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Articles 3991 - 4020 of 6182
Full-Text Articles in Entire DC Network
Molecular Characterization Of Enrichment Cultures That Grow On Tetrachloroethene, 1,2 Dichloroethane And Ethylene Dibromide, Hari Shankar Peethambaram
Molecular Characterization Of Enrichment Cultures That Grow On Tetrachloroethene, 1,2 Dichloroethane And Ethylene Dibromide, Hari Shankar Peethambaram
All Theses
Halogenated aliphatic hydrocarbons are among the most common contaminants in soil and groundwater found at hazardous waste sites throughout the United States. Among them are tetrachloroethene (PCE), 1,2-dichloroethane (1,2-DCA) and ethylene dibromide (EDB). Organohalide respiration of each compound has been reported. However, considerably less information is known about EDB than PCE and 1,2-DCA, including the yield that occurs during growth with EDB as the sole TEA. The main objective of this project was to determine which types of chlororespiring microbes predominate during growth of enrichment cultures when PCE, 1,2-DCA and EDB served as the TEA, and what their yield is. …
Style And Electronic Communication: The Accommodation Of Scientific Risks In The Sierra Magazine, Erin Dalton
Style And Electronic Communication: The Accommodation Of Scientific Risks In The Sierra Magazine, Erin Dalton
All Theses
This thesis focuses on how style accommodates scientific risks for public audiences in Magazine articles. Language has previously been unexplored in risk communication; in accommodation research, style has not been investigated. Responding to these gaps in research, this study combines two unexplored dimensions--risk communication and accommodation--to show how syntax, diction, and metaphor resituate technical language and ideas in scientific risk studies for readers. First, interviews with editors and writers will provide a rich understanding of how their editing and composition practices influence accommodation processes. From there, an electronic communication analysis will illustrate how this medium can accommodate beyond text to …
Creatures Of Habit, Jennifer Miller
Creatures Of Habit, Jennifer Miller
All Theses
My work reflects my interests in drawing, illustration, science, and culture. Being born and raised in desert suburbia, my environment consisted of small middle class homes in a grid of roads and sidewalks, punctuated by small pockets of natural landscape. However, as I watched then, and as I still see now, many of the things I have come to love and appreciate about this environment are disappearing before my eyes. As people's values change, so does the natural and unnatural landscape. The natural things are replaced with our own excess, everything needing to be larger, louder and flashier, all so …
Development Of A Carbohydrate Microarray System And A Microcantilever-Based Biosensor For Detection Of Target Bacteria, Yunyan Cheng
Development Of A Carbohydrate Microarray System And A Microcantilever-Based Biosensor For Detection Of Target Bacteria, Yunyan Cheng
All Theses
The increasing number of disease outbreaks results in a demand for novel pathogen detectors. Carbohydrates serving as receptors for pathogen lectins have become the focus of such research. Two primary sugars, ‡-D-mannose and ‡-L-fucose, as receptors for Escherichia coli and Pseudomonas aeruginosa, respectively, are of great interest to researchers due to their high affinity. These interactions can be studied using carbohydrate microarrays, which are also suitable platforms for detecting bacterial pathogens. In addition, carbohydrates have the potential to act as sensing molecules in microcantilever-based biosensors. The goal of this research was to design a carbohydrate microarray system to study the …
Pulse Echo Ultrasonic Testing Of Adhesive Bonded Joints For Automotive Applications, Arun Ganapathi
Pulse Echo Ultrasonic Testing Of Adhesive Bonded Joints For Automotive Applications, Arun Ganapathi
All Theses
The growing prominence of adhesive bonding technology in automotive manufacture has necessitated the development of reliable and robust quality assurance techniques. Of the different Nondestructive testing technologies available, Ultrasonic testing has shown itself to be the most promising technique to satisfy the requirements in automobile production. The current work attempts to apply two variations of the Ultrasonic Pulse Echo technique namely Contact and Immersion testing for inspecting typical hem bonded automotive joints. The joints have been tested for disbond at the various metal-adhesive interfaces by using an ultrasonic scan comparison method which compares the acquired signals against a reference scan …
Effect Of Crust Freezing On The Quality And Survival Of Escherichia Coli And Salmonella Typhimurium In Raw Poultry Products, Byron Chaves-Elizondo
Effect Of Crust Freezing On The Quality And Survival Of Escherichia Coli And Salmonella Typhimurium In Raw Poultry Products, Byron Chaves-Elizondo
All Theses
Industry has widely used freezing as a strategy to halt pathogen growth and more recently, crust freezing has been suggested as a means to improve mechanical operations, quality, and safety of poultry products. Two separate studies were conducted to evaluate the effect of crust freezing (20 min, -85 ¡C) on the survival of Escherichia coli and Salmonella Typhimurium and on quality and shelf life of raw chicken breasts, with or without skin. For the first study, ampicillin-resistant E. coli JM 109 and nalidixic acid-resistant S. Typhimurium were used in the experiments. A set of cultures was subjected to cold-shock stress …
Evaluation Of A Pilot-Scale Constructed Wetland Treatment System For Renovation Of A Specific Oilfield Produced Water For Beneficial Use, Jennifer Horner
Evaluation Of A Pilot-Scale Constructed Wetland Treatment System For Renovation Of A Specific Oilfield Produced Water For Beneficial Use, Jennifer Horner
All Theses
Oilfield produced waters (OPWs) are brought to the surface when oil reservoirs contained in water-bearing geologic units are extracted. Large volumes of OPW present environmental challenges concerning disposal, as well as potential opportunities for beneficial use if constituents posing risk can be remediated. In this study a pilot-scale constructed wetland treatment system (CWTS) was specifically designed to treat an OPW from sub-Saharan Africa for use in irrigation and livestock watering. Three major objectives were to: characterize and identify constituents of concern in the OPW in terms of beneficial use, evaluate treatment performance of a pilot-scale constructed wetland treatment system for …
The Effects Of A Course On Statistical Literacy Upon Students' Challenges To Statistical Claims Made In The Media, Rose Martinez-Dawson
The Effects Of A Course On Statistical Literacy Upon Students' Challenges To Statistical Claims Made In The Media, Rose Martinez-Dawson
All Dissertations
Statistical literacy involves critically evaluating and questioning statistics encountered in everyday life. The purpose of this study was to evaluate students' questions (challenges) concerning statistics encountered in everyday life and how these challenges differed before and after taking an undergraduate statistics course, entitled Statistics in Everyday Life 200 (SIEL), which focused on statistical literacy. One hundred forty-four students were given three media articles to indicate questions they had concerning statistics cited in the articles and explain why these questions were important to ask. Students' responses were categorized based on the topic and were assessed using the Statistics Literacy Components Rubric …
Packet Error Rate Predictive Model For Sensor Radios On Fast Rotating Structures, Lei Tang
Packet Error Rate Predictive Model For Sensor Radios On Fast Rotating Structures, Lei Tang
All Dissertations
Wireless sensing technologies have raised widespread interests in the applications for monitoring fast rotating or moving machinery structures in manufacturing environments. Over the past five years, a few wireless sensor systems have been implemented and proven to feasibly work under fast rotation conditions. However, few of these studies evaluated data transmission performance of the wireless communication systems. Although the manufacturing environments are known to be harsh for wireless communication, in many cases, an excellent data throughput is critical for such systems. Conventional statistical methods for studying wireless communication channels are not sufficient in this specific field.
This dissertation presents systematic …
Novel Vascular Grafts Based On Polyphenol-Stabilized Acellular Tissue Scaffolds, Ting-Hsien Chuang
Novel Vascular Grafts Based On Polyphenol-Stabilized Acellular Tissue Scaffolds, Ting-Hsien Chuang
All Dissertations
The Cardiovascular diseases (CVDs) continue to be the leading cause of morbidity and mortality worldwide. The most common form of CVDs is occlusion of blood flow thus limiting blood supply to specific tissues or organs. Atherosclerosis is a leading cause of coronary heart disease and stroke, which were responsible for more than 25% of deaths in 2004.
The demand for vascular graft is huge. In United States alone, approximately 500,000 coronary artery bypass graft surgeries are performed annually. Synthetic polymers such as Dacron and ePTFE have been successfully applied in large diameter blood vessel prosthesis; however, for small diameter (inner …
Effect Of Impurities On Performance Of Proton Exchange Membrane Fuel Cell Components, Kitiya Hongsirikarn
Effect Of Impurities On Performance Of Proton Exchange Membrane Fuel Cell Components, Kitiya Hongsirikarn
All Dissertations
It is believed that proton–exchange membrane fuel cells (PEMFCs) are going to be exploited as power generation devices for stationary, automotive, and portable applications in the near future because of their high performance and environmental friendliness. Up to the present, wide spread utilization of PEMFCs is not viable because of their cost and durability in the presence of fuel and oxidant stream impurities. These impurities include NH3, hydrocarbons, CO, CO2, halogenated compounds, cations, etc. The objective of this research was to investigate the effect of these harmful contaminants containing in the H2 fuel stream on …
Evaluation Of Factors That Modulate Cellular Adipogenesis For Breast Tissue Engineering Strategies, Cheryl Gomillion
Evaluation Of Factors That Modulate Cellular Adipogenesis For Breast Tissue Engineering Strategies, Cheryl Gomillion
All Dissertations
It is estimated that this year more than 200,000 women in the United States will be diagnosed with breast cancer. Treatment for most occurrences of breast cancer will often include surgical removal of the tumorigenic tissue, resulting in a soft tissue defect within the subcutaneous tissue of the skin. Post-surgical reconstruction methods are often sought by patients to restore the aesthetic function of the breast via cellular or non-cellular methods; however, because of complications associated with currently used methods for breast reconstruction, researchers are investigating tissue engineering methods to produce viable autologous adipose tissue for breast reconstruction.
Previous research in …
Sequencing And Functional Analysis Of A Multi-Component Dioxygenase From Pah-Degrading Sphingomonas Paucimobilis Epa505, Renuka Miller
Sequencing And Functional Analysis Of A Multi-Component Dioxygenase From Pah-Degrading Sphingomonas Paucimobilis Epa505, Renuka Miller
All Dissertations
Polycyclic aromatic hydrocarbons (PAHs) are hydrophobic organic compounds consisting of two or more fused benzene rings. PAHs derive from many different sources including petroleum refining, wood treatment, and coal coking industries. Because of their structural stability and water insolubility, PAHs are extremely resistant to degradation. These compounds are also believed to have mutagenic, carcinogenic, and teratogenic effects. Therefore, there are currently 16 PAH compounds on the EPA's list of priority pollutants.
Many species of bacteria have the ability to breakdown these persistent pollutants. However, bioremediation strategies using these organisms have many unresolved issues. While laboratory experiments can easily demonstrate the …
Characterization Of Anti-Proteolytic And Anti-Proliferative Activities Of Pentagalloylglucose; Its Potential Application As A Therapeutic Agent In Vascular Diseases, Chaitra Cheluvaraju
Characterization Of Anti-Proteolytic And Anti-Proliferative Activities Of Pentagalloylglucose; Its Potential Application As A Therapeutic Agent In Vascular Diseases, Chaitra Cheluvaraju
All Dissertations
Cardiovascular diseases are the leading causes of mortality in the United States and will cost around $500 billion this year alone. Elevated proteolytic activity, increased proliferation and migration of vascular smooth muscle cells are hallmarks of atherosclerosis, stenosis and aortic aneurysms. These diseases often manifest the transdifferentiation of vascular smooth muscle cells into osteoblast-like cells followed by deposition of hydroxyapatite–like mineral in the arterial walls.
Currently, there are no standard treatments available for vascular calcification or aneurysms. Atherosclerosis treatment options are limited to statins while balloon angioplasty and stenting – surgical procedures for stenosis, often end in restenosis. Therefore, we …
The Genetics Of Metal Uptake In Caulobacter Crescentus: Characterization Of Regulators And Identification Of Receptors, Leah Howell
All Dissertations
Caulobacter crescentus is an oligotrophic, Gram negative bacterium with a dimorphic lifecycle. It is a model system for cell cycle regulation and cellular development. Since C. crescentus resides primarily in freshwater, this microorganism can also serve as a model system for nutrient uptake by oligotrophic freshwater species. This study focused on TonB-dependent receptors and metal-dependent regulators in C. crescentus.
To maintain appropriate levels of iron within the cell, bacteria have evolved mechanisms to control iron uptake, storage, and use. In microbes, there are two protein families possessing members that accomplish this: Fur and Rrf2. In the C. crescentus genome, there …
Breaking The Ice: Prospects For Canadian-American Institutional Change In The Governance Of The Northwest Passage, Jeffrey Parkey
Breaking The Ice: Prospects For Canadian-American Institutional Change In The Governance Of The Northwest Passage, Jeffrey Parkey
All Dissertations
This study assesses four institutional approaches to governing the use of the Northwest Passage, including the current rules in use. The assessment is conducted through the use of expert interviews, a review of the theoretical literature, and an examination of comparative cases. Because of significant environmental changes underway in the Arctic region, institutional change for Northwest Passage management is receiving increased attention. Due to the potential environmental and security impacts of regularized ship transits through the Northwest Passage, a number of informed observers have discussed the need for considering alternative means of governing the waterway. The advantages and disadvantages of …
Comprehensive Thermal Modeling Of Power Split Hybrid Power-Train And Electronics, Abdel Mayyas
Comprehensive Thermal Modeling Of Power Split Hybrid Power-Train And Electronics, Abdel Mayyas
All Dissertations
Hybrid electric vehicle (HEV) uses both internal combustion engine (ICE) with an electric system. The combination of the electric power train with the ICE is intended to achieve both better fuel economies than the conventional vehicles and better performance. Several types of HEV exist with different layouts. Recent HEVs' make use of regenerative braking, which converts the vehicles' kinetic energy into electric energy instead of wasting it as heat as conventional brakes do. A hybrid-electric is more fuel efficient than ICE and has less environmental impact.
The new HEV with its new Key Characteristics and Configurations (i.e. Mechanical complexity, Multiple …
Pulsed-Laser Direct Writing Of Biological Materials, Yafu Lin
Pulsed-Laser Direct Writing Of Biological Materials, Yafu Lin
All Dissertations
Laser direct writing, developed based on modified laser-induced forward transfer (LIFT), has been emerging as one of the most promising biofabrication techniques. While some studies have been conducted to investigate laser direct writing of biological materials, there are some key challenges such as mechanisms of bubble formation, droplet formation and process-induced cell injury that have not been well elucidated. The objective of this dissertation is to study laser-induced droplet formation dynamics and process-induced cell injury in pulsed-laser direct writing of biological materials, and improve the existing laser direct-write techniques.
Phase explosion is identified as the dominant bubble formation mechanism in …
Evolutionary Strategies For Data Mining, Rose Lowe
Evolutionary Strategies For Data Mining, Rose Lowe
All Dissertations
Learning classifier systems (LCS) have been successful in generating rules for solving classification problems in data mining. The rules are of the form IF condition THEN action. The condition encodes the features of the input space and the action encodes the class label. What is lacking in those systems is the ability to express each feature using a function that is appropriate for that feature. The genetic algorithm is capable of doing this but cannot because only one type of membership function
is provided. Thus, the genetic algorithm learns only the shape and placement of the membership function, and in …
Influence Of Topography Of Endovascular Stent Material On Smooth Muscle Cell Response, Vipul Taneja
Influence Of Topography Of Endovascular Stent Material On Smooth Muscle Cell Response, Vipul Taneja
All Theses
Although implantation of endovascular stents for the treatment of coronary and peripheral artery diseases has been one of the most rapidly used medical interventions, significant limitations in terms of a restenosis rate of 10-30% still persists. Neointimal hyperplasia characterized by a phenotypic shift of smooth muscle cells from contractile to synthetic type, has been deemed to be the predominant cause of restenosis. A number of stent surface parameters, including topography, have been attributed to play an important role in stent performance. Although endothelial cell and thrombotic response to surface roughness have been well evaluated, the effect of topography of the …
Response Of Warm Season Turfgrasses To Reduced Light Environments, Jeffrey Atkinson
Response Of Warm Season Turfgrasses To Reduced Light Environments, Jeffrey Atkinson
All Theses
Shade or low light tolerance is an increasingly important issue to turf managers as they are often expected to grow turf in less than ideal agronomic conditions. As permanent structures such as residential buildings add to already problematic shade caused by trees, and other barriers, new solutions are needed to help turf managers provide acceptable turf conditions. The plant growth regulator trinexapac-ethyl (TE) can lessen negative responses of turfgrass to shade.
Two experiments were conducted during the summers of 2008 and 2009 to evaluate various grasses under a reduced light environment (RLE). In the first study, performance of `Diamond' zoysiagrass …
Biofuel Ethanol Production By Saccharomyces Bayanus, The Champagne Yeast, Kristen Miller
Biofuel Ethanol Production By Saccharomyces Bayanus, The Champagne Yeast, Kristen Miller
All Theses
The importance of biofuel ethanol is growing as the demand for clean, renewable fuels produced from non-food sources increases. The United States relies mainly on corn and the yeast Saccharomyces cerevisiae for the production of ethanol. A shift to cellulosic feedstocks, as the main source of biomass for ethanol production, would alleviate the pressure on farmers to produce corn for both the food industry and the ethanol industry. Example cellulosic feedstocks include switchgrass, sorghum, and canary grass. The cellulosic feedstocks are typically grown on land that cannot support economic food production, and thus lay unused.
For cellulosic feedstocks to be …
Correcting Liquefaction Resistance Of Partially Saturated Soil Using Compression Wave Velocity, Md Hossain
Correcting Liquefaction Resistance Of Partially Saturated Soil Using Compression Wave Velocity, Md Hossain
All Theses
Empirical relationships for correcting liquefaction resistance of partially saturated soil using longitudinal (P-) wave velocity (VP) and shear (S-) wave velocity (VS) are developed and evaluated in this thesis. The relationships are based on the laboratory test results for four different types of sands and one silt published by other investigators. The data used to develop the relationship with VP exhibit less scatter than the data used to develop the relationship with VP/VS. For this reason, the VP based relationship is recommended for correcting liquefaction resistance of partially saturated soil. …
Identification Of Patterns And Controls Of The Distribution Of Groundwater Discharge To Streams, Curtis Gebhard
Identification Of Patterns And Controls Of The Distribution Of Groundwater Discharge To Streams, Curtis Gebhard
All Theses
Groundwater discharge is a key component in understanding the interaction between groundwater and surface water. It provides baseflow to streams and can transport nutrients and contaminants to related aquatic ecosystems. It can also influence fish behaviour, spawning, migration and provide areas of refuge during summer and winter months. There are a variety of techniques that are used to characterize the magnitude of groundwater discharge including seepage meters, field permeameters, and piezometers and manometers, however the controls for the magnitude and distribution of discharge remain poorly understood. The purpose of this study was to conduct field investigations complimented with numerical analysis …
Evaluation Of Tetrachloroethene Dechlorination Under Low Ph Conditions In Microcosms And Enrichment Cultures, Michael Hickey
Evaluation Of Tetrachloroethene Dechlorination Under Low Ph Conditions In Microcosms And Enrichment Cultures, Michael Hickey
All Theses
Chlorinated ethenes are among the most prevalent groundwater contaminants found at hazardous waste sites throughout the United States. Two such sites are the Statesville FCX OU3 Superfund Site in North Carolina and the C-area at the Savannah River Site (SRS) in Aiken, SC. Both sites are contaminated with two of the more common chlorinated ethenes; tetrachloroethene (PCE) and trichloroethene (TCE). Anaerobic biological reductive dechlorination is an increasingly common treatment option. There are two main concerns as to the feasibility of this approach. The first is if the microbes are present that are needed for carrying out complete reductive dechlorination of …
Experiencing Transition, Kara Renfro
Experiencing Transition, Kara Renfro
All Theses
ABSTRACT
My sculpture offers visual cues and displayed experiences for the viewer to reflect
upon past experiences and recognize the transitions that have occurred throughout their
lives because of those memories or adventures that become important due to their fragile and brief nature. These transitions from one place to another shed light on our past and unfold a journey that leads us through the inevitably constant changing circumstances of everyday life.
The artifacts and documents displayed throughout this body of work speak to the
human need to memorialize the past through collecting, documenting, and performing. It
is through observing this …
The Tiger Vol. 104 Issue 24 2010-11-19, Clemson University
The Tiger Vol. 104 Issue 24 2010-11-19, Clemson University
Tiger Newspapers
No abstract provided.
The Tiger Vol. 104 Issue 23 2010-11-12, Clemson University
The Tiger Vol. 104 Issue 23 2010-11-12, Clemson University
Tiger Newspapers
No abstract provided.
The Impact Of A Youth Development Program On Secondary Students’ Career Aspirations, Bonita Williams, Jody Thompson, Tonya Taylor, Karen Eley Sanders
The Impact Of A Youth Development Program On Secondary Students’ Career Aspirations, Bonita Williams, Jody Thompson, Tonya Taylor, Karen Eley Sanders
Journal of Youth Development
This study’s purpose determined the extent to which adolescents’ participation in a youth development program may be linked to the participants’ post-secondary education and career aspirations. One hundred and seven adolescents, ages 14-19 in grades 8-12 completed Holland’s Vocational Interest Survey and the 4-H Career Decision Survey. Ordinal regression analysis indicated participation in 4-H had a positive impact on career decisions for students who participated in 4-H for two years (p< .038) and six years (p< .001). Significant differences were apparent with 80% of the racial/ethnic groups surveyed concerning a college fair’s impact on career choice and college major determination.
The Tiger Vol. 104 Issue 22 2010-11-05, Clemson University
The Tiger Vol. 104 Issue 22 2010-11-05, Clemson University
Tiger Newspapers
No abstract provided.