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281 Matching Results
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Transport and Reaction Kinetics at the Glass:Solution Interface Region: Results of Repository-Oriented Leaching Experiments
Repository-oriented leaching experiments involving Savannah River Laboratory (SRL) 165 type glass under a {gamma}-radiation field (1 = 0.2 x 10{sup 4} R/h) have been performed by the Nevada Nuclear Waste Storage Investigations (NNWSI) project. In this communication, we discuss glass surface analyses obtained by SEM, nuclear resonance profiling, and SIMS together with leachate solution data in relation to a mechanism that couples diffusion, hydrolysis (etching and gelation), and precipitation to qualitatively describe the release of different glass components to the leachant solutions. The release of mobile (e.g., Li) and partly mobile (e.g., B) species is controlled primarily by interdiffusion with water species across the interdiffusion zone. Glass components that are immobile in the interdiffusion zone are released to the solution by etching. For prediction of long-term steady-state concentrations of glass components with low solubility, the relative rates of release from the glass and secondary mineral precipitation must be taken into account.
Date:
December 31, 1986
Creator:
Abrajano, T. A., Jr. & Bates, J. K.
Object Type:
Report
System:
The UNT Digital Library
Micelle-derived catalysts for extended Schulz-Flory. [Quarterly report], April 1, 1986--June 30, 1986
The objective of this program is to develop a synthesis gas conversion catalyst with improved selectivity to gasoline or diesel range fuel via application of a micelle technique for preparing novel supported catalysts with specific size ruthenium particles. The major emphasis is to investigate hydrocarbon cutoff principle and to apply it for developing selective catalysts. We previously reported that cutoff is not effected with 40--60 {Angstrom} and 20--40 {Angstrom} ruthenium particles on {gamma}-Al{sub 2}O{sub 3}. We recently tested a catalyst with <20 {Angstrom} ruthenium particles. Well dispersed ruthenium in that catalyst extensively agglomerated to larger particles even during the course of a short test despite the high H{sub 2}:CO ratio used. Therefore, we could not conclude whether cutoff is effected with <20 {Angstrom} ruthenium particles. We are going to continue to evaluate the effect of operational conditions and also evaluate the effect of modifiers on ruthenium agglomeration. A catalyst with <20 {Angstrom} ruthenium particles will be evaluated to investigate occurrence of cutoff, after no agglomeration conditions are identified. We are now proposing to conduct, parallel to the main approach, a second research approach which will aim at developing a ruthenium catalyst with substantially lower light ends selectivity while maintaining at …
Date:
December 31, 1986
Creator:
Abrevaya, H.
Object Type:
Report
System:
The UNT Digital Library
Micelle-derived catalysts for extended Schulz-Flory. [Quarterly report], January 1, 1986--March 31, 1986
The objective of this program is to develop a synthesis gas conversion catalyst selective to gasoline or diesel range fuel via application of a micelle technique for preparing specific site supported ruthenium particles. The current emphasis is to investigate hydrocarbon cutoff principle and to apply it for developing selective catalysts. During this quarter, micelle technique was further improved and 1 ruthenium particle:l reverse micelle limit was approached by careful control of catalyst synthesis conditions. Accordingly, it became possible to synthesize supported particles that closely meet the size and composition targets originally set. This improved technique was applied to synthesis of chemically modified ruthenium catalysts. Some of the chemically modified ruthenium catalysts will be evaluated later in the program. We previously reported that 40--60 {Angstrom} ruthenium particles prepared on {gamma}-alumina do not result in hydrocarbon cutoff. We could not determine then whether smaller ruthenium particles result in hydrocarbon cutoff because these particles agglomerated via ruthenium carbonyl formation during the course of a 6--10 day test. We have recently evaluated a catalyst with 20--40 {Angstrom} ruthenium particles prepared on {gamma}-alumina by carefully analyzing products initially made during the test prior to substantial ruthenium agglomeration. We concluded that cutoff is not effected by …
Date:
December 31, 1986
Creator:
Abrevaya, H.
Object Type:
Report
System:
The UNT Digital Library
Micelle-derived catalysts for extended Schulz-Flory. Technical progress report, July 1, 1986--September 30, 1986
The objective of this program is to develop a synthesis gas conversion catalyst with higher selectivity to liquid fuels, while maintaining catalytic activity and stability at least equivalent relative to state-of-the-art precipitated iron catalysts. During this quarter, the emphasis in the program has been the investigation of the hydrocarbon cutoff hypothesis with supported ruthenium catalysts. An alumina-supported catalyst with smaller than 20{Angstrom} ruthenium particles was tested under conditions of maximal water gas shift activity. During this test more than 90% of the water made in the Fischer-Tropsch synthesis reaction was converted to H{sub 2}. However, the extent of ruthenium metal agglomeration was not reduced. Accordingly, it was not possible to conclude whether hydrocarbon cutoff occurs with smaller than 20{Angstrom} ruthenium particles on {gamma}-alumina. A ruthenium catalyst prepared on Y-type zeolite had 20{Angstrom} or smaller ruthenium particles according to STEM examination and a 15{Angstrom} average ruthenium metal particle size according to EXAFS examination. The ruthenium metal particle size was stable during the test with this catalyst. The hydrocarbon product distribution was Anderson-Schulz-Flory with no cutoff up to a carbon number of 160. A well-dispersed titania-supported ruthenium catalyst is going to be evaluated during the next quarter in order to determine whether …
Date:
December 31, 1986
Creator:
Abrevaya, H.
Object Type:
Report
System:
The UNT Digital Library
Micelle-derived catalysts for extended Schulz-Flory. Technical progress report, October 1, 1986--December 31, 1986
The objective of this program is to develop a synthesis gas conversion catalyst with higher selectivity to liquid fuels, while maintaining catalytic activity and stability at least equivalent relative to state-of-the-art precipitated iron catalysts. Hydrocarbon cutoff hypothesis and developmental needs for a ruthenium catalyst with low light ends selectivity were investigated during this quarter. Hydrocarbon product distribution was Anderson-Schulz-Flory up to a carbon number of 250 and cutoff did not occur with a titania-supported catalyst containing ruthenium particles smaller than 20{Angstrom}. It was found that an alumina-supported catalyst with 1% (by weight) ruthenium in the form of 50{Angstrom} to 100{Angstrom} metal particles was initially about half as active (by catalyst volume) and made one quarter of the amount of C{sub 1}{minus}C{sub 4} light end products relative to the Sasol precipitated iron catalyst.
Date:
December 31, 1986
Creator:
Abrevaya, H.
Object Type:
Report
System:
The UNT Digital Library
The Paducah Post (Paducah, Tex.), Vol. 80, No. 23, Ed. 1 Thursday, July 31, 1986
Weekly newspaper from Paducah, Texas that includes local, state, and national news along with advertising.
Date:
July 31, 1986
Creator:
Adams, Patty
Object Type:
Newspaper
System:
The Portal to Texas History
Status of Switched-Power Linac studies at BNL (Brookhaven National Laboratory) and CERN (European Organization for Nuclear Research)
The switched-power linac (SPL) concepts are reviewed briefly, and recent work on computer-modelling of the photoemission process at the photocathode and the experimental study of the process are discussed. Work on rf-modelling of the properties of the radial transmission line is outlined. (LEW)
Date:
October 31, 1986
Creator:
Aronson, S.
Object Type:
Article
System:
The UNT Digital Library
El Campo Leader-News (El Campo, Tex.), Vol. 101, No. 82, Ed. 1 Wednesday, December 31, 1986
Semi-weekly newspaper from El Campo, Texas that includes local, state, and national news along with advertising.
Date:
December 31, 1986
Creator:
Barbee, Chris
Object Type:
Newspaper
System:
The Portal to Texas History
Rains County Leader (Emory, Tex.), Vol. 99, No. 9, Ed. 1 Thursday, July 31, 1986
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
July 31, 1986
Creator:
Becknell, Kathleen Hill
Object Type:
Newspaper
System:
The Portal to Texas History
Research on the Seasonal Snow of the Arctic Slope. Annual Progress Report, July 15, 1984--January 15, 1986
This project deals with the seasonal snow on Alaska`s Arctic Slope. It is concentrated on snow of the R{sub 4}D project area. However, an important aspect of this study is to relate the snow cover of this area with the rest of the Arctic Slope. The goals include determination of the amount of precipitation which comes as snow, the wind transport of this snow and its depositional pattern as influenced by drifting, the physical properties of the snow, the physical processes which operate in it, the proportions of it which go into evaporation, infiltration and runoff, and the biological role of the snow cover.
Date:
December 31, 1986
Creator:
Benson, C. S.
Object Type:
Report
System:
The UNT Digital Library
The Cuero Record (Cuero, Tex.), Vol. 90, No. 105, Ed. 1 Wednesday, December 31, 1986
Semi-weekly newspaper from Cuero, Texas that includes local, state, and national news along with advertising.
Date:
December 31, 1986
Creator:
Berner, Homer H.
Object Type:
Newspaper
System:
The Portal to Texas History
Methods for environmental monitoring of DOE waste disposal and storage sites. Semiannual progress report, November 1, 1985--March 31, 1986
This progress report contains an account of recent research efforts carried out at the Oak Ridge Research Institute, to raise antibodies in New Zealand White Rabbits which are specific for various strains of Thiobacillus ferrooxidans bacteria. It is then intended to use the antibodies, in a subsequent phase of the project, to develop one or more ELISAs, which would be used to analyze, both in the laboratory and in the field, the numbers and extent of dispersion of these microorganisms at acid mine drainage sites. This is important because it is the metabolic consequences of unrestricted dissemination of these bacteria which are responsible in large measure for the environmentally damaging acid run-off. Efforts to control the proliferation of these microorganisms have been relatively unfocused up to the present, because of the lack of suitably discriminating methods of assaying the effects of treatment. In this report, the authors describe the work carried out in the first section of the project, which has been concerned with the raising of the antibodies to the Thiobacillus ferrooxidans cultures. They given an account of how the various cultures were grown, how they were treated before being injected into rabbits, the injection protocol, how the animals …
Date:
December 31, 1986
Creator:
Blake, R. & Revis, N.
Object Type:
Report
System:
The UNT Digital Library
The Colony Courier (The Colony, Tex.), Vol. 10, No. 49, Ed. 1 Thursday, July 31, 1986
Weekly newspaper from The Colony, Texas that includes local news along with advertising.
Date:
July 31, 1986
Creator:
Blalock, Jack
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 93, No. 12, Ed. 1 Thursday, July 31, 1986
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
July 31, 1986
Creator:
Bridges, G. Frank
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 78, Ed. 1 Friday, January 31, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
January 31, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 128, Ed. 1 Monday, March 31, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 31, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 233, Ed. 1 Thursday, July 31, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
July 31, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 259, Ed. 1 Sunday, August 31, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 31, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 312, Ed. 1 Friday, October 31, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
October 31, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 65, No. 51, Ed. 1 Wednesday, December 31, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 31, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Zeolitic alteration and fracture fillings in silicic tuffs at a potential nuclear waste repository, Yucca Mountain, Nevada, USA
This paper describes the distribution and chemistry of zeolites in tuffs and in fractures at Yucca Mountain. Samples used in this study were collected from continuously-cored exploratory drill holes. A variety of analytical techniques, including optical petrography, x-ray powder diffraction, electron microanalysis, and x-ray fluorescence, were used to characterize the distribution and chemistry of zeolites in these samples.
Date:
December 31, 1986
Creator:
Broxton, David E. & Carlos, Barbara Arney
Object Type:
Article
System:
The UNT Digital Library
The Llano News (Llano, Tex.), Vol. 95, No. 40, Ed. 1 Thursday, July 31, 1986
Weekly newspaper from Llano, Texas that includes local, state, and national news along with advertising.
Date:
July 31, 1986
Creator:
Buckner, Walter L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 72, No. 208, Ed. 1 Thursday, July 31, 1986
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
July 31, 1986
Creator:
Byerly, Steve
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Kriging for interpolation of sparse and irregularly distributed geologic data
For many geologic problems, subsurface observations are available only from a small number of irregularly distributed locations, for example from a handful of drill holes in the region of interest. These observations will be interpolated one way or another, for example by hand-drawn stratigraphic cross-sections, by trend-fitting techniques, or by simple averaging which ignores spatial correlation. In this paper we consider an interpolation technique for such situations which provides, in addition to point estimates, the error estimates which are lacking from other ad hoc methods. The proposed estimator is like a kriging estimator in form, but because direct estimation of the spatial covariance function is not possible the parameters of the estimator are selected by cross-validation. Its use in estimating subsurface stratigraphy at a candidate site for geologic waste repository provides an example.
Date:
December 31, 1986
Creator:
Campbell, K.
Object Type:
Article
System:
The UNT Digital Library