Digital Commons Network^™

Simulator For Concurrent Processing Data Flow Architectures, Mahyar R. Malekpour

Electrical & Computer Engineering Theses & Dissertations

A software simulator capable of simulating execution of an algorithm graph on a given system under the Algorithm To Architecture Mapping Model (ATAMM) rules is presented in this thesis. ATAMM is capable of modeling the execution of large-grained algorithms on distributed data flow architectures. Investigating the behavior and determining the performance of an ATAMM based system requires the aid of software tools. The ATAMM Simulator presented in this thesis is capable of determining the behavior, performance, and reliability of a system without having to build a hardware prototype. Case studies are performed on four algorithms to demonstrate the capabilities of …

Signal Intelligence And Macarthur's Use Of Military Intelligence (G-2) During The Second World War, James Walter Zobel

History Theses & Dissertations

Though signal intelligence significantly benefited MacArthur 's conduct of military operations during the Second World War, each of his campaigns from July 1942 to August 1945 was marred by his reliance on inaccurate intelligence provided by his G-2 organization. An examination of the production and use of intelligence during MacArthur's campaigns displays these mixed aspects of his use of intelligence. Historical analysis shows MacArthur made effective use of signal intelligence, and despite instances of his reliance on inaccurate estimates the result was never disastrous. A detailed view of MacArthur's use of intelligence can be found in the records of his …

Characteristics Of Families And Home Environments That Facilitate The Successful Adaptation Of Children Into A Formal School Environment, Janice Elich Monroe

Theses and Dissertations in Urban Services - Urban Education

The purpose of this study was to determine what characteristics of families are most likely to enhance the development of social capital in young urban school children and to determine which of these characteristics or combination of characteristics contribute to a child's ability to adapt positively to a formal school environment. This purpose was accomplished through the design and implementation of an ex post facto study utilizing qualitative and quantitative research methodologies. The sample for this study included 33 second grade students from four target schools in the Norfolk Public School System who were identified as disadvantaged and as either …

School Desegregation And Urban Renewal In Norfolk, 1950-1959, Forrest R. (Hap) White

Theses and Dissertations in Urban Services - Urban Education

Although a number of scholars have examined the impact that the U.S. Supreme Court's Brown v. Board of Education decision had upon local school policies, there is a paucity of research on what repercussions that decision may have had upon a broad range of other related municipal issues. This historical case study explores the effect that opposition to court ordered school integration had upon the placement of school buildings and urban renewal projects in one Southern city, Norfolk, Virginia, where there was strong reason to believe that the municipal powers of school plant planning, redevelopment, and city planning were deliberately …

Maximum Likelihood Estimation For Distributed Parameter Models Of Large Beam-Like Structures, Ji Yao Shen

Mechanical & Aerospace Engineering Theses & Dissertations

Proposed large space structures have many characteristics that give an advantage to modeling their structural dynamics by a set of partial differential equations (PDE's). By far, the most effort put forth in studying system identification and control to date has been based on finite element models. Despite its acceptability, such lumped parameter models have inevitable deficiencies primarily because of their complexity. Both approaches are complementary and each should be used where it is most effective. But the fact is that the distributed parameter approach has not been developed to the level of maturity as for the lumped parameter approach.

Motivated …

Kinematic Synthesis Of Deployable-Foldable Truss Structures Using Graph Theory, Dirk B. Warnaar

Mechanical & Aerospace Engineering Theses & Dissertations

A graph theoretic approach is applied to the conceptual design of deployable truss structures. The characteristics that relate to the inter-connectivity of the elements of a deployable truss structure can be captured in a schematic representation, called a graph. A procedure is presented that enables the exhaustive generation of these graphs for structures of any given number of nodes and links and which are foldable onto a plane or onto a line.

A special type of truss structures, called truss modules, is presented. Graphs of this class of structures form a subset of the graphs of truss structures. Two procedures …

Submerged Aquatic Vegetation Trends Of Back Bay, Virginia, Donald Schwab, Fairfax H. Settle, Otto Halstead, Richard L. Ewell

III. Flora

(First Paragraph): Submerged aquatic vegetation (SAV) is an important part of a healthy Back Bay ecosystem. SAV helps to stabilize sediments that enter the system and to deter shoreline erosion. The submerged macrophytes serve as filters, improving the quality of the water column by removing many pollutants and dissolved nutrients (Clark, et al., 1973; and Stevenson, et al., 1979). These aquatic plants provide important habitats for a variety of wildlife species, which use the grass beds for shelter, feeding and breeding areas. SAV is a major primary producer in the food chain associated within the aquatic and adjoining upland habitats. …

Rx For Success At Back Bay National Wildlife Refuge: Take Two Committed Partners-Add Water, Janet Taylor, Julia Herrick, Ben Mathias

V. Poster Abstracts

As part of a major effort to improve habitats for waterfowl and other wetland-dependent wildlife, Ducks Unlimited, Inc. is contributing $187,500 in matching funds to help the U.S. Fish and Wildlife Service rehabilitate wetland impoundments at Back Bay NWR.

The three-year project will increase Refuge management capabilities on existing wetland areas, create 300 acres of new marsh habitat and increase water management flexibility throughout the impoundment system. Components of the project include:

• Raising and re-sloping 8 miles of existing dikes
• Installing 13 new water control structures
• Constructing 6,000 feet of new dikes
• Creating two storage pools totalling 53 acres and …

Rates Of Sediment Accumulation, Bioturbation And Resuspension In Back Bay, Virginia, A Coastal Lagoon, Donald J.P. Swift, George T.F. Wong

I. Water Quality

Back Bay is the northernmost section of the Albemarle-Pamlico lagoon-estuary system. Back Bay lagoon and its associated barrier (Currituck Spit) are moving landward in response to post-glacial sea level rise (2.6 mm yr^-1). The long term (100 year time scale) landward migration rate of Currituck Spit may be on the order of a meter per year.

Sediment accumulation, resuspension and bioturbation are processes in Back Bay that control the residence time of organic matter in the bay floor. and therefore, effect the rate of nutrient release. As burial proceeds, nutrients in the zone of mixing may be remineralized …

Environmental Education: A Chance For The Future, Ben Mathias

V. Poster Abstracts

The U.S. Fish and Wildlife Service is committed to providing environmental education opportunities for the Nation's student body. Local, regional and national educators are invited to investigate and utilize the resources of Back Bay National Wildlife Refuge with their colleagues and students. Teacher workshops at the Refuge provide orientation to Refuge lands, outdoor classroom sites, trails, interpretive facilities and equipment, and potential field activities. Refuge staff members are available to assist with: • Preliminary planning • Group scheduling • Library research • Workshop registration • Trip logistics and • On-site group orientation. Most classroom sites, associated trails/boardwalks, and Visitor Contact …

Refuge Management: Committed To The Future, Anthony D. Leger

IV. Management

The Back Bay National Wildlife Refuge was established on June 6, 1938, " ... as a refuge and breeding ground for migratory birds and other wildlife." During its first 30 years, the Refuge was managed similar to other areas of the National Wildlife Refuge System. Dikes were constructed, facilities were built, and wildlife management programs were initiated. In the late 1960's, the emphasis of the area changed, as increasing numbers of beach oriented visitors, primarily using 4 wheel drive vehicles, began using the area. By 1971 public use reached 348,000 visits per year. Throughout the 1970's and early 1980's Refuge …

Assessment Of Organic And Metal Contaminants In Lower Back Bay And Upper Currituck Sound, Kate Benkert

V. Poster Abstracts

Studies were conducted at Mackay Island National Wildlife Refuge in 1988 and 1989 to provide baseline data for an assessment of organic chemicals and metal contaminants in the aquatic ecosystem. Longnose gar, gizzard shad, snapping turtles, common rangia clams and sediments were collected from sites in lower Back Bay and upper Currituck Sound for contaminant analyses.

Composite sediment samples were analyzed for the presence of metals, organochlorine pesticides and polycyclic aromatic hydrocarbons (PAHs). Organochlorine pesticides were not detected in the sediments. Various PAH compounds were detected in the sediments, although at trace concentrations which just exceeded the analytical detection limit …

Refuge Land Acquisition: Helping Preserve Back Bay's Wildlife Heritage, Julia Herrick, Ben Mathias, Janet Taylor

V. Poster Abstracts

The once-renowned waterfowl populations and bass fishery of Back Bay, Virginia have declined dramatically in recent years. Lands surrounding Back Bay are increasingly threatened by on-going and potential land development. These lands serve as an important filter for pollutant and sediment-laden runoff from adjacent areas. The boundary of the Back Bay National Wildlife Refuge was expanded in 1989 to include an additional 6,340 acres of brackish marsh, forested swamp, and "critical edge" upland habitat, important to a variety of wildlife species and for its natural filtering effect. Within the U.S. Fish and Wildlife Service's policy of working with willing sellers, …

The Marshes Of Back Bay, Virginia, Walter I. Priest, Sharon Dewing

III. Flora

An inventory was undertaken to determine the type and extent of the emergent tidal wetlands in Back Bay, which, historically, has ranged from a lunar tidal brackish estuary to a wind tidal freshwater system. The inventory was conducted primarily by boat with visual observations made for each marsh. The configuration and areal extent of each marsh was determined from USGS topographic maps and confirmed with aerial photography where necessary. Approximately 9925 acres of wetlands as defined by the Commonwealth of Virginia were identified within the watershed. These wetlands supported a very diverse flora consisting of over 109 species.

The five …

Community Structure Of The Macrobenthos In Back Bay, Virginia, Michael F. Lane, Daniel M. Dauer

II. Fauna

A study of the subtidal macrobenthos in Back Bay, Virginia was conducted to examine community structure in relation to sedimentary and water quality characteristics. Samples were collected in August and November of 1987 and February and May of 1988 at ten stations.

From a cluster analysis of ten collection stations, three site groups were identified. Species composition between site groups was relatively homogeneous. Discriminant analysis indicated that eight species accounted for most of the variation between site groups. A comparison of plots of the biological and environmental variables in discriminant space suggested that variation in the biological data between site …

Electric Field Induced Emission As A Diagnostic Tool For Measurement Of Local Electric Field Strengths, A. N. Dharamsi, K. H. Schoenbach

Bioelectrics Publications

The phenomenon of electric field induced (EFI) emission is examined in several diatomic and polyatomic molecules. The possibility of using this phenomenon as a diagnostic tool to measure, nonintrusively, the strength and direction of local electric fields in plasmas is discussed. An estimate of the EFI signal emitted in a typical application plasma is given. This yields a lower bound on the detector sensitivity necessary to exploit EFI emission in practical applications. It is concluded that, at present, the EFI signal could be measured by some very sensitive infrared detection schemes available. Current progress in infrared detector technology, if maintained, …

A Study To Determine The Effectiveness Of Present Methods Of Extinguishing Disruptive Classroom Behavior At An Alternative High School, Jon J. Cookson

OTS Master's Level Projects & Papers

The goals of this research were threefold: 1. What were the two most prevalent disruptive classroom behaviors; 2. What current methods were used to discourage the two most prevalent disruptive classroom behaviors; 3. What current methods to prevent disruptive classroom behavior from occurring were most effective.

The Implementation Of "Lab 2000" And "Synergistic Systems" In Middle School Laboratories In Virginia, Patricia M. Ways

OTS Master's Level Projects & Papers

To solve this problem, the following goals were developed: 1. Determine the effectiveness of the "high tech" laboratories with regard to implementing the middle school curriculum; 2. Make recommendations for facility and curriculum changes based upon the observations of the practicing middle school teachers.

Self-Activation And Inhibition: A Simple Nonlinear Model, J. A. Adam

Mathematics & Statistics Faculty Publications

Self-activation and self-inhibition of cell number density (or growth factor concentration) due to a spatially localized source are studied. Both the time-independent and time-dependent models are examined, and the linear stability of the resulting three steady states of the former is discussed.

Activator-Inhibitor Control Of Tissue Growth, John A. Adam

Mathematics & Statistics Faculty Publications

This note develops a simple model for the competition between activator and inhibitor control mechanisms in one-dimensional tissue growth. The pedagogic usefulness of such a model is that it is easily accessible to undergraduate applied mathematicians and is suggestive of behavior known to occur in more realistic biological systems (e.g., some types of cancer). The limitations of the model are obvious and can provide a basis for discussion of the applicability of complementary levels of description in mathematical modeling.

Virginia Woolf's Keen Sensitivity To War: It's Roots And It's Impact On Her Novels, Nancy Topping Bazin, Jane Hamovit Lauter

English Faculty Publications

(First paragraph) War InspIred Horror In Virginia Woolf. Her antipathy toward those who cause wars is evident in her two essays, A Room of One's Own and Three Guineas. The impact of war on her fiction expands from a portrayal of individuals as victims of war to a vision of war that encompasses the possible annihilation of civilization. Between the Acts, Woolf's final novel, is obviously an artistic response to the threat posed by World War II. However, a close examination of her works reveals, to a surprising degree, her early and persistent preoccupation with the consequences of war, …

Observations Of A Cyclonic Ring: Gulf Stream Coalescence Event Over The Blake Plateau, Julie Mcclean-Padman, Larry P. Atkinson

CCPO Publications

Hydrographic data collected in September 1980 over the Blake Plateau were analyzed using a combination of empirical search and inverse techniques. Five sections, extending from the continental shelf break eastward across the Blake Plateau, were positioned at approximately 1-degrees intervals between 28-degrees and 32-degrees-N. The empirical search procedure was applied to four closed regions (boxes), constructed from adjacent sections, where each region was assumed to consist of two conservative layers. Five geostrophic velocity sections were obtained using the average optimum reference level for the four boxes. The inverse technique provided barotropic correction velocities that caused all layers to conserve mass. …

Marge Piercy's Small Changes: Welcome To The Sexual Revolution, Nancy Topping Bazin

English Faculty Publications

Marge Piercy's novel Small Changes is encyclopedic in its incredibly detailed, all-encompassing feminist analysis of female and male behavior in the late 60's and early 70's. The behavior of the younger generation is compared and contrasted with that of their parents. The overall impression given by the novel is that, despite the very different life-styles of the two generations, very little change has, in fact, occurred. At the end of the novel, sexism prevails and no significant threat to male control of the power structure has developed. From examination of the title, Piercy seems to place her emphasis not upon …

Women And Revolution In Dystopian Fiction: Nadine Gordimer's July's People And Margaret Atwood's The Handmaid's Tale, Nancy Topping Bazin

English Faculty Publications

Nadine Gordimer's July's People (1981) and Margaret Atwood's The Handmaid's Tale (1985) are both dystopias, nightmare visions of the future. Both of the worlds depicted come into being because of revolutionary coups. However, in both cases, the revolutions were in progress long before the actual takeovers, and there were opportunities for citizens to have prevented these dystopian situations from coming to pass. Yet, because changing the direction of political events requires energy, solidarity, bravery or at least some self-sacrifice, most citizens are reluctant to become involved. Nadine Gordimer and Margaret Atwood understand this attitude because they have felt that way …

Overall Laughing One And The Experiences, Anina Porter Adams

Institute for the Humanities Theses

A fictional play based on the study of writings by psychotherapist Carl Gustav Jung. The action is set in the imaginary realm of archetypes, amoral personified energies which appear in tales from diverse cultures. In this play the mythical characters move in an ordered, ritualistic manner. They are dependent upon a geometrically centered black box for the provision of human forms through which they experience "being." A female is the human form provided in this instance and she combines her own energy with that of the other characters though she is not conscious of this fact. The archetypal energies focus …

Integration Of Abductive And Deductive Inference Diagnosis Model And Its Application In Intelligent Tutoring System, Jingying Zhang

Computer Science Theses & Dissertations

This dissertation presents a diagnosis model, Integration of Abductive and Deductive Inference diagnosis model (IADI), in the light of the cognitive processes of human diagnosticians. In contrast with other diagnosis models, that are based on enumerating, tracking and classifying approaches, the IADI diagnosis model relies on different inferences to solve the diagnosis problems. Studies on a human diagnosticians' process show that a diagnosis process actually is a hypothesizing process followed by a verification process. The IADI diagnosis model integrates abduction and deduction to simulate these processes. The abductive inference captures the plausible features of this hypothesizing process while the deductive …

Playdance, Gary Ryan Brown

Institute for the Humanities Theses

Playdance is a play in three acts which studies the relationships between parents and their children. The development of the script and the intended production was spurred by the pain that so many families experience as children grow away from their parents control. This look at the Denton household was an attempt to help understand the suffering and the feeling of solitude that so often accompanies this familial trauma. It was my intention to write a script that would be an exciting and insightful evening of theatre, but one that would remain accessible to a single and perhaps novice reader. …

Development And Evaluation Of Tracer Particles For Use In Microzooplankton Herbivory Studies, Mary Putt

OES Faculty Publications

Two methods of preparing algae for use as tracer particles in single species measurements of microzooplankton herbivory were evaluated. Algae were either heat-killed and labelled with 5-(4,6-dichlorotriazin-2-yl amino fluorescein) (DTAF) (Rublee & Gallegos 1989; Mar, Ecol. Prog. Ser. 51: 221-227) or stained with hydroethidine (HYD). Both DTAF and HYD-stained algae were readily visible within the digestive vacuoles of most microzooplankton collected in estuarine and coastal waters of Massachusetts (USA) and preserved with Lugol's iodine. However, DTAF was ineffective at staining several chromophytic algae and the heat-kill process reduced cell volume by ≥ 50% in several of the algae which were …

Trace Elements In Estuarine And Coastal Waters: U.S. Studies From 1986-1990, Gregory A. Cutter

OES Faculty Publications

The use of specialized analytical techniques, field studies, controlled laboratory experiments, and geochemical modeling have allowed U.S. investigators to expand our understanding of trace element cycling in coastal waters and estuaries. Considerable emphasis has been placed on quantifying the flux of trace elements within and through the coastal zone. In addition, substantial progress has been made in identifying the chemical speciation of many trace elements, providing a linkage between the geochemical and biochemical behavior of these elements. Another significant advance has been the use of trace elements as tracers of geochemical processes and water masses in the coastal environment.

The Kinetics Of Organic Matter Mineralization In Anoxic Marine Sediments, David J. Burdige

OES Faculty Publications

The kinetics of sulfate reduction and inorganic nutrient production (ΣCO_2, ammonium, and phosphate) were examined in the sediments at five sites in the southern Chesapeake Bay, using long term (> 200 d) sediment decomposition experiments. Average first order rate constants for these processes (at 25^oC) decreased from 8.2 to 3.7 yr^-1 in the surface sediments (0-2 cm), to 2.1 to 0.2 yr^-1 at 12-14 cm. The C/N and C/P ratios of the organic matter undergoing decomposition also increased with depth at these sites. Taken together, these results indicate that the reactivity of the organic matter …