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Porous graphite air-bearing components as applied to machine tools
None
Date:
January 1, 1974
Creator:
Rasnick, W. H.; Arehart, T. A.; Littleton, D. E. & Steger, P. J.
Object Type:
Article
System:
The UNT Digital Library
Studies of photosynthetic energy conversion. Comprehensive three-year report, September 1, 1972--August 31, 1975
None
Date:
January 1, 1975
Creator:
Clayton, R. K.
Object Type:
Report
System:
The UNT Digital Library
Defects in metal crystals. Progress report, May 1, 1973--April 30, 1974
Progress was made in the following areas: FIM (field ion microscopy) studies of defects in W irradiated with W ions or electrons; FIM studies of Au irradiated with Au or Xe ions; FIM and electrical resistivity study of vacancy defects in quenched W; FIM studies of dilute Pt alloys; measurement of the range of focused replacement sequences in Au; investigation of grain boundary strtucture (using Au); FIM observation of dissociated screw dislocations in Mo; calculation of properties of point defects in metals; and atom probe FIM. (auth)
Date:
January 1, 1974
Creator:
Balluffi, R.W. & Seidman, D.N.
Object Type:
Report
System:
The UNT Digital Library
Sintering of polycrystalline ionic conductors:. beta. ''-Al/sub 2/O/sub 3/ and NASICON
The densification kinetics for both ..beta..''-alumina and NASICON are dramatically different. ..beta..''-Alumina sinters by a reactive liquid process whereas NASICON densifies by a solid state method. More importantly, a qualitative examination of particle and agglomerate distributions, phase composition, linear shrinkage analysis, and heating rate effects can result in a concise determination of sintering processes without recourse to more quantitative techniques. Such a simple procedural method should be a basis for any beginning investigative study into the densification mechanism of new multicomponent ceramic materials.
Date:
January 1, 1979
Creator:
McEntire, B. J.; Miller, G. R. & Gordon, R. S.
Object Type:
Article
System:
The UNT Digital Library
Geothermal resources in California: the problems and the potential
The report is presented under the following section headings: introduction; conclusions and recommendations; legislative activity in 1973; United Nations Geothermal Conference; International Geothermal Conference--1975; National Conference on Geothermal Energy, May 10--11, Palm Springs, Calif.; Imperial Valley field trip and joint interim hearing October 16--17, 1973 (Senate Committee on Natural Resources and Wildlife on Senate Bill 577 in San Diego); hearing of the Subcommittee on Geothermal Resources and the Senate Committee on Public Utilities and Corporations, Nov. 12, 1973 in San Francisco (public access to steam at The Geysers); hearing of the Senate Committee on Natural Resources and Wildlife on the continued availability of natural gas and other sources of energy, Nov. 15, 1973, in Martinez, Calif; and Appendix. (JGB)
Date:
January 1, 1973
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Tumor production in Syrian hamsters following inhalation of PuO/sub 2/--ZrO/sub 2/ aerosol
Syrian golden hamsters of both sexes were exposed to aerosols of ZrO/sub 2/ containing PuO/sub 2/. The starting material in the aerosol generator also had a small amount of /sup 57/Co added as a tracer. The mixture of all three constituents was nebulized and the droplets passed through a heating column at 1000/sup 0/C. Aerosol sampling was accomplished with a cascade impactor and electrostatic precipitator. The median aerodynamic diameters in all inhalation runs were approximately 2 ..mu..m with a geometric standard deviation of 2. One exposed group of 60 hamsters had 6-day lung burdens averaging 100 nCi. This group had a lung tumor incidence of 44% with an even distribution of adenomas and carcinomas. Two other groups had average 6-day lung burdens of 80 to 90 nCi plus 55 nCi of intravenously injected spheres localized in the lung. These animals had tumor incidences of approximately 30%.
Date:
January 1, 1978
Creator:
Thomas, R. G. & Smith, D. M.
Object Type:
Article
System:
The UNT Digital Library
Redox reactions involving chromium, plutonium, and manganese in soils
Plutonium speciation in soils is discussed. Chromium was selected as a model for studying soil Pu. Similarities between Cr and Pu are pointed out, and a hypotheses concerning Pu speciation in soils is presented. Findings from Cr oxidation studies that may be relevant to the problem of Pu oxidation in soils are discussed. (JGB)
Date:
January 1, 1979
Creator:
Amacher, M.C. & Baker, D.E.
Object Type:
Report
System:
The UNT Digital Library
/sup 16/O + /sup 40/Ca inelastic scattering and the elastic scattering wave function
The /sup 16/O + /sup 40/Ca inelastic scattering has been measured at 60-MeV incident energy, and evidence has been found in support of an explicit coupling between direct and elastic channels. The measurements were extended over a large angular range and in particular to very forward angles. The ratio of cross sections between extreme forward and backward angles proved very useful in studying the underlying reaction mechanism.
Date:
January 1, 1977
Creator:
Rehm, K.E.; Henning, W.; Erskine, J.R. & Kovar, D.G.
Object Type:
Article
System:
The UNT Digital Library
TNS Doublet tokamak ohmic-heating power supply study
Separate abstracts were prepared for each of the six included sections. (MOW)
Date:
January 1, 1978
Creator:
Rogers, J.D. (comp.)
Object Type:
Report
System:
The UNT Digital Library
Pilot plant test plan, Task IX: technical support. Industrial Low-Btu Fuel Gas Demonstration-Plant Program
The objective of the AAG pilot plant operation is to provide process data for the gasification and related sections of the demonstration plant. Since the pilot plant will not operate at the actual pressure of the demonstration plant, it is planned to perform tests at two different pressures to obtain a sound basis for pressure scale-up. Other objectives are listed briefly.
Date:
January 1, 1978
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Office of Waste Isolation progress report, December 1977
This document reports progress on the OWI's portion of the National Waste Terminal Storage (NWTS) program. It comprises project reports on work performed by organizations under subcontract to OWI, by DOE contractors, by OWI consultants, and by other federal agencies participating in the NWTS program. They are made under the headings technical projects, facility projects, planning and analysis, and regulatory affairs. (DLC)
Date:
January 31, 1976
Creator:
Zerby, C.D.
Object Type:
Report
System:
The UNT Digital Library
Cryogenic supplies for the TFTR neutral beam line cryopanels
Cryocondensing panels will be used for the Neutral Beam Lines of the TFTR to satisfy a pumping speed requirement of 2.5 x 10/sup 6/ l/s. The cryocondensing panels are fed by liquid helium (LHe), boiling at selectable temperatures of 4.5/sup 0/K or 3.8/sup 0/K. Liquid nitrogen (LN/sub 2/) panels and chevrons thermally shield the LHe panel. The closed-loop LHe supply system and the open loop LN/sub 2/ system are discussed. The helium refrigerator of minimum 1070-W capacity, together with its distribution system, and the nitrogen distribution system in the ton/hour LN/sub 2/ range is presented. Problems and their solutions in connection with the LHe system, including the distribution over a distance of 500 feet of large quantities of liquid/gas mixtures with load variations over the range of about 3 : 1, and the economies of various types of distribution lines (passive, pumped, shielded, combined), are described. The system design passed the preliminary phase. Design features and auxiliary equipment to assure dispersion of large quantities of nitrogen into the atmosphere and to permit operation under degraded cryogenic helium refrigerator performance are also discussed in Design Considerations.
Date:
January 1, 1977
Creator:
Pinter, G.
Object Type:
Article
System:
The UNT Digital Library
TCT hybrid preconceptual blanket design studies
The conceptual design of a tokamak fusion-fission (hybrid) reactor, which produces electric power and fissile material, has been performed in a cooperative effort between Princeton's Plasma Physics Laboratory (PPPL) and Battelle's Pacific Northwest Laboratories (PNL). PPPL, who had overall project lead responsibility, designed the fusion driver system. Its core consists of a tokamak plasma maintained in the two-component torus (TCT) mode by both D and T beams and having a single null poloidal divertor. The blanket concept selected by PPPL consists of a neutron multiplying converter region, containing natural Uranium Molybdenum (U-Mo) slugs followed by a fuel burning blanket region of molten salt containing PuF/sub 3/. PNL analyzed this concept to determine its structural, thermal and hydraulic performance characteristics. An adequate first wall cooling method was determined, utilizing low pressure water in a double wall design. A conceptual layout of the converter region tubes was performed, providing adequate helium cooling and the desired movement of U-Mo slugs. A thermal hydraulic analysis of the power-producing blanket regions indicated that either more helium coolant tubes are needed or the salt must be circulated to obtain adequate heat removal capability.
Date:
January 1, 1978
Creator:
Aase, D. T.; Bampton, M. C. C.; Doherty, T. J.; Leonard, B. R.; McCann, R. A.; Newman, D. F. et al.
Object Type:
Report
System:
The UNT Digital Library
Thorium fuel cycles for LWRs: fuel diversion assessments and recycle requirements
A number of fuel cycles have been proposed for evaluation in the nonproliferation alternative systems assessment program. Among these systems are light water reactors (LWR) operating on the thorium-uranium cycle or the plutonium-thorium cycle either inside or outside energy centers. These proposals support the President's nuclear power policy of accelerating research into alternative fuel cycles that do not permit direct access to materials usable for nuclear weapons but still retain the benefits of nuclear power. Reprocessing and refabrication (often referred to as the ''back cycle'') constitute a portion of the overall fuel cycle and represent potential access points to fissionable materials, which, in many cases, may be in a rather attractive form for diversion. These operations for LWR thorium-uranium and plutonium-thorium fuels were analyzed to assess and rate the diversion or proliferation potential of each major operation. Reprocessing and refabrication evaluations per se constitute insufficient data for rating the acceptability of an entire fuel cycle and must be considered along with reactor analysis, environmental data, resource utilization, and political factors. Each back cycle operation has been evaluated according to needed development, material location, material description, convertibility and radiation hazard. Needed development relates to the state of the art of the …
Date:
January 1, 1978
Creator:
Carter, W. L.; Rainey, R. H. & Johnson, D. R.
Object Type:
Article
System:
The UNT Digital Library
First order study for an iron core OH system for TNS
A simple comparison has been made between an air core and an iron core ohmic heating system for a particular device, and it was shown that the peak power requirements can be substantially reduced by the use of an iron core to power levels handled by industry today. It was also shown that for an ohmic heating system initiated plasma that the cost of the iron core ohmic heating power system (iron core, dual rectifier, and DC switch) is less than the cost for a subset of the power system for an air core system (dual rectifier and DC switch). There is considerable work being done on other methods of initiating the plasma none of which seem to be incompatible with the use of an iron core system.
Date:
January 1, 1977
Creator:
Ballou, J. K. & Schultz, J.
Object Type:
Article
System:
The UNT Digital Library
Experimental program to validate analyses of accelerator breeder concepts
The concept of using high-energy particle accelerators to produce neutrons for converting fertile material to fissile is over 25 years old. It is only relatively recently that accelerator design has progressed to a point where the operation approaches commercial viability. Critical unknowns in the concept were identified in a detailed study of specic configurations. Experiments to elucidate these unknowns in a timely manner using existing material and facilities are defined and identified. Basic measurements are described to evaluate effects of the primary particle beam and resulting secondary particles in massive assemblies of most materials of interest.
Date:
January 1, 1977
Creator:
Talbert Jr., W. L.; Russell, G. J. & Malenfant, R. E.
Object Type:
Article
System:
The UNT Digital Library
Thermal properties. Period covered, April--June 1975. [Chemical reactivity data for PBX 9404 and PETN, chemical explosives]
None
Date:
January 1, 1975
Creator:
Myers, L.C.
Object Type:
Report
System:
The UNT Digital Library
X-ray measurements of stresses and defects in EFG and large grained polycrystalline silicon ribbons. First quarterly report
The first model of a modified Bond goniometer has been built and tested for the precision measurement of interplanar spacings in Si-single crystals. A change in interplanar spacing ..delta..d/d approximately = to +- 10/sup -5/ can be detected which corresponds to surface stresses of the order of +- 1000 psi. A second version of the goniometer is being assembled incorporating a removable microscope for precision alignment of the Si-strip into the primary X-ray beam.
Date:
January 1, 1978
Creator:
Wagner, C.N.J.
Object Type:
Report
System:
The UNT Digital Library
Effect of hydrogen on metals. [Causes, mechanisms, and prevention; 59 refs]
None
Date:
January 1, 1974
Creator:
Louthan, M. R., Jr.
Object Type:
Report
System:
The UNT Digital Library
Measurement of energy loss in the region of relativistic rise for particle identification
The following boundary conditions are desirable for particle detectors providing momentum and mass measurement in a magnetic field. A multilayer drift chamber of the socalled ''bicycle'' type with a radius of 1.5 m is considered. The useful track length will be l/sub min/ = 1.3 m for a straight track at 90/sup 0/ to the beam axis. Two examples for possible subdivisions of this volume are chosen: (1) number of layers, n = 200 and thickness/layer, x = 6.5 mm; and (2) n = 56 and x = 23 mm. An analysis is given in which the counting gas, the pressure, and the maximum allowable particle rate are considered as variables.
Date:
January 1, 1977
Creator:
Fischer, J.; Okuno, H. & Walenta, A.H.
Object Type:
Article
System:
The UNT Digital Library
Development of methods and procedures for high rate low energy expenditure fabrication of solar cells. Quarterly progress report No. 1, September 27--December 31, 1975
The objective of this program is to develop high rate, energy efficient solar cell processing techniques based around ion implantation and elimination of all conventional thermal operations. Cells have been fabricated using an abbreviated series of vacuum process operations performed at room temperature. (auth)
Date:
January 1, 1976
Creator:
Kirkpatrick, A. R. & Minnucci, J. A.
Object Type:
Report
System:
The UNT Digital Library
Conceptual design of a superconducting magnet coil for the large coil program. [Flat-wound NbTi coils]
A conceptual design for a toroidal field (TF) coil for a six coil test array has been developed. The electromagnetic, cryogenic, structural, manufacturing, quality assurance and verification testing requirements have been analyzed. The bore is oval shaped and is 2.35 meters horizontally and 3.35 meters vertically. The coil is designed to operate at 8T peak field at rated current of 10450 amperes when the other 5 coils in the toroidal array are at 80% rated current. Using-flat-wound NbTi conductor this pool-boiling, pancake wound coil is fully cryostable, and is enclosed in a 316LN stainless steel coil structure and helium container capable of supporting all expected in-plane loads and out-of-plane loads due to pulsed fields and unsymmetrical current distributions in the other 5 coils.
Date:
January 1, 1977
Creator:
Quay, R.; Bryant, R. W.; Koenig, R. F.; Ferrante, J. J.; Linkinhoker, C. L.; Donato, J. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Non-linear numerical studies of the tearing mode
A non-linear, time dependent, hydromagnetic model is developed and applied to the tearing mode, one of a class of instabilities which can occur in a magnetically confined plasma when the constraint of infinite conductivity is relaxed. The model is based on the eight partial differential equations of resistive magnetohydrodynamics (MHD). The equations are expressed as a set of conservation laws which conserves magnetic flux, momentum, mass, and total energy. These equations are then written in general, orthogonal, curvilinear coordinates in two space dimensions, so that the model can readily be applied to a variety of geometries. No assumption about the ordering of terms is made. The resulting equations are then solved by the method of finite differences on an Eulerian mesh. The model is applied to several geometries.
Date:
January 1, 1978
Creator:
Schnack, D.D. Jr.
Object Type:
Report
System:
The UNT Digital Library
Simulation of chlorinated water discharges from power plants on estuaries and rivers
The fast-transient (tidal-transient) one-dimensional discrete-element chemical transport model and its associated computer code CHMONE were applied to study the effects of chlorinated water discharges from power plants on tidal estuaries and controlled rivers. The mathematical model has the capability to predict simultaneously the hydrodynamic, thermal, and chemical composition of water as one-dimensional time-dependent distributions. (LTW)
Date:
January 1, 1977
Creator:
Eraslan, A. H.; Lietzke, M. H.; Fischer, S. K. & Kalmaz, E. V.
Object Type:
Article
System:
The UNT Digital Library