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Graduate Theses, Dissertations, and Problem Reports (ETD)

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Perimenopause: A Phenomenological Study Of Women And Health Care Providers In Rural Areas., Patricia Ann Kraft Jan 1997

Perimenopause: A Phenomenological Study Of Women And Health Care Providers In Rural Areas., Patricia Ann Kraft

Graduate Theses, Dissertations, and Problem Reports (ETD)

Using a four step phenomenological approach for inquiry, the researcher explored and interpreted data obtained from the lived experiences of sixteen perimenopausal women and eight health care providers living in rural areas. A purposive sampling technique was utilized. Participation was on a voluntary basis. Data collection procedures included a face-to-face semi-structured taped interview and completion of a demographic questionnaire. Following analysis of the data, twenty-two common essences were identified from intuiting of the interview data. These essences were classified into six major themes which integrated all the realities of the participants. The findings of the study revealed six major themes …

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Music By Judson Bracey., Judson Frank Bracey Jan 1997

Music By Judson Bracey., Judson Frank Bracey

Graduate Theses, Dissertations, and Problem Reports (ETD)

This portfolio is a two-volume set of original music compositions. The works contained herein represent a variety of media and genres, including chamber and large-ensemble pieces. The works are typically tonal, with the harmony usually combining tertian and quartal chords. In the Beginning is the major work of the portfolio. A six-movement cantata for mixed chorus and orchestra, its texts are adaptations of passages (primarily) from Genesis and the Gospel of John, chosen because of their parallels of language and meaning. In each of the movements (except the fourth, which is for orchestra alone), texts from two Biblical sources are …

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Molecular Mechanisms Involved In The Expression And Regulation Of Glucose-6-Phosphate Dehydrogenase By Dietary Polyunsaturated Fatty Acids., Deborah Lynne Hodge Jan 1997

Molecular Mechanisms Involved In The Expression And Regulation Of Glucose-6-Phosphate Dehydrogenase By Dietary Polyunsaturated Fatty Acids., Deborah Lynne Hodge

Graduate Theses, Dissertations, and Problem Reports (ETD)

The goal of this work was to determine how polyunsaturated fatty acids (PUFAs) affect gene expression at the molecular level. Glucose-6-phosphate dehydrogenase (G6PD) is a member of the family of lipogenic enzymes known to be inhibited by dietary PUFAs. Addition of PUFAs to diet causes a 70-80% decrease in G6PD enzyme activity and mRNA accumulation in liver with no change in transcriptional activity of the gene, indicating that regulation occurs at a posttranscriptional step. Similarly, regulation of G6PD by starvation and refeeding results in a 12- to 15-fold increase in G6PD activity and mRNA accumulation but no change in transcriptional …

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Examination Of A Cumulative Strategies Model For Drug Abuse Prevention: Risk Factor Reduction In High-Risk Children., Kimberly Ann Horn Jan 1997

Examination Of A Cumulative Strategies Model For Drug Abuse Prevention: Risk Factor Reduction In High-Risk Children., Kimberly Ann Horn

Graduate Theses, Dissertations, and Problem Reports (ETD)

A Cumulative Strategies Model for drug abuse prevention employs a process by which two or more drug abuse prevention strategies are used conjointly, such that each strategy targets two or more factors that place children at high risk for drug abuse. This model was examined using an innovative multiple component program called CHOICES. CHOICES emphasizes the reduction of risk factors that are characteristic of a high risk population of children of alcoholics and predictive of drug abuse. Using a repeated measures multiple baseline design, the results of this study revealed that the Cumulative Strategies Model inherent to the CHOICES program …

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Effect Of Hydrous Oxide Coatings On Adsorption Of Oxyanions By Clay Minerals., Swarn S. Dhaliwal Jan 1997

Effect Of Hydrous Oxide Coatings On Adsorption Of Oxyanions By Clay Minerals., Swarn S. Dhaliwal

Graduate Theses, Dissertations, and Problem Reports (ETD)

Five clay minerals (Well Crystallized Kaolinite (KWC), Poorly Crystallized Kaolinite (KPC), Illite, Attapulgite, and Montmorillonite) with a range of surface characteristics were selected to investigate the adsorption of three oxyanions (molybdate, selenite, and selenate). The minerals were coated with five different levels of each of Fe and Al hydrous oxides. The charge characteristics were determined using potentiometric titration. Adsorption was studied by batch experiment at 11 different concentrations of each of the oxyanions at three different pH levels. Coating with both Fe as well as Al hydrous oxide coatings raised the pH{dollar}\\sb{lcub}\\rm o{rcub}{dollar} (condition where mineral surface is electrically neutral) …

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The Persistence Of Radiation-Induced Chromosome Aberrations In Mice., Michelle Denise Spruill Jan 1997

The Persistence Of Radiation-Induced Chromosome Aberrations In Mice., Michelle Denise Spruill

Graduate Theses, Dissertations, and Problem Reports (ETD)

As translocations increase in popularity for use as a biodosimeter for prior radiation exposure, information on the possible decline of these 'stable' aberrations over time is desperately needed. This study is the first to assess the stability of radiation-induced chromosome aberrations in vivo over the life span of a rodent model. C57BL/6 female mice were given an acute dose of 0, 1, 2, 3 or 4 Gy {dollar}\\sp{lcub}137{rcub}{dollar}Cs of 8 weeks of age. Metaphase chromosome preparations were made from peripheral blood and bone marrow samples which were taken from 4 mice in each dose group at 1, 8, 15 and …

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Cell Cycle Regulation Of Redoxyendonuclease Activity In Human Neuroblastoma Cells., Deepika Walpita Jan 1997

Cell Cycle Regulation Of Redoxyendonuclease Activity In Human Neuroblastoma Cells., Deepika Walpita

Graduate Theses, Dissertations, and Problem Reports (ETD)

Redoxyendonuclease activity was detected in extracts of human neuroblastoma cells using a base-release assay specific for thymine glycol in DNA. The level of redoxyendonuclease activity was more than 2-fold higher in dividing cells compared to quiescent cells, suggesting that quiescent cells may have a reduced capacity to repair oxidative DNA base damages. Cells were synchronized by serum deprivation and then stimulated to enter the cell cycle by the addition of serum to determine enzyme activity at different stages of the cell cycle. The redoxyendonuclease activity was regulated in a biphasic manner with a peak in early G1 and a peak …

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Methane Oxidation And Respiration Of Methylococcus Capsulatus (Bath)., Scott Andrew Cook Jan 1997

Methane Oxidation And Respiration Of Methylococcus Capsulatus (Bath)., Scott Andrew Cook

Graduate Theses, Dissertations, and Problem Reports (ETD)

The membrane bound enzyme methane monooxygenase (pMMO), is a mixed function oxygenase that initiates the oxidative metabolism of methane in methanotropic bacteria. Copper is required for catalytic activity of pMMO, illustrated by the recovery of pMMO activity in EDTA-inhibited membranes, whereas zinc and nickel had little effect or were inhibitory. Inhibition kinetics, cosubstrate dependence, and substrate protection experiments show that acetylene acts as a suicide substrate for pMMO, binding specifically to a 26-kDa peptide. The acetylene binding capability of pMMO increased as a function of copper concentration as does the specific activity, suggesting that copper activates pMMO by binding to …

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Physical, Chemical, And Microbial Analysis Of Domestic Wastewater Treated By Small Constructed Wetlands Designed For Individual Households., Keith R. Hench Jan 1997

Physical, Chemical, And Microbial Analysis Of Domestic Wastewater Treated By Small Constructed Wetlands Designed For Individual Households., Keith R. Hench

Graduate Theses, Dissertations, and Problem Reports (ETD)

Many small communities located in rural areas of the United States lack adequate domestic wastewater treatment plants. Constructed wetlands are being promoted as low-cost, low-maintenance systems for treatment of domestic wastewater in areas where standard septic tanks fail. In order to evaluate the efficacy of small constructed wetlands, 20 small-scale wetlands mesocosms (100 gal each) containing five plant treatments (no plants/control, Typha, Scirpus, and Juncus monocultures, and all three species combined) were planted into pea gravel at either 18 or 24 inches in depth. Each mesocosm received 5 gal/day of primary-treated domestic sewage. Mesocosms were monitored on a monthly basis …

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Lived Experiences Of Male Nursing Students With Caring., Patricia Jean Young Jan 1997

Lived Experiences Of Male Nursing Students With Caring., Patricia Jean Young

Graduate Theses, Dissertations, and Problem Reports (ETD)

Fifteen male nursing students from four baccalaureate nursing schools in West Virginia participated in this phenomenological study. The phenomena of interest was the lived experiences of male student nurses related to caring. Demographic data was obtained in the interview process. Semistructured interview questions were used in the individual interviews, which were all audiotaped. The methodology used was based on the Swanson-Kauffman and Schonwald method, which entailed the four step process of bracketing, analyzing, intuiting, and describing. Five themes were identified. The Primacy of Caring was the first theme. Characteristics of caring, the origins of caring, the lived experiences of caring …

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Risk Based Analysis Of Levees., Anthony Lewis Brizendine Jan 1997

Risk Based Analysis Of Levees., Anthony Lewis Brizendine

Graduate Theses, Dissertations, and Problem Reports (ETD)

A multi-phased research program consisted of performance of both laboratory and field test programs, development of hydraulic conductivity probability density functions, and development of a first generation risk model to assess relative risk among groups of levees to determine rank for systemic allocation of scarce rehabilitation resources. The laboratory test program consisted of determining basic soil properties at four USACE WES REMR demonstration sites: Talulla, MS, Sny Island, IL, Skagit, WA, and Elkhorn, CA. Additionally, flexible wall hydraulic conductivity tests were performed with subsequent development of hydraulic conductivity probability density functions (PDF's). The field testing program consisted of conducting in …

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Intensive Supervised Probation And Institutional Placements For Adjudicated Youth: A Closer Look., Cleaster Marie Jackson Jan 1997

Intensive Supervised Probation And Institutional Placements For Adjudicated Youth: A Closer Look., Cleaster Marie Jackson

Graduate Theses, Dissertations, and Problem Reports (ETD)

With the alarming rate of school violence and teen crime public outcry demands that we look for immediate remedies to make schools and communities safe. One solution which has received public support is the current trend to solve this problem by building more juvenile facilities to house these youth. This short term fix, which has been referred to as an "out of sight out of mind mentality" creates other concerns such as loss of educational dollars to public schools and highlights the lack of commitment to provide effective programs to meet the needs of challenging students. The purpose of this …

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Regulation Of The Rpos Sigma Factor In Salmonella Typhimurium By Host Factor I, A Small Rna Binding Protein Encoded By Thehfq Gene., Larissa Carol Brown Jan 1997

Regulation Of The Rpos Sigma Factor In Salmonella Typhimurium By Host Factor I, A Small Rna Binding Protein Encoded By Thehfq Gene., Larissa Carol Brown

Graduate Theses, Dissertations, and Problem Reports (ETD)

We have found that Host Factor I (HF-I), the product of the hfq gene, is required for efficient expression of the RpoS stationary phase sigma factor in Salmonella typhimurium. HF-I is an RNA-binding protein originally characterized for its role in replication of phage Q{dollar}\\beta{dollar} of E. coli. Its role in the uninfected bacterial cell has previously been unknown. Assays of {dollar}\\beta{dollar}-galactosidase in strains with rpoS-lac fusions, Western blot analysis, and pulse-labeling and immunoprecipitation of both fusion proteins and native RpoS show that an hfq mutant has a four- to seven-fold reduction in the translation of rpoS. Suppressor mutations were isolated …

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Crime And The Nation: Prison Reform And Popular Fiction In Philadelphia, 1786-1800., Peter Thomas Okun Jan 1997

Crime And The Nation: Prison Reform And Popular Fiction In Philadelphia, 1786-1800., Peter Thomas Okun

Graduate Theses, Dissertations, and Problem Reports (ETD)

The prison reformers and fiction writers of post-Revolutionary Philadelphia wrote prodigiously about crime and punishment. In a correlative study, I explore juridical topoi in reformist and fictive texts familiar to republican Philadelphians. My analysis assumes a public sphere of writers and readers: while late eighteenth-century prison reforms and fictions came out of separate signifying systems, there was considerable promiscuity between them. I group areas of overlap around cultural concerns (science, murder, sex) and representational "spaces" (home, prison, nation). In either discourse, crime and punishment were useful to a post-Revolutionary aesthetic of nationalism. The scientific rhetoric of penitentiary punishment targeted the …

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Postsecondary Persistence Of Ged Students., Maria C. Rose Jan 1997

Postsecondary Persistence Of Ged Students., Maria C. Rose

Graduate Theses, Dissertations, and Problem Reports (ETD)

More nontraditional students are attending college, and many of these students are enrolled with GED certification. The validity using GED certification as postsecondary admission criteria has been questioned. Participants included 251 students enrolled with GED certification as admission criteria to a small Mid-Atlantic college in the Spring 1997 semester. The influence of ACT, GED, literacy scores, learning and study skills, and the number of successfully completed developmental classes on grade point averages was researched. Students were interviewed to gain insight into students' perceptions of factors contributing to persistence in college. ACT scores were found to be good predictors of grade …

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The Effect Of Estrogen On The Transcriptional Regulation And The Chromatin Remodeling Of The Very Low Density Apolipoprotein Ii Gene., Elizabeth Mambo Jan 1997

The Effect Of Estrogen On The Transcriptional Regulation And The Chromatin Remodeling Of The Very Low Density Apolipoprotein Ii Gene., Elizabeth Mambo

Graduate Theses, Dissertations, and Problem Reports (ETD)

The chicken very low density apolipoprotein II (apoVLDLII) gene encodes an egg yolk protein that is synthesized in the liver in response to estrogen. Regulation of this gene is mediated by the estrogen receptor via two estrogen response elements (EREs) located in the promoter. Following the administration of estrogen, there is a four hour lag period prior to the detection of apoVLDLII mRNA. To examine the events that occur during this lag period, in vivo footprinting and run-on transcription assays were performed. Time courses of the transcription of the apoVLDLII gene were done using the transcription run-on assay. The antisense …

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Effects Of Pattern Of Fsh On Follicular Growth And Ovulation And Relationships Between Histamine And Plasminogen Activator In The Ovulatory Process Of Gilts., David Jeffrey Wright Jan 1997

Effects Of Pattern Of Fsh On Follicular Growth And Ovulation And Relationships Between Histamine And Plasminogen Activator In The Ovulatory Process Of Gilts., David Jeffrey Wright

Graduate Theses, Dissertations, and Problem Reports (ETD)

Whether growth of large, ovulatory follicles differed after different modes of stimulation with FSH and whether growth was enhanced by exogenous LH were examined in prepubertal gilts. Gilts received either a single injection of 2 mg FSH at 0 h (SUPER-OV; AUSA International, Inc., Tyler, TX) or injections every 8 h (18 mg over 64 h) and either 10 {dollar}\\mu{dollar}g porcine LH (USDA-pLH-B2; Animal Hormone Program, Beltsville, MD.) with the first injection of FSH (n = 4 and 3, respectively) or no LH (n = 3 each). Number of follicles {dollar}\\geq{dollar}7 mm in diameter and ovarian weight did not differ …

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Family Firo Model Perspectives On Physical Spouse Abuse: An Exploratory Study., Antoinette Sgarlata Wiseman Jan 1997

Family Firo Model Perspectives On Physical Spouse Abuse: An Exploratory Study., Antoinette Sgarlata Wiseman

Graduate Theses, Dissertations, and Problem Reports (ETD)

Control is often a central concept in the explanation and treatment of physical spouse abuse. This study examined the usefulness of W. J. Doherty's and N. Colangelo's Family FIRO Model in explaining issues of control in physically aggressive couple relationships. The model is an adaptation of W. Schutz's Fundamental Interpersonal Relations Orientation theory, which predicts the interpersonal fit in relationships from the satisfaction of the partners' intrapersonal inclusion, control, and affection needs. In further describing these needs, Doherty and colleagues place issues related to control in separate need areas, which could affect the initial focus of treatment. Thirty couples recruited …

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An Advocacy Coalition Approach To A Study Of The Politics Of Education In Tennessee., Patricia Ehle Ceperley Jan 1997

An Advocacy Coalition Approach To A Study Of The Politics Of Education In Tennessee., Patricia Ehle Ceperley

Graduate Theses, Dissertations, and Problem Reports (ETD)

This was an instrumental case study that examined the extent to which the politics of education in Tennessee that resulted in the passage of the Education Improvement Act of 1992 and related tax increases conformed to the assumptions of the Advocacy Coalition Framework as articulated by Sabatier. The framework viewed education policy change as the result of the interaction of (a) competing advocacy coalitions within a policy subsystem over a decade or more, (b) changes that are external to the policy subsystem, and the (c) effects of stable system parameters. The researcher used a snowballing technique to identify 12 key …

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The Relationship Between Brain Hemispheric Characteristics And Leadership Style Of School Superintendents In West Virginia., Theodora Sinicrope Farmer Jan 1997

The Relationship Between Brain Hemispheric Characteristics And Leadership Style Of School Superintendents In West Virginia., Theodora Sinicrope Farmer

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study was designed to examine the relationship between the self-perceived preferred brain hemispheric processing of West Virginia public school superintendents and their self-perceived leadership styles. Respondents completed the Hermann Brain Dominance Profile, the Leader Behavior Description Questionnaire, and a demographic sheet. Data were analyzed using the General Linear Model of the Statistical Analysis System (SAS). Two hypotheses guided the study. West Virginia public school superintendents who perceive themselves as preferring predominantly left hemispheric processing will have significantly higher Initiating Structure scores than superintendents who perceive themselves as predominantly right hemispheric. West Virginia public school superintendents who perceive themselves as …

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A Prospective Self-Monitoring Investigation Of Naturally Occurring Reinforcement Of Exercise Behavior., Leighann Hock Forsyth Jan 1997

A Prospective Self-Monitoring Investigation Of Naturally Occurring Reinforcement Of Exercise Behavior., Leighann Hock Forsyth

Graduate Theses, Dissertations, and Problem Reports (ETD)

The present investigation was based on operant theory. A prospective six-week self-monitoring design was utilized to examine naturally-occurring reinforcing and punishing effects of cardiovascular exercise in a college-aged sample of healthy women. The sample consisted of exercise initiators ({dollar}{dollar}6 months of regular exercise). Seven rewarding exercise effects emerged from factor analysis of the self-monitoring form (i.e., mood improvement, goal achievement, physical performance enhancement, exercise "high", praise from others, social affiliation, and appearance changes). Results indicated that both groups produced similar ratings for the exercise reward factors, but some factors were significantly more rewarding than others to the sample as a …

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The Role Of Endothelin In Hexachloro-1,3-Butadiene-Induced Acute Renal Failure., Lara Kristen Dowland Jan 1997

The Role Of Endothelin In Hexachloro-1,3-Butadiene-Induced Acute Renal Failure., Lara Kristen Dowland

Graduate Theses, Dissertations, and Problem Reports (ETD)

The objective of this research was to determine if endothelin is a mediator of hexachloro-1,3-butadiene (HCBD)-induced acute renal failure. The nephrotoxicity associated with HCBD is acute tubular necrosis (ATN). HCBD-induced ATN is characterized by a decrease in renal blood flow (RBF), mediating a decline in the glomerular filtration rate (GFR), polyuria, glucosuria, proteinuria and natriuresis. These effects on the kidney are mimicked by the endogenous peptide endothelin. Endothelin is produced by many different cell types and is the most potent endogenous vasoconstrictor peptide identified to date. The renal vasculature is particularly sensitive to the vasoconstrictive action of endothelin. Endothelin causes …

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The Use Of Simplified English To Improve Task Comprehension For Non-Native English Speaking Aviation Maintenance Technician Students., Douglas Eckert Jan 1997

The Use Of Simplified English To Improve Task Comprehension For Non-Native English Speaking Aviation Maintenance Technician Students., Douglas Eckert

Graduate Theses, Dissertations, and Problem Reports (ETD)

The objective of this research was to determine if the use of Simplified English (SE) improved task comprehension of non-native English speaking aviation maintenance technician students in a non-English speaking environment. A background questionnaire, one test, and four controlled language instruments were administered to each subject. The test, Accuracy Level Test (ALT) by Ronald P. Carver, measured the Spanish subjects English reading ability by grade level. The four instruments were aviation maintenance task cards and tests developed by Boeing Aircraft which measured subject comprehension of maintenance procedures. The participants were 148 Mexican aviation maintenance technician students, mechanics, and instructors from …

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The Medical Treatment Preferences And Values Of Nursing Home Residents., Natalie Dawn Staats Jan 1997

The Medical Treatment Preferences And Values Of Nursing Home Residents., Natalie Dawn Staats

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study was designed to accomplish seven goals. First, the preferences of nursing home residents for life-sustaining treatments and less acute medical problems were examined. Second, analyses were conducted to determine whether specific variables differentiated between participants' patterns of treatment preferences. Third, participants' medically-related values were examined. Fourth, the factors believed to play a role in the formation of participants' treatment preferences and values were examined. Fifth and sixth, the temporal stability of participants' treatment preferences and values was examined. Seventh and eighth, factors associated with the instability of participants' treatment preferences and values were studied. To accomplish these goals, …

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Recruiting Retirees For Economic Development: A Public Policy Perspective., Michele Louise Kreidler Jan 1997

Recruiting Retirees For Economic Development: A Public Policy Perspective., Michele Louise Kreidler

Graduate Theses, Dissertations, and Problem Reports (ETD)

This paper examines retiree recruitment as a strategy in state economic development policy. The study employs a theoretical framework of policy adoption and lesson-drawing to answer the questions (1) why would a state adopt the policy of retiree recruitment and (2) how is the policy adopted. Three states in different stages of retiree recruitment policy adoption were selected as case studies. Results show that different strategies in policy adoption were operating in each case study state. In each state development of retiree recruitment was in response to a need to diversify the state economy. The idea of retiree recruitment originated …

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Portrayal Of Teacher Image: An Exploration Of Perceptions And Behaviors Of Healthcare Educators., Carole Shockey Thomassy Jan 1997

Portrayal Of Teacher Image: An Exploration Of Perceptions And Behaviors Of Healthcare Educators., Carole Shockey Thomassy

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this study was to explore and describe the image healthcare educators believed they portrayed as a teacher and the behaviors they believed actualized the image. A pilot study was completed to evaluate the data collection techniques. A purposive sample of healthcare educators participated in one-to-one semi-standardized interviews and was observed in a teaching situation for demonstration of self-identified behaviors they believed actualized their image. Thematic analysis of the data resulted in five categories: coming to the role, perceptions held by subjects regarding image, people who may have influenced the image, behaviors that actualized the image and self-perceived …

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Chromatin Structure Of Mag Gene Regulatory Region., Iwona Hirschler-Laszkiewicz Jan 1997

Chromatin Structure Of Mag Gene Regulatory Region., Iwona Hirschler-Laszkiewicz

Graduate Theses, Dissertations, and Problem Reports (ETD)

Myelin associated glycoprotein (MAG) plays an important role in myelinogenesis, nerve plasticity and nerve regeneration. Hence, knowledge of how this gene is regulated may be essential for developing clinical strategies, e.g., to promote regeneration in the injured spinal cord. We employed the primer extension technique for mapping MAG gene transcription start sites. The analysis revealed 13 transcription start sites spanning 72 bp. No canonical TATA box and no known transcription initiator (Inr) sequences that position transcription complex in other TATA-less promoters were found. The structure of chromatin associated with the MAG gene was analyzed using progressive micrococcal nuclease digestion of …

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Square Wave Cathodic (Adsorptive) Stripping Voltammetry Of Selenium, Arsenic, Vanadium, And Molybdenum., Hong Li Jan 1996

Square Wave Cathodic (Adsorptive) Stripping Voltammetry Of Selenium, Arsenic, Vanadium, And Molybdenum., Hong Li

Graduate Theses, Dissertations, and Problem Reports (ETD)

The determination of selenium(IV), arsenic(III), vanadium(V), and molybdenum(VI) at sub-nanomolar to picomolar levels has been investigated with square wave cathodic stripping voltammetry (SWCSV) and square wave adsorptive stripping voltammetry (SWAdSV). Se(IV) and As(III) form intermetallic compounds with copper and are deposited at a hanging mercury drop electrode (HMDE). V(V) and Mo(V) form dihydroxynaphthalene (DHN) complexes which can be adsorbed at an HMDE. The reduction currents for the complexes are greatly enhanced by coupling a catalytic effect of bromate, and reaction mechanisms are reported. Generally, square wave voltammetry gives either better or similar sensitivity to linear scan and differential pulse voltammetry. …

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Mitigation Of Blast Effects With Geogrid-Reinforced Soil Backfills., Alan Paul Ohrt Jan 1996

Mitigation Of Blast Effects With Geogrid-Reinforced Soil Backfills., Alan Paul Ohrt

Graduate Theses, Dissertations, and Problem Reports (ETD)

Several military attack scenarios involve the detonation of explosive in the soil backfill surrounding a target structure. In this study, experiments and numerical simulations were performed to determine if the enhanced mechanical properties of geogrid-reinforced soil backfills could mitigate blast effects from buried explosions. The dynamic response of an explosively-loaded, geogrid-reinforced sand was successfully characterized, identifying and quantifying certain blast mitigating effects. Six high explosive experiments were conducted, each involving a 0.91 kg nitromethane explosive charge placed at 76.2 cm depth within a test pit of compacted fill. Two experiments were unreinforced, serving as control tests. Three experiments were conducted …

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Use Of Prefabricated Vertical Drains (Pvds) For Enhanced Soil Flushing., John Dante Quaranta Jan 1996

Use Of Prefabricated Vertical Drains (Pvds) For Enhanced Soil Flushing., John Dante Quaranta

Graduate Theses, Dissertations, and Problem Reports (ETD)

The concept of using prefabricated vertical drains (PVDs) for remediation of contaminated sites with fine-grained soils is examined. The PVD system is used to shorten the drainage path of the groundwater flow and promote subsurface liquid movement expediting the soil flushing process. The use of PVDs in the current state of practice has been limited to soil improvement. The use of PVDs under vacuum conditions is investigated using study soils consisting of 100% sand and 80% sand/20% kaolinite mixture. PVD parameters evaluated included: Well Resistance, Zone of Influence, and Smear Effects. Applicability of the PVD soil flushing was evaluated through …

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