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Some Effects Of The Polychaete Nereis Succinea Frey And Leukart 1847 On The Distribution Of Copper Cadmium And Zinc In Sediments And Water, Gabriela Kitzig August

OES Theses and Dissertations

Two laboratory experiments, each lasting 216 hours, were conducted in order to determine the effects of a burrowing polychaete, Nereis succinea Frey and Leukart, 1847, on the distribution of copper, cadmium, and zinc in sediments and water in environmentally controlled microcosms. Dissolved metal concentrations in microcosms containing worms (experimental) decreased more rapidly than in microcosms without worms (controls). From 72 hours to 216 hours, suspended metal concentrations in experimental microcosms increased while concentrations in controls remained relatively constant. Sediment cadmium concentrations in experimental microcosms increased more over time than in controls. Polychaetes accumulated significant amounts of all three metals. These …

Morphological Variation Of The Foraminifer Elphidium Excavatum (Terquem) On Crumps Bank And Willoughby Bank, Chesapeake Bay, Virginia, Pamela Kay Painter

OES Theses and Dissertations

Six variants of the highly variable foraminiferal species, Elphidium excavatum (Terquem) were recognized in the Crumps Bank and Willoughby Bank areas of the southern Chesapeake Bay. Measurements of the size of the test, the number of chambers, the number of umbilical bosses, and the number and average length of the sutural bridges on the last formed chamber, and opaqueness or translucence of the test were made on 30 specimens from each of 36 stations selected for differences in environmental parameters. The measurements were statistically analyzed by discriminant analysis to test the hypothesis that the variants are distinct morphotypes and to …

Dental Hygiene Students' Perceptions About The Behavioral Characteristics Of The Effective Clinical Teacher, Frances Gaby Carson

Dental Hygiene Theses & Dissertations

A descriptive research approach and a self-designed questionnaire were used to obtain information about the effective clinical teacher as perceived by first and second year dental hygiene students. The Effective Teaching Behaviors Questionnaire was reviewed critically by several Old Dominion University dental hygiene faculty who's comments were used for revision. Once revisions were made, a pilot study was conducted on a sample of Old Dominion University dental hygiene students to determine the reliability and validity of the instrument.

The sample consisted of the entire student population of five accredited dental hygiene programs: three baccalaureate degree university programs and two associate …

The Effects Of Varying Fresh Water Discharge On Dispersion In An Estuarine Hydraulic Model Of The Lafayette River, Norfolk, Virginia, Michael J. Jugan

OES Theses and Dissertations

Three experimental tests were conducted in the Lafayette River branch of the Chesapeake Bay Hydraulic Model, each successive test with an increase in the amount of fresh water discharged into the head of the river. This was done to study the response from varying river discharge on mixing parameters including the longitudinal dispersion coefficient (E).

The model generated a tide of constant range and period. Batch releases of Rhodamine WT dye were made in the model and sampled throughout the river for ten tidal cycles. Samples were taken simultaneously at selected high and low water slack.

The calculation of the …

The Effects Of Dredged Material (Suspended Solid Phase) On The Hatching Success Of Spot Eggs (Leiostomus Xanturus), Meryl A. Masters

OES Theses and Dissertations

A 24-hour static bioassay was performed with the suspended solid phase of bottom sediment from a highly industrialized river utilizing eggs of the spot, Leiostomus xanthurus. Hatching success was measured at four concentrations of elutriates prepared from sediment obtained from the confluence of the eastern and southern branches of the Elizabeth River adjacent to the Norfolk Shipbuilding and Drydock in Norfolk, Virginia. Test results indicated no significant effect on hatching success at any of the four test concentrations.

Modeling Charge Diffusion From Proton-Induced Ionization Tracks In Silicon Photodiode Arrays, Lee Cole Smith

Physics Theses & Dissertations

We are modeling the combined problem of generation and collection of charge carriers created during passage of energetic protons through a silicon photodiode array. We have also experimentally obtained pulse-height distributions of noise charge collected during exposure of a Digicon-type diode array to 21 and 75 MeV protons. It is shown that the magnitude of charge collected by a diode from each proton event is determined not only by diffusion, but by statistical considerations involving the ionization process itself. Utilizing analytical solutions to the diffusion equation for transport of minority carriers, together with the Vavilov-Landau theory of energy-loss fluctuations in …

Comparison Of Steady-State Pipe Network Computer Programs, Michael Bernice Holloway

Civil & Environmental Engineering Theses & Dissertations

Four widely used computer programs for the analysis of steady state flows in pipe networks are compared. These programs are NEWTH, written by Jeppson; KENTUCKY, written by Wood; FLOW, written by Epp and Fowler; and LIQSS, written by Stoner. Differences, similarities, advantages and disadvantages of these programs, and various options available are discussed for the benefit of possible future users. In addition, the efficiency of NEWTH, KENTUCKY, and FLOW was tested by simulating a typical network by each program. The listing of LIQSS was not available, and thus was not included in this comparison. In simulation, KENTUCKY used over twice …

The Effect Of Syntactic Structure And Semantics Of The Comprehension Of Content Area Prose By Mainstreamed Learning Disabled Adolescents, Kathleen Charlotte Shelton

Communication Disorders & Special Education Theses & Dissertations

The purpose of this study was to determine the influence of syntactic structure and/or semantics on the comprehensibility of content area prose. The population consisted of learning disabled junior high school students who were mainstreamed into a minimum of four out of six regular classes. Drawn from subjects obtaining parental permission, 92 students were selected utilizing a table of random numbers to constitute the sample. The subjects were randomly assigned to one of three treatment groups or a control group and were administered a history textbook passage that contained syntactic and/or semantic changes or one that contained no changes. The …

Stratigraphy And Depositional Environments Of A Late Pleistocene Barrier Island Complex, Southeastern Virginia, Alan K. Jasper

OES Theses and Dissertations

The Norfolk, Kempsville, and Sand Bridge Formations beneath the HIckory Scarp of southeastern Virginia are reinterpreted as representing one glacio-eustatic transgressive cycle. The timing of this transgressive event is set during the earliest Wisconsinan. The formations were previously interpreted as unconformable overlying one another. The Norfolk-Kempsville unconformity is actually a diagenetic boundary. Evidence is presented which indicates that the Kempsville Scarp area should be reduced to member status or dropped entirely.

The Effects Of Kepone On The Estuarine Copepod Acartia Tonsa, Judith Marie Wilson

Biological Sciences Theses & Dissertations

Due to the contamination of a 113 km reach of the James River, Kepone poses a serious environmental threat to the Chesapeake Bay. The purpose of the study is to determine the acutely toxic and sublethal levels of kepone for the copepod Acartia tonsa, and to investigate what effects those levels may have on filtration rates.

Kepone was determined to be acutely toxic to A. tonsa, with a 96 hour LC50 of 4.96 ug/1. Dunaliella tertiolecta was selected as the food source for the grazing experiments. Kepone concentrations of 0.046 ug/1 significantly (0.05 level) reduced the flltering rate …

Analysis Of Organic N-Chloramines In Chlorinated Drinking Water, John Po Wen Yang

Chemistry & Biochemistry Theses & Dissertations

This thesis describes the development of a sensitive method for the separation and quantitation of organic N-chloramines in chlorinated tap water. 5-Dimethylaminonaphthalene- l-sulfinic acid has been synthesized and characterized. It yields highly fluorescent dansyl derivatives on reaction with N-chloramines. Conditions of the derivatization were optimized for the detection of N-chloropiperidine at concentrations in aqueous solution of 10^-7 M. The technique gives a quantity of derivative which is proportional to the concentration of chloramine present over the range examined (10^-7 M to 10^-4 M). High pressure liquid chromatographic separation of dansyl derivatives of amines and amino acids has …

Interaction Of A Two-Dimensional Transverse Jet With A Supersonic Mainstream, Gilbert Otto Kraemer

Mechanical & Aerospace Engineering Theses & Dissertations

A experimental investigation of the interaction of a twodimensional sonic jet injected transversely into a confined main flow has been conducted. The main flow consisted of air at a Mach number of 2.9. The effects of varying the jet parameters on the flow field were examined using surface pressure and composition data. Also, the downstream flow field was examined using static pressure, pitot pressure, and composition profile data. The jet parameters varied were gapwidth, jet static pressure, and injectant species of either helium or nitrogen. The values of the jet parameters used were 0.039, 0.056,and 0.109 cm for the gapwidth …

An Approach For Including Reliability In Control System Designs, Ime Isaac Akpan

Mechanical & Aerospace Engineering Theses & Dissertations

An approach is developed for non-catastrophic control component failure accommodation for large space structures. Reliability is considered for both the control configuration (i.e., selecting actuator locations over an admissible set) and the ultimate operation of the system. The approach presented is to construct a measure of performance that indicates the absolute goal of the system, and for a given structural design, to determine the lowest achievable cost conditional upon the failure states of the system (i.e., which actuators are operational). These costs are then weighted and summed to provide an overall system performance measure. This expected performance measure is then …

The Historical Development Of The Radical Anabaptist Movement, 1525-1535, Ronald Edward Sawyer

History Theses & Dissertations

The Anabaptist movement has been judged unfairly as a radical religious sect that brought destruction and chaos to sixteenth century continental European society. this judgment is based upon the events which occurred at Munster, 1534-35, when a group of Radical Anabaptists under the leadership of Jan Matthys and Jan Brockelson forcibly ruled the city.

This thesis shows that the actions and beliefs of the Radical Anabaptists at Munster represent only a small fraction of the Anabaptist movement. Much of this misunderstanding is due to the problem of defining and categorizing the Anabaptists. This study resolves the problem by tracing the …

The Evening Parade A History Of The Marine Corps' Most Famous Ceremony, John H. Admire

History Theses & Dissertations

Abstract unavailable.

An Investigation To Model Radar Backscatter From Ridged First Year Sea Ice, Betty Lou W. Jackson

Electrical & Computer Engineering Theses & Dissertations

This thesis investigates the response of a radar type sensor, the microwave scatterometer, to meter scale roughness of first-year sea ice. The scatterometer measures the absolute backscattered power from a target, and use of the radar equation permits calculation of the surface reflectivity expressed as the radar scattering coefficient, σ⁰ also called the normalized radar cross section. This thesis develops an empirical, one dimensional model to predict the backscattered power from ridged first-year sea ice of known surface topography, by interpreting the surface as a series of angular facets and summing the proportional power from each facet. The model …

The Effects Of Modeling And Direct Instruction On Learning Disabled Children's Atypical Numerical Cognition, Mary Crossland Phelps

Communication Disorders & Special Education Theses & Dissertations

Despite the widespread nature of mathematical learning disabilities, research within this area has been minimal. This study investigated the basis of atypical numerical concept development. Seriation, one of the most important components of concrete logical reasoning, was studied to determine the existence of a developmental delay or horizontal decalage in the Piagetian stage transition from preoperational to concrete operational thought. The influence of modeling and modeling plus direct instruction on the induction of seriation behavior was examined, using 60 learning disabled children and 40 remedial math students in a 4 x 2 analysis of covariance. Students were selected on the …

A Comparison Of Emotionally Disturbed Adolescents' Math Achievement On The Wrat Piat And Key Math, Bridget Dalton Gorman

Communication Disorders & Special Education Theses & Dissertations

This study investigated performance on the Key Math, WRAT Arithmetic and FIAT Math subtests. One hundred thirty emotionally disturbed adolescents undergoing inpatient treatment at a psychiatric hospital were administered the FIAT and WRAT. Sixty low math achievers were also administered the Key Math. Sixty-five subjects each were assigned to the Average Achievement and Below Average Achievement groups based on FIAT total test scores, FIAT math and WRAT arithmetic grade equivalent scores (GE) and standard scores (SS) correlated significantly for all groups. Key Math GE scores correlated significantly with FIAT math and WRAT arithmetic GE scores. Analyses of variance were computed …

The Wechsler Intelligence Scale For Children-Revised And The Woodcock-Johnson Tests Of Cognitive Ability: Performance Comparisons Of Elementary Students Being Referred For Special Education Services, Priscilla Mazza Hardiman

STEMPS Theses & Dissertations

The purpose of this study was to compare the performance of students being referred for special education services on the Woodcock-Johnson Tests of Cognitive Ability (WJTCA), Part One from the Woodcock-Johnson Psycho­ Educational Battery and the Wechsler Intelligence Scale for Children-Revised (WISC-R). A sample of 54 elementary students in grades one through six was randomly selected from a referral population for special education identification and services. The subjects were administered all subtests in the Woodcock-Johnson Tests of Cognitive Ability and the Wechsler Intelligence Scale for Children­ Revised within a three month period of time. The results indicated a significant relationship …

Feeding Behavior Of Three Species Of Spionid Polychaetes, Thomas Lane Stokes Jr.

Biological Sciences Theses & Dissertations

Observations of feeding behavior of three species of spionid polychaetes (Paraprionospio pinnata, Polydora ligni, and Streblospio benedicti) were performed in currents ranging from 0 to 10 cm/sec over fine and coarse sediments and in high and low suspended particle loads. These interface feeders may suspension feed, deposit feed, or both simultaneously using a pair of anterior tentaculate feeding palps. P. ligni and S. benedicti were found to alter their palp behaviors in response to experimental manipulations. P. ligni reacted strongly to currents by suspension feeding with coiled palps. S. benedicti reacted strongly and complexly to food particle type and availability. …

An Analysis Of The Relationships Between Environmental Stimuli Personality Variables And Levels Of Burnout In Intensive Care Nurses, Catherine Via Cauthorne

Psychology Theses & Dissertations

The syndrome of burnout is characterized by the development of negative self-perceptions and behaviors designed to protect oneself from emotional distress in a worker as a result of painful emotional stress generated by interactions between psychological demands from the work environment, personality needs of the worker, and the worker's self-perceived difficulty in meeting these demands and needs. The contributions of both environmental characteristics and personality traits to burnout levels were examined in a group of 45 intensive care nurses. Tests used included the Sixteen Personality Factor Questionnaire, a data questionnaire, the Survey of Organizations, and the Maslach Burnout …

Development Of An On-Line Computer System For Enzyme Kinetics Studies, Jacqueline R. Thweatt

Chemistry & Biochemistry Theses & Dissertations

The PDP-11/10 minicomputer was interfaced to the Beckman 25 ultraviolet/visible spectrophotometer and this on-line computer system was applied to enzyme kinetics studies. This interface involved hardware equipment to locate, amplify, and transmit the analog signal to an analog-to-digital converter, and software to acquire and store the digital data. Data processing programs were used to calculate kinetic parameters and statistical information from the acquired data.

The Varian Cary 219 ultraviolet/visible spectrophotometer can be readily interfaced to the Apple II Plus microcomputer by hardware equipment which can be purchased from the manufacturer. Various software may also be purchased for use in enzyme …

An Ecological Study Of The Troglobitic Cirolanid Isopod Antrolana Lira Bowman From Madisons Saltpetre Cave And Stegers Fissure, Augusta Co., Virginia, T. Lynn Collins

Biological Sciences Theses & Dissertations

An ecological study of the troglobitic cirolanid isopod, Antrolana lira Bowman, was begun in August 1979 and continued through September 1980. The isopod is restricted to two phreatic lakes in Madisons Saltpetre Cave and one phreatic lake in nearby Stegers Fissure, Augusta Co., Virginia.

All three phreatic lakes were scuba dived and surveyed. No direct connections were found between the lakes. However, physical similarities suggest that the lakes are made up of the same body of phreatic water.

Random samples were taken monthly and seasonally from the east lake in Madisons Saltpetre Cave and the lake in Stegers Fissure. Specimens …

Absorption Coefficients Of Ozone At Low Temperature In The Visible Region, Hessameddin Ghiassi

Physics Theses & Dissertations

The temperature dependence of absorption coefficients of ozone was studied between 7567 Å and 4630 Å . When the gas was cooled from room temperature to -108° C, an overall increase in the absorption coefficients was noticed. The maximum increase of 5% occurred at λ = 6020 Å. In general, the absorption is linearly dependent on temperature.

The Influence Of Lamaze Classes And Delivery Room Presence On Paternal Attachment Behavior, Cherie Sammis-Gonzales

Ellmer School of Nursing Theses & Dissertations

The purpose of this research was to determine the significance of attendance of Lamaze classes and(or presence in the delivery room on paternal attachment behaviors. Seventeen white, first-time fathers, ages 20 to 35, were observed in the mother's hospital room within 72 hours of birth using a modified paternal attachment tool. The behaviors observed included verbalization, inspection, holding, en face, smiling, and tactile response. Observations were scored on 30-second intervals for a total of 15 minutes. Fathers were then placed into one of the following groups: Group I (n 10) — Fathers from Lamaze classes and present in the delivery …

Client Acceptance Of The Role Of The Nurse Practitioner, Mary Elizabeth Butt

Ellmer School of Nursing Theses & Dissertations

Former studies aimed at answering questions regarding the acceptance of the nurse practitioner role usually have compared that role to that of the primary care physician. This study seeks answers to the question of acceptance of the role of the nurse practitioner as it stands on its own, encompassing the concepts of both care and cure. Using a five-point Likert scale, 90 adult recipients of nurse practitioners' care for acute episodic and chronic illnesses in clinic settings, were surveyed as to their perceptions of that care. The data were statistically analyzed and were found to show a high level of …

The Effects Of Exercise On Women's Self-Esteem, Wendy Laurie Biddle

Ellmer School of Nursing Theses & Dissertations

The effects of a 12-week session of aerobic dancing were examined on two groups of women, assigned into fit and unfit groups. The subjects had voluntarily enrolled in aerobic dancing prior to the study. Self-Esteem scores were obtained using the Rosenberg Self-Esteem Scale during the first and tenth or eleventh weeks of the session. Pretest and posttest scores were analyzed along with the variables of age, marital status, weight loss, and smoking habits. A significantly higher gain score (posttest score subtracted from pretest score) was found on those women who attended three weekly classes compared to those who attended two …

A Comparative Analysis Of Factors Influencing Registered Nurse Retention And Turnover Below The Head Nurse Level In Acute Care Hospitals, Jean M. Snyder

Ellmer School of Nursing Theses & Dissertations

In a comparative survey, two groups of registered nurses (stayers and leavers) below the head nurse level were measured in the areas of human need satisfaction perception, role perception, and equity perception. The two registered nurse groups were further subdivided by educational preparation into diploma, associate, and baccalaureate degree stayers and leavers for comparative analysis. Literature reviews revealed considerable research in the area of retention and turnover, but few studies used a theoretical framework and a multivariate basis for observation. One hundred nine registered nurses from the ten area acute care hospitals were surveyed using an independently developed Nursing Perceptions …

An Analysis Of A Sample Of Parents And University Freshmen In Regard To Their Attitudes Toward The Needs Of Sex Education In Community Schools, Linda C. Aleksa

Community & Environmental Health Theses & Dissertations

This study attempted to investigate a sample of both parents' and college freshmens' attitudes toward sex education, and the content and timing of sex education in the Tidewater schools. Two Likert-type scales each containing ten statements were administered in order to survey attitudes. A statistically significant difference was found in scores on the attitude toward content and timing of sex education scale between parents and college freshmen. Parents demonstrated a more favorable attitude toward sex education as an integral component of the overall educational curriculum. The majority of parents indicated support for including important aspects such as reproduction and indicated …

The Contributions Of Robert Grosseteste And Roger Bacon To The Development Of The Scientific Method At Oxford, Isabel Charles Duncan Hatchett

Institute for the Humanities Theses

Robert Grosseteste and Roger Bacon were instrumental in bringing about the use of experimental science and inductive reasoning at Oxford University, and in making science and mathematics a central part of intellectual thought. Grosseteste introduced the experimental method and Bacon assured its survival, amplifying Grosseteste's ideas and passing them on, His role was as important to science and mathematics as was Grosseteste's innovation.

The scientific thoughts of these men differed radically from the accepted medieval approach. They used mathematics and experimentation in their studies and worked with theories of science and education in developing their ideas. They examined science in …