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88
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74
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Electrooptic deflector design considerations or use in the crystal streak camera
Figure-of-merit equations for material selection and detailed design equations have been developed to aid in the design of a linear electrooptic deflector element for use in a 10-ps streak camera. The figure of merit indicates that BaTiO/sub 3/, KTN, and ammonium oxalate (AMO) are suitable materials. Possible deflector designs, including that of a current AMO prototype development program, are discussed. Quadratic (Kerr-effect) operation and materials are discussed along with the possibility for 10.6-..mu..m-wavelength use.
Date:
June 28, 1978
Creator:
Thomas, S.W.
Object Type:
Article
System:
The UNT Digital Library
Continuous liquid feed Czochralski growth. LSSA Large Area Silicon Sheet Task. Quarterly report No. 3, April--June 1978
Siltec Corporation's contract with JPL is directed towards the design and development of equipment and processes, to demonstrate continuous growth of crystals by the Czochralski method, suitable for producing single silicon crystals for use in solar cells. Continuous growth is defined as the growth of 100 Kg of single silicon crystal, 10 cm in diameter, from one container. Siltec's approach to meeting this goal is to develop a furnace with continuous liquid replenishment of the growth crucible, accomplished by a meltdown system and a liquid transfer mechanism, with associated automatic feedback controls. The design of the furnace elements has been completed, and all parts are now in the fabrication stage. The electronic control console regulating the growth system and meltdown system, and the liquid transfer mechanism, has been assembled. An experiment was performed with a standard production furnace, to demonstrate controlled flow of molten silicon through a small I.D. tube by pressure differential. Sections of the transfer tube system were evaluated, power requirements to balance heat losses determined, axial temperature profile in the tube, and radial temperature gradients in the heat pack were measured. A mathematical model was made for the electromagnetic throttle valve to control flow of molten silicon …
Date:
June 28, 1978
Creator:
Fiegl, G.
Object Type:
Report
System:
The UNT Digital Library
Electric-powered passenger vehicle program
A revised program plan is presented for developing an electric vehicle incorporating a flywheel regenerative power system with design considerations and goals for safety and for vehicle body construction using lightweight fiber-reinforced composite material. Schedules are included for each of the major steps in the program. (LCL)
Date:
June 28, 1977
Creator:
Rowlett, B.H.
Object Type:
Report
System:
The UNT Digital Library
Spectroscopic investigations of small-molecule interactions on metal oxide surfaces. Final report, September 1, 1978-December 31, 1981
Angle integrated and angle resolved ultraviolet photoelectron spectroscopy (UPS and ARPES) and high resolution electron energy loss spectroscopy (HREELS) have been performed on the low index single crystal surfaces of zinc oxide. Study of CO/ZnO shows that the mode of binding is dominated by 5sigma donation from the carbon end of the molecule to the unsaturated surface zinc ion with little ..pi.. backbonding to the CO2..pi..* orbital. This electronic structure is verified by a HREELS study. The geometry of CO binding is consistent with LEED studies where no symmetry changing reconstructions are observed to occur, and where the CO molecule forms an approximately linear Zn-C-O surface complex along the coordinatively unsaturated directions of the surface zinc ions. Implications of these studies to the mechanism of methanol synthesis is described. These UPS studies have also provided insight into the bonding interaction between small molecules such as NH/sub 3/ and CO/sub 2/ (as well as H/sub 2/O, C/sub 2/H/sub 4/, CH/sub 3/OH, H/sub 2/S and CH/sub 3/SH) and the ZnO single crystal surfaces.
Date:
June 28, 1982
Creator:
Solomon, E. I. & McFeely, F. R.
Object Type:
Report
System:
The UNT Digital Library
Subsurface probing
Imaging techniques that can be used to translate seismic and electromagnetic wave signals into visual representation are briefly discussed. The application of these techniques is illustrated on the example of determining the subsurface structure of a proposed power plant. Imaging makes the wave signals intelligible to the non-geologists. R and D work needed in this area are tabulated. (JSR)
Date:
June 28, 1978
Creator:
Lytle, R.J.
Object Type:
Article
System:
The UNT Digital Library
Geothermal loop experimental facility. Quarterly project report, April 1, 1976-June 30, 1976
Operations with the Geothermal Loop Experimental Facility are reviewed. Inspection of the separators, scrubbers, pumps, valves, and controls is described. (MHR)
Date:
June 28, 1976
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Radiological sciences department investigation: Radiation incident class I, No. 608-C
At about 6:30 a.m. one of the two Process Operators regularly stationed at 233-S was performing routine work in the Control Room, heard a nearby Poppy alpha detector breaking down.'' He checked and found the instrument appeared to be in operating condition as it would respond to a high level source. Further checking indicated that he was contaminated and that nearby horizontal surfaces were contaminated. This information was phoned to the Shift Supervisor who told the Operator that he would be right out and to throw a pair of shoe covers out the door. On arriving, the Supervisor donned the shoe covers and then quickly checked the Poppy response and confirmed the report of the Operator. Both men then left the building. Just outside they met the other Process Operator assigned to 233-S, returning from the lunchroom. The second Operator was handed a smear, previously taken and checked by the Supervisor, and told to check it on a Poppy in the load-out-room, a room adjacent to where the contamination was originally found. When the Supervisor heard the load-out-room Poppy break down as the smear was checked he instructed both Operators to stand by just outside the building while he went …
Date:
June 28, 1956
Creator:
Vanderbeek, J.W.
Object Type:
Report
System:
The UNT Digital Library
Self-induced rainout from a nuclear weapon
The conclusions we have reached are that rainout of fresh radioactive debris occurred at Hiroshima and Nagasaki, that this precipitation was initiated either by the weapon itself or by the ensuing fires or by both, and that self-induced rainout can occur and deposit sufficient amounts of radioactivity on the ground to pose a significant collateral damage hazard.
Date:
June 28, 1979
Creator:
Molenkamp, C.R.
Object Type:
Article
System:
The UNT Digital Library
Catalytic studies on a novel synthesis of methanol
Catalytic studies on a new method for methanol synthesis from CO and H{sub 2} in a slurry reactor are described. This reaction proceeds through the carbonylation of methanol to methyl formate in the liquid phase followed by hydrogenolysis of methyl formate to two molecules of methanol; the net result is the reaction of CO with H{sub 2} to give methanol. Moderate temperatures and pressures (100--160{degrees}C, 50--65 atm) are used. Reaction rates using mixed catalysts comprised of an alkali methoxide and Cu-chromite are presented. It seems likely that Cu-chromite maintains the activity of the alkali methoxide catalyst. A mixed catalyst comprised of potassium methoxide and Cu-chromite was found to be the most active under the reaction conditions used. Evidence is provided for an interaction between the alkali methoxide and Cu-chromite. 27 refs., 6 figs., 2 tabs.
Date:
June 28, 1991
Creator:
Palekar, V.M.; Tierney, J.W. & Wender, I.
Object Type:
Article
System:
The UNT Digital Library
Water simulation of sodium reactors
The thermal hydraulic simulation of a large sodium reactor by a scaled water model is examined. The Richardson Number, friction coefficient and the Peclet Number can be closely matched with the water system at full power and the similarity is retained for buoyancy driven flows. The simulation of thermal-hydraulic conditions in a reactor vessel provided by a scaled water experiment is better than that by a scaled sodium test. Results from a correctly scaled water test can be tentatively extrapolated to a full size sodium system.
Date:
June 28, 1981
Creator:
Grewal, S. S. & Gluekler, E. L.
Object Type:
Article
System:
The UNT Digital Library
Differential Thermal Analysis of Uranium Tetrafluoride-Uranium Dioxide Mixtures
Abstract: "Approximate melting points have been determined for five samples of uranium tetrafluoride representing incompletely converted uranium dioxide and covering the range from about 2 to 20 w/o UO2, using the method of differential thermal analysis. The results indicate the melting temperatures are in the range of 920 to 980 C. No significant correlation between melting point and UO2 content was observed, possibly because of calcite formation. Similar results were obtained on synthetic mistakes of UF4 containing from 10 to 40 w/o UO2."
Date:
June 28, 1956
Creator:
Ewing, Robert A. & Bearse, Arthur E.
Object Type:
Report
System:
The UNT Digital Library
Accelerator Beam Pulsing System With Extremely Wide Range of Pulse Lengths and Pulse Repetition Rates
The following document describes the usage and results of sending pulsed beams of electrically charged particles with electrically wide range of pulse lengths and pulse repetition rates.
Date:
June 28, 1960
Creator:
Aaland, Kristian
Object Type:
Report
System:
The UNT Digital Library
The Solubility of Plutonium (IV) Monobutyl Phosphate
Report discussing a study regarding the identification and property analysis of plutonium (IV) monobutyl phosphate, which formed as a white precipitate in another study of the effects of monobutyl phosphate on plutonium(IV) in tributyl phosphate extractions.
Date:
June 28, 1950
Creator:
Moore, Robert Lee
Object Type:
Report
System:
The UNT Digital Library
Examination of Masonite in Biological Shield : Interim Report
Introduction: "Evidence of masonite deterioration in test hole plugs was interpreted to mean that a previous estimate of the minimum lifetime of the masonite in a Hanford biological shield might be somewhat optimistic. The importance of understanding the effects of radiations on masonite for both present and future pile shields dictated that masonite be sampled from an operating pile shield and studied. The results and techniques are discussed in the following sections of this report."
Date:
June 28, 1950
Creator:
Dickeman, R. L.
Object Type:
Report
System:
The UNT Digital Library
Bare Beryllium Extrusion Using Graphite Introductory Cones
The following document describes the process of rare beryllium extrusion using graphite introductory cones with the purpose of finding a lubricant which would decrease excessive friction between the billet and prose parts.
Date:
June 28, 1949
Creator:
Arnold, Samuel V.
Object Type:
Report
System:
The UNT Digital Library
Solar atrium: a hybrid solar heating and cooling system. Technical progress report No. 7, March 19, 1979-June 19, 1979
Construction progress is listed and photographs of the solar atrium are included. (MHR)
Date:
June 28, 1979
Creator:
Ueland, M.
Object Type:
Report
System:
The UNT Digital Library
Materials selection and corrosion problems
Data tabulated for chemical composition of geothermal waters are presented for four areas of interest in Nevada: Beowawe steam well and Beowawe Hot Spring, Buffalo Valley Hot Springs, Kyle Hot Springs, and Leach Hot Springs. Material recommendations were prepared for the Nevada geothermal well. A detailed field corrosion test program planned for the Nevada test well is included. A progress report is presented for a laboratory research program on velocity effects in corrosion. (MHR)
Date:
June 28, 1974
Creator:
Cornet, I.; Greif, R. & Treseder, R.S.
Object Type:
Report
System:
The UNT Digital Library
Adult Fishway Inspections on the Columbia and Snake Rivers, 1984-1985 Annual Report.
Mainstream projects which have adult fish passage facilities are inspected by project operators, fishway attendants, and state and federal fishery agencies. The overall movement of upstream migrants in 1984 appeared to be satisfactory with few delays. Special efforts were made by fishery agencies and Corps personnel to check on potential problems which appeared to exist at The Dalles and John Day Dams this year. However, adult passage facilities were operating ''in criteria'' and fish may have been delayed by temperature or other factors. Inspections were generally made once a month. Some projects were operating at less than full criteria as seen during inspections by fishery agencies this year. It appears that during periods of low tailwater, certain projects have difficulty maintaining proper head at main fishway entrances. Some main entrance gates bottom-out and water depth over these weirs are not up to desired criteria. Also it was noted that auxiliary water pumps were not being run at a rate to achieve the desired amount of water for attracting fish to the fish ladders and maintaining proper head at main fishway entrances.
Date:
June 28, 1985
Creator:
Basham, Larry R.
Object Type:
Report
System:
The UNT Digital Library
Economic evaluation of the MIT process for manufacture of ethanol
This report summarizes the results of an economic evaluation of the MIT process for the manufacture of ethanol from cellulosic residues. Conceptual process designs were developed for two cases, Case A which is based on the experimental data obtained to date, and Case B which hypothesizes the suppression of acid byproducts. Manufacturing costs, including profit, were estimated at $12.20/million Btu for Case A and $9.40/million Btu for Case B. These are equivalent to about $1.05 and $0.80/gal ethanol respectively. These economic estimates may be slightly on the low side since they do not consider feedstock storage nor working capital requirements. Nevertheless, the manufacturing costs for Case A appear to be comparable to those of the manufacture of ethanol from corn. The plant size used for this analysis was 1500 ton/day corn stover. This is considered to be a realistic size. The conceptual plants make about 27 million gal/yr ethanol in Case A and 41 million gal/yr in Case B. The MIT process appears to be one of the more promising programs being developed under contract for DOE. It is recommended that the process research be continued. Three areas of concern were identified which must be investigated before the process can …
Date:
June 28, 1979
Creator:
Jenkins, D. M. & Reddy, T. S.
Object Type:
Report
System:
The UNT Digital Library
Primary Shield Optimization Survey for the PL-3 Reactor
A detailed study of four reactor and shield configurations was made. Two basic reactor types, the boiling water and pressurized water reactors were considered. Shield materials of lead-water and iron-water were used with varying thicknesses for determining the optimum shield configuration for the PL-3 reactor. Also presented is a survey of available shielding codes. (auth)
Date:
June 28, 1962
Creator:
Scoles, J. F. & Crouch, A. N.
Object Type:
Report
System:
The UNT Digital Library
Electron energy distributions, vibrational population distributions, and negative-ion concentrations in hydrogen discharges
We consider the negative ion concentrations in hydrogen discharges caused by electron excitation and dissociative attachment processes. The principal formation and destruction processes are discussed for electron densities in the range 10/sup 8/ to 10/sup 13/ electrons cm/sup -3/. Expressions are developed for calculating the high energy portion of the electron energy distribution in the discharge; using these energy distributions the electron excitation rates are evaluated. At low densities, the vibrational distribution arises from singlet electronic excitations and triplet excitations through the /sup 3/..pi../sub u/ state, in equilibrium with wall de-excitation processes. At high densities singlet excitations predominate in equilibrium with atom-molecule de-excitation processes. Possibilities for negative ion generation in a two-chamber tandem system are discussed in which the vibrational excitation occurs in a high power, high electron temperature discharge, kT/sub e/ = 5 eV, and dissociative attachment occurs in a low temperature kT/sub e/ = 1 eV, plasma chamber.
Date:
June 28, 1982
Creator:
Hiskes, J.R. & Karo, A.M.
Object Type:
Article
System:
The UNT Digital Library
Radiation effects on structural materials
This report discusses the following topics on the effect radiation has on thermonuclear reactor materials: Atomic Displacements; Microstructure Evolution; Materials Engineering, Mechanics, and Design; Research on Low-Activation Steels; and Research Motivated by Grant Support.
Date:
June 28, 1991
Creator:
Ghoniem, N. M.
Object Type:
Report
System:
The UNT Digital Library
Two-stage regeneration of zinc ferrite desulfurization sorbent
The Morgantown Energy Technology Center (METC) of the US Department of Energy (DOE) is interested in the potential of using a two-step process for regenerating the zinc ferrite desulfurization sorbent. In the first regeneration step, a gas mixture consisting of 12 percent SO{sub 2}, 2 percent O{sub 2}, and 86 percent N{sub 2} is used to convert zinc and iron sulfides to their sulfate forms using a sorbent bed inlet temperature of about 850{degrees}F (454{degrees}C). For the second step, the temperature is raised to about 1400{degrees}F (760{degrees}C), and the sulfates are decomposed to oxides with the concurrent release of sulfur dioxide. The same gas composition used for first step is also used for the second step. The proposed technique would require no steam and also has the advantage of producing a regeneration gas rich in sulfur dioxide. In a commercial operation, recirculating regeneration gas would be supplemented with air as required to supply the necessary oxygen. A bleed stream from regeneration (concentrated SO{sub 2} gas in nitrogen) would constitute feed to sulfur recovery.
Date:
June 28, 1988
Creator:
Jha, M. C. & Berggren, M. H.
Object Type:
Report
System:
The UNT Digital Library
Types of Committee Hearings
This report describes the four types of congressional committee hearings; legislative, oversight, investigative, and confirmation and the rules governing them.
Date:
June 28, 2017
Creator:
Heitshusen, Valerie
Object Type:
Report
System:
The UNT Digital Library