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High resolution x-ray crystal spectrographs
Observation of x-ray line emissions are valuable for determining the thermodynamic state of the emitting plasma. For laser produced plasmas, diffraction crystals can be used to isolate x-ray monochromes to obtain high resolution spectral measurements. We will describe a versatile multi-crystal high resolution spectrograph used for photon energies from 0.5 to 6 keV. We will discuss a calculational package that tunes the response and sensitivity of the instrument and estimates the effect of source extent on spectral resolution. A scheme using fine slits to obtain spatial resolution with the basic instrument will also be described. An instrument is being built for Shiva diagnostics that incorporates a diffraction crystal and an x-ray streak camera. The design rationale for the crystal stage will be discussed.
Date:
October 21, 1977
Creator:
Koppel, L. N. & Eckels, J. D.
Object Type:
Article
System:
The UNT Digital Library
Ethnic Groups and American Politics: Selected References
This report provides a bibliography of resources related to various ethnic groups influence on American politics.
Date:
August 21, 1970
Creator:
Downing, Paul
Object Type:
Report
System:
The UNT Digital Library
Evaluation of the radionuclide concentrations in soil and plants from the 1975 terrestrial survey of Bikini and Eneu Islands
In June 1975 a radiological survey was conducted of the terrestrial environment of Bikini and Eneu islands (Bikini Atoll) to evaluate the potential radiation dose to the returning Bikini population. In this report, we present measurements of the radionuclide concentration in soil profiles and in dominant species of edible and nonedible, indicator plants. The use of these data to derive relationships to predict the plant uptake of radionuclides from soil is described. Approximately 620 soil and vegetation samples from Bikini and Eneu Islands were analyzed by Ge(Li) gamma spectrometry and by wet chemistry. The predominant radionuclides in these samples were /sup 60/Co, /sup 90/Sr, /sup 137/Cs, /sup 239,240/Pu, /sup 241/Pu, and /sup 241/Am.
Date:
January 21, 1977
Creator:
Colsher, C. S.; Robison, W. L. & Gudiksen, P. H.
Object Type:
Report
System:
The UNT Digital Library
Reactor safety. Quarterly technical progress report, October--December 1977. [LMFBR]
The objectives of the program are to conduct tests that will characterize the behavior of sodium oxide, fuel, fission product, and other aerosols as they might be generated by various postulated LMFBR accidents; determine by analysis and confirm by experiment the generation and transport of these aerosols with respect to source (location, type, and configuration), for the entire course of events associated with real and hypothetical accident conditions; and conduct tests that will determine the effect of molten fuel on reactor structural or sacrificial material.
Date:
March 21, 1978
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Powerplant Productivity Improvement Study: project summary report
Key findings from the Illinois Powerplant Productivity Improvement Study are: (1) the historic performance (equivalent availability) of large generating units in Illinois is below national average performance; (2) cost-effective opportunities to improve performance exist, and utilities pursue many of these; (3) there are no strong regulatory disincentives to the undertaking of productivity improvement projects, but no strong incentives either; (4) current utility practices, procedures, and management philosophy toward improved productivity are being strengthened; (5) areas in which immediate attention is warranted include application of reliability engineering tools to the analysis of powerplant availability and more vigorous pursuit of opportunities for performance improvements; (6) DOE systematic methodology for analysis of productivity improvement projects was demonstrated at three units and found to be useful; (7) the potential for improved productivity was estimated to be of the order of 2% in planned and forced outage rates; (8) if a 5% improvement were to be attained, cumulative (through 1990) constant-dollar benefits would be approximately $500 million; (9) formula regulatory incentive mechanisms are presently in a developmental or experimental phase, but adoption by the State of Illinois does not appear warranted at this time; and (10) the Illinois Commerce Commission can encourage improved productivity by …
Date:
December 21, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Three-dimensional temperature history of a multipass filled weldment. Part 2. [HEATINGS]
Computer simulation of the three-dimensional temperature history in a multipass filled weldment was attempted by modifying a transient heat transfer code, HEATING5. The model includes temperature-dependent physical parameters, radiation and convection heat losses, turbulent and laminar convection in the molten pool, and variable arc velocity, intensity, and weld geometry. The model requires approximately 28 CPU min to simulate one second of welding. 15 figures, 8 tables.
Date:
December 21, 1976
Creator:
Pinkowish, J.A. & Whitman, P.K.
Object Type:
Report
System:
The UNT Digital Library
Volume reduction system for solid and liquid TRU waste from the nuclear fuel cycle: October--December 1977
A bench-scale incinerator for the investigation of unusual particulate and gaseous radioactive material in the incinerator off-gas was assembled and equipment checkout was begun. Modifications to a glovebox to be used for the demonstration phase of incinerator-ash immobilization are approximately 80% completed with demonstration to begin next quarter. The curing time for ash-cement pressed pellets was optimized by periodic crush-strength testing of open-air and underwater cured samples. Leach tests were performed at 70 and 100/sup 0/C to simulate normal and extreme storage conditions. Long-term leach tests were initiated on plutonium-238 doped ash-cement pressed pellets in distilled water at ambient temperature. Pressed pellets of bone char, ash, and sludge-ash in several mixtures were fabricated and tested to establish pressing and curing parameters. Leach tests were also performed on bone char-cement pressed pellets. Curing studies have been conducted on the pressed pellet matrix to define differences between curing in the open atmosphere and under water. Leachability studies have been initiated on the pressed pellet ash/cement matrix in distilled water at ambient, 70 and 100/sup 0/C. Also, leachability studies on doped plutonium-238 pressed ash/cement pellets and pressed bone char/cement pellets in distilled water at ambient temperature have been conducted. Compressive strengths of bone …
Date:
April 21, 1978
Creator:
Luthy, D. F. & Bond, W.H.
Object Type:
Report
System:
The UNT Digital Library
PWR blowdown heat transfer separate-effects program data evaluation report: system response for thermal-hydraulic test facility test series 100
Selected reduced instrument responses and analyses of the indicated phenomena are presented for Thermal-Hydraulic Test Facility (THTF) test series 100, which is part of the PWR Blowdown Heat Transfer Separate-Effects Program. The objective of the program is to investigate the thermal-hydraulic phenomena that govern the energy transfer and transport processes occurring during a postulated loss-of-coolant accident in a pressurized-water reactor system. Comparisons are made between the trends indicated by the reduced instrument responses and the thermal-hydraulic transient simulator RELAP4/MOD5 (update 2) to aid in understanding the phenomenological sequences. The results of verification studies of RELAP's performance in prediction of the THTF data are presented.
Date:
October 21, 1977
Creator:
Hedrick, R. A.; Craddick, W. G.; Turnage, K. G. & Hyman, C. R.
Object Type:
Report
System:
The UNT Digital Library
Commercialization of a High Energy Neutral Beam Ion Source. Final Report
This final report summarizes the effort and presents the results of a Phase II fabrication effort to build an industrial prototype of the LBL developed high energy neutral beam source. The effort was primarily concentrated on incorporating hard vacuum dielectric seals and a ceramic high voltage accelerator insulator. Several other design changes were incorporated for cost, reliability or life improvements to include: (1) accelerator grid locating dowel pins to aid final alignment, (2) plasma source to accelerator captive fasteners to aid filament replacement during source maintenance, (3) molybdenum cooling tubes on all accelerator grids, (4) additional fasteners in the plasma generator to facilitate hard seals, (5) modified suppressor grid rails and holders to simplify final grid alignment, (6) adjusting screws on exit grid rail holders to simplify final grid alignment, (7) addition of adjusting screws to the grid end pieces to simplify alignment, and (8) addition of accelerator hat shims to allow two different grid positioning locations.
Date:
December 21, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Chemistry research and development. Research and development semiannual progress report, January--June 1977
Results of investigations and developmental activities are reported in chemical research, component research, instrumental and statistical systems, pilot plant research, and process chemistry and instrumentation. (JRD)
Date:
October 21, 1977
Creator:
Miner, F. J.
Object Type:
Report
System:
The UNT Digital Library
Report on the reconnaissance resistivity survey in the East Mesa area, Imperial County, California for U. S. Department of the Interior, Bureau of Reclamation
A section of notes on geothermal exploration using the resistivity method precedes the main body of the paper. Field data from the Broadlands Area of New Zealand, Java, and the Imperial Valley, California are included. The reconnaissance resistivity survey recently completed in the East Mesa Area confirmed that a broad zone of low resistivities at depth extends through the area in a NNW direction. The interpretation of the resistivity data and the location of the resistivity lows at depth is much less definite in the Imperial Valley than it is in other areas of geothermal exploration. This is due to the extremely low background level of resistivities. The low resistivities in the Imperial Valley are due to the high porosity of the sediments and the high salinity of the solutions contained within the rock. The expected decrease in resistivity due to elevated temperature is much more difficult to detect in this environment. Edges of the zones of low resistivities have been delineated in almost all directions. (JGB)
Date:
January 21, 1974
Creator:
Bell, B.S. & Hallof, P.G.
Object Type:
Report
System:
The UNT Digital Library
2660 A holographic interferometry of laser produced plasmas from tilted disk targets
Using double exposure holographic interferometry, an investigation has been made of the Nd laser produced plasmas surrounding disk targets irradiated at different angles of incidence. Measurements have produced a detailed description of the plasma profile necessary for realistic simulations of resonance absorption. A 2660A 15 psec probe pulse is produced by frequency quadrupling a fraction of the main Nd laser pulse from the Janus laser. F/1 and f/10 lenses were utilized to irradiate the targets with intensities ranging from 10/sup 13/ w/cm/sup 2/ to 10/sup 16/ w/cm/sup 2/. Measurements have produced the shape of the electron density profile near critical, the direction of the plasma blowoff, and revealed transverse rippling of the isodensity surfaces.
Date:
October 21, 1977
Creator:
Auerbach, J.M.; Attwood, D.T.; Lee, P.H.Y. & Sweeney, D.W.
Object Type:
Article
System:
The UNT Digital Library
Fundamental study of crack initiation and propagation. [Computer model of ductile fracture]
Objective is to determine the fracture toughness of A533B-1 steel by computer modeling Charpy V-notch tests. A computer model of ductile fracture was developed that predicts fracture initiation. The model contains a set of material-dependent parameters obtained by computer simulations of small specimen tests. The computer calculations give detailed stress and strain histories up to the time of fracture, which are used to determine the model parameter values. The calibrated fracture model, that correctly predicts fracture initiation (and initiation energy) in the Charpy specimen, may then be used to simulate tests of accepted fracture-toughness specimens and hence obtain fracture toughness. The model parameters were calibrated to predict fracture in four different test specimens: two different notched-tension specimens, a simple tension specimen, and a precracked compact-tension specimen. The model was then used in a computer simulation of the Charpy V-notch specimen to initiate and advance a flat fracture. Results were compared with interrupted Charpy tests. Calibration of the model for two additional heat treatments of A533B-1 steel is in progress.
Date:
December 21, 1977
Creator:
Norris, D.M. Jr.; Reaugh, J.E.; Moran, B.; Quinones, D.F. & Wilkins, M.L.
Object Type:
Article
System:
The UNT Digital Library
Near Term Hybrid Passenger Vehicle Development Program. Phase I, Final report
Activities performed in the Near Term Hybrid Vehicle (NTHV) program which studied the technical, economic, and fuel conservation aspects of replacing new 1985 full sized passenger cars in the US with automobiles having combination heat engines and electric motor power are summarized. These studies included NTHV design for the body power units, transmission system, and controls; evaluation of alternative strategies; the fuel conservation expected; goals for vehicle performance, safety and reliability; economic analysis, and mathematical models for use in the computer-aided design of the optimum performance NTHV. (LCL)
Date:
September 21, 1979
Creator:
Montalenti, P. & Piccolo, R.
Object Type:
Report
System:
The UNT Digital Library
Absolute instrumental neutron activation analysis at Lawrence Livermore Laboratory
The Environmental Science Division at Lawrence Livermore Laboratory has in use a system of absolute Instrumental Neutron Activation Analysis (INAA). Basically, absolute INAA is dependent upon the absolute measurement of the disintegration rates of the nuclides produced by neutron capture. From such disintegration rate data, the amount of the target element present in the irradiated sample is calculated by dividing the observed disintegration rate for each nuclide by the expected value for the disintegration rate per microgram of the target element that produced the nuclide. In absolute INAA, the expected value for disintegration rate per microgram is calculated from nuclear parameters and from measured values of both thermal and epithermal neutron fluxes which were present during irradiation. Absolute INAA does not depend on the concurrent irradiation of elemental standards but does depend on the values for thermal and epithermal neutron capture cross-sections for the target nuclides. A description of the analytical method is presented.
Date:
December 21, 1977
Creator:
Heft, R.E.
Object Type:
Article
System:
The UNT Digital Library
Sub-keV, subnanosecond measurements of x-ray spectra from laser-produced plasmas
As part of the effort to extend our x-ray diagnostic capabilities, we have made x-ray spectral measurements of laser-produced plasmas for photon energies down to 100 eV with a time response of 0.5 nsec. Fast, windowless x-ray diodes were used in conjunction with critical angle reflecting mirrors and thin filters for energy definition for two channels, 300 to 600 eV and 800 to 1300 eV. A third channel, using only an x-ray diode and filter, provided spectral information in the 100 to 300 eV region. Results from exploding pusher targets will be presented and compared with those of other diagnostic techniques and Lasnex calculations. Future expansion and modifications of the present system will be discussed.
Date:
October 21, 1977
Creator:
Kornblum, H. N.; Koppel, L. N.; Slivinsky, V. W.; Glaros, S. S.; Ahlstrom, H. G. & Larsen, J. T.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0408.0170]
Photograph taken for a story in the Daily Oklahoman newspaper. Caption: "Dennis Long keeps a desperate hand-hold on the State Fair bucking bronco machine to weather his 28th ride."
Date:
September 21, 1975
Creator:
Traverse, Cliff
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Fire at Claremore Business District]
A daylight photograph of a fire at Claremore in Rogers County, Oklahoma. Onlookers watch as firemen endure intense smoke while battling a fire in the Claremore business district. Black wax pencil and editing marks are visible on the image. Caption: "Claremore business district blazes under clouds of dense smoke Friday."
Date:
February 21, 1970
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0298.0369]
Photograph taken for a story in the Oklahoma Times newspaper.
Date:
January 21, 1971
Creator:
Wilson, Joe
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0408.0178]
Photograph taken for a story in the Daily Oklahoman newspaper.
Date:
September 21, 1975
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0298.0223]
Photograph taken for a story in the Oklahoma Times newspaper. Caption: "Catching the admiring gaze of Margaret Kidd, left, and Karen Hulsey are the equally colorful and typical Mexican flowers and piñatas."
Date:
November 21, 1973
Creator:
Carter, J. Pat
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0241.0601]
Photograph taken for a story in the Daily Oklahoman newspaper.
Date:
February 21, 1974
Creator:
Mooney, Hank
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0242.0700]
Photograph taken for a story in the Daily Oklahoman newspaper. Caption: "Christmas boots are readied by Mrs. Monte Cotton left, and Mrs. Audrey Cotton, right to be passed out among youngsters at Children's Memorial Hospital."
Date:
December 21, 1972
Creator:
Miller, Joe
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0408.0160]
Photograph taken for a story in the Daily Oklahoman newspaper. Caption: "( Pottery Display )"
Date:
September 21, 1975
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History