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Comparison Of Thermoelectric Properties Of Arc-Melted And Hot-Pressed Half-Heuslers, Brad Edwards Aug 2007

Comparison Of Thermoelectric Properties Of Arc-Melted And Hot-Pressed Half-Heuslers, Brad Edwards

All Theses

Relatively low thermal conductivity and great electrical properties in combination with wide tuning parameters through doping make half-Heuslers high potential thermoelectric materials. In this study we plan to investigate the effects of hot-pressing and arc-melting on the thermoelectric properties of ZrNiSn0.975Sb0.025, and Hf0.75Zr0.25NiSn0.975Sb0.025 samples. Also, the effects of electron and phonon scattering due to the insertion of small 50 nm particles within the sample were investigated in ZrNiSn0.975Sb0.025 +4% Al2O3 and Hf0.75Zr0.25NiSn0.975Sb0.025 +4% Al2O …

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Steer It And Clear It: Effectiveness Of Quick Clearance Legislation, Amy Carol Hamlin Aug 2007

Steer It And Clear It: Effectiveness Of Quick Clearance Legislation, Amy Carol Hamlin

All Theses

Innovative incident management strategies have been sought by transportation professionals to minimize the impacts of incidents on traffic operation and safety. Some current quick clearance strategies such as 'Steer It and Clear It' legislation in South Carolina, which requires driver(s) of involved vehicle(s) in a minor incident to move vehicles promptly from the traveled roadway prior to the arrival of the first responders, can potentially reduce the duration of an incident. The research detailed in this paper endeavored to measure the benefit of the Steer It and Clear It law on a section of I-85 in South Carolina. A simulation …

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Registration Using Graphics Processor Unit, Koushik Aravalli Aug 2007

Registration Using Graphics Processor Unit, Koushik Aravalli

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Data point set registration is an important operation in coordinate metrology. Registration is the operation by which sampled point clouds are aligned with a CAD model by a 4X4 homogeneous transformation (e.g., rotation and translation). This alignment permits validation of the produced artifact's geometry. State-of-the-art metrology systems are now capable of generating thousands, if not millions, of data points during an inspection operation, resulting in increased computational power to fully utilize these larger data sets. The registration process is an iterative nonlinear optimization operation having an execution time directly related to the number of points processed and CAD model complexity. …

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Automorphic Decompositions Of Graphs, Robert Beeler Aug 2007

Automorphic Decompositions Of Graphs, Robert Beeler

All Dissertations

Let G and H be graphs. A G-decomposition D of a graph H is a partition of the edge set of H such that the subgraph induced by the edges in each part of the partition is isomorphic to G. It is well known that a graceful labelling (or more generally a rho-valuation) of a graph G induces a cyclic G-decomposition of a complete graph. We will extend these notions to that of a general valuation in a cyclic group. Such valuations yield decompositions of circulant graphs. We will show that every graph has a valuation and hence is a …

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Wind Effects On Monosloped And Sawtooth Roofs, Bo Cui Aug 2007

Wind Effects On Monosloped And Sawtooth Roofs, Bo Cui

All Dissertations

Wind is one of the significant forces of nature that must be considered in the design of buildings. The actual behavior of wind is influenced not only by the surface (or boundary-layer) conditions, but also by the geometry of the building. All sorts of turbulent effects occur, especially at building corners, edges, roof eaves. Some of these effects are accounted for by the wind pressure coefficient. Wind pressure coefficients used in practice have usually been obtained from experimentally by testing models of different type of structures in wind tunnels.
In this study, a series of wind tunnel tests with scale …

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Clemson Commencement Program, August 2007, Clemson University Aug 2007

Clemson Commencement Program, August 2007, Clemson University

Clemson Commencement Programs

No abstract provided.

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Helping Schools: Youth Development As A Form Of Supplemental Education, Jan Carroll, Jeff Goodwin, Melissa Oliver Aug 2007

Helping Schools: Youth Development As A Form Of Supplemental Education, Jan Carroll, Jeff Goodwin, Melissa Oliver

Journal of Youth Development

This study measured the impact of 4-H Youth Development on Colorado’s youth. Active youth were compared to those who did not participate in out-of-school activities. Data were collected from 5th, 7th, and 9th grade students. Results of the study confirm active students, including 4-H Youth Development members, were less likely to engage in at-risk behaviors. 4-H Youth Development can function as a form of supplemental education, contributing to academic, civic, and social success of young people.

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Everything Stems From Nothing, Daniel Theis Aug 2007

Everything Stems From Nothing, Daniel Theis

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In sixteenth century Europe, mathematics was undergoing a transformation. Prominently among these changes were the switch from roman numerals to arabic numerals and the implementation of the number zero. The number zero has two main functions: to stand on its own as a symbol of nothing and to function as a placeholder. Thus, zero can be a symbol of nothing as well as a number that dramatically increases the value of the others. The dual roles of zero led to much confusion in early modern people. Shakespeare uses the different roles of zero in his plays Richard III, Hamlet, and …

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Feeding Performance In Hawaiian Stream Goby Fishes: Morphological And Functional Analysis, Takashi Maie Aug 2007

Feeding Performance In Hawaiian Stream Goby Fishes: Morphological And Functional Analysis, Takashi Maie

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Distributions of Hawaiian stream fishes are typically interrupted by waterfalls that divide streams into lower and upper segments. Larvae hatched upstream are flushed into the ocean, and must climb these waterfalls to reach adult habitats when returning back to freshwater as part of an amphidromous life cycle. Stream surveys and studies of climbing performance show that Lentipes concolor can reach fast-flowing upper stream segments, but that Awaous guamensis reaches only slower, lower stream segments. Gut content analyses for these two species indicate that diet differs between them only by 10% or less dry weight for most major components (mostly green …

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An Efficient Asynchronous Peer To Peer Auction Using Yao Oblivious Transfer, Charles Lobo Aug 2007

An Efficient Asynchronous Peer To Peer Auction Using Yao Oblivious Transfer, Charles Lobo

All Theses

Distributed electronic auctions are increasingly preferred over centralized electronic auctions today. The success of peer-to-peer file sharing networks has made distributed electronic auctions a possibility. Due to trust and conflict of interest issues with centralized auctioneer systems, multiple auctioneers in distributed roles are preferred. However, there is a possibility of auctioneer node collusion [16] and auctioneer-bidder collusion and auctioneer-seller collusion in such mechanisms.
To overcome these problems, a new peer-to-peer auction protocol [17] with auctioneers forming auctioneer groups has been proposed. This protocol keeps the auctioneers honest by ensuring that no single auctioneer in the group has absolute control over …

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Performance Of Voip Services On A Docsis Network Targeted By A Denial Of Service Attack, Benjamin Sangster Aug 2007

Performance Of Voip Services On A Docsis Network Targeted By A Denial Of Service Attack, Benjamin Sangster

All Theses

Over 48 million end users worldwide utilize cable modems as their means of accessing the Internet at high speeds. The United States accounts for 54% of those users. Networks which provide access via cable modems utilize Data Over Cable Service Interface Specifications (DOCSIS) as their means of network management. As availability to the Internet increases (especially at high speeds supported by broadband access), so does the opportunity for malicious activity against users utilizing the Internet. Denial-of-service (DoS) attacks are one form of malicious activity and one of the most common. In commonplace Ethernet-based wired networks, a DoS attack requires relatively …

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A Comparative Study On Ontology Generation And Text Clustering Using Vsm, Lsi, And Document Ontology Models, William Taylor Aug 2007

A Comparative Study On Ontology Generation And Text Clustering Using Vsm, Lsi, And Document Ontology Models, William Taylor

All Theses

Although using ontologies to assist information retrieval and text document processing has recently attracted more and more attention, existing ontology-based approaches have not shown advantages over the traditional keywords-based Latent Semantic Indexing (LSI) method. This paper proposes an algorithm to extract a concept forest (CF) from a document with the assistance of a natural language ontology, the WordNet lexical database. Using concept forests to represent the semantics of text documents, the semantic similarities of these documents are then measured as the commonalities of their concept forests. Performance studies of text document clustering based on different document similarity measurement methods show …

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Topology-Aware Transmission Scheduling For Distributed Highway Traffic Monitoring Wireless Sensor Networks, Devang Bagaria Aug 2007

Topology-Aware Transmission Scheduling For Distributed Highway Traffic Monitoring Wireless Sensor Networks, Devang Bagaria

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Wireless sensor networks have been deployed along highways for traffic monitoring. The thesis studies a set of transmission scheduling methods for optimizing network throughput, message transfer delay, and energy efficiency. Today's traffic monitoring systems are centrally managed. Several studies have envisioned the advantages of distributed traffic management techniques. The thesis is based on previously proposed hierarchical sensor network architecture, for which the routing and transmission scheduling methods are derived.
Wireless sensor networks have a lifetime limited by battery energy of the sensors. The thesis proposes to assign schedules for nodes to transmit and receive packets and turning off their radios …

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Advanced Thermal Management For Internal Combustion Engines, Thomas Mitchell Aug 2007

Advanced Thermal Management For Internal Combustion Engines, Thomas Mitchell

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The automotive cooling system has unrealized potential to improve internal combustion engine performance through enhanced coolant temperature control and reduced parasitic losses. Advanced automotive thermal management systems use controllable actuators (e.g., smart thermostat valve, variable speed water pump, and electric radiator fan) in place of conventional mechanical cooling system components to improve engine temperature tracking over most operating ranges. To optimize advanced cooling system performance, the electro-mechanical actuators must work in harmony to control engine temperature. The design and placement of cooling components should also be considered when attempting to maximize the performance.
In this research project, two distinct vehicle …

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Carbon Nanomaterials In Biological Systems, Sijie Lin Aug 2007

Carbon Nanomaterials In Biological Systems, Sijie Lin

All Theses

ABSTRACT


This thesis intends to present, from the biophysical viewpoint, my study on understanding carbon nanomaterials in biological and environmental systems. Carbon nanotubes and fullerenes represent a major family of carbon nanoparticles which possess distinct electrical, optical and mechanical properties. However, the major hurdle for making carbon nanomaterials bioavailable lies in their tendency toward bundling, driven by hydrophobic interaction, van der Waals force, and pi-stacking. To overcome this problem, we used non-covalent binding of zwitterionic lysophopholipids (LPL) onto the external surfaces of single-walled carbon nanotubes (SWNTs). This method affords superior SWNT solubility in aqueous solution. The stability of SWNT-LPL complex …

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Responses Of Problematic Cyanobacteria To Exposures Of Copper Containing Algaecides, O'Niell Tedrow Aug 2007

Responses Of Problematic Cyanobacteria To Exposures Of Copper Containing Algaecides, O'Niell Tedrow

All Theses

Cyanobacteria (blue-green algae) are associated with production of potent hepatotoxins (Microcystis; microcystin) and dense surface and benthic mats (Lyngbya), which impede critical water resource usages. Water resource managers are in need of effective and efficient treatment techniques for these problematic algae in field situations. Applications of algaecides are considered in situations where algal problems become acute or when critical water usages are threatened. However, laboratory data are needed that accurately predict responses of algae prior to field-scale algaecide applications. Site water and algae were used in laboratory algal toxicity experiments to predict responses of the target alga following an algaecide …

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Bioanalyze: A Tool For The Simulation And Analysis Of Biological Systems, James Norman Aug 2007

Bioanalyze: A Tool For The Simulation And Analysis Of Biological Systems, James Norman

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Scientists have turned to a more systemic approach to biology in order to fully understand the complex functionality of living organisms. Biologist and Geneticist have compiled an impressive amount of experimental data for a multitude of biological systems. Modeling and simulation of these systems has become a prominent tool in the field of Systems Biology. In this paper we present a review of General Systems Theory, Systems Biology, and introduce BioAnalyze. BioAnalyze is a web application designed to simulate, and analyze, the functional dynamics of biological systems.

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Nonlinear Modeling Of The Adsorption-Induced Surface Stress In Piezoelectrically-Driven Microcantilever Biosensors, Mana Afshari Aug 2007

Nonlinear Modeling Of The Adsorption-Induced Surface Stress In Piezoelectrically-Driven Microcantilever Biosensors, Mana Afshari

All Theses

Microcantilever-based biosensors are rapidly becoming an enabling sensing technology for a variety of label-free biological applications due to their extreme applicability, versatility and low cost. These sensors operate through the adsorption of species on the functionalized surface of microcantilevers. The adsorption of biological species induces surface stress which originates from the molecular interactions such as adhesion forces of attraction/repulsion, electrostatic forces or the surface charge redistribution of the underlying substrate. This surface stress, consequently, alters the resonance frequency of the microcantilever beam.
This study presents a general framework towards modeling resonance frequency changes induced due to the surface stress arising …

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A Study Of Estimation Techniques And Of Mechatronic System Design And Testing, Brett Castelloe Aug 2007

A Study Of Estimation Techniques And Of Mechatronic System Design And Testing, Brett Castelloe

All Theses

This thesis is a collection of two projects that the author worked on during his master's studies at Clemson University. The first project--adaptive camera calibration--involves the design and simulation of an estimator for the calibration parameters of a camera. The second project--basket drive wear testing--includes the design of a test plan for measuring wear on a mechatronic system.

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A Comparison Of Class Diagram Construction At Three Different Phases Of Compilation, Robert Bailey Iii Aug 2007

A Comparison Of Class Diagram Construction At Three Different Phases Of Compilation, Robert Bailey Iii

All Theses

In maintaining, designing, and testing of OO systems, understanding the relationships between the classes and corresponding objects is imperative. Class diagrams provide program visualization that promotes easier understanding of large systems. Class diagrams are especially helpful when systems become too large to conceptualize without automated graphical illustration. There are many tools available to software developers that permit generation of class diagrams for large scale computing applications, many of which use various parsing approaches to extract information for a class diagram. In this paper, we compare and evaluate three tools that extract information for class diagrams from different phases of the …

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Transmission Gate Based Dual Rail Logic For Differential Power Analysis Resistant Circuits, Srinidhi Narasimha Char Aug 2007

Transmission Gate Based Dual Rail Logic For Differential Power Analysis Resistant Circuits, Srinidhi Narasimha Char

All Theses

Cryptographic devices with hardware implementation of the algorithms are increasingly being used in various applications. As a consequence, there is an increased need for security against the attacks on the cryptographic system. Among various attack techniques, side channel attacks pose a significant threat to the hardware implementation. Power analysis attacks are a type of side channel attack where the power leakage from the underlying hardware is used to eavesdrop on the hardware operation. Wave pipelined differential and dynamic logic (WDDL) has been found to be an effective countermeasure to power analysis. This thesis studies the use of transmission gate based …

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Almond Skins As A Natural Antioxidant, Heather Johnson Aug 2007

Almond Skins As A Natural Antioxidant, Heather Johnson

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In this thesis, the potential for almond skins in their native state as a natural antioxidant in foods was explored. A literature review of general information on almonds, research done on almond skins, and general information on antioxidants is presented. The almond skins used in this study required an additional heat treatment step to improve their microbiological quality before further treatments and analysis could be performed. A descriptive analysis sensory panel was utilized to identify potential flavor and aroma descriptors and their intensities. The aroma descriptors identified were toasted, bran, and toasted; nutty. The flavor descriptors identified were toasted, bran, …

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A Proposed Character Animation Workflow For Digital Production Arts With Preparation For Cloth Dynamics, Kent Chan Aug 2007

A Proposed Character Animation Workflow For Digital Production Arts With Preparation For Cloth Dynamics, Kent Chan

All Theses

In a fast-paced production studio, procedures and standard operating practices have been created to ensure maximum use of resources, while being flexible enough to account for problems that might arise. For the animation section of the pipeline, it is imperative to produce animation in a timely manner so that the other sections of the pipeline that are dependent on animation can begin at an appropriate time. Using 'Mileena Malign' and 'SpaceCat' as case studies, a possible workflow for computer animation--specifically as it pertains to preparation for cloth dynamics--is developed, with highlights on the advantages and challenges encountered. This thesis presents …

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Standardized Power: A Rhetoric Of Performance Evaluation In Education, Michael Hedges Aug 2007

Standardized Power: A Rhetoric Of Performance Evaluation In Education, Michael Hedges

All Theses

South Carolina's public education system administrators and teachers need to know more about how the language used in written performance evaluations impacts the effectiveness of evaluation feedback in order to help improve the state's system for Assisting, Developing, and Evaluating Professional Teaching (ADEPT). One key to understanding this knowledge is identifying the characteristics of the language used in evaluation feedback. This study examines the rhetorical situation of written performance evaluations from a theoretical standpoint and used a survey to assess several characteristics of the language used in evaluation feedback (word usage, content inclusion, and the structural order of sentences). Results, …

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Analyzing Relationships Between Lightning And Rain In Order To Improve Estimation Accuracy Of Rain , Justin Lapp Aug 2007

Analyzing Relationships Between Lightning And Rain In Order To Improve Estimation Accuracy Of Rain , Justin Lapp

All Theses

The remote estimation of rainfall rate R is essential for the aviation industry, agriculture, and food warning. Radar, the current means of R estimation, is not available in much of the world. In addition, this measurement involves a level of inaccuracy. Using lightning to detect rain is a relatively inexpensive alternative to radar systems and can be done from existing satellites. Previous research has revealed correlations between lightning and rain, suggesting either that it is possible to estimate R using lightning, or that it is possible to use it to correct for a portion of the radar inaccuracies. These correlations …

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Pursuit-Evasion With Acceleration, Sensing Limitation, And Electronic Counter Measures, Jing-En Pang Aug 2007

Pursuit-Evasion With Acceleration, Sensing Limitation, And Electronic Counter Measures, Jing-En Pang

All Theses

Abstract: The use of game theory to analyze the optimal behaviors of both pursuers and evaders originated with Isaac's work at the Rand Corporation in the 1950's. Although many variations of this problem have been considered, published work to date is limited to the case where both players have constant velocities. In this thesis, we extend previous work by allowing players to accelerate. Analysis of this new problem using Newton's laws imposes an additional constraint to the system, which is the relationship between players' velocities and allowed turning radius. We find that analysis of this relationship provides new insight into …

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Critical Thinking Traits Of Top-Tier Experts And Implications For Computer Science Education, Dean Bushey Aug 2007

Critical Thinking Traits Of Top-Tier Experts And Implications For Computer Science Education, Dean Bushey

All Dissertations

A documented shortage of technical leadership and top-tier performers in
computer science jeopardizes the technological edge, security, and economic well-being of the nation. The 2005 President's Information and Technology Advisory Committee (PITAC) Report on competitiveness in computational sciences highlights the major impact of science, technology, and innovation in keeping America competitive in the global marketplace. It stresses the fact that the supply of science, technology, and engineering experts is at the core
of America's technological edge, national competitiveness and security. However, recent data shows that both undergraduate and postgraduate production of computer scientists is falling.

Past research on expert performance …

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Estimates Related To The Arithmetic Of Elliptic Curves, Bryan Faulkner Aug 2007

Estimates Related To The Arithmetic Of Elliptic Curves, Bryan Faulkner

All Dissertations

This dissertation presents results related to two problems in the arithmetic of elliptic curves.
Feng and Xiong equate the nontriviality of the Selmer groups associated with congruent number curves to the presence of certain types of partitions of graphs associated with the prime factorization of n. The triviality of the Selmer groups associated to the congruent number curve implies that the curve has rank zero which in turn implies n is noncongruent. We extend the ideas of Feng and Xiong in order to compute the Selmer groups of congruent number curves.
We prove an average version of a generalization of …

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Control Of Nonlinear Mechatronic Systems, Enver Tatlicioglu Aug 2007

Control Of Nonlinear Mechatronic Systems, Enver Tatlicioglu

All Dissertations

This dissertation is divided into four self-contained chapters. In Chapter 1, an adaptive nonlinear tracking controller for kinematically redundant robot manipulators is presented. Past research efforts have focused on the end-effector tracking control of redundant robots because of their increased dexterity over their non-redundant counterparts. This work utilizes an adaptive full-state feedback quaternion based controller developed in [1] and focuses on the design of a general sub-task controller. This sub-task controller does not affect the position and orientation tracking control objectives, but instead projects a preference on the configuration of the manipulator based on sub-task objectives such as the following: …

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Post-Production Separation And Functionalization Of Single-Walled Carbon Nanotubes, Kurukulasuriya Fernando Aug 2007

Post-Production Separation And Functionalization Of Single-Walled Carbon Nanotubes, Kurukulasuriya Fernando

All Dissertations

ABSTRACT
Single-walled carbon nanotubes (SWNTs) are considered to have many potential applications due to their unique structural, physical, chemical and electronic properties. Because the rigid structure of carbon nanotube determines its toughness in dissolution, the processing capability of carbon nanotube is strongly limited. My carbon nanotube functionalization research was mainly focused on developing innovative methods to functionalize nanotubes with various polymers and large aromatic molecules to make them soluble to study their interesting properties and applications. In this dissertation, different methods for the functionalization and solubilization of carbon nanotubes are described. The co-existence of metallic and semiconducting carbon nanotubes has …

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