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Direct conversion of methane to C sub 2 's and liquid fuels

Description: Research on promoted metal oxide catalysts has continued with the study of alkaline earth/metal oxide halide catalysts. A barium bromide/alumina catalyst was comparable in methane conversion and selectivity to C{sub 2}'s to barium chloride/alumina catalysts. The effects of varying methane to oxygen feed ratios were explored for one of the best alkaline earth catalysts and one of the best literature catalysts (Li/MgO). A significant decrease in the selectivity to C{sub 2}'s is observed upon addi… more
Date: February 14, 1990
Creator: Warren, B. K.; Campbell, K. D. & Matherne, J. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurements of optical loss in transparent solids using a novel spectrometer based on optical cavity decay

Description: Recent advances in High Average Power (HAP) solid state lasers and the development of new concept lasers with the potential of ultra- high average power output have put increasing demands on the transparency of optical window materials. To gain a better understanding of the current status of window materials and to direct research toward more nearly transparent materials, we have constructed an optical characterization facility with the purpose of making quantitative optical loss measurements i… more
Date: December 14, 1988
Creator: Milanovich, F. P.; Hunt, J. T. & Roe, J. N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Highly 15N-Enriched Chondritic Clasts in the Isheyevo Meteorite

Description: The metal-rich carbonaceous chondrites (CB and CH) have the highest whole-rock {sup 15}N enrichment ({delta}{sup 15}N up to +1500{per_thousand}), similar to {delta}{sup 15}N values reported in micron-sized regions (hotspots) of Interplanetary Dust Particles (IDPs) of possibly cometary origin and fine-grained matrices of unmetamorphosed chondrites. These {sup 15}N-rich hotspots are commonly attributed to low-temperature ion-molecule reactions in the protosolar molecular cloud or in the outer par… more
Date: January 14, 2009
Creator: Bonal, L; Huss, G R; Krot, A N; Nagashima, K; Ishii, H A; Bradley, J P et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

HFC Concrete: A Low-Energy, Carbon-Dioxide-­Negative Solution for reducing Industrial Greenhouse Gas Emissions

Description: Solidia/CCSM received funding for further research and development of its Low Temperature Solidification Process (LTS), which is used to create hydrate-free concrete (HFC). LTS/HFC is a technology/materials platform that offers wide applicability in the built infrastructure. Most importantly, it provides a means of making concrete without Portland cement. Cement and concrete production is a major consumer of energy and source of industrial greenhouse gas (GHG) emissions. The primary goal of thi… more
Date: May 14, 2012
Creator: McCandlish, Larry & Riman, Richard
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Neptunium Solubility in the Near-Field Environment of A Proposed Yucca Mountain Repository

Description: For representing the source-term of a proposed repository at Yucca Mountain, NV, total system performance assessment models evaluate the disequilibrium degradation of the waste forms to capture a bounding rate for radionuclide source-term availability and use solubility constraints that are more representative of longer-term, equilibrium processes to limit radionuclide mass transport from the source-term. These solubility limits capture precipitation processes occurring either as the waste form… more
Date: May 14, 2004
Creator: Sassani, D.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Energy related studies utilizing microcline thermochronology

Description: Using Microcline Thermochronology (MTC), we have investigated the hydrothermal maturity of the Salton Sea Geothermal Field, potential or hydrocarbon maturation associated with heating due to ridge subduction beneath accretionary prism sediments, developed a single crystal dating system which has proven to greatly enhance interpretations regarding MTC, and also have begun to develop sound theoretical and experimental techniques which truly revolutionize our understanding of argon systematics in … more
Date: November 14, 1989
Creator: Harrison, T.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

THE ABSOLUTE ABUNDANCE OF THE CHROMIUM ISOTOPES IN SOME SECONDARY MINERALS

Description: Isotopic assays have been made on the Cr in samples from 14 different chrominiferous minerals from different geographic and meteoritic sources. The results of the assays indicate that it is not possible to state unequivocally that variations in isotopic composition have been observed. (auth)
Date: March 14, 1962
Creator: Svec, H. J.; Flesch, G. D. & Capellen, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

EQ3/6, a software package for geochemical modeling of aqueous systems: Package overview and installation guide (Version 7.0)

Description: EQ3/6 is a software package for geochemical modeling of aqueous systems. This report describes version 7.0. The major components of the package include: EQ3NR, a speciation-solubility code; EQ6, a reaction path code which models water/rock interaction or fluid mixing in either a pure reaction progress mode or a time mode; EQPT, a data file preprocessor, EQLIB, a supporting software library; and five supporting thermodynamic data files. The software deals with the concepts of thermodynamic equil… more
Date: September 14, 1992
Creator: Wolery, T.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling of Cation Binding in Hydrated 2:1 Clay Minerals - Final Report

Description: Hydrated 2:1 clay minerals are high surface area, layered silicates that play a unique role in determining the fate of radionuclides in the environment. This project consisted of developing and implementing computer simulation methods for molecular characterization of the swelling and ion exchange properties of Hydrated 2:1 clay minerals, and the subsequent analysis and theoretical modeling with a view toward improving contaminant transport modeling as well as soil remediation and radionuclide … more
Date: September 14, 2000
Creator: Smith, David E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pyrite surface characterization and control for advanced fine coal desulfurization technologies

Description: The objective of this project is to conduct extensive studies on the surface reactivity and surface hydrophobicity of coal-pyrites using various surface characterization techniques and to correlate the alteration of the coal-pyrite surface with the efficiency of pyrite rejection in coal flotation. The flotation characteristics of coal-pyrites under various conditions was studied and compared with ore-pyrite and coal to determine the causes of pyrite rejection difficulties in coal flotation. Bot… more
Date: July 14, 1992
Creator: Wang, Xiang-Huai; Leonard, J. W.; Parekh, B. K.; Jiang, Chengliang & Raichur, A. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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