Digital Commons Network^™

The Uneasy Triangle The Impact Of China On U.S.-Soviet Relations In The 1970'S Salt: A Case Study, Karen Elizabeth Toenjes

Graduate Program in International Studies Theses & Dissertations

No abstract.

A Survey Of Burnout Among Dental Hygiene Educators, Sandra Boggs Ricks

Dental Hygiene Theses & Dissertations

A survey was conducted on 159 full-time dental hygiene educators in order to collect data on job satisfaction, morale, and perceived institutional/program effectiveness. Educators were chosen for the study by cluster sampling from two- and four-year accredited dental hygiene programs in the United States. The programs were selected at random from stratified groups according to type of institutional setting. Participants were asked to complete a questionnaire which contained four major sections: demographic data, job satisfaction, institutional/program effectiveness, and feelings related to their position. Findings were analyzed utilizing contingency tables and Chi-Square analysis. No attempt was made to establish a cause …

The Effects Of X-Irradiation On The Metamorphosis And Budding Of Aurelia Aurita, Michael John Prokopchak

OES Theses and Dissertations

With the aid of the Aurelia Metamorphosis Test System, the acute or subtle morphological and behavioral effects of irradiation on the Norfolk Aurelia aurita were described and the sensitivity to X-irradiation of those organisms receiving thyroxine and those not receiving thyroxine was compared. Levels of radiation were 0 (control), 5,000, 10,000, 15,000, 20,000 and 40,000 rads. Morphology of the ephyrae, statolith and rhopalia numbers were recorded using the light microscope, Developmental abnormalities of the scyphistomae and ephyrae were recorded with the scanning electron microscope and light microscope. Two major findings from this investigation were the absence of rhopalia and statoliths …

The Great Day: A Fantasy Play In Five Acts, Six Scenes By Vladimir Kirshon, Christopher Lee Philips

Institute for the Humanities Theses

Vladimir Kirshon was a proletarian playwright of the Soviet Union who died in the Great Purge. The thesis presents an English version of the author's last play, The Great Day, which is preceded by an introduction which places Kirshon and his plays in their proper historical context. The introduction details Kirshon's political and artistic background and his politico-literary position as a playwright. The introduction and analysis of the play produce an understanding of Vladimir Kirshon as a Soviet proletarian playwright and an understanding of the spirit in which The Great Day was written.

Correlation Studies Between Human Seminal Plasma Trace Metal Concentrations And Semen Quality, De-Shen Mei

Chemistry & Biochemistry Theses & Dissertations

Methodologies for the determination of cadmium, copper, selenium and zinc concentration in human seminal plasma have been developed using polarized Zeeman-effect atomic absorption spectroscopy. Within-run coefficients of variation (CY's) for cadmium, copper, selenium and zinc from pooled seminal plasma were found to be 8%, 5% , 4% and 0.5% at a mean (SD) concentration of 0.48 (0.04), 147 (7 .6), 53 (2. 1) and 122,900 (700) μg/ℓ, (n = 10), respectively.

Between-run CV's were determined to be 4% , 7%, 5% and 7% at a mean (SD) concentration of 2.4 (0.1), 147 (10. 1), 67.7 (3.4) and 115,800 (8300) …

Negative Cooperatively In The Binding Of 3-Aminopyridine Adenine Dinucleotide To L-Α-Glycero-3-Phosphate Dehydrogenase, David Wheeler

Chemistry & Biochemistry Theses & Dissertations

Glycerol-3-phosphate dehydrogenase catalyzes the reversible reaction:

NAD⁺ + G-3-P ⇌ NADH + DHAP + H⁺

The enzyme is found in organisms from E. coli to man. The primary function of the enzyme varies from organism to organism. Depending on the metabolism of the organism, the enzyme may function primarily to generate G-3-P for lipid (in organisms with a highly aerobic biosynthesis metabolism), or it may function primarily to produce NAD⁺ to support glycolysis. Complex multicellular organisms possess tissue specific isozymes of GPDH whose kinetic parameters reflect the relative importance of G-3-P and NAD⁺ production in various …

Tectonic Implications Of Late Tertiary Strata Exposed Along The Piankatank River, Eastern Virginia, Daniel Stephen Lane

OES Theses and Dissertations

Biostratigraphic analysis of Late Miocene and Pliocene strata along the Piankatank River in eastern Virginia exposes a juxtaposition of the Eastover and Yorktown Formations. This structure is situated on a NE trending alignment of geological, geomorphic, and geophysical features which run from southern Virginia to northern Delaware. Tectonic jointing in isolated sandstone bodies and fracture controlled drainage patterns provide further evidence of post-middle Pliocene tectonism in the region. The lateral spacing of this structure from the Stafford and Brandywine fault zones and other linear features on the Coastal Plain strongly implies that a structural similarity exists between the Piankatank structure …

Numerical Experiments With The Quasigeostrophic Potential-Vorticity Equation, Peter L. Spence

OES Theses and Dissertations

A method is developed to model the circulation of a barotropic, 8-plane ocean under an imposed steady wind stress. The model includes the effect of both horizontal and vertical friction along with nonlinear advection of vorticity. Implementing the method involves solving the unsteady quasigeostrophic potential-vorticity equation using a compact finite difference scheme (Gatski, Grosch, and Rose, 1982).

Once developed, this model is used in four separate numerical experiments. In each experiment, a model ocean with an initial flow field is driven to a steady state solution. Vertical viscosity is held constant in the first three experiments while lateral viscosity is …

Stratigraphy And Textural Analyses Of A Beach Ridge Complex, Cape Henry, Virginia, Daniel Leland Oyler

OES Theses and Dissertations

Eight lithological units, documented from the analyses of 26 boreholes, comprise five laterally extensive horizons in the subsurface of Cape Henry, Virginia. Interpretations of the environments of deposition for those units are based upon textural and compositional features, fossils, thickness and distribution of strata, and previous reports about late Tertiary and Quaternary deposits in nearby areas. The incised, Pliocene Chowan River Formation (Unit H) underlies Pleistocene Units F and G which are concentrated in a buried river valley beneath Cape Henry. Estuarine Units D and E resulted from a marine transgression of the study area during the early Holocene. The …

Demographic Analysis And Microhabitat Relationships Of A Small Mammal Community In Clearings Of The Great Dismal Swamp, Jean Ferguson Stankavich

Biological Sciences Theses & Dissertations

Small mammals were trapped for 14 months on two grids located within a powerline right-of-way in the Great Dismal Swamp National Wildlife Refuge. During 12,354 trap nights, individuals of 10 different species were captured. They included, from highest to lowest density, Reithrodontomys humulis, Ochrotomys nuttalli, Peromyscus leucopus, Blarina brevicauda, Synaptomys cooperi, Microtus pennsylvanicus, Microtus pinetorum, Sigmodon hispidus, Mus musculus and Oryzomys palustris. The demography (densities, reproduction, home range and dispersal) of each species was analyzed when possible. Most of the species were present in relatively low densities, with a number being captured only during the latter months of the study. …

The Gift Of The Gods: The Impact Of The Korean War On Japan, John P. Bowen

Graduate Program in International Studies Theses & Dissertations

The Korean War was a benchmark in the modern history of Japan. It became a catalyst for political action, and the fountainhead of the "economic miracle" that raised Japan once again to a prominent position among nations. The Korean War helped solve many political problems, including the tricky question of a peace treaty. It confirmed Japan's commitment to a no-war constitution. It also permitted the Japanese government to relax the restrictions imposed by occupation authorities. The war created a fortuitous economic stimulus that permitted Japan to emerge from the recessionary period that followed World War II and to establish the …

I.G. Farben's Petro-Chemical Plant And Concentration Camp At Auschwitz, Robert Simon Yavner

History Theses & Dissertations

This study examines the history of the petrochemical plant and concentration camp run by I.G. Farbenindustrie (the dominant German chemical company during World War II) at Auschwitz to decide upon the degree of Farben’s involvement with Hitler and the Holocaust. The study traces the construction of the plant to determine Farben's participation at Auschwitz. The main sources consulted were the transcripts of the postwar Farben trial at Nuremberg along with eyewitness accounts of members of the prosecution staff. Based on the court's verdict, one might conclude that I.G. Farben operated in a state of coercion during the war and could …

Triple Trigonometric Series And Their Application To Mixed Boundary Value Problems, Gordon Melrose

Mathematics & Statistics Theses & Dissertations

In this dissertation the author investigates some triple trigonometric series which occur in the solution of mixed boundary value problems in elasticity and potential theory. By choosing a suitable integral representation for the sequence of unknown constants, the problem is reduced to solving a singular integral equation of the first kind. Twenty four cases in which the integral equation can be solved in closed form are discussed in detail.

In later chapters, the application of triple trigonometric series to problems in physics and engineering is demonstrated and closed form solutions for the physical parameters of interest are obtained.

Estimating The Parameters Of Truncated Distributions, Mukul Mohan Mittal

Mathematics & Statistics Theses & Dissertations

The problem considered here is the estimation of the parameters of some special truncated distributions. If the sample observations are restricted to the interval {O, T} with T known, then it is well known in the literature that the method of maximum likelihood fails to provide a finite estimate, for the mean of an exponential distribution, whenever the sample mean is greater than T/2 (Deemer and Votaw, 1955, Ann. Math. Statist. 26, 498-504). Not so well known is the nonexistence of the maximum likelihood estimator (m.l.e.), under certain conditions, for the scale parameter of a gamma distribution from a truncated …

Studies On The Interference Of Wings And Propeller Slipstreams, Ramadas K. Prabhu

Mechanical & Aerospace Engineering Theses & Dissertations

The small disturbance potential flow theory is applied to determine the lift of an airfoil in a nonuniform parallel stream. The given stream is replaced by an equivalent stream with a certain number of velocity discontinuities, and the influence of these discontinuities is obtained by the method of images. Next, this method is extended to the problem of an airfoil in a nonuniform stream of smooth velocity profile. This model allows perturbation velocity potential in a rotational undisturbed stream. A comparison of these results with numerical solutions of Euler equations indicates that, although approximate, the present method provides useful information …

Factors Influencing College Choice Of Minority Students And Their Implications For Recruitment, Linda Blount Mccluney

Theses and Dissertations in Urban Services - Urban Education

This study was designed to determine factors of college choice and to evaluate their implications for the development of recruiting guidelines for minority students. The intent was to survey two hundred freshmen of two urban universities to determine which factors were influential in their college choice process and to design recruiting guidelines. The use of these guidelines may provide the impetus to direct more blacks to predominantly white urban universities and more whites to predominantly black universities.

The criterion group approach allowed for the two groups (black students attending a predominantly white university versus black students attending a predominantly black …

A Comparison Of Parenting Profiles Of Adolescent Mothers, Willar F. White-Parson

Theses and Dissertations in Urban Services - Urban Education

Statement of Problem. How do parenting profiles of adolescent mothers who attended an alternative school for pregnant students compare with adolescent mothers who did not attend this school?

Purpose. The purpose of this study was to compare the parenting perceptions of adolescent mothers who attended an alternative school for pregnant students and adolescent mothers who did not attend this school.

Procedure and Methods. The sample for this quasi-experimental study consisted of twenty volunteers who were enrolled in an alternative school and twenty volunteers who were admitted to a general hospital in Norfolk, Virginia. The school samples was the experimental group …

Orthodontists' Attitudes Toward Expanding Career Opportunities For The Dental Hygienist In Orthodontics, Julie A. Foster

Dental Hygiene Theses & Dissertations

The purpose of this survey was to determine attitudes of orthodontists toward employing dental hygienists. A self-designed, 33 item questionnaire was used to obtain descriptive data. The questionnaire was mailed to a random sample of orthodontists chosen from the United States portion of the Orthodontic Directory of the World (N=500). Data were obtained from 298 orthodontists for a 58.6 percent response rate.

The study suggests that although orthodontists believe dental hygienists are important oral health professionals (96.2 percent) and important parts of the orthodontic practice (32.6 percent), only 10.9 percent of orthodontists surveyed employ dental hygienists. Factors determined to be …

An Experimental And Analytical Investigation Of The Iosipescu Shear Test For Composite Materials, Barry Stuart Spigel

Mechanical & Aerospace Engineering Theses & Dissertations

Mechanical properties of composite materials under shear loading are difficult to determine. The Iosipescu Shear test, originally proposed for metals, has in recent years been applied to composites. It has the advantages of small specimen size, simple loading and a reasonably uniform shear stress in the test section.

The purpose of this work is to study the validity of the Iosipescu test method for measuring the shear modulus and shear strength of composites. Finite element analyses indicate that optimum specimen geometry and load locations depend upon the degree of orthotropy of the composite. Test results for a quasi-isotropic graphite/epoxy laminate …

Activity Levels Of Arboreal Rodents Peromysus And Ochrotomys Evaluated With Nest Cans In Seasonally Flooded Forests, John W. Walke

Biological Sciences Theses & Dissertations

The diversity and density of small mammals in the Dismal Swamp are believed to be small. To test this, four 1.96 ha grids were established and operated in the Dismal Swamp National Wildlife Refuge, from September 1981 to November 1982. Number 10 metal cans covered with plastic lids were placed as nest boxes at 0.5 to 1.5 m height on trees. A 2.5 cm hole allowed access by arboreal rodents, to each nest can. The activity level of the two arboreal rodents, Peromyscus leucopus and Ochrotomys nuttalli, was evaluated by observing types of activity ranging from presence of mice to …

Determination Of The Internal Rotational Energy Of Gaseous 1,2-Dichloroethane In An Argon Matrix Using Fourier Transform Spectroscopy, Susan Lynn Clarke

Chemistry & Biochemistry Theses & Dissertations

A sample cell and delivery system for rapid matrix isolation of gas mixtures at constant gas temperature was designed and evaluated. The rotational energy differences of 1,2-dichlorosthane and of its deuterium compound wars then determined to test this technique.

The rotational energy barriers calculated from Boltzman plots of ths gases at different temperatures were; 1.21 + 0.38 keel/mole, 1.33 + 0.70 Real/mole, and 1.12 + 0.45 kcal/mole for the CH2 wagging„ C-Cl stretching and CD₂ wagging modes respectively. These values were in good agreement with previously published values.

These results allowed evaluation of this apparatus and experimental design and …

Characterization Of Trihalomethane Formation From Proteins In Chlorinated Water, Robert Aaron Kravitz

Chemistry & Biochemistry Theses & Dissertations

Traditionally humates have been considered the most significant precursor in the formation of trihalomethanes in finished drinking water. This study investigates another potential precursor, namely proteins. The chlorination of aqueous protein solutions yields significant levels of trihalomethanes in terms of the maximum contaminant level (MCL) of 0.100 mg/L imposed by the USEPA. Molar yields for several proteins were determined. The average yield per unit of organic carbon was 0.5% as compared to 0.8% for a humic acid studied. A model protein, bovine serum albumin, was studied extensively to ascertain the effects of total organic carbon, chlorine dose, and time on …

Two-Dimensional Electrophoretic Studies Of Normal Spematozoal Proteins, Ying Lin

Chemistry & Biochemistry Theses & Dissertations

Protein profiles of human spermatozoa have been mapped by using high resolution two-dimensional electrophoresis which combines isoelectric focusing as the first dimension and polyacrylamide gradient gels electrophoresis in SDS as the second dimension. The profiles of normal spermatozoa! extraction, acrosomal extraction and seminal plasma showed high resolution in its separation capability. No qualitative or quantitative differences were observed by using Coomassie Brilliant Blue R-250 staining in a much higher concentration of proteins. However, coomassie blue lacks the sensitivity to detect many minor components. Therefore, a silver staining procedure was used, which resulted in greatly increased sensitivity.

Samples from normal fertile …

Fourier Series Analysis Of The Relationship Of Morphologic Variations And Bathymetry In Recent Bolivina (Foraminiferida) From The Northwestern Gulf Of Mexico, Anthony Cavedo Gary

OES Theses and Dissertations

Automated video digitization and closed-form Fourier series analysis were used to investigate the applicability of benthic foraminiferal test morphology for paleo-bathymetric/paleoenvironmental reconstructions. Sample relationships and harmonics with the greatest power for discriminating between samples were determined using canonical discriminant analysis. Samples were eleven short cores obtained from the northwestern Gulf of Mexico. Three species of Bolivina were analyzed, B. albatrossi, B. lowmani, and B. subspinescens.

Results show populations of Bolivina albatrossi from the upper bathyal and upper-middle bathyal zones to have more triangular tests and lobulate chambers than lower-middle and lower bathyal zone populations. Specimens of Bolivina subspinescens …

The Spatial And Temporal Distribution Of The Larvae Of Sympatric Pagurid Hermit Crabs (Decapoda, Anomura) In Virginian Estaurine And Coastal Waters, Philip Wesley Sadler

OES Theses and Dissertations

Thirteen stations were occupied at two - week intervals from May through September 1980 within the York River, lower Chesapeake Bay depths encompassing the entire water column.

Three species of pagurids were identified: Pagurus longicarpus, P. pollicaris, and P. annulipes. The larvae of P. annulipes had not been previously identified from Virginian waters. The shapes of the antennae of P. pollicaris and P. annulipes weredistinctive, allowing rapid identification of these larvae. The shapes of the uropods were found to be useful in distinguishingthe glaucothoe· of P. longicarpus from P. annulipes. The larvae of these species …

The Effects Of Tri-O-Cresyl Phosphate On 2',3'-Cyclicnucleotide-3'-Phosphohydrolase Activity In Neural And Non-Neural Tissue Of The Rat, Mark K. Schlager

Chemistry & Biochemistry Theses & Dissertations

A total of 44 Long-Evans rats received 5.7 g/kg tri-O-cresyl phosphate (TOCP) orally every 3 days for 6 days. A second group of 13 rats received 4.6 g/kg orally every 3 days for 6 days. Animals were administered atropine sulfate (10 mg/kg) intraperitoneally every 6 hours or as needed to alleviate cholinergic symptoms. Ten control animals were given corn oil orally. Eight rats (18%) survived the 5.7 g/kg dose regimen and 5 rats (38%) survived the 4.6 g/kg dose regimen. Surviving rats were killed at 30-33 days post-dose. Signs of delayed neuropathy included ataxia and motor impairment.

The CNP activity …

Germination And Host Range Of Branched Broomrape (Orobanche Ramosa) From Texas, Robert D. Coffin

Biological Sciences Theses & Dissertations

The effect of temperature on the germination of Orobanche ramosa L., branched broomrape, was investigated by dividing the physiological stages leading to germination into discrete events: pretreatment, a period when the seed becomes receptive to stimulant, and posttreatment, when stimulant application (GR-24) induces germination. Seed was pretreated and posttreated at 16 different temperature combinations. Optimal pretreatment was at 15°C and 18°C, maximum posttreatment at 18°C. Highest germination was obtained by pretreating and posttreating seed at 18°C, lowest at 24°C. The effect of different pretreatment regimes was tested. Seeds were pretreated over moist filter paper and in soil for Oto …

Determinants Of Variation In Avian Mobbing Behavior, Charles Ray Chandler Jr.

Biological Sciences Theses & Dissertations

Using three combinations of two experimental stimuli, I initiated mobbing behavior in various species of birds. The objectives of this research were to test the effects of stimuli on mobbing, the predictions of the hypothesis that mobbing functions to drive a predator away, and the effect of other species and individuals on the mobbing behavior of a bird. Mobbing experiments were conducted in a variety of habitats and locations from January 1983 through February 1984.

Only 6.5% of all trials with the mount-only stimulus were successful in attracting birds. Tape-only and mount-and-tape stimuli were equally effective in attracting birds, but …

Life History Aspects Of Reithrodontomys Humulis In Southeastern Virginia, Michelle Cawthorn Chandler

Biological Sciences Theses & Dissertations

Reithrodontomys humulis, the eastern harvest mouse, is a small cricetid rodent which is common in old field communities in the eastern U.S. A live-trapping study was conducted in Suffolk, Virginia from March 1983 through February 1984 in order to learn the details of its life history and the vegetational characteristics which best describe its microhabitat. Specifically, population densities, trap-revealed survival times, home ranges, plant species composition of the study area, and vegetational structure were examined. In order to trap as many Reithrodontomys as possible, special traps which excluded animals weighing over 20 g were constructed. Densities of harvest mice …

The Role Of Colonization Predation And Season In Determining Macroinvertebrate Community Structure In A Temperate Lake, Cheryl Lynn Frew

Biological Sciences Theses & Dissertations

Field experiments were conducted to examine the effects of distance from shore, vertebrate predation, and season on macroinvertebrate colonization dynamics in a temperate lake in Suffolk, VA. In a year-long colonization study, artificial plants, half of which were caged to exclude vertebrate predators, were deployed in patches at three distances from shore (2m, 15m, 50m). Artificial plant subsamples were removed at weekly intervals over 28 days during four seasons to monitor colonization by macroinvertebrates. Colonization of artificial plants occurred more quickly in the summer and spring than in fall and winter. The interactive effect of distance from shore and cage …