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Digital Scholarship 2009
The work is a bibliography of digital scholarship containing citations of articles, books, and technical reports on institutional repositories and scholarly electronic publishing
Date:
2010
Creator:
Bailey, Charles W.
Object Type:
Text
System:
The UNT Digital Library
An Exploratory Study of the Impact of Institutional Policies and Practices of Community and Technical Colleges in Texas on Student Persistence in Online Courses
Online education is the fastest growing form of course delivery of higher education in the United States. It has revolutionized how students and instructors interact in the educational process. Yet students in online courses continue to experience higher attrition rates than their counterparts in traditional face-to-face classes despite the advantages offered by the technology. This study examined the impact that institutional policies and practices at community colleges in the state of Texas have had on student persistence in online courses. It also examined how institutions collect and use data in addressing students' attrition. The findings were used to identify the most effective institutional practices to share with community college systems in Texas in an effort to improve student persistence in online courses across the state. The population for the study consisted of the 50 public two-year community college and the technical college systems in the state of Texas. The study used a mixed method. A theoretical model of institutional impact on online persistence was drawn from the literature review. This model's five categories were then used to construct a survey to collect data on institutional practices and measure the effectiveness in addressing student persistence. Four college systems were identified using …
Date:
December 2010
Creator:
Hills, Fred W.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
SAPLE: Sandia Advanced Personnel Locator Engine.
We present the Sandia Advanced Personnel Locator Engine (SAPLE) web application, a directory search application for use by Sandia National Laboratories personnel. SAPLE's purpose is to return Sandia personnel 'results' as a function of user search queries, with its mission to make it easier and faster to find people at Sandia. To accomplish this, SAPLE breaks from more traditional directory application approaches by aiming to return the correct set of results while placing minimal constraints on the user's query. Two key features form the core of SAPLE: advanced search query interpretation and inexact string matching. SAPLE's query interpretation permits the user to perform compound queries when typing into a single search field; where able, SAPLE infers the type of field that the user intends to search on based on the value of the search term. SAPLE's inexact string matching feature yields a high-quality ranking of personnel search results even when there are no exact matches to the user's query. This paper explores these two key features, describing in detail the architecture and operation of SAPLE. Finally, an extensive analysis on logged search query data taken from an 11-week sample period is presented.
Date:
April 1, 2010
Creator:
Procopio, Michael J.
Object Type:
Report
System:
The UNT Digital Library
Understanding Fault Characteristics of Inverter-Based Distributed Energy Resources
This report discusses issues and provides solutions for dealing with fault current contributions from inverter-based distributed energy resources.
Date:
January 1, 2010
Creator:
Keller, J. & Kroposki, B.
Object Type:
Report
System:
The UNT Digital Library
PRESSURE DEVELOPMENT IN SEALED CONTAINERS WITH PLUTONIUM BEARING MATERIALS
Gas generation by plutonium-bearing materials in sealed containers has been studied. The gas composition and pressure are determined over periods from months to years. The Pu-bearing materials studied represent those produced by all of the major processes used by DOE in the processing of plutonium and include the maximum amount of water (0.5% by weight) allowed by DOE's 3013 Standard. Hydrogen generation is of high interest and the Pu-bearing materials can be classed according to how much hydrogen is generated. Hydrogen generation by high-purity plutonium oxides packaged under conditions typical for actual 3013 materials is minimal, with very low generation rates and low equilibrium pressures. Materials with chloride salt impurities have much higher hydrogen gas generation rates and result in the highest observed equilibrium hydrogen pressures. Other materials such as those with high metal oxide impurities generate hydrogen at rates in between these extremes. The fraction of water that is converted to hydrogen gas as equilibrium is approached ranges from 0% to 25% under conditions typical of materials packaged to the 3013 Standard. Generation of both hydrogen and oxygen occurs when liquid water is present. The material and moisture conditions that result in hydrogen and oxygen generation for high-purity plutonium …
Date:
February 1, 2010
Creator:
Duffey, J. & Livingston, R.
Object Type:
Article
System:
The UNT Digital Library
Imaging with Spherically Bent Crystals or Reflectors
This paper consists of two parts: Part I describes the working principle of a recently developed x-ray imaging crystal spectrometer, where the astigmatism of spherically bent crystals is being used with advantage to record spatially resolved spectra of highly charged ions for Doppler measurements of the ion-temperature and toroidal plasmarotation- velocity profiles in tokamak plasmas. This type of spectrometer was thoroughly tested on NSTX and Alcator C-Mod, and its concept was recently adopted for the design of the ITER crystal spectrometers. Part II describes imaging schemes, where the astigmatism has been eliminated by the use of matched pairs of spherically bent crystals or reflectors. These imaging schemes are applicable over a wide range of the electromagnetic radiation, which includes microwaves, visible light, EUV radiation, and x-rays. Potential applications with EUV radiation and x-rays are the diagnosis of laserproduced plasmas, imaging of biological samples with synchrotron radiation, and lithography.
Date:
June 1, 2010
Creator:
Bitter, M.; Hill, K. W.; Scott, S.; Ince-Cushman, A.; Reinke, M.; Podpaly, Y. et al.
Object Type:
Report
System:
The UNT Digital Library
New England Wind Forum: A Wind Powering America Project, Newsletter #5 -- January 2010, Wind and Hydropower Technologies Program (WHTP)
Wind Powering America program launched the New England Wind Forum (NEWF) in 2005 to provide a single comprehensive source of up-to-date, Web-based information on a broad array of wind energy issues pertaining to New England. The NEWF newsletter provides New England stakeholders with updates on wind energy development in the region. In addition to regional updates, Issue #5 offers an interview with Angus King, former governor of Maine and co-founder of Independence Wind.
Date:
January 1, 2010
Creator:
Grace, R. C. & Gifford, J.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Metabolic Design and Control for Production in Prokaryotes
Prokaryotic life on earth is manifested by its diversity and omnipresence. These microbes serve as natural sources of a large variety of compounds with the potential to serve the ever growing, medicinal, chemical and transportation needs of the human population. However, commercially viable production of these compounds can be realized only through significant improvement of the native production capacity of natural isolates. The most favorable way to achieve this goal is through the genetic manipulation of metabolic pathways that direct the production of these molecules. While random mutagenesis and screening have dominated the industrial production of such compounds in the past our increased understanding of microbial physiology over the last five decades has shifted this trend towards rational approaches for metabolic design. Major drivers of this trend include recombinant DNA technology, high throughput characterization of macromolecular cellular components, quantitative modeling for metabolic engine ring, targeted combinatorial engineering and synthetic biology. In this chapter we track the evolution of microbial engineering technologies from the black box era of random mutagenesis to the science and engineering-driven era of metabolic design.
Date:
November 10, 2010
Creator:
Chhabra, Swapnil R. & Keasling, J.D.
Object Type:
Book
System:
The UNT Digital Library
Antarctica X-band MiniSAR Crevasse Detection Radar : draft final report.
This document is the final report for the 2009 Antarctica Crevasse Detection Radar (CDR) Project. This portion of the project is referred to internally as Phase 2. This is a follow on to the work done in Phase 1 reported on in [1]. Phase 2 involved the modification of a Sandia National Laboratories MiniSAR system used in Phase 1 to work with an LC-130 aircraft that operated in Antarctica in October through November of 2009. Experiments from the 2006 flights were repeated, as well as a couple new flight tests to examine the effect of colder snow and ice on the radar signatures of 'deep field' sites. This document includes discussion of the hardware development, system capabilities, and results from data collections in Antarctica during the fall of 2009.
Date:
August 1, 2010
Creator:
Sander, Grant J. & Bickel, Douglas Lloyd
Object Type:
Report
System:
The UNT Digital Library
Water vulnerabilities for existing coal-fired power plants.
This report was funded by the U.S. Department of Energy's (DOE's) National Energy Technology Laboratory (NETL) Existing Plants Research Program, which has an energy-water research effort that focuses on water use at power plants. This study complements the Existing Plants Research Program's overall research effort by evaluating water issues that could impact power plants. Water consumption by all users in the United States over the 2005-2030 time period is projected to increase by about 7% (from about 108 billion gallons per day [bgd] to about 115 bgd) (Elcock 2010). By contrast, water consumption by coal-fired power plants over this period is projected to increase by about 21% (from about 2.4 to about 2.9 bgd) (NETL 2009b). The high projected demand for water by power plants, which is expected to increase even further as carbon-capture equipment is installed, combined with decreasing freshwater supplies in many areas, suggests that certain coal-fired plants may be particularly vulnerable to potential water demand-supply conflicts. If not addressed, these conflicts could limit power generation and lead to power disruptions or increased consumer costs. The identification of existing coal-fired plants that are vulnerable to water demand and supply concerns, along with an analysis of information about their …
Date:
August 19, 2010
Creator:
Elcock, D.; Kuiper, J. & Division, Environmental Science
Object Type:
Report
System:
The UNT Digital Library
Effect of atmosphere on collinear double-pulse laser-induced breakdown spectroscopy
Double pulse laser induced breakdown spectroscopy (DP-LIBS) has been shown to enhance LIBS spectra. Several researches have reported significant increases in signal-to-noise and or spectral intensity [1-4]. In addition to DP-LIBS, atmospheric conditions can also increase spectra intensity. For example, Iida [5] found that He and Ar both increase LIBS intensity compared to air at one 1 atm. It was also found that as the pressure was decreased to 100 Torr, LIBS intensity increased in Ar and air for single pulse (SP) LIBS. In this study, a collinear DP-LIBS scheme is used along with manipulation of the atmospheric conditions. The DP-LIBS scheme consists of a 355 nm ablative pulse fired into a sample contained in a vacuum chamber. A second analytical 1064 nm pulse is then fired 100 ns to 10 µs after and along the same path of the first pulse. Ar, He and air at pressures ranging from atmospheric pressure (630 Torr at elevation) to 10-5 Torr are introduced during DP-LIBS and SP-LIBS experiments. For a brass sample, a significant increase in spectral intensity of Cu and Zn lines were observed in DP-LIBS under Ar compared to DP-LIBS in air (Figure 1). It was also found that Cu …
Date:
September 1, 2010
Creator:
Effenberger, Andrew J., Jr. & Scott, Jill R.
Object Type:
Article
System:
The UNT Digital Library
Evaluation of Non-Nuclear Techniques for Well Logging: Technology Evaluation
This report presents an initial review of the state-of-the-art nuclear and non-nuclear well logging methods and seeks to understand the technical and economic issues if AmBe, and potentially other isotope sources, are reduced or even eliminated in the oil-field services industry. Prior to considering alternative logging technologies, there is a definite need to open up discussions with industry regarding the feasibility and acceptability of source replacement. Industry views appear to range from those who see AmBe as vital and irreplaceable to those who believe that, with research and investment, it may be possible to transition to electronic neutron sources and employ combinations of non-nuclear technologies to acquire the desired petro-physical parameters. In one sense, the simple answer to the question as to whether petro-physical parameters can be sensed with technologies other than AmBe is probably "Yes". The challenges come when attention turns to record interpretation. The many decades of existing records form a very valuable proprietary resource, and the interpretation of subtle features contained in these records are of significant value to the oil-gas exploration community to correctly characterize a well. The demonstration of equivalence and correspondence/correlation between established and any new sensing modality, and correlations with historic records is …
Date:
November 1, 2010
Creator:
Bond, Leonard J.; Denslow, Kayte M.; Griffin, Jeffrey W.; Dale, Gregory E.; Harris, Robert V.; Moran, Traci L. et al.
Object Type:
Report
System:
The UNT Digital Library
Texas Highways, Volume 57, Number 12, December 2010
Monthly travel magazine discussing locations and events in Texas to encourage travel within the state.
Date:
December 2010
Creator:
Texas. Travel Information Division.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Relative Humidity and the Susceptibility of Austenitic Stainless Steel to Stress Corrosion Cracking in an impure Plutonium Oxide Environment
Laboratory tests to investigate the corrosivity of moist plutonium oxide/chloride salt mixtures on 304L and 316L stainless steel coupons showed that corrosion occurred in selected samples. The tests exposed flat coupons for pitting evaluation and 'teardrop' stressed coupons for stress corrosion cracking (SCC) evaluation at room temperature to various mixtures of PuO{sub 2} and chloride-bearing salts for periods up to 500 days. The exposures were conducted in sealed containers in which the oxide-salt mixtures were loaded with about 0.6 wt % water from a humidified helium atmosphere. Observations of corrosion ranged from superficial staining to pitting and SCC. The extent of corrosion depended on the total salt concentration, the composition of the salt and the moisture present in the test environment. The most significant corrosion was found in coupons that were exposed to 98 wt % PuO{sub 2}, 2 wt % chloride salt mixtures that contained calcium chloride and 0.6 wt% water. SCC was observed in two 304L stainless steel teardrop coupons exposed in solid contact to a mixture of 98 wt % PuO{sub 2}, 0.9 wt % NaCl, 0.9 wt % KCl, and 0.2 wt % CaCl{sub 2}. The cracking was associated with the heat-affected zone of an autogenous …
Date:
May 5, 2010
Creator:
Zapp, P.; Duffey, J.; Lam, P. & Dunn, K.
Object Type:
Article
System:
The UNT Digital Library
COYOTE : a finite element computer program for nonlinear heat conduction problems. Part I, theoretical background.
The need for the engineering analysis of systems in which the transport of thermal energy occurs primarily through a conduction process is a common situation. For all but the simplest geometries and boundary conditions, analytic solutions to heat conduction problems are unavailable, thus forcing the analyst to call upon some type of approximate numerical procedure. A wide variety of numerical packages currently exist for such applications, ranging in sophistication from the large, general purpose, commercial codes, such as COMSOL, COSMOSWorks, ABAQUS and TSS to codes written by individuals for specific problem applications. The original purpose for developing the finite element code described here, COYOTE, was to bridge the gap between the complex commercial codes and the more simplistic, individual application programs. COYOTE was designed to treat most of the standard conduction problems of interest with a user-oriented input structure and format that was easily learned and remembered. Because of its architecture, the code has also proved useful for research in numerical algorithms and development of thermal analysis capabilities. This general philosophy has been retained in the current version of the program, COYOTE, Version 5.0, though the capabilities of the code have been significantly expanded. A major change in the code …
Date:
March 1, 2010
Creator:
Glass, Micheal W.; Hogan, Roy E., Jr. & Gartling, David K.
Object Type:
Report
System:
The UNT Digital Library
The Smart Grid: An Estimation of the Energy and CO2 Benefits
This report articulates nine mechanisms by which the smart grid can reduce energy use and carbon impacts associated with electricity generation and delivery. The quantitative estimates of potential reductions in electricity sector energy and associated CO2 emissions presented are based on a survey of published results and simple analyses. This report does not attempt to justify the cost effectiveness of the smart grid, which to date has been based primarily upon the twin pillars of cost-effective operation and improved reliability. Rather, it attempts to quantify the additional energy and CO2 emission benefits inherent in the smart grid’s potential contribution to the nation’s goal of mitigating climate change by reducing the carbon footprint of the electric power system.
Date:
January 15, 2010
Creator:
Pratt, Robert G.; Balducci, Patrick J.; Gerkensmeyer, Clint; Katipamula, Srinivas; Kintner-Meyer, Michael CW; Sanquist, Thomas F. et al.
Object Type:
Report
System:
The UNT Digital Library
The prediction of Neutron Elastic Scattering from Tritium for E(n) = 6-14 MeV
In a recent report Navratil et al. evaluated the angle-integrated cross section and the angular distribution for 14-MeV n+T elastic scattering by inferring these cross sections from accurately measured p+3He angular distributions. This evaluation used a combination of two theoretical treatments, based on the no-core shell model and resonating-group method (NCSM/RGM) and on the R-matrix formalism, to connect the two charge-symmetric reactions n+T and p+{sup 3}He. In this report we extend this treatment to cover the neutron incident energy range 6-14 MeV. To do this, we evaluate angle-dependent correction factors for the NCSM/RGM calculations so that they agree with the p+{sup 3}He data near 6 MeV, and using the results found earlier near 14 MeV we interpolate these correction factors to obtain correction factors throughout the 6-14 MeV energy range. The agreement between the corrected NCSM/RGM and R-Matrix values for the integral elastic cross sections is excellent ({+-}1%), and these are in very good agreement with total cross section experiments. This result can be attributed to the nearly constant correction factors at forward angles, and to the evidently satisfactory physics content of the two calculations. The difference in angular shape, obtained by comparing values of the scattering probability distribution P({mu}) …
Date:
June 14, 2010
Creator:
Anderson, J. D.; Dietrich, F. S.; Luu, T.; McNabb, D. P.; Navratil, P. & Quaglioni, S.
Object Type:
Report
System:
The UNT Digital Library
Observation of snake resonances at Relativistic Heavy Ion Collider
The Siberian snakes are powerful tools in preserving polarization in high energy accelerators has been demonstrated at the Brookhaven Relativistic Heavy Ion Collider (RHIC). Equipped with two full Siberian snakes in each ring, polarization is preserved during acceleration from injection to 100 GeV. However, the Siberian snakes also introduce a new set of depolarization resonances, i.e. snake resonances as first discovered by Lee and Tepikian. The intrinsic spin resonances above 100 GeV are about a factor of two stronger than those below 100 GeV which raises the challenge to preserve the polarization up to 250 GeV. In 2009, polarized protons collided for the first time at the RHIC design store energy of 250 GeV. This paper presents the experimental measurements of snake resonances at RHIC. The plan for avoiding these resonances is also presented.
Date:
September 27, 2010
Creator:
Bai, M.; Ahrens, L.; Alekseev, I.G.; Alessi, J. & al, et
Object Type:
Article
System:
The UNT Digital Library
Texas Journal on Civil Liberties & Civil Rights, Volume 15, Number 2, Spring 2010
Biannual journal containing articles, notes, and other analyses of law and legal cases related to civil liberties and rights in the United States.
Date:
Spring 2010
Creator:
University of Texas at Austin. School of Law.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Evaluating existing culverts for load capacity allowing for soil structure interaction
Report on a study exploring culvert load-rating practices and procedures and finding ways to address the discrepancies between actual culvert performance and culvert analysis practices. The study used the Texas Department of Transportation's archive of culvert designs and inventory of 13,000 in-service reinforced concrete box culverts as the basis of their data.
Date:
December 2010
Creator:
Lawson, William D.; Wood, Timothy A.; Newhouse, Charles D. & Jayawickrama, Priyantha W.
Object Type:
Report
System:
The Portal to Texas History
Texas Law Review, Volume 88, Number 7, June 2010
Journal containing articles, notes, book reviews, and other analyses of law and legal cases.
Date:
June 2010
Creator:
Texas Law Review Association
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Promoting Workforce Development for the Transportation Profession Through a Multi-University/Agency Partnership: Final Report
"The objective of this multi-university/agency partnership between Prairie View A&M University (PVAMU), Texas Transportation Institute (TTI), and Texas A&M University (TAMU) is to build on the progress made through the UTCM seed funding to produce high-quality transportation professionals from underrepresented groups through research and other real-world experiences."
Date:
December 15, 2010
Creator:
Kommalapati, Raghava; Perkins, Judy; Jasek, Deborah; Stockton, William & Benz, Robert J. (Robert Joseph)
Object Type:
Report
System:
The Portal to Texas History
Foundations to the unified psycho-cognitive engine.
This document outlines the key features of the SNL psychological engine. The engine is designed to be a generic presentation of cognitive entities interacting among themselves and with the external world. The engine combines the most accepted theories of behavioral psychology with those of behavioral economics to produce a unified simulation of human response from stimuli through executed behavior. The engine explicitly recognizes emotive and reasoned contributions to behavior and simulates the dynamics associated with cue processing, learning, and choice selection. Most importantly, the model parameterization can come from available media or survey information, as well subject-matter-expert information. The framework design allows the use of uncertainty quantification and sensitivity analysis to manage confidence in using the analysis results for intervention decisions.
Date:
October 1, 2010
Creator:
Bernard, Michael Lewis; Bier, Asmeret Brooke; Backus, George A.; Verzi, Stephen J. & Glickman, Matthew R.
Object Type:
Report
System:
The UNT Digital Library
Long-Term Monitoring at the East and West Flower Garden Banks, 2004-2008, Volume 1: Technical Report
A report describing the monitoring of the East and West Flower Garden Bank in accordance with the long-term monitoring protocol.
Date:
December 2010
Creator:
Zimmer, Beth; Duncan, Leslie; Aronson, Richard B.; Deslarzes, Kenneth J. P.; Deis, Donald R.; Robbart, Martha L. et al.
Object Type:
Text
System:
The UNT Digital Library