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Physicochemical basis of the Na-K-Ca geothermometer

Description: Regular changes in solution composition were observed experimentally during granite reaction with dilute NaCl (+CaCl/sub 2/) solutions; these changes closely follow the empirical Na-K-Ca geothermometer relationship. Initial minerals forming the granite (quartz, plagioclase, K-feldspar, and biotite) were etched by the reactions. Alteration phases formed include calcium-zeolite at <300/sup 0/C, feldspar overgrowths at >300/sup 0/C, and minor amounts of clay and calcsilicate at all temperatures. A… more
Date: August 1, 1986
Creator: Janecky, D. R.; Charles, R. W.; Bayhurst, Gregory K. & Benjamin, T. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Reaction Hamiltonian and state-to-state description of chemical reactions

Description: A chemical reaction is treated as a quantum transition from reactants to products. A specific reaction Hamiltonian (in second quantization formalism) is introduced. The approach leads to Franck-Condon-like factor, and adiabatic method in the framework of the nuclear motion problems. The influence of reagent vibrational state on the product energy distribution has been studied following the reaction Hamiltonian method. Two different cases (fixed available energy and fixed translational energy) a… more
Date: August 1, 1985
Creator: Ruf, B. A.; Kresin, V. Z. & Lester, W. A. Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Improved photoelectrodialytic cell

Description: A multicompartment photoelectrodialytic demineralization cell is provided with a buffer compartment interposed between the product compartment and a compartment containing an electrolyte solution. Semipermeable membranes separate the buffer compartment from the product and electrolyte compartments. The buffer compartment is flushed to prevent leakage of the electrolyte compartment from entering the product compartment.
Date: August 14, 1981
Creator: Murphy, G.W.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Evaluation of the photochemical production of hydrogen from solar energy

Description: The potential for utilizing solar energy through photochemical storage were investigated. Both water and nitrosyl chloride systems are examined. A comprehensive review of the literature led to the conclusion that many major questions must be answered before photochemical energy storage becomes a viable alternate means of exploiting solar energy.
Date: August 9, 1977
Creator: Heppert, J. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Chemistry and mineralogy of samples from the strategic petroleum reserve Bryan Mound site

Description: The goal of the Strategic Petroleum Reserve (SPR) program is to protect the United States from a temporary cutoff of imported crude oil by stockpiling a reserve of oil in caverns in Gulf Coast salt domes. Some suitable caverns already exist as a result of solution mining activities by commercial mining companies. Most of the caverns for the program, however, will be solution mined specifically for the SPR program. The tasks assigned to Sandia National Laboratories include conducting a geotechni… more
Date: August 1, 1980
Creator: Bild, R. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Leaching of actinides and technetium from simulated high-level waste glass

Description: Leach tests were conducted using a modified version of the IAEA procedure to study the behavior of glass waste-solution interactions. Release rates were determined for Tc, U, Np, Pu, Am, Cm, and Si in the following solutions: WIPP B salt brine, NaCl (287 g/l), NaCl (1.76 g/1), CaCl/sub 2/ (1.66 g/l), NaHCO/sub 3/ (2.52 g/l), and deionized water. The leach rates for all elements decreased an order of magnitude from their initial values during the first 20 to 30 days leaching time. The sodium bic… more
Date: August 1, 1979
Creator: Bradley, D.J.; Harvey, C.O. & Turcotte, R.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Meson production in relativistic-heavy-ion collisions

Description: The inclusive kappa/sup +/ production cross sections were measured at angles from 15 to 80/sup 0/ in collisions of protons (2.1 GeV) and deuterons (2.1 GeV/amu) on NaF and Pb, and Ne (2.1 GeV/amu) on C, NaF, KCl, Cu, and Pb. The kaons were identified by measuring the time of flight and the momentum in a magnetic spectrometer, and by detecting the particles from the kaon decays in a Pb glass Cerenkov counter. The momentum range of the detected kaons extended from 350 MeV/c to 750 MeV/c. The mult… more
Date: August 1, 1981
Creator: Schnetzer, S.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Modeling of porous electrodes in molten-salt systems

Description: Porous electrodes are used for many batteries because they permit the reactants to be close to the site of the electrochemical reaction. The basis for a nonuniform reaction distribution in such electrodes is reviewed, and some results are discussed for lithium alloy, iron sulfide cells. Discrepancies between model and experimental results can be attributed to poor approximations to the effective conductivity of packed-bed electrodes and to inadequate treatment of the precipitation of KCl.
Date: August 1, 1986
Creator: Newman, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Seventh quarterly report on Development of a model and computer code to describe solar grade silicon production processes, April 1-June 30, 1979

Description: This program aims at developing mathematical models and computer codes based on these models, which allow prediction of the product distribution in chemical reactors for converting gaseous silicon compounds to condensed-phase silicon. The major interest is in collecting silicon as a liquid on the reactor walls and other collection surfaces. Two reactor systems are of major interest, the Westinghouse SiCl/sub 4//Na reactor in which Si(l) is collected on the flow tube reactor walls and the new Ae… more
Date: August 1, 1979
Creator: Srivastava, R. & Gould, R. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hydrogen Sulphide Stress Corrosion Cracking in Materials for Geothermal Power. Final Report, Phase I

Description: Two point bent beam, NACE tensile, C-Ring and DCB stress intensity type specimens were employed to examine a series of steels' SSC resistance in the standard NACE solution and in several modifications pertinent to geothermal environments. Where direct comparisons were possible, the different types of tests qualitatively ranked the alloys in the same order. Of the commercially available steels examined suitable for downhole service, a fine-grained version of 4130 with additional Mo and some Cb a… more
Date: August 1, 1979
Creator: Troiano, A. R.; Hehemann, R. F. & Peterson, J. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Separation of Iron and Cobalt on Synthetic Resin

Description: In the separation of mixtures of radioactive iron and cobalt from neutron irradiated targets and in the removal of iron from cobalt targets for cyclotron production of radioiron, it is desirable to have a method superior to extraction from isopropyl ether in efficiency and ease of manipulation. Recent studies by Moore and Kraus on the separation of cobalt and nickel and on the behavior of iron in hydrochloric acid on Dowex-l resin in relation to the selective adsorption of chloride complexes of… more
Date: August 5, 1953
Creator: Helwig, H. L.; Ashikawa, J. K.; Clokie, H. & Smith, E. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of Organic Acid Additions on the General and Localized Corrosion Susceptibility of Alloy 22 in Chloride Solutions

Description: Electrochemical studies such as cyclic potentiodynamic polarization (CPP) and electrochemical impedance spectroscopy (EIS) were performed to determine the corrosion behavior of Alloy 22 (N06022) in 1M NaCl solutions at various pH values from acidic to neutral at 90 C. All the tested material was wrought Mill Annealed (MA). Tests were also performed in NaCl solutions containing weak organic acids such as oxalic, acetic, citric and picric. Results show that the corrosion rate of Alloy 22 was sign… more
Date: August 28, 2007
Creator: Carranza, R M; Giordano, C M; Rodr?guez, M A; Ilevbare, G O & Rebak, R B
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electrostatic Modeling of Vacuum Insulator Triple Junctions

Description: A comprehensive matrix of 60 tests was designed to explore the effect of calcium chloride vs. sodium chloride and the ratio R of nitrate concentration over chloride concentration on the repassivation potential of Alloy 22. Tests were conducted using the cyclic potentiodynamic polarization (CPP) technique at 75 C and at 90 C. Results show that at a ratio R of 0.18 and higher nitrate was able to inhibit the crevice corrosion in Alloy 22 induced by chloride. Current results fail to show in a consi… more
Date: August 13, 2007
Creator: Tully, L. K.; White, A. D.; Goerz, D. A.; Javedani, J. B. & Houck, T. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Use of Conducting Polymers for Electronic Communication with Redox Active Nanoparticles

Description: Nanoscale materials provide unique properties that will enable new technologies and enhance older ones. One area of intense activity in which nanoscale materials are being used is in the development of new functional materials for battery applications.1-4 This effort promises superior materials with properties that circumvent many of the problems associated with traditional battery materials. Previously we have worked on several approaches for using nanoscale materials for application as cathod… more
Date: August 8, 2004
Creator: Bazito, Fernanda; O'Brien, Robert & Buttry, Daniel A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Repassivation Potential of Alloy 22 in Sodium and Calcium Chloride Brines

Description: A comprehensive matrix of 60 tests was designed to explore the effect of calcium chloride vs. sodium chloride and the ratio R of nitrate concentration over chloride concentration on the repassivation potential of Alloy 22. Tests were conducted using the cyclic potentiodynamic polarization (CPP) technique at 75 C and at 90 C. Results show that at a ratio R of 0.18 and higher nitrate was able to inhibit the crevice corrosion in Alloy 22 induced by chloride. Current results fail to show in a consi… more
Date: August 11, 2007
Creator: Rebak, R B; Ilevbare, G O & Carranza, R M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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GEOCHEMICAL AND ISOTOPIC CONSTRAINTS ON GROUND-WATER FLOW DIRECTIONS, MIXING AND RECHARGE AT YUCCA MOUNTAIN, NEVADA

Description: This analysis is governed by the Office of Civilian Radioactive Waste Management (OCRWM) Analysis and Modeling Report Development Plan entitled ''Geochemical and Isotopic Constraints on Groundwater Flow Directions, Mixing and Recharge at Yucca Mountain'' (CRWMS M&amp;O 1999a). As stated in this Development Plan, the purpose of the work is to provide an analysis of groundwater recharge rates, flow directions and velocities, and mixing proportions of water from different source areas based on gro… more
Date: August 17, 2000
Creator: Meijer, A. & Kwicklis, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Actinide removal from aqueous solution with activated magnetite

Description: An actinide aqueous waste treatment process using activated magnetite has been developed at Rocky Flats. The use and effectiveness of various magnetites in lowering actinide concentrations in aqueous solution are described. Experiments indicate that magnetite particle size and pretreatment (activation of the magnetite surface with hydroxyl ions greatly influence the effective use of magnetite as an actinide adsorbent. With respect to actinide removal, Ba(OH)/sub 2/-activated magnetite was more … more
Date: August 10, 1987
Creator: Kochen, R.L. & Thomas, R.L. (ed.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Kinetic equations and type curves for predicting the precipitation of amorphous silica from geothermal brines

Description: The kinetics of amorphous silica precipitation from aqueous solution up to 100/sup 0/C and containing up to 1M NaCl were studied experimentally. Empirical equations for the rate of molecular deposition on surfaces as a function of temperature, dissolved silica concentration, pH and salinity are presented. Empirical type curves which depict the decrease in dissolved silica concentration through homogeneous nucleation of colloidal silica are also presented. Two practical examples related to geoth… more
Date: August 1, 1978
Creator: Weres, O.; Yee, A.W. & Tsao, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Evaluation of selected chemical processes for production of low-cost silicon (Phase III). Fifteenth quarterly progress report, April 1-June 30, 1979

Description: Progress has been made during this quarter on the assembly of the Process Development Unit (PDU) consisting of four of the critical components of the 50 MT/year Experimental Process System Development Unit (EPSDU) for the production of granular semiconductor-grade silicon by the zinc vapor reduction of silicon tetrachloride in a fluidized bed of seed particles. The target operation date of October 1, 1979, still appears attainable. An experimental wetted-wall condenser, about 1/10 the size of t… more
Date: August 15, 1979
Creator: Blocher, J.M. Jr. & Browning, M.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Physical properties of NH/sub 4/Cl 3NH/sub 3/

Description: The physical properties (viscosity, surface tension, and density) of NH/sub 4/Cl 3NH/sub 3/ were measured over the temperature range 14 to 26/sup 0/C and at the equilibrium NH/sub 3/ vapor pressure, approx. 5 atm, using a recently fabricated linear oscillation viscometer. Over this temperature range the viscosity varied from approx. 4 to approx. 6 cP and the density varied from 0.935 to 0.939 g/cm/sup 3/; the surface tension at 24/sup 0/C was 28 dyne/cm. The melting point of NH/sub 4/Cl 3NH/sub… more
Date: August 1, 1979
Creator: Nissen, D. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Aqueous solutions database to high temperatures and pressures: NaCl solutions

Description: A survey is made of available experimental data on sodium chloride solutions which are used in geothermal energy exploration and development for electrical power production and direct use. The data are classified as thermodynamic, transport and physical; they are useful in the design and development of a geothermal area from brine production through utilization, to brine disposal. An ideal data system for geothermal energy is described.
Date: August 1, 1979
Creator: Phillips, S.L.; Otto, R.J.; Ozbek, H. & Tavana, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Elastic and plastic strains and the stress corrosion cracking of austenitic stainless steels. Final report

Description: The influence of elastic (stress) and plastic (cold work) strains on the stress corrosion cracking of a transformable austenitic stainless steel was studied in several aqueous chloride environments. Initial polarization behavior was active for all deformation conditions as well as for the annealed state. Visual observation, potential-time, and current-time curves indicated the development of a pseudo-passive (flawed) film leading to localized corrosion, occluded cells and SCC. SCC did not initi… more
Date: August 1, 1979
Creator: Vaccaro, F. P.; Hehemann, R. F. & Troiano, A. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Environmental impact of coal ash on tributary streams and nearshore water or Lake Erie. Final report

Description: The environmental impact of coal ash disposal at a landfill site in north-central Chautauqua County, New York was studied from June 1975 through July 1977. Water samples taken from wells, ponds, and streams at 67 sites were analyzed for specific conductance, pH, alkalinity, arsenic, calcium, cadmium, chloride, chromium, copper, iron, magnesium, manganese, potassium, selenium, sodium, sulfate and zinc. Evidence suggests that ponds at the landfill were high in Ca, Fe, Mg, Mn, and SO/sub 4/ compar… more
Date: August 1, 1978
Creator: Wood, K.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Advanced systems for producing superclean coal

Description: The purpose of this project was to develop several advanced separation processes for producing superclean coal containing 0.4--2.0% ash and very little pyritic sulfur. Three physical and physico-chemical processes were studied: microbubble flotation, selective hydrophobic coagulation, and electrochemical coal cleaning. Information has been collected from bench-scale experiments in order to determine the basic mechanisms of all three processes. Additionally, because microbubble flotation has alr… more
Date: August 1, 1990
Creator: Yoon, R. H.; Luttrell, G. H. & Adel, G. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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