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685
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575
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216
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121
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98
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9,451 Matching Results
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Computational complexity in multidimensional neutron transport theory calculations. Final report
Research to establish a general method to assess the performance and reliability of computer codes for the numerical approximation of linear operators is reported. The neutron transport operator was chosen as model. The general approach to solving the error problem and the use of benchmarks are sketched. This report contains only a brief administrative summary; references are given to forty reports and publications that contain detailed information. (RWR)
Date:
December 1, 1979
Creator:
Bareiss, E. H.
Object Type:
Report
System:
The UNT Digital Library
Theoretical aspects of solid state reactions in a mixed particulate ensemble and kinetics of lead zirconate formation
A theoretical analysis was carried out to estimate the quasi-steady-state external mass transport by lattice, surface and gaseous diffusion in terms of the stereologically measurable microstructural parameters of a mixed powder compact. It was shown that the gaseous transport can be described by a single dimensionless quantity termed sublimation transport modulus. Using these equations, the relative importance of the alternate external transport modes can be evaluated. Experimental work determined the reaction isotherms for the formation of lead zirconate from yellow PbO and monoclinic zirconia between 710/sup 0/C to 810/sup 0/C for two zirconia size distributions. The larger zirconia showed diffusion controlled shrinking core kinetics up to about 90 percent reaction while the smaller zirconia indicated a diffusion controlled spherical growth of up to 85 percent reaction after an instantaneous nucleation at a limited number of sites. The difference was attributed to the differences in the mixing time and not to the particulate sizes. It was observed that for the same size range, a longer mixing operation gave a better dispersion of reactants which resulted in a higher nucleation site density required for a shrinking core type of product morphology and faster kinetics. A microprobe profile analysis of partially reacted particles …
Date:
September 1, 1979
Creator:
Chandratreya, S.S.
Object Type:
Report
System:
The UNT Digital Library
Review of Gaussian diffusion-deposition models
The assumptions and predictions of several Gaussian diffusion-deposition models are compared. A simple correction to the Chamberlain source depletion model is shown to predict ground-level airborne concentrations and dry deposition fluxes in close agreement with the exact solution of Horst.
Date:
January 1, 1979
Creator:
Horst, T.W.
Object Type:
Article
System:
The UNT Digital Library
Evaluation of the solar building, Albuquerque, New Mexico. Final report, April 1974-September 1978
During portions of the 1974-1975 and 1975-1976 winter heating seasons, a field evaluation was made of a solar-assisted heat pump heating system in a small commercial office building in Albuquerque, N.M. The system was comprised of one main water-to-water heat pump and five small water-to-air heat pumps. The liquid-type solar collector array had an area equivalent to about 10% of the building floor area. Other than the ethylene glycol/water solution circulated through the solar collector array, water was used in all parts of the system, including three thermal energy storage tanks. Considerable information concerning this project has been disseminated through conferences, workshops, technical papers at professional society meetings, reports to the federal government and Master of Science theses, all of which are referenced in this report. The work done on this project over the period of the contract is summarized and pertinent information concerning the building, the solar-assisted heat pump system, data acquisition aspects, results, and conclusions are included.
Date:
December 1, 1979
Creator:
Gilman, S.F.
Object Type:
Report
System:
The UNT Digital Library
Detectors for radiation dosimetry
For our purposes in this review, we note the following points: (1) for charged particle detection, these counters can be filled with any noble gas-quenching gas mixture that produces satisfactory electrical signals; (2) neutron counters, in which the neutrons are detected by their interaction with the specific filling of the chamber to yield an ionizing particle, require special gas mixtures containing /sup 3/He or BF/sub 3/, an alternative approach is to coat the inner surface of the cathode with a boron or lithium compound; (3) proportional counters are used if there is any need to discriminate between different types of radiation incident on the chamber by the magnitude of the ionizing energy retained within the sensitive volume of the counter; (4) proportional counters can operate at higher speeds than Geiger counters, typically up to 10/sup 7/ cts/sec versus less than 10/sup 5//sec for the Geiger counters; and (5) Geiger counters produce very large uniform pulses which can be scaled by very simple electronics, hence, they are often used in survey meters and other portable monitoring instruments.
Date:
September 1, 1979
Creator:
Perez-Mendez, V.
Object Type:
Article
System:
The UNT Digital Library
Secondary defects in quenched platinum
The structure of secondary defects in two different platinum purities quenched under ultra high vacuum, has been studied by transmission electron microscopy. Faulted loops on (100) planes have been observed in both materials. In the less pure platinum, Pt B (but purer in terms of carbon content), the defects were observed after quenching, whereas in the purest one, Pt A (but less pure in terms of carbon content), the defects were formed after a long annealing. The Burgers vector of the loops formed after the quenching was a/3 <100> and for loops formed during long annealings, was a/2 <100>, apparently. It was found that in Pt B the loop density increased and the loop size decreased as the quenching temperature was lowered.The same effect was produced by increasing the carbon content by a small amount. The loop formation was totally inhibited by adding a larger amount of carbon and also when the quenching was performed in poor vacuum (approx. 0.01 torr) or in air. The defects can be interpreted as pure vacancy loops heterogeneously nucleated at carbon atom clusters or, as plate like precipitates of carbon atoms and vacancies formed by a co-precipitation mechanism. The discussion of the experimental results …
Date:
November 1, 1979
Creator:
Perez, M.I.
Object Type:
Report
System:
The UNT Digital Library
Development and evaluation of die and container materials. Final report
Specific compositions of high purity silicon aluminum oxynitride (Sialon) and silicon beryllium oxynitride (Sibeon) solid solutions are shown to be promising refractory materials for handling and manipulating solar grade silicon into silicon ribbon. Well controlled processing schedules were developed for fabricating high purity Sialon and Sibeon materials. Essentially the impurity content of the hot pressed ceramics was due only to impurities from the original starting powders. A ceramic shaping die was successfully formed by diamond machining of a hot pressed blank. Projected manufacturing cost estimate for 10/sup 5/ dies per year is $5.4 per die. Evaluation of the interaction of these materials in contact with molten silicon indicates that solid solutions based upon ..beta..-Si/sub 3/N/sub 4/ are more stable than those based on Si/sub 2/N/sub 2/O. Sibeon is more resistant to molten silicon attack than Sialon, and both materials should preferably be used in an inert atmosphere rather than under vacuum conditions. This is because removal of oxygen from the silicon melt as SiO enhances the dissolution of aluminum and beryllium. The wetting angles of these materials are low enough (37/sup 0/ for x = 0.75 ..beta..' Sialon and 49/sup 0/ for x = 0.35 Sibeon) for these materials to …
Date:
May 1, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Purification of phospholamban, a 22,000 dalton protein from cardiac sarcoplasmic reticulum that is specifically phosphorylated by cyclic AMP-dependent protein kinase
Very low concentrations deoxycholate (DOC) were used to isolate two proteins from canine cardiac sarcoplasmic reticulum. These two proteins are phospholamban, a 22,000 dalton protein, and the Ca/sup 2 +/ + Mg/sup 2 +/-ATPase, the major protein of the sarcoplasmic reticulum, responsible for the active transport of calcium. The 22,000 dalton protein is first solubilized in a very low concentration of DOC and then subjected to column chromatography. After molecular weight sieving on a Sephadex G-75 column, the 22,000 dalton protein appears as a purified protein on sodium dodecyl sulfate (SDS)-polyacrylamide gels. The purified protein is specifically phosphorylated by cyclic AMP-dependent protein kinase. Phospholipids are still bound to the isolated protein. The Ca/sup 2 +/ + Mg/sup 2 +/-ATPase is purified by first solubilizing all the extrinsic proteins with a low concentration of DOC. An increasing amount of DOC is then added to yield the purified Ca/sup 2 +/ + Mg/sup 2 +/-ATPase. This protein is at least 95% pure. Adding additional DOC to the purified enzyme enhances the enzyme's ability to hydrolyze ATP. (ERB)
Date:
January 1, 1979
Creator:
Bidlack, J. M. & Shamoo, A. E.
Object Type:
Report
System:
The UNT Digital Library
Thermal storage applications workshop held at Golden, Colorado, February 14-15, 1978. Volume II. Contributed papers
The 12 papers included were entered into the data base separately. (WHK)
Date:
February 15, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
INEL waste cleanup
Decommissioning and decontamination activities at the Idaho National Engineering Laboratory are discussed. The projects planned and completed are presented. Problems encountered on these projects are discussed. A developmental program is recommended. Contaminated areas consist of test reactors, reactor support facilities, a fuel reprocessing facility and various soil areas. One D and D project in 1960 occurred as a result of an accident at a low-power reactor in which 3 persons were killed, the reactor and containment building were destroyed, and large areas of land were contaminated. (DC)
Date:
January 1, 1979
Creator:
Chapin, J.A.
Object Type:
Article
System:
The UNT Digital Library
Crop residues as a fuel for power generation
Crop residues could serve as an alternative energy source for producing electric power and heat in agricultural regions of the United States. Nearly 2 quads of residues are estimated to be available as a sustainable annual yield. These can substitute for up to one quad of conventional fuels used to generate electricity and up to an additional quad of petroleum and natural gas currently used for producing heat. The most promising routes to residue conversion appear to be regional generators sized in the megawatt range, and the mixing of residues with coal for burning in coal power plants. Costing farmers from $0.70 to $1.25 per million Btu, to harvest and prepare for use as a fuel, residues can be a competitive renewable energy supply.
Date:
July 1, 1979
Creator:
Bhagat, N.; Davitian, H. & Pouder, R.
Object Type:
Report
System:
The UNT Digital Library
Aquatic microbial ecology
Individual abstracts are included in the database. (PSB)
Date:
January 1, 1979
Creator:
Colwell, R.R.; Foster, J. & Ahearn, H.L. (eds.) eds.
Object Type:
Article
System:
The UNT Digital Library
National hydroelectric power resources study. Preliminary inventory of hydropower resources. Volume 6. Northeast region
In the Northeast region, the physical potential for all sites exceeds 33,000 MW of capacity with an estimated average annual energy of some 153,000 GWH. By comparison, the available data represent about 6% of the total capacity and 11% of the hydroelectric energy potential estimated for the entire US. Of the total capacity estimated for the region, 6100 MW has been installed. The remainder (27,200 MW, excluding the undeveloped capacity in the New England States) is the maximum which could be developed by upgrading and expanding existing projects (18,700 MW), and by installing new hydroelectric power capacity at all potentially feasible, undeveloped sites (8500 MW). Small-scale facilities account for about 15% of the region's total installed capacity, but another 1800 MW could be added to these and other small water-resource projects. In addition, 500 MW could be installed at potentially feasible, undeveloped small-scale sites. The small-scale resource varies considerably, with the states of New York, Maine, and New Hampshire having the largest potential for incremental development at existing projects in the Northeast region. West Virginia, Maryland, Delaware, New Jersey, Pennsylvania, New York, Connecticut, Massachusetts, Rhode Island, New Hampshire, Vermont, and Maine comprise the Northeast region.
Date:
July 1, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Preliminary design data package. Appendix C
The design requirements, design philosophy, method and assumptions, and preliminary computer-aided design of the Near-Term Hybrid Vehicle including its electric and heat power units, control equipment, transmission system, body, and overall vehicle characteristics are presented. (LCL)
Date:
July 25, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Study of rock-water-nuclear waste interactions in the Pasco Basin, Washington. Part I. Distribution and composition of secondary and primary mineral phases in basalts of the Pasco Basin, Washington
In Part I of this report the results of Task III are presented and discussed. The subject of Task III is the study and identification of secondary and primary mineral assemblages in basalts of the Pasco Basin of southeastern Washington. In particular, we have determined the relative amounts, crystallization sequence, and compositions of secondary minerals found lining vesicle and fracture surfaces. This information, together with data on the chemical composition of primary minerals and the extent to which they have undergone dissolution, has been used in theoretical simulations of mass transfer which is the subject of Part II (Task IV) of this report.
Date:
September 1, 1979
Creator:
Benson, L. V. & Teague, L. S.
Object Type:
Report
System:
The UNT Digital Library
Natural Radioactive Isotopes of Beryllium in the Environment
Each of the papers was abstracted in dividually for ERA/EDB/INIS. (JGB)
Date:
January 1, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Potential geothermal resources in Hawaii: a preliminary regional survey. Phase I, final report
A regional geothermal resource assessment has been conducted for the major islands in the Hawaiian chain. The assessment was made through the compilation and evaluation of the readily accessible geological, geochemical, and geophysical data for the Hawaiian Archipelago that have been acquired during the last two decades. The geologic criteria used in the identification of possible geothermal reservoirs were age and location of most recent volcanism on the island and the geologic structure of each island. The geochemical anomalies used as traces for geothermally altered groundwater were elevated silica concentrations and elevated chloride/magnesium ion ratios. Geophysical data used to identify subsurface structure with possible geothermal potential were aeromagnetic anomalies, gravity anomalies, and higher-than-normal well and basal spring discharge temperatures. Geophysical and geochemical anomalies that may be the result of subsurface thermal effects have been identified on the islands of Hawaii, Maui, Molokai, and Oahu.
Date:
June 1, 1979
Creator:
Thomas, D.; Cox, M.; Erlandson, D. & Kajiwara, L.
Object Type:
Report
System:
The UNT Digital Library
Near Term Hybrid Passenger Vehicle Development Program. Phase I, Final report. Appendix C: preliminary design data package. Volume I
The assumptions made, analysis methods used, and preliminary results of research to determine the design specifications for a hybrid electric-powered and internal combustion engine-powered vehicle that would optimize the fuel economy of passenger automobiles are described. Information is included on body and component design, selection of spark-ignition engine and Ni-Zn batteries, life-cycle costs and life-cycle fuel consumption. (LCL)
Date:
July 31, 1979
Creator:
Piccolo, R.
Object Type:
Report
System:
The UNT Digital Library
Feasibility Studies of in-Situ Coal Gasification in the Warrior Coal Field. Quarterly Report
Laboratory studies on a research combustor were used in an attempt to determine the length of oxidation and reduction zones. Unfortunately the buoyant effects of the heated gases caused the burn to proceed along the upper portion of the horizontal combustor. This made the interpretation of uncertain value. Methods of measuring the thermal conductivity and chemical reactivity of coke are discussed. A bibliography of the physical and chemical properties of coke is appended. (LTN)
Date:
March 1, 1979
Creator:
Douglas, George W. & McKinley, Marvin D.
Object Type:
Report
System:
The UNT Digital Library
Nevada geothermal commercialization planning. Semi-annual progress report, January 1, 1979-June 30, 1979
Progress in planning and outreach activities needed for stimulation of the development and utilization of geothermal resources in Nevada is reviewed. (MHR)
Date:
January 1, 1979
Creator:
Jackson, K.L.; Sasek, R. & Clark, N.
Object Type:
Report
System:
The UNT Digital Library
Geopressured-geothermal energy development: government incentives and institutional structures
The following subjects are included: a geothermal resource overview, the evolution of the current Texas geopressured-geothermal institutional structure, project evaluation with uncertainty and the structure of incentives, the natural gas industry, the electric utility industry, potential governmental participants in resource development, industrial users of thermal energy, current government incentives bearing on geopressured-geothermal development, six profiles for utilization of the geopressured-geothermal resources in the mid-term, and probable impacts of new government incentives on mid-term resource utilization profiles. (MHR)
Date:
January 1, 1979
Creator:
Frederick, D.O.; Prestwood, D.C.L.; Roberts, K. & Vanston, J.H. Jr.
Object Type:
Report
System:
The UNT Digital Library
Fluid inclusions in salt from the Rayburn and Vacherie domes, Louisiana
Core samples from the Rayburn and Vacherie salt domes in Louisiana were examined for fluid inclusions, in connection with the possible use of such domes for nuclear waste storage sites. Three types of fluid inclusions were found: brine, compressed gas, and oil (in decreasing volume percent abundance). The total amount of such fluids is small, certainly < 0.01 vol % and probably in the range 0.1 to 0.001 volume %, but the inclusions are highly erratic in distribution. Unlike many bedded salt deposits, the brine inclusions in this salt contain fluids that are not far from simple NaCl-H/sub 2/O solutions, with very little of other ions. One of three possible explanations for such fluids is that fresh water penetrated the salt at some unknown time in the past and was trapped; if such entry of fresh water has occurred in the past, it might also occur again in the future.
Date:
January 1, 1979
Creator:
Roedder, E. & Belkin, H.E.
Object Type:
Report
System:
The UNT Digital Library
Recent experimental measurements of the neutrino charged current cross sections
Recent experimental measurements of the neutrino charged current total cross sections are reviewed. (GHT)
Date:
January 1, 1979
Creator:
Theriot, D.
Object Type:
Article
System:
The UNT Digital Library
Economic impact of using nonmetallic materials in low to intermediate temperature geothermal well construction
Four appendices are included. The first covers applications of low-temperature geothermal energy including industrial processes, agricultural and related processes, district heating and cooling, and miscellaneous. The second discusses hydrogeologic factors affecting the design and construction of low-temperature geothermal wells: water quality, withdrawal rate, water depth, water temperature, basic well designs, and hydrogeologic provinces. In the third appendix, properties of metallic and nonmetallic materials are described, including: specific gravity, mechanical strength properties, resistance to physical and biological attack, thermal properties of nonmetallics, fluid flow characteristics, corrosion resistance, scaling resistance, weathering resistance of nonmetallics, and hydrolysis resistance of nonmetallics. Finally, special considerations in the design and construction of low-temperature geothermal wells using nonmetallics materials are covered. These include; drilling methods, joining methods, methods of casing and screen installation, well cementing, and well development. (MHR)
Date:
December 1, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library