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The development of mechanical strength in a ceramic material during firing

Description: This experiment was designed for high school students who have a very limited background in ceramic materials, but the experiments could also be used at the college level. The objective of the experiment is to teach students about the development of mechanical strength in a ceramic material as a result of the firing process and about testing methods used for brittle materials. In the experiment, clay-based ceramic bars of uniform circular cross section are prepared by extrusion. The bars are th… more
Date: November 1, 1994
Creator: Bunnell, L. R. & Piippo, S. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Characterization of thorium and uranium contaminated soil from a nuclear fuel facility

Description: This paper describes the utility of soil characterization using electron microscopy to support decontamination efforts of contaminated soil. Soil contaminated with thorium and uranium from the grounds of a nuclear fuel manufacturing facility was subjected to remediation efforts. A light acid leach was able to remove only 30% of the thorium suggesting that the thorium was present in two or more forms. Analytical electron microscopy determined that all of the thorium was present as ThO{sub 2}, bu… more
Date: February 1, 1994
Creator: Brown, N. R.; Buck, E. C.; Dietz, N. L.; Bates, J. K. & Carlson, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design of UMTRA covers to mitigate the effect of frost penetration

Description: The Uranium Mill Tailings Remedial Action (UMTRA) Project, contracted by the US Department of Energy (DOE), requires construction of disposal cells for residual radioactive materials from abandoned uranium mill tailings. A disposal cell consists of contaminated material placed within a stabilized embankment with a top cover. The embankment and cover should be effective for up to 1000 years, to the extent reasonably achievable, and in any case for at least 200 years. The embankment cover usually… more
Date: March 1, 1994
Creator: Banani, A. M. & Claire, R. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The crystallization of new synthetic organo-clays

Description: A novel method for the preparation of new synthetic, potentially catalytic clays has been discovered. In this method, a diverse variety of organic and-organometallic molecules can be directly incorporated during crystallization of the clay. This method has great potential for the incorporation of catalytically active species to create new heterogeneous catalysts. The catalyst precursors are organic-inorganic composites comprised of a layered silicate intercalated with such molecules as porphyri… more
Date: March 1, 1994
Creator: Carrado, K. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Colloid formation during the corrosion of SRL 200 glass

Description: Nonradioactive SRL 200S glass and fully radioactive SRL 200R glass were reacted at glass surface areas to leachant volume (SA/V) ratios of 20,000, 2,000, and 340 m{sup {minus}1} for times varying from several days to a few years. The particles present in the leachates of these tests have been examined by analytical electron microscopy (AEM). The major colloidal clay phase was identified as a smectite clay from its characteristic electron diffraction pattern. The clay colloids eventually disappe… more
Date: May 1, 1994
Creator: Buck, E. C.; Bates, J. K. & Feng, X.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Organic/Inorganic interactions of nitrogen in oil fields Geochemistry. Part 1, Geochemistry: Final report, September 15, 1991--March 15, 1994

Description: This research examines the nitrogen isotopic composition of fixed-NH{sub 4} in order to test the hypothesis that NH{sub 4}{sup +} is released from organic matter during hydrocarbon generation and can be incorporated in diagenetic clay minerals along migration conduits. Anomalously high levels of NH{sub 4}-substitution recognized in hydrocarbon bearing sandstones may indicate paths of hydrocarbon migration long after the hydrocarbons have moved on toward a trap. This is important because most of… more
Date: March 1994
Creator: Willimas, L. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Wetland Treatment of Oil and Gas Well Wastewaters. Quarterly Technical Report, November 25, 1993--March 24, 1994

Description: In the third quarterly report, adsorption of heavy metals ions such as Cu(II) and Cr(VI) onto soils drawn from the laboratory-type wetland (LW) was shown to be weak. On the other hand, it was shown that modified-clays did adsorb Cr(VI) ions strongly at pH 4.5. Further, studies on the pH dependence of the adsorption of {beta}-naphthoic acid, (NA), a well-documented contaminant in many oil and gas well waste waters (4), onto modified-clays were undertaken and it was shown that uptake of NA by mod… more
Date: April 15, 1994
Creator: Kadlec, R. H. & Srinivasan, K. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Measurement of alkali vapors in PFBC exhaust. Final report

Description: Under the auspices of the US Department of Energy through Morgantown Energy Technology Center, laboratory-scale studies were conducted to develop a regenerable activated-bauxite adsorbent (RABA) for use in an in situ regenerable activated-bauxite sorber alkali monitor (RABSAM). The RABSAM is a sampling probe that does not require a high-temperature/high-pressure sampling line for reliable measurement of alkali vapor in the exhaust of pressurized fluidized-bed combustor (PFBC). The RABA can be g… more
Date: January 1, 1994
Creator: Lee, S. H. D. & Swift, W. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Adsorption and diffusion of fluids in well-characterized adsorbent materials. [Annual] progress report, August 1, 1993--July 31, 1994

Description: During this period, work has included molecular simulations for simple gases in well-characterized materials (carbons, aluminophosphates, buckytubes, pillared clays, MCM-41 zeolite), water in carbons and aluminophosphates, and chain molecules in carbons.
Date: August 1, 1994
Creator: Gubbins, K. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of the selective hydrophobic coagulation process. Technical progress report for the ninth quarter, October 1--December 31, 1993

Description: A novel technique for selectively coagulating and separating coal from dispersed mineral matter has been developed at Virginia Tech. The process, known as Selective Hydrophobic Coagulation (SHC), has been studied under the sponsorship of the U.S. Department of Energy since 1986 (Contracts DE-AC22-86PC91221 & DE-AC22- 9OPC90174). The SHC process differs from oil agglomeration, shear flocculation, polymer flocculation, and electrolytic coagulation processes in that it does not require reagents or… more
Date: July 1, 1994
Creator: Yoon, R. H. & Luttrell, G. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of dynamic testing performed on structural clay tile infilled frames

Description: The behavior of two structural clay tile infilled frames subjected to dynamic loading is investigated. The testing was performed by USACERL using a biaxial shake table machine on which two framed infills were spaced nine feet apart and connected by steel trusses and an eight inch concrete roof slab. The infills were composed of structural clay tile block which were laid with the cores horizontal. The specimen was loaded in both the out-of-plane and in-plane directions using a site specific time… more
Date: December 18, 1994
Creator: Fowler, J. J.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Behavior of structural clay tile infilled frames

Description: Steel frames infilled with structural clay tile have been used in commercial and industrial buildings for most of this century. Often these buildings are located in moderate to high seismic zones and are likely to experience earthquake forces. Little prior research has been conducted to investigate the behavior of clay tile infills under lateral loading. Twenty-one large-scale clay tile infilled frames were tested to determine their behavior and correlate the results with other available experi… more
Date: December 18, 1994
Creator: Flanagan, R.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mechanisms of gas bubble retention

Description: Retention and episodic release of flammable gases are critical safety concerns regarding double-shell tanks (DSTs) containing waste slurries. Previous investigations have concluded that gas bubbles are retained by the slurry that has settled at the bottom of the DST. However, the mechanisms responsible for the retention of these bubbles are not well understood. In addition, the presence of retained gas bubbles is expected to affect the physical properties of the sludge, but essentially no liter… more
Date: September 1, 1994
Creator: Gauglitz, P. A.; Mahoney, L. A.; Mendoza, D. P. & Miller, M. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ferrocyanide safety program: Moisture migration test in ferrocyanide simulant

Description: During the initial phases of the Ferrocyanide Safety Program, it was presumed that actual sludge in tanks would behave as if it were a two-phase system in which a brine phase would seep through the insoluble solid phase of ferrocyanide and other precipitated salts. After flowsheet materials were produced and extensively tested, it became apparent that the ferrocyanide precipitates held extensive quantities of water (50% by weight or more) that were far above what would be expected from hydrated… more
Date: August 1, 1994
Creator: Crippen, M. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Vapor phase VOC transport in physically-mixed clay soils

Description: Experiments were conducted to provide insight into the controlling removal mechanisms for a mixed region vapor stripping process in clay soils. Results of soil column experiments were compared to a mathematical model to determine intra-aggregate diffusion coefficients and sorption coefficients at different temperatures. Under the assumption that intra-aggregate diffusion was the rate limiting removal mechanism, the mathematical model predicted the removal of trichloroethylene at 20{degrees}C, 4… more
Date: September 1, 1994
Creator: Carpenter, M. D.; Gierke, J. S.; Siegrist, R. L. & West, O. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Superior catalysts for selective catalytic reduction of nitric oxide. Quarterly technical progress report, 1 April--30 June 1994

Description: In the last Quarterly Technical Progress Report the authors reported the synthesis and (partial characterization) and SCR (Selective Catalytic Reduction of NO) activity for a delaminated Fe{sub 2}O{sub 3}-pillared clay (Fe{sub 2}O{sub 3}-PILC). The SCR activity for this PILC was substantially higher than that of the commercial-type V{sub 2}O{sub 5} + WO{sub 3}/TiO{sub 2} catalyst. During the past quarter, the authors first completed the characterization of the delaminated Fe{sub 2}O{sub 3}-PILC… more
Date: September 1, 1994
Creator: Chen, J. P.; Li, W. B.; Hausladen, M. C.; Kikkinides, E. S. & Yang, R. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Alternative barrier layers for surface covers in dry climates

Description: Surface covers are one of the most widespread remediation and waste management options in all climates. Barrier layers to limit percolation through cover systems are principal features of engineered, multi-component cover designs. Conventional barrier layer components developed for humid climates have limitations in dry climates. One alternative barrier layer is a capillary barrier, which consists of a fine-over-coarse soil arrangement. The capacity of capillary barrier to laterally divert down… more
Date: September 1, 1994
Creator: Stormont, J. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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{sup 31}P NMR study of the complexation of TBP with lanthanides and actinides in solution and in a clay matrix

Description: Goal was to use NMR to study TBP/lanthanide complexes in the interlayer or on edge sites of clays. Work in this laboratory yielded details of the complexation of Eu(NO{sub 3}){sub 3} and Pr(NO{sub 3}){sub 3} with TBP in hexane solution; this information is crucial to interpretation of results of NMR studies of the complexes exchanged into clays. The solution {sup 31}P-chemical shift values were improved by repeating the studies on the lanthanide salts dissolved directly into neat TBP. NMR studi… more
Date: July 24, 1994
Creator: Hartzell, C. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Characterization of the geology and contaminant distribution at the six phase heating demonstration site at the Savannah River Site

Description: The objective of the Volatile Organic Compounds in Non-arid Soils Integrated Demonstration at the Savannah River Site is to evaluate innovative remediation, characterization, and monitoring systems to facilitate restoration of contaminated sites. The focus of the third phase of the Integrated Demonstration is to evaluate the use of heating technologies, both radio frequency and ohmic heating, to enhance the removal of contamination from clay layers. This report documents characterization data c… more
Date: June 30, 1994
Creator: Eddy-Dilek, C. A.; Jarosch, T. R.; Keenan, M. A.; Parker, W. H.; Poppy, S. P. & Simmons, J. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Moving-bed, granular-bed filter development program option III: Development of moving-bed filter technology for multi-contaminant control task 14: Test plan. Topical report

Description: Hot gas cleanup of fuel gas resulting from coal gasification and combustion streams is described. Testing of various clay and sodium compound sorbents was performed and reviewed. Efforts are described for the control of halogens, sodium, cesium, lead, ammonia, potassium, and chlorine.
Date: November 1, 1994
Creator: Haas, J. C. & Wilson, K. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Geophysical data fusion for subsurface imaging

Description: Effective site characterization requires that many relevant geologic, hydrogeologic and biological properties of the subsurface be evaluated. A parameter that often directly influences chemical processes, ground water flow, contaminant transport, and biological activities is the lateral and vertical distribution of clays. The objective of the research an development under this contract is to improve non-invasive methods for detecting clay lenses. The percentage of clays in soils influences most… more
Date: December 31, 1994
Creator: Blohm, M.; Hatch, W.E.; Hoekstra, P. & Porter, D.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Contact micromechanics in granular media with clay

Description: Many granular materials, including sedimentary rocks and soils, contain clay particles in the pores, grain contacts, or matrix. The amount and location of the clays and fluids can influence the mechanical and hydraulic properties of the granular material. This research investigated the mechanical effects of clay at grain-to-grain contacts in the presence of different fluids. Laboratory seismic wave propagation tests were conducted at ultrasonic frequencies using spherical glass beads coated wit… more
Date: August 1, 1994
Creator: Ita, S. L.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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