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Water Quality Dynamics Of Lake James In The Catawba River Basin Of North Carolina, Susan Stokes Dec 2007

Water Quality Dynamics Of Lake James In The Catawba River Basin Of North Carolina, Susan Stokes

All Dissertations

Lake James is the uppermost hydropower reservoir in the Catawba River drainage in North Carolina. The Lake James Assessment (LJA) was a descriptive study initiated between Clemson University and Duke Energy Corporation to explore the physical, chemical and biological dynamics of this oligotrophic reservoir from spring 1997 through fall 1999 (Schindler 1997). The goals of this study were to ascertain the primary drivers for the chemical dynamics of Lake James, to assess the quantities of constituents entering and leaving the reservoir, where these chemicals were incorporated within the reservoir basins, and to evaluate the efficacy of the LJA chemical budget …

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Studies Of The Stability And Potential Applications Of Pyrrolidinofullerenes And Other Fullerene Derivatives, Olena Lukoyanova Dec 2007

Studies Of The Stability And Potential Applications Of Pyrrolidinofullerenes And Other Fullerene Derivatives, Olena Lukoyanova

All Dissertations

Over the last decade, the variety of chemically modified fullerenes and their potential applications has increased significantly. Among fullerene derivatives, pyrrolidinofullerenes are one of the most widely synthesized types since they can be easily and efficiently obtained via simple reactions from both empty and endohedral fullerenes. Although fullerenes in general and pyrrolidinofullerenes in particular have been considered for numerous applications in electronic and optoelectronic devices, photovoltaics, medicinal chemistry, etc., their potential application in the evolving field of molecular electronics has not been extensively explored. The envisioned role of the fullerenes usually involves storage or transport of electrons. Therefore, studies of …

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Issues In Model Selection, Minimax Estimation, And Censored Data Analysis, Meng Zhao Dec 2007

Issues In Model Selection, Minimax Estimation, And Censored Data Analysis, Meng Zhao

All Dissertations

In this dissertation, we address several research problems in statistical inference. We obtain results in the following four directions: linear model selection, minimax estimation of linear functionals, Bayes type estimators for the survival functions based on right censored data, and estimation of survival functions based on doubly censored data.

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Diversity And Abundance Of Ants At Forest Edges , Eric Paysen Dec 2007

Diversity And Abundance Of Ants At Forest Edges , Eric Paysen

All Dissertations

Fragmented habitats are a common result of human activities that involve the clearing of native vegetation for various land uses. Habitat fragmentation has two primary and inseparable components: habitat loss and insularization. Landscape-level connectivity in fragmented habitats is diminished for many species, and edge characteristics become more important as the edge-to-interior ratio increases. The study of the effects of edges on biodiversity has compelled ecologists to study them for over a century and has influenced the design and management of natural preserves. Invasion of habitats by non-native species is a phenomenon that coincides with the increased human activity typical of …

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Influence Of Mercury-Dissolved Organic Matter (Dom) Complexation On Toxicity In Natural Waters, Christina Mcnaughton Dec 2007

Influence Of Mercury-Dissolved Organic Matter (Dom) Complexation On Toxicity In Natural Waters, Christina Mcnaughton

All Dissertations

Global industrialization, coupled with a large biogeochemical cycle that moves mercury through the environment, has resulted in higher mercury concentrations being detected in many environmental compartments. Although the presence of mercury in each compartment has the potential to elicit toxicity, mercury found in natural waters provides the greatest risk, due to the various reactions it can undergo, resulting in a plethora of different species.
Due to the fact that mercury contamination in aquatic systems has the potential to bioaccumulate and biomagnify up the food chain and cause toxicity, understanding the behavior of mercury in these systems is imperative in the …

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Figuring The Digital, Molly Morin Dec 2007

Figuring The Digital, Molly Morin

All Theses

This body of work is a way of understanding, reflecting on, and contributing to a contemporary dialogue about the impact of digital technology and the Internet on society by looking at the organization of information that lies behind the computer screen, and creating work that is sourced directly from the Internet but becomes a tangible object in the physical world. I use methods of mass production and marketing to create artwork that values individuality over homogenization and complexity over efficiency, co-opting practical digital technology for the purposes of physical beauty. The work should inspire a sense of wonder through its …

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Charge Effects In Bilayer Electric Transport, Christopher Czech Dec 2007

Charge Effects In Bilayer Electric Transport, Christopher Czech

All Theses

The mathematical isomorphism between the layer index in a bilayer system and the spin index in a spin-polarized system is used to draw an analogy between phenomena that occur in the two systems as a result of the electron-electron (e-e) interaction. First, the classical case of the Coulomb drag, a phenomenon resulting from momentum transfer through e-e collisions, is reviewed for both bilayer systems and spin-polarized systems. Then, the spin-backflow phenomenon, a result of the interaction-induced changes in the local quasiparticle energy that affects the charge transport in spin-polarized systems is presented. Finally, the iso-spin correlation is exploited to establish …

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Constraints On An Optical Afterglow And On Supernova Light Following The Short Burst Grb 050813, P. Ferreo, S. F. Sanchez, D. A. Kann, S. Klose, J. Greiner, J. Gorosabel, Dieter H. Hartmann, A. A. Henden, P. Møller, E. Palazzi Dec 2007

Constraints On An Optical Afterglow And On Supernova Light Following The Short Burst Grb 050813, P. Ferreo, S. F. Sanchez, D. A. Kann, S. Klose, J. Greiner, J. Gorosabel, Dieter H. Hartmann, A. A. Henden, P. Møller, E. Palazzi

Publications

We report early follow-up observations of the error box of the short burst GRB 050813 using the telescopes at Calar Alto and Observatorio Sierra Nevada, followed by deep VLT FORS2 I-band observations obtained under very good seeing conditions 5.7 and 11.7 days after the event. Neither a fading afterglow nor a rising SN component was found, so the potential GRB host galaxy has not been identified based on a comparison of the two VLT images taken at different epochs. We discuss whether any of the galaxies present in the original 1000 XRTerror circle could be the host.In anycase, the optical …

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Spin Density Wave Phases In Semiconductor Superlattice, Liqiu Zheng Dec 2007

Spin Density Wave Phases In Semiconductor Superlattice, Liqiu Zheng

All Dissertations

We discuss the existence of spin instabilities and of possible ground states with broken spin symmetry in the presence of a tilted magnetic field for several semiconductor heterostructures. In each instance, the fundamental premise of our study is the existence of a spin degeneracy, controlled by tuning various experimentally controllable parameters, that permits the apparition of spin-flip processes driven entirely by the many-body Coulomb interaction. If in the case of a single quantum well, the spin instabilities trigger an abrupt paramagnetic to ferromagnetic phase transition, we demonstrate that in superlattices, at low temperatures, a stable spin density wave ($SDW$) ground …

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Parental Education Levels And Their Effect On First Year Retention And Grade Point Ratio, Jon Christiansen Dec 2007

Parental Education Levels And Their Effect On First Year Retention And Grade Point Ratio, Jon Christiansen

All Theses

Background/Problem: Education is an important factor in economic success. This research explores how relevant parental education is to their children's education by studying first year college retention as well as first year cumulative grade point ratio. Purpose: By what probability is retention increased on average if a mother or father becomes a high school graduate or a college graduate? Also, by what amount is grade point ratio affected if a mother or father becomes a high school graduate or a college graduate? Design and Methods: A random sample of 844 students who filled out the FAFSA at a southern public …

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An Experiment In Joint Product Price Optimization: Price Elasticities And Substitution Decisions Of The Hungry Barfly, Jeffrey Coursen Dec 2007

An Experiment In Joint Product Price Optimization: Price Elasticities And Substitution Decisions Of The Hungry Barfly, Jeffrey Coursen

All Theses

The subject of optimal pricing is consistently on the forefront of debate among firms in all market situations. Optimal pricing is further complicated when there are common resource inputs associated with the production of a multitude of different products. Economic theory has suggestions for pricing optimally in a variety of market conditions, from perfect competition, to perfect monopoly. This paper presents an experiment where a firm is attempting to optimally price multiple products with common cost inputs subject to monopolistic market conditions. The result supports the hypothesis of substitution amongst the product line relative to prices, as well as presents …

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An Examination Of Colliding Galaxy Clusters: Recreating 1e 0657-56 With Gadget-2, Joseph Johnson Dec 2007

An Examination Of Colliding Galaxy Clusters: Recreating 1e 0657-56 With Gadget-2, Joseph Johnson

All Theses

In this thesis I use the publicly available smooth particle hydrodynamics (SPH) code GADGET-2 to investigate and recreate the phenomenon of two merging galaxy clusters, as currently seen in the hot X-ray cluster 1E 0657-56 (the 'bullet cluster'). In this scenario, the stellar and dark matter components of the galaxies pass through the collision without experiencing strong stopping forces, but the intra-cluster gas is significantly slowed by ram pressure. This leads to a spatial separation between the galaxies and the intra-cluster gas, which provides a testing ground for gravitational theories. Weak gravitational lensing in the cluster has been used to …

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Optimization Of Electrostatic Interactions In Protein-Protein Complexes, Kelly Brock, Kemper Talley, Kacey Coley, Petras Kundrotas, Emil Alexov Nov 2007

Optimization Of Electrostatic Interactions In Protein-Protein Complexes, Kelly Brock, Kemper Talley, Kacey Coley, Petras Kundrotas, Emil Alexov

Publications

In this article, we present a statistical analysis of the electrostatic properties of 298 protein-protein complexes and 356 domain-domain structures extracted from the previously developed database of protein complexes (ProtCom, http://www.ces.clemson.edu/compbio/protcom). For each structure in the dataset we calculated the total electrostatic energy of the binding and its two components, Coulombic and reaction field energy. It was found that in a vast majority of the cases (>90%), the total electrostatic component of the binding energy was unfavorable. At the same time, the Coulombic component of the binding energy was found to favor the complex formation while …

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On Enumeration Of Conjugacy Classes Of Coxeter Elements, Matthew Macauley, Henning S. Mortveit Nov 2007

On Enumeration Of Conjugacy Classes Of Coxeter Elements, Matthew Macauley, Henning S. Mortveit

Publications

In this paper we study the equivalence relation on the set of acyclic orientations of a graph Y that arises through source-to-sink conversions. This source-to-sink conversion encodes, e.g. conjugation of Coxeter elements of a Coxeter group. We give a direct proof of a recursion for the number of equivalence classes of this relation for an arbitrary graph Y using edge deletion and edge contraction of non-bridge edges. We conclude by showing how this result may also be obtained through an evaluation of the Tutte polynomial as T (Y, 1, 0), and we provide bijections to two other classes of acyclic …

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Hip-Hop Developmenttm Bridging The Generational Divide For Youth Development, P. Thandi Hicks Harper, Warren A. Rhodes, Duane E. Thomas, George Leary Oct 2007

Hip-Hop Developmenttm Bridging The Generational Divide For Youth Development, P. Thandi Hicks Harper, Warren A. Rhodes, Duane E. Thomas, George Leary

Journal of Youth Development

Hip-Hop culture in the lives of youth can not be ignored. This research is based on the premise that youth workers who expect ongoing successes must increase their Hip Hop culture competence. The study examined the knowledge of and attitude towards Hip-Hop by educators who participated in a Hip-Hop 101 workshop. Their perceptions relevant to the importance of Hip-Hop awareness and application for positively influencing youth behaviors were also explored. Results revealed that workshop participants significantly increased their Hip-Hop knowledge. They also demonstrated significantly more favorable attitudes toward Hip-Hop and its use for youth development. Findings suggest that the workshop …

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Hip-Hop Developmenttm Bridging The Generational Divide For Youth Development, P. Thandi Hicks Harper, Warren A. Rhodes, Duane E. Thomas, George Leary Oct 2007

Hip-Hop Developmenttm Bridging The Generational Divide For Youth Development, P. Thandi Hicks Harper, Warren A. Rhodes, Duane E. Thomas, George Leary

Journal of Youth Development

Hip-Hop culture in the lives of youth can not be ignored. This research is based on the premise that youth workers who expect ongoing successes must increase their Hip Hop culture competence. The study examined the knowledge of and attitude towards Hip-Hop by educators who participated in a Hip-Hop 101 workshop. Their perceptions relevant to the importance of Hip-Hop awareness and application for positively influencing youth behaviors were also explored. Results revealed that workshop participants significantly increased their Hip-Hop knowledge. They also demonstrated significantly more favorable attitudes toward Hip-Hop and its use for youth development. Findings suggest that the workshop …

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Camp Counseling And The Development And Transfer Of Workforce Skills: The Perspective Of Ohio 4-H Camp Counselor Alumni, Janel K. Digby, Theresa M. Ferrari Oct 2007

Camp Counseling And The Development And Transfer Of Workforce Skills: The Perspective Of Ohio 4-H Camp Counselor Alumni, Janel K. Digby, Theresa M. Ferrari

Journal of Youth Development

Recent research shows that camp counselors, including those in 4-H, benefit from the experience by developing important life skills. However, because research regarding the perception of workforce skill development in this context has yielded inconsistent findings, the present study used focus groups to examine 4-H camp counselor alumni perceptions about the skills gained and transfer of these skills to other settings. Overall, 4-H camp counselor alumni thought their experience was fun and enjoyable, yet challenging. They believed they developed important life and workforce skills. Not only did alumni learn these skills, but the skills transferred beyond the camp setting. Leadership …

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Camp Counseling And The Development And Transfer Of Workforce Skills: The Perspective Of Ohio 4-H Camp Counselor Alumni, Janel K. Digby, Theresa M. Ferrari Oct 2007

Camp Counseling And The Development And Transfer Of Workforce Skills: The Perspective Of Ohio 4-H Camp Counselor Alumni, Janel K. Digby, Theresa M. Ferrari

Journal of Youth Development

Recent research shows that camp counselors, including those in 4-H, benefit from the experience by developing important life skills. However, because research regarding the perception of workforce skill development in this context has yielded inconsistent findings, the present study used focus groups to examine 4-H camp counselor alumni perceptions about the skills gained and transfer of these skills to other settings. Overall, 4-H camp counselor alumni thought their experience was fun and enjoyable, yet challenging. They believed they developed important life and workforce skills. Not only did alumni learn these skills, but the skills transferred beyond the camp setting. Leadership …

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The Tiger Vol. 101 Issue 14 2007-09-14, Clemson University Sep 2007

The Tiger Vol. 101 Issue 14 2007-09-14, Clemson University

Tiger Newspapers

No abstract provided.

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The Tiger Vol. 101 Issue 13 2007-09-07, Clemson University Sep 2007

The Tiger Vol. 101 Issue 13 2007-09-07, Clemson University

Tiger Newspapers

No abstract provided.

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Shibboleth As A Tool For Authorized Access Control To The Subversion Repository System, Amy Apon, Linh B. Ngo Sep 2007

Shibboleth As A Tool For Authorized Access Control To The Subversion Repository System, Amy Apon, Linh B. Ngo

Publications

Shibboleth is an architecture and protocol for allowing users to authenticate and be authorized to use a remote resource by logging into the identity management system that is maintained at their home institution. With Shibboleth, a federation of institutions can share resources among users and yet allow the administration of both the user access control to resources and the user identity and attribute information to be performed at the hosting or home institution. Subversion is a version control repository system that allows the creation of fine-grained permissions to files and directories. In this project an infrastructure, Shibbolized Subversion, has been …

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Shibboleth As A Tool For Authorized Access Control To The Subversion Repository System, Linh B. Ngo, Amy W. Apon Sep 2007

Shibboleth As A Tool For Authorized Access Control To The Subversion Repository System, Linh B. Ngo, Amy W. Apon

Publications

Shibboleth is an architecture and protocol for allowing users to authenticate and be authorized to use a remote resource by logging into the identity management system that is maintained at their home institution. With Shibboleth, a federation of institutions can share resources among users and yet allow the administration of both the user access control to resources and the user identity and attribute information to be performed at the hosting or home institution. Subversion is a version control repository system that allows the creation of fine-grained permissions to files and directories. In this project an infrastructure, Shibbolized Subversion, has been …

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The Tiger Vol. 101 Issue 12 2007-08-31, Clemson University Aug 2007

The Tiger Vol. 101 Issue 12 2007-08-31, Clemson University

Tiger Newspapers

No abstract provided.

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Improving The Performance Of Software Defined Radio By Employing Digital Feedback Of Radio Frequency Properties, Joel Simoneau Aug 2007

Improving The Performance Of Software Defined Radio By Employing Digital Feedback Of Radio Frequency Properties, Joel Simoneau

All Dissertations

This dissertation provides tools for the analysis and integration of the hardware and software components of a software defined radio for optimum radio frequency performance. A device is introduced that is able to give baseband feedback of radio frequency properties suitable for analysis in software. Three applications for the device are devised. The first is an image rejection upconverter that achieves greater than 65 dB of image rejection over a broad frequency range without the use of a radio frequency filter. The second application is a baseband correction scheme for extending the bandwidth and improving the magnitude and phase match …

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Faster Algorithms For Stable Allocation Problems, Siddharth Munshi Aug 2007

Faster Algorithms For Stable Allocation Problems, Siddharth Munshi

All Theses

We consider a high-multiplicity generalization of the classical stable matching problem known as the stable allocation problem, introduced by Baiou and Balinski in 2002. By leveraging new structural properties and sophisticated data structures, we show how to solve this problem in O(mlog n) time on an bipartite instance with n nodes and m edges, improving the best known running time of O(mn). Our approach simplifies the algorithmic landscape for this problem by providing a common generalization of two different approaches from the literature -- the classical Gale-Shapley algorithm, and a recent algorithm of Baiou and Balinski. Building on this algorithm, …

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A Hydraulic Actuated Thermal Management System For Large Displacement Engine Cooling Systems, Peyton Frick Aug 2007

A Hydraulic Actuated Thermal Management System For Large Displacement Engine Cooling Systems, Peyton Frick

All Theses

The performance of automotive cooling systems can be improved by replacing the traditional mechanically driven radiator fan and water pump assemblies with computer controlled components. The introduction of electric servo-motors to drive the cooling components can improve temperature tracking, which should increase fuel efficiency and decrease tailpipe emissions. However, the power requirement for these electric motors increases with greater cooling demands if the radiator surface area remains constrained. For heavy-duty applications, where engines are subjected to significant cooling loads, electric motors may become impractical due to their increased size and power requirements; in these situations, hydraulic-based components are advantageous due …

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The Thermoelectric Properties Investigation Of Ir3Ge7 Typed Representatives, Huqin Zhang Aug 2007

The Thermoelectric Properties Investigation Of Ir3Ge7 Typed Representatives, Huqin Zhang

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Energy conversion is employed to power generation utilizing the Seebeck effect or cooling utilizing the Peltier effect. Herein, we study several Ir3Ge7 typed semiconductor materials for potential thermoelectric energy conversion. Mo3Sb7, crystallizing in Ir3Ge7 type, can be rendered semiconducting by a partial Sb-Te substitution without noticeable structure changes, resulting in Mo3Sb5Te2 with 55 valence electrons per formula unit. Meanwhile, large cubic voids in the Mo3Sb5Te2 crystal structure provide the possibility of filling the voids with small cations to decrease the …

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Home Range And Habitat Use Of Feral Hogs (Sus Scrofa) In Congaree National Park, Bradford Friebel Aug 2007

Home Range And Habitat Use Of Feral Hogs (Sus Scrofa) In Congaree National Park, Bradford Friebel

All Theses

ABSTRACT One of the most destructive exotic wildlife species in the southeastern U.S. is the feral hog (Sus scrofa). To learn more about feral hog movement patterns and habitat use, hogs were radio-collared and tracked from April 2005 to November 2006 in Congaree National Park (CNP). Seven male and nine female hogs were monitored and their home ranges averaged 218.2 ± 42.9 ha and 194.1 ± 31.0 ha, respectively. These home ranges proved relatively small when compared to results from other analyses of home range size in feral hogs, and suggest an abundant resource base in CNP. Habitat use was …

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Comparison Between Steady State And Laser Flash Techniques, Justine Andrews Aug 2007

Comparison Between Steady State And Laser Flash Techniques, Justine Andrews

All Theses

Thermoelectrics is a promising avenue of energy conservation. A material is deemed a good thermoelectric material when it portrays certain material characteristics. These characteristics include a high thermopower and electrical conductivity and a low thermal conductivity. This thesis focuses on the methods of measuring a material's thermal conductivity.
The steady state method is a measurement technique used in the low temperature thermal conductivity measurements. This technique assures that the system and sample are at equilibrium before a measurement point is taken. As a result the measurements are both precise and accurate.
The laser flash technique measures a sample's thermal conductivity …

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Examination Of The Allee Effect On Postlarval Recruitment And Post Settlement Survival In The Caribbean Spiny Lobster Panulirus Argus, Adrianna Zito Aug 2007

Examination Of The Allee Effect On Postlarval Recruitment And Post Settlement Survival In The Caribbean Spiny Lobster Panulirus Argus, Adrianna Zito

All Theses

Positive density dependence (the Allee effect) has been reported in a number of species that are attracted to conspecific cues. This effect has been shown to influence the settlement of many species of marine invertebrates. Caribbean spiny lobsters are gregarious den dwellers attracted to conspecific cues. Previous studies have suggested that the benefit of conspecific attraction is a reduced predation risk by decreasing the time to find crevice shelters (the guide effect) or by cooperative group defense once sharing shelters. I tested a third hypothesis that attraction to conspecific cues increases the settlement of lobster postlarvae into the highest quality …

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