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Office of Scientific & Technical Information Technical Reports
14,059
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387
USGS Topographic Map Collection
200
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150
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146
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119
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106
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70
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96
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40
Argonne National Laboratory Reports
37
74th Legislature of Texas
35
Report of investigations (United States. Bureau of Mines)
33
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15,320 Matching Results
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Technetium Behavior and Recovery in Soil
Technetium-99 in soils is of great concern because of its long half-life and because it can not be detected readily. This work reviews the behavior of technetium in various types of soils. A method for extracting technetium from soil was developed with the use of technetium-95m and 99m to determine recoveries at each step. Technetium chemistry is very complicated and problem areas in the behavior and recovery have been highlighted. Technetium is widely used in nuclear medicine and a review of its chemistry pertaining to radiopharmaceuticals is relevant and helpful in environmental studies. The technetium behavior in the patented citric acid method for the removal of toxic metals in contaminated soils was studied. An innovative method using solid phase extraction media for the concentration of technetium extracted from soils, with water and hydrogen peroxide, was developed. This technique may have a useful environmental application for this type of remediation of technetium from contaminated soils.
Date:
December 1, 1995
Creator:
Meinken, G. E.
Object Type:
Report
System:
The UNT Digital Library
Read to Your Bunny
This document provides information on the importance of reading to children.
Date:
1995
Creator:
Texas Library Association. Children's Round Table.
Object Type:
Book
System:
The Portal to Texas History
Improving plasma shaping accuracy through consolidation of control model maintenance, diagnostic calibration, and hardware change control
With the advent of more sophisticated techniques for control of tokamak plasmas comes the requirement for increasingly more accurate models of plasma processes and tokamak systems. Development of accurate models for DIII-D power systems, vessel, and poloidal coils is already complete, while work continues in development of general plasma response modeling techniques. Increased accuracy in estimates of parameters to be controlled is also required. It is important to ensure that errors in supporting systems such as diagnostic and command circuits do not limit the accuracy of plasma parameter estimates or inhibit the ability to derive accurate plasma/tokamak system models. To address this issue, we have developed more formal power systems change control and power system/magnetic diagnostics calibration procedures. This paper discusses our approach to consolidating the tasks in these closely related areas. This includes, for example, defining criteria for when diagnostics should be re-calibrated along with required calibration tolerances, and implementing methods for tracking power systems hardware modifications and the resultant changes to control models.
Date:
December 1, 1995
Creator:
Baggest, D. S.; Rothweil, D. A.; Pang, S.; Walker, M. L. & Nerem, A.
Object Type:
Article
System:
The UNT Digital Library
Multidimensional DDT modeling of energetic materials
To model the shock-induced behavior of porous or damaged energetic materials, a nonequilibrium mixture theory has been developed and incorporated into the shock physics code, CTH. The foundation for this multiphase model is based on a continuum mixture formulation given by Baer and Nunziato. This multiphase mixture model provides a thermodynamic and mathematically-consistent description of the self-accelerated combustion processes associated with deflagration-to-detonation and delayed detonation behavior which are key modeling issues in safety assessment of energetic systems. An operator-splitting method is used in the implementation of this model, whereby phase diffusion effects are incorporated using a high resolution transport method. Internal state variables, forming the basis for phase interaction quantities, are resolved during the Lagrangian step requiring the use of a stiff matrix-free solver. Benchmark calculations are presented which simulate low-velocity piston impact on a propellant porous bed and experimentally-measured wave features are well replicated with this model. This mixture model introduces micromechanical models for the initiation and growth of reactive multicomponent flow that are key features to describe shock initiation and self-accelerated deflagration-to-detonation combustion behavior. To complement one-dimensional simulation, two-dimensional numerical calculations are presented which indicate wave curvature effects due to the loss of wall confinement. This study is …
Date:
July 1, 1995
Creator:
Baer, M. R.; Hertel, E. S. & Bell, R. L.
Object Type:
Report
System:
The UNT Digital Library
Multidimensional DDT modeling of energetic materials
A nonequilibrium continuum mixture model has been incorporated into the CTH shock physics code to describe deflagration-to-detonation transition in granular energetic materials. This approach treats multiple thermodynamic and mechanics fields including the effects of relative material motion, rate-dependent compaction and interphase exchange of mass, momentum and energy. A finite volume description is formulated and internal state variables are solved using an operator-splitting method. Numerical simulations of low-velocity impact on a weakly-confined porous propellant bed are presented which display lateral wall release leading to curved compaction and reaction wave behavior.
Date:
August 1, 1995
Creator:
Baer, M. R.; Hertel, E. S. & Bell, R. L.
Object Type:
Article
System:
The UNT Digital Library
Technical evaluation report for the demonstration of radio frequency soil decontamination at Site S-1
The Air Force`s Armstrong Laboratory at Tyndall Air Force Base, Florida, has supported the research and development of Radio Frequency Soil Decontamination. Radio frequency soil decontamination is essentially a heat-assisted soil vapor extraction process. Site S-1 at Kelly Air Force Base, San Antonio, Texas, was selected for the demonstration of two patented techniques. The site is a former sump that collected spills and surface run-off from a waste petroleum, oils, and lubricants and solvent storage and transfer area. In 1993, a technique developed by the IIT Research Institute using an array of electrodes placed in the soil was demonstrated. In 1994, a technique developed by KAI Technologies, Inc. using a single applicator placed in a vertical borehole was demonstrated. Approximately 120 tons of soil were heated during each demonstration to a temperature of about 150 degrees Celsius.
Date:
April 1, 1995
Creator:
Lyon, Chesley R.; Blanchard, Clifton F. & Whitt, Laura H.
Object Type:
Report
System:
The UNT Digital Library
Base- and Precious-Metal Concentrations of Early Proterozoic Massive Sulfide Deposits in Arizona- Crustal and Thermochemical Controls of Ore Deposition
A report about early proterozoic massive sulfide deposits associated with submarine mafic to felsic metavolcano rocks are present throughout central, west-central, and northwestern Arizona. Also, production data for copper, lead, zinc, gold, and silver for most of the known deposits and prospects in 13 metallic mineral districts are summarized.
Date:
1995
Creator:
DeWitt, Ed
Object Type:
Report
System:
The UNT Digital Library
The 1992 Eruptions of Crater Peak Vent Mount Spurr Volcano, Alaska
A report which provides an overview of eruptions from Mount Spurr and the Alaska Volcano Observatory's response to them.
Date:
1995
Creator:
Keith, Terry E. C.
Object Type:
Report
System:
The UNT Digital Library
Geologic, Geochemical, and Isotopic Studies of a Carbonate- and Siliciclastic-Hosted Pb-Zn Deposit at Lion Hill, Vermont
A report about the potential for Irish-type Pb-Zn deposits in a platform rocks of western Vermont; however, at Lion Hill they contain enrichments of Pb, Zn, and Cu rather than a Pb, Zn, and Ag association.
Date:
1995
Creator:
Foley, Nora K.; Clark, Sandra H. B.; Woodruff, Laurel G. & Mosier, Elwin L.
Object Type:
Report
System:
The UNT Digital Library
Gazetteer of Planetary Nomenclature 1994
A report about nomenclature related to planets in the solar system. It contains detailed information about all names of topographic and albedo features on planets and satellites.
Date:
1995
Creator:
Batson, Raymond M. & Russell, Joel F.
Object Type:
Report
System:
The UNT Digital Library
Problems with Applying Topographically Driven Flow to Genesis of the Upper Mississippi Valley Zinc-Lead District and to Fluid Flow in the Illinois Basin
A report about how topographically driven ground-water flow and other processes that involve dewatering of basins fail to account for the temperatures indicated by fluid inclusion and sulfur isotope studies in the Upper Mississippi Valley zinc-lead district on the northern edge of the Illinois Basin.
Date:
1995
Creator:
Spirakis, Charles S.
Object Type:
Report
System:
The UNT Digital Library
Paleocene Vertebrates from Jabal Umm Himar, Kingdom of Saudi Arabia
A report which records the Paleocene vertebrates, stratigraphy, and environment of deposition in the Jabal Umm Himar area.
Date:
1995
Creator:
Whitmore, Frank C., Jr. & Madden, Cary T.
Object Type:
Report
System:
The UNT Digital Library
Feasibility Study of Material-Balance Assessment of Petroleum from the New Albany Shale in the Illinois Basin
A report about which intends to determine the feasibility of conducting a material-balance assessment of petroleum within a sedimentary basin.
Date:
1995
Creator:
Lewan, M.D.; Comer, J. B.; Hamlton-Smith, T.; Hasenmueller, N. R.; Guthrie, J. M.; Hatch, J. R. et al.
Object Type:
Report
System:
The UNT Digital Library
Thermodynamic Properties of Minerals and Related Substances at 298.15 K and 1 Bar (105 Pascals) Pressure and at Higher Temperatures
A report about values for the entropy, molar volume, and for the enthalpy and Gibbs energy of formation for the elements and minerals and substances at 298.15 K.
Date:
1995
Creator:
Robie, Richard A. & Hemingway, Bruce S.
Object Type:
Report
System:
The UNT Digital Library
Source Rock Potential of the Lower Part of the Mississippian St. Louis Limestone in South-Central Indiana
A report about the carbonate-evaporite sequence of the lower part of the Mississippian St. Louis Limestone. There is organic rich strata that may be good to excellent hydrocarbon source rocks.
Date:
1995
Creator:
Ridgley, J. L. & Nuccio, V. F.
Object Type:
Report
System:
The UNT Digital Library
Imaging the Sea Floor
A report that provides examples of 1990's sonar advances that help map the sea floor. Two specific devices are focused on, these are the Sea Beam bathymetric mapping system and the GLORIA sidescan-sonar imaging system.
Date:
1995
Creator:
Schlee, John S.; Karl, Herman A. & Torresan, M. E.
Object Type:
Report
System:
The UNT Digital Library
Guide to the Volcanoes of the Western Wrangell Mountains, Alaska
A report that describes the geologic history of various landscapes viewed from major roadways in and around Wrangell-St. Elias National Park and Preserve.
Date:
1995
Creator:
Richter, Donald H.; Rosenkrans, Danny S. & Steigerwald, Margaret J.
Object Type:
Report
System:
The UNT Digital Library
Paleocene Vertebrates from Jabal Umm Himar, Kingdom of Saudi Arabia
A report about fossils in Saudi Arabia. The report discusses locality, higher taxon, and specimens within the taxon from a given locality.
Date:
1995
Creator:
Whitmore, Frank C., Jr.; Madden, Cary T.; Schmidt, Dwight L. & Naqvi, Ibne Mohammed
Object Type:
Report
System:
The UNT Digital Library
Lead Isotopes from the Upper Mississippi Valley District: A Regional Perspective
A report about new lead isotopic data on galena from within and peripheral to the Upper Mississippi Valley which make it possible to trace a pathway traversed by the mineralizing fluids beyond the boundary of the main district.
Date:
1995
Creator:
Millen, Timothy M.; Zartman, Robert E. & Heyl, Allen V.
Object Type:
Report
System:
The UNT Digital Library
Environmental Considerations of Active and Abandoned Mine Lands: Lessons from Summitville, Colorado
A report about some of the environmental impacts of the Summitville open-pit mine that was abandoned after 1992.
Date:
1995
Creator:
King, Trude V. V.
Object Type:
Report
System:
The UNT Digital Library
The Distribution of Rare-Earth Elements in Minerals of the Monazite Family
A report about rare-earth metals located inside minerals of the monazite family.
Date:
1995
Creator:
Rosenblum, Sam & Fleischer, Michael
Object Type:
Report
System:
The UNT Digital Library
Engineering Technology Division Long-Range Plan, 1991--1995
This Engineering Technology Division Long-Range Plan is a departure from planning processes of the past. About a year ago we decided to approach our strategic planning in a very different way. With this plan we complete the first phase of a comprehensive process that has involved most of the Division staff. Through a series of brainstorming''meetings, we have accumulated a wealth of ideas. By this process, we have been able to identify our perceived strengths and weaknesses and to propose very challenging goals for the future. Early on in our planning, we selected two distinct areas where we desire changes. First, we want to pursue program development in a much more structured and dynamic manner: deciding what we want to do, developing plans, and providing the resources to follow through. Second, we want to change the way that we do business by developing more effective ways to work together within the Division and with the important groups that we interact with throughout Energy Systems. These initiatives are reflected in the plan and in related actions that the Division is implementing. The ETD mission is to perform research, development, conceptual design, analysis, fabrication, testing, and system demonstration of technology essential for …
Date:
January 1, 1995
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Orientation selection and microstructural evolution of epitaxial platinum films on (001) magnesium oxide
Thin platinum films were deposited at several different deposition rates and with varying thickness on (001)-cut MgO single crystal substrates by electron beam evaporation. A mixture of two epitaxial Pt orientations were detected in the films by X-ray diffraction and planar ion channeling experiments: (001)[100]Pt // (001)[100]MgO (the [open quotes]cube-on-cube[close quotes] orientation) and (111)[110]Pt // (001)[110]MgO. The effect of deposition rate on film orientation indicated the (111)Pt orientation was preferred under conditions of high driving force for nucleation. The volume fraction of the films occupied by the (111) orientation increased with nominal film thickness, at a constant substrate temperature and deposition rate. This result indicates crystallites having the (111)Pt orientation grew more quickly following nucleation than the (001). The mosaic spread of the Pt orientation decreased markedly as the nominal film thickness increased from [approximately] 1.5 nm (isolated islands) to 20 nm (continuous film).
Date:
January 1, 1995
Creator:
McIntyre, P.C.; Maggiore, C.J. & Natasi, M.
Object Type:
Article
System:
The UNT Digital Library
Other approaches to civil-military integration: background paper: the Chinese and Japanese arms industries
This report is divided into two sections, one of the PRC and one on Japan. Each section describes the structure and management of the respective defense industrial base and then compares it with its U.S. counterpart. The paper then assesses the degree to which lesson from the PRC and Japanese cases can be applied to the U.S. defense technology and industrial base (DTIB).
Date:
1995
Creator:
United States. Congress. Office of Technology Assessment
Object Type:
Report
System:
The UNT Digital Library