Digital Commons Network^™

A Non-Linear Vortex Panel Method For Wings With Edge Separation, Vijay Kalburgi

Mechanical & Aerospace Engineering Theses & Dissertations

A global nodal vortex panel method is developed to predict steady aerodynamic loads on rectangular lifting surfaces with side edge separation. The lifting surface and free shear layers are modeled by bound and free vortex sheets respectively, which are then discretized into triangular bound and free vortex panels respectively. On each triangular panel, a linear distribution of vorticity is defined in terms of the global components of vorticity at its nodes. The velocity field induced by any triangular vortex panel is obtained in closed form. The vortex core of the side edge vortex is modeled by a concentrated core of …

Frances E. Willard's Southern Tours For Temperance: 1881-1883, Charles Jeffrey Shelton

History Theses & Dissertations

Frances E. Willard (1839-98) was the president of the Woman's Christian Temperance Union from 1879 until her death and one of the foremost temperance advocates of her time. This study explores the impact of Willard's first three tours of the South on that region's temperance movement and southern women, as well as on inter-sectional reconciliation after Reconstruction. The study concludes that Willard's efforts to organize W.C.T.U. chapters in the South were largely successful. Willard and her southern collaborators contributed greatly to a resurgence of the southern temperance movement and the involvement of southern women in community activities, but temperance advocacy …

Vatican Ii And The Answer To The Jewish Question, Ronald Lee Harris

History Theses & Dissertations

The Jewish question as considered and answered by Vatican II involved two separate but closely related segments: does the Church of today condone anti -Semitism, and are the Jews as a people guilty of deicide?

The purpose of this study is to examine anti-Semitism as it developed within the Church and the extent to which it was actively supported by the Papacy up to and including the Hitler era, to investigate the silence of the Church during the World War II slaughter of European Jewry, and to determine why the inclusion of a Statement on the Jewish people was necessary …

The Remarkable John Bigelow, Jr.: An Examination Of Professionalism In The United States Army, 1877-91, Howard K. Hansen Jr.

History Theses & Dissertations

This thesis describes the military career of John Bigelow, Jr. , with emphasis on the professional development of United States Army officers. It questions the role Bigelow played in the formation of army professionalism, a sense of corporate responsibility to exercise military expertise correctly. A focus on Bigelow to delineate professionalism in the army provides a fresh perspective of a pivotal period in American military history in the aftermath of the Civil War and before the United States started to build a colonial empire. Bigelow articulated a comprehensive concept of total^ar as he perceived its development in the United States. …

An Evaluation Of A Taylor-Galerkin Algorithm For High Speed Inviscid Flows Using Quadrilateral And Triangular Elements, Kim S. Bey

Mechanical & Aerospace Engineering Theses & Dissertations

The Taylor-Galerkin finite element algorithm is used to obtain solutions to the two-dimensional compressible Euler equations. The mathematical formulation of the algorithm is presented for a typical scalar equation. The derivation results in element equations which are assembled over the entire solution domain to obtain the system of equations that are solved explicitly. The algorithm has the unique feature that the finite element matrices can be evaluated in closed form, avoiding expensive numerical integration. Aspects of vector programming strategies and mesh generation important to an effective analysis procedure are also described. Solutions to supersonic flow problems with exact solutions are …

Storm Surge Predictions At Sewell's Point With Local Wind, Pressure, And Previous Surge As Surge Predictors In Chesapeake Bay, Joy Elaine Moses

OES Theses and Dissertations

The statistical model used to predict storm surge. which is defined as the difference between observed water level and predicted astronomical tide. at Sewell's Point. Virginia. for the last ten years relies on forecast surface air pressures interpolated over a large portion of the Atlantic Ocean. A variation on this method is developed which adds previous station surge and local wind and pressure terms with time leads up to 18 hours to the Pore prediction for surge. and develops surge prediction equations for three substations eight to 65 miles (13 to 105 km) from Sewell's Point. The Sewell's Point surge …

Lineament Analysis In The Richmond Triassic Basin Area Virginia: A Kinematic Model, Richard D. Lutz

OES Theses and Dissertations

A lineament study from various sources (color-infrared U-2 photos, rectified drainage maps, and aeromagnetic maps) was conducted to develop a conceptual kinematic model for the Richmond Triassic basin area in Virginia. The lineaments were digitized and subjected to a computerized correlation package that compared the statistically significant peaks within 8 km² grid cells. Spatially filtered significant 10° contoured trends exhibited a high correlation with mapped structures, outcrop patterns, diabase dikes, and aeromagnetic alignments, suggesting that they represent the surface expressions of the boundaries of subsurface structural domains. Structurally important lineament zones include NE-trending lineaments which segment the basin, NNW-trending …

Job Analysis And Job Evaluation Method Choice: User Qualifications And Implications For Applications And Research, James S. Herndon

Psychology Theses & Dissertations

Research interest in the areas of job analysis and job evaluation has been increased recently as a result of attention being given to the comparable worth issue. The purpose of the present study was to assess the effects of job analysis and job evaluation method choice on the outcome of the salary determination process, and to investigate how user qualifications interact with methods.

Within the context of the JAMES Matrix, two job analysis methods (CIT and FJA) were systematically paired with two job evaluation methods (ranking and point). Three groups of participants, representing distinctly different levels of expertise (method experts, …

The Troubadour Poets: Their Influence On Their Times, Georgia M. Jarrell

Institute for the Humanities Theses

Troubadour poetry was a phenomenon which occurred in the South of France during the eleventh through the thirteenth centuries. The style was one of political and social invectives and panegyrics, as well as a sophisticated love poetry. The tradition flourished and then died with direct relations to the political and religious events of the era. Through this poetry, the modern reader can not only understand the feelings of the individual poets but also gain insights on the lifestyles of the period and the events which had a bearing on the history of the period. The troubadours were truly mirrors of …

Relationship Of Stream Drainage And Airphoto-Derived Lineaments To Basement Structures In The North Central Virginia Coastal Plain, William F. Mullen

OES Theses and Dissertations

A lineament study was conducted in the north central coastal plain of Virginia using five different data sources; color infrared photo images, rectified stream segments, bouguer gravity anomaly maps, aeromagnetic anomaly maps, and residual magnetic anomaly maps to determine the potential of aerial photographic analysis in the delineation of basement structural features beneath the sedimentary cover of the Virginia Coastal Plain.

Statistical analysis of 1602 airphoto lineaments and 2337 rectified stream segments produced 15 airphoto lineaments and 18 rectified stream segment lineaments in the north central Coastal Plain Province of Virginia. Azimuthal coincidence of these 33 lineaments determined that there …

Convective Heat Transfer From Circular Cylinders Located Within Perforated Cylindrical Shrouds, Kamran Daryabeigi

Mechanical & Aerospace Engineering Theses & Dissertations

The influence of perforated cylindrical shrouds on the convective heat transfer to circular cylinders in transverse flow has been studied experimentally. Geometries studied were similar to those used in industrial platinum resistance thermometers. The influence of Reynolds number, ventilation factor (ratio of the open area to the total surface area of shroud), radius ratio (ratio of shroud's inside radius to bare cylinder's radius), and shroud orientation with respect to flow were studied.

The experiments showed that perforated shrouds with ventilation factors in the range 0.1 to 0.4 and radius ratios in the range 1.1 to 2.1 could enhance the convective …

On The Existence Of Periodic And Eventually Periodic Solutions Of A Fluid Dynamic Forced Harmonic Oscillator, Charlie H. Cooke

Mathematics & Statistics Faculty Publications

For certain flow regimes, the nonlinear differential equation Y¨=F(Y)−G, Y≥0, G>0 and constant, models qualitatively the behaviour of a forced, fluid dynamic, harmonic oscillator which has been a popular department store attraction. The device consists of a ball oscillating suspended in the vertical jet from a household fan. From the postulated form of the model, we determine sets of attraction and exploit symmetry properties of the system to show that all solutions are either initially periodic, with the ball never striking the fan, or else eventually approach a periodic limit cycle, after a sufficient number of bounces away from …

Late Prehistoric And Protohistoric Large Mammal Zoogeography Of Virginia, Robert K. Rose

Biological Sciences Faculty Publications

Evidence derived from18late prehistoric (middle and late Woodland Period) archeological sites, from several early historical accounts, and from the current understanding of the distribution of Virginia mammals indicates that the large mammal fauna of the Commonwealth has not changed substantially within the past 4,000 yrs. Some species (e.g., bison, elk, timber wolf, and mountain lion) have been extirpated since the settlement of Virginia by Europeans; some previously extirpated species (e.g., porcupine, coyote, and beaver) have been naturally or artificially reintroduced during the historical period, and others (e.g., woodchuck and red fox) probably have expanded their distributions as a result of …

The Physics Of The Antarctic Circumpolar Current, Worth D. Nowlin, John M. Klinck

CCPO Publications

A region of transition of surface water characteristics from subantarctic to Antarctic and an associated eastward flowing Antarctic Circumpolar Current (ACC) have long been recognized to exist as a band around Antarctica. In this review we summarize the most important observational and theoretical findings of the past decade regarding the ACC, identify gaps in our knowledge, and recommend studies to address these. The nature of the meridional zonation of the ACC is only now being revealed. The ACC seems to exist as multiple narrow jets imbedded in, or associated with, density fronts (the Subantarctic and Polar fronts) which appear to …

Wind-Driven Upwelling In The Vicinity Of Cape Finisterre, Spain, Charles R. Mcclain, Shenn-Yu Chao, Larry P. Atkinson, Jack O. Blanton, Frederico De Castillejo

CCPO Publications

Observations and numerical simulations of upwelling along the Galician coast of Spain during April 1982 are presented. In situ measurements include shipboard determinations of hydrographic and biological parameters from a grid of stations covering the continental shelf from Cape Finisterre to Ria de Vigo, sea level data from Vigo and La Coruña, and wind stress estimates derived from the ship winds and from surface pressure charts. Sea surface temperature information and pigment concentration information have been obtained from a sequence of satellite images from the NOAA 7 advanced very high resolution radiometer and the Nimbus 7 coastal zone color scanner, …

A Study Of The Effectiveness Of Developmental Reading And Writing Courses At Old Dominion University, Jimi Thomas-Muskovac

Theses and Dissertations in Urban Services - Urban Education

This study sought to (1) identify the number and demographic characteristics of students served by the remedial programs, (2) determine academic achievement and persistence of these students, (3) assess the performance of developmental reading and writing students in regular college English and regular college history classes, (4) identify components and characteristics used in the developmental programs which are associated with the success rate of developmental students and (5) assess the effectiveness of developmental education programs based on the evaluation of the number of students completing degree programs. The academic years under consideration are 1980 through 1985.

The study employed two …

Investigation Of Nickle As A Matrix Modifier In The Atomic Absorption Analysis Of Tin, Charles William Saunders

Chemistry & Biochemistry Theses & Dissertations

Nickel has been widely used as a matrix modifier in the flameless atomic absorption analysis of arsenic and selenium. Its utility as a modifier for tin has been investigated using Polarized Zeeman effect Graphite Furnace Atomic Absorption Spectroscopy. Peak area, peak shape, and appearance times were compared in modified and nonmodified standards using the system computer's internal integration and a detector/readout system with 18 msec resolution.

The addition of nickel at 600 mg/L increased the tin absorbance signal five-fold. The improved signal to noise ratio resulted in a two-fold increase in the sensitivity and a lower limit of detection. The …

Attitudes Of Special Education Students Towards Vocational Education Classes At Western Branch High School, Chesapeake, Virginia, Cynthia R. B. Sessoms

OTS Master's Level Projects & Papers

The purpose of this study was to determine special education students' attitudes towards vocational education classes. The following questions have provided guidance to the investigator in designing this study: 1) Is the decision to enroll in vocational education classes primarily made by the student(s)? 2) Are there external influences that affect special education students decisions to enroll in vocational classes from: a. peer pressures b. parental advice c. school guidance counselor d. special education teacher; 3) Has the student planned to enroll in a vocational education course in the future?

Deep Flow Variability In Central Drake Passage, John M. Klinck, Eileen E. Hofmann

CCPO Publications

A rotary empirical orthogonal function analysis of the currents measured in central Drake Passage during DRAKE 79 shows that the deep (2500 m) flow has the same spatial and temporal structure as the flow at 500 m, suggesting that current variability in this region penetrates to the bottom. However, comparison of the time amplitude of the corresponding modes indicates that the variability of the 2500 m flow resulting from north to south shifts in the location of the Polar Front lags that at 500 m by one to three days. This implies that the Polar Front slopes to the east …

An Assessment Of Current Procedures And Practices For Placement Of Handicapped Students In Vocational Programs In Chesapeake, Virginia, Linda Denise Britt

OTS Master's Level Projects & Papers

The questions related to this study were: 1. What major pieces of legislation shaped and promoted new cooperation between special education and vocational education in serving the handicapped? 2. How can administrators, special educators, vocational educators, guidance counselors, and parents augment cooperation, support, and communication between each other? 3. What are some of the considerations that effect decisions for placement of handicapped students in a vocational program?

Nonadiabatic Theory Of Fine-Structure Branching Cross Sections For Na-He, Na-Ne, And Na-Ar Optical Collisions, Linda L. Vahala, P. S. Julienne, Mark D. Havey

Electrical & Computer Engineering Faculty Publications

The nonadiabatic close-coupled theory of atomic collisions in a radiation field is generalized to include electron spin and is used to consider the weak-field Na–rare-gas (RG) optical collision Na(²S_1/2)+RG+nhν μNa(²P_j)+RG+(n-1)hν. The effects of detuning and incident energy on the branching into the atomic Na 3p²P_3/2 and 3p²P_1/2 states are examined. The cross sections σ(j) are found to have a strong asymmetry between red and blue detuning as well as a complex threshold and resonance structure dependence on energy. A partial cross-section analysis …

Factors Regulating Settlement And Microhabitat Use By Spiny Lobsters Panulirus Argus, William F. Herrnkind, Mark J. Butler Iv

Biological Sciences Faculty Publications

Clumps of highly-branched red algae Laurencia spp. serve as important settling habitat for postlarval spiny lobsters Panulirus argus and as residence for early benthic-stage juveniles. Given choice between the 2 most abundant macrophytes in Florida Bay, Laurencia spp. and the seagrass Thalassia testudinum, postlarval and juvenile lobsters chose Laurencia spp. Postlarvae apparently use intricate algal architecture as a cue for settlement, whereas juveniles use both architecture and food abundance in selecting habitat. In tethering experiments, predation on juvenile lobsters was very high on open sand, much reduced in algal clumps and seagrass, and lowest in dense algal meadows. Predation …

Tidal Circulation In Chesapeake Bay, Carl W. Fisher

OES Theses and Dissertations

This study is a comprehensive examination of the tidal circulation of Chesapeake Bay and its major tributaries. Tide and current data, which were observed in Chesapeake Bay by the National Ocean Service during the period from 1972 to 1983, are analyzed and used to construct charts that describe the tide and tidal current. Frictionally damped analytic models are used to: explain the tidal hydrodynamics of the observed tides, determine the location of the quasinodes and antinodes of the M₂ and K₁ tidal waves, explain the relationship of the tides and tidal currents, and determine if the tide in …

Estimation In Truncated Exponential Family Of Distributions, Laxman M. Hegde

Mathematics & Statistics Theses & Dissertations

Estimating the parameters of a truncated distribution is a well known problem in statistical inference. The non-existence of the maximum likelihood estimator (m.l.e.) with positive probability in certain truncated distributions is not well known. To mention a few results in the literature:

(i) Deemer and Votaw 1955 show that the maximum likelihood estimator does not exist in a truncated negative exponential distribution on 0,T , T > 0 known, whenever the sample mean x (GREATERTHEQ) T/2.

(ii) Broeder 1955 shows that the maximum likelihood estimator of the scale parameter of a truncated gamma distribution, with the shape parameter being known, becomes …

On The Linear Relation Between Mb And Ms For Discrimination Between Explosions And Earthquakes, Ali A. Nowroozi

OES Faculty Publications

Summary. The statistical capability of the m_b :M_s, discriminant for the discrimination of earthquake and explosion populations is examined by application of discriminant functions to a group of 83 explosions and 72 earthquakes in Eurasia. Equations are derived for the probability that an event is an earthquake or an explosion. The positive sign of DIS in the decision index equation,

DIS, = 34.3383 - 11.9569 mb_i, + 7.1 161 M_si,

indicates that the event i is an earthquake. Its negative sign indicates that event i is an explosion. The probability of …

Sediment Processing And Selective Feeding By Pectinaria Koreni (Polychaeta: Pectinariidae), Fred C. Dobbs, Teresa A. Scholly

OES Faculty Publications

Pectinaria (Lagis) koreni (Malmgren) is an abundant, deposit-feeding, infaunal inhabitant of shallow-water marine environments in northern Europe. Laboratory experiments were performed to quantify the polychaete's sediment processing in 2 distinct sediments, 1 fine-grained and high in combustibles, the other coarse-grained and low in combustibles. Gut passage time and time to pseudodefecation were predictable only in coarse-grained sediment. In both sediments, reworking rate increased with worm size and over time, although temporal patterns differed in the 2 sediments. The ratio of pseudodefecated sediment to defecated sediment did not differ significantly over time in either sediment, but the ratio was greater in …

In Situ Growth And Chemical Composition Of The Giant Kelp, Macrocystis Pyrifera: Response To Temporal Changes In Ambient Nutrient Availability, Richard C. Zimmerman, James N. Kremer

OES Faculty Publications

Temporal variations in growth of the giant kelp Macrocystis pyrifera were examined in relation to ambient nutrient availability and chemical composition of mature blades, the primary site of nutrient and carbohydrate storage in M. pyrifera. The effect of nutrient availability on growth was well approximated by a Monod rectangular hyperbola, with growth saturating at ambient nitrate concentra- tions between 1 and 2 FM. M. pyrlfera was unable to generate nutrient reserves that would last beyond 30 d. Nitrogen reserves were stored as free amino acids, and generally constituted about 10 % of total tissue nitrogen. Total nitrogen content was …

Faceting At The Silicon (100) Crystal-Melt Interface: Theory And Experiment, Uzi Landman, W.D. Luedtke, R.N. Barnett, C.L. Cleveland, M.W. Ribarsky, Emil Arnold, S. Ramesh, H. Baumgart, A. Martinez, B. Khan

Electrical & Computer Engineering Faculty Publications

Molecular-dynamics simulations and in situ experimental observations of the melting and equilibrium structure of the crystalline Si(100)-melt interface are described. The equilibrium interface is structured, exhibiting facets established on (111) planes.

Silicon-On-Insulator Technology By Crystallization On Quartz Substrates, Helmut Baumgart

Electrical & Computer Engineering Faculty Publications

The purpose of the novel zone-melting recrystallization process (ZMR) is to produce single crystalline Si films on Si02 of high crystalline perfection, which are suitable for device fabrication and subsequent industrial applications. However, silicon films grown on amorphous insulating substrates without seeding contain regularly spaced subgrain boundaries as their predominant growth defect and to a lesser degree twin boundaries and some grain boundaries. Detailed materials studies have revealed the core structure of these extended defects and the fundamental mechanisms responsible for subgrain boundary formation. The nature and origin of subgrain boundaries is reviewed and a model for polygonization of the …

Absorption Cross-Sections Of Sodium Diatomic Molecules, Zeng-Shevan Fong

Physics Theses & Dissertations

The absorption cross sections of sodium dimers were studied using a heat pipe over operating in the non-heat-pipe mode. Three wavelength regions were observed. They are in the red, the green-blue, and the near ultraviolet regions. The absorption cross section depends on the wavelength of the incident light. Representative peak values for the v"=0 progression in the red and green-blue regions are 2.59 A sup 2 (average value) and 11.77 A sup 2 (T_ave=624 K). The value for the C greater than X transitions is several tenths A sup 2. The cross sections were measured from absorption spectra …