Collection
Office of Scientific & Technical Information Technical Reports
40,235
USGS Topographic Map Collection
4,374
Texas Attorney General Opinions
2,353
Technical Report Archive and Image Library
2,261
Congressional Research Service Reports
1,552
Texas State Publications
1,160
Texas Register
399
Advisory Commission on Intergovernmental Relations
119
Office of Technology Assessment
94
Federal Communications Reports
71
15 More
Serial/Series Title
7.5 Minute Series (Topographic)
2,685
Digital Raster Graphic Topographic Maps: 7.5 Minute Series (Topographic)
1,531
GJBX
967
Atomic Energy Commission Reports
586
United States Department of Energy Grand Junction Office Reports
530
Argonne National Laboratory Reports
407
Texas Register
399
United States Geological Survey Reports
284
Water Resources Investigations Reports
241
U.S. Waterways Experiment Station Reports
193
446 More
Degree Discipline
Country
States
Decade
Year
Month
Language
52,814 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
52,814
next
Advanced on-board electric vehicle charger. Final report
The design and development of an on-board charger power module for use in electric vehicles is described. The module operates at 20KHz in a series resonant, half bridge configuration. Circuit design trade-offs, module performance, and solutions to the problems of acoustic noise, maintaining high power factor, circuit protection and operating reliability are discussed. The power module operates from a single phase, 240 V, 50/60 Hz utility line. Average power factor is 0.90; efficiency at maximum power output is 86%. The module is rated to charge a bank consisting of 20 Exide EV-106 batteries (60 cells) to an end voltage of 2.42 V/cell. Physically, the module weighs less than 17 Kg. Projected manufacturing cost at the thousand unit level is $394.00 (1978 dollars).
Date:
December 31, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Conversion of associated natural gas to liquid hydrocarbons
Energy International is a leader in catalyst and process development as it relates to Fischer-Tropsch (F-T) technology. Through this activity, a concept evolved for a new technique for capturing the fuel value in the associated natural gas contained in crude oil. In the new concept, the dissolved natural gas would be processed via F-T technology to produce light hydrocarbons that would then, in one manifestation of this concept, be redissolved in the crude oil to produce a lighter crude than the original, containing all of the natural gas, but with the vapor pressure of the crude lowered to an acceptable level via the conversion process. This technique would be of particular interest in those instances where the alternative methods of collections and utilizing the associated natural gas were expensive. A study of the application of this technology was undertaken by EI with support from the DOE.
Date:
December 31, 1979
Creator:
Singleton, A.H., Cooper, P.G.
Object Type:
Article
System:
The UNT Digital Library
Development of Geothermal Binary Cycle Working Fluid Properties Information and Analysis of Cycles
The research discussed in this report was performed at the University of Oklahoma during the period January 1, 1979 through December 31, 1979. Efforts were directed principally to the following tasks: (1) comparisons of mixture and pure fluid cascade cycles, (2) development of guidelines for working fluid selection for single boiler cycles, (3) continued evaluation of mixtures as working fluids, (4) working fluid thermophysical property correlation and presentations of properties information.
Date:
December 31, 1979
Creator:
Starling, Kenneth E.; Iqbal, K.Z.; Malik, Z.I.; Chu, C.T.; Ramaswamy, S.; Kumar, K.H. et al.
Object Type:
Report
System:
The UNT Digital Library
Development of high efficiency cascade solar cells. Quarterly technical progress report No. 2
Research has continued in the development of selected ternary and quaternary III-V materials that are potential candidates for cascade solar cell applications. In addition, various simple and multi-junction cascade solar cell components have been fabricated and evaluated in a continuing study of several different solar cell designs (materials combinations). During the present reporting period, work has concentrated on the following major areas: GaAlAs/GaAs cell development; AlGaAsSb/GaAsSb materials development; GaInP materials development via VPE; inverted structure development; and MO/CVD growth system work at NCSU. Progress in each of these areas is summarized.
Date:
December 31, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Development of superior liquid coolants CCF-1. Final technical report, 1 September 1978-31 December 1979
A comprehensive study of four representative commercially available heat transfer fluids being used in solar systems was undertaken to establish the most cost effective fluid over the life of the system. Criteria for making the assessment were the relative results of fluid toxicity tests, fire hazards tests, collector stagnation tests, and physical property comparison data of various fluids. The specific fluids evaluated were Dow Corning SylthermTM 444 silicone, Uniroyal PAO-LV polyalphaolefin hydrocarbon, Union Carbide Prestone II ethylene glycol/water solution and Dow Chemical Ambitrol NTC propylene glycol/water solution. Although there is no essential difference in the installed cost when comparing solar systems based on each of these fluids, there is a very large cost difference between the systems when life cycle costing is performed on the systems. The system representing propylene glycol/water is by far the most costly system followed by the system representing ethylene glycol/water due to possible failures and maintenance schedules. The Uniroyal PAO-LV polyalphaolefin system is the third most expensive system. The SylthermTM 444 silicone system is the least expensive, offering little or no potential for catastrophic failure and does not require any fluid maintenance.
Date:
December 31, 1979
Creator:
Hodges, R M
Object Type:
Report
System:
The UNT Digital Library
Direct utilization of geothermal heat in cascade application to aquaculture and greenhouse systems at Navarro College. Annual report, March 1, 1979-December 31, 1979
Progress is reported on a project to use the 130/sup 0/F geothermal resource in central Texas. Potential uses include geothermal space heating, aquaculture, agricultural heating, and crop drying.
Date:
December 31, 1979
Creator:
Smith, K.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of tuff as a waste isolation medium
Tuff is of interest for use as an isolation medium for high heat producing wastes because it provides highly sorptive minerals and suitable thermomechanical properties. Also, tuff is widespread in areas that offer long and deep groundwater flow paths. The occurrence and geologic/hydrologic setting of tuff are discussed. The properties of the rock are discussed and compared with other isolation media. The favorable and unfavorable aspects are presented. Also, unresolved issues are discussed along with the investigative program for addressing these issues.
Date:
December 31, 1979
Creator:
Tyler, L. D.
Object Type:
Article
System:
The UNT Digital Library
[Experimental and theoretical plasma physics program]. Technical progress in FY 1979
This report summarizes recent technical progress in the major areas of study. Because a considerable variety of work has been performed this year they authors first give brief synopses of individual research projects categorizing them as to their relevance to the general areas of plasma stability analyses, plasma heating or basic plasma physics. Next, they discuss these projects as they relate to and support the various DOE experimental programs. The DOE experimental programs are: (1) toroidal confinement systems; (2) open confinement systems; and (3) alternative concepts (EBT, Spheromak, field reversed mirrors and punches).
Date:
December 31, 1979
Creator:
Griem, H.
Object Type:
Report
System:
The UNT Digital Library
Flux pinning and flux flow studies in superconductors using flux flow noise techniques. Progress report, April 1-December 30, 1979
Flux flow noise power spectra were investigated, and information obtained through such spectra is applied to describe flux flow and pinning in situations where volume pinning force data is also available. In one case, the application of noise data to PB/sub 80/In/sub 20/ samples after recovery and after high temperature annealing is discussed. This work is consistent with a recent model for flux flow noise generation. In the second case we discuss experiments designed to change the fluxoid transit path length, which according to the model should affect both the noise amplitude and the parameter ..cap alpha.. specifying the longest subpulse times in terms of the average transit time, tau/sub c/. Transient flux flow voltages when a current is switched on after field cycling a Pb/sub 60/In/sub 40/ sample have been discovered. Noise spectra have been measured during the transient. These observations are discussed along with a simple model which fits the data. A surprising result is that the transient decay times increase with the applied current. Other characteristics of Pb/sub 60/In/sub 40/ after cold working are also discussed.
Date:
December 31, 1979
Creator:
Joiner, W.C.H.
Object Type:
Report
System:
The UNT Digital Library
[Hot Springs Quadrangle: Sediment Site Data]
Data gathered at stream sediment sites in the Hot Springs quadrangle, including applicable water chemistry measurements (e.g., pH, conductivity, alkalinity) and elemental analyses.
Date:
December 31, 1979
Creator:
National Uranium Resource Evaluation Program
Object Type:
Dataset
System:
The UNT Digital Library
Hydrogeochemical and Stream Sediment Reconnaissance Basic Data for Hot Springs NTMS Quadrangle, South Dakota
The following report provides results from a geochemical survey for the Hot Springs quadrangle, South Dakota. Field and laboratory data are presented for 340 groundwater and 394 stream sediment samples.
Date:
December 31, 1979
Creator:
National Uranium Resource Evaluation Program
Object Type:
Report
System:
The UNT Digital Library
The in-plant evaluation of a uranium NDA system
The Los Alamos Scientific Laboratory has an unirradiated enriched uranium reprocessing facility. Various types of solutions are generated in this facility, including distillates and raffinates containing ppm of uranium and concentrated solutions with up to 400 grams U/t. In addition to uranyl nitrate and HNO{sub 3}, the solutions may also contain zirconium, niobium, fluoride, and small amounts of many metals. A uranium solution assay system (USAS) has been installed to allow accurate and more timely process control, accountability, and criticality data to be obtained. The USAS assays are made by a variety of techniques that depend upon state-of-the-art high-resolution Ge(Li) gamma-ray spectroscopy integrated with an interactive, user-oriented computer software package. Tight control of the system`s performance is maintained by constantly monitoring the USAS status. Daily measurement control sequences are required, and the user is forced by the software to perform these sequences. Routine assays require 400 or 1000 seconds for a precision of 0.5% over the concentration range of 5--400 g/t. A comparison of the USAS precision and accuracy with that obtained by traditional destructive analytical chemistry techniques (colorimetric and volumetric) is presented.
Date:
December 31, 1979
Creator:
Sprinkle, J. K. Jr.; Baxman, H. R.; Langner, D. G.; Canada, T. R. & Sampson, T. E.
Object Type:
Article
System:
The UNT Digital Library
Inertial Confinement Fusion Program. Progress report FY 1979
The first phase of an experimental program designed to accelerator a planar target to implosion level velocities was completed. Some results on ablation physics, the hydrodynamic stability limit, and the associated laser-plasma coupling physics are also included.
Date:
December 31, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Interaction of radionuclides with geomedia from the Nevada Test Site
Aqueous/solid distribution coefficients have been measured for {sup 137}Cs, {sup 85}Sr, {sup 99}Tc, {sup 152}Eu, {sup 144}Ce, {sup 238}Pu, {sup 243}Am and {sup 244}Cm on powdered argillite and hornfels obtained from the Nevada Test Site. The fluid phases included a groundwater simulant and deionized water preequilibrated with powdered argillite. Distribution coefficients for lanthanides and actinides are generally high and Eleana shale was found to effectively sorb technetium.
Date:
December 31, 1979
Creator:
Lynch, A.W. & Dosch, R.G.
Object Type:
Article
System:
The UNT Digital Library
Linear-motor drives for machine tools
Conventional techniques to position moving platforms on precision machines have relied heavily on mechanical drives such as the ball-nut/lead-screw system. Unfortunately, as positioning tolerances become more and more demanding, the cyclic errors-inherent even in precision gear drives-contribute an excessive amount of positioning uncertainty. The linear-motor drive system is one approach to provide a smooth, accurate, vibration-free method for locating a moving platform. Some existing uses of linear motors in industry as well as potential future applications on precision machines are discussed.
Date:
December 31, 1979
Creator:
Barkman, W.E.
Object Type:
Report
System:
The UNT Digital Library
Mechanical modeling of nuclear waste disposal in argillite at the Nevada Test Site
Numerical calculations for a near surface heater experiment in argillite conducted at the Nevada Test Site were performed using the finite element code ADINA assuming a two-dimensional axisymmetric geometry. The existence and extent of the region of tensional opening of joints surrounding the heater, predicted by the mechanical model, were confirmed by posttest borehole inspection, permeability measurements, and drillback. Exrapolation of near surface heater model to repository depths reveals the necessity for prior knowledge of the mechanical properties and state of stress in-situ. The extent of the joint opening zone, for example, is not altered by changes in the elastic modulus at the near surface, but is significantly decreased beyond certain depths depending upon the in-situ elastic modulus. Results of these calculations are presented. To further define the behavior at depth, and place bounds on the joint opening zone, far-field calculations were performed for a generic repository in argillite. Both spent fuel and high level waste heat sources were considered at different burial densities and depths. Results of a parametric study are presented in which the mechanical properties, in-situ stresses, and waste heat sources were varied.
Date:
December 31, 1979
Creator:
Thomas, R. K. & Lappin, A. R.
Object Type:
Article
System:
The UNT Digital Library
Model development for in situ test results in argillaceous rock
Near-surface heater tests have been conducted in two different geologic settings for argillaceous rocks. The results of these tests have provided the in situ data necessary to develop the thermomechanical models for predicting the response of argillaceous rock to thermal load representative of high-level nuclear waste.
Date:
December 31, 1979
Creator:
Tyler, L. D.
Object Type:
Report
System:
The UNT Digital Library
Mound Facility. 1978 annual report
For Mound Facility, the year 1978 was one of progress marked by enhanced mission assignments and significant milestones. The thirtieth anniversary of the site was celebrated, and Monsanto Research Corporation began a new 5 year contract to operate the Mound Facility. Long-standing production assignments were strengthened, and were were given a new responsibility: to develop and produce all ceramic parts used in Mound-build products. progress toward US energy objectives was bolstered by Mound programs supporting the development of nuclear fusion poser, unlocking previously us attainable fossil fuels, ensuring the safety and security of nuclear material handling operations, and exploring the real promise of energy form the sun. In 1978, we focused our attention on many efforts aimed at a brighter, more secure future.
Date:
December 31, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
NTS Terminal Waste Storage Project. Annual report, FY 1978 (should have been 1979)
The primary thrust of the NTS Terminal Waste Storage Project during FY 1978 was to continue an evaluation of the suitability of the Nevada Test Site (NTS) for siting a commercial spent fuel or high-level waste repository. At the beginning of the year, three primary issues were identified. They are: (1) is waste isolation at the NTS compatible with weapons testing; (2) are there suitable geohydrologic settings available on the NTS; and (3) are there suitable disposal media available at NTS. The NTS Terminal Waste Storage Project has been organized primarily to address these three issues. The southwestern area of the NTS has been identified as compatible with both current and future weapons testing. The NTS and adjacent areas of southern Nevada contain media which are probably suitable for waste isolation and which occur in a region characterized by long groundwater flow paths through sorptive media. However, utilization of the southwestern part of NTS requires that several geotechnical issues be addressed intensively. These are: (1) the potential for earthquakes at and near NTS; (2) the potential for future volcanism at possible repository sites; (3) the location and nature of faults; and (4) the characterization of the groundwater flow system from …
Date:
December 31, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Parameters affecting radionuclide migration in geologic media
Adsorption of several nuclides (Sr, Tc, Cs, Ba, Ce, Eu) on tuff, monzonite, and argillite was studied experimentally. 3 tables. (DLC)
Date:
December 31, 1979
Creator:
Erdal, B.R.; Bayhurst, B.P. & Daniels, W.R.
Object Type:
Article
System:
The UNT Digital Library
Performance analyses of Elmo Bumpy Torus plasmas and plasma support systems
The development and applcation of the OASIS Code (Operational Analysis of ELMO Bumpy Torus Support and Ignition Systems) for the study of EBT device and plasma performance are presented. The code performs a time-independent, zero-dimensional self-consistent calculation of plasma and plasmasupport systems parameters for the physics and engineering of EBT devices. The features of OASIS modeling for the EBT plasma include: (1) particle balance of the bulk toroidal and electron ring plasma components for experimental (H-H, D-D, He-He etc.) as well as reactor (D-T) devices; (2) energy balance in the bulk and ring plasmas for externally heated or ignition devices; (3) alpha particle effects for reactor devices; (4) auxiliary heating effects, including microwave (ECRH), RF heating (e.g., ICRH), and neutral beam methods; and (5) ignition conditions, including fusion power, alpha power and neutron wall loading. The performance studies using OASIS focussed on variation in plasma and device size and on microwave input power and frequency. An additional study was performed to determine the characteristics of an EBT reactor proof-of-principle device operated with a deuterium-tritium plasma. Sensitivity studies were performed for variation in the input microwave power sharing fractions and the dependence of the bulk n tau scaling law on bulk …
Date:
December 31, 1979
Creator:
Fenstermacher, M. E.
Object Type:
Report
System:
The UNT Digital Library
Petrology of tuff units from the J-13 drill site, Jackass Flats, Nevada
The J-13 drill hole, located in Jackass Flats, Nevada Test Site, has penetrated 125 m of alluvium and 932 m of tuff. Most of the tuff deposits consist of welded tuffs; glass phases in the tuffs have been replaced by authigenic minerals, mainly K-feldspar, silica, and zeolites. The zonation of authigenic minerals, with depth, indictes that alteration of glass phases and filling of vugs occurred during welding and compaction of tuff units soon after deposition and by interaction with groundwater. Zonation of authigenic minerals in tuff deposits at Jackass Flats is similar to mineral zonation in tuffs elsewhere at the Nevada Test Site and in tuff deposits of west Texas. All appear to have been developed by leaching of glass phases and deposition of authigenic minerals in open hydrologic systems. 10 figures, 38 tables.
Date:
December 31, 1979
Creator:
Heiken, G. H. & Bevier, M. L.
Object Type:
Report
System:
The UNT Digital Library
Preliminary market analysis for customer side of the meter thermal-energy storage
An examination is made of the potential market size for thermal energy storage space heating, water heating, and air conditioning in the residential and commercial sector. It is concluded that a significant market for TES could develop over the next 20 years; the analysis considers the electric utility perspective, the perspective, and the expected market in detail. (MCW)
Date:
December 31, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Projection of Favorable Gas-Producting Areas From Paleoenvironmental Data
Paleoenvironmental biofacies analysis of recent wells in dark Devonian shales in the Applachian Basin has shown that these facies can be projected to areas with no control points. In particular, the facies distribution in Perry County, Kentucky, were found to be precisely those that were predicted earlier from biofacies and organic geochemical data from the VA-1 well in Wise County, Virginia, and the KY-2 well in Martin County, Kentucky. This demonstrates the importance of these data in assessing the volume of gas in the shale throughout the basin as well as in selecting future test sites. The recent biofacies and geochemical work together with a review of the tectonics of the basin have contributed to an evolving interpretation of the geologic control of the biofacies. While a marine environment persisted throughout the Upper Devonian over the Applachian and Illinois Basin (and probably the Michigan Basin), dynamic emergent areas controlled an intermittent introduction of large amounts of organic matter. Large amounts of non-marine organic matter were periodically transported in the basin from a dynamic source province to the Southeast; massive "blooms" of Tasmanites intermittently spread both east and west from the edges of the emerging Cincinnati Arch. At times one or …
Date:
December 31, 1979
Creator:
Zielinski, R.E.; Dixon, J. A.; McIver, R. D. & Reaugh, A. B.
Object Type:
Report
System:
The UNT Digital Library