Magnetotellurics is used in two geologic settings on scales ranging from 1000-km tectonic structures to local features hundreds of meters wide. These areas are the Midcontinent Rift System (MRS) and its related mantle plume in the northern Midwestern United States and Newberry Volcano in central Oregon.
The MRS study uses...
The contamination of ground water resources represents a serious
problem and a prominent threat to the health of our society. This study
focuses on the leaching of inorganic anions as a function of agricultural
practices under natural field conditions. In order to enhance the
understanding of such leaching processes, this...
An accurate state estimation plays an essential role in power system operation and planning in energy management systems. However, existing multi-area state estimation researches have not focused on the importance of system clustering. The clustering mechanism divides or partitions a system according to user-defined criteria. Few published research works have...
With the miniaturization of microelectronics and increase of processor speeds in the last few decades, thermal management is drastically affecting overall packaging and system capabilities. Due to the special needs introduced, research focusing on microscale cooling has increased. This study combines the positive characteristics of single- and two-phase flows in...
This thesis analyzes the relationship between whiteness, womanhood, and the profession of student affairs using the method of autoethnography and the guiding question: How does my personal understanding of white womanhood affect my work and role as a student affairs practitioner? The researcher identifies three goals at the beginning of...
This thesis explores the experiences of ten asexual and aromantic college students at Oregon State University and the strategies they used to navigate their sexualized and romanticized campuses. The questions that guided this research were about belonging, resilience, kinship, and worldview. Did they feel they belonged to anyone or mattered...
It is hypothesized that increases in pressure drop due to vapor generation during boiling in microchannels can be reduced by extraction of vapor at its point of inception. Ultimately, this local vapor extraction decreases the pressure drop required to drive the flow through a fractal-like branching, microchannel flow network within...
Amines formed by biosynthesis in germinated barley have been
suggested as precursors for N-nitrosodimethylamine (NDMA) in barley
malt dried by direct-fired kilning. This hypothesis was verified by
germinating raw barley and exposing the resulting malt roots and
clean malt to nitrous acid. Quantitation of the NDMA formed indicated
that malt...
Four key aspects of the relationship between predatory hoverflies and the aphid pest Brevicoryne brassicae L. on broccoli were investigated in the Willamette Valley, Oregon USA: 1) the relationship between aphid density and hoverfly oviposition, 2) the larval voracity of key hoverfly species, 3) the preferences of hoverflies and broccoli...
Massive Multiple-User Miltiple-Input Multiple-Output (MU-MIMO) wireless communication systems incorporate promising advanced strong technologies for upcoming 5G communications. To obtain some of the high spectrum and energy e ciencies bonuses brought by MU-MIMO systems, the ability to obtain Channel State information, especially on the receiver side (CSI), is important. To minimize...
Recent technical progress has made new forms of controller
implementations on computers possible. Especially the technique of Fuzzy Logic
Control has found a growing number of applications. Also the development of fast
A/D converters has made the acquisation of data with vision based systems
possible. In this project we combine...
The present study explores the topic of Multiracial Identity Development and how parents play an important role in the identity development of children. The role of parents becomes crucial for parents of Multiracial children as they transmit cultural values, beliefs, language, and practices. Although models of racial identity development exist,...
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Lianelys Cabrera Martinez, Committee Member, representing College of Liberal Arts
It has been estimated that data traffic from the different mobile devices that range from smartphones to machine-to-machine (M2M) devices will exceed 15.9 exabyte per month by the year 2018. With this immense data growth, the current wireless communication systems suffer from the scarcity of the radio spectrum and eventually...
This research explores the viability and effectiveness of using an inertial navigation system (INS) to control a beamforming array of microstrip patch antennas with the aim of reducing users' exposure to electromagnetic radiation. The system reduces radiated power directed toward a cellular phone user to below 10% of the total...
Transmission over wireless networks presents multiple technical challenges due to
noise, interference, fading, power constraints and bandwidth limitation. Different
solutions have been propposed to overcome these issues and some of them are
treated here. Cooperative diversity has been proposed as an implementation for
networks where terminals are restricted to using...
Known as the fourth industrial revolution, digitization is an ongoing trend in all fields, in which various industries are integrating information technologies to support and improve their businesses. Nuclear technology industries have also increased their interest in data-driven methods by leveraging the potential of pattern recognition to identify anomalies and...
Over the past decade the International Commission on Radiological Protection has developed a comprehensive approach to environmental protection that includes the use of Reference Animals and Plants (RAPs) to assess radiological impacts on the environment. For the purposes of calculating radiation dose, the RAPs are approximated as simple shapes that...
This Thesis explores the possibility of increased export and
export earnings stability for Costa Rica after the implementation of
the Caribbean Basin Economic Recovery Act (CBERA) or Caribbean Basin
Initiative (CBI). It was expected that this policy would not only
increase trade and exports for some developing nations in the...
This thesis describes the development of a flash analog-to-digital converter based on
current-mode technique. The advantages of current -mode technique are higher speed,
smaller chip area, and simple division of reference current based on current mirror. A
current-mode comparator is designed consisting of a cascode current mirror and a
current...
A series of factorial experiments (4 x 4 and 4 x 4 x 4) was designed
to investigate the effects of selected combinations of some
major and trace elements upon in vitro rumen cellulose digestion.
Inocula, varying in ratios of clarified rumen fluid (strained through
No. 50 cheesecloth and centrifuged...
The object of the present study was to investigate the stimulatory
or inhibitory effects of barium, boron, bromine, cadmium,
chromium, cobalt, copper, fluorine, iodine, iron, manganese,
molybdenum, nickel, rubidium, selenium, strontium, vanadium, and
zinc upon in vitro rumen microbial activity as measured by the amount
of cellulose digested. Washed suspensions...
Communication in purposeful human activity systems plays a critical role in the design, management, and change management of these systems. However, its impact on and integrated nature in purposeful human activity systems is not well understood from a holistic viewpoint. In addition, a formal definition and methodology for identifying signs...
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...
Raspberries are an important commodity worldwide, with the United States (U.S.) leading fourth in global production in 2017. An important factor when shipping propagated Rubus across the globe is the security of clean plant material verified through pathogen detection methods which is vital in preventing disease spread. A raspberry virus...
Vertical transports of plankton, momentum, heat, and turbulence are modeled. A novel integration of high resolution turbulence and biophysical modeling is used to show the influence of a Kelvin-Helmholtz instability on the vertical migration of simple gyrotactic organisms. A viscous limit on mixing driven by shear turbulence is proposed. Large...
Deeply weathered soils in tropical rainforests and savannas are classified as Ferralsols according to the World References Bases for Soil Resources (WRB). Ferralsols are most nearly akin to the Oxisols order defined in the US Soil Taxonomy. The acidity, low cation exchange capacity, and strong phosphorus retention by the oxidic...
The main purpose of this research is to provide the
commercial seafood industry of the Pacific Northwest
information on preferences of restaurateurs, retailers, and
wholesalers for whole albacore, low-value added albacore
products (chunks, medallions, and steaks), albacore loins,
and high-value added albacore products (hot smoked and lox).
All of these...
This thesis describes a control tool for managers of a
Broiler Breeder Farm, a farm which raises chickens for the purpose
of fertile egg production. It presents the development of
a simulation of a Broiler Breeder Farm which uses a deterministic
step by step process to generate expected values of...
This research explored the self-concept of Chicanas in terms of their lived experiences and how those experiences influenced the shaping of their identity. It examined the multiple labels Chicanas use to self-identify and the context or situations in which they use specific labels. Moreover, it took into account the influence...
In social and biological evolution, infelicity can operate as a driving
motor to force change. In this essay, for life other than human, infelicity is
equated with physical unfitness to compete for the resources of a specific
niche. For humanity it is defined as the result of an incongruity between...
Tuna fishery is an important activity worldwide. In the
eastern Pacific Ocean the effort applied by the Pacific Ocean
fleet to catch tuna fish is considerable. The eastern Pacific
tuna fleet harvests throughout the oceans and captures an
important fraction of this resource. For instance, in 1980 the
total catch...
The purposes of this phenomenological inquiry was to examine the challenges faced by administrative leaders of Disabled Student Programs and Services (DSPS) at California community colleges (CCC) from the perspectives of current practitioners. This study was undertaken for the following reasons: (a) the increasing number of students with disabilities accessing...
The genus Platylygus Van Duzee was erected in 1915 and revised by Kelton and Knight in 1970 describing 26 new species from United State and Mexico. Despite this prior revision, taxonomic problems have been encountered with the use of the keys and in the identification given the close similarity among...
The purpose of this study was to look at how Latinx fraternities and sororities influence a Latinx student’s identity development, academics, and their sense of belonging at a historically white university. A qualitative narrative study was utilized to understand the experiences of the four participants and their responses to the...
This thesis explored the experiences of four Student Affairs practitioners working within Multicultural Affairs (MA). The purpose of this qualitative study was to examine how professionals within MA offices were developing and conducting assessment as well as identify barriers they faced and best practices used. Data for this study was...
Lean manufacturing, or more generally continuous improvement (CI), has been the methodology behind significant improvements in quality, work in process inventory reductions, lead time reduction and cost reduction while conversely being associated with failed implementations and occasionally with unpopular work practices. This research focused on promoting understanding of CI methodology...
Effects of inbreeding coho salmon (Oncorhynchus kisutch) on
survival during early life history, growth, feed efficiency, and
resistance to gas bubble disease were studied. No effect of inbreeding
could be associated with either F=0.25 or F=0.125. Tetraploidy
may help explain the absence of inbreeding depression at these
levels.
Massive MIMO is a promising technique for future 5G communications due to its high spectrum and energy efficiency. To realize its potential performance gain, accurate channel state information at transmitter side (CSIT) is essential. Frequency division duplex (FDD) is widely employed by the most cellular systems today. However, it requires...
A new decentralized nonlinear controller for Robot Manipulators is
presented in this thesis. Based on concepts of Lyapunov stability theory and
some control ideas proposed in [3]-[7], we obtain continuous nonlinear
decentralized control laws which guarantee position and velocity tracking to
within an arbitrarily small error.
Assumptions based on physical...
Turbo codes have been used successfully for error correction in digital communications, however, their application to wireless mobile communications is still a fresh research topic. The objective of this thesis is to present a new solution that involves the usage of turbo codes, spatial diversity, and orthogonal complementary codes in...
Various methods and techniques have been introduced and applied to advance the state of the art of mobile wireless communications technology. For example, some techniques are applied to overcome the problem of multipath caused by the mobile environment. Multipath produces replicas of the wanted signal which arrive at the receiver...
Recently, the demand for higher data rates of transmission has increased in
many wireless communication applications. Using multi-transmit and multi-receive
antennas has been shown to be a solution, since it can increase the channel capacity to
accommodate higher transmission rates. Among the popular techniques developed to
exploit the use of...
An adaptive decentralized nonlinear controller for a robot manipulator
is presented in this thesis. Based on the adaptive control schemes designed
by Seraji [18], Dai [30], and Jimenez [31], we redesigned and further
simplified the control algorithm and, as a consequence, we achieved better
path tracking performance.
The proposed adaptive...
This thesis concerns the development of a direct torque control strategy using a sliding mode control approach to optimize the power output of an oscillating water column (OWC) wave energy converter (WEC). The OWC WEC is a device that has a submerged vertical tail tube open at both ends, which...
In wireless communication, channel state information (CSI) is essential for data detection. Fast fading coefficients estimation is important in order to acquire accurate CSI. Kalman filters (KF) are widely used for real time parameter estimation and can be used to estimate the fast fading coefficients of a mobile communication channel....
In this dissertation, we explored multiple coding techniques to reduce energy consumption, improve performance, and secure wireless sensor networks specifically and ad-hoc networks in general. With the introduction of Internet of Things (IoT) and 5G technologies, wireless sensor networks are quickly emerging as an important and key technology in the...
Continues-Time (CT) Delta-Sigma (ΔΣ) Analog-to-Digital Converters (ADCs) have one important constrain, namely the excess loop delay. Most previous excess lop delay compensation methods need to know the exact value of the excess loop delay in advance. However, the value of the excess loop delay is a uniformly distribution random variable....
As the power system grows larger and more complex, real-time monitoring and control become very significant in order to achieve reliable operation of the power system. Before any security assessment can be made or control actions are taken, the reliable estimate of the existing state of the system must be...