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A Theoretical Study of the Transient Operation and Stability of Two-Phase Natural Circulation Loops

Description: Mathematical models of the time-dependent behavior of two-phase natural- circulation loops were used to predict the operation and to explain the unusual instability sometimes observed. The initial results obtained for a loop similar to the Univ. of Minnesota loop were used to formulate a more complex and accurate model, and the predicted transient behavior was in close agreement with the experimental results from the Minnesota loop. For a 300psia, high-pressure loop, unstable oscillatory behavi… more
Date: June 1, 1961
Creator: Garlid, K.; Amundson, N. R. & Isbin, H. S.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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HC quench layer formation in combustion processes. Technical progress report, January-April 1980

Description: The project is aimed at understanding wall quenching and other processes responsible for surface generated hydrocarbons in combustion under engine-like conditions. The study concerns the effects of turbulence on the evolution of hydrocarbons. At the conclusion of the program, significant new experimental information will have been generated and an analytical model of the fluid mechanics and some aspects of the chemistry of quenching will be formulated. The work is divided into three tasks: (1) … more
Date: June 1, 1980
Creator: Lavoie, G. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Biological production of organic solvents from cellulosic wastes. Progress report, September 15, 1976--September 14, 1977

Description: The objectives of this project are to optimize a modular process to convert cellulosic wastes to butanol and other oil-sparing chemicals. Research to date has focused on developing analytical methods, establishing a good data base and improving cellulase yields. Reliable assay methods for the Thermoactinomyces cellulase complex have been developed, measuring glucose and reducing sugar from filter paper and Avicel for total cellulase activity, viscosity change with carboxymethyl cellulose for th… more
Date: June 1, 1977
Creator: Pye, E.K.; Humphrey, A.E. & Forro, J.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Compound nucleus studies withy reverse kinematics

Description: Reverse kinematics reactions are used to demonstrate the compound nucleus origin of intermediate mass particles at low energies and the extension of the same mechanism at higher energies. No evidence has appeared in our energy range for liquid-vapor equilibrium or cold fragmentation mechanisms. 11 refs., 12 figs.
Date: June 1, 1985
Creator: Moretto, Luciano G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Feasibility Studies of in-Situ Coal Gasification in the Warrior Coal Field. Quarterly Report

Description: Because of high internal temperatures, the external temperature has no effect upon the reaction rate of coke particles with air for temperatures above 750/sup 0/K. Reactions could not be initiated below that temperature. Chemical reaction rate was not found to be a rate-controlling step: both extra-particle and intra-particle diffusion are important and limit the rate of oxidation. The observed values of k/sub c/, the extra-particle mass transfer coefficient were found to be in good agreement w… more
Date: June 1, 1979
Creator: Douglas, George W. & McKinley, Marvin D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Search for collective phenomena in relativistic nuclear collisions

Description: After some general introductory material, the weakness of the fireball/fire streak model is illustrated, and it is indicated that more complex models are both necessary and available. The single-particle spectra of nucleons, clusters, and pions are discussed, and then attention is focused on the fate of the target nucleus and possible evidence of collective phenomena. Finally, data on central collisions that reflect the nature of the energy flux in the target nucleus are discussed. 26 figures. … more
Date: June 1, 1980
Creator: Gutbrod, H.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Characteristics of American coals in relation to their conversion into clean-energy fuels. Final report. [1150 samples of US coals]

Description: To further characterize the Nation's coals, the Penn State Coal Sample Bank and Data Base were expanded to include a total of 1150 coal samples. The Sample Bank includes full-seam channel samples as well as samples of lithotypes, seam benches, and sub-seam sections. To the extent feasible and appropriate basic compositional data were generated for each sample and validated and computerized. These data include: proximate analysis, ultimate analysis, sulfur forms analysis, calorific value, macera… more
Date: June 1, 1982
Creator: Spackman, W.; Davis, A.; Walker, P. L.; Lovell, H. L.; Vastola, F. J.; Given, P. H. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fundamental studies of catalytic gasification

Description: The major purpose of this project was to finding catalysts which will permit steam gasification of carbonaceous material at reasonable rates and at lower temperatures than currently practiced. This quarter, experiments with steam gasification of graphite were performed. Catalysts studied were potassium, calcium, and nickel oxides. Reaction kinetics are discussed. 28 refs., 34 figs., 8 tabs.
Date: June 1, 1991
Creator: Heinemann, H. & Somorjai, G.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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General Chemistry Division quarterly report, January--March 1977

Description: Reported are: development of analytical capabilities of a submillimeter spectrometer; improved minimum detectibility of laser-induced molecular fluorescence; use of laser photoionization sources for analytical mass spectrometry; photoacoustic spectroscopy of solids; development of time-resolved spectroscopy for multicomponent mixtures; excited-state reactions of Ba/sup +/ + N/sub 2/O ..-->.. BaO +N/sub 2/; development of an ion-cyclotron-resonance spectrometer; development of glow-discharge mul… more
Date: June 24, 1977
Creator: Harrar, J.E. (ed.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Homogeneous Production and Removal of NO/sub X/ From Combustion Exhaust Gases. Seventh Quarterly Technical Summary Report, 1 March-31 May 1980

Description: The rate constants for the reaction OH + NH/sub 3/ ..-->.. NH/sub 2/ + H/sub 2/O have been measured over the temperature range 294 - 1075 K. The data can be fit by the Arrhenius expression k(cm/sup 3/ molecule/sup -1/ s/sup -1/) = 5.41 +- 0.86 x 10/sup -12/ exp(-2120 +- 143 kcal mol/sup -1//RT). A chemical model of the NO/sub x/ chemistry has been developed which includes 54 reactions. Although not yet complete, the reaction set clearly indicates the key reaction is NH/sub 2/ + NO. The determin… more
Date: June 1, 1980
Creator: Silver, J. A.; Gozewski, C. M. & Kolb, C. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Oil shale oxidation at subretorting temperatures

Description: Green River oil shale was air oxidized at subretorting temperatures. Off gases consisting of nitrogen, oxygen, carbon monoxide, carbon dioxide, and water were monitored and quantitatively determined. A mathematical model of the oxidation reactions based on a shrinking core model has been developed. This model incorporates the chemical reaction of oxygen and the organic material in the oil shale as well as the diffusivity of the oxygen into the shale particle. Diffusivity appears to be rate limi… more
Date: June 1, 1980
Creator: Jacobson, I.A. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Membrane-membrane interactions in a lipid-containing bacteriophage system. Progress report, October 1, 1978-September 30, 1979. [Hydrophobic membrane perturbers as antiviral agents]

Description: Progress is reported on research on two aspects of the life cycle of PM2, a lipid-containing bacteriophage. The first concerns the initial interaction of PM2 with the outer membrane of its host cell, Pseudomonas BAL-31. The second concerns the assembly of PM2 in infected cells and the structural features of hydrophobic membrane perturbers that inhibit PM2 assembly. Several other projects have been completed: distribution of PM2 receptors; effects of adamantance derivatives on PM2 production; hy… more
Date: June 1, 1979
Creator: Snipes, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Nuclear Science Division annual report, July 1, 1981-September 30, 1982

Description: This report summarizes the scientific research carried out within the Nuclear Science Division between July 1, 1981, and September 30, 1982. Heavy-ion investigations continue to dominate the experimental and theoretical research efforts. Complementary programs in light-ion nuclear science, in nuclear data evaluation, and in the development of advanced instrumentation are also carried out. Results from Bevalac experiments employing a wide variety of heavy ion beams, along with new or upgraded de… more
Date: June 1, 1983
Creator: Mahoney, J. (ed.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Long-term Variations of CO2 Trapped in Different Mechanisms in Deep Saline Formations: A Case Study of the Songliao Basin, China

Description: The geological storage of CO{sub 2} in deep saline formations is increasing seen as a viable strategy to reduce the release of greenhouse gases to the atmosphere. There are numerous sedimentary basins in China, in which a number of suitable CO{sub 2} geologic reservoirs are potentially available. To identify the multi-phase processes, geochemical changes and mineral alteration, and CO{sub 2} trapping mechanisms after CO{sub 2} injection, reactive geochemical transport simulations using a simple… more
Date: June 10, 2008
Creator: Zhang, Wei; Li, Yilian; Xu, Tianfu; Cheng, Huilin; Zheng, Yan & Xiong, Peng
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Isopiestic Investigation of the Osmotic and Activity Coefficients of {yMgCl2 + (1 - y)MgSO4}(aq) and the Osmotic Coefficients of Na2SO4.MgSO4(aq) at 298.15 K

Description: Isopiestic vapor pressure measurements were made for {l_brace}yMgCl{sub 2} + (1-y)MgSO{sub 4}{r_brace}(aq) solutions with MgCl{sub 2} ionic strength fractions of y = 0, 0.1997, 0.3989, 0.5992, 0.8008, and (1) at the temperature 298.15 K, using KCl(aq) as the reference standard. These measurements for the mixtures cover the ionic strength range I = 0.9794 to 9.4318 mol {center_dot} kg{sup -1}. In addition, isopiestic measurements were made with NaCl(aq) as reference standard for mixtures of {l_b… more
Date: June 6, 2007
Creator: Miladinovic, J; Ninkovic, R; Todorovic, M & Rard, J A
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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CHEMISTRY OF +1 IODINE IN ALKALINE SOLUTION

Description: The iodine species formed either by adding hypochlorite to a basic iodide solution or by adding triiodide to sodium hydroxide, was identified as hypoiodite ion. The absorption spectrum of IO{sup -} was investigated in the wavelength range from 450 m{micro} to 280 m{micro}. The kinetics of the reaction I{sup -} + ClO{sup -} = IO{sup -} + Cl{sup -} was studied spectrophotometrically in alkaline solution. The forward rate law was found to be d(IO{sup -})/dt = k(I{sup -})(ClO{sup -})/OH{sup -}. At … more
Date: June 2, 1958
Creator: Chia, Yuan-tsan.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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ORBITAL SYMMETRY CONTROL IN THE NITRONE-OXAZIRIDINE SYSTEM.NITRONE PHOTOSTATIONARY STATES

Description: Recent the orbital symmetry rules have been shown to apply to hetero-atom systems such as nitrone thermal cycloaddition reactions and the thermal and photochemical aziridine ring cleavage at the C-C bond. The concerted photocyclization is disrotatory and the reverse thermal cleavage is conrotatory in these molecules with four {pi} electrons. In contrast to the azomethine ylide-aziridine system, the stereochemistry of the nitrone photocyclization to oxaziridine can only be observed on carbon and… more
Date: June 1, 1971
Creator: Splitter, Janet S.; Su, Tah-mun; Ono, Howard & Calvin, Melvin.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Path of Carbon in Photosynthesis III

Description: Although the overall reaction of photosynthesis can be specified with some degree of certainty (CO{sub 2} + H{sub 2}O + light {yields} sugars + possibly other reduced substances), the intermediates through which the carbon passes during the course of this reduction have, until now, been largely a matter of conjecture. The availability of isotopic carbon, that is, a method of labeling the carbon dioxide, provides the possibility of some very direct experiments designed to recognize these interme… more
Date: June 1, 1948
Creator: Benson, A. A. & Calvin, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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SOEC efficiency and cost improvement Part 1 and 2.

Description: Part I: Electrochemical and X-ray Characterization of Solid-Oxide Electrolysis Cell Oxygen Electrodes on Electrolyte Substrates--The governing reaction mechanisms, and the electrode and electrolyte material compositions and structures, that controls the efficiency and durability of the solid oxide electrolysis cells (SOEC) need to be identified and well-understood for a significant improvement in nuclear hydrogen production using high temperature steam electrolysis. ANL conducted experimental a… more
Date: June 20, 2007
Creator: Yildiz, B.; Chang, K.-C.; Meyers, D. J.; You, H.; Carter, J. D.; Elam, J. W. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mathematical modeling of the voloxidation process. Final report

Description: A mathematical model of the voloxidation process, a head-end reprocessing step for the removal of volatile fission products from spent nuclear fuel, has been developed. Three types of voloxidizer operation have been considered; co-current operation in which the gas and solid streams flow in the same direction, countercurrent operation in which the gas and solid streams flow in opposite directions, and semi-batch operation in which the gas stream passes through the reactor while the solids remai… more
Date: June 1, 1979
Creator: Stanford, T.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Degradation of the molecular weight and nitrate ester content of cellulose nitrate on thermal aging. [PBX-9404]

Description: Changes in molecular weight and nitrate ester content for cellulose nitrate (NC), either pure or as a constituent of PBX-9404, were determined as a function of time and temperature. Changes in the number-averaged molecular weight, M/sub n/, are described by the simple theory of random chain scission, and M/sub n/ is found to correlate well with nitrate ester loss. Significant differences are seen between NC aged in the isolated condition and aged as the binder in PBX-9404.
Date: June 1, 1981
Creator: Leider, H R
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of pH on the destruction of complexants with ozone in Hanford nuclear waste

Description: Chemical processing of nuclear waste at Hanford has generated some waste solutions with high concentration (0.1 to 0.5M) of N-(hydroxyethyl)-ethylenediaminetriacetic acid (HEDTA), ethylenediaminetetraacetic acid (EDTA), and other organic complexing agents. These complexants must be destroyed bacause they affect radionuclide migration in soils, waste concentration, radionuclide removal, and other waste storage and processing considerations. Previous studies on actual waste solutions demonstrated… more
Date: June 1, 1981
Creator: Winters, W.I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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