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Results :: Search Electronic Theses and Dissertations (ETDs)

Your search for Keyword inverter control resulted in 131 match(es).


Expectancy Generation and Utilization: An Attentional control Perspective
Author: Shipstead, Zachary Martin
Date: 2007-05-15
Program: Applied Psychology
Abstract: Although the research of Balota, Black and Cheney (1992) has shown attentional deficits in older adults to be detrimental to performance in semantic priming tasks which require a shift of attention away from a presented category, no attempt has been made to link performance to measures of attentional control. The current study utilizes the same paradigm as Balota, Black and Cheney with participants' attentional control measured using the battery of Hutchison (in press). Results show ability not only to generate expectancy for the target category, but to override automatic processes initiated b...
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Frequency Stabilization of an External Cavity Diode Laser Employing Digital control
Author: Drollinger, Cy Taylor
Date: 2006-08-15
Program: Electrical Engineering
Abstract: Optical signal processing can span across bandwidths of hundreds of GHz with resolutions in the kHz range. This can be done by using spectral hole burning materials. A limiting factor in the frequency resolution is the bandwidth of the laser driving the spectral hole burning material. Better control techniques of laser jitter will decrease laser line width and increase frequency resolution of optical processing. This thesis explores the digital control technique of inherent noise in an external cavity diode laser and the use of reconfigurable platform to prototype digital implementation....
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Learning Tactics of Successful Online Learners
Author: Besich, Marilyn Ann
Date: 2005-05-15
Program: Education
Abstract: The relationship between locus of control and academic performance has been documented in numerous studies. However, there are very few studies that have been designed to investigate that relationship with online learners. Individuals with a strong internal locus of control are said to use resources in unique ways, are persistent, and generally reach the goals that they set for themselves. However, it is not known what specific tactics these individuals utilize in order to succeed. The purpose of this study was twofold. The first was to explore the relationship between internal locus of contro...
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Million Dollar Blocks
Author: Flink, Stephen Sperling
Date: 2009-05-15
Program: Architecture
Abstract: Public housing in today's society is an accumulation of truths. These truths are a construct of institutions that are vastly different and sometimes conflicting but control and arrange life within the community. Public housing has transformed into a place of actual and perceived boundaries which constrict the control residents possess within the housing and its surroundings. The lack of control socially segregates, isolates, and stigmatizes residents as well as creates a dangerous environment. The residents' exclusion from outside communities prohibits them from functioning cohesively within s...
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Problematic Eating and Weight control Behaviors Among Native Americans: A Meta-Analytic Review
Author: Maertens, Julie Ann
Date: 2006-05-15
Program: Applied Psychology
Abstract: A ubiquitous clinical stereotype has conventionally associated eating pathology with White, upper-class girls and women. However, recent studies suggest that problem eating behavior and use of unhealthy weight control techniques span many ethnic and socioeconomic groups. High rates of obesity and non-insulin-dependent diabetes suggest that unhealthy eating behaviors may be a particularly serious problem among Native American youth and adults. This meta-analytic review of studies reporting the prevalence of specific eating practices among Native American participants reveals that on average, 18...
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Effects of Manufacturing Conditions, Stresses, Temperature and Humidity on the Performance of an Innovative Fractional Order control Device
Author: Kulkarni, Nachiket Ashok
Date: 2005-12-15
Program: Mechanical Engineering
Abstract: An innovative fractional order control device (Fractor) has been developed. The principal characteristic of the Fractor is a non-integer order power law relationship between the impedance and frequency. The exponent or the order in this power law is the Constant Phase Element (CPE). Warburg impedance is the ideal goal for the optimal performance of the Fractor which is intended for applications in feedback control systems. The Fractor is based on a specially developed material system which involves a synthesized polymer gel interfaced with metal electrodes. The roughness of the electrode is in...
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controller Design for PSS and FACTS Devices to Enhance Damping of Low-Frequency Power Oscillations in Power Systems
Author: You, Ruhua
Date: 2006-05-15
Program: Engineering
Abstract: Low frequency electromechanical oscillations are inevitable characteristics of power systems and they greatly affect the transmission line transfer capability and power system stability. PSS and FACTS devices can help the damping of power system oscillations. The objective of this dissertation is to design an advanced PSS and propose a systematic approach for damping controller design for FACTS devices. Intelligent control strategy which combines the knowledge of system identification, fuzzy logic control, and the neural networks are applied to the PSS design. A fuzzy logic based PSS is develo...
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Effects of Mycofumigation Using Muscodor albus and Muscodor roseus on Diseases of Sugar Beet and Chrysanthemum
Author: Grimme, Eva
Date: 2004-08-15
Program: Plant Pathology
Abstract: Methyl bromide-chloropicrin mixtures are the major chemicals used for soil disinfestation in the U.S. These chemicals are highly efficacious fumigants used for preplant soil fumigation in field and greenhouse production. They control soil-borne diseases, insects, nematodes and weeds. The 1996 International agreement to phase-out methyl bromide for soil fumigation will seriously reduce options for controlling soilborne pathogens. Mycofumigation is the use of antimicrobial volatiles produced by fungi such as Muscodor albus and Muscodor roseus for the control of other microorganisms. A synthetic ...
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Modeling and control of Hybrid Wind/Photovoltaic/Fuel Cell Distributed Generation Systems
Author: Wang, Caisheng
Date: 2006-08-15
Program: Engineering
Abstract: Due to ever increasing energy consumption, rising public awareness of environmental protection, and steady progress in power deregulation, alternative (i.e., renewable and fuel cell based) distributed generation (DG) systems have attracted increased interest. Wind and photovoltaic (PV) power generation are two of the most promising renewable energy technologies. Fuel cell (FC) systems also show great potential in DG applications of the future due to their fast technology development and many merits they have, such as high efficiency, zero or low emission (of pollutant gases) and flexible modul...
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Distributed control of a Segmented and Shape Memory Alloy Actuated Biologically Inspired Robot
Author: Schubert, Oliver John
Date: 2005-08-15
Program: Electrical Engineering
Abstract: Today's robots are limited in mobility, flexibility, and scalability. Their rigid bodies prevent operation in many environments and often restrict movement to a two-dimensional space. Most robotic vehicles cannot operate in a confined space or unstructured terrain and are incapable of climbing surfaces a fraction of their size. Their stiff bodies significantly reduce their performance and present a major weakness. The next-generation robot must be highly adaptable, flexible and capable of operating in many environments. A possible solution is to create a flexible and scalable segmented snake ...
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Integration of actuators and sensors into composite structures
Author: Ehresman, Jonathan David
Date: 2009-08-15
Program: Mechanical Engineering
Abstract: The need for more efficient wind turbine blades is growing in our society. One step in accomplishing this task would be to make wind turbines blades into smart structures. A smart structure is one that incorporates sensors, complete control systems, and active control devices, in order to shed, or redistribute the load placed on the structure. For wind turbine blades this means changing the shape of the blade profile as it encounters different wind conditions. In order to have active control surfaces functioning on wind turbine blades, the existing blades would have to be retrofitted, and the ...
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Vegetative reproduction and the integrated management of Canada thistle
Author: Sciegienka, Joanna Katarzyna
Date: 2009-05-15
Program: Land Rehabilitation
Abstract: Canada thistle (Cirsium arvense (L.) Scop.) is an aggressive, introduced creeping perennial weed that flourishes in a wide variety of environments. Its deep, creeping root system and colony forming tendencies make it one of the most difficult weeds to control. A strategy that incorporates a better understanding of the biology of Canada thistle into the development of an integrated management plan that includes herbicides and biological control could help reduce the dispersal and impact of this species. The objectives of this work were to: 1) determine how Canada thistle emergence and growth ar...
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Multicellular mathematical models of somitogenesis
Author: Campanelli, Mark Benjamin
Date: 2009-08-15
Program: Mathematics
Abstract: Somitogenesis is an important pattern formation process in the developmental biology of vertebrates. The phenomenon has received wide attention from experimental, theoretical, and computational biologists. Numerous mathematical models of the process have been proposed, with the clock and wavefront mechanism rising to prominence over the last ten years. This work presents two multicellular mathematical models of somitogenesis. The first is a phenomenological phase oscillator model that reproduces both the clock and wavefront aspects of somitogenesis, but lacks a biological basis. The second is ...
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Effect of Trace Mineral Supplementation and the use of an Experimental Escherichia coli O157:H7 Vaccine on Escherichia coli O157:H7 Fecal Shedding in Beef Calves
Author: Skinner, Kim David
Date: 2005-12-15
Program: Animal and Range Sciences
Abstract: Two experiments were conducted to evaluate fecal shedding of E. coli O157:H7 in newly-weaned calves. In the first experiment, twenty-four heifers were fed a basal diet composed of wheat middlings and corn grain (15% CP and 79% TDN). Twelve heifers were supplemented with trace minerals to provide an additional 399 mg Cu, 1001 mg Zn, and 707 mg Mn/d. The control diet had no supplemental trace minerals added. All heifers were inoculated with an oral dose of 1010 CFU of E. coli O157:H7. Fecal samples were collected every 18 h for the first three days after dosing and then every three d until d 21 ...
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Extended Cluster Weighted Modeling Methods for Transient Recognition control
Author: Zhu, Tao
Date: 2006-08-15
Program: Engineering
Abstract: This dissertation considers cluster weighted modeling (CWM), a novel nonlinear modeling technique for the electric load transient recognition problem. The original version of CWM is extended with a new training algorithm and a real-time CWM prediction method. In the training process, a new training algorithm is derived that is a mixture of expectation maximization (EM) – least mean squares (LMS). The algorithm addresses the singular matrix inversion problem in EM. A recursive EM-LMS algorithm is developed that allows the CWM to adapt to time varying systems. In the prediction process,...
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The impacts of a stem boring weevil, Mecinus janthinus, on dalmation toadflax, Linaria dalmatica
Author: Schat, Marjolein
Date: 2008-12-15
Program: Ecology and Environmental Sciences
Abstract: Classical biological control of weeds is generally considered an effective, safe, and cost effective tool for controlling widespread weeds in natural areas. However, only 60% of releases have become established and, of those, only 50% have led to control. Therefore, understanding the impacts of agents on target weeds across spatial scales, at different insect densities, and over time can give biological control practitioners the knowledge necessary to improve establishment and success rates. My studies characterized the impacts the biological control agent, Mecinus janthinus, on the rangeland ...
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Gene regulation in the lac operon
Author: Patterson, Kathryn Grace
Date: 2009-08-15
Program: Mathematics
Abstract: The lac operon, a jointly controlled series of genes in the bacteria E. coli, has been studied extensively since the 1940's. The lac operon genes are transcribed and then translated into proteins necessary for transport and digestion of lactose. The operon is activated in the presence of lactose after glucose, the preferred carbon source, has been expended. In this thesis, we introduce a biophysical model using the Shea-Ackers framework for modeling promoter dynamics. The model spans two scales: the inputs are biophysical parameters of molecular interactions and the result is a level of gene e...
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The Effects of Music Therapy on Comfort in the Mechanically Ventilated Patient in the Intensive Care Unit
Author: Besel, Jamie Marie
Date: 2006-05-15
Program: Nursing
Abstract: The purpose of this pilot study was to assess the effects of music therapy on comfort in acute mechanically ventilated patients in the Intensive Care Unit. Mechanical ventilation leads to decreased comfort. Pain and anxiety may increase during this treatment modality, and the literature suggests this may directly affect patient comfort levels. Music therapy as a nursing intervention within the context of comfort, pain, and anxiety of mechanically ventilated patients was investigated. This quasi-experiemental study used a pre-test and post-test design with subjects serving as their own control....
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No-Till Perennial Forage Establishment in Western Montana
Author: Strauch, Oscar Eduardo
Date: 2005-12-15
Program: Animal and Range Sciences
Abstract: No-till forages offer an opportunity to convert old forage stands to high-yielding pastures. Sod, soil water control and forage species are key factors in determining the success of no-till application. Experiment 1 was conducted to determine optimum vegetation control and moisture on alfalfa in the spring. In experiment 2, adapted grasses and legumes were compared under tilled and no-till seedbed preparation to assess their performance. In Experiment 1, the effects of timing of glyphosate [N-(phosphonomethyl) glycine] application, two alfalfa cultivars (including a roundup ready alfalfa) and ...
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Photosynthetic and Glycoalkaloid Responses of Potato (Solanum tuberosum L.) to Colorado Potato Beetle (Leptinotarsa decemlineata Say) Defoliation
Author: Dinkins, Courtney Louise Pariera
Date: 2006-12-15
Program: Entomology
Abstract: Photosynthetic and glycoalkaloid responses of potatoes (Solanum tuberosum L.) to varying levels of Colorado potato beetle (Leptinotarsa decemlineata Say) and manual defoliation were measured on 'Cal Red' and 'Russet Burbank' plants. No alteration in photosynthesis was observed on the remaining tissue of an injured leaf for Cal Red and Russet Burbank leaves defoliated by larval Colorado potato beetles nor for Russet Burbank leaves defoliated by adult Colorado potato beetles. No significant differences were observed between actual Colorado potato beetle and manual defoliation for both varieties....
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JavaCAVE: A 3D Immersive Environment in Java
Author: Milvich, Michael Lazar
Date: 2004-08-15
Program: Computer Science
Abstract: Three-dimensional immersive environments have traditionally been developed using the C and C++ programing language. Do to the increasing performance of the Java platform, the Java language is becoming more accepted for scientific and graphical applications. Currently developers who choose to use Java are being excluded from visualizing the results of their programs in a rich three-dimensional immersive environment. This thesis will work towards correcting this problem by implementing a Java library called JavaCAVE to control a CAVE™ immersive environment. In addition to being a Ja...
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Using Asynchronous Discussions to Facilitate Collaborative Problem Solving in College Algebra
Author: Kosiak, Jennifer Jean
Date: 2004-08-15
Program: Mathematics
Abstract: This research study was conducted to investigate the nature and quality of online mathematical communication that occurred during collaborative problem solving and its effect on mathematical achievement in college algebra. Two intact sections of college algebra were randomly assigned to either a treatment group (online group work) or control group (individual seatwork). Both sections of college algebra met face-to-face and were taught by the same instructor. Students in the treatment group (n = 26) were placed into six collaborative groups. Four week-long online tasks designed according to the...
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Behavioral Consequences of Calcium/Calmodulin Kinase II Inhibition in Rats
Author: Schwartz, Elizabeth Ann
Date: 2005-05-15
Program: Applied Psychology
Abstract: CaM kinase II (CaMKII) comprises 2% of hippocampal protein and plays an important role in learning and models of neural plasticity. Previous studies have employed a variety of techniques to inhibit CaMKII to investigate its role. This includes the use of chemical inhibition, genetic mutation and antisense; all have shown limitations. In the present study, RNA interference (RNAi) was used to inhibit CaMKII in the hippocampus of rats. The goal of this project was to determine if inhibition of hippocampal CaM kinase would result in behavioral deficits consistent with the role of this kinase. Thre...
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Apathy
Author: Dinkins, Jonathan
Date: 2005-05-15
Program: Fine Arts
Abstract: In this show, I'm commenting on the apathetic attitudes of our society that I find appalling. Our culture has become a thoughtless throw-away society with an unhealthy consumer drive. We are fixated on fast-everything along with its 'disposable' packaging. The willing and un-willing deterioration of the environment; seen through thoughtless (inhumane) killing for pleasure, unmanaged pest-control, littering, oil spills, and the desire to drill in refuge areas (ANWAR and East Front Glacier National Park); has created a consumer culture that relies on ignorance to excuse itself from environmen...
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Enhanced Step Mode FTIR Position control
Author: Inberg, R. Brandon
Date: 2005-12-15
Program: Electrical Engineering
Abstract: This thesis presents a modification to a typical Fourier transform infrared (FTIR) spectrometer to achieve finer spatial sampling and increased frequency range for step-scan experiments with little modification to the existing hardware. Commercially available step-scan FTIR spectrometers currently have the ability to measure spectra up to 15798 cm-1, which is limited by a HeNe reference laser used for controlling the mirror's position. The proposed technique involves using a digital signal processor (DSP) to measure the HeNe reference signal and estimate the mirror position. The DSP then outpu...
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