Collection
Office of Scientific & Technical Information Technical Reports
5,946
Technical Report Archive and Image Library
961
USGS Topographic Map Collection
546
Texas State Publications
264
Texas Attorney General Opinions
130
Texas Register
100
Congressional Research Service Reports
60
Office of Technology Assessment
39
Texas Soil Surveys
25
Advisory Commission on Intergovernmental Relations
19
10 More
Serial/Series Title
GJBX
681
United States Department of Energy Grand Junction Office Reports
608
Digital Raster Graphic Topographic Maps: 7.5 Minute Series (Topographic)
309
7.5 Minute Series (Topographic)
233
Biological services program FWS/OBS
105
United States Fish and Wildlife Service Maps
101
Texas Register
100
Atomic Energy Commission Reports
94
Argonne National Laboratory Reports
51
Texas Turkey Poults
43
160 More
Country
States
Year
Month
Language
8,119 Matching Results
Results open in a new window/tab.
[Kenora Quadrangle: Average Record Data Listings]
Average record data listings taken during aerial gamma-ray and magnetic surveys of the Kenora quadrangle in Minnesota.
Date:
March 1981
Creator:
Aero Service (Firm)
Object Type:
Dataset
System:
The UNT Digital Library
[Kenora Quadrangle: Single Record Data Listings]
Single record data listings taken during aerial gamma-ray and magnetic surveys of the Kenora quadrangle in Minnesota.
Date:
March 1981
Creator:
Aero Service (Firm)
Object Type:
Dataset
System:
The UNT Digital Library
[Quetico Quadrangle: Average Record Data Listings]
Average record data listings taken during aerial gamma-ray and magnetic surveys of the Quetico quadrangle in Minnesota.
Date:
April 1981
Creator:
Aero Service (Firm)
Object Type:
Dataset
System:
The UNT Digital Library
[Quetico Quadrangle: Single Record Data Listings]
Single record data listings taken during aerial gamma-ray and magnetic surveys of the Quetico quadrangle in Minnesota.
Date:
April 1981
Creator:
Aero Service (Firm)
Object Type:
Dataset
System:
The UNT Digital Library
[Roseau Quadrangle: Average Record Data Listings]
Average record data listings taken during aerial gamma-ray and magnetic surveys of the Roseau quadrangle in Minnesota.
Date:
April 1981
Creator:
Aero Service (Firm)
Object Type:
Dataset
System:
The UNT Digital Library
[Roseau Quadrangle: Single Record Data Listings]
Single record data listings taken during aerial gamma-ray and magnetic surveys of the Roseau quadrangle in Minnesota.
Date:
April 1981
Creator:
Aero Service (Firm)
Object Type:
Dataset
System:
The UNT Digital Library
Pricetown I Underground Coal Gasification Field Test: Operations Report
An Underground Coal Gasification (UCG) field test in bituminous coal was successfully completed near Pricetown, West Virginia. The primary objective of this field test was to determine the viability of the linked vertical well (LVV) technology to recover the 900 foot deep, 6 foot thick coal seam. A methane rich product gas with an average heating value of approximately 250 Btu/SCF was produced at low air injection flow rates during the reverse combustion linkage phase. Heating value of the gas produced during the linkage enhancement phase was 221 Btu/SCF with air injection. The high methane formation has been attributed to the thermal and hydrocracking of tars and oils along with hydropyrolysis and hydrogasification of coal char. The high heating value of the gas was the combined effect of residence time, flow pattern, injection flow rate, injection pressure, and back pressure. During the gasification phase, a gas with an average heating value of 125 Btu/SCF was produced with only air injection, which resulted in an average energy production of 362 MMBtu/day.
Date:
1981~
Creator:
Agarwal, A. K.; Seabaugh, P. W. & Zielinski, R. E.
Object Type:
Report
System:
The UNT Digital Library
Nonequilibrium flashing model for rapid pressure transients. [PWR]
A detailed, microscopic model for the nonequilibrium flashing of water is coupled to equations describing the bulk liquid state in order to calculate rapid pressure response to an induced liquid strain. The flashing model is predicated on the dynamics of a single bubble growing in an infinite liquid, and it encompasses both the inertia and conduction-limited regimes of bubble growth. The analysis is valid at high temperatures. It is not limited by the assumption of a thin thermal boundary layer for the bubble or by a prescribed boundary layer shape. The analysis can predict arbitrary pressure transients, both decompressive and recompressive. The flashing model involves the solution of a system of ordinary and partial differential equations constituting a classic moving-boundary problem. The solution is obtained numerically by the method of lines and by the use of automatic software.
Date:
January 1, 1981
Creator:
Aguilar, F. & Thompson, S.
Object Type:
Article
System:
The UNT Digital Library
Geothermal Well Completions in Cerro Prieto
Geothermal well completion criteria have evolved from 1964 to this date. The evolution started with the common techniques used in oil-well completion and gradually changed to accommodate the parameters directly related to the mineralogic characteristics of the geothermal fluids. While acceptable completions can now be achieved, research techniques and data collection should be improved to optimize the procedures.
Date:
January 1, 1981
Creator:
Aguirre, B. D & Rivera, J. M. C.
Object Type:
Article
System:
The UNT Digital Library
Geothermal Well Maintenance and Repair in Cerro Prieto
When the first well is drilled at a geothermal field, procedures for the cleaning, repair, and control of wells should be established. This aspect will be increasingly important as more wells are drilled. Equipment, tools and techniques need to be improved to achieve economic and safe results. Different systems have been developed and applied in maintenance of wells, in problems of casing incrustations, repairs, plugging, and well control. These systems should be improved, even though they have been reasonably satisfactory to date.
Date:
January 1, 1981
Creator:
Aguirre, B. D. & Blanco, F. V.
Object Type:
Article
System:
The UNT Digital Library
Geothermal Drilling in Cerro Prieto
To date, 71 geothermal wells have been drilled in Cerro Prieto. The activity has been divided into several stages, and, in each stage, attempts have been made to correct deficiencies that were gradually detected. Some of these problems have been solved; others, such as those pertaining to well casing, cement, and cementing jobs, have persisted. The procedures for well completion--the most important aspect for the success of a well--that were based on conventional oil well criteria have been improved to meet the conditions of the geothermal reservoir. Several technical aspects that have improved should be further optimized, even though the resolutions are considered to be reasonably satisfactory. Particular attention has been given to the development of a high-temperature drilling fluid capable of being used in drilling through lost circulation zones. Conventional oil well drilling techniques have been used except where hole-sloughing is a problem. Sulfonate lignitic mud systems have been used with good results. When temperatures exceed 300 C (572 F), it has been necessary to use an organic polymer to stabilize the mud properties.
Date:
January 1, 1981
Creator:
Aguirre, B. D. & Garcia, G. S.
Object Type:
Article
System:
The UNT Digital Library
Laser fusion monthly, February 1981
This report is divided into the following sections: (1) facility reports (Argus and Shiva); (2) Nova project; and (3) fusion experiments. In the Fusion Experiments section of this report, the author describes the results of a series of experiments on Shiva which further the understanding of the production and transport of suprathermal electrons. He found that of the suprathermal electrons which strike a laser irradiated disk target or which interact with the rear surface of a half Cairn hohlraum target, a significant fraction of these electrons orbit the target and strike the rear of the disk. These results have significant implications in the interpretation and modeling of the laser irradiated target experiments.
Date:
February 1, 1981
Creator:
Ahlstrom, H.G.
Object Type:
Report
System:
The UNT Digital Library
Solar coal-gasification reactor with pyrolysis-gas recycle. [Patent application]
Coal (or other carbonaceous matter, such as biomass) is converted into a product gas that is substantially free from hydrocarbons. The coal is fed into a solar reactor, and solar energy is directed into the reactor onto coal char, creating a gasification front and a pyrolysis front. A gasification zone is produced well above the coal level within the reactor. A pyrolysis zone is produced immediately above the coal level. Steam, injected into the reactor adjacent to the gasification zone, reacts with char to generate product gases. Solar energy supplies the energy for the endothermic steam-char reaction. The hot product gases flow from the gasification zone to the pyrolysis zone to generate hot char. Gases are withdrawn from the pyrolysis zone and reinjected into the region of the reactor adjacent the gasification zone. This eliminates hydrocarbons in the gas by steam reformation on the hot char. The product gas is withdrawn from a region of the reactor between the gasification zone and the pyrolysis zone. The product gas will be free of tar and other hydrocarbons, and thus be suitable for use in many processes.
Date:
April 6, 1981
Creator:
Aiman, W.R. & Gregg, D.W.
Object Type:
Patent
System:
The UNT Digital Library
Cataract production in mice by heavy charged particles
The cataractogenic effects of heavy charged particles have been evaluated in mice in relation to dose and ionization density (LET/sub infinity/). The study was undertaken due to the high potential for eye exposures to HZE particles among SPS personnel working in outer space. This has made it imperative that the relative biological effectiveness (RBE) in relation to LET/sub infinity/ for various particles be defined so that appropriate quality factors (Q) could be assigned for estimation of risk. Although mice and men differ in susceptibility to radiation-induced cataracts, the results from this project should assist in defining appropriate quality factors in relation to LET/sub infinity/, particle mass, charge, or velocity. Evaluation of results indicated that : (1) low single doses (5 to 20 rad) of iron (/sup 56/Fe) or argon (/sup 40/Ar) particles are cataractogenic at 11 to 18 months after irradiation; (2) onset and density of the opacification are dose related; (3) cataract density (grade) at 9, 11, 13, and 16 months after irradiation shows partial LET/sub infinity/-dependence; and (4) the severity of cataracts is reduced significantly when 417 rad of /sup 60/Co gamma radiation is given in 24 weekly 17 rad fractions compared to giving this radiation as a …
Date:
March 1, 1981
Creator:
Ainsworth, E.H.; Jose, J.; Yang, V.V. & Barker, M.E.
Object Type:
Report
System:
The UNT Digital Library
Seismological investigation of crack formation in hydraulic rock fracturing experiments and in natural geothermal environments. Progress report, September 1, 1980-August 31, 1981
Progress is reported on the following: interpretation of seismic data from hydraulic fracturing experiments at the Fenton Hill Hot Dry Rock Geothermal Site, interpretation of 3-D velocity anomalies in the western US with special attention to geothermal areas, theoretical and observational studies of scattering and attenuation of high-frequency seismic waves, theoretical and observational studies of volcanic tremors in relation to magma transport mechanisms, and deployment and maintenance of 9 event-recorders around Mt. St. Helens. Abstracts of papers submitted for publication are included. (MHR)
Date:
September 1, 1981
Creator:
Aki, K.
Object Type:
Report
System:
The UNT Digital Library
Performance study of a thermal-envelope house: Phase II. Cooling performance. Final report
The thermal envelope house is shown to perform much better than conventional houses without mechanical refrigeration and better than one would expect from most passively cooled houses in the hot-humid climate of Georgia. Peak temperatures inside the house were 8 to 15/sup 0/F below peak ambient temperatures. Peak inside temperature measured during the test period was 80/sup 0/F with an outside ambient peak of 93/sup 0/F. Air flow rates within the envelope were less than 1 ft/sec even when the attic fan was operating. The earth cooling tubes provided noticeable sensible cooling to the house. Exit temperatures from the cooling tubes were between 72 to 76/sup 0/F, depending upon the air velocity through the tubes. The thermal chimney performed poorly as an air mover, especially when used to induce flow through the earth cooling tubes. The performance of the earth cooling tube could be improved by using the attic fan to increase the air flow through the cooling tubes and to insure it flowed in the cooling tube, through the envelope and out the thermal chimney. Being an exhaust fan, the attic fan created a negative pressure in the house. While this increased air flow through the cooling tubes, it …
Date:
January 1, 1981
Creator:
Akridge, J. M. & Benton, C. C.
Object Type:
Report
System:
The UNT Digital Library
Framework for Evaluating the Effectiveness of Nuclear-Safeguards Systems. [Aggregated Systems Model (ASM)]
This paper describes an analytical tool for evaluating the effectiveness of safeguards that protect special nuclear material (SNM). The tool quantifies the effectiveness using several measures, including probabilities and expected times to detect and respond to malevolent attempts against the facility. These measures are computed for a spectrum of threats involving outsiders, insiders, collusion, falsification, and deceit. Overall system effectiveness is judged using performance indices aggregated over all threats. These indices can be used by designers and regulators when comparing costs and benefits of various safeguards. The framework is demonstrated with an example in which we assess vulnerabilities of a safeguards system and identify cost-effective design modifications.
Date:
October 20, 1981
Creator:
Al-Ayat, R. A. & Judd, B. R.
Object Type:
Article
System:
The UNT Digital Library
AACOG Region, Volume 8, Number 4, June 1981
Monthly newsletter of the Alamo Area Council of Governments describing news and events of relevance to the agencies.
Date:
June 1981
Creator:
Alamo Area Council of Governments
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Regional cerebral glucose metabolism in aging and senile dementia as determined by 18F-deoxyglucose and positron emission tomography
The use of positron emission tomography in the evaluation of aging and senile dementia is discussed.
Date:
January 1, 1981
Creator:
Alavi, A.; Reivich, M. & Ferris, S.
Object Type:
Article
System:
The UNT Digital Library
Mapping of functional activity in brain with /sup 18/F-fluoro-deoxyglucose
A model has been designed based on the assumptions of a steady state for glucose consumption, a first-order equilibration of the free /sup 14/C-DG pool in the tissue with the plasma level, and relative rates of phosphorylation of /sup 14/C-DG and glucose determined by their kinetic constants for hexokinase reaction. Using an operational equation based on this model, the metabolic rates of glucose are calculated in various regions of brain (utilizing brain slices and autoradiography). /sup 14/C is a beta emitter and therefore not suitable for noninvasive imaging in man. With the synthesis of /sup 18/F-2-deoxy-2-fluoro-D-glucose (/sup 18/F-DG) all of the requirements for a suitable radiopharmaceutical for the determination of local cerebral metabolism have been met. This agent behaves very similarly to /sup 14/C-DG and therefore, using the above described model and emission tomography, it has become possible to measure regional cerebral metabolism for the first time in man.
Date:
January 1, 1981
Creator:
Alavi, A.; Reivich, M.; Greenberg, J. & Wolf, A.
Object Type:
Article
System:
The UNT Digital Library
Data acquisition and experiment control system for high-data-rate experiments at the National Synchrotron Light Source
A data acquisition and experiment control system for experiments at the Biology Small-Angle X-ray Scattering Station at the National Synchrotron Light Source has been developed based on a multiprocessor, functionally distributed architecture. The system controls an x-ray monochromator and spectrometer and acquires data from any one of three position-sensitive x-ray detectors. The average data rate from the position-sensitive detector is approx. 10/sup 6/ events/sec. Data is stored in a one megaword histogramming memory. The experiments at this Station require that x-ray diffraction patterns be correlated with timed stimuli at the sample. Therefore, depending on which detector is in use, up to 10/sup 3/ time-correlated diffraction patterns may be held in the system memory simultaneously. The operation of the system is functionally distributed over four processors communicating via a multiport memory.
Date:
November 1, 1981
Creator:
Alberi, J.L. & Stubblefield, F.W.
Object Type:
Article
System:
The UNT Digital Library
Brillouin-Zone Integration Schemes: An Efficiency Study for the Phonon Frequency Moments of the Harmonic, Solid, One-Component Plasma
The efficiency of four different Brillouin-zone integration schemes including the uniform mesh, special point method, special directions method, and Holas method are compared for calculating moments of the harmonic phonon frequencies of the solid one-component plasma. Very accurate values for the moments are also presented. The Holas method for which weights and integration points can easily be generated has roughly the same efficiency as the special directions method, which is much superior to the uniform mesh and special point methods for this problem.
Date:
January 1, 1981
Creator:
Albers, R. C. & Gubernatis, J. E.
Object Type:
Report
System:
The UNT Digital Library
15 Mile Road/Edison Corridor Sewer Tunnel Failure Study, Detroit Area, Michigan
Partial abstract: "The study consisted of field and laboratory investigations, construction evaluation, and geotechnical and structural analyses to determine the cause(s) of distress and failure of a 2600-ft section of 12-ft 9-in. diameter concrete-lined sanitary sewer tunnel in the Detroit, Mich., area. [...] The report includes summaries of all pertinent construction records, results of all pertinent past and current field and laboratory tests on construction and geotechnical materials, and detailed geotechnical and structural analyses based on observed conditions and measured parameters."
Date:
January 1981
Creator:
Albert, Dick; Hoff, George C.; Lorence, Brian; Mitchell, Gerald B.; Mlakar, Paul F.; Murphy, William L. et al.
Object Type:
Report
System:
The UNT Digital Library
Microseismic activity observed during depressurization of an oil storage cavern in rock salt
In November 1978, the Los Alamos National Laboratory installed a triaxial downhole geophone package at the Bryan Mound Strategic Petroleum Reserve, a salt dome near Freeport, Texas. Monitoring was for the purpose of detecting microseismic activity during the depressurization of one of the oil storage caverns. Seismic activity started soon after the start of depressurization, reached a peak 5 days later, and rapidly died off. Nineteen locatable microearthquakes with magnitudes between -1 and -2 were observed during and after depressurization. All but two of these events were located near the side of the oil storage cavern. Because the shear-wave spectra of these events were characterized by well-defined corner frequencies we were able to calculate the radius of the rupture surface, the seismic moment, and the stress drop from the source spectra. Estimates of the source radius vary from 15 to 100 m, stress drops range from 0.3 to 0.01 bar, and seismic moments range from 3 x 10/sup 14/ to 3 x 10/sup 15/ dyne/cm. Important conclusions from this study are that comparatively small changes in the internal pressure of oil storage caverns may be enough to cause failure in the salt near the cavern walls and that downhole microseismic …
Date:
January 1, 1981
Creator:
Albright, J. & Pearson, C.
Object Type:
Article
System:
The UNT Digital Library