Access
Partner
UNT Libraries Government Documents Department
1,552
UNT Libraries Special Collections
493
Oklahoma Historical Society
203
Sterling Municipal Library
28
Deaf Smith County Library
22
Calhoun County Public Library
21
UNT Libraries
17
Carl Albert Congressional Research and Studies Center
15
Abilene Christian University Library
14
Burleson Public Library
13
79 More
Collection
Office of Scientific & Technical Information Technical Reports
1,497
KXAS-NBC 5 News Collection
457
Texas Digital Newspaper Program
370
Oklahoma Digital Newspaper Program
227
Tocker Foundation Grant
172
The Oklahoma City Times
44
Texas State Publications
32
Chickasha Newspaper Collection
31
Altus Times-Democrat
30
Abilene Library Consortium
27
131 More
Country
Year
Month
Language
2,670 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
2,670
next
Strippable coating used for the TMI-2 reactor building decontamination
Strippable coating material used in the TMI-2 reactor building decontamination has been tested for Sr, Cs, and Co leachability, for radiation stability, thermal stability, and for resistance to biodegradation. It was also immersion tested in water, a water solution saturated with toluene and xylene, toluene, xylene, and liquid scintillation counting (LSC) cocktail. Leach testing resulted in all of the Cs and Co activity and most of the Sr activity being released from the coating in just a few days. Immersion resulted in swelling of the coating in all of the liquids tested. Gamma irradiation and heating of the coating did not produce any apparent physical changes in the coating to 1 x 10/sup 8/ rad and 100/sup 0/C; however, gas generation of H/sub 2/, CO, CO/sub 2/ was observed in both cases. Biodegradation of the coating occurred readily in soils as indicated by monitoring CO/sub 2/ produced from microbial respiration. These test results indicate that strippable coating radwaste would have to be stabilized to meet the requirements for Class B waste outlined in 10 CFR Part 61 and the NRC Draft Technical Position on Waste Form.
Date:
January 1, 1984
Creator:
Adams, J. W.; Dougherty, D. R. & Barletta, R. E.
Object Type:
Article
System:
The UNT Digital Library
Recent activities in the Aerosol Generation and Transport Program
General statements may be made on the behavior of single-component and multi-component aerosols in the Nuclear Safety Pilot Plant vessel. The removal processes for U/sub 3/O/sub 8/, Fe/sub 2/O/sub 3/, and U/sub 3/O/sub 8/ + Fe/sub 2/O/sub 3/ aerosols are enhanced in a steam-air atmosphere. Steam-air seems to have little effect on removal of concrete aerosol from the vessel atmosphere. A steam-air environment causes a change in aerosol shape from chain-agglomerate to basically spherical for U/sub 3/O/sub 8/, Fe/sub 2/O/sub 3/, and U/sub 3/O/sub 8/ + Fe/sub 2/O/sub 3/ aerosol; for concrete the change in aerosol shape is from chain-agglomerate to partially spherical. The mass ratio of the individual components of a multi-component aerosol seems to have an observable influence on the resultant behavior of these aerosols in steam. The enhanced rate of removal of the U/sub 3/O/sub 8/, the Fe/sub 2/O/sub 3/, and the mixed U/sub 3/O/sub 8/ + Fe/sub 2/O/sub 3/ aerosols from the atmosphere of the NSPP vessel by steam-air is probably caused by the change in aerosol shape and the condensation of steam on the aerosol surfaces combining to increase the effect of gravitational settling. The apparent lack of an effect by steam-air on the removal …
Date:
January 1, 1984
Creator:
Adams, R. E.
Object Type:
Article
System:
The UNT Digital Library
Aerosol Behavior in a Steam-Air Environment
The behavior of aerosols assumed to be characteristic of those generated during accident sequences and released into containment is being studied in the Nuclear Safety Pilot Plant (NSPP). Observation on the behavior of U/sub 3/O/sub 8/ aerosol, Fe/sub 2/O/sub 3/ aerosol, concrete aerosol, and various mixtures of these aerosols in a dry air environment and in a steam-air environment within the NSPP vessel are reported. Under dry conditions, the aerosols are agglomerated in the form of branched chains; the aerodynamic mass median diameter (AMMD) of the U/sub 3/O/sub 8/, Fe/sub 2/O/sub 3/ and mixed U/sub 3/O/sub 8/-Fe/sub 2/O/sub 3/ aerosols ranged between 1.5 and 3..mu..m while that of the concrete aerosol was about 1 ..mu..m. A steam-air environment, which would be present in LWR containment during and following an accident, causes the U/sub 3/O/sub 8/, the Fe/sub 2/O/sub 3/, and mixed U/sub 3/O/sub 8/-Fe/sub 2/O/sub 3/ aerosols to behave differently from that in a dry atmosphere; the primary effect is an enhanced rate of removal of the aerosol from the vessel atmosphere. Steam does not have a significant effect on the removal rate of a concrete aerosol. Electron microscopy showed the agglomerated U/sub 3/O/sub 8/, Fe/sub 2/O/sub 3/, and mixed …
Date:
January 1, 1984
Creator:
Adams, R. E.; Tobias, M. L. & Petrykowski, J. C.
Object Type:
Article
System:
The UNT Digital Library
Medical status of Marshallese accidentally exposed to 1954 Bravo fallout radiation: January 1980-December 1982
This report updates, for 1980 through 1982, the results of continuing medical surveillance of a Marshallese population accidentally exposed to radioactive fallout in March 1954. The originally exposed Marshallese population comprised 64 persons on Rongelap Atoll who each received, on the average, an estimated 190 rads of absorbed external gamma radiation, 18 on Ailingnae Atoll who received 110 rads, and 159 on Utirik who received 11 rads. There were, in addition, 3 persons in utero on Rongelap, 1 person in utero on Ailingnae, and 8 persons in utero on Utirik who are considered exposed. The recipients of primary medical care include exposed and comparison populations as well as a rather large number of additional beneficiaries who are seen on a humanitarian basis of practical need and resource availability. In recent years, about 1400 people have been seen annually. This report, however, deals with four clearly defined groups: the remaining individuals who were exposed to radioactive fallout on Rongelap, Ailingnae, and Utirik in 1954 (including those in utero), and a comparison population of individuals from Rongelap who were unexposed. The number of persons now in each exposure category are 51, 12, 116, and 137, respectively. 100 references, 4 figures, 5 tables. …
Date:
January 1, 1984
Creator:
Adams, W. H.; Harper, J. A.; Rittmaster, R. S.; Heotis, P. M. & Scott, W. A.
Object Type:
Report
System:
The UNT Digital Library
Estimation of Pre-Existing LWR Containment Leakage Areas for Severe Accident Conditions
We have reported our findings of the pre-existing leakage areas from the subatmospheric, atmospheric (dry and ice-condenser) PWRs and the BWRs. The subatmospheric plants employ rather tight containment and hence the pre-existing leakage areas are generally quite small (perhaps inconsequential in the progression of severe accidents). The pre-existing leakage areas for other plants are considerably larger and can have a significant impact on the progression of severe accidents. Finally, we note that the sealant degradation must be considered, since most of the seal materials may not withstand the temperatures, pressures, and the duration of their exposure, typical of severe accidents.
Date:
January 1, 1984
Creator:
Agrawal, A. K. & Hall, R. E.
Object Type:
Article
System:
The UNT Digital Library
Hydrogen induced crack growth in Grade-12 titanium
Internal hydrogen induced crack growth rates were measured in Grade-12 titanium which is a candidate material for high-level nuclear waste containers. As-received and hydrogen charged samples (5 ppM to 330 ppM hydrogen) were used for slow crack growth measurements at constant loads using a Krak Gauge. The testing temperature ranged from room temperature to 148/sup 0/C. The crack growth kinetics under low to moderate loads are linear, but this linear rate is interrupted by discrete fast crack jump segments with parabolic or cubic type kinetics. These fast jump segments are thought to be associated with the passage of the crack front through the alpha-beta interface phase or with the initial loading sequence. By measuring striation spacings on the fracture surface, most crack growth rates observed are found to be in stage II. The striations are considered to be associated with hydride fracture. The crack path is either transgranular in the alpha phase or interfacial in the alpha phase adjacent to the beta phase. For transgranular growth, crack growth rates are constant and slower than those for interfacial growth which is associated with fast crack growth through a high hydrogen concentration region. Most stage II crack growth rates depend slightly on …
Date:
January 1, 1984
Creator:
Ahn, T. M. & Lee, K. S.
Object Type:
Report
System:
The UNT Digital Library
Prediction of long term crevice corrosion and hydrogen embrittlement behavior of ASTM grade-12 titanium
Crevice corrosion and hydrogen embrittlement are potential failure modes of Grade-12 titanium high-level nuclear waste containers emplaced in rock salt repositories. A method is presented to estimate the environment domains for which immunity to these failure modes will exist for periods of hundreds of years. The estimation is based on the identification and quantification of mechanisms involved. Macroscopic concentration cell formation is responsible for crevice corrosion. The cell formation is accompanied by oxygen depletion, potential drop, anion accumulation and acidification inside the crevice. This process is quantified by simple mass balance equations which show that the immunity domain is a function of the time the container is exposed to the corrosion environment. Strain induced hydride formation is responsible for hydrogen assisted crack initiation. A simple model for slow crack growth is developed using data on growth rates measured at various temperatures. The parameters obtained in the model are used to estimate the threshold stress intensity and hydrogen solubility limit in the alloy at infinite container service time. This value gives a crack size below which container failure will not occur for a given applied stress and hydrogen concentration, and a hydrogen concentration limit at a given stress intensity. 37 references, …
Date:
January 1, 1984
Creator:
Ahn, T.M. & Jain, H.
Object Type:
Report
System:
The UNT Digital Library
Searching for quark and lepton compositeness at the SSC
We examine a variety of issues connected with searching for compositeness at the SSC. These include effects of resolution, alternative methods of looking for deviations from QCD predictions, advantages of polarized beams, and effects of compositeness on photon detection. We also consider how physics may look if the compositeness scale is as low as a few TeV. 17 refs.
Date:
January 1, 1984
Creator:
Albright, C. H.; Bars, I.; Blumenfeld, B.; Braune, K.; Dine, M.; Ferbel, T. et al.
Object Type:
Article
System:
The UNT Digital Library
Search for Horizontal Bosons at the SSC
The production process anti p p ..-->.. l/sup -/l'/sup +/ + X, where the leptons belong to two different generations and X refers to spectator jets, provides a clear signature for horizontal (generation-changing) bosons when the leptons are emitted nearly back-to-back and p/sub T//sup miss/ = 0. Cross sections and p/sub T/ distributions for each lepton are presented, and discovery limits on M/sub H/ are extracted for several different channels.
Date:
January 1, 1984
Creator:
Albright, C. H.; Deshpande, N. G.; Gunion, J. F. & Haber, H. E.
Object Type:
Article
System:
The UNT Digital Library
Caviton collapse of SRS by SBS
Particle simulations are performed to show that the ion waves resulting from Stimulated Brillouin Scatter (SBS) can trigger the collapse of the plasma waves excited by Stimulated Raman Scatter (SRS). We discuss the effect of this collapse mechanism on the hot-electron spectrum produced by the electrostatic waves. A fluid model for the coupling of the ion fluctuations to the plasma waves is formulated and we discuss the necessary condition on the SBS to induce collapse of the plasma waves produced by SRS.
Date:
January 1, 1984
Creator:
Aldrich, C.; Bezzerides, B.; DuBois, D. F. & Rose, H.
Object Type:
Article
System:
The UNT Digital Library
25. mu. A pulsed polarized H/sup -/ ion source
A Haeberli-type pulsed polarized negative hydrogen source has been brought into operation at the BNL Alternating Gradient Synchrotron. It operates reliably at beam currents sometimes as high as 25 ..mu..A and 20 keV in beam pulses of 500 ..mu..sec with approximately 75% polarization. These beam intensities are about an order of magnitude higher than the original Haeberli source built at the University of Wisconsin. This improvement is caused by the higher densities of both the atomic hydrogen beam and the cesium beam, which are the basic ingredients in the charge exchange reaction. About half the beam (10 to 15 ..mu..A) is accelerated in the 200 MeV linac and injected into the AGS. 3 references, 3 figures.
Date:
January 1, 1984
Creator:
Alessi, J.; Kponou, A. & Sluyters, T.
Object Type:
Article
System:
The UNT Digital Library
High efficiency ionizer using a hollow cathode discharge plasma
A proposal for an ionizer using a hollow cathode discharge plasma is described. Ionization is via the very high current density electron beam component in the plasma, as well as from charge exchange with plasma ions. Extraction of a He/sup +/ current corresponding to approximately 50% of the incoming atomic beam flux should be possible.
Date:
January 1, 1984
Creator:
Alessi, J.G. & Prelec, K.
Object Type:
Article
System:
The UNT Digital Library
Digraph matrix analysis applications to systems interactions
Complex events such as Three Mile Island-2, Brown's Ferry-3 and Crystal River-3 have demonstrated that previously unidentified system interdependencies can be important to safety. A major aspect of these events was dependent faults (common cause/mode failures). The term systems interactions has been introduced by the Nuclear Regulatory Commission (NRC) to identify the concepts of spatial and functional coupling of systems which can lead to system interdependencies. Spatial coupling refers to dependencies resulting from a shared environmental condition; functional coupling refers to both dependencies resulting from components shared between safety and/or support systems, and to dependencies involving human actions. The NRC is currently developing guidelines to search for and evaluate adverse systems interactions at light water reactors. One approach utilizes graph theoretical methods and is called digraph matrix analysis (DMA). This methodology has been specifically tuned to the systems interaction problem. The objective of this paper is to present results from two DMA applications and to contrast them with the results from more traditional fault tree approaches.
Date:
January 1, 1984
Creator:
Alesso, H.P.; Altenbach, T.; Lappa, D.; Kimura, C.; Sacks, I.J.; Ashmore, B.C. et al.
Object Type:
Article
System:
The UNT Digital Library
Hard hadronic collisions: extrapolation of standard effects
We study hard hadronic collisions for the proton-proton (pp) and the proton-antiproton (p anti p) option in the CERN LEP tunnel. Based on our current knowledge of hard collisions at the present CERN p anti p Collider, and with the help of quantum chromodynamics (QCD), we extrapolate to the next generation of hadron colliders with a centre-of-mass energy E/sub cm/ = 10 to 20 TeV. We estimate various signatures, trigger rates, event topologies, and associated distributions for a variety of old and new physical processes, involving prompt photons, leptons, jets, W/sup + -/ and Z bosons in the final state. We also calculate the maximum fermion and boson masses accessible at the LEP Hadron Collider. The standard QCD and electroweak processes studied here, being the main body of standard hard collisions, quantify the challenge of extracting new physics with hadron colliders. We hope that our estimates will provide a useful profile of the final states, and that our experimental physics colleagues will find this of use in the design of their detectors. 84 references.
Date:
January 1, 1984
Creator:
Ali, A.; Aurenche, P.; Baier, R.; Berger, E.; Douiri, A.; Fontannaz, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Data base for the analysis of compositional characteristics of coal seams and macerals. Part 7. Petrographic variation due to depositional setting of the lower Kittanning seam, western Pennsylvania. Final report
Detailed megascopic and microscopic petrographic analyses were conducted on samples of the Lower Kittanning seam from western Pennsylvania. Relationships were sought between the paleoenvironmental setting of the coal swamp and the vertical and lateral variability of lithotypes, maceral composition and vitrinite types. Megascopically, the four samples collected from the freshwater facies of the seam are similar in appearance and relative lithotype composition, and display no distinct vertical zonations. The sample from the marine-influenced central portion of the basin (PSOC-1340) possesses a marked vertical zonation into a bright lower zone and a dull upper zone. The lower zone is similar in appearance to the freswater samples. Detailed microscopic analyses revealed that the vertical zonation of PSOC-1340 is apparent in both the maceral and vitrinite type composition. No similar zonation is apparent in the microscopic analysis of the four freshwater facies samples. Similarities between the lower zone of PSOC-1340 and the whole seam of the freshwater samples are most apparent in the vitrinite-type analysis. The lower zone of PSOC-1340 and the whole seam from the freshwater facies are considered to be laterally equivalent coal types. The dull upper zone of PSOC-1340 is considered to have formed in response to a major change …
Date:
January 1, 1984
Creator:
Allshouse, S.D. & Davis, A.
Object Type:
Report
System:
The UNT Digital Library
Economics and applications of geothermal energy in St. Lucia
The assessment reported here consisted of three major tasks: first, a field geologic assessment of the physical extent of the Qualibou caldera geothermal resource; second, an engineering evaluation of the potential development of the geothermal resource; and third, a study of the potential economic impact upon St. Lucia associated with the development of the geothermal resource. The first task, the geologic assessment, is not discussed in detail.
Date:
January 1, 1984
Creator:
Altseimer, J. H.; Burris, A. E.; Edeskuty, F. J.; Trocki, L. K. & Williamson, K. D., Jr.
Object Type:
Article
System:
The UNT Digital Library
EVIDENCE IN CRATER AGES FOR PERIODIC IMPACTS ON THE EARTH
Recent evidence has indicated that the impact of a comet or asteroid may have been responsible for mass extinction at the ends of both the Cretaceous and the Eocene. Quantitative analysis by Raup and Sepkoski showed that mass extinctions occur with a 26-Myr period, similar to the period seen in qualitative pelagic records by Fischer and Arthur. To account for the possibility of periodic comet showers, Davis et al. proposed that such showers could be triggered by an unseen solar companion star as it passes through perihelion on a moderately eccentric orbit. To test a prediction implicit in this model we examined records of large impact craters on the Earth. We report here that most of the craters occur in a 28.4-Myr cycle. Within measurement errors, this period and its phase are the same as those found in the fossil mass extinctions. The probability that such agreement is accidental is 1 in 10.
Date:
January 1, 1984
Creator:
Alvarez, W. & Muller, R.A.
Object Type:
Article
System:
The UNT Digital Library
Construction and operation of a drift-collection calorimeter
Large areas planar drift chambers with long drift distance (up to 50 cm) have been developed for possible use in the new Soudan 2 nucleon decay detector. Design goals included fine sampling to determine the topology of complex events with several low-energy tracks. The large scale of the experiment (> 1000 metric tons) required large area inexpensive chambers, which also had good position resolution and multi-track separation. The chambers were to be installed between thin sheets of steel to form a finegrained detector. A second goal was the sampling of dE/dx with each position measurement, in order to determine the direction and particle identity of each track. In this paper we report on the construction and operation of a prototype dectector consisting of 50 chambers, separated by 3 mm-thick steel plates. Readout of drift time and pulse height from anode wires and an orthogonal grid of bussed cathode pads utilized 6-bit flash ADC's. This application of the drift-collection calorimeter technique to a nucleon decay detector follows the investigation by a number of groups of calorimeters for high energy detectors based on long drifting.
Date:
January 1, 1984
Creator:
Ambats, I.; Ayres, D.S.; Dawson, J.W.; Hoftiezer, J.H.; Mann, W.A.; May, E.N. et al.
Object Type:
Article
System:
The UNT Digital Library
Congressional Ethics in the 98th Congress
This report describes Congressional Ethics in the 98th Congress.
Date:
January 26, 1984
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Southwest Retort, Volume 36, Number 5, January 1984
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
January 1984
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Federal geothermal royalty income derived from the benefits of government-sponsored R and D
The ability of Federally-sponsored geothermal R and D to, in effect, pay for itself through increased royalty payments resulting from enhanced resource development on Federal lands is investigated. The report concludes that achievement of current Federal R and D objectives is likely to result in significant royalty returns to both state and Federal governments. These returns are measured in terms of the increase in royalty payments attributable to the achievement of Federal R and D objectives, as opposed to those payments which would be expected from the on-going low level of private sector R and D absent any Federal support. To perform this analysis, an integrated approach sequentially addresses (1) future wildcat drilling activity, (2) the number and quality of new resource discoveries, (3) the technological potential (megawatts) of the discovered resource base, and the likelihood that it will be developed, and (4) the royalty income which will be generated as a result of development of Federal land. This computer-based modeling approach has been developed by Technecon over the last 5 years under the sponsorship of both the Department of Energy and private industry. Portions of this model have been specially modified and updated during the course of this study.
Date:
January 31, 1984
Creator:
Amundsen, C.B.; Cassel, T.A.V. & Kathan, D.W.
Object Type:
Report
System:
The UNT Digital Library
Surface exploration geophysics applied to the moon
With the advent of a permanent lunar base, the desire to explore the lunar near-surface for both scientific and economic purposes will arise. Applications of exploration geophysical methods to the earth's subsurface are highly developed. This paper briefly addresses some aspects of applying this technology to near surface lunar exploration. It is noted that both the manner of application of some techniques, as well as their traditional hierarchy as assigned on earth, should be altered for lunar exploration. In particular, electromagnetic techniques may replace seismic techniques as the primary tool for evaluating near-surface structure.
Date:
January 1, 1984
Creator:
Ander, M.E.
Object Type:
Article
System:
The UNT Digital Library
Numerical creep analysis
A large deformation creep algorithm is presented that includes pore pressure and fluid migration effects. Its application is illustrated by the numericl analysis of rock folding with attendant fluid migration. 6 references, 2 figures. (ACR)
Date:
January 1, 1984
Creator:
Anderson, C. A.
Object Type:
Article
System:
The UNT Digital Library
Instrumentation and Controls evaluation for space nuclear power systems
Design of control and protection systems should be coordinated with the design of the neutronic, thermal-hydraulic, and mechanical aspects of the core and plant at the earliest possible stage of concept development. An integrated systematic design approach is necessary to prevent uncoordinated choices in one technology area from imposing impractical or impossible requirements in another. Significant development and qualification will be required for virtually every aspect of reactor control and instrumentation. In-core instrumentation widely used in commercial light water reactors will not likely be usable in the higher temperatures of a space power plant. Thermocouples for temperature measurement and gamma thermometers for flux measurement appear to be the only viable candidates. Recent developments in ex-core neutron detectors may provide achievable alternatives to in-core measurements. Reliable electronic equipment and high-temperature actuators will require major development efforts.
Date:
January 1, 1984
Creator:
Anderson, J.L. & Oakes, L.C.
Object Type:
Article
System:
The UNT Digital Library