Partner
UNT Libraries Government Documents Department
1,010
Oklahoma Historical Society
135
UNT Libraries Special Collections
89
Texas Historical Commission
52
Sterling Municipal Library
26
UNT Music Library
25
UNT Libraries
19
Carl Albert Congressional Research and Studies Center
18
Alvin Community College
14
Comanche Public Library
12
70 More
Collection
Office of Scientific & Technical Information Technical Reports
903
Texas Digital Newspaper Program
303
Oklahoma Digital Newspaper Program
157
Tocker Foundation Grant
128
THC National Register Collection
50
Congressional Research Service Reports
44
Chickasha Newspaper Collection
31
Altus Times-Democrat
26
The Baytown Sun
26
KXAS-NBC 5 News Collection
26
127 More
Degree Department
Degree Level
Country
States
Year
Month
Results:
1 - 24 of
1,661
next
2-D linear motion system. Innovative technology summary report
The US Department of Energy's (DOE's) nuclear facility decontamination and decommissioning (D and D) program requires buildings to be decontaminated, decommissioned, and surveyed for radiological contamination in an expeditious and cost-effective manner. Simultaneously, the health and safety of personnel involved in the D and D activities is of primary concern. D and D workers must perform duties high off the ground, requiring the use of manlifts or scaffolding, often, in radiologically or chemically contaminated areas or in areas with limited access. Survey and decontamination instruments that are used are sometimes heavy or awkward to use, particularly when the worker is operating from a manlift or scaffolding. Finding alternative methods of performing such work on manlifts or scaffolding is important. The 2-D Linear Motion System (2-D LMS), also known as the Wall Walker{trademark}, is designed to remotely position tools and instruments on walls for use in such activities as radiation surveys, decontamination, and painting. Traditional (baseline) methods for operating equipment for these tasks require workers to perform duties on elevated platforms, sometimes several meters above the ground surface and near potential sources of contamination. The Wall Walker 2-D LMS significantly improves health and safety conditions by facilitating remote operation of equipment. …
Date:
November 1, 1998
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
2020 Vision Project Summary, FY98
The 2020 Vision project began in 1996 with two participating teachers and four classes. It has since grown to comprise more than a dozen participating teachers and hundreds of students across the country. Much of this growth took place in FY98, thanks to the accomplishment of several major goals: implementation of a mentor program, enhanced teacher training, a mid-year conference for students, recruitment of distant schools, and the development of an interactive Web site. The first part of this report describes these accomplishments, as well as future directions for 2020 Vision. The second part summarized the scenarios students wrote during the 1997-98 school year. it identifies recurrent themes in the students' scenarios and compares/contrasts them with scenarios written in the first two years of the project.
Date:
November 1, 1998
Creator:
Munoz, A.; Clausen, J. C.; Scott, K. P. & Gordon, K. W.
Object Type:
Report
System:
The UNT Digital Library
3D finite-difference seismic migration with parallel computers
The ability to image complex geologies such as salt domes in the Gulf of Mexico and thrusts in mountainous regions is essential for reducing the risk associated with oil exploration. Imaging these structures, however, is computationally expensive as datasets can be terabytes in size. Traditional ray-tracing migration methods cannot handle complex velocity variations commonly found near such salt structures. Instead the authors use the full 3D acoustic wave equation, discretized via a finite difference algorithm. They reduce the cost of solving the apraxial wave equation by a number of numerical techniques including the method of fractional steps and pipelining the tridiagonal solves. The imaging code, Salvo, uses both frequency parallelism (generally 90% efficient) and spatial parallelism (65% efficient). Salvo has been tested on synthetic and real data and produces clear images of the subsurface even beneath complicated salt structures.
Date:
November 1998
Creator:
Ober, C. C.; Gjertsen, R.; Minkoff, S. & Womble, D. E.
Object Type:
Article
System:
The UNT Digital Library
3d-Metal Doped into LiMn2O4 Thin Films
3d-metal (Me) doped LiMn{sub 2}O{sub 4} thin films were deposited by rf magnetron sputtering of Li[Mn{sub 1.9}Me{sub 0.1}]O{sub 4} targets in Ar + N{sub 2} and Ar + O{sub 2} gas mixtures and annealed at 750{degrees}C in O{sub 2} for 1 h. From XRD measurements, the structure of the Me-doped thin film was dependent upon the element and the deposition conditions. The doping level of Me/Mn of cubic phase was less than 0.1 by EDX measurements. The Ti-LiMn{sub 2}O{sub 4} films exhibited a capacity close to theoretical for stoichiometric LiMn{sub 2}O{sub 4}. This improvement at 4 V comes at the expense of the capacity at 5 V. Cells with Ti-doped films exhibited the same low capacity fade as those with undoped LiMn{sub 2}O{sub 4} cathodes. Similar electrochemical changes were observed with the Cr- and Zn-LiMn{sub 2}O{sub 4} films. The discharge capacities above 4.5 V for the Ni-doped films were about equal to those below 4.5 V, and the thin-film cells could be cycled reversibility between 3.5 and 5.3 V.
Date:
November 1, 1998
Creator:
Bates, J.B.; Ueda, A. & Zuhr, R.A.
Object Type:
Article
System:
The UNT Digital Library
Accumulation of α-Keto Acids as Essential Components in Cyanide Assimilation by Pseudomonas fluorescens NCIMB 11764
Article on the accumulation of α-Keto acids as essential components in cyanide assimilation by Pseudomonas fluorescens NCIMB 11764.
Date:
November 1, 1998
Creator:
Kunz, Daniel A.; Chen, Jui-Lin & Pan, Guangliang
Object Type:
Article
System:
The UNT Digital Library
[Acetyl-CoA cleavage and synthesis in methanogens]. Progress report, September 1994--August 1997
The acetyl-CoA decarbonylase synthase (ACDS) complex has been detected in a variety of methanogens including species of Methanosarcina, Methanothrix (i.e., Methanosaeta), and Methanococcus. The multienzyme complex from Methanosarcina barkeri is composed of five different subunits, possibly arranged in an {alpha}{sub 6}{beta}{sub 6}{gamma}{sub 6}{delta}{sub 6}{var_epsilon}{sub 6} structure with the individual subunits of molecular masses (kDa) of 89, 60, 50, 48, and 20, respectively. This progress report summarizes the work from the past 21 months on studies directed toward understanding how the ACDS complex functions in the physiology of acetate-cleaving, and acetate-synthesizing methanogens.
Date:
November 1, 1998
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Achromat with linear space charge for bunched beams
The standard definition for an achromat is a transport line having zero values for the spatial dispersion (R16) and the angular dispersion (R26). For a bunched beam with linear space charge this definition of achromaticity does not hold. The linear space charge in the presence of a bend provides coupling between (a) bunch spatial width and bunch length (R15) and (b) bunch angular spread and bunch length (R25). Therefore, achromaticity should be redefined as a line having zero values of the spatial dispersion (R16), the angular dispersion (R26), and matrix elements R15 and R25. These additional conditions (R15 = R25 = 0) can be achieved, for example, with two small RF cavities at appropriate locations in the achromat, to cancel space charge effects. An example of the application of this technique to the Spallation Neutron Source (SNS) high energy beam transport line will be presented.
Date:
November 1, 1998
Creator:
Raparia, D.; Alessi, J. G.; Lee, Y. Y. & Weng, W. T.
Object Type:
Article
System:
The UNT Digital Library
Actinide Recovery Method for Large Soil Samples
A new Actinide Recovery Method has been developed by the Savannah River Site Central Laboratory to preconcentrate actinides in very large soil samples. Diphonix Resin(r) is used eliminate soil matrix interferences and preconcentrate actinides after soil leaching or soil fusion. A rapid microwave digestion technique is used to remove the actinides from the Diphonix Resin(r). After the resin digestion, the actinides are recovered in a small volume of nitric acid which can be easily loaded onto small extraction-chromatography columns, such as TEVA Resin(r), U-TEVA Resin(r) or TRU Resin(r) (Eichrom Industries). This method enables the application of small, selective extraction-columns to recover actinides from very large soil samples with high selectivity, consistent tracer recoveries and minimal liquid waste.
Date:
November 1998
Creator:
Maxwell, S. L., III & Nichols, S.
Object Type:
Article
System:
The UNT Digital Library
Adaptive heterogeneous multi-robot teams
This research addresses the problem of achieving fault tolerant cooperation within small- to medium-sized teams of heterogeneous mobile robots. The author describes a novel behavior-based, fully distributed architecture, called ALLIANCE, that utilizes adaptive action selection to achieve fault tolerant cooperative control in robot missions involving loosely coupled, largely independent tasks. The robots in this architecture possess a variety of high-level functions that they can perform during a mission, and must at all times select an appropriate action based on the requirements of the mission, the activities of other robots, the current environmental conditions, and their own internal states. Since such cooperative teams often work in dynamic and unpredictable environments, the software architecture allows the team members to respond robustly and reliably to unexpected environmental changes and modifications in the robot team that may occur due to mechanical failure, the learning of new skills, or the addition or removal of robots from the team by human intervention. After presenting ALLIANCE, the author describes in detail the experimental results of an implementation of this architecture on a team of physical mobile robots performing a cooperative box pushing demonstration. These experiments illustrate the ability of ALLIANCE to achieve adaptive, fault-tolerant cooperative control amidst …
Date:
November 1, 1998
Creator:
Parker, L. E.
Object Type:
Article
System:
The UNT Digital Library
Adaptive importance sampling of random walks on continuous state spaces
The authors consider adaptive importance sampling for a random walk with scoring in a general state space. Conditions under which exponential convergence occurs to the zero-variance solution are reviewed. These results generalize previous work for finite, discrete state spaces in Kollman (1993) and in Kollman, Baggerly, Cox, and Picard (1996). This paper is intended for nonstatisticians and includes considerable explanatory material.
Date:
November 1, 1998
Creator:
Baggerly, K.; Cox, D. & Picard, R.
Object Type:
Report
System:
The UNT Digital Library
Adaptive Readout Technique For A Sixteen Channel Peak Sensing ADC In the FERA Format
An adaptive, variable block-size readout technique for use with multiple, sixteen-channel CAMAC ADCs with a FERA-bus readout has been developed and designed. It can be used to read data from experiments with or without coincidence, i.e. singles, without having to change the readout protocol. Details of the implementation are discussed and initial results are presented. Further applications of the adaptive readout are also discussed.
Date:
November 1, 1998
Creator:
Yaver, H.; Maier, M. R.; Lindstrom, D. & Ludewigt, B. A.
Object Type:
Article
System:
The UNT Digital Library
The adsorption of water vapor on carbon fiber composite molecular sieve
Carbon Fiber Composite Molecular Sieve (CFCMS) is a porous adsorbent carbon material manufactured from isotropic pitch derived carbon fibers and a phenolic resin binder via a slurry molding process. The material is produced in the form of a monolith and can be activated in steam, CO{sub 2} or O{sub 2}, during which it develops high BET surface areas and micropore volumes. The material has a continuous carbon skeletal structure and is, therefore, electrically conductive. The passage of an electric current at low voltage allows for direct resistive heating of the carbon and thus provides an efficient method of desorbing adsorbed gases. This method of separating gases has been named electrical swing adsorption (ESA) and is analogous to thermal or pressure swing adsorption. Recently, the authors have examined the potential of CFCMS/ESA for the adsorption and separation of water vapor. Frequently, water vapor must be removed from a gas stream before separation and processing can occur. To assess the potential of CFCMS for water adsorption a series of CFCMS samples were manufactured and activated to relatively high burn-off. Half of each sample was treated at 200 C in flowing oxygen to increase the number of chemisorbed surface functional groups. The amount …
Date:
November 1, 1998
Creator:
Burchell, T. D.; Judkins, R. R. & Rogers, M. R.
Object Type:
Report
System:
The UNT Digital Library
Advanced ignition and propulsion technology program
This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). Reliable engine re-ignition plays a crucial role in enabling commercial and military aircraft to fly safely at high altitudes. This project addressed research elements critical to the optimization of laser-based igniter. The effort initially involved a collaborative research and development agreement with B.F. Goodrich Aerospace and Laser Fare, Inc. The work involved integrated experiments with theoretical modeling to provide a basic understanding of the chemistry and physics controlling the laser-induced ignition of fuel aerosols produced by turbojet engine injectors. In addition, the authors defined advanced laser igniter configurations that minimize laser packaging size, weight, complexity and power consumption. These innovative ignition concepts were shown to reliably ignite jet fuel aerosols over a broad range of fuel/air mixture and a t fuel temperatures as low as -40 deg F. The demonstrated fuel ignition performance was highly superior to that obtained by the state-of-the-art, laser-spark ignition method utilizing comparable laser energy. The authors also developed a laser-based method that effectively removes optically opaque deposits of fuel hydrocarbon combustion residues from laser window surfaces. Seven patents have been either issued or …
Date:
November 1, 1998
Creator:
Oldenborg, R.; Early, J. & Lester, C.
Object Type:
Report
System:
The UNT Digital Library
Advanced Micro Optics Characterization Using Computer Generated Holograms
This CRADA has enabled the validation of Computer Generated Holograms (CGH) testing for certain classes of micro optics. It has also identified certain issues that are significant when considering the use of CGHs in this application. Both contributions are advantageous in the pursuit of better manufacturing and testing technologies for these important optical components.
Date:
November 1, 1998
Creator:
Arnold, S.; Maxey, L.C.; Moreshead, W. & Nogues, J.L.
Object Type:
Report
System:
The UNT Digital Library
Advanced modeling of high intensity accelerators
This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The goals of this project were three-fold: (1) to develop a new capability, based on high performance (parallel) computers, to perform large scale simulations of high intensity accelerators; (2) to apply this capability to modeling high intensity accelerators under design at LANL; and (3) to use this new capability to improve the understanding of the physics of intense charge particle beams, especially in regard to the issue of beam halo formation. All of these goals were met. In particular, the authors introduced split-operator methods as a powerful and efficient means to simulate intense beams in the presence of rapidly varying accelerating and focusing fields. They then applied these methods to develop scaleable, parallel beam dynamics codes for modeling intense beams in linacs, and in the process they implemented a new three-dimensional space charge algorithm. They also used the codes to study a number of beam dynamics issues related to the Accelerator Production of Tritium (APT) project, and in the process performed the largest simulations to date for any accelerator design project. Finally, they used the new modeling capability …
Date:
November 1, 1998
Creator:
Ryne, R. D.; Habib, S. & Wangler, T. P.
Object Type:
Report
System:
The UNT Digital Library
Advanced NMR technology for bioscience and biotechnology
This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). NMR plays critical roles in bioscience and biotechnology in both imaging and structure determination. NMR is limited, however, by the inherent low sensitivity of the NMR experiment and the demands for spectral resolution required to study biomolecules. The authors addressed both of these issues by working on the development of NMR force microscopy for molecular imaging, and high field NMR with isotope labeling to overcome limitations in the size of biomolecules that can be studied using NMR. A novel rf coil design for NMR force microscopy was developed that increases the limits of sensitivity in magnetic resonance detection for imaging, and the authors demonstrated sub-surface spatial imaging capabilities. The authors also made advances in the miniaturization of two critical NMR force microscope components. They completed high field NMR and isotope labeling studies of a muscle protein complex which is responsible for regulating muscle contraction and is too large for study using conventional NMR approaches.
Date:
November 1, 1998
Creator:
Hammel, P. C.; Hernandez, G.; Trewhella, J.; Unkefer, C. J.; Boumenthal, D. K.; Kennedy, M. A. et al.
Object Type:
Report
System:
The UNT Digital Library
Advanced three-dimensional Eulerian hydrodynamic algorithm development
This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The purpose of this project is to investigate, implement, and evaluate algorithms that have high potential for improving the robustness, fidelity and accuracy of three-dimensional Eulerian hydrodynamic simulations. Eulerian computations are necessary to simulate a number of important physical phenomena ranging from the molding process for metal parts to nuclear weapons safety issues to astrophysical phenomena such as that associated with a Type 2 supernovae. A number of algorithmic issues were explored in the course of this research including interface/volume tracking, surface physics integration, high resolution integration techniques, multilevel iterative methods, multimaterial hydrodynamics and coupling radiation with hydrodynamics. This project combines core strengths of several Laboratory divisions. The project has high institutional benefit given the renewed emphasis on numerical simulations in Science-Based Stockpile Stewardship and the Accelerated Strategic Computing Initiative and LANL`s tactical goals related to high performance computing and simulation.
Date:
November 1, 1998
Creator:
Rider, W. J.; Kothe, D. B. & Mosso, S.
Object Type:
Report
System:
The UNT Digital Library
I. Advances in NMR Signal Processing. II. Spin Dynamics in Quantum Dissipative Systems
None
Date:
November 1, 1998
Creator:
Lin, Yung-Ya
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Age, Volume 21, Number 11, November 1998
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:
November 1998
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Aging of polyurethane foam insulation in simulated refrigerator panels -- Initial results with third-generation blowing agents
Laboratory data are presented on the effect of constant-temperature aging on the apparent thermal conductivity of polyurethane foam insulation for refrigerators and freezers. The foam specimens were blown with HCFC-141b and with three of its potential replacements -- HFC-134a, HFC-245fa, and cyclopentane. Specimens were aged at constant temperatures of 90 F, 40 F, and {minus}10 F. Thermal conductivity measurements were made on two types of specimens: full-thickness simulated refrigerator panels containing foam enclosed between solid plastic sheets, and thin slices of core foam cut from similar panels. Results are presented for about 250 days of aging for the core-foam specimens and for the first six months of aging for the full-thickness panels.
Date:
November 1998
Creator:
Wilkes, K. E.; Gabbard, W. A. & Weaver, F. J.
Object Type:
Report
System:
The UNT Digital Library
AIJ in the Non-Energy Sector in India: Opportunities and Concerns
Although the U.N. Framework Convention on Climate Change (FCCC) has been signed and ratified by 168 countries, global greenhouse gas (GHG) emissions have increased substantially since the 1992 Rio Summit. In both developing countries (DCs) and industrialized countries (ICs), there has been a need to find mechanisms to facilitate environmentally sound mitigation strategies. This need led to the formation of Activities Implemented Jointly (AIJ) at the first Conference-of the Parties (COP) in 1995. In Article 4A, para 2D, the COP established an AIJ pilot phase in which Annex I (IC) countries would enter into agreements to implement activities jointly with non-Annex I parties. DCs would engage in AIJ on a purely voluntary basis and all AIJ projects should be compatible with and supportive of national environment and development goals. AIJ does not imply GHG reduction commitments by DCs. Neither do all projects undertaken during the pilot phase qualify as a fulfillment of current commitment s of Annex I parties under the COP. The current pilot phase for AIJ ends in the year 2000, a date which may be extended. Current AIJ activities are largely focused on the energy sector. The Nordic countries, for example, feel that the most important potential …
Date:
November 1, 1998
Creator:
Ravindranath, N. H.; Meili, A. & Anita, R.
Object Type:
Report
System:
The UNT Digital Library
Air sparging/high vacuum extraction to remove chlorinated solvents in groundwater and soil
An air sparging and high vacuum extraction was installed as an alternative to a containment pump and treat system to reduce the long-term remediation schedule. The site is located at the DOE Mound facility in Miamisburg, Ohio, just south of Dayton. The air sparging system consists of 23 wells interspersed between 17 soil vapor extraction wells. The SVE system has extracted about 1,500 lbs of VOCs in five months. The air sparging system operated for about 6 weeks before shutdown due to suspected biochemical fouling. Technical data are presented on the operating characteristics of the system.
Date:
November 1, 1998
Creator:
Phelan, J. M. & Gilliat, M. D.
Object Type:
Report
System:
The UNT Digital Library
ALTERNATIVE FUELS AND CHEMICALS FROM SYNTHESIS GAS. FINAL QUARTERLY STATUS REPORT NO. 10
The overall objectives of this program are to investigate potential technologies for the conversion of synthesis gas to oxygenated and hydrocarbon fuels and industrial chemicals, and to demonstrate the most promising technologies at DOE's LaPorte, Texas, Slurry Phase Alternative Fuels Development Unit (AFDU). The program will involve a continuation of the work performed under the Alternative Fuels from Coal-Derived Synthesis Gas Program and will draw upon information and technologies generated in parallel current and future DOE-funded contracts.
Date:
November 1, 1998
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 99, No. 198, Ed. 1 Sunday, November 1, 1998
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 1, 1998
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History