Collection
Office of Scientific & Technical Information Technical Reports
425
Congressional Research Service Reports
124
Government Accountability Office Reports
57
Texas Patents
54
Texas Attorney General Opinions
50
Technical Report Archive and Image Library
45
TRAIL Microcard Collection
21
National Advisory Committee for Aeronautics Collection
19
Texas Register
9
Texas State Publications
8
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780 Matching Results
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Sample Taking Device
Patent for an oil sample-taking device.
Date:
February 25, 1919
Creator:
Dodds, Redus D.
Object Type:
Patent
System:
The Portal to Texas History
Gas Producer
Patent for a new and more efficient type of gas producer.
Date:
February 25, 1919
Creator:
Modlin, Frank E.
Object Type:
Patent
System:
The Portal to Texas History
Four Wheel Drive Mechanism
Patent for giving engine power equally to all four wheels of a vehicle.
Date:
February 25, 1919
Creator:
Littlejohn, Lonzo B.
Object Type:
Patent
System:
The Portal to Texas History
Cultivator
Patent for turning and clearing cotton.
Date:
February 25, 1919
Creator:
Goodman, W. T.
Object Type:
Patent
System:
The Portal to Texas History
Uranium-bearing carbonaceous nodules of southwestern Oklahoma
This paper concerns work done by the U.S. Geological Survey on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission.
Date:
February 25, 1957
Creator:
Hill, James W.
Object Type:
Report
System:
The UNT Digital Library
Geophysical and geochemical models of the Earth's shields and rift zones
This report summarizes a collection of, synthesis of, and speculation on the geophysical and geochemical models of the earth's stable shields and rift zones. Two basic crustal types, continental and oceanic, and two basic mantle types, stable and unstable, are described. It is pointed out that both the crust and upper mantle play a strongly interactive role with surface geological phenomena ranging from the occurrence of mountains, ocean trenches, oceanic and continental rifts to geographic distributions of earthquakes, faults, and volcanoes. On the composition of the mantle, there is little doubt regarding the view that olivine constitutes a major fraction of the mineralogy of the earth's upper mantle. Studies are suggested to simulate the elasticity and composition of the earth's lower crust and upper mantle.
Date:
February 25, 1977
Creator:
Chung, D. H.
Object Type:
Report
System:
The UNT Digital Library
Tank study committee report
Six major problem areas have surfaced in the past twenty-five years concerning the use of plutonium tankage. The most significant of these involves the use of borosilicate glass as a neutron absorber. Approximately thirty recommendations and criteria resulted from a study of these problem areas. Not all of the criteria and recommendations are unanimously supported by all members of the committee. The committee agrees that problem areas that can be handled on a short-term basis are being pursued expeditiously. Most of the criteria presented will apply to new tankage to be installed. The committee also noted fourteen accomplishments in the last 1/sup 1///sub 2/ years directed to the application of the criteria.
Date:
February 25, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Development of optimum conditions for drying ion exchange resin in a fluidized bed dryer
Drying of Amberlite IRC-72 ion exchange resin in a fluidized bed dryer was investigated. Resin water content was measured as a function of drying time for various drying temperatures, bed loadings, and air flow rates. An incomplete equation for the induction period and complete model for constant rate drying were developed. Further development of an induction period model requires installation of an accurate air flow measurement device. A drying temperature of 200/sup 0/F results in the shortest drying time with no resin damage. Optimization of the process with regard to other process parameters requires development of a complete drying model. (auth)
Date:
February 25, 1976
Creator:
Vora, J. N.; Michaels, S. L. & Stiros, P.
Object Type:
Report
System:
The UNT Digital Library
DT fusion neutron irradiation of ANL electron microscopy samples, LLL ''tritium-tricked'' niobium, LLL Al/sub 2/O/sub 3/, SiC, and B/sub 4/C, and an LLL sputtering experiment
The experimental procedure for irradiating the above specimens is given. No results are presented. (MOW)
Date:
February 25, 1976
Creator:
MacLean, S. C.
Object Type:
Report
System:
The UNT Digital Library
KEWB facilities decontamination and disposition. Final report
The decontamination and disposition of the KEWB facilities, Buildings 073, 643, 123, and 793, are complete. All of the facility equipment, including reactor enclosure, reactor vessel, fuel handling systems, controls, radioactive waste systems, exhaust systems, electrical services, and protective systems were removed from the site. Buildings 643, 123, and 793 were completely removed, including foundations. The floor and portions of the walls of Building 073 were covered over by final grading. Results of the radiological monitoring and the final survey are presented. 9 tables, 19 figures. (auth)
Date:
February 25, 1976
Creator:
Ureda, B. F.
Object Type:
Report
System:
The UNT Digital Library
Building 003 decontamination and disposition. Final report
The decontamination and disposition (D and D) of the contaminated facilities in Building 003 are complete. The Hot Cave, the building radioactive exhaust system, the radioactive liquid waste system, and the fume hoods were removed. The more significant D and D activities are summarized, special techniques are noted, and problems and their resolution are discussed. Results of the radiological monitoring are presented. (auth)
Date:
February 25, 1976
Creator:
Ureda, B. F.
Object Type:
Report
System:
The UNT Digital Library
Effects of random errors in coil locations in a high-field superconducting accelerator
None
Date:
February 25, 1972
Creator:
Parzen, G.
Object Type:
Report
System:
The UNT Digital Library
Mexican Americans: Political Power, Influence, or Resource
This report presents some findings about representation of Mexican Americans in the executive branch of government in the United States.
Date:
February 25, 1977
Creator:
Baird, Frank L.
Object Type:
Report
System:
The Portal to Texas History
Texas Preventable Disease News, Volume 49, Number 8, February 25, 1989
Newsletter of the Texas Bureau of Disease Control and Epidemiology discussing the news, activities, and events of the organization and other information related to health in Texas.
Date:
February 25, 1989
Creator:
Texas. Bureau of Disease Control and Epidemiology.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Preventable Disease News, Volume 44, Number 8, February 25, 1984
Newsletter of the Texas Bureau of Disease Control and Epidemiology discussing the news, activities, and events of the organization and other information related to health in Texas.
Date:
February 25, 1984
Creator:
Texas. Bureau of Disease Control and Epidemiology.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Investigation of in situ hydrothermal oxidative destruction of NDMA
Rate constants for the aqueous oxidation of N-nitrosodimethylamine (NDMA) have been measured in aqueous phosphate-buffered solutions using Dickson-type vessels. The initial NDMA concentrations ranged from 2.5 to 2.8 ppm and reaction temperatures varied from 180 C to 220 C. Quantitation of NDMA was performed by gas chromatography-mass spectrometry (GC-MS) using selected ion monitoring (SIM). NDMA loss with concomitant production of nitrite and nitrate confirmed that mineralization of NDMA occurred, and no intermediates amenable to GC-MS were formed during the oxidation experiments. First order reaction rate constants for the loss of NDMA were determined by the integral method and the results are as follows: k{sub 1} = 5.21 x 10{sup -7} s{sup -1} at 180 C, k{sub 1} = 1.14 x 10{sup -6} s{sup -1} at 190 C, k{sub 1} = 2.05 x 10{sup -6} s{sup -1} at 200 C, k{sub 1} = 4.53 x 10{sup -6} s{sup -1} at 210 C and k{sub 1} = 8.81 x 10{sup -6} s{sup -1} at 220 C. The Arrhenius equation for this data is listed below: ln (k) = 20.21 - 15716 (1/T). The activation energy for this process is calculated to be 130.7 {+-} 3.5 kJ/mole. Extrapolating to a temperature of 125 …
Date:
February 25, 1999
Creator:
Leif, R N; Knauss, K G & Aines, R D
Object Type:
Report
System:
The UNT Digital Library
Cold Dissolved Saltcake Waste Simulant Development, Preparation, and Analysis
CH2M Hill Hanford Group, Inc. is identifying and developing supplemental process technologies to accelerate the Hanford tank waste cleanup mission. Bulk vitrification, containerized grout, and steam reforming are three technologies under consideration for treatment of the radioactive saltcake wastes in 68 single-shell tanks. To support development and testing of these technologies, Pacific Northwest National Laboratory (PNNL) was tasked with developing a cold dissolved saltcake simulant formulation to be representative of an actual saltcake waste stream, preparing a 25-L batch of the simulant, and analyzing the composition of the batch to assure conformance to formulation targets. Lacking a defined composition for dissolved actual saltcake waste, PNNL used available tank waste composition information and an equilibrium chemistry model (Environmental Simulation Program, ESP) to predict the concentrations of analytes in solution. Observations of insoluble solids in initial laboratory preparations for the model predicted formulation prompted minor modifications in the concentration of phosphate and silicon in the final simulant formulation. The analytical results for the 25-L simulant batch agree within the expected measurement accuracy (~10%) of the target concentrations and are highly consistent for replicate measurements, with a few minor exceptions. The instrumental analyses indicate that the batch of solution adequately reflects the as-formulated …
Date:
February 25, 2003
Creator:
Rassat, Scot D.; Mahoney, Lenna A.; Russell, Renee L.; Bryan, Samuel A. & Sell, Rachel L.
Object Type:
Report
System:
The UNT Digital Library
An Integrated Performance Visualizer for MPI/OpenMP Programs
Cluster computing has emerged as a defacto standard in parallel computing over the last decade. Now, researchers have begun to use clustered, shared-memory multiprocessors (SMPs) to attack some of the largest and most complex scientific calculations in the world today [2, 1], running them on the world's largest machines including the US DOE ASCI platforms: Red, Blue Mountain, Blue Pacific, and White. MPI has been the predominant programming model for clusters [3]; however, as users move to ''wider'' SMPs, the combination of MPI and threads has a ''natural fit'' to the underlying system design: use MPI for managing parallelism between SMPs and threads for parallelism within one SMP. OpenMP is emerging as a leading contender for managing parallelism within an SMP. OpenMP and MPI offer their users very different characteristics. Developed for different memory models, they fill diametrically opposed needs for parallel programming. OpenMP was made for shared memory systems, while MPI was made for distributed memory systems. OpenMP was designed for explicit parallelism and implicit data movement, while MPI was designed for explicit data movement and implicit parallelism. This difference in focus gives the two parallel programming frameworks very different usage characteristics. But these complementary usage characteristics make the …
Date:
February 25, 2001
Creator:
Hoeflinger, J.; Kuhn, B.; Petersen, P.; Rajic, H.; Shah, S.; Vetter, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Clean Reliable Water for the 21st Century (Paper#69880)
It is well recognized that half the countries in the world will face significant fresh water shortages in the next 20 years, due largely to growing populations and increased agricultural and industrial demands. These shortages will significantly limit economic growth, decrease the quality of life and human health for billions of people, and could potentially lead to violence and conflict over securing scarce supplies of water. These concerns are not limited to the water-poor countries, of course, as many parts of China and the US face similar problems. Such problems can be exacerbated by fluctuating imbalances between need and supply, poor management practices, and pollution. The future is one that will require significant scientific and technological advances in conservation, preservation, and movement of fresh water, as well as in the development of new or alternative supplies. As an example, these issues are discussed in terms of California, and a case study related to the scientific issues associated with a groundwater banking project in Southern California is provided.
Date:
February 25, 2003
Creator:
Tompson, A. F. B.; Hudson, G. B. & Maxwell, R. M.
Object Type:
Article
System:
The UNT Digital Library
Micro Benchmarking, Performance Assertions and Sensitivity Analysis: A Technique for Developing Adaptive Grid Applications
This study presents a technique that can significantly improve the performance of a distributed application by allowing the application to locally adapt to architectural characteristics of distinct resources in a distributed system. Application performance is sensitive to application parameter--system architecture pairings. In a distributed or Grid enabled applciation, a single parameter configuration for the whole application will not always be optimal for every participating resource. In particular, some configurations can significantly degrade performance. Furthermore, the behavior of a system may change during the course of the run. The technique described here provides an automated mechanism for run-time adaptation of application parameters to the local system architecture. Using a simulation of a Monte Carlo physics code, the authors demonstrate that this technique can achieve speedups of 18%-37% on individual resources in a distributed environment.
Date:
February 25, 2002
Creator:
Corey, I R; Johnson, J R & Vetter, J S
Object Type:
Article
System:
The UNT Digital Library
Fundamental nucleon-nucleon interaction: probing exotic nuclear structure using GEANIE at LANCE/WNR
The initial goal of this project was to study the in-medium nucleon-nucleon interaction by testing the fundamental theory of nuclear structure, the shell model, for nuclei between {sup 8}Zr and {sup 100}Sn. The shell model predicts that nuclei with ''magic'' (2,8,20,28,40,50, and 82) numbers of protons or neutrons form closed shells in the same fashion as noble gas atoms [may49]. A ''doubly magic'' nucleus with a closed shell of both protons and neutrons has an extremely simple structure and is therefore ideal for studying the nucleon-nucleon interaction. The shell model predicts that doubly magic nuclei will be spherical and that they will have large first-excited-state energies ({approx} 1 to 3 MeV). Although the first four doubly-magic nuclei exhibit this behavior, the N = Z = 40 nucleus, {sup 80}Zr, has a very low first-excited-state energy (290 keV) and appears to be highly deformed. This breakdown is attributed to the small size of the shell gap at N = Z = 40. If this description is accurate, then the N = Z = 50 doubly magic nucleus, {sup 100}Sn, will exhibit ''normal'' closed-shell behavior. The unique insight provided by doubly-magic nuclei from {sup 80}Zr to {sup 100}Sn has made them the …
Date:
February 25, 2000
Creator:
Bernstein, L
Object Type:
Report
System:
The UNT Digital Library
Isentropic Compression Loading of HMX and the Pressure-induced Phase Transition at 27 GPa
The 27 GPa pressure-induced epsilon-phi phase transition in HMX is explored using the Isentropic Compression Experiment (ICE) technique at the Sandia National Laboratories Z-machine facility. Our data indicate that this phase transition is sluggish and if it does occur to any extent under the time scales (200-500 ns) and strain rates (5 x 10{sup 5}) typical of ICE loading conditions, the amount of conversion is small.
Date:
February 25, 2004
Creator:
Hare, D E; Reisman, D B; Dick, J J & Forbes, J W
Object Type:
Article
System:
The UNT Digital Library
Computational Theory of Warm Condensed Matter
We have developed an improved computational theory of condensed matter in the regime where T {le} T{sub Fermi}. Previous methods of calculating the equation of state (EOS) relied on interpolation between low-temperature (solid) and high-temperature (plasma) limits, or employed severe approximations. Recent theoretical and experimental developments have highlighted the need for accurate EOS and opacity data in the intermediate temperature range and offer the opportunity to test theoretical models. We describe our results for EOS and optical properties for temperatures up to 10{sup 6} K, and describe directions for future work.
Date:
February 25, 2001
Creator:
Barbee, T. W.; Surh, M. P. & Benedict, L. X.
Object Type:
Report
System:
The UNT Digital Library
Demonstration of Record BER and Number of Users for Optical CDMA (O-CDMA), with Implications to Secure Communications
We demonstrate a BER of 10{sup -11} for 16 simultaneous users, using wavelength/time O-CDMA. We show the extent to which severe multi-access interference can be used to mask and/or degrade the signal from an intruder.
Date:
February 25, 2005
Creator:
Mendez, A. J.; Hernandez, V. J.; Bennett, C. V.; Gagliardi, R. M. & Lennon, W. J.
Object Type:
Article
System:
The UNT Digital Library