Partner
UNT Libraries Government Documents Department
10,962
UNT Libraries
1,993
Oklahoma Historical Society
1,223
UNT Libraries Special Collections
977
Sterling Municipal Library
309
National Museum of the Pacific War/Admiral Nimitz Foundation
259
San Antonio Public Library
111
Carl Albert Congressional Research and Studies Center
94
Livingston Municipal Library
89
Patrick Heath Public Library
89
106 More
Collection
Office of Scientific & Technical Information Technical Reports
5,471
Texas Digital Newspaper Program
2,880
Defense Base Closure and Realignment Commission
2,501
Congressional Research Service Reports
1,931
Oklahoma Digital Newspaper Program
1,368
Tocker Foundation Grant
1,350
UNT Theses and Dissertations
1,076
Government Accountability Office Reports
498
The Greensheet
390
KXAS-NBC 5 News Collection
325
187 More
Degree Department
Department of Psychology
162
College of Music
130
Department of Biological Sciences
69
Department of Counseling, Development and Higher Education
67
Department of English
61
Department of Teacher Education and Administration
43
Department of Behavior Analysis
36
Department of History
36
Department of Chemistry
35
Department of Criminal Justice
33
69 More
Degree Discipline
Degree Level
Country
States
Decade
Year
Month
Language
18,306 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
18,306
next
1-D Equilibrium Discrete Diffusion Monte Carlo
We present a new hybrid Monte Carlo method for 1-D equilibrium diffusion problems in which the radiation field coexists with matter in local thermodynamic equilibrium. This method, the Equilibrium Discrete Diffusion Monte Carlo (EqDDMC) method, combines Monte Carlo particles with spatially discrete diffusion solutions. We verify the EqDDMC method with computational results from three slab problems. The EqDDMC method represents an incremental step toward applying this hybrid methodology to non-equilibrium diffusion, where it could be simultaneously coupled to Monte Carlo transport.
Date:
August 2000
Creator:
Evans, T. M.; Urbatsch, T. J. & Lichtenstein, H.
Object Type:
Article
System:
The UNT Digital Library
1999 Gordon Research Conference on Atmospheric Chemistry
The Gordon Research Conference (GRC) on Atmospheric Chemistry was held at Salve Regina University in Newport, Rhode Island, June 13-18, 1999. The conference was well attended with 151 participants. The attendees represented the spectrum of endeavor in this field coming from academia, industry, and government laboratories, both US and foreign scientists, senior researchers, young investigators, and students.
Date:
August 1, 2000
Creator:
Storm, C.
Object Type:
Article
System:
The UNT Digital Library
Adherence and Haemagglutination of Moraxella Catarrhalis.
Access:
Use of this item is restricted to the UNT Community
M. catarrhalis is a gram-negative diplococci frequently associated with infections of the upper respiratory tract. During the past decade, some preliminary studies have attempted to elucidate mechanisms of adherence and haemagglutination of M. catarrhalis. These studies have reported, in many cases, inconsistent results. There are two purposes of this research. First, identify mechanisms that may potentially be associated with the adherence and haemagglutination of M. catarrhalis. Second, suggest research directions that may be fruitful in clarifying these mechanisms.
Date:
August 2000
Creator:
Kosterman, Edward, III
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Adolescent Stress Response to a Naturalistic Driving Stressor
The proposed study examined the role of anxiety and risk-taking in driving performance in adolescents. In addition to examining the sample as a whole, gender differences were assessed given earlier reports from our laboratory and others indicating that males and females differ with respect to risky behaviors to driving performance and anxiety. Adolescents' subjective and physiological responses to a driving simulator task were assessed. Anxiety was measured via self report and salivary cortisol. Participants provided a baseline saliva sample and 3 post-task samples for cortisol analysis. Subjective anxiety scores were obtained at both baseline and following the driving stressor. Information concerning impulsivity, as well as other psychological constructs was also collected at baseline. Unlike the pilot study, there were no relationships (with or without respect to gender) between salivary cortisol and both self-reported anxiety (state and trait) or impulsively measures for this sample. These results suggest that this group of adolescents may not have been anxious about the driving task. This discrepancy may stem from error introduced by the smaller sample size obtained from the initial findings or to other factors remaining outside the parameters of the current study. The task did, however, induce a slight hypothalamic pituitary adrenal (HPA) …
Date:
August 2000
Creator:
Wingo, Mary
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Age, Volume 23, Number 8, August 2000
Monthly publication containing information related to Chambers County, Texas, including current events of the Chambers County Historical Commission, the Wallisville Heritage Park, and the Chambers County historical and genealogical societies; reprinted newspaper articles about county events and citizens; and historical news and records.
Date:
August 2000
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
AIR DISPERSION MODELING AT THE WASTE ISOLATION PILOT PLANT
One concern at the Waste Isolation Pilot Plant (WIPP) is the amount of alpha-emitting radionuclides or hazardous chemicals that can become airborne at the facility and reach the Exclusive Use Area boundary as the result of a release from the Waste Handling Building (WHB) or from the underground during waste emplacement operations. The WIPP Safety Analysis Report (SAR), WIPP RCRA Permit, and WIPP Emergency Preparedness Hazards Assessments include air dispersion calculations to address this issue. Meteorological conditions at the WIPP facility will dictate direction, speed, and dilution of a contaminant plume of respirable material due to chronic releases or during an accident. Due to the paucity of meteorological information at the WIPP site prior to September 1996, the Department of Energy (DOE) reports had to rely largely on unqualified climatic data from the site and neighboring Carlsbad, which is situated approximately 40 km (26 miles) to the west of the site. This report examines the validity of the DOE air dispersion calculations using new meteorological data measured and collected at the WIPP site since September 1996. The air dispersion calculations in this report include both chronic and acute releases. Chronic release calculations were conducted with the EPA-approved code, CAP88PC and …
Date:
August 1, 2000
Creator:
Rucker, D. F.
Object Type:
Report
System:
The UNT Digital Library
Algorithmic Strategies in Combinatorial Chemistry
Combinatorial Chemistry is a powerful new technology in drug design and molecular recognition. It is a wet-laboratory methodology aimed at ``massively parallel'' screening of chemical compounds for the discovery of compounds that have a certain biological activity. The power of the method comes from the interaction between experimental design and computational modeling. Principles of ``rational'' drug design are used in the construction of combinatorial libraries to speed up the discovery of lead compounds with the desired biological activity. This paper presents algorithms, software development and computational complexity analysis for problems arising in the design of combinatorial libraries for drug discovery. The authors provide exact polynomial time algorithms and intractability results for several Inverse Problems-formulated as (chemical) graph reconstruction problems-related to the design of combinatorial libraries. These are the first rigorous algorithmic results in the literature. The authors also present results provided by the combinatorial chemistry software package OCOTILLO for combinatorial peptide design using real data libraries. The package provides exact solutions for general inverse problems based on shortest-path topological indices. The results are superior both in accuracy and computing time to the best software reports published in the literature. For 5-peptoid design, the computation is rigorously reduced to an exhaustive …
Date:
August 1, 2000
Creator:
Goldman, Deborah; Istrail, Sorin; Lancia, Giuseppe; Piccolboni, Antonio & Walenz, Brian
Object Type:
Article
System:
The UNT Digital Library
Algorithms for Efficient Utilization of Wireless Bandwidth and to Provide Quality-of-Service in Wireless Networks
This thesis presents algorithms to utilize the wireless bandwidth efficiently and at the same time meet the quality of service (QoS) requirements of the users. In the proposed algorithms we present an adaptive frame structure based upon the airlink frame loss probability and control the admission of call requests into the system based upon the load on the system and the QoS requirements of the incoming call requests. The performance of the proposed algorithms is studied by developing analytical formulations and simulation experiments. Finally we present an admission control algorithm which uses an adaptive delay computation algorithm to compute the queuing delay for each class of traffic and adapts the service rate and the reliability in the estimates based upon the deviation in the expected and obtained performance. We study the performance of the call admission control algorithm by simulation experiments. Simulation results for the adaptive frame structure algorithm show an improvement in the number of users in the system but there is a drop in the system throughput. In spite of the lower throughput the adaptive frame structure algorithm has fewer QoS delay violations. The adaptive call admission control algorithm adapts the call dropping probability of different classes of …
Date:
August 2000
Creator:
Kakani, Naveen Kumar
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 101, No. 122, Ed. 1 Tuesday, August 1, 2000
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 1, 2000
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Aluminum-Free P-n-P InGaAsN Double Heterojunction Bipolar Transistors
The authors have demonstrated an aluminum-free P-n-P GaAs/InGaAsN/GaAs double heterojunction bipolar transistor (DHBT). The device has a low turn-on voltage (V{sub ON}) that is 0.27 V lower than in a comparable P-n-p AlGaAs/GaAs HBT. The device shows near-ideal D. C. characteristics with a current gain ({beta}) greater than 45. The high-speed performance of the device are comparable to a similar P-n-p AlGaAs/GaAs HBT, with f{sub T} and f{sub MAX} values of 12 GHz and 10 GHz, respectively. This device is very suitable for low-power complementary HBT circuit applications, while the aluminum-free emitter structure eliminates issues typically associated with AlGaAs.
Date:
August 1, 2000
Creator:
Chang, Ping-Chih; Li, N. Y.; Baca, Albert G.; Monier, C.; Laroche, J. R.; Hou, H. Q. et al.
Object Type:
Article
System:
The UNT Digital Library
Americium Separations From Nitric Acid Process Effluent Streams
The aging of the US nuclear stockpile presents a number of challenges, including the ever-increasing radioactivity of plutonium residues from {sup 241}Am. Minimization of this weak gamma-emitter in process and waste solutions is desirable to reduce both worker exposure and the effects of radiolysis on the final waste product. Removal of americium from plutonium nitric acid processing effluents, however, is complicated by the presence of large.quantities of competing metals, particularly Fe and Al, and-strongly oxidizing acidic solutions. The reprocessing operation offers several points at which americium removal maybe attempted, and we are evaluating two classes of materials targeted at different steps in the process. Extraction chromatography resin materials loaded with three different alkylcarbamoyl phosphinates and phosphine oxides were accessed for Am removal efficiency and Am/Fe selectivity from 1-7 molar nitric acid solutions. Commercial and experimental mono- and bifunctional anion-exchange resins were evaluated for total alpha-activity removal from post-evaporator solutions whose composition, relative to the original nitric acid effluent, is reduced in acid and greatly increased in total salt content. With both classes of materials, americium/total alpha emission removal is sufficient to meet regulatory requirements even under sub-optimal conditions. Batch distribution coefficients, column performance data, and the effects of Fe-masking agents …
Date:
August 1, 2000
Creator:
Barr, M. & Jarvinen, G.
Object Type:
Article
System:
The UNT Digital Library
Analysis and databasing software for integrated tomographic gamma scanner (TGS) and passive-active neutron (PAN) assay systems
None
Date:
August 1, 2000
Creator:
Estep, R.; Melton, S. & Buenafe, C.
Object Type:
Article
System:
The UNT Digital Library
Analysis of Fragmentation and Resulting Shrapnel Penetration of Naturally Fragmenting Cylindrical Bombs
Fragmentation of exploding cylinders and penetration mechanics of surrounding vessel walls were examined and a qualitative understanding was achieved. This understanding provided a basis for making simplifying approximations and assumptions that aided in creating a shrapnel penetration model. Several mathematical models were discussed, and results from 6 cylinder tests were analyzed in order to select a model that best represented the data. It was determined that the overall best mathematical model to predict shrapnel penetration uses the modified Gurney equation to calculate fragment velocity, the Mott equation to calculate largest fragment weight, and the Christman/Gehring equation to calculate penetration depth.
Date:
August 1, 2000
Creator:
Gardner, S. E.
Object Type:
Report
System:
The UNT Digital Library
Analysis of longitudinal bunching in an FEL driven two-beam accelerator
Recent experiments have explored the use of a free-electron laser (FEL) as a buncher for a microwave two-beam accelerator, and the subsequent driving of a standing-wave rf output cavity. Here the authors present a deeper analysis of the longitudinal dynamics of the electron bunches as they are transported from the end of the FEL and through the output cavity. In particular, the authors examine the effect of the transport region and cavity aperture to filter the bunched portion of the beam.
Date:
August 1, 2000
Creator:
Lidia, S.; Gardelle, J.; Lefevre, T.; Donohue, J.T.; Gouard, P.; Rullier, J.L. et al.
Object Type:
Article
System:
The UNT Digital Library
An Analysis of the Impact of Sport Utility Vehicles in the United States
It may be labeled sport utility vehicle, SUV, sport-ute, suburban assault vehicle, or a friend of OPEC (Organization for Petroleum Exporting Countries). It has been the subject of comics, the object of high-finance marketing ploys, and the theme of Dateline. Whatever the label or the occasion, this vehicle is in great demand. The popularity of sport utility vehicles (SUVs) has increased dramatically since the late 1970s, and SUVs are currently the fastest growing segment of the motor vehicle industry. Hoping to gain market share due to the popularity of the expanding SUV market, more and more manufacturers are adding SUVs to their vehicle lineup. One purpose of this study is to analyze the world of the SUV to determine why this vehicle has seen such a rapid increase in popularity. Another purpose is to examine the impact of SUVs on energy consumption, emissions, and highway safety.
Date:
August 1, 2000
Creator:
Davis, S. C. & Truett, L. F.
Object Type:
Report
System:
The UNT Digital Library
Anomalous diffusion associated with nonlinear fractional derivative Fokker-Planck-like equation: Exact time-dependent solutions
Article discussing research on anomalous diffusion associated with nonlinear fractional derivative Fokker-Planck-like equation.
Date:
August 2000
Creator:
Bologna, Mauro; Tsallis, Constantino & Grigolini, Paolo
Object Type:
Article
System:
The UNT Digital Library
The Application of a Health Service Utilization Model to a Low Income, Ethnically Diverse Sample of Women
Access:
Use of this item is restricted to the UNT Community
A model for health care utilization was applied to a sample of low income women. Demographic Predisposing, Psychosocial Predisposing, Illness Level, and Enabling indicators were examined separately for African American (n = 266), Anglo American (n = 200), and Mexican American (n = 210) women. Structural Equation Modeling revealed that for African American and Anglo American women, Illness Level, the only significant path to Utilization, had a mediating effect on Psychosocial Predisposing indicators. The model for Mexican Americans was the most complex with Enabling indicators affecting Illness Level and Utilization. Psychosocial Predisposing indicators were mediated by Illness Level and Enabling indicators which both directly affected Utilization. Implications of the results for future research are addressed.
Date:
August 2000
Creator:
Keenan, Lisa A.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Application of the SmartSampling Methodology to the Evaluation of Contaminated Landscape Soils at Brookhaven National Laboratory
Portions of the SmartSampling{trademark} analysis methodology have been applied to the evaluation of radioactive contaminated landscape soils at Brookhaven National Laboratory. Specifically, the spatial, volumetric distribution of cesium-137 ({sup 137}Cs) contamination within Area of Concern 16E-1 has been modeled probabilistically using a geostatistical methodology, with the purpose of identifying the likelihood of successfully reducing, with respect to a pre-existing, baseline remediation plan, the volume of soil that must be disposed of offsite during clean-up. The principal objective of the analysis was to evaluate the likelihood of successful deployment of the Segmented Gate System (SGS), a novel remediation approach that emphasizes real-time separation of clean from contaminated materials during remediation operations. One primary requirement for successful application of the segmented gate technology investigated is that a variety of contaminant levels exist at the deployment site, which would enable to the SGS to discriminate material above and below a specified remediation threshold value. The results of this analysis indicate that there is potential for significant volume reduction with respect to the baseline remediation plan at a threshold excavation level of 23 pCi/g {sup 137}Cs. A reduction of approximately 50%, from a baseline volume of approximately 1,064.7 yd{sup 3} to less than 550 …
Date:
August 1, 2000
Creator:
RAUTMAN,CHRISTOPHER A.
Object Type:
Report
System:
The UNT Digital Library
Ash Deposit Formation and Deposit Properties. A Comprehensive Summary of Research Conducted at Sandia's Combustion Research Facility
This report summarizes experimental and theoretical work performed at Sandia's Combustion Research Facility over the past eight years on the fate of inorganic material during coal combustion. This work has been done under four broad categories: coal characterization, fly ash formation, ash deposition, and deposit property development. The objective was to provide sufficient understanding of these four areas to be able to predict coal behavior in current and advanced conversion systems. This work has led to new characterization techniques for fuels that provide, for the first time, systematic and species specific information regarding the inorganic material. The transformations of inorganic material during combustion can be described in terms of the net effects of the transformations of these individual species. Deposit formation mechanisms provide a framework for predicting deposition rates for abroad range of particle sizes. Predictions based on these rates many times are quite accurate although there are important exceptions. A rigorous framework for evaluating deposit has been established. Substantial data have been obtained with which to exercise this framework, but this portion of the work is less mature than is any other. Accurate prediction of deposit properties as functions of fuel properties, boiler design, and boiler operating conditions represents …
Date:
August 1, 2000
Creator:
Baxter, Larry L.
Object Type:
Report
System:
The UNT Digital Library
Assessing Housing Markets for Seniors
A short report on housing market research and needs for seniors.
Date:
August 2000
Creator:
Cowley, Jennifer S. & Witherspoon, John R.
Object Type:
Report
System:
The Portal to Texas History
Assessing the Spatial and Temporal Distribution of MTBE and BTEX Compounds in Lake Lewisville, Texas February 1999 - February 2000
The spatial and temporal distribution of Methyl Tertiary-Butyl Ether (MTBE) and BTEX (Benzene, Toluene, Ethylbenzene, Xylenes) compounds were assessed in a multipurpose reservoir, Lake Lewisville, Texas between February 1999 and February 2000. Concentrations of MTBE ranged from 0.0 - 16.7 mg/L. Levels of MTBE in the lake were related to watercraft. BTEX concentrations were never detected above 2.0 mg/L during the sampling period. Finished drinking water from Denton and the Upper Trinity Regional Water District (UTRWD) Treatment Plants were also tested for MTBE and BTEX. MTBE and BTEX were not detected in UTRWD water samples. Denton's finished water samples never exceeded 2.2 mg/L for MTBE and BTEX was not detected except for one replicate of 1.1 mg/L toluene.
Date:
August 2000
Creator:
Lee, Anne W.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Assisted Living: The Need for Creation of Affordable Options
Access:
Use of this item is restricted to the UNT Community
Assisted living, the fastest growing segment of the senior housing industry, allows individuals to remain as independent as they prefer and still receive necessary services. However, assisted living residences exist primarily to serve those seniors who can pay for the services from their own savings/income. We are facing a critical need for housing options for both the current senior generation and the soon-to-be-retired baby boomers. How will access to assisted living be opened to all types of payors? How will states fund the growth of assisted living? The purpose of this paper is to discuss opportunities for expansion that will make assisted living an affordable option for the low- and moderate-income elderly.
Date:
August 2000
Creator:
Kretzinger, Robert W.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Association of ventilation with health and other responses in commercial and institutional buildings
The paper presents a summary of a review [1] of current literature on the associations of ventilation rates in non-residential and non-industrial buildings (primarily offices) with health and other human outcomes. Twenty studies, with close to 30,000 subjects, investigated the association of ventilation rates with human responses. (Twenty one studies investigating the association of carbon dioxide with human responses, although included in the previous review, are not summarized here.) Almost all studies including ventilation rates below 10 Ls{sup -1} per person found these ventilation rates to be associated in all building types with statistically significant worsening in one or more health or perceived air quality outcomes. Some studies comparing only ventilation rates above 10 Ls{sup -1} per person determined that increases in ventilation rate above 10 Ls{sup -1} per person, up to approximately 20 Ls{sup -1} per person, were associated with further significant decreases in the prevalence of SBS symptoms or with further significant improvements in perceived air quality. The studies reported relative risks of 1.5-2 for respiratory illnesses and 1.1-6 for sick building syndrome symptoms for low compared to high ventilation rates.
Date:
August 1, 2000
Creator:
Seppanen, Olli; Fisk, William J. & Mendell, Mark J.
Object Type:
Article
System:
The UNT Digital Library
Athletes' Attitudes Toward Seeking Sport Psychology Consultation: Development and Validation of the Sport Psychology Attitudes Questionnaire
The purpose of the study was to create a questionnaire to identify underlying dimensions of athletes' attitudes toward seeking sport psychology consultation. A total of 1138 athletes (625 males, 513 females) representing 36 sports from four levels of participation were used to develop the Sport Psychology Attitudes Questionnaire (SPAQ). In Study I, exploratory factor analysis produced a two-factor solution that accounted for 37.1% of the overall variance: (a) belief in the credibility of sport psychology (14 items) and (b) preference for similarity with a sport psychology consultant (SPC) (7 items). Three items were omitted following item analysis, and nine items were eliminated after failing to load higher than the cut-off value of .40 on either of the factors. In Study II, confirmatory factor analysis supported the two-factor model, and multigroup comparison in Study III demonstrated that the model fit well for both male and female samples. As for validity, the SPAQ factors predictably (a) distinguished between athletes with and without previous experience with a SPC, (b) related to ratings of helpfulness/satisfaction related to a previous experience with a SPC, and (c) correlated with willingness to see a SPC for help in the future. Also, the SPAQ factors were related, as …
Date:
August 2000
Creator:
Harmison, Robert J.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library