Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Electronic Theses and Dissertations

Discipline
Institution
Keyword
Publication Year

Articles 8311 - 8340 of 10930

Full-Text Articles in Entire DC Network

Knowledge Based Measurement Of Enhancing Brain Tissue In Anisotropic Mr Imagery, Eric Leach Jan 2007

Knowledge Based Measurement Of Enhancing Brain Tissue In Anisotropic Mr Imagery, Eric Leach

Electronic Theses and Dissertations

Medical Image Analysis has emerged as an important field in the computer vision community. In this thesis, two important issues in medical imaging are addressed and a solution for each is derived and synergistically combined as one coherent system. Firstly, a novel approach is proposed for High Resolution Volume (HRV) construction by combining different frequency components at multiple levels, which are separated by using a multi-resolution pyramid structure. Current clinical imaging protocols make use of multiple orthogonal low resolution scans to measure the size of the tumor. The highly anisotropic data result in difficulty and even errors in tumor assessment. …

Go to article

Engendering Agency: Literacies, Social Action, And Wangari Maathai S Green Belt Movement, Cassandra Marie Allen Jan 2007

Engendering Agency: Literacies, Social Action, And Wangari Maathai S Green Belt Movement, Cassandra Marie Allen

Electronic Theses and Dissertations

This thesis analyzes the life and work of Nobel Peace Laureate Wangari Maathai, one of the foremost African woman rhetors of our time. Wangari Maathai--founder of Kenya's Green Belt Movement (GBM), Member of Parliament, and activist for democracy, sustainable development, and human rights--has cultivated a multidimensional literacy that has allowed her to truly understand and address the problems that post-colonial Kenyans face. Her strong solution-oriented approach has allowed her to develop and refine operation of the GBM, which began simply planting trees, to produce a worldwide organization that works for sustainable development, human rights, and environmental conservation/restoration (among many others) …

Go to article

Medium Access Control Protocols And Routing Algorithms For Wireless Sensor Networks, Anirban Bag Jan 2007

Medium Access Control Protocols And Routing Algorithms For Wireless Sensor Networks, Anirban Bag

Electronic Theses and Dissertations

In recent years, the development of a large variety of mobile computing devices has led to wide scale deployment and use of wireless ad hoc and sensor networks. Wireless Sensor Networks consist of battery powered, tiny and cheap "motes", having sensing and wireless communication capabilities. Although wireless motes have limited battery power, communication and computation capabilities, the range of their application is vast. In the first part of the dissertation, we have addressed the specific application of Biomedical Sensor Networks. To solve the problem of data routing in these networks, we have proposed the Adaptive Least Temperature Routing (ALTR) algorithm …

Go to article

Friend/Foe Identification Accuracy And Shooting Performance: Effects Of Prior Task Loading And Time Pressure, Kelly Ann Burke Jan 2007

Friend/Foe Identification Accuracy And Shooting Performance: Effects Of Prior Task Loading And Time Pressure, Kelly Ann Burke

Electronic Theses and Dissertations

The current dismounted soldier and the soldier of the future will be "loaded" with more information processing tasks while they perform shooting tasks. It is conceivable that some increased level of cognitive tasking may be performed simultaneously with required shooting tasks. The effect of cognitive load on shooting performance has been previously examined (Scribner and Harper, 2001). This study concentrated on the effect of various cognitive workload demands on a friend-foe discrimination shooting task in a single- and dual-task scenario. In light of this, it is imperative that the soldier not be overburdened mentally, which may result in decreased survivability …

Go to article

The Effects Of Eicu Technology On Clinical Outcomes Of Icu Patients: Analysis Of The Relationship Of Patient, Hospital, And Unit Characteristics To Proximal And Distal Outcomes, Michelle G. Chandler Jan 2007

The Effects Of Eicu Technology On Clinical Outcomes Of Icu Patients: Analysis Of The Relationship Of Patient, Hospital, And Unit Characteristics To Proximal And Distal Outcomes, Michelle G. Chandler

Electronic Theses and Dissertations

Each year approximately five million people are treated in the nation's intensive care units making intensive care one of the most expensive components of the U.S. healthcare system. Of these patients, 400,000-500,000 will die annually giving the ICU the distinction of having the highest rate of mortality and complications in the hospital setting. Studies have demonstrated that one in ten patients who die each day in ICUs might survive if intensivists were present to manage clinical care and direct treatment plans (Randolph & Pronovost, 2002; Dimick, Pronovost, Heitmiller & Lipsett, 2001; Pronovost et al., 2002). The utilization of supplemental remote …

Go to article

Far-Infrared/Millimeter Wave Source And Component Development For Imaging And Spectroscopy, Todd Du Bosq Jan 2007

Far-Infrared/Millimeter Wave Source And Component Development For Imaging And Spectroscopy, Todd Du Bosq

Electronic Theses and Dissertations

The far-infrared and millimeter wave (FIR/mmW) (wavelength 75 micrometer to 10 mm) portion of the electromagnetic spectrum is fairly underdeveloped technologically, owing to the large amount of atmospheric attenuation in that range. At present, the FIR/mmW region is lacking in compact, high-brightness radiation sources and practical imaging systems. This dissertation focuses on development of two complementary technologies in this area - an active mmW imaging system and high-reflectivity Bragg mirrors for the FIR p-Ge laser. The imaging system uses a vector network analyzer in the frequency range of 90-140 GHz as the radiation source and receiver. Raster scanning is used …

Go to article

Environmental Security In The Global Capitalist System: A World-Systems Approach And Study Of Panama, Mark Allen Freeman Jan 2007

Environmental Security In The Global Capitalist System: A World-Systems Approach And Study Of Panama, Mark Allen Freeman

Electronic Theses and Dissertations

The current global capitalist system is at odds with environmental protection and the protection of indigenous people that are directly linked to the land on which they live. In environmental security literature, many have argued that, theoretically and functionally, it is possible to link national security with environmental security. However possible this may be on paper, in practice, the global capitalist system prevents this from becoming a reality. Using a world-systems approach, this thesis will show that core countries seeking to expand capital by tapping into new markets, locating new sources of raw materials and even forming strategic military partnerships …

Go to article

Sex-Biased Parasitism And The Reproductive Costs Of Parasites In A Social African Ground Squirrel, Melissa Ann Hillegass Jan 2007

Sex-Biased Parasitism And The Reproductive Costs Of Parasites In A Social African Ground Squirrel, Melissa Ann Hillegass

Electronic Theses and Dissertations

Vertebrate males frequently carry higher numbers of parasites than females. This bias in parasite loads could be a consequence of sexual selection. Grouping species are also assumed to be afflicted with larger numbers of parasites than solitary animals and associated costs of this parasitism could vary with group size or structure. I examined sex-biased parasitism and the influence of group size on parasite loads in Cape ground squirrels (Xerus inauris), a highly social species that occurs in the arid regions of southern Africa. Males carried three times as many ectoparasites as females, but females harbored nearly three times more endoparasites …

Go to article

Does Habitat Affect Clonal Demography? An Experiment With Polygonella Myriophylla In Roadside And Florida Scrub, Kristina Dianne Horn Jan 2007

Does Habitat Affect Clonal Demography? An Experiment With Polygonella Myriophylla In Roadside And Florida Scrub, Kristina Dianne Horn

Electronic Theses and Dissertations

Polygonella myriophylla (Polygonaceae) is a clonal shrub listed as endangered and narrowly endemic to pyrogenic scrub ecosystems in central Florida. It is almost restricted to gaps within the matrix of shrubs in the scrub but also occurs along adjacent road-side habitats. I hypothesize that persistent disturbed microhabitats and more dynamic sand accretion in roadsides will increase rooting probabilities compared to more stable scrub habitats, affecting survival, growth and reproduction. In April 2004- March 2006, I compared plant (genet) and basal branch (ramet) performance between experimentally manipulated plants in native scrub and roadside habitats at two locations within the Lake Wales …

Go to article

Characteristics Of Academic Writing In Education, Andrew Kemp Jan 2007

Characteristics Of Academic Writing In Education, Andrew Kemp

Electronic Theses and Dissertations

According to Stangl (1994), Jalongo (2002), Richards and Miller (2005) and a host of other authors regarding publishing in educational journals, understanding the audience for an article is of utmost importance. Huff (1999) notes that an author must understand the audience for whom s/he writes. While much of this understanding of audience comes down to suitable topics (Silverman, 1982), articles must also fit the style of the journal to which it is being presented (Olsen, 1997). With this in mind, the purpose of this study is to characterize the writing style of academic writing in education. This research will involve …

Go to article

Recognizing Teamwork Activity In Observations Of Embodied Agents, Linus Jan Luotsinen Jan 2007

Recognizing Teamwork Activity In Observations Of Embodied Agents, Linus Jan Luotsinen

Electronic Theses and Dissertations

This thesis presents contributions to the theory and practice of team activity recognition. A particular focus of our work was to improve our ability to collect and label representative samples, thus making the team activity recognition more efficient. A second focus of our work is improving the robustness of the recognition process in the presence of noisy and distorted data. The main contributions of this thesis are as follows: We developed a software tool, the Teamwork Scenario Editor (TSE), for the acquisition, segmentation and labeling of teamwork data. Using the TSE we acquired a corpus of labeled team actions both …

Go to article

Human Sexuality Education In The Middle Grades Classroom: A Review Of Curricula In A Sample Of Florida School Districts, Melinda Myrick Jan 2007

Human Sexuality Education In The Middle Grades Classroom: A Review Of Curricula In A Sample Of Florida School Districts, Melinda Myrick

Electronic Theses and Dissertations

This study examined the extent to which human sexuality topics are covered in Florida middle school science classrooms and the process by which curricular decisions are made regarding human sexuality education on a county-wide basis. Primary data included interviews with county-level administrators who oversee curricular decisions related to the middle-grades science curriculum or health curriculum in twelve school districts within the state. These districts represented four geographic locations and districts of various sizes. Administrators from four of the twelve studies in the sample chose to provide information regarding their human sexuality education curriculum. In two cases, teacher leads were identified …

Go to article

Examining Sociomathematical Norms Within The Context Of Decimals And Fractions In A Sixth Grade Classroom, Marino Nardelli Jan 2007

Examining Sociomathematical Norms Within The Context Of Decimals And Fractions In A Sixth Grade Classroom, Marino Nardelli

Electronic Theses and Dissertations

Social norms are patterns of behavior expected within a particular society in a given situation. Social norms can be shared belief of what is normal and acceptable shapes and enforces the actions of people in a society. In the educational classroom, they are characteristics that constitute the classroom participation structure. Sociomathematical norms are fine-grained aspects of general social norms specifically related to mathematical practices. These can include, but are not limited to, a student-centered classroom that includes the expectation that the students should present their solution methods by describing actions on mathematical objects rather than simply accounting for calculational manipulations. …

Go to article

A Novel Setup For High-Pressure Raman Spectroscopy Under A Microscope, Thomas Andrew Oakeson Jan 2007

A Novel Setup For High-Pressure Raman Spectroscopy Under A Microscope, Thomas Andrew Oakeson

Electronic Theses and Dissertations

Functional properties of biological molecules and cells are affected by environmental parameters such as temperature and pressure. While Raman spectroscopy provides an intrinsic probe of molecular structural changes, the incorporation of a microscope enables studies of minuscule amounts of biological compounds with spatial resolution on a micron scale. We have developed a novel setup which combines a Raman microscope and a high pressure cell. A micro-capillary made out of fused silica simultaneously serves as the supporting body and the optical window of the pressure cell. The cell has been tested over the pressure range from 0.1 to 4 kbar. Raman …

Go to article

Analysis Of Mitochondrial Dna Coding Region Snps By Pyrosequencing, Kyle Robert Carl Parker Jan 2007

Analysis Of Mitochondrial Dna Coding Region Snps By Pyrosequencing, Kyle Robert Carl Parker

Electronic Theses and Dissertations

To date, the use of mitochondrial DNA in forensic analysis has relied on the presence of variations in the control region to differentiate between samples. One problem that this analysis has shown is the occurrence of common Haplogroup H haplotypes or identical sequences. Thus, there is a need to enhance the distinguishing power of this type of analysis. One option has been to investigate the mitochondrial coding region for polymorphisms that could differentiate between samples with identical control region haplotypes. The goal of this study has been to identify polymorphic coding region sites for development in a Pyrosequencing assay that …

Go to article

Journey To The Scars: A White Trash Epic, J. Patrick Rader Jan 2007

Journey To The Scars: A White Trash Epic, J. Patrick Rader

Electronic Theses and Dissertations

Inspired by the work of writers Hunter S. Thompson and Tom Wolfe and motivated by celebrity prevaricator James Frey, Journey to the Scars: A White Trash Epic is a memoir that attempts to redefine the genre by applying the ideals and themes of gonzo and new journalism. The opening chapter, "The Diary of John Doe Frankenstein" tells the story of a pivotal event in the author's life. Immediately following this narrative of a near fatal motorcycle accident, the author/narrator's reliability is called into question and the remainder of the memoir is the story of the author's efforts to uncover the …

Go to article

Nonlinear Optical Properties Of Organic Chromophores Calculated Within Time Dependent Density Functional Theory, Sergio Tafur Jan 2007

Nonlinear Optical Properties Of Organic Chromophores Calculated Within Time Dependent Density Functional Theory, Sergio Tafur

Electronic Theses and Dissertations

Time Dependent Density Functional Theory offers a good accuracy/computational cost ratio among different methods used to predict the electronic structure for molecules of practical interest. The Coupled Electronic Oscillator (CEO) formalism was recently shown to accurately predict Nonlinear Optical (NLO) properties of organic chromophores when combined with Time Dependent Density Functional Theory. Unfortunately, CEO does not lend itself easily to interpretation of the structure activity relationships of chromophores. On the other hand, the Sum Over States formalism in combination with semiempirical wavefunction methods has been used in the past for the design of simplified essential states models. These models can …

Go to article

Things You Realize About Yourself While Sitting Next To A Nun On A Plane Home, Christine A. Davis Jan 2007

Things You Realize About Yourself While Sitting Next To A Nun On A Plane Home, Christine A. Davis

Electronic Theses and Dissertations

No abstract provided.

Go to article

Comparison Of Sparse Coding And Jpeg Coding Schemes For Blurred Retinal Images., Balaji Chandrasekaran Jan 2007

Comparison Of Sparse Coding And Jpeg Coding Schemes For Blurred Retinal Images., Balaji Chandrasekaran

Electronic Theses and Dissertations

Overcomplete representations are currently one of the highly researched areas especially in the field of signal processing due to their strong potential to generate sparse representation of signals. Sparse representation implies that given signal can be represented with components that are only rarely significantly active. It has been strongly argued that the mammalian visual system is highly related towards sparse and overcomplete representations. The primary visual cortex has overcomplete responses in representing an input signal which leads to the use of sparse neuronal activity for further processing. This work investigates the sparse coding with an overcomplete basis set representation which …

Go to article

Pilot Study Of Nutrient Loading In A Wet Detention Lake, Eric C. Gurr Jan 2007

Pilot Study Of Nutrient Loading In A Wet Detention Lake, Eric C. Gurr

Electronic Theses and Dissertations

Florida is surrounded by water, and its many internal lakes and rivers have long been recognized for their excellent fishing and boating. This notoriety draws land developers to the lake shores to establish residential and commercial infrastructure. This land development brings with it flood plain alteration, water level stabilization, and increased nutrients which cause adverse impacts to our lakes. In response, the United States Environmental Protection Agency (EPA) passed the Federal Clean Water Act (CWA) in 1972 which set the framework for the water quality standards for the entire United States. As a result of the CWA many point sources …

Go to article

Eino: An Intelligent Tutor For The University Of Central Florida Infinity Web Applets, James Hollister Jan 2007

Eino: An Intelligent Tutor For The University Of Central Florida Infinity Web Applets, James Hollister

Electronic Theses and Dissertations

This study investigated the various methods involved in creating an intelligent tutor for the University of Central Florida Infinity Web Applets (UCF Infinity Web Applets). After conducting research into various methods, two major methods emerged and they are: solving the problem for the student and helping the student when they become stymied and unable to solve the problem. A storyboard was created to show the interactions of the student and system along with a list of features that were desired to be included in the tutoring system. From the storyboard and list of features, an architecture was created to handle …

Go to article

An Investigation Of Size Exclusion And Diffusion Controlled Membrane Fouling, Colin Michael Hobbs Jan 2007

An Investigation Of Size Exclusion And Diffusion Controlled Membrane Fouling, Colin Michael Hobbs

Electronic Theses and Dissertations

The reduction of membrane productivity (i.e. membrane fouling) during operation occurs in virtually all membrane applications. Membrane fouling originates from the method by which membranes operate: contaminants are rejected by the membrane and retained on the feed side of the membrane while treated water passes through the membrane. The accumulation of these contaminants on the feed side of the membrane results in increased operating pressures, increased backwashing frequencies, increased chemical cleaning frequencies, and increased membrane replacement frequencies. The most significant practical implication of membrane fouling is increased operating and maintenance costs. As such, membrane fouling must be properly managed to …

Go to article

Self-Assembled Lipid Tubules: Structures, Mechanical Properties, And Applications., Yue Zhao Jan 2007

Self-Assembled Lipid Tubules: Structures, Mechanical Properties, And Applications., Yue Zhao

Electronic Theses and Dissertations

Self-assembled lipid tubules are particularly attractive for inorganic synthesis and drug delivery because they have hollow cylindrical shapes and relatively rigid mechanical properties. In this thesis work, we have synthesized lipid tubules of 1,2-bis(tricosa-10,12-dinoyl)-sn-glycero-3-phosphocholine (DC8,9PC) by self-assembly and polymerization in solutions. We demonstrate for the first time that both uniform and modulated molecular tilt orderings exist in the tubule walls, which have been predicted by current theories, and therefore provide valuable supporting evidences for self-assembly mechanisms of chiral molecules. Two novel methods are developed for studying the axial and radial deformations of DC8,9PC lipid tubules. Mechanical properties of DC8,9PC tubules …

Go to article

Comparison Of Thm Formation During Disinfection: Ferrate Versus Free Chlorine For Different Source Waters, Adhem Mukattash Jan 2007

Comparison Of Thm Formation During Disinfection: Ferrate Versus Free Chlorine For Different Source Waters, Adhem Mukattash

Electronic Theses and Dissertations

The objective of the study was to compare the trihalomethanes (THMs) produced from ferrate with hypochlorite and to determine how different the THM production would be for a given degree of disinfection (3 log reduction in Heterotrophic Plate Count (HPC)). Different water samples were collected from Lake Claire, Atlantic Ocean, and secondary effluent from an advanced wastewater treatment plant. THM formation was determined using a standard assay over 7 days at room temperature. In addition samples were tested for Total Coliform Escherichia coli (TC/E.coli), and heterotrophic bacteria using HPC by spreadplating on R2A agar. Dissolved organic carbon (DOC) was measured …

Go to article

Microwave Synthesis Of Nanocrystalline Hydroxy Apatite And Comparison Of Its Biomechanical Properties With Tio2 Structures, Saurabh Verma Jan 2007

Microwave Synthesis Of Nanocrystalline Hydroxy Apatite And Comparison Of Its Biomechanical Properties With Tio2 Structures, Saurabh Verma

Electronic Theses and Dissertations

Nanocrystalline hydroxyapatite (HAp) powder of size 10-20 nm was synthesized applying microwave radiation using calcium nitrate tetrahydrate and sodium phosphate dibasic anhydrous as the starting materials. Microwave power of 600 W and Ca/P ratio of 1.66 in the starting chemicals served as the major factors in the synthesis of nanocrystalline HAp powder. Phase composition and evolution were studied using X-ray diffraction (XRD) technique. Morphology, agglomeration and particle-size of the synthesized powder were studied using Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) techniques. Energy Dispersive Spectrum (EDS) was used to determine the elemental composition of the powder. Thermal properties …

Go to article

A Neat Approach To Genetic Programming, Adelein Rodriguez Jan 2007

A Neat Approach To Genetic Programming, Adelein Rodriguez

Electronic Theses and Dissertations

The evolution of explicitly represented topologies such as graphs involves devising methods for mutating, comparing and combining structures in meaningful ways and identifying and maintaining the necessary topological diversity. Research has been conducted in the area of the evolution of trees in genetic programming and of neural networks and some of these problems have been addressed independently by the different research communities. In the domain of neural networks, NEAT (Neuroevolution of Augmenting Topologies) has shown to be a successful method for evolving increasingly complex networks. This system's success is based on three interrelated elements: speciation, marking of historical information in …

Go to article

Reversion Of Poly-Phosphates To Ortho-Phosphates In Water Distribution Systems, Avinash Shekhar Jan 2007

Reversion Of Poly-Phosphates To Ortho-Phosphates In Water Distribution Systems, Avinash Shekhar

Electronic Theses and Dissertations

Orthophosphates and polyphosphates are rarely present at significant levels in raw water source but are purposefully added to the water in various forms to inhibit corrosion, iron oxidation (red water), or calcium carbonate precipitation (scale formation). Orthophosphates serve as building blocks for polyphosphates, which includes structures in linear chain, branched chains (metaphosphate) and "glassy" polyphosphate polymers. The advantage of polyphosphates over ortho phosphates lies in the fact that they slowly revert to orthophosphates and thus provide corrosion inhibition action over longer period of time in distribution systems. A study was completed for Tampa Bay Water on water distribution systems in …

Go to article

Temperature Inside The Landfill: Effects Of Liquid Injection And Ambient Temperature, Amit Kumar Jan 2007

Temperature Inside The Landfill: Effects Of Liquid Injection And Ambient Temperature, Amit Kumar

Electronic Theses and Dissertations

This study represents an analysis of comprehensive temperature and moisture content data collected from the anaerobic portion of a bioreactor landfill at the New River Regional Landfill, Florida, USA. The main focus of the study was the analysis of effects of the liquid injection on the temperature inside the landfill. When the leachate or groundwater at lower temperature than the landfilled waste is injected into the landfill, it has an initial cooling effect on the waste until the biological activity, enhanced by the additional moisture, releases heat. This cooling effect was tested in the study to determine whether it could …

Go to article

Using Electrochemical Monitoring To Predict Metal Release In Drinking Water Distribution Systems, Rajendra D. Vaidya Jan 2007

Using Electrochemical Monitoring To Predict Metal Release In Drinking Water Distribution Systems, Rajendra D. Vaidya

Electronic Theses and Dissertations

Corrosion of distribution system piping and home plumbing materials is a major concern in the water community. Iron release adverse affects aesthetic water quality and the release of copper and lead is regulated by the Lead and Copper rule (LCR) and can adversely affect consumer health. Corrosion control is typically done by pH regulation and/or addition of corrosion inhibitors. Monitoring of corrosion control is typically done after the fact by monitoring metal release, functional group concentration of the selected chemical species or water quality. Hence, the associated laboratory analyses create a significant delay prior to the assessment of corrosion in …

Go to article

Novel Sigma Receptor Agonists Produce Antidepressant-Like Effects In Mice / By Jiajia Wang, Jiajia Wang Jan 2007

Novel Sigma Receptor Agonists Produce Antidepressant-Like Effects In Mice / By Jiajia Wang, Jiajia Wang

Electronic Theses and Dissertations

No abstract provided.

Go to article

First Prev Next Last