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Fundamental Studies of Erosion for Coal Gasification Systems. Annual Progress Report, 1 November 1979-30 June 1980
The effort in this program is divided between modelling the particle impact event using numerical methods and computer calculations and actual measurement of erosion rates. While the results obtained from each of these activities must be combined to provide an improved understanding of particulate erosion of ductile materials, it is convenient to describe separately the progress in each activity area. The first step in the application of the finite element method to any problem is the dissolution of the continuum into small elements. The intent of this procedure is to use as few total elements as possible and to make the elements small where gradients are large and vice versa. The exact solution for the contact of a rigid cylinder with an elastic surface is available from Hertz. This solution has been compared with the computer results obtained from finite element maps containing 148, 273, and 474 elements. The correlation between the computer results and elastic solution is not good for the map with the fewest elements, but improves as the number of elements increases. Convergence to this exact solution has been examined as a function of the number of map elements as a means of improving the efficiency of …
Date:
July 27, 1980
Creator:
Follansbee, P. S.; Sinclair, G. B. & Williams, J. C.
Object Type:
Report
System:
The UNT Digital Library
Theoretical and experimental studies of churn flow in vertical tubes. Final technical report
The pattern known as churn flow is a highly unsteady pattern with stochastic features and is extremely complex. However, calculations show that for many geothermal wells the condition of churn flow consists over much of the length of the two phase zone. Furthermore, it frequently exists at the surface so that design of separation equipment and surface piping depends on the accurate modelling of this type of flow. It has been the long term purpose of this project to develop physically based models for churn flow which can be used as a basis for predicting holdup, frictional loss and heat transfer rates for this flow pattern in geothermal systems. To achieve this end, it was necessary to develop new methods for measuring the time dependent characteristics of the flow and thus be able to uncover the basic physics of the flow. Models can then be developed based on this understanding which characterizes the flow and equations for holdup, friction and heat transfer evolved.
Date:
January 27, 1986
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Fundamental characterization of alternate fuel effects in continuous combustion systems. Summary technical progress report, August 15, 1978-January 31, 1980
The overall objective of this contract is to assist in the development of fuel-flexible combustion systems for gas turbines as well as Rankine and Stirling cycle engines. The primary emphasis of the program is on liquid hydrocarbons produced from non-petroleum resources. Fuel-flexible combustion systems will provide for more rapid transition of these alternative fuels into important future energy utilization centers (especially utility power generation with the combined cycle gas turbine). The specific technical objectives of the program are: (a) develop an improved understanding of relationships between alternative fuel properties and continuous combustion system effects, and (b) provide analytical modeling/correlation capabilities to be used as design aids for development of fuel-tolerant combustion systems. This is the second major report of the program. Key experimental findings during this reporting period concern stirred combustor soot production during operation at controlled temperature conditions, soot production as a function of combustor residence time, an improved measurement technique for total hydrocarbons and initial stirred combustor results of fuel nitrogen conversion. While the results to be presented concern a stirred combustor which utilizes premixed fuel vapor/oxidant mixtures, a new combustor which combusts liquid fuel injected into the reactor as a spray has been developed and will be …
Date:
February 27, 1980
Creator:
Blazowski, W.S.; Edelman, R.B. & Wong, E.
Object Type:
Report
System:
The UNT Digital Library
Model for H/sup -/ and D/sup -/ production by hydrogen backscattering
The Marlowe Monte-Carlo backscattering code has been used to calculate particle reflection coefficients and energy distributions for H, D incident upon Li, K, Ni, Cu, Mo, Ag, Cs, Hf, W, Pt, and U surfaces. The backscattered energy and angular distributions are combined with a model for formation and survival probabilities for H/sup -/, D/sup -/ leaving the surface. A least-squares fit of experimental measurements of H/sup -/ yields from the composite surface, Cs/Cu, has been used to obtain two semi-empirical constants, ..cap alpha.., ..beta.. which enter into the formation and survival probabilities. These probabilities are used to calculate the production probability which in turn provides an upper limit to the negative ion yield. The choice of electrode material is discussed as a function of atomic number.
Date:
May 27, 1980
Creator:
Hiskes, J.R. & Schneider, P.J.
Object Type:
Report
System:
The UNT Digital Library
Comparing the Floating Point Systems, Inc. AP-190L to representative scientific computers: some benchmark results
Results are presented of comparative timing tests made by running a typical FORTRAN physics simulation code on the following machines: DEC PDP-10 with KI processor; DEC PDP-10, KI processor, and FPS AP-190L; CDC 7600; and CRAY-1. Factors such as DMA overhead, code size for the AP-190L, and the relative utilization of floating point functional units for the different machines are discussed. 1 table.
Date:
March 27, 1980
Creator:
Brengle, T.A. & Maron, N.
Object Type:
Article
System:
The UNT Digital Library
Magnetic shielding design analysis
Two passive magnetic-shielding-design approaches for static external fields are reviewed. The first approach uses the shielding solutions for spheres and cylinders while the second approach requires solving Maxwell's equations. Experimental data taken at LLNL are compared with the results from these shieldings-design methods, and improvements are recommended for the second method. Design considerations are discussed here along with the importance of material gaps in the shield.
Date:
December 27, 1983
Creator:
Kerns, J.A.; LaPaz, A.D. & Fabyan, J.
Object Type:
Article
System:
The UNT Digital Library
The excess flux in the cosmic submillimeter background radiation and the primordial deuterium abundance
Recent measurements of the cosmic background radiation (CBR) show an enhanced flux in the submillimeter regime, compared to the spectrum of a 2.7 K blackbody. Thermal Comptonization of the relic radiation by a hot nonrelativistic plasma has long been known to produce distortions in the CBR spectrum, similar to what has now been observed. Heating of the primeval plasma to temperatures T {approximately} 10{sup 6} {minus} 10{sup 8} K could result from the injection of subcosmic ray protons at epoch z {approximately} 10--100. The intensity of the subcosmic ray flux that provide conditions needed to explain the submillimeter excess by thermal Comptonization also leads to the production of cosmologically significant amounts of deuterium in collisions between subcosmic ray protons and primordial protons and {alpha}-particles. However, the amount of lithium produced through {alpha}-{alpha} reactions is in conflict with the observed Li abundance. If lithium is depleted, for example, by processing through Population II stars, arguments for the baryon content of the universe based on primordial deuterium and He abundances are weakened. 12 refs., 1 fig., 1 tab.
Date:
October 27, 1989
Creator:
Dermer, C. D.; Guessoum, N. (Lawrence Livermore National Lab., CA (USA) & National Aeronautics and Space Administration, Greenbelt, MD (USA). Lab. for High Energy Astrophysics)
Object Type:
Article
System:
The UNT Digital Library
Seismic risk analysis for General Electric Plutonium Facility, Pleasanton, California. Final report, part II
This report is the second of a two part study addressing the seismic risk or hazard of the special nuclear materials (SNM) facility of the General Electric Vallecitos Nuclear Center at Pleasanton, California. The Part I companion to this report, dated July 31, 1978, presented the seismic hazard at the site that resulted from exposure to earthquakes on the Calaveras, Hayward, San Andreas and, additionally, from smaller unassociated earthquakes that could not be attributed to these specific faults. However, while this study was in progress, certain additional geologic information became available that could be interpreted in terms of the existance of a nearby fault. Although substantial geologic investigations were subsequently deployed, the existance of this postulated fault, called the Verona Fault, remained very controversial. The purpose of the Part II study was to assume the existance of such a capable fault and, under this assumption, to examine the loads that the fault could impose on the SNM facility. This report first reviews the geologic setting with a focus on specifying sufficient geologic parameters to characterize the postulated fault. The report next presents the methodology used to calculate the vibratory ground motion hazard. Because of the complexity of the fault geometry, …
Date:
June 27, 1980
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Enhanced durability and reactivity for zinc ferrite desulfurization sorbent
AMAX Research Development Center (AMAX R D) has been investigating methods for improving the reactivity and durability of the zinc ferrite desulfurization sorbent. Zinc ferrite sorbents are intended for use in desulfurization of hog coal gas in integrated gasification combined cycle (IGCC) or molten carbonate fuel cell (MCFC) applications. The reactivity of the sorbent may be defined as its sulfur sorption capacity at the breakthrough point in a bench-scale fixed-bed reactor. The durability may be defined as the ability of the sorbent to maintain its reactivity and other important physical characteristics such as size, strength, and specific surface area during 10 cycles of sulfidation and regeneration. Two base case sorbents, spherical pellets and cylindrical extrudes used in related METC sponsored projects, are being used to provide a basis for the comparison of physical characteristics and chemical reactivity.
Date:
October 27, 1987
Creator:
Jha, M. C. & Berggren, M. H.
Object Type:
Report
System:
The UNT Digital Library
Upper limits on neutron bursts emitted from Ti pressurized D sub 2 gas cells
In a search for bursts of neutrons from Ti in pressurized D{sub 2} gas cells, no statistically significant deviations from the background were observed for events where five or more neutrons are detected over a ten day experiment, including 103 hours of counting with cells on, and 28 hours counting of various backgrounds. Up to four cells were used including some 60 grams of 662-Ti fillings in a pressurized cylinder with 40-60 atmosphere of D{sub 2} gas. Other Ti samples were used too. The samples were cooled to liquid nitrogen temperature and placed in front of the neutron detector while warming up to room temperature. Seven cooling cycles were used, for each sample. The neutron detector system included 12 liquid scintillator neutron detectors, arranged in a close packed geometry, with six detectors in the upper hemisphere and six in the lower hemisphere. A central detector placed 2 cm from the cells was used, in each hemisphere, as a scatterer for a time of flight coincidence measurement, yielding the total coincidence efficiency of {epsilon}=2{plus minus}1%. The system was also used in singles mode to allow for counting with large efficiency. A neutron event is characterized by measuring its pulse heights, pulse …
Date:
October 27, 1989
Creator:
Rugari, S. L.; France, R. H., III; Gai, M.; Lund, B. J.; Smolen, S. D.; Zhao, Z. et al.
Object Type:
Report
System:
The UNT Digital Library
Modified horizontal solar collector for low temperature grain drying
The project consisted of constructing a horizontal solar collector with a small amount of rock storage integrated into the collector air stream. The collected energy was used to dry corn in a 6000 bushel low-temperature drying facility. The collector proved to be economically feasible to build and collected sufficient energy to show a reasonable return on the investment.
Date:
January 27, 1980
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Seismic review of the R. E. Ginna Nuclear Power Plant as part of the Systematic Evaluation Program for the Nuclear Regulatory Commission
This paper is a progress report on work at the Lawrence Livermore National Laboratory (LLNL) to perform a limited seismic reassessment of the Robert E. Ginna Nuclear Power Plant. The reassessment is being done for the Nuclear Regulatory Commission (NRC) as part of the Systematic Evaluation Program. The reassessment focuses generally on the reactor coolant pressure boundary and on those systems and components necessary to shut down the reactor safely and to maintain it in a safe shutdown condition following a postulated earthquake characterized by a peak horizontal ground acceleration of 0.2 g. Methods and modeling procedures used to analyze a complex of interconnected buildings are highlighted.
Date:
May 27, 1980
Creator:
Murray, R. C.; Nelson, T. A.; Ng, D. S.; Liaw, C. Y.; Levin, H. A. & Cheng, T. M.
Object Type:
Article
System:
The UNT Digital Library
[Letter from Barbara Jungjohan to the Student Affairs Committee, August 27, 1987]
Memo from Barbara Jungjohan to members of the Student Affairs Committee, on August 27, 1987, establishing a time for the first meeting of the fall semester. An agenda is included, and she asks that she be informed if a member can't make the meeting.
Date:
August 27, 1987
Creator:
Jungjohan, Barbara
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Julian C. Stanley to James R. Miller, May 27, 1987]
Letter from Julian C. Stanley to James R. Miller, on May 27, 1987, congratulating him on getting approval for the Texas Academy of Mathematics and Science. He suggests they not open to program until fall of 1988, so that they can give time and thought to recruiting able students. Stanley also encloses several articles about gifted and talented students.
Date:
May 27, 1987
Creator:
Stanley, Julian C.
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Carl L. Yeckel to James Miller, May 27, 1988]
Letter from Carl L. Yeckel to James Miller, on May 27, 1988, informing him that the Board of Directors of the Carl B. and Florence E. King Foundation have decided to deny North Texas State University's request that they sponsor twenty TAMS students over three years.
Date:
May 27, 1988
Creator:
Yeckel, Carl L.
Object Type:
Letter
System:
The UNT Digital Library
[Photograph 2012.201.B0052.0417]
Photograph taken for a story in the Daily Oklahoman newspaper. Caption: "Wreckage Litters the roadway Thursday afternoon after a runaway trailer smashed into a car driven by Leona Green Trotter, 60, of Guthrie." Photo By David McDaniel, Original Photo dated 08-27-1981, Published on 08-28-1981"
Date:
August 27, 1981
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0111.0555]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "At the make a taco table are, from left, Julie Lorentz, Royce Brown, Patty Brown, Tina Franklin and Charlotte Piotner."
Date:
June 27, 1983
Creator:
Wilson, George R.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0089.0419]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Riders cool off at a portable shower during Saturday's Hotter'N Hell cycling race in Wichita Falls, Texas."
Date:
August 27, 1989
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0075.0804]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Jacquetta Hurley (left) and OSU's Jackie Glosson (42) battle for ball."
Date:
February 27, 1985
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0108.0245]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Terry Britton describes new cable TV college courses."
Date:
June 27, 1981
Creator:
Wilson, George R.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Memo from Rogers Redding to Jim Miller, September 27, 1988]
Memo from Rogers Redding to Jim Miller, on September 27, 1988, sending him a summary of the most recent meeting of the Texas Academy of Mathematics and Science Advisory Board.
Date:
September 27, 1988
Creator:
Redding, Rogers W.
Object Type:
Letter
System:
The UNT Digital Library
Plan for the Future of Neutron Research on Condensed Matter : An Argonne National Laboratory Report Prepared in Response to the "Report of the Review Panel on Neutron Scattering"
The Review Panel on Neutron Scattering has recommended an expanded budget to allow systematic development of the field. An alternative plan for the future of neutron research on condensed matter is presented here, in case it is not possible to fund the expanded budget. This plan leads, in a rational and logical way, to a world-class neutron source that will ensure the vitality of the field and exploit the many benefits that state-of-the-art neutron facilities can bring to programs in the materials and biological sciences.
Date:
January 27, 1981
Creator:
Argonne National Laboratory
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0115.0094]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Discussing club business are Joe Fallin, Jim Quigley, John bullard and Fletcher Williams."
Date:
March 27, 1984
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0103.0225]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Jason Brady's greatest wish was to see his little brother grow up.."
Date:
December 27, 1988
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History