Partner
UNT Libraries Government Documents Department
1,781
UNT Libraries Special Collections
169
UNT Libraries
60
Oklahoma Historical Society
46
National Museum of the Pacific War/Admiral Nimitz Foundation
18
Oklahoma State Firefighters Museum
10
Sterling Municipal Library
10
Carl Albert Congressional Research and Studies Center
7
San Antonio Public Library
5
Abilene Christian University Library
3
68 More
Collection
Office of Scientific & Technical Information Technical Reports
1,639
Texas Digital Newspaper Program
138
President Gretchen Bataille Records
92
Government Accountability Office Reports
73
Oklahoma Digital Newspaper Program
66
Tocker Foundation Grant
53
Congressional Research Service Reports
51
Photographing Texas
39
University Photography Collection
34
Photographing UNT
34
120 More
Country
States
Decade
Month
Day
Language
2,226 Matching Results
Results open in a new window/tab.
Mechanisms of Atmospheric Copper Sulfidation and Evaluation of Parallel Experimentation Techniques
A physics-based understanding of material aging mechanisms helps to increase reliability when predicting the lifetime of mechanical and electrical components. This report examines in detail the mechanisms of atmospheric copper sulfidation and evaluates new methods of parallel experimentation for high-throughput corrosion analysis. Often our knowledge of aging mechanisms is limited because coupled chemical reactions and physical processes are involved that depend on complex interactions with the environment and component functionality. Atmospheric corrosion is one of the most complex aging phenomena and it has profound consequences for the nation's economy and safety. Therefore, copper sulfidation was used as a test-case to examine the utility of parallel experimentation. Through the use of parallel and conventional experimentation, we measured: (1) the sulfidation rate as a function of humidity, light, temperature and O{sub 2} concentration; (2) the primary moving species in solid state transport; (3) the diffusivity of Cu vacancies through Cu{sub 2}S; (4) the sulfidation activation energies as a function of relative humidity (RH); (5) the sulfidation induction times at low humidities; and (6) the effect of light on the sulfidation rate. Also, the importance of various sulfidation mechanisms was determined as a function of RH and sulfide thickness. Different models for sulfidation-reactor …
Date:
March 1, 2002
Creator:
BARBOUR, J. CHARLES; SULLIVAN, JOHN P.; CAMPIN, MICHAEL J.; WRIGHT, ALAN F.; MISSERT, NANCY A.; BRAITHWAITE, JEFFREY W. et al.
Object Type:
Report
System:
The UNT Digital Library
Active Control of Magnetically Levitated Bearings
This report summarizes experimental and test results from a two year LDRD project entitled Real Time Error Correction Using Electromagnetic Bearing Spindles. This project was designed to explore various control schemes for levitating magnetic bearings with the goal of obtaining high precision location of the spindle and exceptionally high rotational speeds. As part of this work, several adaptive control schemes were devised, analyzed, and implemented on an experimental magnetic bearing system. Measured results, which indicated precision positional control of the spindle was possible, agreed reasonably well with simulations. Testing also indicated that the magnetic bearing systems were capable of very high rotational speeds but were still not immune to traditional structural dynamic limitations caused by spindle flexibility effects.
Date:
March 1, 2001
Creator:
BARNEY, PATRICK S.; LAUFFER, JAMES P.; REDMOND, JAMES M. & SULLIVAN, WILLIAM N.
Object Type:
Report
System:
The UNT Digital Library
Key Management for SCADA
None
Date:
March 1, 2002
Creator:
BEAVER, CHERYL L.; GALLUP, DONALD R.; NEUMANN, WILLIAM D. & TORGERSON, MARK D.
Object Type:
Report
System:
The UNT Digital Library
HVL{_}CTH: A Simple Tool That Simulates The Hyper-Velocity Launch of a Flyer Plate
Sandia National Laboratories has developed a unique method for a hyper-velocity launch (HVL), the three-stage gun. The three-stage gun is a modified two-stage light-gas gun, consisting of a piston used in the first stage, an impactor in the second stage, and a flyer plate in the third stage. The impactor is made up of different material layers that are increasing in shock impedance. The graded or pillowed layers allow the flyer to be launched at velocities up to 16 km/s without the formation of a single shock wave in the flyer plate and without it melting. Under certain experimental conditions the flyer velocity cannot be measured by standard means, X-rays and VISAR. Also, there is a need to know the flyer velocity prior to a launch in order to calibrate instruments and determine the appropriate shot configuration. The objective of HVL{_}CTH is to produce an accurate forecast of the flyer plate velocity under different launch conditions. CTH is a Eulerian shock physics computational analysis package developed at Sandia National Laboratories. Using CTH requires knowledge of its syntax and capabilities. HVL{_}CTH allows the user to easily interface with CTH, through the use of Fortran programs and batch files, in order to …
Date:
March 1, 2003
Creator:
BLACKBURN, DANIEL R.; VOGLER, TRACY J. & CHHABILDAS, LALIT C.
Object Type:
Report
System:
The UNT Digital Library
Low-Level Detection of a Bacillus Anthracis Simulant using Love-Wave Biosensors on 36 Degree YX LiTaO3
Crucial to low-level detection of biowarfare agents in aqueous environments is the mass sensitivity optimization of Love-wave acoustic sensors. The present work is an experimental study of 36{sup o} YX cut LiTaO{sub 3} based Love-wave devices for detection of pathogenic spores in aqueous conditions. Given that the detection limit (DL) of Love-wave based sensors is a strong function of the overlying waveguide, two waveguide materials have been investigated, which are polyimide and polystyrene. To determine the mass sensitivity of Love-wave sensor, bovine serum albumin (BSA) protein was injected into the Love-wave test cell while recording magnitude and phase shift across each sensor. Polyimide had the lowest mass detection limit with an estimated value of 1-2 ng/cm{sup 2}, as compared to polystyrene where DL = 2.0 ng/cm{sup 2}. Suitable chemistries were used to orient antibodies on the Love-wave sensor using adsorbed protein G. The thickness of each biofilm was measured using ellipsometry from which the surface concentrations were calculated. The monoclonal antibody BD8 with a high degree of selectivity for anthrax spores was used to capture the non-pathogenic simulant B. thuringiensis B8 spores. Bacillus Subtilis spores were used as a negative control to determine whether significant non-specific binding would occur. Spore …
Date:
March 1, 2003
Creator:
BRANCH,DARREN W. & BROZIK,SUSAN M.
Object Type:
Report
System:
The UNT Digital Library
EVOLVING FOREST FIRE BURN SEVERITY CLASSIFICATION ALGORITHMS FOR MULTI-SPECTRAL IMAGERY
None
Date:
March 1, 2001
Creator:
BRUMBY, S. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
Alaska North Slope Tundra Travel Model and Validation Study
The Alaska Department of Natural Resources (DNR), Division of Mining, Land, and Water manages cross-country travel, typically associated with hydrocarbon exploration and development, on Alaska's arctic North Slope. This project is intended to provide natural resource managers with objective, quantitative data to assist decision making regarding opening of the tundra to cross-country travel. DNR designed standardized, controlled field trials, with baseline data, to investigate the relationships present between winter exploration vehicle treatments and the independent variables of ground hardness, snow depth, and snow slab thickness, as they relate to the dependent variables of active layer depth, soil moisture, and photosynthetically active radiation (a proxy for plant disturbance). Changes in the dependent variables were used as indicators of tundra disturbance. Two main tundra community types were studied: Coastal Plain (wet graminoid/moist sedge shrub) and Foothills (tussock). DNR constructed four models to address physical soil properties: two models for each main community type, one predicting change in depth of active layer and a second predicting change in soil moisture. DNR also investigated the limited potential management utility in using soil temperature, the amount of photosynthetically active radiation (PAR) absorbed by plants, and changes in microphotography as tools for the identification of disturbance …
Date:
March 1, 2006
Creator:
Bader, Harry R. & Guimond, Jacynthe
Object Type:
Report
System:
The UNT Digital Library
An engineering-economic analysis of combined heat and power technologies in a (mu)grid application
This report describes an investigation at Ernesto Orlando Lawrence Berkeley National Laboratory (Berkeley Lab) of the potential for coupling combined heat and power (CHP) with on-site electricity generation to provide power and heating, and cooling services to customers. This research into distributed energy resources (DER) builds on the concept of the microgrid (mGrid), a semiautonomous grouping of power-generating sources that are placed and operated by and for the benefit of its members. For this investigation, a hypothetical small shopping mall (''Microgrid Oaks'') was developed and analyzed for the cost effectiveness of installing CHP to provide the mGrid's energy needs. A mGrid consists of groups of customers pooling energy loads and installing a combination of generation resources that meets the particular mGrid's goals. This study assumes the mGrid is seeking to minimize energy costs. mGrids could operate independently of the macrogrid (the wider power network), but they are usually assumed to be connected, through power electronics, to the macrogrid. The mGrid in this study is assumed to be interconnected to the macrogrid, and can purchase some energy and ancillary services from utility providers.
Date:
March 1, 2002
Creator:
Bailey, Owen; Ouaglal, Boubekeur; Bartholomew, Emily; Marnay, Chris & Bourassa, Norman
Object Type:
Report
System:
The UNT Digital Library
Oklahoma Firefighter (Oklahoma City, Okla.), Vol. 23, No. 2, Ed. 1 Wednesday, March 1, 2006
Monthly periodical from Oklahoma City, Oklahoma published by and for members of the Oklahoma State Firefighters Association that includes news and information along with advertising.
Date:
March 1, 2006
Creator:
Bain, Chris
Object Type:
Journal/Magazine/Newsletter
System:
The Gateway to Oklahoma History
Oklahoma Firefighter (Oklahoma City, Okla.), Vol. 24, No. 2, Ed. 1 Thursday, March 1, 2007
Monthly periodical from Oklahoma City, Oklahoma published by and for members of the Oklahoma State Firefighters Association that includes news and information along with advertising.
Date:
March 1, 2007
Creator:
Bain, Chris
Object Type:
Journal/Magazine/Newsletter
System:
The Gateway to Oklahoma History
Oklahoma Firefighter (Oklahoma City, Okla.), Vol. 25, No. 2, Ed. 1 Saturday, March 1, 2008
Monthly periodical from Oklahoma City, Oklahoma published by and for members of the Oklahoma State Firefighters Association that includes news and information along with advertising.
Date:
March 1, 2008
Creator:
Bain, Chris
Object Type:
Journal/Magazine/Newsletter
System:
The Gateway to Oklahoma History
Oklahoma Firefighter (Oklahoma City, Okla.), Vol. 26, No. 2, Ed. 1 Sunday, March 1, 2009
Monthly periodical from Oklahoma City, Oklahoma published by and for members of the Oklahoma State Firefighters Association that includes news and information along with advertising.
Date:
March 1, 2009
Creator:
Bain, Chris
Object Type:
Journal/Magazine/Newsletter
System:
The Gateway to Oklahoma History
Proposal to upgrade the MIPP data acquisition system
The MIPP TPC is the largest contributor to the MIPP event size by far. Its readout system and electronics were designed in the 1990's and limit it to a readout rate of 60 Hz in simple events and {approx} 20 Hz in complicated events. With the readout chips designed for the ALICE collaboration at the LHC, we propose a low cost effective scheme of upgrading the MIPP data acquisition speed to 3000 Hz.
Date:
March 1, 2005
Creator:
Baker, W.; Carey, D.; Johnstone, C.; Kostin, M.; Meyer, H. & Raja, R.
Object Type:
Report
System:
The UNT Digital Library
Risk Reduction With a Fuzzy Expert Exploration Tool
Incomplete or sparse data such as geologic or formation characteristics introduce a high level of risk for oil exploration and development projects. ''Expert'' systems developed and used in several disciplines and industries have demonstrated beneficial results when working with sparse data. State-of-the-art expert exploration tools, relying on a database, and computer maps generated by neural networks and user inputs, have been developed through the use of ''fuzzy'' logic, a mathematical treatment of imprecise or non-explicit parameters and values. Oil prospecting risk has been reduced with the use of these properly verified and validated ''Fuzzy Expert Exploration (FEE) Tools.'' Through the course of this project, FEE Tools and supporting software were developed for two producing formations in southeast New Mexico. Tools of this type can be beneficial in many regions of the U.S. by enabling risk reduction in oil and gas prospecting as well as decreased prospecting and development costs. In today's oil industry environment, many smaller exploration companies lack the resources of a pool of expert exploration personnel. Downsizing, volatile oil prices, and scarcity of domestic exploration funds have also affected larger companies, and will, with time, affect the end users of oil industry products in the U.S. as reserves …
Date:
March 1, 2005
Creator:
Balch, Robert S. & Broadhead, Ron
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 31, No. 19, Ed. 1 Friday, March 1, 2002
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
March 1, 2002
Creator:
Baldwin, Alisha
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Lake Roosevelt Fisheries Evaluation Program; Evaluation of Limiting Factors for Stocked Kokanee and Rainbow Trout in Lake Roosevelt, Washington, 1999 Annual Report.
Hatchery supplementation of kokanee Oncorhynchus nerka and rainbow trout O. mykiss has been the primary mitigation provided by Bonneville Power Administration for loss of anadromous fish to the waters above Grand Coulee Dam (GCD). The hatchery program for rainbow trout has consistently met management goals and provided a substantial contribution to the fishery; however, spawner returns and creel survey results for kokanee have been below management goals. Our objective was to identify factors that limit limnetic fish production in Lake Roosevelt by evaluating abiotic conditions, food limitations, piscivory, and entrainment. Dissolved oxygen concentration was adequate throughout most of the year; however, levels dropped to near 6 mg/L in late July. For kokanee, warm water temperatures during mid-late summer limited their nocturnal distribution to 80-100 m in the lower section of the reservoir. Kokanee spawner length was consistently several centimeters longer than in other Pacific Northwest systems, and the relative weights of rainbow trout and large kokanee were comparable to national averages. Large bodied daphnia (> 1.7 mm) were present in the zooplankton community during all seasons indicating that top down effects were not limiting secondary productivity. Walleye Stizostedion vitreum were the primary piscivore of salmonids in 1998 and 1999. Burbot …
Date:
March 1, 2009
Creator:
Baldwin, Casey & Polacek, Matt
Object Type:
Report
System:
The UNT Digital Library
Next Generation Nuclear Plant Phenomena Identification and Ranking Tables (PIRTs) Volume 1: Main Report
A phenomena identification and ranking table (PIRT) process was conducted for the Next Generation Nuclear Plant (NGNP) design. This design (in the conceptual stage) is a modular high-temperature gas-cooled reactor (HTGR) that generates both electricity and process heat for hydrogen production. Expert panels identified safety-relevant phenomena, ranked their importance, and assessed the knowledge levels in the areas of accidents and thermal fluids, fission-product transport and dose, high-temperature materials, graphite, and process heat for hydrogen production. This main report summarizes and documents the process and scope of the reviews, noting the major activities and conclusions. The identified phenomena, analyses, rationales, and associated ratings of the phenomena, plus a summary of each panel's findings, are presented. Individual panel reports for these areas are provided as attached volumes to this main report and provide considerably more detail about each panel's deliberations as well as a more complete listing of the phenomena that were evaluated.
Date:
March 1, 2008
Creator:
Ball, Sydney J
Object Type:
Report
System:
The UNT Digital Library
Next Generation Nuclear Plant Phenomena Identification and Ranking Tables (PIRTs) Volume 2: Accident and Thermal Fluids Analysis PIRTs
An accident, thermal fluids, and reactor physics phenomena identification and ranking process was conducted by a panel of experts on the next generation nuclear plant (NGNP) design (consideration given to both pebble-bed and prismatic gas-cooled reactor configurations). Safety-relevant phenomena, importance, and knowledge base were assessed for the following event classes: (1) normal operation (including some reactor physics aspects), (2) general loss of forced circulation (G-LOFC), (3) pressurized loss-of-forced circulation (P-LOFC), (4) depressurized loss-of-forced circulation (D-LOFC), (5) air ingress (following D-LOFC), (6) reactivity transients - including anticipated transients without scram (ATWS), (7) processes coupled via intermediate heat exchanger (IHX) (IHX failure with molten salt), and (8) steam/water ingress. The panel's judgment of the importance ranking of a given phenomenon (or process) was based on the effect it had on one or more figures of merit or evaluation criteria. These included public and worker dose, fuel failure, and primary (and other safety) system integrity. The major phenomena of concern that were identified and categorized as high importance combined with medium to low knowledge follow: (1) core coolant bypass flows (normal operation), (2) power/flux profiles (normal operation), (3) outlet plenum flows (normal operation), (4) reactivity-temperature feedback coefficients for high-plutonium-content cores (normal operation and …
Date:
March 1, 2008
Creator:
Ball, Sydney J; Corradini, M.; Fisher, Stephen Eugene; Gauntt, R.; Geffraye, G.; Gehin, Jess C et al.
Object Type:
Report
System:
The UNT Digital Library
A NOVEL SENSOR AND MEASUREMENT SYSTEM FOR FIRESIDE CORROSION MONITORING IN COAL-FIRED BOILERS
Fireside corrosion in coal-fired power plants is a major obstacle to increase the overall efficiency for power producers. The increased use of opportunity fuels and low emission combustion modes have aggravated the corrosion on boiler tube walls in power plants. Corrosion-induced equipment failure could lead to catastrophic damage and inflict significant loss of production and cost for repair. Monitoring fireside corrosion in a reliable and timely manner can provide significant benefits to the plant operation. Current corrosion inspection and measurement are typically performed during scheduled maintenance outages, which is often after the damage is done. In the past, there have been many attempts to develop real time continuous corrosion monitoring technologies. However, there is still no short-term, online corrosion monitoring system commercially available for fireside corrosion to date due to the extremely harsh combustion environment. This report describes the results of a laboratory feasibility study on the development effort of a novel sensor for on-line fireside corrosion monitoring. A novel sensor principle and thin-film technologies were employed in the corrosion sensor design and fabrication. The sensor and the measurement system were experimentally studied using laboratory muffle furnaces. The results indicated that an accurate measure of corrosion rate could be made …
Date:
March 1, 2003
Creator:
Ban, Heng & Li, Zuoping
Object Type:
Report
System:
The UNT Digital Library
Estimating design costs for first-of-a-kind projects
Modern scientific facilities are often outcomes of projects that are first-of-a-kind, that is, minimal historical data are available for project costs and schedules. However, at Fermilab, there was an opportunity to execute two similar projects consecutively. In this paper, a comparative study of the design costs for these two projects is presented using earned value methodology. This study provides some insights into how to estimate the cost of a replicated project.
Date:
March 1, 2006
Creator:
Banerjee, Bakul
Object Type:
Article
System:
The UNT Digital Library
NAWIG News: The Quarterly Newsletter of the Native American Wind Interest Group, Spring 2008
The United States is home to more than 700 American Indian tribes and Native Alaska villages and corporations located on 96 million acres. Many of these tribes and villages have excellent wind resources that could be commercially developed to meet their electricity needs or for electricity export. The Wind Powering America program engages Native Americans in wind energy development, and as part of that effort, the NAWIG newsletter informs readers of events in the Native American/wind energy community. This issue features an interview with Steven J. Morello, director of DOE's newly formed Office of Indian Energy Policy and Programs, and a feature on the newly installed Vestas V-47 turbine at Turtle Mountain Community College.
Date:
March 1, 2008
Creator:
Baranowski, R.
Object Type:
Report
System:
The UNT Digital Library
Mesotron Decays and the Role of Anomalies
None
Date:
March 1, 2007
Creator:
Bardeen, William A.
Object Type:
Article
System:
The UNT Digital Library
Mesotron decays and the role of anomalies
None
Date:
March 1, 2007
Creator:
Bardeen, William A.
Object Type:
Article
System:
The UNT Digital Library
Weak Mixing and Rare Decays in the Littlest Higgs Model
Little Higgs models have been introduced to resolve the fine-tuning problems associated with the stability of the electroweak scale and the constraints imposed by the precision electroweak analysis of experiments testing the Standard Model of particle physics. Flavor physics provides a sensitive probe of the new physics contained in these models at next-to-leading order.
Date:
March 1, 2007
Creator:
Bardeen, William A.
Object Type:
Article
System:
The UNT Digital Library