Partner
UNT Libraries Government Documents Department
545
UNT Libraries
195
Oklahoma Historical Society
107
Sterling Municipal Library
31
UNT Libraries Special Collections
31
Sweetwater/Nolan County City-County Library
25
National Museum of the Pacific War/Admiral Nimitz Foundation
22
UNT College of Information
15
Bastrop Public Library
9
Carl Albert Congressional Research and Studies Center
9
48 More
Collection
Office of Scientific & Technical Information Technical Reports
310
Texas Digital Newspaper Program
293
Congressional Research Service Reports
157
Oklahoma Digital Newspaper Program
121
Tocker Foundation Grant
106
UNT Theses and Dissertations
100
The Greensheet
72
Government Accountability Office Reports
36
The Baytown Sun
31
Chickasha Newspaper Collection
26
91 More
Degree Department
Department of Psychology
11
College of Music
10
Department of History
8
Music
8
College of Information
7
Department of English
6
Department of Teacher Education and Administration
6
Department of Biological Sciences
4
Department of Computer Science and Engineering
4
Department of Educational Psychology
4
35 More
Degree Discipline
Degree Level
Country
States
Year
Month
Results:
1 - 24 of
1,172
next
CRYSTALLIZATION IN HIGH-LEVEL WASTE GLASSES U.S. DEPARTMENT OF ENERGY OFFICE OF RIVER PROTECTION WTP ENGINEERING DIVISION
Various circumstances influence crystallization in glassmaking, for example: (1) crystals nucleate and grow before the glass-forming melt occurs; (2) crystals grow or dissolve in flowing melt and during changing temperature; (3) crystals move under the influence of gravity; (4) crystals agglomerate and interact with gas bubbles; (5) high-level wastes (HLW) are mixtures of a large number of components in unusual proportions; (6) melter processing of HLW and the slow cooling of HLW glass in canisters provides an opportunity for a variety of crystalline forms to precipitate; (7) settling of crystals in a HLW glass melter may produce undesirable sludge at the melter bottom; and (8) crystallization of the glass product may increase, but also ruin chemical durability. The conclusions are: (1) crystal growth and dissolution typically proceed in a convective medium at changing temperature; (2) to represent crystallization or dissolution the kinetics must be expressed in the form of rate equations, such as dC/dt = f(C,T) and the temperature dependence of kinetic coefficients and equilibrium concentrations must be accounted for; and (3) non-equilibrium phenomena commonly occur - metastable crystallization, periodic distribution of crystals; and dendritic crystal growth.
Date:
August 19, 2009
Creator:
AA, KRUGER & PR, HRMA
Object Type:
Article
System:
The UNT Digital Library
Measurement of d sigma/dy of Drell-Yan e+ e- pairs in the Z Mass Region from p anti-p Collisions at s88(1/2) = 1.96-TeV
We report on a CDF measurement of the total cross section and rapidity distribution, d{sigma}/dy, for q{bar q} {yields} {gamma}*/Z {yields} e{sup +}e{sup -} events in the Z boson mass region (66 < M{sub ee} < 116 GeV/c{sup 2}) produced in p{bar p} collisions at {radical}s = 1.96 TeV with 2.1 fb{sup -1} of integrated luminosity. The measured cross section of 256 {+-} 16 pb and d{sigma}/dy distribution are compared with Next-to-Leading-Order and Next-to-Next-to-Leading-Order QCD theory predictions with CTEQ and MRST parton distribution functions (PDFs). There is good agreement between data and theory except at large rapidity for which further tuning of PDF models may be needed.
Date:
August 1, 2009
Creator:
Aaltonen, T.; Phys., /Helsinki Inst. of; Adelman, J.; /Chicago U., EFI; Akimoto, T.; U., /Tsukuba et al.
Object Type:
Article
System:
The UNT Digital Library
A Search for the Higgs Boson Produced in Association with $Z\to \ell^+\ell^-$ Using the Matrix Element Method at CDF II
We present a search for associated production of the standard model (SM) Higgs boson and a Z boson where the Z boson decays to two leptons and the Higgs decays to a pair of b quarks in p{bar p} collisions at the Fermilab Tevatron. We use event probabilities based on SM matrix elements to construct a likelihood function of the Higgs content of the data sample. In a CDF data sample corresponding to an integrated luminosity of 2.7 fb{sup -1} we see no evidence of a Higgs boson with a mass between 100 GeV/c{sup 2} and 150 GeV/c{sup 2}. We set 95% confidence level (C.L.) upper limits on the cross-section for ZH production as a function of the Higgs boson mass m{sub H}; the limit is 8.2 times the SM prediction at m{sub H} = 115 GeV/c{sup 2}.
Date:
August 1, 2009
Creator:
Aaltonen, T.; Phys., /Helsinki Inst. of; Adelman, J.; /Chicago U., EFI; Akimoto, T.; U., /Tsukuba et al.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the W boson mass
The authors present a measurement of the W boson mass in W {yields} e{nu} decays using 1 fb{sup -1} of data collected with the D0 detector during Run II of the Fermilab Tevatron collider. With a sample of 499830 W {yields} e{nu} candidate events, they measure M{sub W} = 80.401 {+-} 0.043 GeV. This is the most precise measurement from a single experiment.
Date:
August 1, 2009
Creator:
Abazov, Victor Mukhamedovich; Abbott, Braden Keim; Abolins, Maris A.; Acharya, Bannanje Sripath; Adams, Mark Raymond; Adams, Todd et al.
Object Type:
Article
System:
The UNT Digital Library
AGR-1 Data Qualification Interim Report
Projects for the very-high-temperature reactor (VHTR) program provide data in support of Nuclear Regulatory Commission licensing of the VHTR. Fuel and materials to be used in the reactor are tested and characterized to quantify performance in high temperature and high fluence environments. The VHTR Program has established the NGNP Data Management and Analysis System (NDMAS) to ensure that VHTR data are (1) qualified for use, (2) stored in a readily accessible electronic form, and (3) analyzed to extract useful results. This document focuses on the first NDMAS objective. It describes the data streams associated with the first Advanced Gas Reactor (AGR-1) experiment, the processing of these data within NDMAS, and reports the interim FY09 qualification status of the AGR-1 data to date. Data qualification activities within NDMAS for specific types of data are determined by the data qualification category, which is assigned by the data generator, and include: (1) capture testing, to confirm that the data stored within NDMAS are identical to the raw data supplied, (2) accuracy testing, to confirm that the data are an accurate representation of the system or object being measured, and (3) documentation that the data were collected under an NQA-1 or equivalent QA program. …
Date:
August 1, 2009
Creator:
Abbott, Machael
Object Type:
Report
System:
The UNT Digital Library
An Analysis of Job Satisfaction for Special Educators Who Instruct Students with Emotional/Behavioral Disorders: How Working Conditions Impact Commitment.
Teachers of students with emotional/behavioral disorders (E/BD) find that myriad concerns for effective teaching (e.g., salaries, increased paperwork, classroom management) challenge their ability to meet personal and professional needs. The push for certified teachers and limited training to work with students with special needs create stressors that can prohibit effective teaching in the workplace. Teacher moral drops and half of newly hired employees leave the profession. Equally important, student outcomes are affected. Demographic information, program practices, and commitment information from special education teachers across the country were examined in this study. These areas of study helped to determine the best indicators for teacher job satisfaction and barriers that threaten satisfactory working conditions. An online survey was designed to capture 29 areas to explore qualifications and working environments for these teachers. Of the 600 targeted teachers, 332 individuals participated in Likert-like scales to determine their degree of satisfaction or dissatisfaction for working conditions, use of intervention strategies, and areas of commitment. Closed-ended and multiple-choice questions were used. Descriptive analyses and tables aided in understanding this study. The resulting factors indicated that, although some respondents pointed to job dissatisfaction within the subset of questions, participants who worked for more than 6 years …
Date:
August 2009
Creator:
Adkins, Beverly
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Global Economic Downturn and Protectionism
This report develops three scenarios to approximate different dimensions of the relationship between the global economic downturn and protectionism. The scenarios are not predictions, but descriptions of how and why pressures for protection could be manifested and transmitted under different circumstances and assumptions.
Date:
August 26, 2009
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Transatlantic Regulatory Cooperation: Background and Analysis
This report is intended to serve as an introduction and primer on a complicated, broad, and often highly technical set of issues.
Date:
August 24, 2009
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Transatlantic Regulatory Cooperation: A Possible Role for Congress
This report provides background and analysis on the TEC process, the role of the Congress, and the TLD.
Date:
August 25, 2009
Creator:
Ahearn, Raymond J. & Morelli, Vincent
Object Type:
Report
System:
The UNT Digital Library
Global Cooling: Policies to Cool the World and Offset Global Warming from CO2 Using Reflective Roofs and Pavements
Increasing the solar reflectance of the urban surface reduce its solar heat gain, lowers its temperatures, and decreases its outflow of thermal infrared radiation into the atmosphere. This process of 'negative radiative forcing' can help counter the effects of global warming. In addition, cool roofs reduce cooling-energy use in air conditioned buildings and increase comfort in unconditioned buildings; and cool roofs and cool pavements mitigate summer urban heat islands, improving outdoor air quality and comfort. Installing cool roofs and cool pavements in cities worldwide is a compelling win-win-win activity that can be undertaken immediately, outside of international negotiations to cap CO{sub 2} emissions. We propose an international campaign to use solar reflective materials when roofs and pavements are built or resurfaced in temperate and tropical regions.
Date:
August 28, 2009
Creator:
Akbari, Hashem; Levinson, Ronnen; Rosenfeld, Arthur & Elliot, Matthew
Object Type:
Article
System:
The UNT Digital Library
Subjectivity Word Sense Disambiguation
This paper investigates a new task, subjectivity word sense disambiguation (SWSD), which is to automatically determine which word instances in a corpus are being used with subjective senses, and which are being used with objective senses.
Date:
August 2009
Creator:
Akkaya, Cem; Wiebe, Janyce M. & Mihalcea, Rada, 1974-
Object Type:
Paper
System:
The UNT Digital Library
An investigation of factors affecting Omani faculty members' adoption of information and computing technology.
The purpose of this study was to explore the factors influencing information and computing technology (ICT) adoption for Omani faculty members from a framework of Rogers' theory of diffusion of innovation. Three hundred Omani faculty members from Sultan Qaboos University (SQU) participated in the study. The survey consisted of five parts: (a) an 18-item questionnaire on ICT uses and skills, (b) a 1-item questionnaire on adopter category, (c) a 44-item self-constructed questionnaire on perception of barriers to adopting ICT, (d) a 50-item questionnaire on ICT attributes adapted from Moore and Benbasat, and (e) a 15-item questionnaire on demographic and job-related variables. Descriptive statistics indicated that the faculty members overall used ICT at the "Sometimes" level and had ICT skills at the "Intermediate" level. The most frequently used and skillful ICT functional areas were Website browsing, Internet search engine, and word processing. One-way ANOVAs found significant group differences of ICT uses and skills, perception of barriers, and perception of ICT attributes in the category of adopter. Early adopters used ICT more, had higher ICT skills, perceived fewer barriers in the adopting process, and recognized higher values of ICT attributes than later adopters did. Multiple regression analysis showed the level of ICT …
Date:
August 2009
Creator:
Al Senaidi, Said
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Kinetic studies and computational modeling of atomic chlorine reactions in the gas phase.
The gas phase reactions of atomic chlorine with hydrogen sulfide, ammonia, benzene, and ethylene are investigated using the laser flash photolysis / resonance fluorescence experimental technique. In addition, the kinetics of the reverse processes for the latter two elementary reactions are also studied experimentally. The absolute rate constants for these processes are measured over a wide range of conditions, and the results offer new accurate information about the reactivity and thermochemistry of these systems. The temperature dependences of these reactions are interpreted via the Arrhenius equation, which yields significantly negative activation energies for the reaction of the chlorine atom and hydrogen sulfide as well as for that between the phenyl radical and hydrogen chloride. Positive activation energies which are smaller than the overall endothermicity are measured for the reactions between atomic chlorine with ammonia and ethylene, which suggests that the reverse processes for these reactions also possess negative activation energies. The enthalpies of formation of the phenyl and β-chlorovinyl are assessed via the third-law method. The stability and reactivity of each reaction system is further rationalized based on potential energy surfaces, computed with high-level ab initio quantum mechanical methods and refined through the inclusion of effects which arise from the …
Date:
August 2009
Creator:
Alecu, Ionut M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Winchester Warriors: Texas Rangers of Company D, 1874-1901
Access:
Use of this item is restricted to the UNT Community
The Texas Rangers were institutionally birthed in 1874 with the formation of the Frontier Battalion. They were tasked with interdicting Indian incursions into the frontier settlements and dealing with the lawlessness running rampant throughout Texas. In an effort to put a human face on the Rangers, Bob Alexander tells the story of one of the six companies of the Frontier Battalion, Company D. Readers follow the Rangers of Company D as—over time—it transforms from a unit of adventurous boys into a reasonably well-oiled law enforcement machine staffed by career-oriented lawmen. Beginning with their start as Indian fighters against the Comanches and Kiowas, Alexander explores the history of Company D as they rounded up numerous Texas outlaws and cattle thieves, engaged in border skirmishes along the Rio Grande, and participated in notable episodes such as the fence cutter wars. Winchester Warriors is an evenhanded and impartial assessment of Company D and its colorful cadre of Texas Rangers. Their laudable deeds are explored in detail, but by the same token their shameful misadventures are not whitewashed. These Texas Rangers were simply people, good and bad—and sometimes indifferent. This new study, extensively researched in both primary and secondary sources, will appeal to scholars …
Date:
August 15, 2009
Creator:
Alexander, Bob
Object Type:
Book
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 28, No. 31, Ed. 1 Thursday, August 6, 2009
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
August 6, 2009
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 28, No. 32, Ed. 1 Thursday, August 13, 2009
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
August 13, 2009
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 28, No. 33, Ed. 1 Thursday, August 20, 2009
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
August 20, 2009
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 28, No. 34, Ed. 1 Thursday, August 27, 2009
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
August 27, 2009
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Performance Analysis of Memory Transfers and GEMM Subroutines on NVIDIA Tesla GPU Cluster
Commodity clusters augmented with application accelerators are evolving as competitive high performance computing systems. The Graphical Processing Unit (GPU) with a very high arithmetic density and performance per price ratio is a good platform for the scientific application acceleration. In addition to the interconnect bottlenecks among the cluster compute nodes, the cost of memory copies between the host and the GPU device have to be carefully amortized to improve the overall efficiency of the application. Scientific applications also rely on efficient implementation of the BAsic Linear Algebra Subroutines (BLAS), among which the General Matrix Multiply (GEMM) is considered as the workhorse subroutine. In this paper, they study the performance of the memory copies and GEMM subroutines that are critical to port the computational chemistry algorithms to the GPU clusters. To that end, a benchmark based on the NetPIPE framework is developed to evaluate the latency and bandwidth of the memory copies between the host and the GPU device. The performance of the single and double precision GEMM subroutines from the NVIDIA CUBLAS 2.0 library are studied. The results have been compared with that of the BLAS routines from the Intel Math Kernel Library (MKL) to understand the computational trade-offs. The …
Date:
August 31, 2009
Creator:
Allada, Veerendra, Benjegerdes, Troy & Bode, Brett
Object Type:
Article
System:
The UNT Digital Library
THE SECOND STAGE OF FERMI@ELETTRA: A SEEDED FEL IN THE SOFT X-RAY SPECTRAL RANGE
The second stage of the FERMI FEL, named FEL-2, is based on the principle of high-gain harmonic generation and relies on a double-seeded cascade. Recent developments stimulated a revision of the original setup, which was designed to cover the spectral range between 40 and 10 nm. The numerical simulations we present here show that the nominal (expected) electron-beam performance allows extension of the FEL spectral range down to 4 nm. A significant amount of third harmonic power can be also expected. We also show that the proposed setup is flexible enough for exploiting future developments of new seed sources, e.g., high harmonic generation in gases.
Date:
August 14, 2009
Creator:
Allaria, E.; DeNinno, G. & Fawley, W. M.
Object Type:
Article
System:
The UNT Digital Library
Handling Pyrophoric Reagents
Pyrophoric reagents are extremely hazardous. Special handling techniques are required to prevent contact with air and the resulting fire. This document provides several methods for working with pyrophoric reagents outside of an inert atmosphere.
Date:
August 14, 2009
Creator:
Alnajjar, Mikhail S. & Haynie, Todd O.
Object Type:
Report
System:
The UNT Digital Library
Connecting Reionization to the Local Universe
We present results of combined N-body and three-dimensional reionization calculations to determine the relationship between reionization history and local environment in a volume 1 Gpc h{sup -1} across and a resolution of about 1 Mpc. We resolve the formation of about 2 x 10{sup 6} halos of mass greater than {approx} 10{sup 12} M{sub {circle_dot}} at z = 0, allowing us to determine the relationship between halo mass and reionization epoch for galaxies and clusters. For our fiducial reionization model, in which reionization begins at z {approx} 15 and ends by z {approx} 6, we find a strong bias for cluster-size halos to be in the regions which reionized first, at redshifts 10 < z < 15. Consequently, material in clusters was reionized within relatively small regions, on the order of a few Mpc, implying that all clusters in our calculation were reionized by their own progenitors. Milky Way mass halos were on average reionized later and by larger regions, with a distribution most similar to the global one, indicating that low mass halos are nearly uncorrelated with reionization when only their mass is taken as a prior. On average, we find that most halos with mass less than 10{sup …
Date:
August 3, 2009
Creator:
Alvarez, Marcelo A.; Busha, Michael; Abel, Tom; Wechsler, Risa H. & /KIPAC, Menlo Park
Object Type:
Article
System:
The UNT Digital Library
Accretion onto the first stellar mass black holes
The first stars, forming at redshifts z > 15 in minihalos with M {approx} 10{sup 5-6} M{sub {circle_dot}} may leave behind remnant black holes, which could conceivably have been the 'seeds' for the supermassive black holes observed at z {approx}< 7. We study remnant black hole growth through accretion, including for the first time the radiation emitted due to accretion, with adaptive mesh refinement cosmological radiation-hydrodynamical simulations. The effects of photo-ionization and heating dramatically affect the large-scale inflow, resulting in negligible mass growth. We compare cases with accretion luminosity included and neglected to show that accretion radiation drastically changes the environment within 100 pc of the black hole, increasing gas temperatures by an order of magnitude. Gas densities are reduced and further star formation in the same minihalo is prevented for the two hundred million years we followed. Without radiative feedback included most seed black holes do not gain mass as efficiently as has been hoped for in previous theories, implying that black hole remnants of Pop III stars in minihalos are not likely to be miniquasars. Most importantly, however, our calculations demonstrate that if these black holes are indeed accreting close to the Bondi-Hoyle rate with ten percent radiative …
Date:
August 5, 2009
Creator:
Alvarez, Marcelo A.; Wise, John H. & Abel, Tom
Object Type:
Article
System:
The UNT Digital Library
African-American Parents' Nutritional Habits: Implications for the Prevention of Early Childhood Obesity.
This research study addressed the nutritional beliefs and habits of African-American parents of children aged 3 to 6 years old. Both quantitative and qualitative data collection methods were employed. Quantitative data was collected via the Comprehensive Feeding Practices Questionnaire as well as a demographic questionnaire. Qualitative data was collected from oral interviews conducted by the researcher. Seventy-five parents or guardians participated in the study. Findings for the research questions revealed the participants' beliefs about nutrition directly correlated with food they provided for their children and most believed nutrition rather than genetics played a role in their child(ren)'s weight. Furthermore, parents from lower income families consumed more home cooked meals per week and those with higher incomes did not consume more fast food per week. Food intake restriction and control in feeding was similar among all participants, regardless of restriction and control in feeding was similar among all participants, regardless of education or income level. Suggestions for future research were included.
Date:
August 2009
Creator:
Anderson, Andraya D.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library