Collection
Office of Scientific & Technical Information Technical Reports
25,337
Texas Laws and Resolutions Archive
9,973
Congressional Research Service Reports
3,775
Defense Base Closure and Realignment Commission
2,993
Technical Report Archive and Image Library
2,590
Government Accountability Office Reports
1,567
Texas State Publications
1,512
Texas Patents
1,506
Texas Attorney General Opinions
1,238
National Advisory Committee for Aeronautics Collection
1,172
30 More
Serial/Series Title
Degree Discipline
Country
States
Decade
Year
Month
51,406 Matching Results
Results open in a new window/tab.
A Hybrid Hydrologic-Geophysical Inverse Technique for the Assessment and Monitoring of Leachates in the Vadose Zone
The objective of this study is to develop and field test a new, integrated Hybrid Hydrologic- Geophysical Inverse Technique (HHGIT) for characterization of the vadose zone at contaminated sites. This new approach to site characterization and monitoring can provide detailed maps of hydrogeologic heterogeneity and the extent of contamination by combining information from 3D electric resistivity tomography (ERT) and/or 2D cross-borehole ground penetrating radar (XBGPR) surveys, statistical information about heterogeneity and hydrologic processes, and sparse hydrologic data. Because the electrical conductivity and dielectric constant of the vadose zone (from the ERT and XBGPR measurements, respectively) can be correlated to the fluid saturation and/or contaminant concentration, the hydrologic and geophysical measurements are related.
Date:
June 1, 2000
Creator:
Alumbaugh, David L.; Yeh, Jim; LaBrecque, Doug & Glass, Robert J.
Object Type:
Report
System:
The UNT Digital Library
Influence Of Radiation And Multivalent Cation Additions On Phase Separation And Crystallization Of Glass
The major objectives of this proposed investigation are as follows: (1) To investigate the influence of multivalent cations on the thermodynamics and kinetics of phase separation and crystallization in simple model glasses. (2) To study the influence of a and b particle, heavy ion bombardment and g irradiation on phase separation and crystallization in simple model glasses. (3) To examine the structural changes produced by radiation just prior to the onset of phase separation and/or crystallization. (4) To develop models to explain the observed effects of multivalent cations and radiation on phase separation and crystallization. (5) To utilize the results of these experimental and modeling studies to provide guidelines for the allowed range of composition choices and processing conditions in order to avoid the formation of unwanted phases in nuclear waste disposal glasses.
Date:
June 1, 2000
Creator:
Weinberg, Michael C.; Uhlmann, Donald R. & Smith, Gary L.
Object Type:
Report
System:
The UNT Digital Library
Boltzmann-Langevin transport model for heavy-ion collisions
Heavy-ion collisions at intermediate energies exhibit catastrophic phenomena which requires descriptions based on stochastic transport models. First, the Boltzmann-Langevin model, which provides an example of such stochastic approaches, is briefly described. Then, a projection method for obtaining numerical solutions of the Boltzmann-Langevin equation is discussed. Finally, some applications of the model to heavy-ion collisions are presented.
Date:
June 1, 1994
Creator:
Ayik, S.
Object Type:
Article
System:
The UNT Digital Library
Nuclear structure models: Applications and development. Progress report, May 1, 1993--June 30, 1994
This report summarizes the progress made during the period May 1, 1993 through June 30, 1994 on Grant No. DE-FG05-92ER40694. Our calculations of M1 transition rates within rotational bands of superdeformed nuclei have been extended to 2-quasiparticle states (mainly for odd-odd nuclei) in the A {approx} 190 region. Several bands are predicted with large B(MI) values and suggest that the MI properties can give information on details of occupied single particle orbitals, alignment of some high-N particles and the residual two-body interactions at extreme deformation. Detailed calculations and comparison with UNISOR data for the low energy, low spin structure of {sup 187}Au have revealed two coexisting prolate structures built on the {pi}[h{sub 9/2} + f{sub 7/2}] configuration. This result was completely unexpected and presents strong challenges to our understanding of shape coexistence.
Date:
June 1, 1994
Creator:
Semmes, P. B.
Object Type:
Report
System:
The UNT Digital Library
Simplified simulation of Boltzmann-Langevin equation
We briefly recall the Boltzmann-Langevin model of nuclear dynamics. We then summarize recent progress in deriving approximate analytical expressions for the associated transport coefficients and describe a numerical method for simulating the stochastic evolution of the phase-space density.
Date:
June 1, 1994
Creator:
Ayik, S. & Randrup, J.
Object Type:
Article
System:
The UNT Digital Library
Research in nuclear physics. Progress report, June 1, 1991--June 30, 1992
This report discusses the following topics: electron capture decay of {sup 179}Ta; search for 17-keV neutrinos in the Internal Bremsstrahlung Spectrum of {sup 125}I; and {beta}{sup +} decay and cosmic-ray half-life of {sup 91}Nb.
Date:
June 1, 1992
Creator:
Kozub, R. L. & Hindi, M. M.
Object Type:
Report
System:
The UNT Digital Library
Monitoring and evaluation of aquatic resource health and use suitability in Tennessee Valley Authority reservoirs
TVA initiated a Reservoir Monitoring Program in 1990 with two objectives -- to evaluate the health of the reservoir ecosystem and to examine how well each reservoir meets the swimmable and fishable goals of the Clean Water Act. In 1990 reservoir health was evaluated subjectively using a weight-of-evidence approach (a reservoir was deemed healthy if most of the physical, chemical, and biological monitoring components appeared healthy). In the second year (1991) a more objective, quantitative approach was developed using information on five important indicators of reservoir health -- dissolved oxygen, chlorophyll, sediment quality, benthic macroinvertebrates, and fishes. The most recent information (1992) was evaluated with the same basic approach, modified to incorporate improvements based on comments from reviewers and additional data. Reservoirs were stratified into two groups for evaluation: run-of-the-river reservoirs and tributary storage reservoirs. Key locations are sampled in each reservoir (forebay, transition zone or midreservoir, inflow, and major embayments) for most or all of these five reservoir health indicators. For each indicator (or metric), scoring criteria have been developed that assign a score ranging from 1 to 5 representing poor to good conditions, respectively. Scores for the metrics at a location are summed and then the sums for …
Date:
June 1, 1993
Creator:
Dycus, D. L. & Meinert, D. L.
Object Type:
Report
System:
The UNT Digital Library
Chickamauga Reservoir 1992 fisheries monitoring cove rotenone results
The Tennessee Valley Authority (TVA) is required by the National Pollutant Discharge Elimination System (NPDES) Permit for Sequoyah Nuclear Plant (SQN) to conduct and report annually a nonradiological operational monitoring program to evaluate potential effects of SQN on Chickamauga Reservoir. This monitoring program was initially designed to identify potential changes in water quality and biological communities in Chickamauga Reservoir resulting from operation of SQU. Chickamauga Reservoir cove rotenone sampling has also been conducted as part of the preoperational monitoring program for Watts Bar Nuclear Plant (WBN) to evaluate the combined effects of operating two nuclear facilities on one reservoir once WBU becomes operational. The purpose of this report is to present results of cove rotenone sampling conducted on Chickamauga Reservoir in 1992.
Date:
June 1, 1993
Creator:
Kerley, B. L.
Object Type:
Report
System:
The UNT Digital Library
DISTURBANCES IN THE EGCR CORE
None
Date:
June 3, 1965
Creator:
Domer, R.G.
Object Type:
Report
System:
The UNT Digital Library
Availability and reliability improvement program
The goal of TVA's Availability Improvement Program for its fossil-fueled power plants is to increase plant availability from 79 to 83%, to reduce the forced outage rate from 10 to 7%, and to reduce the equivalent outage rate related to forced deratings from 6 to 2%. As background for this program historical data on plant availabilities, trends toward improved availability, factors which contribute to current reliability, and ongoing programs to improve fossil-fueled plant reliability are discussed. (LCL)
Date:
June 27, 1978
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
South Fork Holston River basin 1988 biomonitoring
There is concern over the effects of shifts in land use use practices on the aquatic fauna of streams in the South Fork Holston River basin in northwestern North Carolina and southwestern Virginia. Trout reproduction has noticeably declined in the Watauga River subbasin. The Watauga River and Elk River subbasins have been subjected to commercial and resort development. The Middle fork Holston River and the upper South Fork Holston River subbasins have been affected by agricultural and mining activities, respectively (Cox, 1986). To aid reclamation and management of the South Fork Holston basin, Tennessee Valley Authority (TVA) biologists conducted biomonitoring--including index of biotic integrity and macroinvertebrate sampling--on the Middle Fork Holston, South Fork Holston, Watauga, and Elk Rivers to assess cumulative impairment related to changes in habitat and pollutant loading in these subbasins. Biomonitoring can detect environmental degradation, help document problem areas, and assist in development of strategies for managing water quality. This report discusses the methods and materials and results of the biomonitoring of South Fork Holston River Basin. 13 refs., 5 figs., 12 tabs.
Date:
June 1, 1990
Creator:
Saylor, C. F. & Ahlstedt, S. A.
Object Type:
Report
System:
The UNT Digital Library
Off-Site Animal Investigation Report : Second Annual Report
Since the inauguration of the Off-Site Animal Investigation project n 1957, there has been one annual report rendered as of 30 June 1958. this is the second annual report dated as of 30 June 1959. The objectives of the project have been unchanged during the past year. These are (1) to enhance the Nevada Test Site/off-site rancher relationship through an active investigation project in their interests, and (2) to provide further information as to the status of the off-site animals in their environment, with special emphasis on their radioactive isotope uptake from fall-out. isotope uptake of the animals is being emphasized as well as the gross and microscopic histopathological examinations. Two year's existence in an area of radio-contamination where a full fission spectrum of isotopes can be found, where radiation background reading range from 1/2 mr per hour to 1 = per hour, has produced no noticeable effect on the animals.
Date:
June 30, 1959
Creator:
Farmer, Garland F.
Object Type:
Report
System:
The UNT Digital Library
Convective circulation during differential heating and cooling in the Minky Creek embayment of Guntersville Reservoir, data summary for 1991
Convective circulation patterns were examined in the Minky Creek embayment of Guntersville Reservoir, Alabama, during Mid-august to mid-October 1990 and mid-May through mid-November 1991. This report describes the results obtained during 1991. Day time heating produced a warm surface layer at all stations, while the layer was often eliminated during nighttime cooling. For much of the study period, vertical temperature stratifications was minimal except during periods of heating or cooling. During differential heating, shallow regions were aften heated to the bottom while warming was confined to surface layers at deeper locations. During differential cooling water moved from shallow regions as an underflow of cool water and was replace by a return current of warmer surface waters from deeper regions. Wind influence the temperature gradients. These results support the contention that convective circulation can potentially be very important in reservoir embayments.
Date:
June 1, 1993
Creator:
Smith, C. S.; James, W. F. & Barko, J. W.
Object Type:
Report
System:
The UNT Digital Library
Clinch River - Environmental Restoration Program (CR-ERP) study, ambient water toxicity
Clinch River - Environmental Restoration Program (CR-ERP) personnel and Tennessee Valley Authority (TVA) personnel conducted a study during the week of April 14-21, 1994, as described in the Statement of Work (SOW) document. The organisms specified for testing were larval fathead minnows, Pimephales promelas, and the daphnid, Ceriodaphnia dubia. Surface water samples were collected by TVA Field Engineering personnel from Poplar Creek Mile 4.3, Poplar Creek Mile 5.1, and Poplar Creek Mile 6.0 on April 13, 15, and 18. Samples were partitioned (split) and provided to the CR-ERP and TVA toxicology laboratories for testing. Exposure of test organisms to these samples resulted in no toxicity (survival or growth) to daphnids in undiluted samples; however, toxicity to fathead minnows (significantly reduced survival) was demonstrated in undiluted samples from Poplar Creek Miles 4.3 and 6.0 in testing conducted by TVA based on hypothesis testing of data. Daphnid reproduction was significantly less than controls in 50 percent dilutions of samples from Poplar Creek Miles 4.3 and 6.0, while no toxicity to fathead minnows was shown in diluted (50 percent) samples.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
Clinch River - Environmental Restoration Program (CR-ERP) study, ambient water toxicity
Clinch River - Environmental Restoration Program (CR-ERP) personnel and Tennessee Valley Authority (TVA) personnel conducted a study during the week of July 22-29, 1993, as described in the Statement of Work (SOW) document. The organisms specified for testing were larval fathead minnows, Pimephales promelas, and the daphnid, Ceriodaphnia dubia. Surface water samples were collected by TVA Field Engineering personnel from Clinch River Mile 19.0 and Mile 22.0 on July 21, 23, and 26. Samples were split and provided to the CR-ERP and TVA toxicology laboratories for testing. Exposure of test organisms to these samples resulted in no toxicity (survival, growth, or reproduction) to either species in testing conducted by TVA.
Date:
June 1, 1997
Creator:
Russell, C.L.
Object Type:
Report
System:
The UNT Digital Library
Task 5: TVA sediment-disturbing activities within the Watts Bar Reservoir and Melton Hill Reservoir areas of the Clinch River
The objectives of Task 5 of the Interagency Agreement No. DE-AI05-91OR22007 were to review: (1) the extent of dredging, construction, and other sediment-disturbing activities conducted by the Tennessee Valley Authority (TVA) in potentially contaminated areas of Watts Bar Reservoir, and (2) the disposition of the materials from these activities. This memorandum is the final report for Task 5. This memorandum describes major activities in the Watts Bar Reservoir and Melton Hill Reservoir areas of the Clinch River that possibly resulted in significant disturbance of potentially contaminated sediments. TVA records from the construction of Watts Bar Dam, Kingston Fossil Plant, and Melton Hill Dam were reviewed to facilitate qualitative description of the effect of these activities in disturbing potentially contaminated sediments. The critical period for these activities in disturbing contaminated sediments was during or after 1956 when the peak releases of radioactive contaminants occurred from the Oak Ridge Reservation.
Date:
June 1, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Anodonta imbecillis copper sulfate reference toxicant/food test, Clinch River - Environmental Restoration Program (CR-ERP)
Reference toxicant testing using juvenile freshwater mussels was conducted as part of the CR-ERP biomonitoring study of Clinch River sediments to assess the sensitivity of test organisms and the overall performance of the test. Tests were conducted using moderately hard synthetic water spiked with known concentrations of copper as copper sulfate. Two different foods, phytoplankton and YCT-Selenastrum (YCT-S), were tested in side by side tests to compare food quality. Toxicity testing of copper sulfate reference toxicant was conducted from July 6-15, 1993. The organisms used for testing were juvenile fresh-water mussels (Anodonta imbecillis). Results from this test showed LC{sub 50} values of 0.97 and 0.84 mg Cu/L for phytoplankton and YCT-S, respectively. Previously obtained values for phytoplankton tests are 2.02 and 1.12 mg Cu/L. Too few tests have been conducted with copper as the toxicant to determine a normal range of values. Although significant reduction in growth, compared to the phytoplankton control, was seen in all treatments, including the YCT-S Control, the consequence of this observation has not been established. Ninety-day testing of juvenile mussels exhibited large variations in growth within treatment and replicate groups.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
Clinch River - Environmental Restoration Program (CR-ERP) Study, ambient water toxicity. Final report, October 21, 1993--October 28, 1993
Clinch River - Environmental Restoration Program (CR-ERP) personnel and Tennessee Valley Authority (TVA) personnel conducted a study during the week of October 21-28, 1993, as described in the Statement of Work (SOW) document. The organisms specified for testing were larval fathead minnows, Pimephales promelas, and the daphnid, Ceriodaphnia dubia. Due to serious reproduction/embryo abortion problems with the TVA daphnid cultures, TVA conducted tests during this study period using only fathead minnows. A split sample test using daphnids only will be scheduled during 1994 as a substitute for this study period. Surface water samples were collected by TVA Field Engineering personnel from Poplar Creek Mile 2.9, Mile 4.3, and Mile 5.1 on October 20, 22, and 25. Samples were split and provided to the CR-ERP and TVA toxicology laboratories for testing. Exposure of test organisms to these samples resulted in no toxicity (survival or growth) in testing conducted by TVA.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
Clinch River - Environmental Restoration Program (CR-ERP) study, Ambient water toxicity
Clinch River - Environmental Restoration Program (CR-ERP) personnel and Tennessee Valley Authority (TVA) personnel conducted a study during the week of January 25-February 1, 1994, as described in the Statement of Work (SOW) document. The organisms specified for testing were larval fathead minnows, Pimephales promelas, and the daphnid, Ceriodaphnia dubia. Surface water samples were collected by TVA Field Engineering personnel from Clinch River Mile 9.0, Poplar Creek Mile 1.0, and Poplar Creek Mile 2.9 on January 24, 26, and 28. Samples were partitioned (split) and provided to the CR-ERP and TVA toxicology laboratories for testing. Exposure of test organisms to these samples resulted in no toxicity (survival or growth) to fathead minnows; however, toxicity to daphnids (significantly reduced reproduction) was demonstrated in undiluted samples from Poplar Creek Mile 1.0 in testing conducted by TVA based on hypothesis testing of data. Point estimation (IC{sub 25}) analysis of the data, however, showed no toxicity in PCM 1.0 samples.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
Coupling Sorption to Soil Weathering during Reactive Transport: Impacts of Mineral Transformation and Sorbate Aging on Contaminant Speciation and Mobility
The Hanford subsurface has become contaminated with highly alkaline, radioactive waste generated as a result of weapons production. The radioactive brine was stored in underground storage tanks, a number of which developed leaks and contaminated the surrounding subsurface. The high pH and ionic strength of these wastes has been predicted to accelerate the degree of soil weathering to produce new mineral phases--cancrinite and sodalite among the most abundant. Previous work has demonstrated that Cs and Sr, which along with I represent the most radioactive components in the waste, are sequestered by these neo-formed solids. The present work is aimed at assessing the stability of these neo-formed solids, with special emphasis on the degree of Cs, Sr and I release under ambient (neutral pH, low ionic strength) conditions expected to return to the Hanford area after the caustic radioactive brine waste is removed.
Date:
June 1, 2006
Creator:
Steefel, Carl I.; Thompson, Aaron & Chorover, Jon
Object Type:
Report
System:
The UNT Digital Library
Hair-Drying Apparatus.
Patent for an improved method of drying hair after washing that separates and parts the hair in numerous places to quickly and thoroughly dry the hair. The apparatus, that sits on the shoulders, also has an "improved fastener for holding the frame on the head" (lines 40-41), and the frame is collapsible.
Date:
June 18, 1918
Creator:
Moffitt, Mansfield M.
Object Type:
Patent
System:
The Portal to Texas History
Gin Compress
Patent for improvements upon the cotton gin-compress which includes driven screws with gearing to make the compress "more effective than that heretofore employed"(lines 10-11) machinery.
Date:
June 3, 1919
Creator:
Dunlap, Samuel H.
Object Type:
Patent
System:
The Portal to Texas History
Geometric Figure
Patent for a sewing pattern for spherical objects, including illustrations.
Date:
June 22, 1920
Creator:
Miller, Emma Thornton
Object Type:
Patent
System:
The Portal to Texas History
Holder for Sliding Doors and Windows
Patent for a clutch mechanism for sliding doors and windows that ensures the panel can be moved in both directions freely but will not disengage of it's own accord, including illustrations and instructions.
Date:
June 4, 1918
Creator:
Benson, Jarome F.
Object Type:
Patent
System:
The Portal to Texas History