Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Physical Sciences and Mathematics (36)
- Arts and Humanities (27)
- Life Sciences (22)
- History (19)
- Education (18)
-
- Oceanography (17)
- Oceanography and Atmospheric Sciences and Meteorology (17)
- United States History (16)
- Social and Behavioral Sciences (13)
- Physics (10)
- American Studies (9)
- Animal Sciences (9)
- Marine Biology (9)
- Psychology (8)
- Aquaculture and Fisheries (7)
- Race, Ethnicity and Post-Colonial Studies (7)
- Condensed Matter Physics (6)
- Environmental Sciences (6)
- African History (5)
- Ecology and Evolutionary Biology (5)
- Engineering (5)
- Student Counseling and Personnel Services (5)
- Zoology (5)
- African American Studies (4)
- Chemistry (4)
- Earth Sciences (4)
- Electrical and Computer Engineering (4)
- Fresh Water Studies (4)
- Personality and Social Contexts (4)
- Anthropology (3)
Articles 61 - 89 of 89
Full-Text Articles in Entire DC Network
Breaking With Tradition: Slave Literacy In Early Virginia, 1680--1780, Antonio T. Bly
Breaking With Tradition: Slave Literacy In Early Virginia, 1680--1780, Antonio T. Bly
Dissertations, Theses, and Masters Projects
"Breaking with Tradition" is a study of slave literacy in eighteenth-century British North America, the era of the First Great Awakening and the American Revolution. Instead of highlighting the work of a few northern slave authors (the present emphasis in African American literary history), it focuses on the relationship between slave education in colonial Virginia and the social and political circumstances in which slaves acquired a knowledge of letters. A social history of life in the slave quarters, the "great house," and in towns, "Breaking with Tradition" is at once a case study of slaves reading and writing in the …
Silicon Oxynitride: A Field Emission Suppression Coating, Nimel D. Theodore
Silicon Oxynitride: A Field Emission Suppression Coating, Nimel D. Theodore
Dissertations, Theses, and Masters Projects
We have studied coatings deposited using our inductively-coupled RF plasma ion implantation and desposition system to suppress field emission from large, 3-D electrode structures used in high voltage applications, like those used by Thomas Jefferson National Accelerator Facility in their DC-field photoelectron gun. Currently time and labor-intensive hand-polishing procedures are used to minimize field emission from these structures. Previous work had shown that the field emission from polished stainless steel (27 muA of field-emitted current at 15 MV/m) could be drastically reduced with simultaneous deposition of sputtered silicon dioxide during nitrogen implantation (167 pA of field-emitted current at 30 MV/m). …
Passive Available Bandwidth: Applying Self -Induced Congestion Analysis Of Application-Generated Traffic, Marcia Zangrilli Bryan
Passive Available Bandwidth: Applying Self -Induced Congestion Analysis Of Application-Generated Traffic, Marcia Zangrilli Bryan
Dissertations, Theses, and Masters Projects
Monitoring end-to-end available bandwidth is critical in helping applications and users efficiently use network resources. Because the performance of distributed systems is intrinsically linked to the performance of the network, applications that have knowledge of the available bandwidth can adapt to changing network conditions and optimize their performance. A well-designed available bandwidth tool should be easily deployable and non-intrusive. While several tools have been created to actively measure the end-to-end available bandwidth of a network path, they require instrumentation at both ends of the path, and the traffic injected by these tools may affect the performance of other applications on …
Society Of Souls: Spirit, Friendship, And The Antebellum Reform Imagination, Robert Kent Nelson
Society Of Souls: Spirit, Friendship, And The Antebellum Reform Imagination, Robert Kent Nelson
Dissertations, Theses, and Masters Projects
This study explores the central role that a spiritualized friendship played in the thought and writings of antebellum reformers. It identifies a spiritual sensibility that was widely shared by many radical New England activists of the 1830s, 1840s, and 1850s regardless of their specific denominational beliefs, and argues that this sense of spirituality motivated them to become activists who labored to transform their society.;Specifically, this dissertation analyzes the work and writings of a variety of reformers who believed that spirit or soul could serve as a mechanism for leveling some of the most dominant cultural and institutional power hierarchies of …
Uv Cure Kinetics Of Dimethacrylate Thin And Thick Samples, Yuemei Zhang
Uv Cure Kinetics Of Dimethacrylate Thin And Thick Samples, Yuemei Zhang
Dissertations, Theses, and Masters Projects
UV curing is using UV light as the energy source to induce the polymerization of liquid monomers and oligomers to form a solid polymer. Because UV polymerization is fast and energy-saving and a UV curable system has no VOC (volatile organic compound), this new technology has developed rapidly from thin film applications to thick sample applications. In addition, since the UV cure process can be controlled spatially and temporally, it also has an important application to make gradient materials with locally optimized properties. However, most research on UV cure is based on thin film applications, and the cure kinetics of …
Studies Of Energy Recovery Linacs At Jefferson Laboratory: 1 Gev Demonstration Of Energy Recovery At Cebaf And Studies Of The Multibunch, Multipass Beam Breakup Instability In The 10 Kw Fel Upgrade Driver, Christopher D. Tennant
Studies Of Energy Recovery Linacs At Jefferson Laboratory: 1 Gev Demonstration Of Energy Recovery At Cebaf And Studies Of The Multibunch, Multipass Beam Breakup Instability In The 10 Kw Fel Upgrade Driver, Christopher D. Tennant
Dissertations, Theses, and Masters Projects
An energy recovering linac (ERL) offers an attractive alternative for generating intense electron beams by approaching the operational efficiency of a storage ring while maintaining the superior beam quality typical of a linear accelerator. Two primary physics challenges exist in pushing the frontier of ERL performance. The first is energy recovering a high energy beam while demonstrating operational control of two coupled beams in a common transport channel. The second is controlling the high average current effects in ERLs, specifically a type of beam instability called multipass beam breakup (BBU). This work addresses each of these issues.;A successful 1 GeV …
The Effect Of Workload Dependence In Systems: Experimental Evaluation, Analytic Models, And Policy Development, Qi Zhang
Dissertations, Theses, and Masters Projects
This dissertation presents an analysis of performance effects of burstiness (formalized by the autocorrelation function) in multi-tiered systems via a 3-pronged approach, i.e., experimental measurements, analytic models, and policy development. This analysis considers (a) systems with finite buffers (e.g., systems with admission control that effectively operate as closed systems) and (b) systems with infinite buffers (i.e., systems that operate as open systems).;For multi-tiered systems with a finite buffer size, experimental measurements show that if autocorrelation exists in any of the tiers in a multi-tiered system, then autocorrelation propagates to all tiers of the system. The presence of autocorrelated flows in …
Field Emission Study Of Carbon Nanostructures, Xin Zhao
Field Emission Study Of Carbon Nanostructures, Xin Zhao
Dissertations, Theses, and Masters Projects
Recently, carbon nanosheets (CNS), a novel nanostructure, were developed in our laboratory as a field emission source for high emission current. to characterize, understand and improve the field emission properties of CNS, a ultra-high vacuum surface analysis system was customized to conduct relevant experimental research in four distinct areas. The system includes Auger electron spectroscopy (AES), field emission energy spectroscopy (FEES), field emission I-V testing, and thermal desorption spectroscopy (TDS). Firstly, commercial Mo single tips were studied to calibrate the customized system. AES and FEES experiments indicate that a pyramidal nanotip of Ca and O elements formed on the Mo …
"They Opened The Door Too Late": African Americans And Baseball, 1900-1947, Sarah L. Trembanis
"They Opened The Door Too Late": African Americans And Baseball, 1900-1947, Sarah L. Trembanis
Dissertations, Theses, and Masters Projects
During Jim Crow, the sport of baseball served as an important arena for African American resistance and negotiation. as a (mostly) black enterprise, the Negro Leagues functioned as part of a larger African American movement to establish black commercial ventures during segregation. Moreover, baseball's special status as the national pastime made it a significant public symbol for African American campaigns for integration and civil rights.;This dissertation attempts to interrogate the experience and significance of black baseball during Jim Crow during the first half of the twentieth century. Relying on newspapers, magazines, memoirs, biographies, and previously published oral interviews, this work …
Floristic Quality Index: Ecological And Management Implications In Created And Natural Wetlands, Douglas A. Deberry
Floristic Quality Index: Ecological And Management Implications In Created And Natural Wetlands, Douglas A. Deberry
Dissertations, Theses, and Masters Projects
We applied the Floristic Quality Index (FQI) to vegetation data collected across a chronosequence of created wetland (CW) sites in Virginia ranging in age from one to 15 years post-construction. at each site, we also applied FQI to a nearby forested reference wetland (REF), for a total of 30 sites (15 created, 15 reference). We tested the performance of the index against a selection of community metrics (species richness, diversity, evenness, percent native species) and site attributes (age, soil physiochemical variables). The relationship between FQI and community and environmental variables was analyzed with Spearman's rank order correlation coefficient and Canonical …
Developing A Stock Assessment For The Barndoor Skate (Dipturus Laevis) In The Northeast United States, Todd Gedamke
Developing A Stock Assessment For The Barndoor Skate (Dipturus Laevis) In The Northeast United States, Todd Gedamke
Dissertations, Theses, and Masters Projects
The barndoor skate Dipturus laevis is one of seven species in the United States Northwest Atlantic skate complex. The species received little attention until a recent article published in Science reported that the barndoor skate might be on the brink of extinction. In this study, we address not only the virtual lack of information on the life history of the species, but also develop methodologies to assist in the assessment of the barndoor skate population. to investigate the life history of the species, data were collected from 2,310 specimens caught during commercial sea scallop dredging in the southern section of …
Linking Land To Ocean: Flux And Fate Of Water And Sediment From The Yangtze River To The East China Sea, Kehui Xu
Dissertations, Theses, and Masters Projects
Although precipitation and runoff for the entire Yangtze River watershed have changed little since 1950, the increase of runoff in Yangtze southern sub-basin has been much larger than that of precipitation, reflecting decreased temperatures and evapotranspiration, In contrast, the marked decreases in runoff in northern Yangtze have been due mainly to increased water consumption. Since the 1980s, the Yangtze sediment load has declined dramatically, and 2004 loads at Yichang (just below the Three Gorges Dam - TGD) and Datong (lower stream) were only 12% and 33% of those in the 1950s and 60s, reflecting precipitation decline, landuse change, and most …
Migratory And Spawning Behavior Of American Shad In The James River, Virginia, Aaron W. Aunins
Migratory And Spawning Behavior Of American Shad In The James River, Virginia, Aaron W. Aunins
Dissertations, Theses, and Masters Projects
No abstract provided.
Development Of An Unstructured Grid, Finite Volume Eutrophication Model For The Shallow Water Coastal Bay: Application In The Lynnhaven River Inlet System, Yuepeng Li
Dissertations, Theses, and Masters Projects
The shallow water region is an important portion of the estuarine and coastal waters, since it encompasses the entire land-water margin as the buffer zone and supports one of the most productive ecosystems. When light can penetrate to the sediment, it triggers the benthic microalgae community to perform photosynthesis, resulting in a benthic-pelagic exchange flux different from that of the deeper water. This study utilized the laboratory-measured benthic flux, and a suite of well-calibrated numerical models to examine the eutrophication process in the Lynnhaven River Inlet system with special emphasis on: the role played by benthic microalgae, and nutrient budgets …
Sources Of Mortality, Movements And Behavior Of Sea Turtles In Virginia, Katherine Lamont. Mansfield
Sources Of Mortality, Movements And Behavior Of Sea Turtles In Virginia, Katherine Lamont. Mansfield
Dissertations, Theses, and Masters Projects
Aerial surveys are commonly used to evaluate in-water sea turtle abundances. A correction is applied to account for turtles diving below the observed surface. Historically, observations of summer/fall surfacing behavior were used for this correction, assuming constant behavior among seasons. Using radio/acoustic telemetry, seasonal differences in sea turtle surfacing behavior were determined among Kemp's ridleys and loggerheads. Mean time spent at surface in the spring ranged between 9.9%-30.0% with significant differences among individuals. Observed surfacing times were higher than historic summer/fall observations (Byles 1988; 5.3%), indicating that historic springtime abundances were overestimated by 50%-80%. Aerial surveys (2001-2004) indicated a 65%-75% …
Physical Processes Behind Delta Propagation And Flood Layer Dynamics, Po River, Italy, Aaron J. Bever
Physical Processes Behind Delta Propagation And Flood Layer Dynamics, Po River, Italy, Aaron J. Bever
Dissertations, Theses, and Masters Projects
Rivers discharge around 20 billion tonnes of sediment to the coastal ocean each year (Milliman and Syvitski, 1992). Many supply dominated rivers possess large subareal and subaqueous deltas, whose growth depends on the physical processes controlling sediment deposition or removal. There has yet to be a complete understanding of how short term processes such as settling from buoyant plumes, wave/current resuspension, and transport by currents and gravity flows, interact to produce the depositional products that develop over varying timescales. The Po River in Northern Italy forms a substantial delta in the Adriatic Sea. It has five distributary mouths, and is …
An Investigation Of Virginia School Leaders' Knowledge And Perceptions Regarding The Impact Of The Discipline Provisions Of The Individuals With Disabilities Education Act On School Safety And Professional Development, Charlotte Hardison Worley
An Investigation Of Virginia School Leaders' Knowledge And Perceptions Regarding The Impact Of The Discipline Provisions Of The Individuals With Disabilities Education Act On School Safety And Professional Development, Charlotte Hardison Worley
Dissertations, Theses, and Masters Projects
This research examined the knowledge level and perceptions of 300 randomly selected school leaders in the Commonwealth of Virginia concerning the discipline provisions of the Individuals with Disabilities Education Act of 1997 (IDEA 97). The overarching questions answered in the study were (1) to what extent are school leaders aware of the existing discipline provisions of IDEA 97 which have been in place since 2001; and (2) how do school leaders view the impact of those provisions on their ability to maintain a safe learning environment for all?;Findings resulted in one significant difference (p<.05) among school leaders in the sub-domain of Knowledge. Elementary leaders reported a significantly lower level of knowledge regarding the discipline provisions of IDEA 97 than did their middle school peers. School leaders across knowledge domains and school levels reported that the discipline provisions of IDEA 97 did not negatively impact their ability to maintain safe schools. Moreover, professional development was identified by school leaders in the study as a high need to manage the discipline provisions of IDEA 97 across all school levels.
Physiological Consequences Of High Water Flow On The Coral Montastrea Annularis (Ellis And Solander, 1786), Lawrence W. Carpenter
Physiological Consequences Of High Water Flow On The Coral Montastrea Annularis (Ellis And Solander, 1786), Lawrence W. Carpenter
Dissertations, Theses, and Masters Projects
Water-flow is a vital component to the life histories of sessile marine invertebrates and essential to the structure and function of coral reefs. Recent studies have identified water-flow as an asset in the resistance to and recovery from short-term bleaching events of high irradiance and thermal increases. to determine whether the benefits of water-flow scale from the landscape level down to the flow patterns experienced over individual polyps and to quantify potential metabolic consequences, three studies were performed on Montastrea annularis (Ellis and Solander, 1786), using in situ heated bleaching flow-chambers during two saturation missions at the Aquarius underwater laboratory. …
Sources And Composition Of Particulate Organic Matter In The Sacramento-San Joaquin River Delta, California, Vicki Pilon
Sources And Composition Of Particulate Organic Matter In The Sacramento-San Joaquin River Delta, California, Vicki Pilon
Dissertations, Theses, and Masters Projects
Determining organic matter sources and their availability to higher organisms is essential to better understanding the link between organic matter (OM) dynamics and secondary production, particularly in highly-disturbed river-delta systems. The San Francisco Bay and its associated Delta, is one of the most modified aquatic systems, and is the focus of an ongoing restoration effort. Particulate organic matter (POM) and surficial sediments were collected in the Sacramento-San Joaquin River Delta, CA to document temporal and spatial variations in biochemical, (total protein, carbohydrate and lipid), lipid biomarker, and total hydrolysable amino acid (THAA) composition. Sources, composition and nutritional quality of OM …
Conceptions Of Morality Held By Eminent People, Janine Mary Lehane
Conceptions Of Morality Held By Eminent People, Janine Mary Lehane
Dissertations, Theses, and Masters Projects
No abstract provided.
The Relationship Between Racial Attitudes, Ego Developmental Level And Multicultural Counseling Knowledge And Awareness In School Psychologists, Valerie K. Mcdonald
The Relationship Between Racial Attitudes, Ego Developmental Level And Multicultural Counseling Knowledge And Awareness In School Psychologists, Valerie K. Mcdonald
Dissertations, Theses, and Masters Projects
No abstract provided.
America's Other Peculiar Institution: Exploring The York County Free Black Register As A Means Of Social Control, 1798-1831, Andrew Jefferson Butts
America's Other Peculiar Institution: Exploring The York County Free Black Register As A Means Of Social Control, 1798-1831, Andrew Jefferson Butts
Dissertations, Theses, and Masters Projects
No abstract provided.
Our Great Physicist: Professor Joseph Henry Of Princeton And The Rise Of Science In The Antebellum College, Sarah Swords
Our Great Physicist: Professor Joseph Henry Of Princeton And The Rise Of Science In The Antebellum College, Sarah Swords
Dissertations, Theses, and Masters Projects
No abstract provided.
Conflict, Coexistence, And Community: Settlement Politics And The Emergence Of A Social Network In Proprietary South Carolina, 1670-1700, Paul Philip Musselwhite
Conflict, Coexistence, And Community: Settlement Politics And The Emergence Of A Social Network In Proprietary South Carolina, 1670-1700, Paul Philip Musselwhite
Dissertations, Theses, and Masters Projects
No abstract provided.
Motive-Goal Congruence: Normative Congruence, Ipsative Congruence And Mindfulness, Anne Lytton Hurst
Motive-Goal Congruence: Normative Congruence, Ipsative Congruence And Mindfulness, Anne Lytton Hurst
Dissertations, Theses, and Masters Projects
No abstract provided.
Application Of Dimensional Personality Models To Personality Disorders, Erik Pettersson
Application Of Dimensional Personality Models To Personality Disorders, Erik Pettersson
Dissertations, Theses, and Masters Projects
No abstract provided.
Automated Peak Identification For Time -Of -Flight Mass Spectroscopy, Haijian Chen
Automated Peak Identification For Time -Of -Flight Mass Spectroscopy, Haijian Chen
Dissertations, Theses, and Masters Projects
The high throughput capabilities of protein mass fingerprints measurements have made mass spectrometry one of the standard tools for proteomic research, such as biomarker discovery. However, the analysis of large raw data sets produced by the time-of-flight (TOF) spectrometers creates a bottleneck in the discovery process. One specific challenge is the preprocessing and identification of mass peaks corresponding to important biological molecules. The accuracy of mass assignment is another limitation when comparing mass fingerprints with databases.;We have developed an automated peak picking algorithm based on a maximum likelihood approach that effectively and efficiently detects peaks in a time-of-flight secondary ion …
Measurement Of Electroweak Asymmetries In Vector Electron Positron Scattering At 0.1 Less Than Q(2) Less Than 0.4 (Gev/C)(2), Jeffery A. Secrest
Measurement Of Electroweak Asymmetries In Vector Electron Positron Scattering At 0.1 Less Than Q(2) Less Than 0.4 (Gev/C)(2), Jeffery A. Secrest
Dissertations, Theses, and Masters Projects
This work is based on the first engineering run of the G 0 experiment from October 2002 though January 2003 in Hall C at Jefferson Lab. The G0 experiment will be the first to measure the weak neutral form factors: GEZ( Q2), GMZ( Q2) and GAe( Q2) and to extract the proton's strange form factors: GEs(Q2) and GMs(Q 2) via a Rosenbluth separation over a range of Q 2 (0.1--1.0 (GeV/c)2). This will require four sets of measurements: forward angle measurements with a proton target, and three sets of backward angle measurements with a hydrogen and deuterium target. The measurements …
Carbon Nanosheets And Carbon Nanotubes By Rf Pecvd, Mingyao Zhu
Carbon Nanosheets And Carbon Nanotubes By Rf Pecvd, Mingyao Zhu
Dissertations, Theses, and Masters Projects
A planar antenna RF plasma enhanced chemical vapor deposition apparatus was built for carbon nanostructure syntheses. When operated in inductive and capacitive plasma discharging modes, two carbon nanostructures, carbon nanotube (CNT) and carbon nanosheet (CNS), were synthesized, respectively.;A nanosphere lithography method was developed and used to prepare catalyst patterns for CNT growth. Using capacitively coupled C2H2/NH 3 plasma, randomly oriented CNT were synthesized on Ni dot patterned Si substrates. Aligned CNT arrays were grown on SiO2 coated Si substrates, using both C2H2/NH3 and CH 4/H2 capacitive plasmas.;When operated in inductive coupling mode, CNS were successfully deposited on a variety of …