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Effect Of Peptidoglycan-Polysaccharide Complex On Reproductive Efficiency And Mastitis In Sheep, Ida Holaskova Aug 2002

Effect Of Peptidoglycan-Polysaccharide Complex On Reproductive Efficiency And Mastitis In Sheep, Ida Holaskova

Graduate Theses, Dissertations, and Problem Reports (ETD)

Bacterial infections associated with mastitis reduce pregnancies in cattle. Effects on pregnancy and incidence of mastitis in sheep were investigated after immunization with peptidoglycan-polysaccharide (PG-PS) and killed cells from Strep. pyogenes. Rambouillet (n = 100) and mixed breed (n = 18) ewe lambs were immunized (∼d42 and 22 before breeding) with PG-PS (30mugPG/kg/bw) or killed cells or were not immunized (Control, n = 117). IgG antibodies were detected by ELISA. Ewes were bred at synchronized estrus. All immunized and half of non-immunized ewes were challenged with PG-PS (60mugPG/kg/bw) d5 after breeding. Although proportion of ewes pregnant at d42 did not …

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Advanced Generation Niosh Automatically Deployable Rollover Protective Structure (Autorops), Khaled Ali Alkhaledi Aug 2002

Advanced Generation Niosh Automatically Deployable Rollover Protective Structure (Autorops), Khaled Ali Alkhaledi

Graduate Theses, Dissertations, and Problem Reports (ETD)

AutoROPS have been developed recently under the sponsorship of the National Institute for Occupational Safety and Health (NIOSH) in collaboration with the Mechanical and Aerospace Engineering Department at West Virginia University. Unfortunately, numerous tractors' operators have removed the factory ROPS from the Tractors because of the lack of housing area on the tractor, which may result in frequent collision between the ROPS and low-hanging tree branches.;One main purpose of this work was to study the base of the second generation AutoROPS, to insure that the base can withstand the impact loads associated with the rollover of any farm tractor. Another …

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Reducing Interferences In Glow Discharge Spectroscopies Using Transient Operation And Collision -Induced Dissociation, Glen Paul Jackson Aug 2002

Reducing Interferences In Glow Discharge Spectroscopies Using Transient Operation And Collision -Induced Dissociation, Glen Paul Jackson

Graduate Theses, Dissertations, and Problem Reports (ETD)

Plasma sources for optical spectroscopy and mass spectrometry have provided scientists unprecedented knowledge about the fundamental properties and behavior of matter. As informative and useful as these methods are; however, there is still considerable room for improvement. The accuracy and precision of quantitative analyses by mass spectrometry and optical emission spectroscopy are often dependent on the presence of interferences. Interferences are defined as a measured signal response to a species at the spectral position of interest for the analyte that is not caused by the analyte. Because the presence of spectral interferences can deleteriously affect the integrity of reported results, …

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Relative Abundance, Temporal Distribution, And Functional Feeding Groups Of Aquatic Insects In Two First-Order Southwestern Pennsylvania Streams, Judith S. Steinberg Aug 2002

Relative Abundance, Temporal Distribution, And Functional Feeding Groups Of Aquatic Insects In Two First-Order Southwestern Pennsylvania Streams, Judith S. Steinberg

Graduate Theses, Dissertations, and Problem Reports (ETD)

Two first to second order streams (Kent Run and Munnell Hollow) at Ryerson Station State Park, Greene County, Pennsylvania, were compared as to water parameters (dissolved oxygen, hardness, temperature, pH, and current velocity), species diversity, and abundance of both immature and adult insects. Samples were taken biweekly for one year from May, 1999 through April, 2000 for a total of 26 sampling periods. Data were analyzed using a repeated measures ANOVA. Kent Run had lower dissolved oxygen, higher pH and hardness, lower temperatures, and higher current velocity. A total of 137 taxa were collected at both streams. Of the total …

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Vanadate-Induced Cell Cycle Regulation And Its Signal Transduction Pathway, Zhuo Zhang Aug 2002

Vanadate-Induced Cell Cycle Regulation And Its Signal Transduction Pathway, Zhuo Zhang

Graduate Theses, Dissertations, and Problem Reports (ETD)

Vanadate is potent toxic and carcinogenic agent. The mechanisms of its toxic and carcinogenic actions are still under investigation. Cell cycle arrest is an important mechanism in maintaining genomic stability and integrity in response to environmental stress. The present study investigated the possible mechanisms involved in vanadate-induced cell cycle arrest and its signal transduction pathway. The results show that vanadate caused G2/M phase arrest A549 cells. p21 and cdc25C affected on cyclin B/cdc2 complex, resulting in the cell cycle arrest at G2/M phase. p38 and extracellular signal-regulated protein kinase (ERK) were involved in the regulation of these cell cycle regulatory …

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Modulation Of Thiols And Pulmonary Immune Responses Due To Diesel Exhaust Particle (Dep) Exposure, Nabil Hussain Al-Humadi May 2002

Modulation Of Thiols And Pulmonary Immune Responses Due To Diesel Exhaust Particle (Dep) Exposure, Nabil Hussain Al-Humadi

Graduate Theses, Dissertations, and Problem Reports (ETD)

Environmental exposure to diesel exhaust particles (DEP) has been of concern because of its potential contribution to the increased prevalence of acute and chronic airway diseases. The objective of this study was to investigate the role of thiol changes (due to DEP exposure) in immune responses. Rats were exposed to OVA, DEP, or both by intratracheal instillation (IT) and/or inhalation. IT-DEP exposure significantly increased the inflammatory parameters and thiol levels in both Sprague-Dawley and Brown Norway rats. Exposure to DEP and/or OVA resulted in significant increases in neutrophils, LDH, total protein, and albumin content in lavage fluid. Alveolar macrophage (AM) …

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Depression And Self -Silencing In Lesbian And Heterosexual Women, Samantha Ann Kirk May 2002

Depression And Self -Silencing In Lesbian And Heterosexual Women, Samantha Ann Kirk

Graduate Theses, Dissertations, and Problem Reports (ETD)

Depression among lesbians is an underexplored area in the literature of the psychology of women and in depression research. A few investigators have hypothesized about the factors that place lesbians at risk for depression, and have explored those hypotheses experimentally. However, there is a large gap in the understanding of lesbians and depression. Dana Jack (1991) proposed a model of depression which holds that women who fail to represent their experiences to romantic partners are at increased risk for depression. One hundred and seventy participants were recruited to test this model (85 lesbians and 71 heterosexual women, as well as …

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Developing A Model To Facilitate The Improvement Of The Quality Of Crash Data Collection In West Virginia, David Scott Bucy May 2002

Developing A Model To Facilitate The Improvement Of The Quality Of Crash Data Collection In West Virginia, David Scott Bucy

Graduate Theses, Dissertations, and Problem Reports (ETD)

Most federal, state, and local agencies use information derived from traffic crash reports for decision-making purposes. The accuracy and timeliness of this data is vital to safety program managers and traffic engineers. The purpose of this study was to assess improvements in the crash data process and examine the impact of the research assessment model developed by the West Virginia University Project Research Team on the West Virginia Uniform Traffic Crash Report.;A three-year research study funded by the West Virginia Division of Highways was conducted statewide with law enforcement agencies at all levels. Four hundred fifty-three officers participated in the …

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Analysis Of Complex Ventilation Networks In Multiple Fan Coal Mines, Khaled Ali El-Nagdy May 2002

Analysis Of Complex Ventilation Networks In Multiple Fan Coal Mines, Khaled Ali El-Nagdy

Graduate Theses, Dissertations, and Problem Reports (ETD)

Coal mines require very effective and proper ventilation systems not only to keep the levels of explosive, harmful gases and dust to a safe level but also to deliver enough fresh air for miners to breathe. Depending upon the size of the mine and the quantity of gases and dust in this mine, it could be ventilated by using a single fan or several fans. There are two types of fans used in mines: vane axial and centrifugal.;In multiple-fan systems, each individual fan influences the performance of the whole system, including the other fans. Each fan in the system has …

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Perceived Efficacy And Utilization Of The Oralcdx Brush Biopsy, Courtney Niccole Huffman May 2002

Perceived Efficacy And Utilization Of The Oralcdx Brush Biopsy, Courtney Niccole Huffman

Graduate Theses, Dissertations, and Problem Reports (ETD)

The OralCDx is a preliminary screening tool developed to identify suspicious lesions. Despite large numbers of persons diagnosed with oral cancers annually, minimal research has been conducted on the efficacy and utilization rates of OralCDx. The purpose of this study is to determine perceived efficacy and utilization rates of OralCDx nationwide. A 16-item survey was used to survey a random sample of 100 dentists and a 6-item survey was used to survey a random sample of 400 patients. Data analyses were conducted using frequencies, cumulative frequencies, percents, analysis of variance, and tests of chi-square using the JMP program. Preliminary results …

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Herbal Supplement Education In Dental Hygiene Curricula, Lisa Elena Lisauckis May 2002

Herbal Supplement Education In Dental Hygiene Curricula, Lisa Elena Lisauckis

Graduate Theses, Dissertations, and Problem Reports (ETD)

While there is evidence in the literature of herbal supplement education in other disciplines, inclusion in dental hygiene curricula is not reported. The purpose of this study was to assess the prevalence and extent of herbal supplement education in the 256 accredited dental hygiene programs in the United States. A survey was sent to program directors. Data analyses, including frequencies, cumulative frequencies, percentages, analyses of variance, and test of Chi Square were conducted using JMP program. Surveys revealed 63% of respondents (n = 160) included herbal supplement education and primarily incorporated it in the pharmacology course (67%). Statistically significant differences …

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Sensitivity Of State Aid Allocation To Measures Of Needs And Resources In Local Governments, Adam Dale Baus May 2002

Sensitivity Of State Aid Allocation To Measures Of Needs And Resources In Local Governments, Adam Dale Baus

Graduate Theses, Dissertations, and Problem Reports (ETD)

This analysis examines the sensitivity of state intergovernmental aid, per capita, to measures of resources, infrastructure, social services, social problems and demographics in Northern and Southern local governments in 1982 and 1992. Time-periods chosen are based on the potential for domestic policies born through new federalism to harm local governments through lesser amounts of available state aid. North and South are compared to account for possible regional differences. Regardless of region and time however, redistribution efforts to local governments with higher levels of need and lower levels of resources are not particularly good. Redistribution tendencies present in 1982 declined by …

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Design And Implementation Of Web-Based Gis For Forest Fragmentation Analysis, Fei Wang May 2002

Design And Implementation Of Web-Based Gis For Forest Fragmentation Analysis, Fei Wang

Graduate Theses, Dissertations, and Problem Reports (ETD)

The advantages and limitations of current web GIS software for forest fragmentation information and analysis functionality were investigated using Landsat Thematic Mapper data of 1987 to 1999 for a test site in northern West Virginia. ESRI's ArcIMS technology was used to build a Web-based forest fragmentation analysis system to query, represent, and analyze the status of forest fragmentation using landscape metrics. Both ArcIMS HTML and Java fragmentation analysis tools were constructed. The web GIS was evaluated with respect to accessibility, navigation, interactive cartographic functionality, and spatial analysis functionality. The current ArcIMS approach was found to offer only limited support for …

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Comparison Of Broiler Breeder Production And Fertility In A Colony Cage System With Two Different Floors Versus A Slat-Floor System, Joseph Wayne Massey May 2002

Comparison Of Broiler Breeder Production And Fertility In A Colony Cage System With Two Different Floors Versus A Slat-Floor System, Joseph Wayne Massey

Graduate Theses, Dissertations, and Problem Reports (ETD)

Two separate trials were conducted to compare egg production, egg weight, shell thickness, albumin height, fertility, and mortality of naturally mated broiler breeders maintained on either a slat and litter floor or in two tiered colony cages. In the first trial there was no difference (P > 0.05) in egg production between the two treatments. There was also no significant difference in hen mortality. Higher (P < 0.05) egg shell quality, albumin height, and shell thickness were observed in the cage maintained hens. Lower fertility (P < 0.05) was observed in the cage maintained hens. In the second trial production parameters were compared in naturally mated broiler breeders maintained on slat and litter floor, in colony cages on the original slats, and in colony cages on a modified slats. The modified slats were constructed from plastic and had a two piece design which produced a slight cushioning on the top of the slats. Egg production and mortality were not different (P > 0.05) among the three treatments. Eggshell thickness, albumin height, and shell thickness were lower (P > 0.05) in the litter and slat floor but not between the two cage treatments (P > 0.05). Fertility was higher (P …

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Effects Of Intertrial Interval And D-Amphetamine On Temporally Organized Behavior Of Pigeons, Lori Marie Lieving May 2002

Effects Of Intertrial Interval And D-Amphetamine On Temporally Organized Behavior Of Pigeons, Lori Marie Lieving

Graduate Theses, Dissertations, and Problem Reports (ETD)

The present experiment examined the effects of intertrial interval and d-amphetamine on pecking of pigeons maintained by an interval bisection task. The side-tracking group responded based on the location of the key and the color-tracking group responded based on the color of the key. Intermediate stimulus durations were tested, separated by either a 10- or 100-s intertrial interval and a range of d-amphetamine doses and saline were administered. Acquisition of performance in the side-tracking group occurred in fewer sessions relative to the color-tracking group. In both groups, the proportion of long responses increased as a function of stimulus duration. These …

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Assessing The Perceived Impact Of Computer-Assisted Instruction On Physical Therapy Education, Mia L. Erickson May 2002

Assessing The Perceived Impact Of Computer-Assisted Instruction On Physical Therapy Education, Mia L. Erickson

Graduate Theses, Dissertations, and Problem Reports (ETD)

Computer Assisted Instruction (CAI) is becoming more common in allied health education. Research on CAI has provided mixed results. The purpose of this study was to compare uses of CAI in entry-level physical therapist (PT) and physical therapist assistant (PTA) programs. Secondary purposes included determining faculty attitudes toward CAI, determining how faculty select and evaluate CAI, and describing faculty perceptions of CAI and the computer-based licensing exam. Results indicate no significant differences in the amount of CAI in PT and PTA programs. Positive aspects reported include improved knowledge of technology and improved independence with information gathering. Negative aspects reported include …

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Combustion Analysis And Particulate Mutagenicity Characterization For A Single-Cylinder Diesel Engine Fueled By Fischer -Tropsch Derived Liquids, Michael Hayden Mcmillian May 2002

Combustion Analysis And Particulate Mutagenicity Characterization For A Single-Cylinder Diesel Engine Fueled By Fischer -Tropsch Derived Liquids, Michael Hayden Mcmillian

Graduate Theses, Dissertations, and Problem Reports (ETD)

Further growth of diesel engines in the light-duty and heavy-duty vehicular markets is closely linked to the potential health risks of diesel exhaust. Cleaner burning fuels, such as those derived from natural gas via the Fischer-Tropsch (FT) process, offer a potentially economically viable alternative to standard diesel fuel. As part of this study, a two-liter, single-cylinder, four-stroke direct-injected engine was instrumented for in-cylinder pressure measurements. The emissions and performance data from engine operation with Federal low sulfur No. 2 diesel fuel (DF) and natural gas derived FT fuel were compared. Also as part of the study, an investigation was carried …

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Flow Unit Prediction With Limited Permeability Data Using Artificial Neural Network Analysis, Benjamin Hale Thomas May 2002

Flow Unit Prediction With Limited Permeability Data Using Artificial Neural Network Analysis, Benjamin Hale Thomas

Graduate Theses, Dissertations, and Problem Reports (ETD)

The Appalachian Basin has numerous abandoned or marginally producing oilfields having significant recoverable oil remaining in place. Typically production records and reservoir data is not available. Presented is a new methodology, applicable to any field having limited records, designed for reservoir characterization via flow unit identification.;This methodology utilizes limited core permeability data from a few wells as a key to predicting flow units within a field when only log-based data is available. Primary software tools used include NeuroShell 2, an artificial neural network (ANN) program, and the Boast98 numerical simulator.;Various techniques for flow unit identification including graphic approaches using the …

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Prediction Of Life -Threatening Events In Infants Using Heart Rate Variability Measurements, Xueyan Xu May 2002

Prediction Of Life -Threatening Events In Infants Using Heart Rate Variability Measurements, Xueyan Xu

Graduate Theses, Dissertations, and Problem Reports (ETD)

Sudden infant death syndrome (SIDS) is the sudden death of an infant under 1 year old without any apparent sign ahead of time. It is the leading cause of death of infants between the age of one month and one year in the developed countries. After thirty years substantial worldwide research, it is still impossible to predict or prevent SIDS. With the long-term goal to prevent SIDS, this study explores prediction of life-threatening events using heart rate variability (HRV). HRV is an indirect measure of the autonomic nervous system input to the cardiovascular system. The hypothesis is that infants who …

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Factors Related To The Information Needs And Desired Level Of Participation Of Older Women Engaged In Medical Decision Making, Ronald Ralph Martin May 2002

Factors Related To The Information Needs And Desired Level Of Participation Of Older Women Engaged In Medical Decision Making, Ronald Ralph Martin

Graduate Theses, Dissertations, and Problem Reports (ETD)

Previous research suggests that older adults prefer less information and involvement in medical decision-making scenarios than younger adults. No previous research has empirically explored the factors that might influence the information and involvement preferences of older adults in medical decision-making scenarios. The present study involved an investigation of the influence of four factors on information and involvement needs: the complexity of the medical information, cognitive abilities, attitudes toward medical authority and health locus of control beliefs. Complexity was defined by contrasting reading levels (i.e., medical scenarios written at the 4th- vs. 11th-grade reading level). Cognitive abilities were measured using the …

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Antitumor Activity Of Antimalarials In Human Breast Cancer Cells, Qun Zhou May 2002

Antitumor Activity Of Antimalarials In Human Breast Cancer Cells, Qun Zhou

Graduate Theses, Dissertations, and Problem Reports (ETD)

Previously we showed that quinidine arrested MCF-7 cells in G1 phase of the cell cycle and led to a G1 to G0 transition followed by apoptotic cell death (Wang et al., 1998). The present experiments demonstrate that MCF-7, MCF-7ras, T47D, MDA-MB-231, and MDA-MB-435 cells transiently differentiate before undergoing apoptosis in response to quinidine. The cells accumulated lipid droplets and the cytokeratin 18 cytoskeleton was reorganized. Hyperacetylated histone H4 appeared within 2 h of the addition of quinidine to the medium, and levels were maximal by 24 h. Quinidine treated MCF-7 cells showed elevated p21/WAF1, hypophosphorylation and suppression of retinoblastoma protein, …

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Perceptions Of Banned Drugs In Athletics In Relation To Sport Participation, Gender, And Socioeconomic Status, Torri P. Hill May 2002

Perceptions Of Banned Drugs In Athletics In Relation To Sport Participation, Gender, And Socioeconomic Status, Torri P. Hill

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this study was to examine college athletes' perceptions regarding illegal drugs in sport related to sport (team/individual), gender, and socioeconomic status. It was hypothesized that male, team sport, and higher socioeconomic athletes would view drug use in sport as more appropriate. A demographic data sheet and King Drug Doping in Sport Questionnaire (KDSQ) (King, 1991) was administered to 93 athletes in CHAMPS/Life Skills classes at an Eastern Division I institution. To scale reliability and construct validity, Cronbach's alpha coefficients were obtained and a principal components factor analysis with varimax rotation was run. Findings revealed weak Cronbach alpha …

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Nest-Site Resources For Cavity-Nesting Birds In The Southern Allegheny Mountain Forests Of West Virginia, Harry A. Kahler May 2002

Nest-Site Resources For Cavity-Nesting Birds In The Southern Allegheny Mountain Forests Of West Virginia, Harry A. Kahler

Graduate Theses, Dissertations, and Problem Reports (ETD)

Cavity-nesting birds may be negatively impacted by a lack of proper nesting sites. Southern Allegheny Mountain forests of West Virginia are unique due to the juxtaposition and diversity of forest cover types. Management must focus on monitoring wildlife population levels as well as habitat requirements within each cover type. Cavity tree abundance significantly differed among central hardwood (x¯ = 16.4; SE = 5.3), northern hardwood (x¯ =12.7; SE = 6.8), and boreal forest cover types (x¯ = 7.2; SE = 3.6) ( P < 0.0001). Black locust (Robinia pseudoacacia) and American beech (Fagus grandifolia) were most likely to have tree cavities, yet beech may be influenced by increased mortality from recent outbreaks of beech bark disease initiated by the beech scale insect (Cryptacoccus fagisuga). Nesting bird community density, richness, and abundance do not differ among mature forests of the 3 cover types. Cavity-nesting species dependent on available tree holes were found most in the central hardwoods (P = 0.009). Forest managers should consider landscape level effects, as well as forest stand composition, when recommending silvicultural treatments.

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How Farmers In West Virginia Are Using Value-Added Processing To Increase Annual Income, Jennifer Leigh Lewis May 2002

How Farmers In West Virginia Are Using Value-Added Processing To Increase Annual Income, Jennifer Leigh Lewis

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this study was to describe methods of value-added processing being employed by farmers in West Virginia, the amount of interest in value-added processing as expressed by agriculture extension agents and farmers, and identified the number of value-added producers in West Virginia. The population targeted with the initial survey consisted of 28 agriculture extension agents in West Virginia representing 55 counties. The second telephone survey was directed to value-added producers within the state. From this data, four farms, Thistledew Farm, Kelly Smith, Headwater Farms and Higson's Farm, were chosen to participate in case studies. Value-added producers were identified …

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Effect Of Increased Energy In A Restricted Diet On Bone Mineral Composition And Breaking Load Of Young Rat Tibias, Marcia Ann Romanchak May 2002

Effect Of Increased Energy In A Restricted Diet On Bone Mineral Composition And Breaking Load Of Young Rat Tibias, Marcia Ann Romanchak

Graduate Theses, Dissertations, and Problem Reports (ETD)

Osteoporosis is a major health problem in the United States and those that are on energy restricted diets such as anorectic subjects. Thirty Wistar strain, young male rats were fed diets with varying quantities of fat for a period of four weeks (energy intake 67--75% of requirement). The rat tibias' physical properties were measured. Bone mineral composition testing was conducted for calcium, magnesium, and phosphorus, on the tibia shaft. There were no significant differences among the parameters of length, diameter, volume, density, bone bending (elasticity), fracture load, and minerals between experimental diets. There was a negative association between bending and …

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Relationship Between Maternal Prenatal Vitamin Use And Infant Iron Status, Jennie Pringle Wilkins May 2002

Relationship Between Maternal Prenatal Vitamin Use And Infant Iron Status, Jennie Pringle Wilkins

Graduate Theses, Dissertations, and Problem Reports (ETD)

Subjects were fifty-six women and their infants who were between the ages of six months and twenty-four months. They were clients of Special Supplemental Nutrition Program for Women Infants and Children (WIC) clinics. The WIC clinics were in the West Virginia counties of Ritchie, Gilmer, Calhoun, Braxton, Mason, Jackson, Pleasants, and Greenbrier where the anemia rates were greater than 10%.;Information concerning WIC participation, prenatal vitamin use, history of breast feeding, infant birth weight, and pre-term delivery were obtained through questionnaires. Infants' serum ferritin level was obtained through venous blood and analyzed.;This ex post facto study found no significant result in …

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Design, Construction And Testing Of An Innovative Mechanism For Manual Wheelchair Propulsion, Thomas S. Burke Jr. May 2002

Design, Construction And Testing Of An Innovative Mechanism For Manual Wheelchair Propulsion, Thomas S. Burke Jr.

Graduate Theses, Dissertations, and Problem Reports (ETD)

The concern for people with disabilities who are users of wheelchairs has become a dynamic research area in the past several years. As part of this research, new and innovative mechanisms that give the manual wheelchair users a mechanical advantage, and allow them to operate a standard wheelchair with less effort and muscle strain are being developed.;An innovative mechanism has been conceived, designed, built, and tested. It allows the user to propel a standard wheelchair in both the push and pull strokes of the handle. This new design will allow for a more symmetric muscle development of the shoulder and …

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Effects Of Electronic Communication On Culture Shock Of Spouses Of International Students, Diana Bennett May 2002

Effects Of Electronic Communication On Culture Shock Of Spouses Of International Students, Diana Bennett

Graduate Theses, Dissertations, and Problem Reports (ETD)

Culture shock is a serious problem for spouses of international students. This recollection study looked at use of telephone, web phone, email, chat, and online newspapers as predictors for culture shock. Fifteen spouses of international students at a mid-Atlantic university were interviewed with the same rated questions asking them to recall how they felt: When they first arrived in the United States, during their first six months here, during their second six months here, during their third six months here, and at the time of the interview. For the same time periods, they were also asked how many times a …

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Nucleation And Coagulation Of Particulate Matter Inside A Turbulent Exhaust Plume Of A Diesel Vehicle, Donghee Kim May 2002

Nucleation And Coagulation Of Particulate Matter Inside A Turbulent Exhaust Plume Of A Diesel Vehicle, Donghee Kim

Graduate Theses, Dissertations, and Problem Reports (ETD)

The objective of this study is to develop a physical model to accurately predict the nucleation, coagulation, and dynamics of particulate matter emission from diesel-fueled engines. The uniqueness of this research is that measured particulate matter (PM) size distribution data is not required a priori to solve the nucleation/coagulation equations; instead the PM concentration is predicted based on the fuel sulfur content, fuel to air ratio, exhaust flow rate, and the ambient conditions. This study presents the CFD modeling of an exhaust plume dispersed from a stack pipe of a tractor truck powered by a 330 HP diesel engine. This …

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Investigation Of Frictional Resistance On Orthodontic Brackets When Subjected To Variable Moments, Edward Mah May 2002

Investigation Of Frictional Resistance On Orthodontic Brackets When Subjected To Variable Moments, Edward Mah

Graduate Theses, Dissertations, and Problem Reports (ETD)

Friction and binding occur in orthodontics during sliding mechanics. This paper evaluated the influence of a variable moment, simulating mastication, placed at the bracket-archwire interface to determine its effects on friction. Friction of self-ligating brackets were also compared to stainless steel and ceramic brackets. Six archwires were combined with four brackets. Friction (static, kinetic and dynamic) and load (dynamic and apparent stiffness) were measured. Dynamic friction was the frictional force that occurred when the applied force was variable (dynamic load). The results showed that static and kinetic friction were similar while dynamic friction was statistically greater. The Minitwin and Transcend …

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