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1/2 Sintering of Mullite-Containing Materials: I. Effect of Composition
Sintering behavior of mullite-containing powders was studied over a range of chemical compositions (Al{sub 2}O{sub 3}/SiO{sub 2} ratio). Densification measurements were made for both liquid phase-containing and solid state systems. Small amounts of liquid phase were observed to have a significant effect on densification rate. A linear relationship was obtained between the percent of theoretical density and the logarithm of time for compositions in the range 73-75 wt% Al{sub 2}O{sub 3}. Currently available models for intermediate stage sintering kinetics were considered to be inadequate for these systems. Grain boundary transport 0r diffusion appeared to be the primary mechanism of densification.
Date:
December 1, 1981
Creator:
Sacks, Michael D. & Pask, Joseph A.
Object Type:
Article
System:
The UNT Digital Library
3. 6 simplified methods for design
Simplified design analysis methods for elevated temperature construction are classified and reviewed. Because the major impetus for developing elevated temperature design methodology during the past ten years has been the LMFBR program, considerable emphasis is placed upon results from this source. The operating characteristics of the LMFBR are such that cycles of severe transient thermal stresses can be interspersed with normal elevated temperature operational periods of significant duration, leading to a combination of plastic and creep deformation. The various simplified methods are organized into two general categories, depending upon whether it is the material, or constitutive, model that is reduced, or the geometric modeling that is simplified. Because the elastic representation of material behavior is so prevalent, an entire section is devoted to elastic analysis methods. Finally, the validation of the simplified procedures is discussed.
Date:
January 1, 1981
Creator:
Nickell, R.E. & Yahr, G.T.
Object Type:
Article
System:
The UNT Digital Library
3-D Nonlinear Calculations of Resistive Tearing Modes
Recent numerical calculations of the evolution of resistive tearing modes have been central to the understanding of magnetohydrodynamic activity and disruptions in tokamaks. The nonlinear, 3-D, initial-value computer code RSF has provided many of these results. This code assumes cylindrical geometry with a Fourier series representation in the two periodic coordinates and a finite-difference representation in the radial direction. This choice makes RSF considerably more accurate and efficient than previous codes.
Date:
March 1, 1981
Creator:
Hicks, H. R.; Holmes, J. A.; Lee, D. K.; Carreras, B. & Waddell, B. V.
Object Type:
Report
System:
The UNT Digital Library
T-3 electron-beam-excited laser system
A laser system specifically designed to study the kinetics of electron-beam driven systems is described. Details of the system are given along with measurements of the electron-beam uniformity and deposition in the laser medium. Some HF laser results obtained with this system are also given.
Date:
February 1, 1981
Creator:
Klein, R. A.
Object Type:
Report
System:
The UNT Digital Library
3-megajoule heavy-ion fusion driver
The initiation of inertial confinement fusion reactions with a heavy ion particle beam has been under intensive study since 1976, and the progress of this study is principally documented in the proceedings of annual workshops held by US National Laboratories. At this time a 3MJ, 150 TW, ion beam is a good choice to initiate microexplosions with energy gain of 100. The Lawrence Berkeley Laboratory has made systems studies based on a Linear Induction Accelerator to meet the beam requirements. The accelerator system, expected performance and cost, and technical problems to be addressed in the near future are discussed.
Date:
June 1, 1981
Creator:
Faltens, A.; Hoyer, E. & Keefe, D.
Object Type:
Article
System:
The UNT Digital Library
[4-panel piece, handmade paper on silk]
The artwork consists of four panels each turned on point. A grid ladder pattern turned in various directions appears in each panel. The colors are warm reddish browns and light blues. Other rectangular and triangular outlined shapes appear scattered across the panels.
Date:
1981~
Creator:
Spear, Shigeko
Object Type:
Artwork
System:
The UNT Digital Library
6 electronic preludes
Access:
Use of this item is restricted to the UNT Community
Recording of Bohdan Mazurek's 6 electronic preludes for tape.
Date:
1981
Creator:
Mazurek, Bohdan
Object Type:
Sound
System:
The UNT Digital Library
8 Deustche Tänze
Access:
Use of this item is restricted to the UNT Community
Recording of Peter Wessing's 8 Deutsche Tanze.
Date:
1981/1982
Creator:
Wessing, Peter
Object Type:
Sound
System:
The UNT Digital Library
10-joule high-voltage trigger micro Marx
A low energy Marx generator makes a convenient trigger for various spark gaps. With an output around 200 kV and a risetime less than 2 ns, the micro-Marx can multichannel field distortion gaps or fire a number of gaps without much gap-to-gap isolation. This design features small size, low cost, and good triggering characteristics. The complete unit is shown.
Date:
January 1, 1981
Creator:
Platts, D. A.
Object Type:
Article
System:
The UNT Digital Library
10-kA pulsed power supply for superconducting coils
A new 4-MW inductor-converter bridge (ICB) for supplying power to pulsed superconducting magnets is under construction at Argonne National Laoratory. This is a second-generation ICB built at Argonne Lab. The analytical, design, and control techniques developed for the first prototype have been used in the design of the new system. The paper presents the important considerations in the design of the new ICB. A brief description of the operation of the circuit is also given.
Date:
January 1, 1981
Creator:
Ehsani, M.; Fuja, R. E. & Kustom, R. L.
Object Type:
Article
System:
The UNT Digital Library
10-MWe solar-thermal central-receiver pilot plant, solar facilities design integration: collector-field optimization report (RADL item 2-25)
Appropriate cost and performance models and computer codes have been developed to carry out the collector field optimization, as well as additional computer codes to define the actual heliostat locations in the optimized field and to compute in detail the performance to be expected of the defined field. The range of capabilities of the available optimization and performance codes is described. The role of the optimization code in the definition of the pilot plant is specified, and a complete description of the optimization process itself is given. The detailed cost model used by the optimizer for the commercial system optimization is presented in the form of equations relating the cost element to each of the factors that determine it. The design basis for the commercial system is presented together with the rationale for its selection. The development of the individual heliostat performance code is presented. Use of the individual heliostat code in a completed study of receiver panel power under sunrise startup conditions is described. The procedure whereby performance and heliostat spacing data from the representative commercial-scale system are converted into coefficients of use in the layout processor is described, and the actual procedure used in the layout processor is …
Date:
January 1, 1981
Creator:
unknown
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
20-kW Solar Photovoltaic Flat-Panel Power System for an Uninterruptible Power-System Load in El Paso, Texas. Phase Ii. System Fabrication. Final Report October 1, 1979-May 31, 1981
The system plans, construction, integration and test, and performance evaluation are discussed for the photovoltaic power supply at the Newman Power Station in El Paso, Texas. The system consists of 64 parallel-connected panels, each panel containing nine series-connected photovoltaic modules. The system is connected, through power monitoring equipment, to an existing DC bus that supplies uninterruptible power to a computer that controls the power generating equipment. The site is described and possible environmental hazards are assessed. Site preparation and the installation of the photovoltaic panels, electrical cabling, and instrumentation subsystems are described. System testing includes initial system checkout, module performance test, control system test. A training program for operators and maintenance personnel is briefly described, including visual aids. Performance data collection and analysis are described, and actual data are compared with a computer simulation. System drawings are included. (LEW)
Date:
December 1, 1981
Creator:
Risser, V.V.
Object Type:
Report
System:
The UNT Digital Library
E-27 Lewis-Long (3-30-81)
Photograph of two Norman firemen wiping off a brand new American LaFrance pumper. No. 27. Many details on the back, including the names. March 30, 1981. Photo taken on the front drive of fire station #1.
Date:
March 30, 1981
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
28-nm laser damage testing of LIF
We have tested several samples of LIF, both single crystal and press forged, for damage resistance to 10-ns 248-nm pulses at 35 pps. The damage thresholds - the highest levels at which no damage could be produced - ranged from 4 to 6 J/cm/sup 2/ although some test sites survived irradiation at approx. 30 J/cm/sup 2/. We observed that bulk damage is the primary failure mechanism in single crystal and press forged samples and that both types exhibit the same resistance to laser damage.
Date:
January 1, 1981
Creator:
Foltyn, S. R. & Newman, B. E.
Object Type:
Article
System:
The UNT Digital Library
30-kV Proton Injector for PIGMI
A 30-kV proton injector designed for matching a 31-mA proton beam into the radio-frequency quadrupole (RFQ) section of the PIGMI accelerator has been constructed and tested. This injector uses a small efficient duoplasmatron ion source and a single-gap extraction system for creating a convergent ion beam, and a three-element unipotential einzel lens for focusing the ion beam into the RFQ. A description of this prototype injector is presented, along with the experimental data obtained during the testing of this system.
Date:
January 1, 1981
Creator:
Hamm, R. W.; Mueller, D. W. & Sturgess, R. G.
Object Type:
Article
System:
The UNT Digital Library
30-MJ superconducting magnetic energy storage for BPA transmission-line stabilizer
The Bonneville Power Administration operates the transmission system that joins the Pacific Northwest and southern California. A 30 MJ (8.4 kWh) superconducting Magnetic Energy Storage (SMES) unit with a 10 MW converter can provide system damping for low frequency oscillations. The unit is scheduled to operate in late 1982. Progress to date is described. The coil is complete. All major components of the electrical and cryogenic systems have been received and testing has begun. Computer control hardware is in place and software development is proceeding. Support system components and dewar lid are being fabricated and foundation design is complete. A contract for dewar fabrication is being negotiated.
Date:
January 1, 1981
Creator:
Schermer, R.I.
Object Type:
Article
System:
The UNT Digital Library
30-MJ superconducting magnetic-energy storage for BPA transmission-line stabilizer
The Bonneville Power Administration operates the transmission system that joins the Pacific Northwest and southern California. A 30 MJ (8.4 kWh) Superconducting Magnetic Energy Storage (SMES) unit with a 10 MW converter can provide system damping for low frequency oscillations. The unit is scheduled to operate in 1982. Progress during FY 81 is described. The coil is complete. All major components of the electrical and cryogenic systems have been received and testing has begun. Computer control hardware is in place and software development is proceeding. Support system components and dewar lid are being fabricated and foundation design is complete. A contract for dewar fabrication is being negotiated.
Date:
January 1, 1981
Creator:
Schermer, R. I.
Object Type:
Article
System:
The UNT Digital Library
30-MJ superconducting magnetic energy storage for electric-transmission stabilization
The Bonneville Power Administration operates the electric power transmission system that connects the Pacific Northwest and southern California. The HVAC interties develop 0.35 Hz oscillations when the lines are heavily loaded. A 30 MJ (8.4 kWh) Superconducting Magnetic Energy Storage (SMES) unit with a 10 MW converter can provide system damping for the oscillation. The unit is scheduled for installation in 1982 and operation in 1982-83. Status of the project is described. The conductor has been fully tested electrically and mechanically and the 5 kA superconducting cable has been produced. The 30 MJ superconducting coil is essentially complete. All major components of the electrical and cryogenic systems except the nonconducting dewar have been completed. The refrigerator and converter are undergoing tests. The system is to be located at the BPA Tacoma Substation and operated by microwave link from Portland, OR.
Date:
January 1, 1981
Creator:
Turner, R. D. & Rogers, J. D.
Object Type:
Article
System:
The UNT Digital Library
['81 Razzle Dazzle Dallas flyer]
A flyer for the 1981 Razzle Dazzle in Dallas on June 20.
Date:
1981
Creator:
Razzle Dazzle Dallas, Inc.
Object Type:
Text
System:
The UNT Digital Library