The objective of the research presented in this thesis is to develop, implement, and demonstrate the utility of an n-sheet, state-space alternating-current thin-film electroluminescent (ACTFEL) device model. In this model, the phosphor layer is discretized into n + 1 layers, with band-to-band impact ionization, space charge creation/ annihilation, and luminescent...
A method of locating electric transmission line towers using
ground survey data in a digital computer program is presented in this
thesis. The towers are located for maximum spacing subject to the
constraints of available tower heights, forbidden ground areas, minimum
ground clearance, and specified conductor tensions. The digital
method...
With advancements in CMOS technology, high speed analog circuits that were
traditionally implemented with discrete circuit components can now be made monolithically.
Antialiasing filters for video signals as well as signal conditioning filters in high
speed communication channels are examples of applications where high frequency integrated
circuits are now feasible....
Chainsaw users value cutting performance and safety. Knowledge of the forces exerted during sawing are necessary to understand and improve the cutting performance of saw chain. Additionally, cutting forces can be used to form metrics for evaluating performance tradeoffs when using a safety (i.e. low-kickback) saw chain versus a standard...
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John P. Parmigiani
Chainsaw users value cutting performance and safety. Knowledge of
An advanced forward 'area tactical radar network, now under
conceptual development by the Air Force Electronic Systems Division,
can be viewed as a novel form of computer network but with
other unique problems resulting from the specialized nature of the
application. The proposed network will link together a number of...
The pathogenesis, diagnosis and treatment of bacterial
dermatitis and various canine allergic dermatitidies including
allergic inhalant dermatitis, contact dermatitis and
flea allergy dermatitis were studied. The effect of specific
nonprotein and protein components of commercial flea
antigens on the gross and microscopic appearance of intradermal
injections was investigated. Additionally, a...
The purpose of the study was to investigate the effect of trials-to-criterion on the retention of a discrete motor skill (overhand beanbag throw) by moderately mentally retarded and severely mentally retarded individuals. Nonmentally retarded individuals were involved as a control group. The subjects were grouped by degree of retardation and...
This thesis focuses on two aspects of transparent electronics, SnO₂ transparent thin-film transistors (TTFTs) and transparent circuits. Both depletion- and enhancement-mode SnO₂ TTFTs are realized. The maximum effective mobility for the depletion- and enhancement-mode devices are 2 cm²V⁻¹s⁻¹ and 0.8 cm²V⁻¹s⁻¹, respectively. A variety of techniques to decrease the carrier...
Controllable parameters in a power system include generator
terminal voltage, generator input power and network admittances.
These parameters can be controlled to damp
mechanical rotor oscillation in the generators and thereby
improve system transient stability. Explicit equations are
derived in this thesis for the control of these parameters to
introduce...
This thesis develops a simulation model for a cumulative connected
compound direct-current generator to varify the operation of
this machine under conditions of slowly and rapidly changing loads.
The application of this simulation method will contribute to
more exact modeling of power system components. The accuracy
gained is in the...
Fabrication techniques and process integration considerations for amorphous oxide semiconductor (AOS) thin-film transistors (TFTs) constitute the central theme of this dissertation. Within this theme three primary areas of focus are pursued.
The first focus involves formulating a general framework for assessing passivation. Avoiding formation of an undesirable backside accumulation layer...
Neutron flux and gamma-ray dose have been measured in the
experimental facilities of the Oregon State TRIGA reactor.
Thermal neutron flux measurements utilized foil activation
techniques.
The gamma-ray dose was measured with a thermoluminescent
dosimetry system. The thermoluminescent material used was LiF.
Fast neutron spectrum measurements were performed. The
fast...
An algorithm for computing the parameter sensitivities of an excitation system for a hydroelectric generation system is developed for model analysis in this thesis. The IEEE Type 1 excitation system representation, linked with a simplified alternator and voltage regulator equivalent, provide a closed-loop model for digital simulation. Parametric sensitivities are...
The long-term goal of the research project initiated with this thesis is the development of lead-free, fully-transparent ferroelectric devices, such as ferroelectric capacitors or ferroelectric-gate field-effect transistors. Ferroelectric materials exhibit spontaneous polarization with the application of an external electric field, which is persistent upon removal of the applied field, and...
The long-term goal of this research project is the development of solution-based inorganic dielectric and semiconductor materials for inkjet printed electronics. The main focus of this thesis involves testing of the materials and devices under development. A new solution-based inorganic dielectric material (HfOSO₄), given the name hafsox, is developed and...
This thesis proposes a criteria for the evaluation of those variable
parameters that influence the response of a hydroelectric generator
driven by a hydraulic turbine of the Kaplan type. It is considered
a requirement that a unit must be stable when supplying an isolated
load and it is assumed that...
The focus of this thesis is the investigation of thin-film transistors (TFTs) based on amorphous oxide semiconductors (AOSs) in two circuit applications. To date, circuits implemented with AOS-based TFTs have been primarily enhancement-enhancement inverters, ring oscillators based on these inverters operating at peak frequencies up to ~400 kHz, and two-transistor...
The purpose of this study was to identify competencies
which are perceived as important by Thai adapted physical
educators, to determine the differences that exist in the
way physical education professors and adapted physical
educators judge the level of each competency, and to
recommend a set of competencies for adapted...
The objective of this thesis is to provide an initial demonstration of the feasibility of constructing highly transparent active electronic devices. Such a demonstration is successfully achieved in the fabrication of ZnO-based thin film transistors (TFTs) exhibiting transparency greater than ~90% in the visible portion of the electromagnetic spectrum and...
Interest in nanomaterials is motivated partly by their potential for sensor arrays to detect
different gases. Nanowires in particular are of interest because their high surface-to-volume
ratio promises the possibility of high sensitivity. However, because of their discrete
quasi-one-dimensional geometry, electrical integration of nanowires into photolithographically
defined devices and circuits...
In this thesis, a digital computer method for locating transmission
line towers is presented. The computer program selects the
position of both angle and tangent type towers for a given ground profile.
This selection will provide a minimum cost per foot of
transmission line in terms of the average costs...
This thesis develops a simplified and logical simulation model
for an amplidyne excitation system for a synchronous generator with
an automatic voltage regulator.
The non-transfer function representation using field determined
parameters including variable inductance and machine saturation
was used to reduce the computing time for the stability analysis.
The simulation...
The trend towards higher resolution, faster refresh rate active-matrix liquid-crystal displays (AMLCDs) as well as the emergence of active-matrix organic light-emitting diode (AMOLED) displays is driving the demand for amorphous oxide semiconductor thin-film transistors (AOS TFTs) with higher mobility. A physics-based model for carrier transport in an amorphous semiconductor is...
A method is developed for calculating the reactivity
worth of the heavy water coolant of the Plutonium
Recycle Test Reactor (PRTR). The coolant reactivity
worth is determined by calculating the effective multiplication
constant of the reactor core with and without
the coolant in given process tubes. The calculational
method includes...
The aim of the research undertaken for this thesis was to develop a new high-performance amorphous oxide semiconductor (AOS) for use as a channel layer in a thin-film transistor (TFT). AOS TFTs offer higher electron mobility than the established amorphous silicon based technology. A new channel material comprised of aluminum...
This simulation is a model for a tidal power-peaking plant that
can be used to determine the electrical peaking generation for a given
set of conditions.
The simulation internally contains a tide producing function
for a specific year, the hydraulic characteristics of the plant, and the
plant's machines' characteristics. The...
A method of calculating the normal vibrations of polymer molecules
is presented in detail. The method is based on that used by
Schachtschneider and Snyder in their analysis of polypropylene but
has not heretofore been published. The factoring of the infinite matrix
and reduction to the coordinates of the unit...
A prototype deep ocean nuclear moisture meter was developed
based on the detection of epithermal neutrons backscattered from
marine sediment molecules. Development consisted of choosing a
source, a detector, containment materials, and associated counting
equipment, followed by the construction and calibration of the probe.
Thermal neutron response of the probe...
The aim of this dissertation is to develop oxide semiconductors by radio-frequency
sputtering for thin-film transistor (TFT) applications. A variety of oxide semiconductors
are used as the TFT channel layer, including indium gallium oxide (IGO), zinc tin
oxide (ZTO), and indium gallium zinc oxide (IGZO). The variety of materials used...
The goal of this thesis study is to develop an activated reactive evaporation (ARE) system and to demonstrate its utility by fabricating-alternating current thin-film electroluminescent (ACTFEL) oxide phosphor devices. ARE entails evaporation in an activated gas. The main ARE system components are three thermal evaporation sources, a microwave power supply,...
Purpose: The major purpose of this study was to determine the readability of selected patient education materials for older adults using the cloze procedure as a criterion. Actual cloze test scores from three selected passages on hypertension were compared with the Coleman readability scores on those same passages. Age and...
The objective of this thesis is to contribute to the development of p-type materials for transparent electronics applications. Thin films of ®-BaCu2S2, a p-type semi-transparent semiconductor, are fabricated and characterized. ®-BaCu2S2 has a transmittance of 60% to 80 % in the visible portion of the electromagnetic spectrum. The mobility, conductivity,...
Movement intent decoders, which interpret volitional movement intent from human bioelectric signals, can be incorporated into modern neuroprostheses to offer people living with limb loss or paralysis the potential to regain their lost motor control. Machine learning methods have become the research standard for continuous decoders with high degrees of...
A low-energy, low-exposure-rate, guarded-field ionization
chamber system with a sensitive volume of approximately 1040 cm³ and an exposure-rate range from 60 mR/h to less than 0.5 mR/h
was designed, constructed and calibrated. The calibration was
effected by constructing and calibrating a 60 cm³ volume transfer
chamber of similar design against...
The capabilities of the Tektronix Model J2C/7J20 Rapid Scanning
Spectrometer for the determination of molecular species resulting from
Otto cycle combustion were experimentally investigated after a literature
search of the subject area. Combustion of hydrogen-air, carbon monoxideair,
and gasoline-air mixtures in the combustion chamber of a Cooperative
Fuel Research engine...
The tremendous growth of wireless and mobile communications has resulted in placing of stringent requirements on the channel spacing and, by implication, on the phase noise of oscillators, typically mandating the use of passive LC oscillators with high quality factor (Q). However the trend towards large-scale integration and low cost...
The objective of the work reported herein is to explore the impact of decreasing channel thickness on radio-frequency (RF) sputtered amorphous indium-gallium-zinc oxide (a-IGZO) thin-film transistors (TFTs) electrical performance through the evaluation of drain current versus gate voltage (I[subscript D] − V[subscript G]) transfer curves. For a fixed set of...
This fault detection scheme is based on sampling the instantaneous
phase voltages and checking their sum and magnitude against
a specified voltage. Faults on the system cause unbalances and
distortion of the phase voltages and currents. The currents and
voltages change in magnitude and/or phase position with respect to
the...
The purpose of this study was to compare the
reverse-chaining and forward-chaining instructional
methods in teaching a motor task to mentally retarded
individuals. The subjects were selected from Fairview
Training Center, Salem, Oregon. Each of the subjects
was classified as mentally retarded with a range from
moderate to severe retardation....
The purpose of this study was to compare the
reverse-chaining and forward-chaining instructional
methods in teaching a motor task to mentally retarded
individuals. The subjects were selected from Fairview
Training Center, Salem, Oregon. Each of the subjects
was classified as mentally retarded with a range from
moderate to severe retardation....