Collection
Office of Scientific & Technical Information Technical Reports
3,019
Congressional Research Service Reports
1,392
Texas Patents
636
Texas Attorney General Opinions
591
Defense Base Closure and Realignment Commission
538
Government Accountability Office Reports
406
Technical Report Archive and Image Library
324
National Advisory Committee for Aeronautics Collection
193
Texas Register
123
TRAIL Microcard Collection
104
17 More
Country
States
Decade
Month
Day
Language
7,259 Matching Results
Results open in a new window/tab.
Urban Options Solar Greenhouse Project. Semi-annual technical progress report
The design changes and construction of the Urban Options Solar Greenhouse are described. The greenhouse performance and horticultural and educational activities are discussed. (MHR)
Date:
March 13, 1980
Creator:
Cipparone, L.
Object Type:
Report
System:
The UNT Digital Library
Annular air space effects on nuclear waste canister temperatures in a deep geologic waste repository
Air spaces in a deep geologic repository for nuclear high level waste will have an important effect on the long-term performance of the waste package. The important temperature effects of an annular air gap surrounding a high level waste canister are determined through 3-D numerical modeling. Air gap properties and parameters specifically analyzed and presented are the air gap size, surfaces emissivity, presence of a sleeve, and initial thermal power generation rate; particular emphasis was placed on determining the effect of these variables have on the canister surface temperature. Finally a discussion based on modeling results is presented which specifically relates the results to NRC regulatory considerations.
Date:
May 13, 1980
Creator:
Lowry, W.E.; Cheung, H. & Davis, B.W.
Object Type:
Report
System:
The UNT Digital Library
Radiation Laboratory, University of Notre Dame. Quarterly report, July 1, 1977--September 30, 1977. [Short summaries of progress in 27 projects]
Status of the following investigations is given: effect of molecular geometry on the electron affinity of H/sub 2/O; effect of non-spherically symmetric exchange potential in energy transfer and CIDEP; fragmentation patterns in the radiolysis of normal alkanes; properties of solvated electrons; temperature dependence of electron localization and impurity trapping in methanol and propanol; field-dependent electron mobility; aluminium cluster and organoaluminum systems; collision-induced atomic dipole moments; T-R energy transfer between electronically excited atoms and ground state molecules; correlation between the anisotropy of polarizability and electron-density contour diagrams; high-field conduction in thin-film alkali halides; chemically induced electron polarization of t-butyl radicals in solution; nonlinear response of radical systems to modulated initiation; measurement of electron spin-lattice relaxation times; electron attachment to N/sub 2/O in the gas phase; laser fluorescence of cyclohexadienyl radical in irradiated benzene crystals; kinetics of radical exchange between micelles and water; dynamics of probe molecules in a micellar environment; radiolytic reduction of colloidal silver bromide; characterization of structure in fatty acid aggregate systems; photochemical reactions of Cu(II) complexes with macrocyclic ligands; studies of Ni(III) macrocyclic complexes; rateconstant for oxidation of hydroxycyclohexadienyl radical by ferricyanide; alkoxyl radical reactions with lipids; luminescence from diarylcarbenes; excited-state reactions of 7-hydroxy-4-methyl coumarin; photochronic aziridines; and …
Date:
October 13, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Neutral beam injector for 475 keV MARS sloshing ions
A neutral beam injector system which produces 5 MW of 475 keV D/sup 0/ neutrals continuously on target has been designed. The beamline is intended to produce the sloshing ion distribution required in the end plug region of the conceptual MARS tandem mirror commercial reactor. The injector design utilizes the LBL self-extraction negative ion source and Transverse Field Focusing (TFF) accelerator to generate a long, ribbon ion beam. A laser photodetachment neutralizer strips over 90% of the negative ions. Magnetic and neutron shield designs are included to exclude the fringe fields of the end plug and provide low activation by the neutron flux from the target plasma. The use of a TFF accelerator and photodetachment neutralizer produces a total system electrical efficiency of about 63% for this design.
Date:
December 13, 1983
Creator:
Goebel, D.M. & Hamilton, G.W.
Object Type:
Report
System:
The UNT Digital Library
A fast large-area position-sensitive time-of-flight neutron detection system
A new position-sensitive time-of-flight neutron detection and histograming system has been developed for use at the Intense Pulsed Neutron Source. Spatial resolution of roughly 1 cm {times} 1 cm and time-of-flight resolution of {approximately}1 {mu}sec are combined in a detection system which can ultimately be expanded to cover several square meters of active detector area. This system is based on the use of arrays of cylindrical one-dimensional position-sensitive proportional counters, and is capable of collecting the x-y-t data and sorting them into histograms at time-averaged data rates up to {approximately}300,000 events/sec over the full detector area and with instantaneous data rates up to more than fifty times that. Numerous hardware features have been incorporated to facilitate initial tuning of the position encoding, absolute calibration of the encoded positions, and automatic testing for drifts. 7 refs., 11 figs., 1 tabs.
Date:
October 13, 1989
Creator:
Crawford, R.K. & Haumann, J.R.
Object Type:
Article
System:
The UNT Digital Library
Conceptual design study on incorporating a 25-ton/day pyrolysis unit into an operating total energy system. Final report
The results of a conceptual design study on incorporating a pyrolysis unit into an existing total energy plant are presented. The objectives of this study were to examine the institutional, technical and economic factors affecting the incorporation of a 25-ton/day pyrolysis unit into the Indian Creek Total Energy Plant. The Indian Creek total energy plant is described. Results of the conceptual design are presented. A survey of the availability of waste materials and a review of health and safety ordinances are included. The technical aspects of the pyrolysis system are discussed, including the results of the review of facilities requirements for the pyrolysis unit, the analysis of necessary system modification, and an estimate of the useful energy contribution by the pyrolysis unit. Results of the life-cycle cost analysis of the pyrolysis unit are presented. The major conclusions are that: there appears to be no institutional or technical barriers to constructing a waste pyrolysis unit at the Indian Creek Total Energy Plant; pyrolysis gas can be consumed in the engines and the boilers by utilizing venturi mixing devices; the engines can consume only 5% of the output of the 25-ton/day pyrolysis unit; Therefore, consumption of pyrolysis gas will be controlled by …
Date:
December 13, 1976
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Steering system for a train of rail-less vehicles
A steering system for use with a multiple vehicle train is disclosed which permits tracking without rails of one vehicle after another. This system is particularly useful for moving conveyor systems into and out of curved paths of room and pillar underground mine installations. The steering system features an elongated steering bar pivotally connected to each of adjacent vehicles at end portions of the bar permitting angular orientation of each vehicle in respect to the steering bar and other vehicles. Each end portion of the steering bar is linked to the near pair of vehicle wheels through wheel yoke pivot arms about king pin type pivots. Movement of the steering bar about its pivotal connection provides proportional turning of the wheels to effect steering and tracking of one vehicle following another in both forward and reverse directions.
Date:
March 13, 1981
Creator:
Voight, Edward Theodore
Object Type:
Patent
System:
The UNT Digital Library
Review of free electron laser theory and experiments
A review of the major Free Electron Laser (FEL) experiments will be presented. These experiments are designed to produce radiation at wavelengths from the far infrared to the ultraviolet. Different categories of FELs (Compton, Raman, optical klystron, two stage, etc.), as well as the suitability of various types of electron accelerators to power FELs, will also be discussed. Potential applications of the FEL will be summarized.
Date:
January 13, 1984
Creator:
Prosnitz, D.
Object Type:
Article
System:
The UNT Digital Library
THE SUBCRITICAL REACTOR WITH SOURCES
The mathematical formulation of the subcritical reactor with extraneous sources is presented in detail. The solutions are presented for a two-group approximation including epithermal fission and the relationship to the usual critical reactor problem is discussed. Application of the equations to an arbitrarily complicated geometry is outlined, and an IBM-7090 program for the solution in a bare cylindrical reactor is described. (auth)
Date:
March 13, 1962
Creator:
Preskitt, C.A.
Object Type:
Report
System:
The UNT Digital Library
Electromagnetic Effects in Relativistic Electron Beam Plasma Interactions
Electromagnetic effects excited by intense relativistic electron beams in plasmas are investigated using a two-dimensional particle code. The simulations with dense beams show large magnetic fields excited by the Weibel instability as well as sizeable electromagnetic radiation over a significant range of frequencies. The possible relevance of beam plasma instabilities to the laser acceleration of particles is briefly discussed. 6 refs., 4 figs.
Date:
February 13, 1985
Creator:
Kruer, W. L. & Langdon, A. B.
Object Type:
Article
System:
The UNT Digital Library
Thermal properties measurements on rocksalt samples from the site of the proposed Waste Isolation Pilot Plant
Thermal conductivity, thermal expansion, and specific heat measurements have been made on a number of specimens. The specific heat measurements were made by differential scanning calorimetry and the results showed that the specific heats of both clean rocksalt samples and of dirty samples with less than or equal to 7% insoluble impurities were essentially identical to the published specific heat for pure NaCl. In the thermal expansion measurements, two distinct groups of samples were identified. The first group had average expansion coefficients in the temperature range 300 to 700/sup 0/K close to that reported for pure NaCl. All the samples in this group were composed predominantly of halite, with only small amounts of other minerals or materials present. A second group of samples had expansion coefficients only approx. 0.3 to 0.5 that of NaCl. The samples in this group were composed largely of polyhalite, anhydrite, or siltstone. The measurements first reported by Acton on the thermal conductivity of samples taken from a borehole at the site of the proposed nuclear waste isolation pilot plant (WIPP) near Carlsbad, NM, have been extended to include additional samples and higher temperature measurements. This is not believed to be the result of the onset …
Date:
May 13, 1980
Creator:
Sweet, J. N. & McCreight, J. E.
Object Type:
Report
System:
The UNT Digital Library
ITER disruption modeling using TSC (Tokamak Simulation Code)
Design of the ITER vacuum vessel (VV) is driven strongly by disruption-induced forces. We use the Tokamak Simulation Code (TSC) to model disruptions for the ITER physics phase (I{sub p} = 22 MA) and predict the time evolution of currents and forces on the VV. For a plasma vertically displaced to Z{sub axis} = {minus}1.0m before disruption and decaying at a rate of < dI{sub p}/dt > {approx equal} {minus}1.0MA/ms, the induced VV current peaks at 18 MA. The maximum radial VV force F{sub R} is 56 MN/rad; the maximum vertical force F{sub Z} is 5.4 MN/rad; and the maximum VV disruption pressure is 1.0 MPa. Variations in VV resistance (20 - 160 {mu}{Omega}) and < dI{sub p}/dt > (1 - 2.5 MA/ms) do not change F{sub R} significantly. The dependence of the forces on the initial plasma displacement and < dI{sub p}/dt > behavior, and the responses of other conducting structures are discussed. 2 refs., 6 figs.
Date:
November 13, 1989
Creator:
Sayer, R. O.; Peng, Y. K. M.; Wesley, J. C.; Jardin, S. C. (Oak Ridge National Lab., TN (USA); General Atomics, San Diego, CA (USA) & Princeton Univ., NJ (USA). Plasma Physics Lab.)
Object Type:
Article
System:
The UNT Digital Library
Early identification of technical issues: a sensitivity study to check LISTRA1A internal consistency and structure
This report describes a sensitivity study using LISTRA1A, a model for use in the development of a long-range, time-dependent plan for licensing nuclear waste repositories. The objectives of the model are: (1) to provide information concerning the impact of various licensing strategies on the ability to dispose of nuclear waste effectively; and (2) to provide long-range budget forecasts for differing strategies of the Nuclear Regulatory Commission (NRC) and the Department of Energy (DOE). The model is designed to analyze the interaction between NRC regulatory policy and DOE technical programs. A sensitivity study is reported for a single parameter in a hypothetical review process.
Date:
December 13, 1979
Creator:
Harvey, T. F.; Maninger, R. C. & Rabsatt, S.
Object Type:
Report
System:
The UNT Digital Library
Modeling beam-front dynamics at low gas pressures
The dynamics of space charge neutralization at the front of an intense self-focused electron beam pulse exhibits important differences in different gas pressure regimes. At very low pressures, the beam front is in the so-called ion-focused regime (IFR) where all secondary electrons are expelled from the beam region by the radial electric field without causing significant additional ionization. We estimate the upper pressure boundary of this regime by considering the distance scale length for cascade (avalanche) ionization. Data from the FX-25 diode experiments indicate a critical transition pressure (P/sub c/) that agrees with this estimate and with its scaling among various gas types. Normal mobility-limited treatments (local conductivity models) of the secondary electrons at the beam front are not justified until the gas pressure is 10 to 50 times higher than P/sub c/, due to runaway of these secondary electrons in the strong space-charge electric field at the lower pressures. The main conclusion of this study is that a non-local phase space (Boltzmann) treatment of the secondary electrons is required to accurately describe these different beam front regimes and the transitions between them; such a code model is currently under development.
Date:
May 13, 1982
Creator:
Briggs, R. J. & Yu, S.
Object Type:
Report
System:
The UNT Digital Library
L-shell photoabsorption spectroscopy for solid metals: Ti, V, Cr, Fe, Ni, Cu
Synchrotron radiation measurements of near-threshold and broad-range (400--1500 eV) absolute photoabsorption cross sections were made for five transition metals with {plus minus}10% overall uncertainties. Fine structure details of 2p-3d autoionizing resonances are shown with better than 1.0 eV resolution for solid metals: Ti, V, Cr, Fe, Ni, and Cu. Fine structure similar to what we measured can be produced using a multi-configuration Dirac Fock (MCDF) model if a statistical distribution is assumed for the initial atomic states. Calculations were performed in intermediate coupling with configuration interactions by Mau H. Chen. The results are compared with other experimental work and theoretical methodologies. 18 refs., 7 figs.
Date:
September 13, 1989
Creator:
Del Grande, N.K. (Lawrence Livermore National Lab., CA (USA))
Object Type:
Article
System:
The UNT Digital Library
CRITICALITY EXCURSION OF NOVEMBER 10, 1961
A criticality excursion occurred at the Oak Ridge Critical Experiments Laboratory on November l0, l961 as enriched uranium metal, neutron reflected and moderated by hydrogen, was being assembled. It is estimated that the energy yield was between 10/sup 15/ and 10/sup 16/ fissions. There was no personnel exposure or property damage. Fission product contamination, both airborne and contained in the metal, decayed sufficiently overnight to allow unhindered continuation of the experiment. The excursion was caused by a too rapid approach of the two sections of uranium constituting the experiment. (auth)
Date:
February 13, 1962
Creator:
Callihan, D.
Object Type:
Report
System:
The UNT Digital Library
Technical evaluation report on the proposed design modifications and technical specification changes on grid voltage degradation for the Millstone Nuclear Power Station, Unit 1
This report documents the technical evaluation of the proposed design modifications and Technical Specification change for protection of Class 1E equipment from grid voltage degradation for the Millstone Nuclear Power Station, Unit 1. The review criteria are based on several IEEE standards and the Code of Federal Regulations. The evaluation finds that the licensee has not provided sufficient information on the undervoltage protection system to allow a complete evaluation into the adequacy of protecting the Class 1E equipment from sustained voltage degradation.
Date:
May 13, 1982
Creator:
Selan, J.C.
Object Type:
Report
System:
The UNT Digital Library
STATUS REPORT NO. 2 ON CLINCH RIVER STUDY
None
Date:
April 13, 1962
Creator:
Morton, R.J. ed.
Object Type:
Report
System:
The UNT Digital Library
Research and Development Activities Fixation of Radioactive Residues Quarterly Progress Report, July-September 1961
Progress is reported on research and development work in pot calcination and radiant-heat spray calcination studies of synthetic Purex high-level wastes; and sorption studies using synthetic minerals and resins as well as natural minerals. The calcination studies are discussed in terms of batch calcination, melting of pot calcination products, spray calcination, and off-gas treatment; and sorption studies in terms of mineral reactions, fixation chemistry, and condensate wastes. (B.O.G.)
Date:
October 13, 1961
Creator:
Irish, E.R. ed.
Object Type:
Report
System:
The UNT Digital Library
Field electrochemical measurements of corrosion characteristics of materials in hypersaline geothermal brine
A flow cell (with appropriate accessories) was developed for use in short-term testing of the corrosion behavior of materials in approximately 100{sup 0}C, hypersaline geothermal brine. The apparatus was designed to accommodate commercial (Petrolite) corrosion measurement equipment and conducted experiments on-line at the Lawrence Livermore Laboratory Test Station in the Salton Sea Geothermal Field. The apparatus also permitted direct readings of corrosion potentials, solution redox potential (E{sub h}), brine flow rate, pH, and temperature. Estimates of general corrosion rates were obtained by the linear polarization resistance technique and from measurements of complete potentiodynamic polarization curves. The latter also afforded predictions of pitting susceptibilities of active-passive type materials. Twenty-two alloys (with various heat treatments) were tested and readily grouped according to general corrosion resistances in acidified hypersaline (approximately 4 M chloride) brine. Especially promising in regard to corrosion resistance-vs-cost is the series of low Cr--Mo steels. Prescaling of materials in unacidified (pH approximately 5.7) brine prior to exposure to acidified (pH 2 to 4.5) brine was found to be beneficial in reducing corrosion rates at 100{sup 0}C.
Date:
December 13, 1977
Creator:
Harrar, J.E.; McCright, R.D. & Goldberg, A.
Object Type:
Report
System:
The UNT Digital Library
MEASUREMENT OF THE VAPOR PRESSURE OF TBP
Two methods, the transpiration and direct P/sup 32/ counting methods, were tested for use in measuring the vapor pressure of TBP. With the transpiration technique, measured TBP vapor pressures were sufficiently reproducible, and probably of sufficient accuracy, to warrant improvement of the apparatus and its use in measuring the vapor pressure of TBP over various TBP- diluent-HNO/sub 3/-H//sub 2/O-UO/sub 2/ (NO/sub 3/)sub 2 solutions. With this method the vapor pressure of TBP containing 0.2 wt% H/sub 2/O was determined to be ~0.8 mu while that of TBP saturated with H/sub 2/O, ~6.5 wt% H/sub 2/O, was ~ 0.5l mu . The direct P/sup 32/counting technique was abandoned because of experimental difficulties. (auth)
Date:
December 13, 1961
Creator:
Faure, A. & Davis, W. Jr.
Object Type:
Report
System:
The UNT Digital Library
Neutral beamline with improved ion-energy recovery
A neutral beamline employing direct energy recovery of unneutralized residual ions is provided which enhances the energy recovery of the full energy ion component of the beam exiting the neutralizer cell, and thus improves the overall neutral beamline efficiency. The unneutralized full energy ions exiting the neutralizer are deflected from the beam path and the electrons in the cell are blocked by a magnetic field applied transverse to the beam direction in the neutralizer exit region. The ions which are generated at essentially ground potential and accelerated through the neutralizer cell by a negative acceleration voltage are collected at ground potential. A neutralizer cell exit end region is provided which allows the magnetic and electric fields acting on the exiting ions to be loosely coupled.
Date:
April 13, 1981
Creator:
Kim, J.
Object Type:
Patent
System:
The UNT Digital Library
The production of sulfate particles through the radiolytic oxidation of sulfur dioxide
The production of hydroxyl radicals by the radiolytic decomposition of water vapor following alpha decay of {sup 222}Rn can be used to produce an ultrafine sulfuric acid aerosol in the presence of SO{sub 2}. In the past, the production of this aerosol appeared to have a limiting threshold in as much as sufficient conversion of SO{sub 2} to SO{sub 4} must be attained to achieve the concentration required for nucleation. This appeared to occur when the bulk average acidity reached an adequately high value. The threshold curve for the onset of the sulfuric acid aerosol formation is a function of the H{sub 2}O, SO{sub 2} and Rn concentrations. The hydroxyl radical formation is dependent on the H{sub 2}O and Rn concentrations. The mass conversion rate of SO{sub 2} to H{sub 2}SO{sub 4} has been studied by measuring the airborne H{sub 2}SO{sub 4} concentration by ion chromatography after it has been collected on a filter and leached into solution. 39 refs., 9 figs.
Date:
September 13, 1991
Creator:
Karpen-Hayes, K.
Object Type:
Report
System:
The UNT Digital Library
TWENTY-FIVE GROUP REACTOR NUCLEAR DATA TAPE NEUTRON CROSS SECTIONS
A compilation is presented, in the twenty-five group Reactor Nuclear Data Tape format, of neutron cross sections for elements of major interest for GE- ANPD reactor analysis. The tabulated data are a reproduction of neutron cross section information contained on the Reactor Nuclear Data Tape, which was recently prepared. A brief outline of methods used in processing of the cross sections is also included. (auth)
Date:
June 13, 1961
Creator:
Zwick, J. W. & Kostigen, T. J.
Object Type:
Report
System:
The UNT Digital Library