequency
domain deconvolution. A careful study reveals a number of
problems involving frequency domain design of spike inverse
filters. These include the presence of noise and aliasing
in both the filter response and its output resulting from...
We examined the spatial and temporal variability of stream carbon dioxide (CO₂) and the drivers of these variations in a headwater catchment. To examine temporal variation and drivers, we measured stream and hyporheic pCO₂ at high temporal resolution over 11 months in a 95.9-ha forested headwater catchment in the Western...
This thesis is concerned with the problem of achieving accurate recognition
rates for Cursive Script Recognition (CSR). Cursive Script Recognition is
difficult due to writer variations such as script formation and time non-linearities.
This research entailed analysis and implementation of a Cursive Script
word-level Recognition system using Dynamic Time Warping...
Most general purpose protocols are found to suffer from
inefficiency in an Ethernet LAN environment when used for large
volume data transfer. This is especially true with the TCP/IP family
which was designed for a wide area network. This research work
presents a proof of this inefficiency and proposes a...
Histones are presumed to be of chromosomal origin and provide
both structural and functional elements for chromatin. In like
manner the ribosomal proteins are of ribosomal origin and have
analogous roles. Considerable controversy over their cellular roles
exists because of the inability to compare directly both groups of
proteins. In...