Sample records for iron magnesium manganese

  1. Drinking Water Problems: Iron and Manganese

    E-Print Network [OSTI]

    Dozier, Monty; McFarland, Mark L.

    2004-02-20T23:59:59.000Z

    . The chemical must be in the water for at least 20 minutes for oxi- dation to take place, longer if the water contains colloidal iron/manganese. After solid particles have formed they are filtered, often with a sand filter. Adding aluminum sulfate (alum...

  2. Iron and Manganese in Potable Water

    E-Print Network [OSTI]

    Young, Clifford Caudy

    1911-06-01T23:59:59.000Z

    none 22. Hays 469.0 1.0 none 23. Hays .55 24. Peabody 830.0 .5 trace 25. Caldwell 458.0 2.0 trace 26. Lyons 456.0 .1 trace 27. Osborne 377.0 .3 none 28. Herington 608,0 .1 trace 29. Sterling - - _ .1 .036 30. Waverly 546,0 .2 none 31. Clifton 350.... The occurence of a black peaty layer overlying white sand containing iron, the white sand in turn overlying red sand containing 10. oxidize^ iron, is a familiar sight to all engineers who have made excavations. Here the carbon dioxide produced...

  3. Influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese

    E-Print Network [OSTI]

    Noble, Abigail Emery

    2012-01-01T23:59:59.000Z

    Trace metal cycling is one of many processes that influence ocean ecosystem dynamics. Cobalt, iron, and manganese are redox active trace metal micro-nutrients with oceanic distributions that are influenced by both biological ...

  4. Electroless iron plating on pure magnesium for biomedical applications Xingkai Zhang a

    E-Print Network [OSTI]

    Zheng, Yufeng

    : Biomaterials Deposition Corrosion Thin films a b s t r a c t Electroless nickel plating is usually adopted geometries. Electroless nickel plating [10] is usually used to protect the magnesium alloy from corrosionElectroless iron plating on pure magnesium for biomedical applications Xingkai Zhang a , Wei Han a

  5. Magnesium and Manganese Silicides For Efficient And Low Cost Thermo-Electric Power Generation

    SciTech Connect (OSTI)

    Trivedi, Sudhir B. [Brimrose Technology Corporation; Kutcher, Susan W. [Brimrose Technology Corporation; Rosemeier, Cory A. [Brimrose Technology Corporation; Mayers, David [Brimrose Technology Corporation; Singh, Jogender [Pennsylvania State University

    2013-12-02T23:59:59.000Z

    Thermoelectric Power Generation (TEPG) is the most efficient and commercially deployable power generation technology for harvesting wasted heat from such things as automobile exhausts, industrial furnaces, and incinerators, and converting it into usable electrical power. We investigated the materials magnesium silicide (Mg2Si) and manganese silicide (MnSi) for TEG. MgSi2 and MnSi are environmentally friendly, have constituent elements that are abundant in the earth's crust, non-toxic, lighter and cheaper. In Phase I, we successfully produced Mg2Si and MnSi material with good TE properties. We developed a novel technique to synthesize Mg2Si with good crystalline quality, which is normally very difficult due to high Mg vapor pressure and its corrosive nature. We produced n-type Mg2Si and p-type MnSi nanocomposite pellets using FAST. Measurements of resistivity and voltage under a temperature gradient indicated a Seebeck coefficient of roughly 120 V/K on average per leg, which is quite respectable. Results indicated however, that issues related to bonding resulted in high resistivity contacts. Determining a bonding process and bonding material that can provide ohmic contact from room temperature to the operating temperature is an essential part of successful device fabrication. Work continues in the development of a process for reproducibly obtaining low resistance electrical contacts.

  6. Iron and manganese are two similar ele-ments that can be a nuisance in a drinking

    E-Print Network [OSTI]

    with miner- al deposits. This raises energy and water costs. Water contaminated with iron and manganese often contains iron or manganese bacteria. These bacteria feed on the minerals in the water. They do not cause elements in the earth's crust. As water percolates through soil and rock it can dissolve these minerals

  7. Synthesis gas conversion in a mixed slurry reactor with iron-manganese catalysts

    SciTech Connect (OSTI)

    Pennline, H.W.; Schehl, R.R.; Tischer, R.E.; Zarochak, M.F.

    1984-08-01T23:59:59.000Z

    Synthesis gas was reacted over different compositions of iron-manganese Fischer-Tropsch catalysts in a slurry reactor. The reactor operates in a back-mixed mode with a continuous flow of feed gas through the catalyst suspended in the liquid medium. Four catalysts with iron-manganese ratios of 57/43, 44/56, 22/78, and 10/90 were investigated at identical process conditions after a standard activation procedure. With time on stream for each catalyst system, hydrogenation of olefins occurred, along with olefin isomerization reactions. Activity, selectivity, and stability are discussed in general. Analyses of used catalyst samples are also reported.

  8. The effects of exercise and dietary fat on calcium, magnesium, iron, and zinc on selected tissues in rats 

    E-Print Network [OSTI]

    Nguyen, Thuy Huong

    1989-01-01T23:59:59.000Z

    of the requirements for the degree MASTER OF SCIENCE December 1989 Major Subject: Nutrition THE EFFECTS OF EXERCISE AND DIETARY FAT ON CALCIUM, MAGNESIUM, IRON, AND ZINC ON SELECTED TISSUES IN RATS A Thesis by THUY HUONG NGUYEN Approved as to style... and content by: Karen S. ubena (Chair of Committee) L. yne Greene (Member) Barbara C. O' Brien (Member) Gary C. Smith (Head of Department) December 1989 ABSTRACT The Effects of Exercise and Dietary Fat on Calcium, Magnesium, Iron, and Zinc...

  9. Reaction of Plutonium(VI) with the Manganese-Substituted Iron Oxide Mineral Goethite

    E-Print Network [OSTI]

    Hu, Yung-Jin Hu

    2011-01-01T23:59:59.000Z

    4.2 Goethite . . . . . . . . . . . . . . . .on Manganese-Substituted Goethite . . . . . . . . . 7.4.14.3 Manganese-Substituted Goethite . . 4.3.1

  10. Synthesis gas conversion in a mixed slurry reactor with iron-manganese catalysts. [Four catalysts with iron-manganese ratios of 57/43, 44/56, 22/78, and 10/90

    SciTech Connect (OSTI)

    Pennline, H.W.; Zarochak, M.F.; Tischer, R.E.; Schehl, R.R.

    1984-01-01T23:59:59.000Z

    Synthesis gas was reacted over different compositions of iron-manganese Fischer-Tropsch catalysts in a slurry reactor. The reactor operates in a back-mixed mode with a continuous flow of feed gas through the catalyst suspended in the liquid medium. Four catalysts with iron-manganese ratios of 57/43, 44/56, 22/78, and 10/90 were investigated at identical process conditions after a standard activation procedure. With time on stream for each catalyst system, hydrogenation of olefins occurred, along with olefin isomerization reactions. Activity, selectivity, and stability are discussed in general. Analyses of used catalyst samples are also reported. 20 refs., 2 figs., 4 tabs.

  11. Activation and promotion studies in a mixed slurry reactor with an iron-manganese Fischer-Tropsch catalyst

    SciTech Connect (OSTI)

    Pennline, H.W.; Zarochak, M.F.; Stencel, J.M.; Diehl, J.R.

    1987-03-01T23:59:59.000Z

    Synthesis gas was reacted over a coprecipitated iron-manganese Fischer-Tropsch catalyst in a slurry reactor. The effect of various activation parameters - temperature, pressure, and gas composition - on subsequent catalyst activity and product selectivity was investigated. The gas composition had the most dramatic effect on the catalyst activation and the ensuing synthesis gas conversion. The effect of potassium promotion on catalyst activity and product selectivity was also studied in slurry reactor tests.

  12. Control and diagnosis of temperature, density, and uniformity in x-ray heated iron/magnesium samples for opacity measurements

    SciTech Connect (OSTI)

    Nagayama, T.; Bailey, J. E.; Loisel, G.; Hansen, S. B.; Rochau, G. A. [Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)] [Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States); Mancini, R. C. [Physics Department, University of Nevada, Reno, Nevada 89557 (United States)] [Physics Department, University of Nevada, Reno, Nevada 89557 (United States); MacFarlane, J. J.; Golovkin, I. [Prism Computational Sciences, Madison, Wisconsin 53703 (United States)] [Prism Computational Sciences, Madison, Wisconsin 53703 (United States)

    2014-05-15T23:59:59.000Z

    Experimental tests are in progress to evaluate the accuracy of the modeled iron opacity at solar interior conditions, in particular to better constrain the solar abundance problem [S. Basu and H. M. Antia, Phys. Rep. 457, 217 (2008)]. Here, we describe measurements addressing three of the key requirements for reliable opacity experiments: control of sample conditions, independent sample condition diagnostics, and verification of sample condition uniformity. The opacity samples consist of iron/magnesium layers tamped by plastic. By changing the plastic thicknesses, we have controlled the iron plasma conditions to reach (1) T{sub e}?=?167?±?3?eV and n{sub e}?=?(7.1?±?1.5)×?10{sup 21}?cm{sup ?3}, (2) T{sub e}?=?170?±?2?eV and n{sub e}?=?(2.0?±?0.2)?×?10{sup 22}?cm{sup ?3}, and (3) T{sub e}?=?196?±?6?eV and n{sub e}?=?(3.8?±?0.8)?×?10{sup 22}?cm{sup ?3}, which were measured by magnesium tracer K-shell spectroscopy. The opacity sample non-uniformity was directly measured by a separate experiment where Al is mixed into the side of the sample facing the radiation source and Mg into the other side. The iron condition was confirmed to be uniform within their measurement uncertainties by Al and Mg K-shell spectroscopy. The conditions are suitable for testing opacity calculations needed for modeling the solar interior, other stars, and high energy density plasmas.

  13. Chemically bonded phosphate ceramics of trivalent oxides of iron and manganese

    DOE Patents [OSTI]

    Wagh, Arun S. (Orland Park, IL); Jeong, Seung-Young (Westmont, IL)

    2002-01-01T23:59:59.000Z

    A new method for combining elemental iron and other metals to form an inexpensive ceramic to stabilize arsenic, alkaline red mud wastes, swarfs, and other iron or metal-based additives, to create products and waste forms which can be poured or dye cast.

  14. Iron and Steel Phosphate Rock

    E-Print Network [OSTI]

    Torgersen, Christian

    Lime Lithium Magnesium Manganese Mercury Mica Molybdenum Nickel Nitrogen Peat Perlite Phosphate Rock . . . . . . . . . . . . . . . . . . . . . . . . 194 Appendix C--Resource/Reserve Definitions . . . . . . 195 Commodities: Abrasives (Manufactured

  15. Effects of iron and manganese in culture solution on their concentrations in roots and shoots of rice plants (Oryza sativa L.) grown under anaerobic conditions 

    E-Print Network [OSTI]

    Bacha, Richard E

    1976-01-01T23:59:59.000Z

    of higher oxides of Nn, and the residual Nn, is a minor constituent of soil minerals (Gotoh and Patrick, 1974). Soil Solution Iron and Manganese Ponnamperuma (1964) reported that the influence of pH on the solubility of Fe is particularly important... vary according to factors such as weathering of minerals, mineralization of organic matter, pH, and redox potential. Mann and 0uastel (1946) showed that Mn is biologically reduced in soils. Mann and 0uastei (1946), and 0uastel et al. , (1948...

  16. By Thomas S. Jones Manganese (Mn) is essential to iron and silicomanganese increased about 7%. consisted of, in tons, natural battery-grade ore,

    E-Print Network [OSTI]

    Torgersen, Christian

    . years of apparent consumption. 25. At yearend, the estimated manganese Ironmaking and steelmaking have to reported data, the rates of consumption of manganese as ore in ironmaking and as ferroalloys and metal

  17. By Thomas S. Jones Manganese (Mn) is essential to iron and steel production by have been among the larger producers. World production of

    E-Print Network [OSTI]

    Torgersen, Christian

    . Steelmaking, including its ironmaking Survey to three significant digits. Table footnotes will indicate. According to reported data, the rates of consumption of manganese as ore in ironmaking and as ferroalloys

  18. Cast B2-phase iron-aluminum alloys with improved fluidity

    DOE Patents [OSTI]

    Maziasz, Philip J. (122 Clark La., Oak Ridge, TN 37830); Paris, Alan M. (P.O. Box 64, Tarrs, PA 15688); Vought, Joseph D. (124 Cove Point Rd., Rockwood, TN 37854)

    2002-01-01T23:59:59.000Z

    Systems and methods are described for iron aluminum alloys. A composition includes iron, aluminum and manganese. A method includes providing an alloy including iron, aluminum and manganese; and processing the alloy. The systems and methods provide advantages because additions of manganese to iron aluminum alloys dramatically increase the fluidity of the alloys prior to solidification during casting.

  19. Production of magnesium metal

    DOE Patents [OSTI]

    Blencoe, James G. (Harriman, TN) [Harriman, TN; Anovitz, Lawrence M. (Knoxville, TN) [Knoxville, TN; Palmer, Donald A. (Oliver Springs, TN) [Oliver Springs, TN; Beard, James S. (Martinsville, VA) [Martinsville, VA

    2010-02-23T23:59:59.000Z

    A process of producing magnesium metal includes providing magnesium carbonate, and reacting the magnesium carbonate to produce a magnesium-containing compound and carbon dioxide. The magnesium-containing compound is reacted to produce magnesium metal. The carbon dioxide is used as a reactant in a second process. In another embodiment of the process, a magnesium silicate is reacted with a caustic material to produce magnesium hydroxide. The magnesium hydroxide is reacted with a source of carbon dioxide to produce magnesium carbonate. The magnesium carbonate is reacted to produce a magnesium-containing compound and carbon dioxide. The magnesium-containing compound is reacted to produce magnesium metal. The invention further relates to a process for production of magnesium metal or a magnesium compound where an external source of carbon dioxide is not used in any of the reactions of the process. The invention also relates to the magnesium metal produced by the processes described herein.

  20. Production of magnesium metal

    DOE Patents [OSTI]

    Blencoe, James G. (Harriman, TN); Anovitz, Lawrence M. (Knoxville, TN); Palmer, Donald A. (Oliver Springs, TN); Beard, James S. (Martinsville, VA)

    2012-04-10T23:59:59.000Z

    A process of producing magnesium metal includes providing magnesium carbonate, and reacting the magnesium carbonate to produce a magnesium-containing compound and carbon dioxide. The magnesium-containing compound is reacted to produce magnesium metal. The carbon dioxide is used as a reactant in a second process. In another embodiment of the process, a magnesium silicate is reacted with a caustic material to produce magnesium hydroxide. The magnesium hydroxide is reacted with a source of carbon dioxide to produce magnesium carbonate. The magnesium carbonate is reacted to produce a magnesium-containing compound and carbon dioxide. The magnesium-containing compound is reacted to produce magnesium metal. The invention also relates to the magnesium metal produced by the processes described herein.

  1. Impurity control and corrosion resistance of magnesium-aluminum alloy

    SciTech Connect (OSTI)

    Liu, M. [GM China Lab] [GM China Lab; Song, GuangLing [ORNL] [ORNL

    2013-01-01T23:59:59.000Z

    The corrosion resistance of magnesium alloys is very sensitive to the contents of impurity elements such as iron. In this study, a series of diecast AXJ530 magnesium alloy samples were prepared with additions of Mn and Fe. Through a comprehensive phase diagram calculation and corrosion evaluation, the mechanisms for the tolerance limit of Fe in magnesium alloy are discussed. This adds a new dimension to control the alloying impurity in terms of alloying composition design and casting conditions.

  2. Iron and Steel Phosphate Rock

    E-Print Network [OSTI]

    Torgersen, Christian

    Kyanite Lead Lime Lithium Magnesium Manganese Mercury Mica Molybdenum Nickel Nitrogen Peat Perlite Graphite Peat Sulfur Beryllium Gypsum Perlite Talc Bismuth Hafnium Phosphate Rock Tantalum Boron Helium information on the USGS--the Federal source for science about the Earth, its natural and living resources

  3. Iron and Steel Phosphate Rock

    E-Print Network [OSTI]

    Torgersen, Christian

    Kyanite Lead Lime Lithium Magnesium Manganese Mercury Mica Molybdenum Nickel Nitrogen Peat Perlite Niobium Stone Barite Gold Nitrogen Strontium Bauxite Graphite Peat Sulfur Beryllium Gypsum Perlite Talc, its natural and living resources, natural hazards, and the environment: World Wide Web: http

  4. The distribution of copper, manganese, zinc, and iron in antarctic waters and the relation of the concentrations of these metals to biological primary productivity

    E-Print Network [OSTI]

    Arhelger, Martin Edward

    1967-01-01T23:59:59.000Z

    - ? 7 centration of this species is only about 5 x 10 pg/1 (Cooper 193 7b) . The distribution of particulate iron in sea water appears to be rather inhomogeneous, especially near the coast (Cooper 1948a, b; Shaefer and Bishop 1958), but may be more... to the ferrous ion, have been described by Diehl and Smith (1960). None of the ions present in sea water at their normal concentrations interfere with these 12 reagents. Dipyridyl and tripyridyl were used by Cooper (1937a, b) in the English Channel...

  5. Formation of chemically bonded ceramics with magnesium dihydrogen phosphate binder

    DOE Patents [OSTI]

    Wagh, Arun S.; Jeong, Seung-Young

    2004-08-17T23:59:59.000Z

    A new method for combining magnesium oxide, MgO, and magnesium dihydrogen phosphate to form an inexpensive compactible ceramic to stabilize very low solubility metal oxides, ashes, swarfs, and other iron or metal-based additives, to create products and waste forms which can be poured or dye cast, and to reinforce and strengthen the ceramics formed by the addition of fibers to the initial ceramic mixture.

  6. Drinking Water Problems: Iron and Manganese (Spanish) 

    E-Print Network [OSTI]

    Dozier, Monty; McFarland, Mark L.

    2004-02-20T23:59:59.000Z

    tapa- dos y para calentar agua si los rodos de los calenta- dores est?n cubiertos con dep?sitos minerales. Esto aumenta los costos de la energ?a y el agua. El agua contaminada con hierro y manganeso usual- mente contiene bacterias de hierro o manganeso...

  7. Drinking Water Problems: Iron and Manganese (Spanish)

    E-Print Network [OSTI]

    Dozier, Monty; McFarland, Mark L.

    2004-02-20T23:59:59.000Z

    . Estas bacterias se alimentan de los minerales que hay en el agua. No causan problemas de salud, pero s? forman una baba rojiza-caf? (hierro) o caf?- negra (manganeso) en los tanques de los inodoros y pueden tapar los sistemas de agua. ?C?mo entran el.... Las part?culas se forman debido a que el ox?geno en el sistema de plomer?a est? oxidando y precipitando el hierro y el manganeso. Si el agua est? clara cuando sale del grifo, pero las part?culas se forman y se acumulan despu?s de que el agua ha estado...

  8. LOW TEMPERATURE VOC COMBUSTION OVER MANGANESE, COBALT AND ZINC ALPO4 MOLECULAR SIEVES

    SciTech Connect (OSTI)

    Rosemarie Szostak

    2003-03-06T23:59:59.000Z

    The objective of this project was to prepare microporous aluminophosphates containing magnesium, manganese, cobalt and zinc (MeAPOs) and to evaluate their performance as oxidation catalysts for the removal of low levels of volatile organic compounds (VOCs) from gas streams. The tasks to be accomplished were as follows: (1) To develop reliable synthesis methods for metal aluminophosphates containing manganese, cobalt and zinc in their framework; (2) To characterize these materials for crystallinity, phase purity, the location and nature of the incorporated metal in the framework; and (3) To evaluate the materials for their catalytic activities in the oxidation of volatile organic environmental pollutants.

  9. Method for production of magnesium

    DOE Patents [OSTI]

    Diaz, A.F.; Howard, J.B.; Modestino, A.J.; Peters, W.A.

    1998-07-21T23:59:59.000Z

    A continuous process for the production of elemental magnesium is described. Magnesium is made from magnesium oxide and a light hydrocarbon gas. In the process, a feed stream of the magnesium oxide and gas is continuously fed into a reaction zone. There the magnesium oxide and gas are reacted at a temperature of about 1400 C or greater in the reaction zone to provide a continuous product stream of reaction products, which include elemental magnesium. The product stream is continuously quenched after leaving the reaction zone, and the elemental magnesium is separated from other reaction products. 12 figs.

  10. Method for production of magnesium

    DOE Patents [OSTI]

    Diaz, Alexander F. (Cambridge, MA); Howard, Jack B. (Winchester, MA); Modestino, Anthony J. (Hanson, MA); Peters, William A. (Lexington, MA)

    1998-01-01T23:59:59.000Z

    A continuous process for the production of elemental magnesium is described. Magnesium is made from magnesium oxide and a light hydrocarbon gas. In the process, a feed stream of the magnesium oxide and gas is continuously fed into a reaction zone. There the magnesium oxide and gas are reacted at a temperature of about 1400.degree. C. or greater in the reaction zone to provide a continuous product stream of reaction products, which include elemental magnesium. The product stream is continuously quenched after leaving the reaction zone, and the elemental magnesium is separated from other reaction products.

  11. Process for removing technetium from iron and other metals

    DOE Patents [OSTI]

    Leitnaker, James M. (Kingston, TN); Trowbridge, Lee D. (Oak Ridge, TN)

    1999-01-01T23:59:59.000Z

    A process for removing technetium from iron and other metals comprises the steps of converting the molten, alloyed technetium to a sulfide dissolved in manganese sulfide, and removing the sulfide from the molten metal as a slag.

  12. Process for removing technetium from iron and other metals

    DOE Patents [OSTI]

    Leitnaker, J.M.; Trowbridge, L.D.

    1999-03-23T23:59:59.000Z

    A process for removing technetium from iron and other metals comprises the steps of converting the molten, alloyed technetium to a sulfide dissolved in manganese sulfide, and removing the sulfide from the molten metal as a slag. 4 figs.

  13. Climate VISION: Private Sector Initiatives: Magnesium: Resources...

    Office of Scientific and Technical Information (OSTI)

    Industry Associations International Magnesium Association Founded in 1943, the mission of the International Magnesium Association (IMA) is to promote the use of the metal magnesium...

  14. Electrodeposition of magnesium and magnesium/aluminum alloys

    DOE Patents [OSTI]

    Mayer, Anton (Los Alamos, NM)

    1988-01-01T23:59:59.000Z

    Electrolytes and plating solutions for use in processes for electroplating and electroforming pure magnesium and alloys of aluminum and magnesium and also electrodeposition processes. An electrolyte of this invention is comprised of an alkali metal fluoride or a quaternary ammonium halide, dimethyl magnesium and/or diethyl magnesium, and triethyl aluminum and/or triisobutyl aluminum. An electrolyte may be dissolved in an aromatic hydrocarbon solvent to form a plating solution. The proportions of the component compounds in the electrolyte are varied to produce essentially pure magnesium or magnesium/aluminum alloys having varying selected compositions.

  15. Electrodeposition of magnesium and magnesium/aluminum alloys

    DOE Patents [OSTI]

    Mayer, A.

    1988-01-21T23:59:59.000Z

    Electrolytes and plating solutions for use in processes for electroplating and electroforming pure magnesium and alloys of aluminum and magnesium and also electrodeposition processes. An electrolyte of this invention is comprised of an alkali metal fluoride or a quaternary ammonium halide, dimethyl magnesium and/or diethyl magnesium, and triethyl aluminum and/or triisobutyl aluminum. An electrolyte may be dissolved in an aromatic hydrocarbon solvent to form a plating solution. The proportions of the component compounds in the electrolyte are varied to produce essentially pure magnesium or magnesium/aluminum alloys having varying selected compositions.

  16. Method for the production of mineral wool and iron from serpentine ore

    SciTech Connect (OSTI)

    O'Connor, William K. (Albany, OR); Rush, Gilbert E. (Scio, OR); Soltau, Glen F. (Lebanon, OR)

    2011-10-11T23:59:59.000Z

    Magnesium silicate mineral wools having a relatively high liquidus temperature of at least about 1400.degree. C. and to methods for the production thereof are provided. The methods of the present invention comprise melting a magnesium silicate feedstock (e.g., comprising a serpentine or olivine ore) having a liquidus temperature of at least about 1400.degree. C. to form a molten magnesium silicate, and subsequently fiberizing the molten magnesium silicate to produce a magnesium silicate mineral wool. In one embodiment, the magnesium silicate feedstock contains iron oxide (e.g., up to about 12% by weight). Preferably, the melting is performed in the presence of a reducing agent to produce an iron alloy, which can be separated from the molten ore. Useful magnesium silicate feedstocks include, without limitation, serpentine and olivine ores. Optionally, silicon dioxide can be added to the feedstock to lower the liquidus temperature thereof.

  17. Action of manganese on puberty

    E-Print Network [OSTI]

    Lee, Bo Yeon

    2007-09-17T23:59:59.000Z

    Manganese (Mn) is considered important for normal growth and reproduction. Because Mn can cross the blood brain barrier and accumulate in the hypothalamus, and because it has been suggested that infants and children are potentially more sensitive...

  18. Heteroepitaxial Nucleation and Oriented Growth of Manganese

    E-Print Network [OSTI]

    Heteroepitaxial Nucleation and Oriented Growth of Manganese Oxide Islands on Carbonate Minerals-limit. Our results provide an improved basis both for the development of predictive models of contaminant Manganese oxide minerals in surface and groundwaters dissolve as Mn2+ (aq) and precipitate as manganese

  19. Synthesis of magnesium diboride by magnesium vapor infiltration process (MVIP)

    DOE Patents [OSTI]

    Serquis, Adriana C. (Los Alamos, NM); Zhu, Yuntian T. (Los Alamos, NM); Mueller, Frederick M. (Los Alamos, NM); Peterson, Dean E. (Los Alamos, NM); Liao, Xiao Zhou (Los Alamos, NM)

    2003-01-01T23:59:59.000Z

    A process of preparing superconducting magnesium diboride powder by heating an admixture of solid magnesium and amorphous boron powder or pellet under an inert atmosphere in a Mg:B ratio of greater than about 0.6:1 at temperatures and for time sufficient to form said superconducting magnesium diboride. The process can further include exposure to residual oxygen at high synthesis temperatures followed by slow cooling. In the cooling process oxygen atoms dissolved into MgB.sub.2 segregated to form nanometer-sized coherent Mg(B,O) precipitates in the MgB.sub.2 matrix, which can act as flux pinning centers.

  20. accumulate magnesium protoporphyrin: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    previous work that the exchangeable magnesium behaves similarly to exchangeable calcium. Daniel L. Gilbert 12 Constraining magnesium cycling in marine sediments using magnesium...

  1. Electrical behavior of natural manganese dioxide (NMD)

    SciTech Connect (OSTI)

    Gorgulho, H.F. [Fundacao de Ensino Superior de Sao Joao del Rei, Minas Gerais (Brazil); Fernandes, R.Z.D.; Pernaut, J.M. [Univ. Federal de Minas Gerais, Belo Horizonte, Minas Gerais (Brazil)

    1996-12-31T23:59:59.000Z

    NMD samples from Brazil have been submitted to magnetic and particle size separations and characterized by X-ray diffraction and fluorescence and thermogravimetric analyses. Results showed that simple physical treatments can lead to more than 60% enriched MnO{sub 2} materials which could satisfy some electrochemical applications. The electrical properties of the samples conditioned as pressed pellets have been investigated by four-points direct current probe and impedance spectroscopy, varying the conditions of preparation and measurement. It is proposed that the higher frequency impedance is equivalent to the intrinsic electronic resistance of the MnO{sub 2} phases while at lower frequencies occurs an interphase charge separation coupled with a possible ionic transport. The corresponding contact resistance depends on the particle size distribution of the material, the compactation pressure of pellets and the iron content of the materials. The interphase dielectric relaxation does not behave ideally; the depression of the impedance semicircles as shown in the Nyquist plane is assumed to be related to the roughness of the bulk interfaces. Recent developments have shown the possibility of using manganese oxides as reversible electrodes for battery or supercapacitor applications for electrical vehicle. In these perspectives it is important to study the electrical and electrochemical properties of NMD in order to estimate its suitability for this kind of applications.

  2. Electrical transport behavior of nonstoichiometric magnesium-zinc ferrite

    SciTech Connect (OSTI)

    Ghatak, S. [Department of Physics, National Institute of Technology, Deemed University, Mahatma Gandhi Avenue, Durgapur 713209, West Bengal (India)] [Department of Physics, National Institute of Technology, Deemed University, Mahatma Gandhi Avenue, Durgapur 713209, West Bengal (India); Sinha, M. [Department of Physics, University of Burdwan, Golapbag, Burdwan 713104, West Bengal (India)] [Department of Physics, University of Burdwan, Golapbag, Burdwan 713104, West Bengal (India); Meikap, A.K., E-mail: meikapnitd@yahoo.com [Department of Physics, National Institute of Technology, Deemed University, Mahatma Gandhi Avenue, Durgapur 713209, West Bengal (India); Pradhan, S.K. [Department of Physics, University of Burdwan, Golapbag, Burdwan 713104, West Bengal (India)] [Department of Physics, University of Burdwan, Golapbag, Burdwan 713104, West Bengal (India)

    2010-08-15T23:59:59.000Z

    This paper presents the direct current conductivity, alternate current conductivity and dielectric properties of nonstoichiometric magnesium-zinc ferrite below room temperature. The frequency exponent (s) of conductivity shows an anomalous temperature dependency. The magnitude of the temperature exponent (n) of dielectric permittivity strongly depends on frequency and its value decreases with increasing frequency. The grain boundary contribution is dominating over the grain contribution in conduction process and the temperature dependence of resistance due to grain and grain boundary contribution exhibits two activation regions. The ferrite shows positive alternating current magnetoconductivity. The solid state processing technique was used for the preparation of nanocrystalline ferrite powder from oxides of magnesium, zinc and iron. The X-ray diffraction methods were used in determining the structure and composition of obtained ferrite, while multimeter, impedance analyzer, liquid nitrogen cryostat and electromagnet were used in the study of conducting and dielectric properties of ferrite.

  3. New manganese catalyst for light alkane oxidation

    DOE Patents [OSTI]

    Durante, Vincent A. (West Chester, PA); Lyons, James E. (Wallingford, PA); Walker, Darrell W. (Visalia, CA); Marcus, Bonita K. (Radnor, PA)

    1994-01-01T23:59:59.000Z

    Aluminophosphates containing manganese in the structural framework are employed for the oxidation of alkanes, for example the vapor phase oxidation of methane to methanol.

  4. Manganese Oxide Composite Electrodes for Lithium Batteries |...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Manganese Oxide Composite Electrodes for Lithium Batteries Technology available for licensing: Improved spinel-containing "layered-layered" lithium metal oxide electrodes Materials...

  5. Iron acquisition and utilization by Rhodococcus equi: potential virulence factors

    E-Print Network [OSTI]

    Carnes, Misty Lee

    2002-01-01T23:59:59.000Z

    . . . . . . . . . . . . . . . . Growth of R. equi in minimal media (MM) and MM without iron 66 (MM-Fe) . . 67 12 13 Growth of R. equi in 100 ItM DIP + varying iron concentrations. . . . . . . . . 68 Effects of iron source (FeSO& or FeCls) onin vitro growth of R. equi. . . 69.... , virulence factors) against oxidative stress Three types of bacterial SODs have been described: those that contain either iron (Fe SOD), manganese (MnSOD), or copper-zinc (Cu-ZnSOD)(85). If the appropriate minerals are not available for production of SODs...

  6. Thermodynamic Investigations of Lithium- and Manganese-Rich Transition...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Thermodynamic Investigations of Lithium- and Manganese-Rich Transition Metal Oxides Thermodynamic Investigations of Lithium- and Manganese-Rich Transition Metal Oxides 2013 DOE...

  7. Examining Hysteresis in Lithium- and Manganese-Rich Composite...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Hysteresis in Lithium- and Manganese-Rich Composite Cathode Materials Examining Hysteresis in Lithium- and Manganese-Rich Composite Cathode Materials 2013 DOE Hydrogen and Fuel...

  8. Addressing the Voltage Fade Issue with Lithium-Manganese-Rich...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Addressing the Voltage Fade Issue with Lithium-Manganese-Rich Oxide Cathode Materials Addressing the Voltage Fade Issue with Lithium-Manganese-Rich Oxide Cathode Materials 2013 DOE...

  9. Addressing the Voltage Fade Issue with Lithium-Manganese-Rich...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Voltage Fade Issue with Lithium-Manganese-Rich Oxide Cathode Materials Addressing the Voltage Fade Issue with Lithium-Manganese-Rich Oxide Cathode Materials 2012 DOE Hydrogen and...

  10. Hair As A Biomarker Of Environmental Manganese Exposure

    E-Print Network [OSTI]

    Eastman, Rachel

    2012-01-01T23:59:59.000Z

    Neuropsychological correlates of hair arsenic, manganese,and physiology of hair. , Forensic Science International 63,D. (2010) High levels of hair manganese in children living

  11. Iron, zinc, and manganese distribution in mature soybean seeds

    E-Print Network [OSTI]

    Cvitanich, Cristina; Przyby?owicz, Wojciech J.; Mesjasz-Przyby?owicz, Jolanta; Blair, Matthew W.; Jensen, Erik Ø.; Stougaard, Jens

    2009-01-01T23:59:59.000Z

    Augustyniak M, et al. (2005) Micro-PIXE in ecophysiology. Xsensitive, non-destructive micro-PIXE (Particle Induced X-ICP-AES) in axial mode. Micro-PIXE analysis. Both dry and

  12. Comparing Well-Defined Manganese, Iron, Cobalt, and Nickel Ketone

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItem NotEnergy,ARMForms AboutRESEARCHHydrosilylation Catalysts Comparing Well-Defined

  13. Final Report on the Safety Assessment of Aluminum Silicate, Calcium Silicate, Magnesium Aluminum

    E-Print Network [OSTI]

    Ahmad, Sajjad

    Final Report on the Safety Assessment of Aluminum Silicate, Calcium Silicate, Magnesium Aluminum Silicate, Magnesium Silicate, Magnesium Trisilicate, Sodium Magnesium Silicate, Zirconium Silicate, Attapulgite, Bentonite, Fuller's Earth, Hectorite, Kaolin, Lithium Magnesium Silicate, Lithium Magnesium

  14. Synthesis of superconducting magnesium diboride objects

    DOE Patents [OSTI]

    Finnemore, Douglas K. (Ames, IA); Canfield, Paul C. (Ames, IA); Bud'ko, Sergey L. (Ames, IA); Ostenson, Jerome E. (Ames, IA); Petrovic, Cedomir (Ames, IA); Cunningham, Charles E. (Ames, IA); Lapertot, Gerard (Grenoble, FR)

    2003-08-15T23:59:59.000Z

    A process to produce magnesium diboride objects from boron objects with a similar form is presented. Boron objects are reacted with magnesium vapor at a predetermined time and temperature to form magnesium diboride objects having a morphology similar to the boron object's original morphology.

  15. Synthesis Of Superconducting Magnesium Diboride Objects.

    DOE Patents [OSTI]

    Finnemore, Douglas K. (Ames, IA); Canfield, Paul C. (Ames, IA); Bud'ko, Sergey L. (Ames, IA); Ostenson, Jerome E. (Ames, IA); Petrovic, Cedomir (Ames, IA); Cunningham, Charles E. (Ames, IA); Lapertot, Gerard (Grenoble, FR)

    2003-07-08T23:59:59.000Z

    A process to produce magnesium diboride objects from boron objects with a similar form is presented. Boron objects are reacted with magnesium vapor at a predetermined time and temperature to form magnesium diboride objects having a morphology similar to the boron object's original morphology.

  16. Transcriptome Analysis of Manganese-deficient Chlamydomonas reinhardtii Provides Insight on the Chlorophyll Biosynthesis Pathway

    SciTech Connect (OSTI)

    Lockhart, Ainsley; Zvenigorodsky, Natasha; Pedraza, Mary Ann; Lindquist, Erika

    2011-08-11T23:59:59.000Z

    The biosynthesis of chlorophyll and other tetrapyrroles is a vital but poorly understood process. Recent genomic advances with the unicellular green algae Chlamydomonas reinhardtii have created opportunity to more closely examine the mechanisms of the chlorophyll biosynthesis pathway via transcriptome analysis. Manganese is a nutrient of interest for complex reactions because of its multiple stable oxidation states and role in molecular oxygen coordination. C. reinhardtii was cultured in Manganese-deplete Tris-acetate-phosphate (TAP) media for 24 hours and used to create cDNA libraries for sequencing using Illumina TruSeq technology. Transcriptome analysis provided intriguing insight on possible regulatory mechanisms in the pathway. Evidence supports similarities of GTR (Glutamyl-tRNA synthase) to its Chlorella vulgaris homolog in terms of Mn requirements. Data was also suggestive of Mn-related compensatory up-regulation for pathway proteins CHLH1 (Manganese Chelatase), GUN4 (Magnesium chelatase activating protein), and POR1 (Light-dependent protochlorophyllide reductase). Intriguingly, data suggests possible reciprocal expression of oxygen dependent CPX1 (coproporphyrinogen III oxidase) and oxygen independent CPX2. Further analysis using RT-PCR could provide compelling evidence for several novel regulatory mechanisms in the chlorophyll biosynthesis pathway.

  17. MANGANESE--2003 48.1 By Lisa A. Corathers

    E-Print Network [OSTI]

    Torgersen, Christian

    , including its ironmaking component, has accounted for most of the domestic manganese demand, presently

  18. Substrate and method for the formation of continuous magnesium diboride and doped magnesium diboride wire

    DOE Patents [OSTI]

    Suplinskas, Raymond J. (Haverhill, MA); Finnemore, Douglas (Ames, IA); Bud'ko, Serquei (Ames, IA); Canfield, Paul (Ames, IA)

    2007-11-13T23:59:59.000Z

    A chemically doped boron coating is applied by chemical vapor deposition to a silicon carbide fiber and the coated fiber then is exposed to magnesium vapor to convert the doped boron to doped magnesium diboride and a resultant superconductor.

  19. Method for magnesium sulfate recovery

    DOE Patents [OSTI]

    Gay, R.L.; Grantham, L.F.

    1987-08-25T23:59:59.000Z

    A method is described for obtaining magnesium sulfate substantially free from radioactive uranium from a slag containing the same and having a radioactivity level of at least about 7,000 pCi/gm. The slag is ground to a particle size of about 200 microns or less. The ground slag is then contacted with a concentrated sulfuric acid under certain prescribed conditions to produce a liquid product and a solid product. The particulate solid product and a minor amount of the liquid is then treated to produce a solid residue consisting essentially of magnesium sulfate substantially free of uranium and having a residual radioactivity level of less than 1,000 pCi/gm. In accordance with the preferred embodiment of the invention, a catalyst and an oxidizing agent are used during the initial acid treatment and a final solid residue has a radioactivity level of less than about 50 pCi/gm.

  20. Climate VISION: Private Sector Initiatives: Magnesium

    Office of Scientific and Technical Information (OSTI)

    Leading magnesium producers and casting companies are working with the U.S. Environmental Protection Agency (EPA) to alleviate the global environmental threat of climate...

  1. Coordination Chemistry in magnesium battery electrolytes: how...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    a safe, cost-effective, and high energy density technology for large scale energy storage. However, the development of magnesium battery has been hindered by the limited...

  2. Climate VISION: Private Sector Initiatives: Magnesium: Resources...

    Office of Scientific and Technical Information (OSTI)

    Washington in February of 2002. The paper briefly describes the issues surrounding climate change and the Magnesium Industry, and gives an overview of the SF6 Emission...

  3. Climate VISION: Private Sector Initiatives: Magnesium: Resources...

    Office of Scientific and Technical Information (OSTI)

    Plant Assessments Greenhouse Gas Protocol (PDF 190 KB) Download Acrobat Reader Paper written by Bill Palmer, Cheminfo Services, Inc. Molten magnesium and its alloys are volatile...

  4. Aerobic oxidation of anthracene in the presence of manganese porphyrinates and NaBH/sub 4/ reducing agent

    SciTech Connect (OSTI)

    Lukashova, E.A.; Solov'ev, A.B.; Chugreev, A.L.; Enikolopyan, N.S.

    1987-12-01T23:59:59.000Z

    The authors investigate the kinetics of anthracene oxidation by molecular oxygen in the presence of manganese, iron, and cobalt porphyrinate catalysts and a sodium borohydride reducing agent at room temperature in solutions of ethanol or ethanol with chloroform and benzene. Effective rate constants for the reactions are determined based on the amount of anthraquinone formed in the reaction. In all cases with the exception of cobalt tetraphenylporphyrinate the only oxidation product was anthraquinone. Its structure was verified by NMR and IR spectroscopy.

  5. Solid Oxide Membrane (SOM) Electrolysis of Magnesium: Scale-Up...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Oxide Membrane (SOM) Electrolysis of Magnesium: Scale-Up Research and Engineering for Light-Weight Vehicles Solid Oxide Membrane (SOM) Electrolysis of Magnesium: Scale-Up Research...

  6. Climate VISION: Private Sector Initiatives: Magnesium: Work Plans

    Office of Scientific and Technical Information (OSTI)

    Magnesium Association has developed a work plan for achieving the industry's Climate VISION commitment. Read the International Magnesium Association Work Plan (PDF 92 KB)...

  7. Local environment and composition of magnesium gallium layered...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    environment and composition of magnesium gallium layered double hydroxides determined from solid-state 1H and 71Ga NMR Local environment and composition of magnesium gallium...

  8. Tissue magnesium and calcium concentration in relation to magnesium and calcium intake in rats 

    E-Print Network [OSTI]

    Pinkham, Carrie Stanton

    1987-01-01T23:59:59.000Z

    , gestation, and lactation. The diets fed were as follows: low magnesium (200 mg Ng/kg and 5, 000 mg Ca/kg); calcium? supplemented (1, 200 mg Ng/kg and 16, 000 mg Ca/kg); low magnesium, calcium-supplemented (200 mg Ng/kg and 16, 000 mg Ca/kg); and control... was affected adversely by magnesium restriction; litter size was smaller and mortality rates the highest in animals fed the 1 cw magnesium diet. Pups of the magnesium ? restricted dams were lightest on Days 3 and 6 of lactation, while the pups of the dams...

  9. MANGANESE--1998 49.1 By Thomas S. Jones

    E-Print Network [OSTI]

    Torgersen, Christian

    -carbon ferromanganese. In manganese-containing dry cell batteries, the feasibility of recycling such batteries aluminum alloys and is used in oxide form in dry cell batteries. The overall level and nature of manganese year 1998 was 18,144 metric tons (t) for natural battery-grade ore, 2,732 t for synthetic manganese

  10. Silver manganese oxide electrodes for lithium batteries

    DOE Patents [OSTI]

    Thackeray, Michael M.; Vaughey, John T.; Dees, Dennis W.

    2006-05-09T23:59:59.000Z

    This invention relates to electrodes for non-aqueous lithium cells and batteries with silver manganese oxide positive electrodes, denoted AgxMnOy, in which x and y are such that the manganese ions in the charged or partially charged electrodes cells have an average oxidation state greater than 3.5. The silver manganese oxide electrodes optionally contain silver powder and/or silver foil to assist in current collection at the electrodes and to improve the power capability of the cells or batteries. The invention relates also to a method for preparing AgxMnOy electrodes by decomposition of a permanganate salt, such as AgMnO4, or by the decomposition of KMnO4 or LiMnO4 in the presence of a silver salt.

  11. Secondary cell with orthorhombic alkali metal/manganese oxide phase active cathode material

    DOE Patents [OSTI]

    Doeff, M.M.; Peng, M.Y.; Ma, Y.; Visco, S.J.; DeJonghe, L.C.

    1996-09-24T23:59:59.000Z

    An alkali metal manganese oxide secondary cell is disclosed which can provide a high rate of discharge, good cycling capabilities, good stability of the cathode material, high specific energy (energy per unit of weight) and high energy density (energy per unit volume). The active material in the anode is an alkali metal and the active material in the cathode comprises an orthorhombic alkali metal manganese oxide which undergoes intercalation and deintercalation without a change in phase, resulting in a substantially linear change in voltage with change in the state of charge of the cell. The active material in the cathode is an orthorhombic structure having the formula M{sub x}Z{sub y}Mn{sub (1{minus}y)}O{sub 2}, where M is an alkali metal; Z is a metal capable of substituting for manganese in the orthorhombic structure such as iron, cobalt or titanium; x ranges from about 0.2 in the fully charged state to about 0.75 in the fully discharged state, and y ranges from 0 to 60 atomic %. Preferably, the cell is constructed with a solid electrolyte, but a liquid or gelatinous electrolyte may also be used in the cell. 11 figs.

  12. Secondary cell with orthorhombic alkali metal/manganese oxide phase active cathode material

    DOE Patents [OSTI]

    Doeff, Marca M. (Hayward, CA); Peng, Marcus Y. (Cupertino, CA); Ma, Yanping (Albany, CA); Visco, Steven J. (Berkeley, CA); DeJonghe, Lutgard C. (Lafayette, CA)

    1996-01-01T23:59:59.000Z

    An alkali metal manganese oxide secondary cell is disclosed which can provide a high rate of discharge, good cycling capabilities, good stability of the cathode material, high specific energy (energy per unit of weight) and high energy density (energy per unit volume). The active material in the anode is an alkali metal and the active material in the cathode comprises an orthorhombic alkali metal manganese oxide which undergoes intercalation and deintercalation without a change in phase, resulting in a substantially linear change in voltage with change in the state of charge of the cell. The active material in the cathode is an orthorhombic structure having the formula M.sub.x Z.sub.y Mn.sub.(1-y) O.sub.2, where M is an alkali metal; Z is a metal capable of substituting for manganese in the orthorhombic structure such as iron, cobalt or titanium; x ranges from about 0.2 in the fully charged state to about 0.75 in the fully discharged state, and y ranges from 0 to 60 atomic %. Preferably, the cell is constructed with a solid electrolyte, but a liquid or gelatinous electrolyte may also be used in the cell.

  13. Lack of iron | EMSL

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Lack of iron Lack of iron Released: February 26, 2014 Iron-bearing minerals in sediments naturally reduce contaminant levels The Science The release of wastes associated with...

  14. Magnesium Front End Design and Development

    Broader source: Energy.gov (indexed) [DOE]

    by: Alan A. Luo and R. C. McCune Presented by: James Quinn, General Motors Unibody Architecture 3-piece Mg front end (bodyframe) USAMP AMD 603 - Magnesium Front End Design and...

  15. Magnesium Research and Technology Development: Project 48976

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Advise DOE on criticalkey funding areas for Mg 3 z z Approach Approach Approach Increase automotive industry awareness in the use of Mg Develop and maintain the Magnesium R&D...

  16. Climate VISION: Private Sector Initiatives: Magnesium

    Office of Scientific and Technical Information (OSTI)

    atmosphere, SF6 will persist for 3,200 years and is more than 23,000 times as strong a global warming gas as carbon dioxide (CO2). Read the U.S. and International Magnesium...

  17. Magnesium-phosphate-glass cements with ceramic-type properties

    DOE Patents [OSTI]

    Sugama, T.; Kukacka, L.E.

    1982-09-23T23:59:59.000Z

    Rapid setting magnesium phosphate (Mg glass) cementitious materials consisting of magnesium phosphate cement paste, polyborax and water-saturated aggregate, exhibits rapid setting and high early strength characteristics. The magnesium glass cement is prepared from a cation-leachable powder and a bivalent metallic ion-accepting liquid such as an aqueous solution of diammonium phosphate and ammonium polyphosphate. The cation-leachable powder includes a mixture of two different magnesium oxide powders processed and sized differently which when mixed with the bivalent metallic ion-accepting liquid provides the magnesium glass cement consisting primarily of magnesium ortho phosphate tetrahydrate, with magnesium hydroxide and magnesium ammonium phosphate hexahydrate also present. The polyborax serves as a set-retarder. The resulting magnesium mono- and polyphosphate cements are particularly suitable for use as a cementing matrix in rapid repair systems for deteriorated concrete structures as well as construction materials and surface coatings for fireproof structures.

  18. Magnesium phosphate glass cements with ceramic-type properties

    DOE Patents [OSTI]

    Sugama, Toshifumi (Mastic Beach, NY); Kukacka, Lawrence E. (Port Jefferson, NY)

    1984-03-13T23:59:59.000Z

    Rapid setting magnesium phosphate (Mg glass) cementitious materials consisting of magnesium phosphate cement paste, polyborax and water-saturated aggregate exhibiting rapid setting and high early strength characteristics. The magnesium glass cement is prepared from a cation-leachable powder and a bivalent metallic ion-accepting liquid such as an aqueous solution of diammonium phosphate and ammonium polyphosphate. The cation-leachable powder includes a mixture of two different magnesium oxide powders processed and sized differently which when mixed with the bivalent metallic ion-accepting liquid provides the magnesium glass cement consisting primarily of magnesium ortho phosphate tetrahydrate, with magnesium hydroxide and magnesium ammonium phosphate hexahydrate also present. The polyborax serves as a set-retarder. The resulting magnesium mono- and polyphosphate cements are particularly suitable for use as a cementing matrix in rapid repair systems for deteriorated concrete structures as well as construction materials and surface coatings for fireproof structures.

  19. Synthesis and Characterization of Magnesium-Silicon and Magnesium-Tin Solid Solutions for Thermoelectric Applications

    E-Print Network [OSTI]

    Hu, Fang

    2012-07-16T23:59:59.000Z

    time curves have been researched in this thesis for fully reacted magnesium-silicide & magnesium-stannide green ingots with doping materials i.e. antimony, bismuth by different doping ratios. These ingots were ground by a high energy ball miller...

  20. Synthesis and Characterization of Magnesium-Silicon and Magnesium-Tin Solid Solutions for Thermoelectric Applications 

    E-Print Network [OSTI]

    Hu, Fang

    2012-07-16T23:59:59.000Z

    time curves have been researched in this thesis for fully reacted magnesium-silicide & magnesium-stannide green ingots with doping materials i.e. antimony, bismuth by different doping ratios. These ingots were ground by a high energy ball miller...

  1. Hydrogen storage characteristics of nanograined free-standing magnesium–nickel films

    E-Print Network [OSTI]

    2009-01-01T23:59:59.000Z

    free-standing magnesium–nickel ?lms Matthew Rogers · StevenFree-standing magnesium–nickel (Mg–Ni) ?lms with extensivefree- standing magnesium–nickel ?lms. Magnesium hydride (MgH

  2. The Influence of Spray Water Quality on Herbicide www.btny.purdue.edu/weedscience

    E-Print Network [OSTI]

    calcium, magnesium, iron, aluminum, zinc, manganese, sodium, potassium, cesium, and lithium can influence be difficult. When the spray tank is not cleaned properly, leftover traces of the herbicide can contaminate

  3. Promises and Challenges of Lithium- and Manganese-Rich Transition...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Electrochemical Modeling of LMR-NMC Materials and Electrodes Addressing the Voltage Fade Issue with Lithium-Manganese-Rich Oxide Cathode Materials PHEV Battery Cost Assessment...

  4. address arsenic manganese: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    mobilization in the critical zone: Oxidation by manganese oxide minerals Environmental Management and Restoration Websites Summary: . Lafferty2, Donald L. Sparks1. (1)...

  5. Manganese-Based Magnets: Manganese-Based Permanent Magnet with 40 MGOe at 200°C

    SciTech Connect (OSTI)

    None

    2012-01-01T23:59:59.000Z

    REACT Project: PNNL is working to reduce the cost of wind turbines and EVs by developing a manganese-based nano-composite magnet that could serve as an inexpensive alternative to rare-earth-based magnets. The manganese composite, made from low-cost and abundant materials, could exceed the performance of today’s most powerful commercial magnets at temperature higher than 200°C. Members of PNNL’s research team will leverage comprehensive computer high-performance supercomputer modeling and materials testing to meet this objective. Manganese-based magnets could withstand higher temperatures than their rare earth predecessors and potentially reduce the need for any expensive, bulky engine cooling systems for the motor and generator. This would further contribute to cost savings for both EVs and wind turbines.

  6. Friction Stir and Ultrasonic Solid State Joining of Magnesium...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    and Ultrasonic Solid State Joining of Magnesium to Steel Friction Stir and Ultrasonic Solid State Joining of Magnesium to Steel 2012 DOE Hydrogen and Fuel Cells Program and Vehicle...

  7. Texture Control by Selective Deformation Mechanism Activation in Magnesium Alloy

    E-Print Network [OSTI]

    Foley, David Christopher

    2014-07-01T23:59:59.000Z

    The need for high strength, light weight structures in automotive and aerospace applications has driven a resurgence of interest in magnesium and its alloys. Unlike aluminum, wrought magnesium typically has a high degree of mechanical anisotropy...

  8. Texture Control by Selective Deformation Mechanism Activation in Magnesium Alloy 

    E-Print Network [OSTI]

    Foley, David Christopher

    2014-07-01T23:59:59.000Z

    The need for high strength, light weight structures in automotive and aerospace applications has driven a resurgence of interest in magnesium and its alloys. Unlike aluminum, wrought magnesium typically has a high degree of mechanical anisotropy...

  9. AMD 601 High Integrity -Magnesium Automotive Components (HI-MAC...

    Energy Savers [EERE]

    601 High Integrity -Magnesium Automotive Components (HI-MAC) AMD 601 High Integrity -Magnesium Automotive Components (HI-MAC) Presentation from the U.S. DOE Office of Vehicle...

  10. The magnesium nutrition of American upland and Egyptian cottons 

    E-Print Network [OSTI]

    Helmy, Hussein

    1956-01-01T23:59:59.000Z

    ~ ~ ~ ~ ~ ~ ~ ~ 19 ~ ~ ~ SS ~ ~ ~ ~ ~ ~ ~ S7 LIST OF TABLES Page Effect of magnesium on stem he1ghts . . . 52 Relation of magnesium supply to average fresh and dry weight of cotton plants at 45 days ~ ~ \\ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 55 Relation of magnesium supply... to average fresh and dry weight of cotton plants at 85 days ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 54 Relation of magnesium supply to average number of flowers produced per plant 1n three day intervals, percentage shedding, percentage boll-set and rel- ative...

  11. Electrodeposition of aluminium, aluminium/magnesium alloys, and magnesium from organometallic electrolytes

    SciTech Connect (OSTI)

    Mayer, A.

    1988-01-01T23:59:59.000Z

    The electrodeposition of aluminum, magnesium, and the combination of these metals from nonaqueous media is discussed. Plating baths for depositing Al/Mg alloys or for plating essentially pure Mg were developed. These solutions contain alkali meal fluoride or quaternary ammonium halide/aluminium alkyl complexes and dialkyl magnesium dissolved in aromatic hydrocarbons. Alloy deposits over the whole composition range can be plated from these solutions by varying the relative quantities of the aluminium and magnesium alkyls and by changing the bath-operating parameters. 18 refs., 4 figs.

  12. SOLID STATE JOINING OF MAGNESIUM TO STEEL

    SciTech Connect (OSTI)

    Jana, Saumyadeep; Hovanski, Yuri; Pilli, Siva Prasad; Field, David P.; Yu, Hao; Pan, Tsung-Yu; Santella, M. L.

    2012-06-04T23:59:59.000Z

    Friction stir welding and ultrasonic welding techniques were applied to join automotive magnesium alloys to steel sheet. The effect of tooling and process parameters on the post-weld microstructure, texture and mechanical properties was investigated. Static and dynamic loading were utilized to investigate the joint strength of both cast and wrought magnesium alloys including their susceptibility and degradation under corrosive media. The conditions required to produce joint strengths in excess of 75% of the base metal strength were determined, and the effects of surface coatings, tooling and weld parameters on weld properties are presented.

  13. MANGANESE--2001 49.1 By Lisa A. Corathers

    E-Print Network [OSTI]

    Torgersen, Christian

    MANGANESE--2001 49.1 MANGANESE By Lisa A. Corathers Domestic survey data and tables were prepared by 11%, while the number of units imported declined by 19%. While 2001 prices of ore continued the rising trend of 2000, prices of ferroalloys fell in 2001. The amount of increase for metallurgical

  14. Effect of quantity and route of administration of manganese monoxide on feed intake and serum manganese in ruminants

    SciTech Connect (OSTI)

    Black, J.R.; Ammerman, C.B.; Henry, P.R.

    1985-02-01T23:59:59.000Z

    The experiment investigated effects of high quantities of manganese and route of administration (diet versus capsule-dosed) on feed intake and blood characteristics in sheep. Twenty-four Florida native or Florida native by St. Croix crossbred wethers, 47 kg initially, were assigned randomly to eight treatments including basal diet supplemented with 0, 3000, 6000, or 9000 ppm manganese as a reagent grade manganese monoxide or basal diet plus gelatin capsules containing the equivalent of 0, 3000, 6000, or 9000 ppm manganese based on intake of the previous day. Three sheep per treatment were provided feed and tap water for ad libitum intake. Sheep were fed basal diet for 7 days followed by a 21-day experimental period, then placed back on the basal diet for 7 days. Average daily feed intake was reduced by increasing supplemental manganese, regardless of route. Animals dosed by capsule consumed less feed than those administered manganese in the diet. Serum manganese increased as manganese supplementation increased, but route of administration had no effect.

  15. Passive removal of manganese from acid mine drainage

    SciTech Connect (OSTI)

    Brant, D.L.; Ziemkiewicz, P.F. [West Virginia Univ., Morgantown, WV (United States)

    1997-12-31T23:59:59.000Z

    Removal of manganese (Mn) from mine drainage is difficult due to the abnormal chemistry of the element. The removal requires the oxidation of Mn(II) (the form found in mine drainage) to the more oxidized forms (Mn(III) or Mn(IV)). The more oxidized forms exist only as solids and will not return to Mn(II) spontaneously. Chemical treatment of Mn often requires a pH near 10 to initiate the oxidation quickly. A stabilized pH of 10 normally causes more harm to aquatic organisms than the Mn and is not desirable, making additional steps in the treatment necessary. Biological removal of Mn can be achieved at near neutral pH levels. The Shade Mining site in Somerset County, PA has been treating Mn to discharge limits since the early 1990`s (reducing Mn concentrations from 12 - 25 mg/L in the influent to <2 mg/L in the effluent). The treatment system consists of an anoxic limestone drain discharging into a wetland to remove iron, aluminum, and acidity, while increasing pH and alkalinity. The wetland effluent flows into two limestone beds (Mn removal). The limestone beds developed a black slime coating as the Mn removal increased. This system continues to remove Mn in all weather conditions and has not required chemical treatment since the black coating appeared on the limestone. A laboratory study was conducted using limestone collected from the Shade site to use the same naturally occurring Mn oxidizing microbes. The lab study compared W removal rates of microbial oxidation, MnO{sub 2} catalyzed limestone, and fresh uncoated limestone. The microbial removal performed the best (25 mg/L Mn reduced to <2 mg/L in 72 hours).

  16. Iron and Prochlorococcus/

    E-Print Network [OSTI]

    Thompson, Anne Williford

    2009-01-01T23:59:59.000Z

    Iron availability and primary productivity in the oceans are intricately linked through photosynthesis. At the global scale we understand how iron addition induces phytoplankton blooms through meso-scale iron-addition ...

  17. Assessment of the magnesium primary production technology. Final report

    SciTech Connect (OSTI)

    Flemings, M.C.; Kenney, G.B.; Sadoway, D.R.; Clark, J.P.; Szekely, J.

    1981-02-01T23:59:59.000Z

    At current production levels, direct energy savings achievable in primary magnesium production are 1.2 milliquads of energy per annum. Were magnesium to penetrate the automotive market to an average level of 50 pounds per vehicle, the resultant energy savings at the production stage would be somewhat larger, but the resulting savings in gasoline would conserve an estimated 325 milliquads of energy per year. The principal barrier to more widespread use of magnesium in the immediate future is its price. A price reduction of magnesium of 10% would lead to widespread conversion of aluminum die and permanent mold castings to magnesium. This report addresses the technology of electrolytic and thermic magnesium production and the economics of expanded magnesium production and use.

  18. Investigating Iron Ions | EMSL

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Investigating Iron Ions Investigating Iron Ions Computer code provides detailed predictions of highly charged ions in water Using resources at EMSL, scientists obtained...

  19. Manganese in Texas Soils and its Relation to Crops.

    E-Print Network [OSTI]

    Carlyle, E. C. (Elmer Cardinal)

    1931-01-01T23:59:59.000Z

    manganese salts in pot ex1 rnents to a productive Hagerstown loam from the plots of the PC sylvania Experiment Station. The soil was slightly acid, and they tained no beneficial results with wheat. Skinner and Reid ~eported in 1916 (17) a six-year test... wit11 wh rye, corn, and soy beans, on an acicl silty clay loam soil at the Esp ment Station farm at Arlington, Virginia.. When no manganese fate was used, one acre yielded 4192 pounds of wheat straw and grz , with manganese the yielcl was 3258...

  20. Soil tests for copper, iron, manganese, and zinc in histosols. 2. The distributions of soil iron and manganese in sequentially extractable forms

    SciTech Connect (OSTI)

    Mathur, S.P.; Levesque, M.

    1988-02-01T23:59:59.000Z

    The authors identified and quantified the immediately available and the reserve forms of Fe and Mn in 55 cultivated organic solid to assist selection of a reliable soil test for Fe and Mn in such soils. Soil Fe and Mn were sequentially partitioned into (1) H/sub 2/O-soluble, (2) Ca-exchangeable, (3) free-oxide-associated, (4) weakly complexed, (5) strongly complexed, (6) carbonate-associated, and (7) sulfide-associated extractable forms by dissolution in (1) H/sub 2/O, and aqueous solutions of (2) CaCl/sub 2/, (3) CaCl/sub 2/ + hydroquinone, (4) CH/sub 3/COOH; (5) DTPA-TEA, (6) HCl, and (7) KCN, respectively. On an average, 66% of the total Fe was unextractable, 26% strongly complexed, 4% sulfide-associated, 3% in carbonates, 0.5% weakly complexed, 0.4% in association with free oxides, 0.2% H/sub 2/O-soluble, and 0.1% Ca-exchangeable. Of the average total Mn, 57% was unextractable, 18% associated with free oxides, 10% weakly complexed, 6.5% each strongly complexed and Ca-exchangeable, 0.9% in carbonates, 0.4% in sulfide, and 0.5% in H/sub 2/O-soluble forms. Of the average total Zn, 8.7% was in free oxides, 4.5% Ca-exchangeable, and 1.9% in H/sub 2/O-soluble forms. The immediately available forms of Fe in H/sub 2/O-soluble and Ca-exchangeable factions were indicated to be replenishable mainly by the strongly complexed form. The capacity factor for Mn was suggested to be more than one form of soil Mn.

  1. (Data in thousand metric tons gross weight unless otherwise specified) Domestic Production and Use: Manganese ore containing 35% or more manganese was not produced domestically

    E-Print Network [OSTI]

    Torgersen, Christian

    as production of dry cell batteries, plant fertilizers and animal feed, and as a brick colorant. Manganese Recycling: Manganese was recycled incidentally as a minor constituent of ferrous and nonferrous scrap inventory inventory for disposal FY 2006 FY 2006 Manganese ore: Battery grade -- 18 -- 27 -- Chemical grade

  2. (Data in thousand metric tons gross weight unless otherwise specified) Domestic Production and Use: Manganese ore containing 35% or more manganese was not produced domestically

    E-Print Network [OSTI]

    Torgersen, Christian

    as production of dry cell batteries, in plant fertilizers and animal feed, and as a brick colorant. Manganese of apparent consumption 100 100 100 100 100 Recycling: Manganese was recycled incidentally as a minor inventory inventory for disposal FY 2007 FY 2007 Manganese ore: Battery grade 16 2 16 27 2 Chemical grade 0

  3. (Data in thousand metric tons gross weight unless otherwise specified) Domestic Production and Use: Manganese ore containing 35% or more manganese was not produced

    E-Print Network [OSTI]

    Torgersen, Christian

    as production of dry cell batteries, plant fertilizers and animal feed, and as a brick colorant. Manganese Recycling: Manganese was recycled incidentally as a minor constituent of ferrous and nonferrous scrap inventory inventory for disposal FY 2005 FY 2005 Manganese ore: Battery grade -- 18 -- 27 23 Chemical grade

  4. (Data in thousand metric tons gross weight unless otherwise specified) Domestic Production and Use: Manganese ore containing 35% or more manganese was not produced domestically

    E-Print Network [OSTI]

    Torgersen, Christian

    as production of dry cell batteries, in plant fertilizers and animal feed, and as a brick colorant. Manganese 100 100 100 100 Recycling: Manganese was recycled incidentally as a minor constituent of ferrous FY 2008 FY 2008 Manganese ore: Battery grade -- -- 18 16 Chemical grade -- -- -- -- Metallurgical

  5. Lead magnesium niobate actuator for micropositioning

    DOE Patents [OSTI]

    Swift, C.D.; Bergum, J.W.

    1994-10-25T23:59:59.000Z

    An improved lead magnesium niobate actuator is disclosed comprising a cylindrical lead magnesium niobate crystal stack mounted in a cylindrical casing wherein a bias means, such as one or more belleville washers, is located between one end of the crystal stack and a partially closed end of the casing; and adjustment means are provided which bear against the opposite end of the crystal stack, whereby an adjustable compressive force is constantly applied against the crystal stack, whether the crystal stack is actuated in an extended position, or is in an unactuated contracted position. In a preferred embodiment, cooling ports are provided for the circulation of coolant in the actuator to cool the crystal stack, and provision is made for removal and replacement of the crystal stack without disconnecting the actuator from the external device being actuated. 3 figs.

  6. Lead magnesium niobate actuator for micropositioning

    DOE Patents [OSTI]

    Swift, Charles D. (Livermore, CA); Bergum, John W. (Concord, CA)

    1994-01-01T23:59:59.000Z

    An improved lead magnesium niobate actuator is disclosed comprising a cylindrical lead magnesium niobate crystal stack mounted in a cylindrical casing wherein a bias means, such as one or more belleville washers, is located between one end of the crystal stack and a partially closed end of the casing; and adjustment means are provided which bear against the opposite end of the crystal stack, whereby an adjustable compressive force is constantly applied against the crystal stack, whether the crystal stack is actuated in an extended position, or is in an unactuated contracted position. In a preferred embodiment, cooling ports are provided for the circulation of coolant in the actuator to cool the crystal stack, and provision is made for removal and replacement of the crystal stack without disconnecting the actuator from the external device being actuated.

  7. Molecular Interactions of Plutonium(VI) with SyntheticManganese...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    on the surface of well-characterized synthetic manganese-substituted goethite minerals (Fe1-xMnxOOH) was studied using X-ray absorption spectroscopy. We chose to study the...

  8. Electrochromic reactions in manganese oxides I. Raman analysis

    SciTech Connect (OSTI)

    Bernard, M.C.; Hugot-Le Goff, A.; Thi, B.V. (Univ. Pierre et Marie Curie, Paris (France). UPR 15 du CNRS Physique des Liquides et Electrochimie); Cordoba de Torresi, S. (Univ. Estadual de Campinas (Brazil). Dept. de Fisica Aplicada)

    1993-11-01T23:59:59.000Z

    Like nickel oxide, manganese oxide is a widely studied material in the primary batteries field. The reactions taking place during voltametric cycling of manganese oxides can be determined using in situ Raman spectroscopy. The main difficulty for the oxide identification is to obtain relevant Raman reference spectra because of the many possible compounds and, for some of these compounds, of their instability in the laser beam. As a consequence, several modifications of different tetra-, tri- and divalent manganese oxides and oxyhydroxides were carefully studied. The electrochromic behavior of three types of manganese oxides, two prepared by thermal oxidations and the other by electrochemical deposition, were then compared. The presence of nonstoichiometry in the pristine material was necessary to obtain a reversible electrochromic effect. The reaction during electrochromic cycling is more complicated than a simple passage from MnO[sub 2] to MnOOH.

  9. Manganese Based Oxidative Technologies For Water/Wastewater Treatment 

    E-Print Network [OSTI]

    Desai, Ishan

    2013-08-27T23:59:59.000Z

    Manganese is a commonly occurring mineral found in soil and sediments that takes part in chemical reactions in groundwater and soil systems. It plays a significant role in controlling the environmental fate and transport ...

  10. antenatal magnesium sulfate: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    was reduced by 30 % at 48 hours of the treatment. Results. After magnesium sulfate infusion, 90 % prolonged their pregnancy for>48 hours. Combination therapy was effective in 95...

  11. Climate VISION: Private Sector Initiatives: Magnesium: GHG Inventory...

    Office of Scientific and Technical Information (OSTI)

    GHG Inventory Protocols The Magnesium Industry Partnership's SF6 emissions tracking and reporting software tool (Excel based) can be accessed by visiting the Partnership's...

  12. Climate VISION: Private Sector Initiatives: Magnesium: GHG Information

    Office of Scientific and Technical Information (OSTI)

    GHG Information The magnesium industry directly emits SF6 from its primary metal production, parts casting, and recycling operations. In 2005, the industry's SF6 emissions were...

  13. Magnesium Front End Research and Development AMD 604

    Broader source: Energy.gov (indexed) [DOE]

    and sheet forming Improved high-volume manufacturing techniques for joining and corrosion protection of magnesium structures. Improved knowledge base in Mg...

  14. Magnesium Front End Research and Development AMD 604

    Broader source: Energy.gov (indexed) [DOE]

    high volume manufacturing techniques for joining of Mg - Large- scale joining and corrosion protection of magnesium structures. * Corrosion: Durability of Mg-intensive...

  15. AMD 601 High Integrity -Magnesium Automotive Components (HI-MAC...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Neutral or Less Than Current Aluminum Components USAMP AMD 601 - High Integrity Magnesium Automotive Components (HI-MAC) edm2@chrysler.com February 28, 2008 Approach Scientific...

  16. az31 wrought magnesium: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    MgOTiB2. Open Access Theses and Dissertations Summary: ??The stoichiometric Self-propagating High-temperature Synthesis (SHS) thermite reaction involving magnesium oxide...

  17. Magnesium behavior and structural defects in Mg+ ion implanted...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    irradiation with magnesium as the major metallic transmutant; the others include aluminum, beryllium and phosphorus in addition to helium and hydrogen gaseous species. The...

  18. Development of High-Volume Warm Forming of Low-Cost Magnesium...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Magnesium Sheet AMD 602 Project Team * OEM's - Chrysler, Ford , GM * Contracts - Troy Tooling Technologies - Materials Suppliers * Magnesium Elektron * POSCO * Thyssen * CSIRO *...

  19. Development of High-Volume Warm Forming of Low-Cost Magnesium...

    Broader source: Energy.gov (indexed) [DOE]

    mccarty13.pdf More Documents & Publications Warm Forming of AluminumAMD 307 Magnesium Front End Research And Development (AMD604) Magnesium Front End Design And Development...

  20. MAGNESIUM ISOTOPE RATIOS IN {omega} CENTAURI RED GIANTS

    SciTech Connect (OSTI)

    Da Costa, G. S.; Norris, John E.; Yong, David [Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 0200 (Australia)

    2013-05-20T23:59:59.000Z

    We have used the high-resolution observations obtained at the Anglo-Australian Telescope with Ultra-High Resolution Facility (R {approx} 100,000) and at Gemini-S with b-HROS (R {approx} 150,000) to determine magnesium isotope ratios for seven {omega} Cen red giants that cover a range in iron abundance from [Fe/H] = -1.78 to -0.78 dex, and for two red giants in M4 (NGC 6121). The {omega} Cen stars sample both the ''primordial'' (i.e., O-rich, Na- and Al-poor) and the ''extreme'' (O-depleted, Na- and Al-rich) populations in the cluster. The primordial population stars in both {omega} Cen and M4 show ({sup 25}Mg, {sup 26}Mg)/{sup 24}Mg isotopic ratios that are consistent with those found for the primordial population in other globular clusters with similar [Fe/H] values. The isotopic ratios for the {omega} Cen extreme stars are also consistent with those for extreme population stars in other clusters. The results for the extreme population stars studied indicate that the {sup 26}Mg/{sup 24}Mg ratio is highest at intermediate metallicities ([Fe/H] < -1.4 dex), and for the highest [Al/Fe] values. Further, the relative abundance of {sup 26}Mg in the extreme population stars is notably higher than that of {sup 25}Mg, in contrast to model predictions. The {sup 25}Mg/{sup 24}Mg isotopic ratio in fact does not show any obvious dependence on either [Fe/H] or [Al/Fe] nor, intriguingly, any obvious difference between the primordial and extreme population stars.

  1. Casting Porosity-Free Grain Refined Magnesium Alloys

    SciTech Connect (OSTI)

    Schwam, David [Case Western Reserve University] [Case Western Reserve University

    2013-08-12T23:59:59.000Z

    The objective of this project was to identify the root causes for micro-porosity in magnesium alloy castings and recommend remedies that can be implemented in production. The findings confirm the key role played by utilizing optimal gating and risering practices in minimizing porosity in magnesium castings.?

  2. SOFC Ohmic Resistance Reduction by HCl-Induced Removal of Manganese...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    SOFC Ohmic Resistance Reduction by HCl-Induced Removal of Manganese at the AnodeElectrolyte Interface. SOFC Ohmic Resistance Reduction by HCl-Induced Removal of Manganese at the...

  3. Promising Magnesium Battery Research at ALS

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's Possible forPortsmouth/Paducah47,193.70 HgPromising Magnesium Battery Research at ALS Promising

  4. Conditions and mechanism for the formation of iron-rich Montmorillonite in deep sea sediments (Costa Rica Margin): Coupling high resolution mineralogical

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    samples and a chemical modeling approach to assess mineralogical reactions and pathways. Transmission code PhreeqC, using mineralogical and pore fluid compositions from sediment samples and calculated. Saponite can be iron- or magnesium-rich and has a trioctahedral structure. Each of these minerals forms

  5. Process for converting magnesium fluoride to calcium fluoride

    DOE Patents [OSTI]

    Kreuzmann, A.B.; Palmer, D.A.

    1984-12-21T23:59:59.000Z

    This invention is a process for the conversion of magnesium fluoride to calcium fluoride whereby magnesium fluoride is decomposed by heating in the presence of calcium carbonate, calcium oxide or calcium hydroxide. Magnesium fluoride is a by-product of the reduction of uranium tetrafluoride to form uranium metal and has no known commercial use, thus its production creates a significant storage problem. The advantage of this invention is that the quality of calcium fluoride produced is sufficient to be used in the industrial manufacture of anhydrous hydrogen fluoride, steel mill flux or ceramic applications.

  6. An EPR study of ¹?O? on magnesium oxide 

    E-Print Network [OSTI]

    Wong, Ning-Bew

    1971-01-01T23:59:59.000Z

    AN EPR STUDY OF 0 ON MAGNESIUM OXIDE A Thesis by NING-SEW WONG Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE May 1971 Major Subject: Chemistry AN EPR... STUDY OF 0 ON MAGNESIUM OXIDE A Thesis by NING-BEN WONG Approved as to style and content by: (Chairman of Committe (Head of Department) (Member) (Member) May 1971 ABSTRACT 17 An EPR Study of 0 on Magnesium Oxide (May, 1971) Ning-Bew Wong, B...

  7. Manganese sulfide formation via concomitant microbial manganese oxide and thiosulfate reduction

    SciTech Connect (OSTI)

    Lee, Ji-Hoon; Kennedy, David W.; Dohnalkova, Alice; Moore, Dean A.; Nachimuthu, Ponnusamy; Reed, Samantha B.; Fredrickson, Jim K.

    2011-12-13T23:59:59.000Z

    The dissimilatory metal-reducing bacterium, Shewanella oneidensis MR-1 produced {gamma}-MnS (rambergite) nanoparticles during the concurrent reduction of MnO{sub 2} and thiosulfate coupled to H{sub 2} oxidation. To investigate effect of direct microbial reduction of MnO{sub 2} on MnS formation, two MR-1 mutants defective in outer membrane c-type cytochromes ({Delta}mtrC/{Delta}omcA and {Delta}mtrC/{Delta}omcA/{Delta}mtrF) were also used and it was determined that direct reduction of MnO{sub 2} was dominant relative to chemical reduction by biogenic sulfide generated from thiosulfate reduction. Although bicarbonate was excluded from the medium, incubations of strain MR-1 with lactate as the electron donor produced MnCO{sub 3} (rhodochrosite) as well as MnS in nearly equivalent amounts as estimated by micro X-ray diffraction (micro-XRD) analysis. It was concluded that carbonate released from lactate metabolism promoted MnCO{sub 3} formation and that Mn(II) mineralogy was strongly affected by carbonate ions even in the presence of abundant sulfide and weakly alkaline conditions expected to favor the precipitation of MnS. Formation of MnS, as determined by a combination of micro-XRD, transmission electron microscopy, energy dispersive X-ray spectroscopy, and selected area electron diffraction analyses was consistent with equilibrium speciation modeling predictions. Biogenic manganese sulfide may be a manganese sink in the Mn biogeochemical cycle in select environments such as deep anoxic marine basins within the Baltic Sea.

  8. Nucleation of the isothermal martensitic transformation in iron-nickel-manganese alloys

    E-Print Network [OSTI]

    Pati, Satya Ranjan

    1967-01-01T23:59:59.000Z

    By means of quantitative metallography and electrical resistance measurements, the incubation period (time to form a detectable amount of martensite) and the initial nucleation rate have been determined as a function of ...

  9. Settling Rates for Flocculation of Iron and Manganese Ore-Containing Suspensions by Cationic Glycogen

    E-Print Network [OSTI]

    North Texas, University of

    --and a valuable one in all nations--reusage of industrial water and municipal sludges can have a power- ful impact the world the application of synthetic flocculants is accepted for solid­liq- uid separation the polymer flocculant [4­6]. Synthetic polyacrylamides are effective flocculants and easily tailored

  10. Reaction of Plutonium(VI) with the Manganese-Substituted Iron Oxide Mineral Goethite

    E-Print Network [OSTI]

    Hu, Yung-Jin Hu

    2011-01-01T23:59:59.000Z

    level. Goethite Synthesis Goethite (table 4.1) wasThe laboratory synthesis of goethite requires relativelyindicating that the goethite synthesis was successful. SEM

  11. Sorption of Ferric Iron from Siderophore Complexes by Layer Type Manganese

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over Our Instagram Secretary Moniz9MorganYouofSolving the Unsovlable:

  12. Manganese-oxidizing photosynthesis before the rise of cyanobacteria

    E-Print Network [OSTI]

    Fischer, Woodward

    Manganese-oxidizing photosynthesis before the rise of cyanobacteria Jena E. Johnsona,1 , Samuel M) The emergence of oxygen-producing (oxygenic) photosynthesis fundamentally transformed our planet; however biological innovation-- the evolution of oxygenic photosynthesis (3, 4). Several bio- chemical attributes

  13. MANGANESE--1997 49.1 By Thomas S. Jones

    E-Print Network [OSTI]

    Torgersen, Christian

    production by virtue of its sulfur-fixing, deoxidizing, and alloying properties. Steelmaking dioxide by synthetic dioxide, principally electrolytic manganese dioxide (EMD). For U.S. foreign trade%. The decrease in year-average price was about 4% for silicomanganese and 18% for medium-carbon ferromanganese

  14. Ames Lab 101: BAM (Boron-Aluminum-Magnesium)

    ScienceCinema (OSTI)

    Bruce Cook

    2013-06-05T23:59:59.000Z

    Materials scientist, Bruce Cook, discusses the super hard, low friction, and lubricious alloy know as BAM (Boron-Aluminum-Magnesium). BAM was discovered by Bruce Cook and his team a

  15. az91 magnesium alloy: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Page Last Page Topic Index 1 Studies on the inuence of chloride ion and pH on the corrosion and electrochemical behaviour of AZ91D magnesium alloy Engineering Websites Summary:...

  16. Magnesium Replacement of Aluminum Cast Components in a Production...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Replacement of Aluminum Cast Components in a Production V6 Engine to Effect Cost-Effective Mass Reduction Magnesium Replacement of Aluminum Cast Components in a Production V6...

  17. The continental margin is a key source of iron to the HNLC North Pacific Ocean

    SciTech Connect (OSTI)

    Lam, P.J.; Bishop, J.K.B

    2008-01-15T23:59:59.000Z

    Here we show that labile particulate iron and manganese concentrations in the upper 500m of the Western Subarctic Pacific, an iron-limited High Nutrient Low Chlorophyll (HNLC) region, have prominent subsurface maxima between 100-200 m, reaching 3 nM and 600 pM, respectively. The subsurface concentration maxima in particulate Fe are characterized by a more reduced oxidation state, suggesting a source from primary volcagenic minerals such as from the Kuril/Kamchatka margin. The systematics of these profiles suggest a consistently strong lateral advection of labile Mn and Fe from redox-mobilized labile sources at the continental shelf supplemented by a more variable source of Fe from the upper continental slope. This subsurface supply of iron from the continental margin is shallow enough to be accessible to the surface through winter upwelling and vertical mixing, and is likely a key source of bioavailable Fe to the HNLC North Pacific.

  18. Hot coal gas desulfurization with manganese-based sorbents

    SciTech Connect (OSTI)

    Hepworth, M.T.; Ben-Slimane, R.

    1995-11-01T23:59:59.000Z

    The primary major deposit of manganese in the US which can be readily mined by an in situ process is located in the Emily district of Minnesota. The US Bureau of Mines Research Centers at both the Twin Cities and Salt Lake City have developed a process for extracting and refining manganese in the form of a high-purity carbonate product. This product has been formulated into pellets by a multi-step process of drying, calcination, and induration to produce relatively high-strength formulations which are capable of being used for hot fuel gas desulfurization. These pellets, which have been developed at the University of Minnesota under joint sponsorship of the US Department of Energy and the US Bureau of Mines, appear superior to other, more expensive, formulations of zinc titanate and zinc ferrite which have previously been studied for multi-cycle loading (desulfurization) and regeneration (evolution of high-strength SO{sub 2} and restoration of pellet reactivity). Although these other formulations have been under development for the past twelve years, their prices still exceed $7 per pound. If manganese pellets perform as predicted in fixed bed testing, and if a significant number of utilities which burn high-sulfur coals incorporate combined-cycle gasification with hot coal gas desulfurization as a viable means of increasing conversion efficiencies, then the potential market for manganese pellets may be as high as 200,000 tons per year at a price not less than $3 per pound. This paper discusses the role of manganese pellets in the desulfurization process with respect to the integrated gasification combined-cycle (IGCC) for power generation.

  19. An investigation of magnesium production in silicon by neutron transmutation

    E-Print Network [OSTI]

    Davis, Freddie Joe

    1986-01-01T23:59:59.000Z

    OF SCIENCE May 1986 Major Subject: Nuclear Engineering AN INVESTIGATION OF MAGNESIUM PRODUCTION IN SILICON BY NEUTRON TRANSMUTATION A Thesis by FREDDIE JOE DAVIS, JR. Approved as to style and content by: Ron R. Har t (Chair of Committee) Donald L... University Chairman of Advisory Committee: Dr . Ron R. Hart An investigation of the production of' magnesium in silicon by neutron tr ansmutation is r eported. A 20 mil silicon wafer was irradiated at the Texas A&M University Nuclear Science Center...

  20. Determination of carbon, nitrogen, and oxygen in high purity magnesium 

    E-Print Network [OSTI]

    Roche, Neil Gerard

    1981-01-01T23:59:59.000Z

    DETERMINATION OF CARBON, NITROGEN, AND OXYGEN IN HIGH PURITY MAGNESIUM A Thesis by NEIL GERARD ROCHE Submitted to the Graduate College of Texas A8cM University in partial i'ulfillment of the requirement for the degree of MASTER OF SCIENCE... December 1981 Major Subject: Chemistry DETERMINATION OF CARBON, NITROGEN, AND OXYGEN IN HIGH PURITY MAGNESIUM A Thesis by NEIL GERARD ROCHE Approved as to style and content by: E. A. Schweikert (Chairman of Committee) G. J. Bastiaans (Member) L...

  1. Grow Iron, Slow Pollution | EMSL

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Grow Iron, Slow Pollution Grow Iron, Slow Pollution Scientists connect previous studies on electron transport in hematite Making a Deposit: Scanning electron micrographs of...

  2. (Data in thousand metric tons gross weight unless otherwise specified) Domestic Production and Use: Manganese ore containing 35% or more manganese has not been produced

    E-Print Network [OSTI]

    Torgersen, Christian

    purposes as production of dry cell batteries, in plant fertilizers and animal feed, and as a brick colorant of apparent consumption 100 100 100 100 100 Recycling: Manganese was recycled incidentally as a minor inventory for disposal FY 2009 FY 2009 Manganese ore: Battery grade -- -- 18 -- Chemical grade -- -- 23

  3. Verification of Steelmaking Slags Iron Content Final Technical Progress Report

    SciTech Connect (OSTI)

    J.Y. Hwang

    2006-10-04T23:59:59.000Z

    The steel industry in the United States generates about 30 million tons of by-products each year, including 6 million tons of desulfurization and BOF/BOP slag. The recycling of BF (blast furnace) slag has made significant progress in past years with much of the material being utilized as construction aggregate and in cementitious applications. However, the recycling of desulfurization and BOF/BOP slags still faces many technical, economic, and environmental challenges. Previous efforts have focused on in-plant recycling of the by-products, achieving only limited success. As a result, large amounts of by-products of various qualities have been stockpiled at steel mills or disposed into landfills. After more than 50 years of stockpiling and landfilling, available mill site space has diminished and environmental constraints have increased. The prospect of conventionally landfilling of the material is a high cost option, a waste of true national resources, and an eternal material liability issue. The research effort has demonstrated that major inroads have been made in establishing the viability of recycling and reuse of the steelmaking slags. The research identified key components in the slags, developed technologies to separate the iron units and produce marketable products from the separation processes. Three products are generated from the technology developed in this research, including a high grade iron product containing about 90%Fe, a medium grade iron product containing about 60% Fe, and a low grade iron product containing less than 10% Fe. The high grade iron product contains primarily metallic iron and can be marketed as a replacement of pig iron or DRI (Direct Reduced Iron) for steel mills. The medium grade iron product contains both iron oxide and metallic iron and can be utilized as a substitute for the iron ore in the blast furnace. The low grade iron product is rich in calcium, magnesium and iron oxides and silicates. It has a sufficient lime value and can be utilized for acid mine drainage treatment. Economic analysis from this research demonstrates that the results are favorable. The strong demand and the increase of price of the DRI and pig iron in recent years are particularly beneficial to the economics. The favorable economics has brought commercial interests. ICAN Global has obtained license agreement on the technology from Michigan Tech. This right was later transferred to the Westwood Land, Inc. A demonstration pilot plant is under construction to evaluate the technology. Steel industry will benefit from the new supply of the iron units once the commercial plants are constructed. Environmental benefits to the public and the steel industry will be tremendous. Not only the old piles of the slag will be removed, but also the federal responsible abandoned mines from the old mining activities can be remediated with the favorable product generated from the process. Cost can be reduced and there will be no lime required, which can avoid the release of carbon dioxide from lime production process.

  4. Growth of epitaxial iron nitride ultrathin film on zinc-blende gallium nitride

    SciTech Connect (OSTI)

    Pak, J.; Lin, W.; Wang, K.; Chinchore, A.; Shi, M.; Ingram, D. C.; Smith, A. R.; Sun, K.; Lucy, J. M.; Hauser, A. J.; Yang, F. Y. [Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701 (United States); Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States); Department of Physics, The Ohio State University, 191 Woodruff Avenue, Columbus, Ohio 43210 (United States)

    2010-07-15T23:59:59.000Z

    The authors report the growth of iron nitride on zinc-blende gallium nitride using molecular beam epitaxy. First, zinc-blende GaN is grown on a magnesium oxide substrate having (001) orientation; second, an ultrathin layer of FeN is grown on top of the GaN layer. In situ reflection high-energy electron diffraction is used to monitor the surface during growth, and a well-defined epitaxial relationship is observed. Cross-sectional transmission electron microscopy is used to reveal the epitaxial continuity at the gallium nitride-iron nitride interface. Surface morphology of the iron nitride, similar to yet different from that of the GaN substrate, can be described as plateau valley. The FeN chemical stoichiometry is probed using both bulk and surface sensitive methods, and the magnetic properties of the sample are revealed.

  5. Nondestructive evaluation of an environmentally friendly conversion coating for magnesium alloys using optical measurement techniques

    E-Print Network [OSTI]

    Zuniga, David

    2006-10-30T23:59:59.000Z

    Magnesium alloys have one of the highest specific strengths of all construction metals used. Specifically, magnesium alloy castings are used in the aerospace industry to reduce the weight of aerospace vehicles. Coating systems must be employed...

  6. Nondestructive evaluation of an environmentally friendly conversion coating for magnesium alloys using optical measurement techniques 

    E-Print Network [OSTI]

    Zuniga, David

    2006-10-30T23:59:59.000Z

    Magnesium alloys have one of the highest specific strengths of all construction metals used. Specifically, magnesium alloy castings are used in the aerospace industry to reduce the weight of aerospace vehicles. Coating systems must be employed...

  7. Development of High-Volume Warm Forming of Low-Cost Magnesium...

    Broader source: Energy.gov (indexed) [DOE]

    Yingbing Luo, George Luckey * GM - Paul Krajewski, Ravi Verma Contracts * Troy Tooling Technologies - Dennis Cedar * Materials Suppliers - Magnesium Elektron - POSCO -...

  8. Blood pressure and red blood cell magnesium, potassium, and calcium responses to dietary fats

    E-Print Network [OSTI]

    Wehrman, Noreen Elaine

    1993-01-01T23:59:59.000Z

    of hypertension. The role of dietary fats in blood pressure regulation is being studied more closely, with careful consideration to their actions on prostaglandin synthesis, membrane fluidity and permeability, and electrolyte balance. This study examined... Page 111 . V1 V11 . 1X Problem Identification. Electrolytes. Magnesium . The Role of Magnesium and Ion Transport . The Relationship Between Magnesium and Potassium. The Relationship Between Magnesium and Calcium. The Relationship Between...

  9. Nanostructured material for advanced energy storage : magnesium battery cathode development.

    SciTech Connect (OSTI)

    Sigmund, Wolfgang M. (University of Florida, Gainesville, FL); Woan, Karran V. (University of Florida, Gainesville, FL); Bell, Nelson Simmons

    2010-11-01T23:59:59.000Z

    Magnesium batteries are alternatives to the use of lithium ion and nickel metal hydride secondary batteries due to magnesium's abundance, safety of operation, and lower toxicity of disposal. The divalency of the magnesium ion and its chemistry poses some difficulties for its general and industrial use. This work developed a continuous and fibrous nanoscale network of the cathode material through the use of electrospinning with the goal of enhancing performance and reactivity of the battery. The system was characterized and preliminary tests were performed on the constructed battery cells. We were successful in building and testing a series of electrochemical systems that demonstrated good cyclability maintaining 60-70% of discharge capacity after more than 50 charge-discharge cycles.

  10. Effects of dietary potassium and sodium on magnesium and potassium balance in lambs

    E-Print Network [OSTI]

    Poe, Julie Hamilton

    1984-01-01T23:59:59.000Z

    . Molasses in a 1:1 mixture with magnesium oxide (Horvath et al. , 1967) or magnesium acetate (Ross and Gibson, 1969) has prevented low serum Mg levels. Magnesium alloy bullets have been designed to lodge in the reticulo-rumen and slowly release Mg...

  11. PITTING CORROSION ON MAGNESIUM ALLOYS : A COMPARATIVE STUDY OF FIELD DATA USING EXTREME VALUE

    E-Print Network [OSTI]

    Maume-Deschamps, Véronique

    PITTING CORROSION ON MAGNESIUM ALLOYS : A COMPARATIVE STUDY OF FIELD DATA USING EXTREME VALUE corrosion of the magnesium alloys AZ91D and AM60B combined with different coatings on steel bolts was investigated in field corrosion tests carried out by Volvo Car Corporation. Light metals like magnesium

  12. X-ray Absorption Spectroscopy of Transition Metal-Magnesium Hydride Thin Films

    E-Print Network [OSTI]

    X-ray Absorption Spectroscopy of Transition Metal-Magnesium Hydride Thin Films T. J. Richardsona@lbl.gov Abstract Mixed metal thin films containing magnesium and a first-row transition element exhibit very large of magnesium hydride. Keywords: A. hydrogen storage materials, thin films; C. EXAFS, NEXAFS, X-ray diffraction

  13. Evaluation of microstructural eects on corrosion behaviour of AZ91D magnesium

    E-Print Network [OSTI]

    Zhou, Wei

    . Magnesium and its alloys, with one quarter of the density of steel and only two thirds that of aluminium of the prerequisites for all these applications. The corrosion behaviour of cast magnesium±aluminium alloys couldEvaluation of microstructural eects on corrosion behaviour of AZ91D magnesium alloy Rajan Ambat

  14. New nanocrystalline manganese oxides as cathode materials for lithium batteries : electron microscopy, electrochemical and X-ray absorption studies

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 New nanocrystalline manganese oxides as cathode materials for lithium batteries : electron: manganese oxide, lithium batteries, nanomaterials Corresponding author: Pierre Strobel, tel. 33 476 887 940 with lithium iodide in aqueous medium at room temperature. Transmission electron microscopy (TEM) showed

  15. Periadolescent oral manganese exposure affects conditioned place preference by cocaine and conditioned place aversion by lithium chloride in rats

    E-Print Network [OSTI]

    Lee, Samuel Ming Hin

    2013-02-22T23:59:59.000Z

    Manganese neurotoxicity compromises basal ganglia functions that could affect the limbic system and drug sensitivity. Male rats were orally exposed to manganese chloride (0, 100, 200 mg/kg/day Mn) for 15 days starting at postnatal day (PND) 28...

  16. Determination of carbon, nitrogen, and oxygen in high purity magnesium

    E-Print Network [OSTI]

    Roche, Neil Gerard

    1981-01-01T23:59:59.000Z

    the determination of low Z impurities (carbon, nitrogen, and oxygen) is a prerequisite for gaining an understanding of the effects of chemical imperfections on the physical, metallurgical, and chemical properties of magnesium (2). The purpose of this study... of nitrogen was accomplished with a 7. 8 MeV Be beam and 9 3 some modifications of the preceeding He procedure were necessary due to the nature of the ion beam. Sam les and Standards Eleven magnesium ingots were received from Dow Chemical Co. , Texas...

  17. The magnesium nutrition of cotton as influenced by sodium 

    E-Print Network [OSTI]

    Thenabadu, Mervyn Wellesly

    1964-01-01T23:59:59.000Z

    1964 Major Subject. Plant Physic logy THE MAGNESIUM NUTRITION OF COTTON AS INFLUENCED BY SODIUM A Thesis By MERVYN M. THENABADU Approved as to style and content by: Chairman of Commi. e Nun Head of Department Member Mem, er Member Member... REVIEW OF LITERATURE (a) Sodium as a plant nutrient (b) I'he role of magnesium in plant nutrition MATERIALS AND METHODS RESUL:S DISCUSSION 13 21 24 (a) The effect of treatments on grcwth and reproduction (b) The effect of treatments on the ccr...

  18. MediumAlloy ManganeseRich TransformationInduced Plasticity Steels

    E-Print Network [OSTI]

    Cambridge, University of

    for strong and ductile alloys containing some 6 wt% of manganese, but with aluminium additions in orderMedium­Alloy Manganese­Rich Transformation­Induced Plasticity Steels D. W. Suha , J. H. Ryua , M. S to permit heat treatments which are amenable to rapid production. However, large concentrations of aluminium

  19. A Life Cycle Assessment of a Magnesium Automotive Front End

    SciTech Connect (OSTI)

    Das, Sujit [ORNL; Dubreuil, Alain [Natural Resources Canada; Bushi, Lindita [GreenhouseGasMeasurement.com; Tharumarajah, Ambalavanar [CSIRO/CAST-CRC

    2009-01-01T23:59:59.000Z

    The Magnesium Front End Research and Development (MFERD) project under the sponsorship of Canada, China and USA aims to develop key technologies and a knowledge base for increased use of magnesium in automobile. The goal of this life cycle assessment (LCA) study is to compare the energy and potential environmental impacts of advanced magnesium based front end parts of a North America built 2007 GM-Cadillac CTS with the standard carbon steel based design. This LCA uses the 'cradle-to-grave' approach by including primary material production, semi-fabrication production, autoparts manufacturing and assembly, transportation, use phase and end-of-life processing of autoparts. This LCA study was done in compliance with international standards ISO 14040:2006 and ISO 14044:2006. Furthermore, the LCA results for aluminum based front end autopart are presented. While weight savings result in reductions in energy use and carbon dioxide emissions during the use of the car, the impacts of fabrication and recycling of lightweight materials are substantial in regard to steel. Pathways for improving sustainability of magnesium use in automobiles through material management and technology improvements including recycling are also discussed.

  20. The magnesium nutrition of American upland and Egyptian cottons

    E-Print Network [OSTI]

    Helmy, Hussein

    1956-01-01T23:59:59.000Z

    of phosphate, it is believed to be involved 1n phospholipM formation and in the synthesis of nucleo-proteins 1n plant cells accord- ing to Trucg gt al . (56). Bear et sic (4) found that oily seeds are especially h1gh in magnesium indicating some close...

  1. The Microstructure of Mechanically Alloyed Nanocrystalline Aluminium-Magnesium

    E-Print Network [OSTI]

    Gubicza, Jenõ

    The Microstructure of Mechanically Alloyed Nanocrystalline Aluminium-Magnesium Jen Gubicza1, mechanical alloying, nanocrystalline Al-Mg alloys Abstract. The effect of the nominal Mg content and the milling time on the microstructure of mechanically alloyed Al(Mg) solid solutions is studied

  2. Solid electrolyte based sensor for monitoring the magnesium level during reclamation of aluminum scrap

    SciTech Connect (OSTI)

    Fergus, J.W.; Hui, S. [Auburn Univ., AL (United States). Materials Research and Education Center

    1996-10-01T23:59:59.000Z

    Aluminum alloy scrap often contains excess magnesium which must be removed during recycling by a process referred to as demagging. The efficiency of this process could be improved with an in-situ magnesium sensor, which could be used to optimize the process parameters to the changing magnesium content. The sensor developed in this work consists of a galvanic cell with a magnesium fluoride (MgF{sub 2}) solid electrolyte and a molten magnesium reference electrode. The voltage output of the sensor changes by about 100 mV for the change in magnesium content which occurs during the demagging process (5 wt% to 0.1 wt%) and is in excellent agreement with thermodynamic measurements using molten chloride electrolytes. This paper focuses on the effect of silicon, which is a common alloying element in aluminum alloys, on the output of an electrochemical magnesium sensor.

  3. Evidence That the [beta] Subunit of Chlamydia trachomatis Ribonucleotide Reductase Is Active with the Manganese Ion of Its Manganese(IV)/Iron(III) Cofactor in Site 1

    SciTech Connect (OSTI)

    Dassama, Laura M.K.; Boal, Amie K.; Krebs, Carsten; Rosenzweig, Amy C.; Bollinger, Jr., J. Martin (NWU); (Penn)

    2014-10-02T23:59:59.000Z

    The reaction of a class I ribonucleotide reductase (RNR) begins when a cofactor in the {beta} subunit oxidizes a cysteine residue {approx}35 {angstrom} away in the {alpha} subunit, generating a thiyl radical. In the class Ic enzyme from Chlamydia trachomatis (Ct), the cysteine oxidant is the Mn{sup IV} ion of a Mn{sup IV}/Fe{sup III} cluster, which assembles in a reaction between O{sub 2} and the Mn{sup II}/Fe{sup II} complex of {beta}. The heterodinuclear nature of the cofactor raises the question of which site, 1 or 2, contains the Mn{sup IV} ion. Because site 1 is closer to the conserved location of the cysteine-oxidizing tyrosyl radical of class Ia and Ib RNRs, we suggested that the Mn{sup IV} ion most likely resides in this site (i.e., {sup 1}Mn{sup IV}/{sup 2}Fe{sup III}), but a subsequent computational study favored its occupation of site 2 ({sup 1}Fe{sup III}/{sup 2}Mn{sup IV}). In this work, we have sought to resolve the location of the Mn{sup IV} ion in Ct RNR-{beta} by correlating X-ray crystallographic anomalous scattering intensities with catalytic activity for samples of the protein reconstituted in vitro by two different procedures. In samples containing primarily Mn{sup IV}/Fe{sup III} clusters, Mn preferentially occupies site 1, but some anomalous scattering from site 2 is observed, implying that both {sup 1}Mn{sup II}/{sup 2}Fe{sup II} and {sup 1}Fe{sup II}/{sup 2}Mn{sup II} complexes are competent to react with O{sub 2} to produce the corresponding oxidized states. However, with diminished Mn{sup II} loading in the reconstitution, there is no evidence for Mn occupancy of site 2, and the greater activity of these 'low-Mn' samples on a per-Mn basis implies that the {sup 1}Mn{sup IV}/{sup 2}Fe{sup III}-{beta} is at least the more active of the two oxidized forms and may be the only active form.

  4. GEOC Andrew Stack Thursday, March 20, 2014 152 Kinetics of arsenic oxidation by manganese oxide minerals: The influence of origin and structure on reactivity

    E-Print Network [OSTI]

    Sparks, Donald L.

    minerals: The influence of origin and structure on reactivity Jason S. Fischel1, fischelj@udel.edu, Matthew. Their highly reactive surfaces allow manganese minerals to oxidize trace metals such as arsenic from the mobile of manganese minerals found in natural systems. Five Manganese oxide minerals manganese oxide (HMO), hexagonal

  5. Creating an iron understudy | EMSL

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    iron reactivity. To test their process, the team created tiny iron oxide spheres with titanium added to control the Fe(II)Fe(III) ratio directly. The designer particles are also...

  6. The effect of a prolonged magnesium restriction on the humoral immune response in maternal rats and their offspring 

    E-Print Network [OSTI]

    Cohill, Diane T

    1987-01-01T23:59:59.000Z

    and to observe alteration in these effects resulting from magnesium supplementation during gestation and lactation. Female weanling Sprague-Dawley rats were provided diets containing adequate (1200 mg Mg/kg diet) or inadequate (200 mg Mg/kg diet) magnesium...), was lower in the magnesium-restricted dams, In the group which had been magnesium restricted during growth but then received supplemental magnesium during gestation and lactation, dams had an improved immune r esponse; but pups did not lt was conc...

  7. Mixed polyanion glass cathodes: Iron phosphate vanadate glasses

    SciTech Connect (OSTI)

    Kercher, Andrew K [ORNL; Ramey, Joanne Oxendine [ORNL; Carroll, Kyler J [Massachusetts Institute of Technology (MIT); Kiggans Jr, James O [ORNL; Veith, Gabriel M [ORNL; Meisner, Roberta [Oak Ridge National Laboratory (ORNL); Boatner, Lynn A [ORNL; Dudney, Nancy J [ORNL

    2014-01-01T23:59:59.000Z

    Mixed polyanion (MP) glasses have been investigated for use as cathodes in lithium ion batteries. MP glass cathodes are similar in composition to theoretically promising crystalline polyanionic (CP) cathodes (e.g., lithium cobalt phosphate, lithium manganese silicate), but with proper polyanion substitution, they can be designed to overcome the key shortcomings of CP cathodes, such as poor electrical conductivity and irreversible phase changes. Iron phosphate/vanadate glasses were chosen as a first demonstration of the MP glass concept. Polyanion substitution with vanadate was shown to improve the intercalation capacity of an iron phosphate glass from almost zero to full theoretical capacity. In addition, the MP glass cathodes also exhibited an unexpected second high-capacity electrochemical reaction. X-ray absorption near-edge structure (XANES) and x-ray diffraction (XRD) of cathodes from cells having different states of charge suggested that this second electrochemical reaction is a glass-state conversion reaction. With a first demonstration established, MP glass materials utilizing an intercalation and/or glass-state conversion reaction are promising candidates for future high-energy cathode research.

  8. A study of the chemical forms of manganese in sea water

    E-Print Network [OSTI]

    Buglio, Benjamin

    1961-01-01T23:59:59.000Z

    Sampling Equipment Methods Cleaning Procedure Total Manganese Determination. . . . . . . . . Calculations Separation of Mn+2 from other Forms of Manganese. . Removal of MnOs from Solution 7 7 7 7 7 0 e 9 9 9 9 9 9 13 15 17 CHAPTER II... Results and Discussion Study of Mn+2 in sea water. Study of MnOs in sea water Exchange between Mn+2 and Laboratory Prepared MnOs Exchange between Mn and the MnOs of sea water Study of Organically Bound Manganese in Sea Water . ~ ~ ~ Exchange of Mn...

  9. Switchable mirrors based on nickel-magnesium films

    SciTech Connect (OSTI)

    Richardson,Thomas J.; Slack, Jonathan L.; Armitage, Robert D.; Kostecki, Robert; Farangis, Baker; Rubin, Michael D.

    2001-01-16T23:59:59.000Z

    A new type of electrochromic mirror electrode based on reversible uptake of hydrogen in nickel magnesium alloy films is reported. Thin,magnesium-rich Ni-Mg films prepared on glass substrates by cosputtering from Ni and Mg targets are mirror-like in appearance and have low visible transmittance. Upon exposure to hydrogen gas or on reduction in alkaline electrolyte, the films take up hydrogen and become transparent. When hydrogen is removed, the mirror properties are recovered. The transition is believed to result from reversible formation of Mg2NiH4 and MgH2. A thin overlayer of palladium was found to enhance the kinetics of hydrogen insertion and extraction,and to protect the metal surface against oxidation.

  10. Manganese Porphyrins Catalyze Selective C-H Bond Halogenations

    SciTech Connect (OSTI)

    Liu, Wei; Groves, John T

    2010-01-01T23:59:59.000Z

    We report a manganese porphyrin mediated aliphatic C?H bond chlorination using sodium hypochlorite as the chlorine source. In the presence of catalytic amounts of phase transfer catalyst and manganese porphyrin Mn(TPP)Cl 1, reaction of sodium hypochlorite with different unactivated alkanes afforded alkyl chlorides as the major products with only trace amounts of oxygenation products. Substrates with strong C?H bonds, such as neopentane (BDE =?100 kcal/mol) can be also chlorinated with moderate yield. Chlorination of a diagnostic substrate, norcarane, afforded rearranged products indicating a long-lived carbon radical intermediate. Moreover, regioselective chlorination was achieved by using a hindered catalyst, Mn(TMP)Cl, 2. Chlorination of trans-decalin with 2 provided 95% selectivity for methylene-chlorinated products as well as a preference for the C2 position. This novel chlorination system was also applied to complex substrates. With 5?-cholestane as the substrate, we observed chlorination only at the C2 and C3 positions in a net 55% yield, corresponding to the least sterically hindered methylene positions in the A-ring. Similarly, chlorination of sclareolide afforded the equatorial C2 chloride in a 42% isolated yield. Regarding the mechanism, reaction of sodium hypochlorite with the Mn{sup III} porphyrin is expected to afford a reactive Mn{sup V}?O complex that abstracts a hydrogen atom from the substrate, resulting in a free alkyl radical and a Mn{sup IV}—OH complex. We suggest that this carbon radical then reacts with a Mn{sup IV}—OCl species, providing the alkyl chloride and regenerating the reactive Mn{sup V}?O complex. The regioselectivity and the preference for CH{sub 2} groups can be attributed to nonbonded interactions between the alkyl groups on the substrates and the aryl groups of the manganese porphyrin. The results are indicative of a bent [Mn{sup v}?O---H---C] geometry due to the C—H approach to the Mn{sup v}?O (d??p?)* frontier orbital.

  11. Efficient One-Step Electrolytic Recycling of Low-Grade and Post-Consumer Magnesium Scrap

    SciTech Connect (OSTI)

    Adam C. Powell, IV

    2012-07-19T23:59:59.000Z

    Metal Oxygen Separation Technologies, Inc. (abbreviated MOxST, pronounced most) and Boston University (BU) have developed a new low-cost process for recycling post-consumer co-mingled and heavily-oxidized magnesium scrap, and discovered a new chemical mechanism for magnesium separations in the process. The new process, designated MagReGenTM, is very effective in laboratory experiments, and on scale-up promises to be the lowest-cost lowest-energy lowest-impact method for separating magnesium metal from aluminum while recovering oxidized magnesium. MagReGenTM uses as little as one-eighth as much energy as today's methods for recycling magnesium metal from comingled scrap. As such, this technology could play a vital role in recycling automotive non-ferrous metals, particularly as motor vehicle magnesium/aluminum ratios increase in order to reduce vehicle weight and increase efficiency.

  12. Iron pages of HTSC

    SciTech Connect (OSTI)

    Gasparov, V. A., E-mail: vgasparo@issp.ac.r [Russian Academy of Sciences, Institute of Solid State Physics (Russian Federation)

    2010-08-15T23:59:59.000Z

    Experimental data are presented on the superconducting and electronic properties of iron-based high-temperature superconductors in the normal and superconducting states. The following topics are discussed: lattice structure; structure of magnetic vortices; magnetic penetration depth; Fermi surface; isotope effect; and critical magnetic fields both in oxide compounds of 1111 type and oxide-free compounds of 122, 111, and 011 types as a function of the doping level, temperature, and external pressure.

  13. New Environmentally Friendly Dispersants for High Temperature Invert-Emulsion Drilling Fluids Weighted by Manganese Tetraoxide

    E-Print Network [OSTI]

    Rehman, Abdul

    2012-02-14T23:59:59.000Z

    This thesis provides a detailed evaluation of different environmentally friendly dispersants in invert-emulsion drilling fluids that can be used to drill wells under difficult conditions such as HPHT. The drilling fluid is weighted by manganese...

  14. Process for the electrodeposition of low stress nickel-manganese alloys

    DOE Patents [OSTI]

    Kelly, James John; Goods, Steven Howard; Yang, Nancy Yuan-Chi; Cadden, Charles Henry

    2005-06-07T23:59:59.000Z

    A process for electrodepositing a low stress nickel-manganese multilayer alloy on an electrically conductive substrate is provided. The process includes the steps of immersing the substrate in an electrodeposition solution containing a nickel salt and a manganese salt and repeatedly passing an electric current through an immersed surface of the substrate. The electric current is alternately pulsed for predetermined durations between a first electrical current that is effective to electrodeposit nickel and a second electrical current that is effective to electrodeposit nickel and manganese. A multilayered alloy having adjacent layers of nickel and a nickel-manganese alloy on the immersed surface of the substrate is thereby produced. The resulting multilayered alloy exhibits low internal stress, high strength and ductility, and high strength retention upon exposure to heat.

  15. Ab initio molecular dynamics study of manganese porphine hydration and interaction with nitric oxide

    E-Print Network [OSTI]

    Kevin Leung; Craig J. Medforth

    2007-01-23T23:59:59.000Z

    The authors use ab initio molecular dynamics and the density functional theory+U (DFT+U) method to compute the hydration environment of the manganese ion in manganese (II) and manganese (III) porphines (MnP) dispersed in liquid water. These are intended as simple models for more complex water soluble porphyrins, which have important physiological and electrochemical applications. The manganese ion in Mn(II)P exhibits significant out-of-porphine plane displacement and binds strongly to a single H2O molecule in liquid water. The Mn in Mn(III)P is on average coplanar with the porphine plane and forms a stable complex with two H2O molecules. The residence times of these water molecules exceed 15 ps. The DFT+U method correctly predicts that water displaces NO from Mn(III)P-NO, but yields an ambiguous spin state for the MnP(II)-NO complex.

  16. Commercialization of cryptomelane-type manganese oxide (OMS-2) nanowire paper oil sorbent

    E-Print Network [OSTI]

    Soo, Haw Yun

    2007-01-01T23:59:59.000Z

    Cryptomelane-type Manganese oxide (OMS-2, a group of Octahedral Molecular Sieves) nanowire paper exhibits interesting properties: reversible wettability, oleophilic while being hydrophobic, and high thermal stability. These ...

  17. Molecular Interactions of Plutonium(VI) with Synthetic Manganese-Substituted Goethite

    E-Print Network [OSTI]

    Hu, Yung-Jin

    2011-01-01T23:59:59.000Z

    Mn-Substituted Goethite Synthesis Manganese substituted (Mn-The laboratory synthesis of Mn-substituted goethite requiresgoethite existed as Mn(III), even though Mn was added during mineral synthesis

  18. MANGANESE ABUNDANCES IN THE GLOBULAR CLUSTER {omega} CENTAURI

    SciTech Connect (OSTI)

    Cunha, Katia; Smith, Verne V. [National Optical Astronomy Observatory, 950 N. Cherry Avenue, Tucson, AZ, 85719 (United States); Bergemann, Maria [Max-Planck Institute for Astrophysics, Karl-Schwarzschild Str. 1, 85741 Garching (Germany); Suntzeff, Nicholas B. [Department of Physics and Astronomy and Mitchell Institute for Fundamental Physics and Astronomy, Texas A and M University, College Station, TX 77843-4242 (United States); Lambert, David L. [University of Texas, 1 University Station, C1400, Austin, TX 78712 (United States)

    2010-07-01T23:59:59.000Z

    We present manganese abundances in 10 red giant members of the globular cluster {omega} Centauri; eight stars are from the most metal-poor population (RGB MP and RGB MInt1) while two targets are members of the more metal-rich groups (RGB MInt2 and MInt3). This is the first time Mn abundances have been studied in this peculiar stellar system. The LTE values of [Mn/Fe] in {omega} Cen overlap those of Milky Way stars in the metal-poor {omega} Cen populations ([Fe/H] {approx}-1.5 to -1.8), however unlike what is observed in Milky Way halo and disk stars, [Mn/Fe] declines in the two more metal-rich RGB MInt2 and MInt3 targets. Non-LTE calculations were carried out in order to derive corrections to the LTE Mn abundances. The non-LTE results for {omega} Cen in comparison with the non-LTE [Mn/Fe] versus [Fe/H] trend obtained for the Milky Way confirm and strengthen the conclusion that the manganese behavior in {omega} Cen is distinct. These results suggest that low-metallicity supernovae (with metallicities {<=} -2) of either Type II or Type Ia dominated the enrichment of the more metal-rich stars in {omega} Cen. The dominance of low-metallicity stars in the chemical evolution of {omega} Cen has been noted previously in the s-process elements where enrichment from metal-poor asymptotic giant branch stars is indicated. In addition, copper, which also has metallicity-dependent yields, exhibits lower values of [Cu/Fe] in the RGB MInt2 and MInt3 {omega} Cen populations.

  19. An examination of the relationship between calcium and magnesium and hypertension

    E-Print Network [OSTI]

    Georghiades, Mary Elizabeth

    1988-01-01T23:59:59.000Z

    !ae thr ee blood parameter s best corre)ated with the dietary intake of calcium and magnesium. No i gni f i cant cor r el at i ons (p (0. 05) were ob . , envs d between the calcium, magnesium, or ca)cium/magnesium ratio of the diet and blood tissues... in alterations in the calcium/magnesium ratio. This topic merits Further investigation. ACKNOWLEDGMENTS The author wishes to express her appreciation to Dr. Karen S. Kubena, her advisory committee chairman. For- pr oper guidance, constructive criticism...

  20. Magnesium and pyridoxine intake and mineral content of selected tissues and physical development in rats 

    E-Print Network [OSTI]

    Edgar, Susan Elaine

    1986-01-01T23:59:59.000Z

    lower f eed intake s than did rats from other dietary treatments. During lactation, dai ly feed consumpt ion was lower in an ima1 s depr ived of magnesium. Approximately 24 hr postpartum, in dams who consumed a magnesium-deficient diet, the heart... and kidney contained significantly more calcium, 150'% and 300% respectively. During lactation, mild magnesium restriction resulted in increased weight loss by dams and decreased weight gain by pupa. In the of f spring of rats dep1 et ed o f magnesium...

  1. Microbial reduction of iron ore

    DOE Patents [OSTI]

    Hoffmann, Michael R. (Pasadena, CA); Arnold, Robert G. (Pasadena, CA); Stephanopoulos, Gregory (Pasadena, CA)

    1989-01-01T23:59:59.000Z

    A process is provided for reducing iron ore by treatment with microorganisms which comprises forming an aqueous mixture of iron ore, microorganisms operable for reducing the ferric iron of the iron ore to ferrous iron, and a substrate operable as an energy source for the microbial reduction; and maintaining the aqueous mixture for a period of time and under conditions operable to effect the reduction of the ore. Preferably the microorganism is Pseudomonas sp. 200 and the reduction conducted anaerobically with a domestic wastewater as the substrate. An aqueous solution containing soluble ferrous iron can be separated from the reacted mixture, treated with a base to precipitate ferrous hydroxide which can then be recovered as a concentrated slurry.

  2. Microbial reduction of iron ore

    DOE Patents [OSTI]

    Hoffmann, M.R.; Arnold, R.G.; Stephanopoulos, G.

    1989-11-14T23:59:59.000Z

    A process is provided for reducing iron ore by treatment with microorganisms which comprises forming an aqueous mixture of iron ore, microorganisms operable for reducing the ferric iron of the iron ore to ferrous iron, and a substrate operable as an energy source for the microbial reduction; and maintaining the aqueous mixture for a period of time and under conditions operable to effect the reduction of the ore. Preferably the microorganism is Pseudomonas sp. 200 and the reduction conducted anaerobically with a domestic wastewater as the substrate. An aqueous solution containing soluble ferrous iron can be separated from the reacted mixture, treated with a base to precipitate ferrous hydroxide which can then be recovered as a concentrated slurry. 11 figs.

  3. Aluminum battery alloys

    DOE Patents [OSTI]

    Thompson, David S. (Richmond, VA); Scott, Darwin H. (Mechanicsville, VA)

    1985-01-01T23:59:59.000Z

    Aluminum alloys suitable for use as anode structures in electrochemical cs are disclosed. These alloys include iron levels higher than previously felt possible, due to the presence of controlled amounts of manganese, with possible additions of magnesium and controlled amounts of gallium.

  4. Aluminum battery alloys

    DOE Patents [OSTI]

    Thompson, D.S.; Scott, D.H.

    1984-09-28T23:59:59.000Z

    Aluminum alloys suitable for use as anode structures in electrochemical cells are disclosed. These alloys include iron levels higher than previously felt possible, due to the presence of controlled amounts of manganese, with possible additions of magnesium and controlled amounts of gallium.

  5. PREDICTION OF DEFORMATION AND HOT TEAR FORMATION USING A VISCOPLASTIC MODEL WITH DAMAGE

    E-Print Network [OSTI]

    Beckermann, Christoph

    of the hot tears. Introduction The automotive industry is showing greater interest in magnesium alloys as they have a high strength to weight ratio when compared to steel or aluminum alloys. Because of their low was 8.61% aluminum, 0.6% zinc, 0.23% manganese, 0.017% silicon, 0.003% copper, 0.0038% iron, 0

  6. Iron efficiency in sorghum

    E-Print Network [OSTI]

    Esty, James Craig

    1979-01-01T23:59:59.000Z

    ) James Craig Esty, B, S. , Panhandle State College Co-Chairmen of Advisory Committee: Dr. Arthur B. Onken Dr. Lloyd R. Hossner R tt *ht ' d f * ' g * gh L~Sh bicolor (L. ) Moenchj parental lines and Fl hybrids indicate varying degrees of iron (Fe...) utilization. Visual ratings after seven days of Fe stress indicated only one hybrid, ATx 378 x RTx 2536, to be green or Fe efficient. Hybrids or parental lines rated partially chlorotic were: ATx 378 x RTx 415 and RTx 2536. Those sorghums rated chlorotic...

  7. Minerals to Dairy Cows with Focus on Calcium and Magnesium Balance

    E-Print Network [OSTI]

    Minerals to Dairy Cows with Focus on Calcium and Magnesium Balance Cecilia Kronqvist Faculty;Minerals to Dairy Cows with Focus on Calcium and Magnesium Balance Abstract Both clinical and subclinical decreased plasma calcium levels and activated the calcium homeostatic mechanisms. However, there were

  8. SIMULATION OF STRESSES DURING CASTING OF BINARY MAGNESIUM-ALUMINUM ALLOYS M.G. Pokorny1

    E-Print Network [OSTI]

    Beckermann, Christoph

    SIMULATION OF STRESSES DURING CASTING OF BINARY MAGNESIUM-ALUMINUM ALLOYS M.G. Pokorny1 , C, Geesthacht, Germany Keywords: Magnesium Alloys, Casting, Stress Simulation Abstract A visco-plastic deformation model is used to predict thermal stresses during casting of binary Mg-Al alloys. The predictions

  9. Reliability of Laser Welding Process for ZE41A-T5 Magnesium Alloy Sand Castings

    E-Print Network [OSTI]

    Medraj, Mamoun

    Reliability of Laser Welding Process for ZE41A-T5 Magnesium Alloy Sand Castings Haider Al-Kazzaz1, National Research Council Canada, Montreal, Canada Laser welding is a promising joining method for magnesium alloys. The process reliability of 2-mm ZE41A-T5 butt joints welded by a 4 kW Nd:YAG laser

  10. In vitro corrosion and biocompatibility of binary magnesium alloys Xuenan Gu a

    E-Print Network [OSTI]

    Zheng, Yufeng

    In vitro corrosion and biocompatibility of binary magnesium alloys Xuenan Gu a , Yufeng Zheng a Corrosion In vitro Cytotoxicity Hemocompatibility a b s t r a c t As bioabsorbable materials, magnesium was used as control. Their mechanical properties, corrosion properties and in vitro biocompatibilities

  11. High Performance Batteries Based on Hybrid Magnesium and Lithium Chemistry

    SciTech Connect (OSTI)

    Cheng, Yingwen; Shao, Yuyan; Zhang, Jiguang; Sprenkle, Vincent L.; Liu, Jun; Li, Guosheng

    2014-01-01T23:59:59.000Z

    Magnesium and lithium (Mg/Li) hybrid batteries that combine Mg and Li electrochemistry, consisting of a Mg anode, a lithium-intercalation cathode and a dual-salt electrolyte with both Mg2+ and Li+ ions, were constructed and examined in this work. Our results show that hybrid (Mg/Li) batteries were able to combine the advantages of Li-ion and Mg batteries, and delivered outstanding rate performance (83% for capacities at 15C and 0.1C) and superior cyclic stability (~5% fade after 3000 cycles).

  12. Transcriptional and translational regulatory responses to iron...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    of Candidatus Pelagibacter ubique cultures to iron limitation in natural seawater media supplemented with a siderophore to chelate iron. MethodologyPrincipal Findings:...

  13. Carbon dioxide adsorbents containing magnesium oxide suitable for use at high temperatures

    DOE Patents [OSTI]

    Mayorga, Steven Gerard (Allentown, PA); Weigel, Scott Jeffrey (Allentown, PA); Gaffney, Thomas Richard (Allentown, PA); Brzozowski, Jeffrey Richard (Macungie, PA)

    2001-01-01T23:59:59.000Z

    Adsorption of carbon dioxide from gas streams at temperatures in the range of 300 to 500.degree. C. is carried out with a solid adsorbent containing magnesium oxide, preferably promoted with an alkali metal carbonate or bicarbonate so that the atomic ratio of alkali metal to magnesium is in the range of 0.006 to 2.60. Preferred adsorbents are made from the precipitate formed on addition of alkali metal and carbonate ions to an aqueous solution of a magnesium salt. Atomic ratios of alkali metal to magnesium can be adjusted by washing the precipitate with water. Low surface area adsorbents can be made by dehydration and CO.sub.2 removal of magnesium hydroxycarbonate, with or without alkali metal promotion. The process is especially valuable in pressure swing adsorption operations.

  14. (Data in thousand metric tons, gross weight, unless otherwise specified) Domestic Production and Use: Manganese ore containing 35% or more manganese was not produced domestically

    E-Print Network [OSTI]

    Torgersen, Christian

    of ore were used for such nonmetallurgical purposes as production of dry cell batteries, as an ingredient Recycling: Scrap recovery specifically for manganese was negligible, but a significant amount was recycled inventory inventory for disposal FY 2001 FY 2001 Battery: Natural ore 103 0.2 103 27 1 Synthetic dioxide 3

  15. (Data in thousand metric tons, gross weight, unless noted) Domestic Production and Use: Manganese ore containing 35% or more manganese was not produced domestically

    E-Print Network [OSTI]

    Torgersen, Christian

    purposes as producing dry cell batteries, as an ingredient in plant fertilizers and animal feed Recycling: Scrap recovery specifically for manganese was negligible, but a significant amount was recycled of nonstockpile- grade materials, as follows: 16,400 tons of natural battery ore, 81 tons of chemical ore, and 392

  16. (Data in thousand metric tons, gross weight, unless otherwise specified) Domestic Production and Use: Manganese ore containing 35% or more manganese was not produced domestically

    E-Print Network [OSTI]

    Torgersen, Christian

    for such nonmetallurgical purposes as producing dry cell batteries, as an ingredient in plant fertilizers and animal feed Recycling: Scrap recovery specifically for manganese was negligible, but a significant amount was recycled inventories of nonstockpile-grade materials, as follows, in tons: natural battery ore, 16,800; chemical ore

  17. (Data in thousand metric tons, gross weight, unless otherwise specified) Domestic Production and Use: Manganese ore containing 35% or more manganese was not produced domestically

    E-Print Network [OSTI]

    Torgersen, Christian

    of ore were used for such nonmetallurgical purposes as production of dry cell batteries, as an ingredient Recycling: Scrap recovery specifically for manganese was negligible, but a significant amount was recycled, as follows, in tons: natural battery, 16,800, and metallurgical, 331,000. Prepared by Thomas S. Jones [(703

  18. (Data in thousand metric tons, gross weight, unless otherwise specified) Domestic Production and Use: Manganese ore containing 35% or more manganese was not produced domestically

    E-Print Network [OSTI]

    Torgersen, Christian

    for such nonmetallurgical purposes as producing dry cell batteries, as an ingredient in plant fertilizers and animal feed Recycling: Scrap recovery specifically for manganese was negligible, but a significant amount was recycled of nonstockpile-grade materials, as follows: 16,400 tons of natural battery ore, 81 tons of chemical ore, and 392

  19. Oxygen, {\\alpha}-element and iron abundance distributions in the inner part of the Galactic thin disc

    E-Print Network [OSTI]

    Martin, R P; Kovtyukh, V V; Korotin, S A; Yegorova, I A; Saviane, Ivo

    2015-01-01T23:59:59.000Z

    We derived elemental abundances in 27 Cepheids, the great majority situated within a zone of Galactocentric distances ranging from 5 to 7 kpc. One star of our sample, SU Sct, has a Galactocentric distance of about 3 kpc, and thus falls in a poorly investigated region of the inner thin disc. Our new results, combined with data on abundances in the very central part of our Galaxy taken from literature, show that iron, magnesium, silicon, sulfur, calcium and titanium LTE abundance radial distributions, as well as NLTE distribution of oxygen reveal a plateau-like structure or even positive abundance gradient in the region extending from the Galactic center to about 5 kpc.

  20. Southern Ocean Iron Experiment (SOFex)

    SciTech Connect (OSTI)

    Coale, Kenneth H.

    2005-07-28T23:59:59.000Z

    The Southern Ocean Iron Experiment (SOFeX) was an experiment decades in the planning. It's implementation was among the most complex ship operations that SIO has been involved in. The SOFeX field expedition was successful in creating and tracking two experimentally enriched areas of the Southern Ocean, one characterized by low silicic acid, one characterized by high silicic acid. Both experimental sites were replete with abundant nitrate. About 100 scientists were involved overall. The major findings of this study were significant in several ways: (1) The productivity of the southern ocean is limited by iron availability. (2) Carbon uptake and flux is therefore controlled by iron availability (3) In spite of low silicic acid, iron promotes non-silicious phytoplankton growth and the uptake of carbon dioxide. (4) The transport of fixed carbon from the surface layers proceeds with a C:N ratio that would indicate differential remineralization of nitrogen at shallow depths. (5) These finding have major implications for modeling of carbon export based on nitrate utilization. (6) The general results of the experiment indicate that, beyond other southern ocean enrichment experiments, iron inputs have a much wider impact of productivity and carbon cycling than previously demonstrated. Scientific presentations: Coale, K., Johnson, K, Buesseler, K., 2002. The SOFeX Group. Eos. Trans. AGU 83(47) OS11A-0199. Coale, K., Johnson, K. Buesseler, K., 2002. SOFeX: Southern Ocean Iron Experiments. Overview and Experimental Design. Eos. Trans. AGU 83 (47) OS22D-01. Buesseler, K.,et al. 2002. Does Iron Fertilization Enhance Carbon Sequestration? Particle flux results from the Southern Ocean Iron Experiment. Eos. Trans. AGU 83 (47), OS22D-09. Johnson, K. et al. 2002. Open Ocean Iron Fertilization Experiments From IronEx-I through SOFeX: What We Know and What We Still Need to Understand. Eos. Trans. AGU 83 (47), OS22D-12. Coale, K. H., 2003. Carbon and Nutrient Cycling During the Southern Ocean Iron Enrichment Experiments. Seattle, WA. Geological Society of America. Coale, K., 2003. Open Ocean Iron Enrichment Experiments: What they have told us, what they have not. American Society for Limnology and Oceanography and The Oceanography Society, Honolulu, February 2004. Coale, K., 2004. Recent Research from the Southern Ocean Iron Experiment (SOFeX), in Taking the Heat: What is the impact of ocean fertilization on climate and ocean ecology? Science of earth and sky. AAAS, February 12-16, Seattle, WA

  1. Real-time x-ray absorption spectroscopy of uranium, iron, and manganese in contaminated sediments during bioreduction

    E-Print Network [OSTI]

    Tokunaga, T.K.

    2008-01-01T23:59:59.000Z

    National Laboratory, Berkeley, California 94720 University of Chicago, Chicago, Illinois 60637 Savannah River

  2. Real-time x-ray absorption spectroscopy of uranium, iron, and manganese in contaminated sediments during bioreduction

    E-Print Network [OSTI]

    Tokunaga, T.K.

    2008-01-01T23:59:59.000Z

    to Mn(II) in sediments infused with OC ? 3 mM. However, Fecontaminated sediments were infused with a steady supply ofspectra obtained on sediments infused with 30 and 100 mM OC

  3. Real-time x-ray absorption spectroscopy of uranium, iron, and manganese in contaminated sediments during bioreduction

    SciTech Connect (OSTI)

    Tokunaga, Tetsu; Tokunaga, T.K.; Wan, J.; Kim, Y.; Sutton, S.R.; Newville, M.; Lanzirotti, A.; Rao, W.

    2008-01-15T23:59:59.000Z

    The oxidation status of uranium in sediments is important because the solubility of this toxic and radioactive element is much greater for U(VI) than for U(IV) species. Thus, redox manipulation to promote precipitation of UO{sub 2} is receiving interest as a method to remediate U-contaminated sediments. Presence of Fe and Mn oxides in sediments at much higher concentrations than U requires understanding of their redox status as well. This study was conducted to determine changes in oxidation states of U, Fe, and Mn in U-contaminated sediments from Oak Ridge National Laboratory. Oxidation states of these elements were measured in real-time and nondestructively using X-ray absorption spectroscopy, on sediment columns supplied with synthetic groundwater containing organic carbon (OC, 0, 3, 10, 30 and 100 mM OC as lactate) for over 400 days. In sediments supplied with OC {ge} 30 mM, 80% of the U was reduced to U(IV), with transient reoxidation at about 150 days. Mn(III,IV) oxides were completely reduced to Mn(II) in sediments infused with OC {ge} 3 mM. However, Fe remained largely unreduced in all sediment columns, showing that Fe(III) can persist as an electron acceptor in reducing sediments over long times. This result in combination with the complete reduction of all other potential electron acceptors supports the hypothesis that the reactive Fe(III) fraction was responsible for reoxidizing U(IV).

  4. Real-time x-ray absorption spectroscopy of uranium, iron, and manganese in contaminated sediments during bioreduction

    E-Print Network [OSTI]

    Tokunaga, T.K.

    2008-01-01T23:59:59.000Z

    precipitation of uranyl on goethite. Environmental Science23 used were hematite and goethite for Fe(III), and fayaliteenergies for hematite and goethite standards were 7,114.9 ±

  5. Report on Energy Deposition Calculations on the Magnesium Diboride Superconducting Links for the Cold Powering System Deliverable: D6.6

    E-Print Network [OSTI]

    Bignami, A; Santini, C

    2015-01-01T23:59:59.000Z

    Report on Energy Deposition Calculations on the Magnesium Diboride Superconducting Links for the Cold Powering System

  6. Abstract Dormant spores of the marine Bacillus sp. strain SG-1 catalyze the oxidation of manganese(II),

    E-Print Network [OSTI]

    Tebo, Brad

    , MnxG was overexpressed in Escherichia coli and used to generate polyclonal antibodies. Western blotAbstract Dormant spores of the marine Bacillus sp. strain SG-1 catalyze the oxidation of manganese Introduction Mature spores of the marine Bacillus sp. strain SG-1 oxi- dize soluble manganese [Mn(II)], thereby

  7. Element-and site-specific oxidation state and cation distribution in manganese ferrite films by diffraction anomalous fine structure

    E-Print Network [OSTI]

    Haskel, Daniel

    Element- and site-specific oxidation state and cation distribution in manganese ferrite films Received 2 April 2008; accepted 9 July 2008; published online 8 August 2008 Epitaxial manganese ferrite.1063/1.2969406 Spinel ferrites represent an important class of materials that provide high permeability, moderate

  8. Method for reducing iron losses in an iron smelting process

    DOE Patents [OSTI]

    Sarma, Balu (Airmont, NY); Downing, Kenneth B. (Greenville, SC)

    1999-01-01T23:59:59.000Z

    A process of smelting iron that comprises the steps of: a) introducing a source of iron oxide, oxygen, nitrogen, and a source of carbonaceous fuel to a smelting reactor, at least some of said oxygen being continuously introduced through an overhead lance; b) maintaining conditions in said reactor to cause (i) at least some of the iron oxide to be chemically reduced, (ii) a bath of molten iron to be created and stirred in the bottom of the reactor, surmounted by a layer of slag, and (iii) carbon monoxide gas to rise through the slag; c) causing at least some of said carbon monoxide to react in the reactor with the incoming oxygen, thereby generating heat for reactions taking place in the reactor; and d) releasing from the reactor an offgas effluent, is run in a way that keeps iron losses in the offgas relatively low. After start-up of the process is complete, steps (a) and (b) are controlled so as to: e) keep the temperature of the molten iron at or below about 1550.degree. C. and f) keep the slag weight at or above about 0.8 tonne per square meter.

  9. Method for reducing iron losses in an iron smelting process

    DOE Patents [OSTI]

    Sarma, B.; Downing, K.B.

    1999-03-23T23:59:59.000Z

    A process of smelting iron that comprises the steps of: (a) introducing a source of iron oxide, oxygen, nitrogen, and a source of carbonaceous fuel to a smelting reactor, at least some of said oxygen being continuously introduced through an overhead lance; (b) maintaining conditions in said reactor to cause (1) at least some of the iron oxide to be chemically reduced, (2) a bath of molten iron to be created and stirred in the bottom of the reactor, surmounted by a layer of slag, and (3) carbon monoxide gas to rise through the slag; (c) causing at least some of said carbon monoxide to react in the reactor with the incoming oxygen, thereby generating heat for reactions taking place in the reactor; and (d) releasing from the reactor an offgas effluent, is run in a way that keeps iron losses in the offgas relatively low. After start-up of the process is complete, steps (a) and (b) are controlled so as to: (1) keep the temperature of the molten iron at or below about 1550 C and (2) keep the slag weight at or above about 0.8 ton per square meter. 13 figs.

  10. Iron catalyzed coal liquefaction process

    DOE Patents [OSTI]

    Garg, Diwakar (Macungie, PA); Givens, Edwin N. (Bethlehem, PA)

    1983-01-01T23:59:59.000Z

    A process is described for the solvent refining of coal into a gas product, a liquid product and a normally solid dissolved product. Particulate coal and a unique co-catalyst system are suspended in a coal solvent and processed in a coal liquefaction reactor, preferably an ebullated bed reactor. The co-catalyst system comprises a combination of a stoichiometric excess of iron oxide and pyrite which reduce predominantly to active iron sulfide catalysts in the reaction zone. This catalyst system results in increased catalytic activity with attendant improved coal conversion and enhanced oil product distribution as well as reduced sulfide effluent. Iron oxide is used in a stoichiometric excess of that required to react with sulfur indigenous to the feed coal and that produced during reduction of the pyrite catalyst to iron sulfide.

  11. Iron and Steel Energy Intensities

    U.S. Energy Information Administration (EIA) Indexed Site

    If you are having trouble, call 202-586-8800 for help. Home > >Energy Users > Energy Efficiency Page > Iron and Steel Energy Intensities First Use of Energy Blue Bullet First Use...

  12. Process for the synthesis of iron powder

    DOE Patents [OSTI]

    Not Available

    1982-03-06T23:59:59.000Z

    A process for preparing iron powder suitable for use in preparing the iron-potassium perchlorate heat-powder fuel mixture used in thermal batteries, comprises preparing a homogeneous, dense iron oxide hydroxide precipitate by homogeneous precipitation from an aqueous mixture of a ferric salt, formic or sulfuric acid, ammonium hydroxide and urea as precipitating agent; and then reducing the dense iron oxide hydroxide by treatment with hydrogen to prepare the iron powder.

  13. Process for the synthesis of iron powder

    DOE Patents [OSTI]

    Welbon, W.W.

    1983-11-08T23:59:59.000Z

    A process for preparing iron powder suitable for use in preparing the iron-potassium perchlorate heat-powder fuel mixture used in thermal batteries, comprises preparing a homogeneous, dense iron oxide hydroxide precipitate by homogeneous precipitation from an aqueous mixture of a ferric salt, formic or sulfuric acid, ammonium hydroxide and urea as precipitating agent; and then reducing the dense iron oxide hydroxide by treatment with hydrogen to prepare the iron powder. 2 figs.

  14. Honeywell Modular Automation System Computer Software Documentation for the Magnesium Hydroxide Precipitation Process

    SciTech Connect (OSTI)

    STUBBS, A.M.

    2001-06-25T23:59:59.000Z

    The purpose of this Computer Software Document (CSWD) is to provide configuration control of the Honeywell Modular Automation System (MAS) in use at the Plutonium Finishing Plant (PFP) for the Magnesium Hydroxide Precipitation Process in Rm 230C/234-5Z. The magnesium hydroxide process control software Rev 0 is being updated to include control programming for a second hot plate. The process control programming was performed by the system administrator. Software testing for the additional hot plate was performed per PFP Job Control Work Package 2Z-00-1703. The software testing was verified by Quality Control to comply with OSD-Z-184-00044, Magnesium Hydroxide Precipitation Process.

  15. Effects of dietary potassium and sodium on magnesium and potassium balance in lambs 

    E-Print Network [OSTI]

    Poe, Julie Hamilton

    1984-01-01T23:59:59.000Z

    of magnesium oxide and trace mineralized salt with either molasses, cottonseed meal, dry sugarcane or steamed bone meal was consumed by lactating beef cows at a significantly (P), 05) higher level than magnesium oxide and trace mineralized salt (1:1) alone...EFFECTS OF DIETARY POTASSIUM AND SODIUM ON MAGNESIUM AND POTASSIUM BALANCE IN LAMBS A Thesis by JULIE HAMILTON POE Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER...

  16. Hyperthermia HeLa cell treatment with silica coated manganese oxide nanoparticles

    E-Print Network [OSTI]

    Villanueva, A; Alonso, JM; Rueda, T; Martínez, A; Crespo, P; Morales, MP; Fernandez, MA Gonzalez; Valdes, J; Rivero, G

    2009-01-01T23:59:59.000Z

    HeLa tumour cells incubated with ferromagnetic nanoparticles of manganese oxide perovskite La0.56(SrCa)0.22MnO3 were treated with a high frequency alternating magnetic field. The particles were previously coated with silica to improve their biocompatibility. The control assays made with HeLa tumour cells showed that cell survival and growth rate were not affected by the particle internalization in cells, or by the electromagnetic field on cells without nanoparticles. The application of an alternating electromagnetic field to cells incubated with this silica coated manganese oxide induced a significant cellular damage that finally lead to cell death by an apoptotic mechanism.

  17. The connection between the damping capacity and the crystal structure of some copper-manganese alloys

    E-Print Network [OSTI]

    McCrary, Leon Eldon

    1960-01-01T23:59:59.000Z

    THE CONNECTION BETHEEN THE DANPIING CAPACIITY AND THE CRYSTAL STRUCTURE OF SOME COPPER-MANGANESE ALLOYS A Thesis By Leon Eldon McCrary Submitted to the Graduate School of the Agricultural and Mechanlcai College of Texas ln partial fulfil... lment of the requirements for the degree of MASTER OF SCIIENCE August 'l960 Major Sub)ect: Physics THE CONNECTION BETWEEN THE DAMPING CAPACITY AND THE CRYSTAL STRUCTURE OF SOME COPPER-MANGANESE ALLOYS A Thesis By Leon E I don McC ra ry Approved...

  18. The magnesium nutrition of cotton as influenced by sodium

    E-Print Network [OSTI]

    Thenabadu, Mervyn Wellesly

    1964-01-01T23:59:59.000Z

    -oa:, cld c:t. r. p alit ir a. clans as inrluenced ty siagnesium ard s jiL I . -'?'g"rs f:ct:o" pi ants at weekls lr ti rvdls as it' flL1 reed oy Htdg;1. S1L'm dl. d s 'dium R eld ls. ? chlcr opr yl contet t 1;. inrlu?. . ced ty magnesium ard sc... 1 . au=? as ol m R La=. te carctencio cnt?nt c:r ir. flu reed by maga siu?m arid sc edt. S o LU'm 615 . be distr ibu" c rr c f day - Ld ccttcr pl Cd 10rs li. l;':LSS? Ci 30 at' s distr ibu7 ic. . cf 6G-day olo cct cn radgr. esrum ar. d...

  19. Explorations of iron-iron hydrogenase active site models by experiment and theory 

    E-Print Network [OSTI]

    Tye, Jesse Wayne

    2009-05-15T23:59:59.000Z

    This dissertation describes computational and experimental studies of synthetic complexes that model the active site of the iron-iron hydrogenase [FeFe]H2ase enzyme. Simple dinuclear iron dithiolate complexes act as functional models of the ironiron...

  20. Explorations of iron-iron hydrogenase active site models by experiment and theory

    E-Print Network [OSTI]

    Tye, Jesse Wayne

    2009-05-15T23:59:59.000Z

    This dissertation describes computational and experimental studies of synthetic complexes that model the active site of the iron-iron hydrogenase [FeFe]H2ase enzyme. Simple dinuclear iron dithiolate complexes act as functional models of the ironiron...

  1. anaemia iron deficiency: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Bhaniani, Amit 2009-05-29 5 Correcting Iron Deficiencies in Soybean with Foliar Iron Fertilizer Engineering Websites Summary: Correcting Iron Deficiencies in Soybean with Foliar...

  2. Occupancy and site distribution of europium in barium magnesium aluminate Eu Mossbauer spectroscopy

    E-Print Network [OSTI]

    Boolchand, Punit

    Occupancy and site distribution of europium in barium magnesium aluminate by 151 Eu Mo¨ssbauer Mo¨ssbauer spectroscopy. Analysis of the Mo¨ssbauer line shapes reveals a pentamodal or higher site

  3. Effect of Texture on Formability and Mechanical Anisotropy of a Severe Plastically Deformed Magnesium Alloy

    E-Print Network [OSTI]

    Modarres Razavi, Sonia

    2012-02-14T23:59:59.000Z

    Magnesium and its alloys have been considered as alternatives to aluminum alloys and steels for structural applications in automotive and aerospace applications due to their superior specific strength and light-weight. However, they have hexagonal...

  4. High-strain-rate nanoindentation behavior of fine-grained magnesium alloys

    E-Print Network [OSTI]

    Somekawa, Hidetoshi

    The effects of temperature and alloying elements on deformation in the high-strain-rate regime were investigated by testing fine-grained magnesium alloys with an average grain size of 2 ? 3 ?m by a nanoindentation technique. ...

  5. Magnesium Silicate Dissolution Investigated by 29Si MAS, 1H-29Si...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Silicate Dissolution Investigated by 29Si MAS, 1H-29Si CP MAS, 25Mg QCPMG, and 1H-25Mg CP QCPMG NMR. Magnesium Silicate Dissolution Investigated by 29Si MAS, 1H-29Si CP MAS, 25Mg...

  6. Vehicle Technologies Office: Long-Term Lightweight Materials Research (Magnesium and Carbon Fiber)

    Broader source: Energy.gov [DOE]

    The Vehicle Technologies Office supports research into magnesium and carbon fiber reinforced composites, which could reduce the weight of some components by 50-75 percent in the long-term.

  7. az91d magnesium alloy: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Page Last Page Topic Index 1 Studies on the inuence of chloride ion and pH on the corrosion and electrochemical behaviour of AZ91D magnesium alloy Engineering Websites Summary:...

  8. az91d magnesium alloys: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Page Last Page Topic Index 1 Studies on the inuence of chloride ion and pH on the corrosion and electrochemical behaviour of AZ91D magnesium alloy Engineering Websites Summary:...

  9. Vehicle Technologies Office Merit Review 2015: Magnesium-Intensive Front End Sub-Structure Development

    Broader source: Energy.gov [DOE]

    Presentation given by USAMP at 2015 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Office Annual Merit Review and Peer Evaluation Meeting about magnesium-intensive front end sub...

  10. Effect of Texture on Formability and Mechanical Anisotropy of a Severe Plastically Deformed Magnesium Alloy 

    E-Print Network [OSTI]

    Modarres Razavi, Sonia

    2012-02-14T23:59:59.000Z

    Magnesium and its alloys have been considered as alternatives to aluminum alloys and steels for structural applications in automotive and aerospace applications due to their superior specific strength and light-weight. However, they have hexagonal...

  11. The effects of exercise and dietary fat on calcium, magnesium, iron, and zinc on selected tissues in rats

    E-Print Network [OSTI]

    Nguyen, Thuy Huong

    1989-01-01T23:59:59.000Z

    and had a 12-hour photoperiod. Cages were lined with woodchip bedding, and stainless steel feeders were used. Design Following a three-day acclimation period, during which rats were fed the control diet, the rats were weighed and randomly assigned...

  12. Magnesium and pyridoxine intake and mineral content of selected tissues and physical development in rats

    E-Print Network [OSTI]

    Edgar, Susan Elaine

    1986-01-01T23:59:59.000Z

    MAGNESIUM AND PYRIDOXINE INTAKE MINERAL CONTENT OF SELECTED TISSUES PHYSICAL DEVELOPMENT IN RATS A Thesis by SU S AN ELA I NE EDGAR Submitted to the Graduate College of Texas A8rM University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE August 1986 Major Subject: Nutrition MAGNESIUM AND PYRIDOXINE INTAKE MINERAL CONTENT OF SELECTED TISSUES PHYS ICAL DEVELOPMENT IN RATS A Thesis by SUSAN ELAINE EDGAR Approved as to style and content by: 'KAREN...

  13. The oxidative dimerization of methane over promoted and unpromoted magnesium oxide monoliths

    E-Print Network [OSTI]

    Aigler, Jane Marie

    1989-01-01T23:59:59.000Z

    for the degree of MASTER OF SCIENCE May 1989 Major Subject: Chemistry THE OXIDATIVE DIMERIZATION OF METHANE OVER PROMOTED AND UNPROMOTED MAGNESIUM OxiDE MONOLITHS A Thesis by JANE MARIE AIGLER Approved as to style and content by: uns or (Chair of Commi... ee) os e (Member) nt ony (Member) a (Head of Department) May 1989 ABSTRACT The Oxidative Dimerization of Methane over Promoted and Unpromoted Magnesium Oxide Monoliths. (May 1989) Jane Marie Aigier, B. S. , Pennsylvania State University...

  14. A study of the role of calcium and magnesium in casein micellar structure in human milk 

    E-Print Network [OSTI]

    Gallaway, Sheila Ann

    1988-01-01T23:59:59.000Z

    ) Karen . Kubena (Member) Wa ne L. R&cko11 (Member) G. C. Smith (Head of Department) December 1988 ABSTRACT A Study of the Role of Calcium and Magnesium in Casein Micellar Structure in Human Milk. (December 1988) Sheila Ann Gallaway, B, S.... , Texas ASM University; M. S. , Texas ASM University Chair of Advisory Committee: Dr. C. W. Dill The effects of EDTA, phosphatase hydrolysis, calcium chloride, and magnesium chloride on human casein micelles were observed using electron microscopy...

  15. Magnesium deficiency and type of protein during gestation and lactation in rats 

    E-Print Network [OSTI]

    Holmes, Kathryn Ellen Hughes

    1988-01-01T23:59:59.000Z

    MAGNESIUM DEFICIENCY AND TYPE OF PROTEIN DURING GESTATION AND LACTATION IN RATS A Thesis by KATHRYN ELLEN HUGHES HOLMES Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE August 1988 Major Subject: Nutrition MAGNESIUM DEFICIENCY AND TYPE OF PROTEIN DURING GESTATION AND LACTATION IN RATS A Thesis by KATHRYN ELLEN HUGHES HOLMES Approved as to style and content by: Karen S. Kubena (Chair...

  16. An examination of the relationship between calcium and magnesium and hypertension 

    E-Print Network [OSTI]

    Georghiades, Mary Elizabeth

    1988-01-01T23:59:59.000Z

    AN EXAMINATION QF Tl-IE RELATIONSHIP BETWEEN CALCILIM AND MAGNESIUM AND HYPERTENSION A Thesis by MARY ELIZABETH GEORGHIADES Submitted to the Graduate College of Texas ARM University in partial Fulfillment of the requirements For the degree... of MASTER QF SCIENCE May 1988 Major Subject. : Nutrition AN EXAMINATION OF THE RELATIONSHIP BETWEEN CALCIUM AND MAGNESIUM AND HYPERTENSION A Thesis by MARY ELIZABETH GEORGH I ADES Approved as to style and content by: Karen S. Kubena (Chair...

  17. The tolerance of two varieties of cotton to relatively high levels of sodium and magnesium 

    E-Print Network [OSTI]

    Parekh, Manhar C

    1969-01-01T23:59:59.000Z

    THE TO'ERANCE OF TNO VARIETIES OF COTTON TO RELATIVELY HIGH LEVELS OF SODIUM AND MAGNESIUM A Tnesis by Msnhar C. Parekh Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree...) (Nember) (Nemb ) August 1969 ABSTRACT The Tolerance of Two Varieties of Cotton to Relatively High Levels of Sodium and Magnesium. (August 1969) Masher C. Parekh, B. S. , Gujarat University, Directed by: Dr. H. E. Joham An experiment was conducted...

  18. Mechanical Flow Response and Anisotropy of Ultra-Fine Grained Magnesium and Zinc Alloys 

    E-Print Network [OSTI]

    Al Maharbi, Majid H.

    2011-02-22T23:59:59.000Z

    MECHANICAL FLOW RESPONSE AND ANISOTROPY IN ULTRA-FINE GRAINED MAGNESIUM AND ZINC ALLOYS A Dissertation by MAJID AL MAHARBI Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of DOCTOR OF PHILOSOPHY December 2009 Major Subject: Materials Science and Engineering MECHANICAL FLOW RESPONSE AND ANISOTROPY IN ULTRA-FINE GRAINED MAGNESIUM AND ZINC ALLOYS A Dissertation by MAJID AL...

  19. Determination of the concentrations of magnesium and aluminum in alloys by laser produced atomic emission spectroscopy 

    E-Print Network [OSTI]

    Ashe, William Monroe

    1997-01-01T23:59:59.000Z

    DETERMINATION OF THE CONCENTRATIONS OF MAGNESIUM AND ALUiiINUM IN ALLOYS BY LASER PRODUCED ATOMIC EMISSION SPECTROSCOPY A Thesis by WILLIAM MONROE ASHE Submitted to the Office of Graduate Studies of Texas A&M University in partial... fulfillment of the reqmrements for the degree of MASTER OF SCIENCE December 1997 Major Subject: Physics DETERMINATION OF THE CONCENTRATIONS OF MAGNESIUM AND ALUMINUM ALLOYS BY LASER PRODUCED ATOMIC EMISSION SPECTROSCOPY A Thesis by WILLIAM MONROE ASHE...

  20. Blood pressure and red blood cell magnesium, potassium, and calcium responses to dietary fats 

    E-Print Network [OSTI]

    Wehrman, Noreen Elaine

    1993-01-01T23:59:59.000Z

    for the degree of MASTER OF SCIENCE August 1993 Major Subject: Nutrition BLOOD PRESSURE AND RED BLOOD CELL MAGNESIUM, POTASSIUM, AND CALCIUM RESPONSES TO DIETARY FATS A Thesis by NOREEN ELAINE WEHRMAN Submitted to Texas A&M University in partial.... Edwards (Head of Department) August 1993 Major Subject: Nutrition ABSTRACT Blood Pressure and Red Blood Cell Magnesium, Potassium, and Calcium Responses to Dietary Fats, (August 1993) Noreen Elaine Wehrman, B. S. , Pennsylvania State University...

  1. Novel Nonflammable Electrolytes for Secondary Magnesium Batteries and High Voltage Electrolytes for Electrochemcial Supercapacitors

    SciTech Connect (OSTI)

    Dr. Brian Dixon

    2008-12-30T23:59:59.000Z

    Magnesium has been used successfully in primary batteries, but its use in rechargeable cells has been stymied by the lack of suitable non-aqueous electrolyte that can conduct Mg+2 species, combined with poor stripping and plating properties. The development of a suitable cathode material for rechargeable magnesium batteries has also been a roadblock, but a nonflammable electrolyte is key. Likewise, the development of safe high voltage electrochemical supercapaitors has been stymied by the use of flammable solvents in the liquid electrolyte; to wit, acetonitrile. The purpose of the research conducted in this effort was to identify useful compositions of magnesium salts and polyphosphate solvents that would enable magnesium ions to be cycled within a secondary battery design. The polyphosphate solvents would provide the solvent for the magnesium salts while preventing the electrolyte from being flammable. This would enable these novel electrolytes to be considered as an alternative to THF-based electrolytes. In addition, we explored several of these solvents together with lithium slats for use as high voltage electrolytes for carbon-based electrochemical supercapacitors. The research was successful in that: 1) Magnesium imide dissolved in a phosphate ester solvent that contains a halogented phosphate ester appears to be the preferred electrolyte for a rechargeable Mg cell. 2) A combination of B-doped CNTs and vanadium phosphate appear to be the cathode of choice for a rechargeable Mg cell by virtue of higher voltage and better reversibility. 3) Magnesium alloys appear to perform better than pure magnesium when used in combination with the novel polyphosphate electrolytes. Also, this effort has established that Phoenix Innovationâ??s family of phosphonate/phosphate electrolytes together with specific lithium slats can be used in supercapacitor systems at voltages of greater than 10V.

  2. Hot Coal Gas Desulfurization With Manganese-Based Sorbents

    SciTech Connect (OSTI)

    Berns, J.J.; Hepworth, M.T. [Dept. of Civil Engineering, Univ. of Minnesota, Minneapolis, MN (United States)

    1996-12-31T23:59:59.000Z

    The objective of this project is to develop a pellet formulation which is capable of achieving low sulfur partial pressures and a high capacity for sulfur, loaded from a hot fuel gas and which is readily regenerable. Furthermore the pellet must be strong for potential use in a fluidized and regenerable over many cycles of loading and regeneration. Regeneration should be in air or oxygen-depleted air to produce a high-concentration sulfur dioxide. Fixed-bed tests were conducted with several formulations of manganese sesquioxide and titania, and alumina. They were subject to a simplified fuel gas of the oxygen-blown Shell type spiked with a 30,000 ppmv concentration of H{sub 2}S. Pellet crush strengths for 4 and 2 mm diameter pellets was typically 12 lbs per pellet and 4 lbs per pellet, respectively. For the most favorable of the formulations tested and under the criteria of break-through at less than 100 ppmv H{sub 2}S and loading temperatures of 5000 {degrees}C and an empty-bed space velocity of 4, 000 per hour, breakthrough occurred an effective loading of sulfur of 27 to 29% over 5 loading and regeneration cycles. At 90% of this saturation condition, the observed level of H{sub 2}S was below 10 ppmv. For regeneration, a temperature of 9000 {degrees}C is required to dissociate the sulfide into sulfur dioxide using air at atmospheric pressure. The mean sulfur dioxide concentration which is achieved during regeneration is 8% with empty-bed space velocities of 700/hr. TGA tests on individual pellets indicate that bentonite is not desirable as a bonding material and that Mn/Ti ratios higher than 7:1 produce relatively non-porous pellets. Whereas the reactivity is rapid below 12% conversion, the kinetics of conversion decreased significantly above this level. This observation may be the result of plugging of the pellet pores with sulfided product creating inaccessible pore volumes or alternately an increase in diffusional resistance by formation of MnS.

  3. MANGANESE DEFICIENCIES IN INDIANA SOILS Sylvie M. Brouder, Purdue Soil Fertility Specialist

    E-Print Network [OSTI]

    Brouder, Sylvie

    MANGANESE DEFICIENCIES IN INDIANA SOILS Sylvie M. Brouder, Purdue Soil Fertility Specialist Andrea S. Bongen and barley. #12;4 AY-276-W Table 2. M anganese fertilizers and suggestions for their use in banded/row starter application (B nd) and foliar application (Fol). B roadcast applications are not recom m ended

  4. Localization and Role of Manganese Superoxide Dismutase in a Marine Diatom1[OA

    E-Print Network [OSTI]

    the product in Escherichia coli, and purified the mature protein (TpMnSOD). This recombinant enzyme was usedLocalization and Role of Manganese Superoxide Dismutase in a Marine Diatom1[OA] Felisa Wolfe-Simon2 and Molecular Ecology Program, Institute of Marine and Coastal Sciences (F.W.-S., O.S., P.G.F.), and Department

  5. The effect of paramagnetic manganese cations on 1 H MR spectroscopy of the brain

    E-Print Network [OSTI]

    The effect of paramagnetic manganese cations on 1 H MR spectroscopy of the brain K. S. Madsen1 has investigated the effect of Mn on 1 H MR spectroscopy using an in vivo Mn-enhanced optic tract into a stereotactic device. Images and 1 H MR spectra were acquired using a Varian 4.7T animal scanner together

  6. Effects of the Exposure to Corrosive Salts on the Frictional Behavior of Gray Cast Iron and a Titanium-Based Metal Matrix Composite

    SciTech Connect (OSTI)

    Blau, Peter Julian [ORNL; Truhan, Jr., John J [ORNL; Kenik, Edward A [ORNL

    2007-01-01T23:59:59.000Z

    The introduction of increasingly aggressive road-deicing chemicals has created significant and costly corrosion problems for the trucking industry. From a tribological perspective, corrosion of the sliding surfaces of brakes after exposure to road salts can create oxide scales on the surfaces that affect friction. This paper describes experiments on the effects of exposure to sodium chloride and magnesium chloride sprays on the transient frictional behavior of cast iron and a titanium-based composite sliding against a commercial brake lining material. Corrosion scales on cast iron initially act as abrasive third-bodies, then they become crushed, spread out, and behave as a solid lubricant. The composition and subsurface microstructures of the corrosion products on the cast iron were analyzed. Owing to its greater corrosion resistance, the titanium composite remained scale-free and its frictional response was markedly different. No corrosion scales were formed on the titanium composite after aggressive exposure to salts; however, a reduction in friction was still observed. Unlike the crystalline sodium chloride deposits that tended to remain dry, hygroscopic magnesium chloride deposits absorbed ambient moisture from the air, liquefied, and retained a persistent lubricating effect on the titanium surfaces.

  7. Effect of intranasal manganese administration on neurotransmission and spatial learning in rats

    SciTech Connect (OSTI)

    Blecharz-Klin, Kamilla; Piechal, Agnieszka; Joniec-Maciejak, Ilona; Pyrzanowska, Justyna; Widy-Tyszkiewicz, Ewa, E-mail: etyszkiewicz@wum.edu.pl

    2012-11-15T23:59:59.000Z

    The effect of intranasal manganese chloride (MnCl{sub 2}·4H{sub 2}O) exposure on spatial learning, memory and motor activity was estimated in Morris water maze task in adult rats. Three-month-old male Wistar rats received for 2 weeks MnCl{sub 2}·4H{sub 2}O at two doses the following: 0.2 mg/kg b.w. (Mn0.2) or 0.8 mg/kg b.w. (Mn0.8) per day. Control (Con) and manganese-exposed groups were observed for behavioral performance and learning in water maze. ANOVA for repeated measurements did not show any significant differences in acquisition in the water maze between the groups. However, the results of the probe trial on day 5, exhibited spatial memory deficits following manganese treatment. After completion of the behavioral experiment, the regional brain concentrations of neurotransmitters and their metabolites were determined via HPLC in selected brain regions, i.e. prefrontal cortex, hippocampus and striatum. ANOVA demonstrated significant differences in the content of monoamines and metabolites between the treatment groups compared to the controls. Negative correlations between platform crossings on the previous platform position in Southeast (SE) quadrant during the probe trial and neurotransmitter turnover suggest that impairment of spatial memory and cognitive performance after manganese (Mn) treatment is associated with modulation of the serotonergic, noradrenergic and dopaminergic neurotransmission in the brain. These findings show that intranasally applied Mn can impair spatial memory with significant changes in the tissue level and metabolism of monoamines in several brain regions. -- Highlights: ? Intranasal exposure to manganese in rats impairs spatial memory in the water maze. ? Regional changes in levels of neurotransmitters in the brain have been identified. ? Cognitive disorder correlates with modulation of 5-HT, NA and DA neurotransmission.

  8. The effect of sulfur, magnesium, and various rates of potassium on forage production in some sandy soils of East Texas

    E-Print Network [OSTI]

    Landua, Dennis Paul

    1969-01-01T23:59:59.000Z

    in most of these soils. In a field experiment on Lakeland sand, ryegrass responded to applications of sulfur, but not to potassium or maqnesium, Soil profile analyses indicate that appli- cations of potassium caused magnesium to be displaced downward... the exchangeable potassium and magnesium in a Lakeland fine sand 4 Distribution of potassium, magnesium, and sulfate in a Lakeland fine sand. 48 Effect of fertilizer treatments on total yield of Coastal bermudagrass grown in the field in 1968. . 51 10 Effect...

  9. DOMAIN PATTERNS AND REVERSALS BY WALL MOVEMENTS OF THIN FILMS OF IRON AND NICKEL IRON

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    310 DOMAIN PATTERNS AND REVERSALS BY WALL MOVEMENTS OF THIN FILMS OF IRON AND NICKEL IRON By C. E directions but in the case of the nickel-iron film the reversal of magnetization in the perpendicular domain reversals in nickel-iron films observed by the Kerr effect, and that of Williams and Sherwood [2

  10. Ab Initio Thermodynamic Model for Magnesium Carbonates and Hydrates

    SciTech Connect (OSTI)

    Chaka, Anne M.; Felmy, Andrew R.

    2014-03-28T23:59:59.000Z

    An ab initio thermodynamic framework for predicting properties of hydrated magnesium carbonate minerals has been developed using density-functional theory linked to macroscopic thermodynamics through the experimental chemical potentials for MgO, water, and CO2. Including semiempirical dispersion via the Grimme method and small corrections to the generalized gradient approximation of Perdew, Burke, and Ernzerhof for the heat of formation yields a model with quantitative agreement for the benchmark minerals brucite, magnesite, nesquehonite, and hydromagnesite. The model shows how small differences in experimental conditions determine whether nesquehonite, hydromagnesite, or magnesite is the result of laboratory synthesis from carbonation of brucite, and what transformations are expected to occur on geological time scales. Because of the reliance on parameter-free first principles methods, the model is reliably extensible to experimental conditions not readily accessible to experiment and to any mineral composition for which the structure is known or can be hypothesized, including structures containing defects, substitutions, or transitional structures during solid state transformations induced by temperature changes or processes such as water, CO2, or O2 diffusion. Demonstrated applications of the ab initio thermodynamic framework include an independent means to evaluate differences in thermodynamic data for lansfordite, predicting the properties of Mg analogs of Ca-based hydrated carbonates monohydrocalcite and ikaite which have not been observed in nature, and an estimation of the thermodynamics of barringtonite from the stoichiometry and a single experimental observation.

  11. Good Sources of Nutrients: Iron

    E-Print Network [OSTI]

    Scott, Amanda; Replogle, Jacqueline

    2008-08-28T23:59:59.000Z

    ENP-2881 08-08 Good Sources of Nutrients Iron Buenas fuentes de nutrientes Hierro La funci?n del hierro Transporta ox?geno en la sangre para que su ? cuerpo tenga energ?a Facilita crecimiento? Proporciona energ?a que ayuda a los ni?os a ? jugar y...

  12. The viability of aluminum Zintl anion moieties within magnesium-aluminum clusters

    SciTech Connect (OSTI)

    Wang, Haopeng; Jae Ko, Yeon; Zhang, Xinxing; Gantefoer, Gerd; Bowen, Kit H., E-mail: kiran@mcneese.edu, E-mail: akandalam@wcupa.edu, E-mail: kbowen@jhu.edu [Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218 (United States); Schnoeckel, Hansgeorg [Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, 76128 Karlsruhe (Germany)] [Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, 76128 Karlsruhe (Germany); Eichhorn, Bryan W. [Department of Chemistry, University of Maryland, College Park, Maryland 20742 (United States)] [Department of Chemistry, University of Maryland, College Park, Maryland 20742 (United States); Jena, Puru [Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284 (United States)] [Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284 (United States); Kiran, Boggavarapu, E-mail: kiran@mcneese.edu, E-mail: akandalam@wcupa.edu, E-mail: kbowen@jhu.edu [Department of Chemistry, McNeese State University, Lake Charles, Louisiana 70609 (United States)] [Department of Chemistry, McNeese State University, Lake Charles, Louisiana 70609 (United States); Kandalam, Anil K., E-mail: kiran@mcneese.edu, E-mail: akandalam@wcupa.edu, E-mail: kbowen@jhu.edu [Department of Physics, West Chester University, West Chester, Pennsylvania 19383 (United States)

    2014-03-28T23:59:59.000Z

    Through a synergetic combination of anion photoelectron spectroscopy and density functional theory based calculations, we have investigated the extent to which the aluminum moieties within selected magnesium-aluminum clusters are Zintl anions. Magnesium-aluminum cluster anions were generated in a pulsed arc discharge source. After mass selection, photoelectron spectra of Mg{sub m}Al{sub n}{sup ?} (m, n = 1,6; 2,5; 2,12; and 3,11) were measured by a magnetic bottle, electron energy analyzer. Calculations on these four stoichiometries provided geometric structures and full charge analyses for the cluster anions and their neutral cluster counterparts, as well as photodetachment transition energies (stick spectra). Calculations revealed that, unlike the cases of recently reported sodium-aluminum clusters, the formation of aluminum Zintl anion moieties within magnesium-aluminum clusters was limited in most cases by weak charge transfer between the magnesium atoms and their aluminum cluster moieties. Only in cases of high magnesium content, e.g., in Mg{sub 3}Al{sub 11} and Mg{sub 2}Al{sub 12}{sup ?}, did the aluminum moieties exhibit Zintl anion-like characteristics.

  13. Influence of recycled fine aggregates on the resistance of mortars to magnesium sulfate attack

    SciTech Connect (OSTI)

    Lee, Seung-Tae [Department of Civil Engineering, Kunsan National University, 68 Miryong-dong, Kunsan, Jeonbuk 573-701 (Korea, Republic of)], E-mail: stlee@kunsan.ac.kr

    2009-08-15T23:59:59.000Z

    The influence of recycled fine aggregates, which had been reclaimed from field-demolished concretes, on the resistance of mortar specimens to magnesium sulfate attack was investigated. Mortar specimens were prepared with recycled fine aggregates at different replacement levels (0%, 25%, 50%, 75% and 100% of natural fine aggregate by mass). The mortar specimens were exposed to 4.24% magnesium sulfate solution for about 1 year at ambient temperature, and regularly monitored for visual appearance, compressive strength loss and expansion. Additionally, in order to identify products of magnesium sulfate attack, mortar samples incorporating 0%, 25% and 100% replacement levels of the recycled fine aggregates were examined by X-ray diffraction (XRD) technique. Experimental results confirmed that the use of recycled fine aggregates up to a maximum 50% replacement level is effective under severe magnesium sulfate environment, irrespective of type of recycled fine aggregates. However, the worse performance was observed in mortar specimens incorporating 100% replacement level. It was found that the water absorption of recycled fine aggregates affected deterioration of mortar specimens, especially at a higher replacement level. XRD results indicated that the main cause of deterioration of the mortar specimens was primarily due to the formation of gypsum and thaumasite by magnesium sulfate attack. In addition, it appeared that the conversion of C-S-H into M-S-H by the attack probably influenced mechanical deterioration of mortar specimens with recycled fine aggregates.

  14. Analysis of the flow imbalance on the profile shape during the extrusion of thin magnesium sheets

    SciTech Connect (OSTI)

    Gall, Sven [Forschungszentrum Strangpressen, Technische Universität Berlin, Gustav-Meyer-Allee 25, Berlin, 13355, Germany, and Metallische Werkstoffe, Technische Universität Berlin, Ernst-Reuter-Platz 1, Berlin, 10587 (Germany); Müller, Sören [Forschungszentrum Strangpressen, Technische Universität Berlin, Gustav-Meyer-Allee 25, Berlin, 13355 (Germany); Reimers, Walter [Metallische Werkstoffe, Technische Universität Berlin, Ernst-Reuter-Platz 1, Berlin, 10587 (Germany)

    2013-12-16T23:59:59.000Z

    The extrusion process facilitates the production of magnesium sheets featuring a very thin thickness as well as excellent surface properties by using a single process step only. However, the extrusion of the magnesium sheets applying not optimized process parameters, e.g. low billet temperature or/ and poorly deformable magnesium alloy, produce pronounced buckling and waving of the extruded sheets as well as a variation of accuracy in profile shape along the cross section. The present investigation focuses on the FEM-simulation of the extrusion of magnesium sheets in order to clarify the origin of the mentioned effects. The simulations identify the flow imbalance during extrusion as the main critical factor. Due to the flow imbalance after passing the die a large compression stress zone is formed causing the buckling and waving of the thin sheets. Furthermore, the simulations of the magnesium sheet extrusion reveal that the interaction of the material flow gradients along the width and along the thickness direction near the die orifice lead to the variation of the accuracy in profile shape.

  15. Structural studies of magnesium nitride fluorides by powder neutron diffraction

    SciTech Connect (OSTI)

    Brogan, Michael A. [School of Chemistry, University of Nottingham, Nottingham NG7 2RD (United Kingdom); Hughes, Robert W. [WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ (United Kingdom); Smith, Ronald I. [ISIS Pulsed Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX (United Kingdom); Gregory, Duncan H., E-mail: Duncan.Gregory@glasgow.ac.uk [WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ (United Kingdom)

    2012-01-15T23:59:59.000Z

    Samples of ternary nitride fluorides, Mg{sub 3}NF{sub 3} and Mg{sub 2}NF have been prepared by solid state reaction of Mg{sub 3}N{sub 2} and MgF{sub 2} at 1323-1423 K and investigated by powder X-ray and powder neutron diffraction techniques. Mg{sub 3}NF{sub 3} is cubic (space group: Pm3m) and has a structure related to rock-salt MgO, but with one cation site vacant. Mg{sub 2}NF is tetragonal (space group: I4{sub 1}/amd) and has an anti-LiFeO{sub 2} related structure. Both compounds are essentially ionic and form structures in which nitride and fluoride anions are crystallographically ordered. The nitride fluorides show temperature independent paramagnetic behaviour between 5 and 300 K. - Graphical abstract: Definitive structures of the ternary magnesium nitride fluorides Mg{sub 3}NF{sub 3} and the lower temperature polymorph of Mg{sub 2}NF have been determined from powder neutron diffraction data. The nitride halides are essentially ionic and exhibit weak temperature independent paramagnetic behaviour. Highlights: Black-Right-Pointing-Pointer Definitive structures of Mg{sub 3}NF{sub 3} and Mg{sub 2}NF were determined by neutron diffraction. Black-Right-Pointing-Pointer Nitride and fluoride anions are crystallographically ordered in both structures. Black-Right-Pointing-Pointer Both compounds exhibit weak, temperature independent paramagnetic behaviour. Black-Right-Pointing-Pointer The compounds are essentially ionic with ionicity increasing with F{sup -} content.

  16. Lightning arrestor connector lead magnesium niobate qualification pellet test procedures.

    SciTech Connect (OSTI)

    Tuohig, W. (Honeywell FM& T, Kansas City, MO); Mahoney, Patrick A.; Tuttle, Bruce Andrew; Wheeler, Jill Susanne

    2009-02-01T23:59:59.000Z

    Enhanced knowledge preservation for DOE DP technical component activities has recently received much attention. As part of this recent knowledge preservation effort, improved documentation of the sample preparation and electrical testing procedures for lead magnesium niobate--lead titanate (PMN/PT) qualification pellets was completed. The qualification pellets are fabricated from the same parent powders used to produce PMN/PT lightning arrestor connector (LAC) granules at HWF&T. In our report, the procedures for fired pellet surface preparation, electrode deposition, electrical testing and data recording are described. The dielectric measurements described in our report are an information only test. Technical reasons for selecting the electrode material, electrode size and geometry are presented. The electrical testing is based on measuring the dielectric constant and dissipation factor of the pellet during cooling from 280 C to 220 C. The most important data are the temperature for which the peak dielectric constant occurs (Curie Point temperature) and the peak dielectric constant magnitude. We determined that the peak dielectric constant for our procedure would be that measured at 1 kHz at the Curie Point. Both the peak dielectric constant and the Curie point parameters provide semi-quantitative information concerning the chemical and microstructural homogeneity of the parent material used for the production of PMN/PT granules for LACs. Finally, we have proposed flag limits for the dielectric data for the pellets. Specifically, if the temperature of the peak dielectric constant falls outside the range of 250 C {+-} 30 C we propose that a flag limit be imposed that will initiate communication between production agency and design agency personnel. If the peak dielectric constant measured falls outside the range 25,000 {+-} 10,000 we also propose that a flag limit be imposed.

  17. Hot coal gas desulfurization with manganese-based sorbents. Final report, September 1992--December 1994

    SciTech Connect (OSTI)

    Hepworth, M.T.; Slimane, R.B.

    1994-11-01T23:59:59.000Z

    The focus of much current work being performed by the Morgantown Energy Technology Center (METC) of the Department of Energy on hot coal-derived fuel gas desulfurization is in the use of zinc-based sorbents. METC has shown interest in formulating and testing manganese-based pellets as alternative effective sulfur sorbents in the 700 to 1200{degree}C temperature range. To substantiate the potential superiority of Mn-based pellets, a systematic approach toward the evaluation of the desulfurizing power of single-metal sorbents is developed based on thermodynamic considerations. This novel procedure considered several metal-based sorbents and singled out manganese oxide as a prime candidate sorbent capable of being utilized under a wide temperature range, irrespective of the reducing power (determined by CO{sub 2}/CO ratio) of the fuel gas. Then, the thermodynamic feasibility of using Mn-based pellets for the removal of H{sub 2}S from hot-coal derived fuel gases, and the subsequent oxidative regeneration of loaded (sulfided) pellets was established. It was concluded that MnO is the stable form of manganese for virtually all commercially available coal-derived fuel gases. In addition, the objective of reducing the H{sub 2}S concentration below 150 ppMv to satisfy the integrated gasification combined cycle system requirement was shown to be thermodynamically feasible. A novel process is developed for the manufacture of Mn-based spherical pellets which have the desired physical and chemical characteristics required.

  18. Molecular Interactions of Plutonium(VI) with Synthetic Manganese-Substituted Goethite

    E-Print Network [OSTI]

    Hu, Yung-Jin

    2011-01-01T23:59:59.000Z

    VI) with the Iron Oxide Goethite, University of California,Values for Synthetic Goethite and Pyrolusite" submitted tothe two Mn-substituted goethite minerals used in this study.

  19. Studies on the inuence of chloride ion and pH on the corrosion and electrochemical behaviour of AZ91D magnesium alloy

    E-Print Network [OSTI]

    Zhou, Wei

    alloys weigh $35% lower than their aluminium counterparts at equal stiness [1]. In addition, these alloys of cast AZ91 magnesium alloy. In AZ91, magnesium and the principal alloying element aluminium, have91D magnesium alloy R. AMBAT, N.N. AUNG and W. ZHOU School of Mechanical and Production Engineering

  20. Iron production maintenance effectiveness system

    SciTech Connect (OSTI)

    Augstman, J.J. [Dofasco Inc., Hamilton, Ontario (Canada)

    1996-12-31T23:59:59.000Z

    In 1989, an internal study in the Coke and Iron Maintenance Department identified the opportunities available to increase production, by decreasing unscheduled maintenance delays from 4.6%. A five year front loaded plan was developed, and presented to the company president. The plan required an initial investment of $1.4 million and a conservative break-even point was calculated to be 2.5 years. Due to budget restraints, it would have to be self-funded, i.e., generate additional production or savings, to pay for the program. The program began in 1991 at number 2 coke plant and the blast furnaces. This paper will describe the Iron Production Maintenance Effectiveness System (ME), which began with the mechanical and pipefitting trades.

  1. Iron speciation and its biological availability in seawater: A workshop

    SciTech Connect (OSTI)

    Wells, M.L.; Bruland, K.W.

    1995-09-08T23:59:59.000Z

    This workshop brought together marine chemists with expertise in iron chemistry and biologists with expertise in the role of iron in phytoplankton production to discuss controversies regarding the role of iron in oceanic primary productivity and global climatic change. A new paradigm for marine iron biogeochemistry was generated. The five major new items within this paradigm included (1) the nature of iron inputs to the sea, (2) chemical speciation of iron in seawater, (3) relationships between iron chemistry and marine microbial community dynamics, (4) adaptations of marine microbes to iron input, and (5) ecological and biogeochemical implications of changes in iron supply to the sea.

  2. The magnetic properties of the iron-rich, iron-nickel-zinc alloys

    E-Print Network [OSTI]

    Gupton, Paul Stephen

    1961-01-01T23:59:59.000Z

    THE MAGNETIC PROPERTIES OF THE IRON-RICH, IRON-NICKEL-ZINC ALLOYS A Thesis By Paul Stephen Gupton Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE January 1961 Major Subject Nuclear Engineering THE MAGNETIC PROPERTIES OF THE IRON-RICH, IRON-NICKEL-ZINC ALLOYS A Thesis By Paul Stephen Gupton Approved as to style and content by: (Chairman of Ittee) Head of Oepartment...

  3. Kinetics of dissolution and bio-availability of iron in amorphous siliceous iron oxides 

    E-Print Network [OSTI]

    Seaman, John C.

    1990-01-01T23:59:59.000Z

    KINETICS OF DISSOLUTION AND BIO-AVAILABILITY OF IRON IN AMORPHOUS SILICEOUS IRON OXIDES A Thesis By John C. Seaman Submitted to the Graduate College of Texas AIIM University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE December 1990 Major Subject: Soil Science KINETICS OF DISSOLUTION AND BIO-AVAILABILITY OF IRON IN AMORPHOUS SILICEOUS IRON OXIDES A Thesis By John C. Seaman Approved as to style and content by: Richard H. Loeppert (Chair of Committee...

  4. Correcting Iron Deficiencies in Grain Sorghum

    E-Print Network [OSTI]

    Livingston, Stephen; Coffman, Cloyce G.; Unruh, L. G.

    1996-02-20T23:59:59.000Z

    tial for chlorosis when grown on high- ese hybrids lack the ability to fully specif_ied and the iron should be determined by atomic absorption or a method that best indicates available iron in production f_ields. The ICAP (Inductive Coupled Argon Plasma...) method of analysis is prone to evaluate some of the iron on the clay structure as well as suspended iron. Therefore, adequate (but false) values are sometimes reported. One way to avoid this problem is to air-dry the samples instead of oven-drying them...

  5. Iron oxyhydroxide mineralization on microbial extracellular polysaccharides

    SciTech Connect (OSTI)

    Chan, Clara S.; Fakra, Sirine C.; Edwards, David C.; Emerson, David; Banfield, Jillian F.

    2010-06-22T23:59:59.000Z

    Iron biominerals can form in neutral pH microaerophilic environments where microbes both catalyze iron oxidation and create polymers that localize mineral precipitation. In order to classify the microbial polymers that influence FeOOH mineralogy, we studied the organic and mineral components of biominerals using scanning transmission X-ray microscopy (STXM), micro X-ray fluorescence ({mu}XRF) microscopy, and high-resolution transmission electron microscopy (HRTEM). We focused on iron microbial mat samples from a creek and abandoned mine; these samples are dominated by iron oxyhydroxide-coated structures with sheath, stalk, and filament morphologies. In addition, we characterized the mineralized products of an iron-oxidizing, stalk-forming bacterial culture isolated from the mine. In both natural and cultured samples, microbial polymers were found to be acidic polysaccharides with carboxyl functional groups, strongly spatially correlated with iron oxyhydroxide distribution patterns. Organic fibrils collect FeOOH and control its recrystallization, in some cases resulting in oriented crystals with high aspect ratios. The impact of polymers is particularly pronounced as the materials age. Synthesis experiments designed to mimic the biomineralization processes show that the polysaccharide carboxyl groups bind dissolved iron strongly but release it as mineralization proceeds. Our results suggest that carboxyl groups of acidic polysaccharides are produced by different microorganisms to create a wide range of iron oxyhydroxide biomineral structures. The intimate and potentially long-term association controls the crystal growth, phase, and reactivity of iron oxyhydroxide nanoparticles in natural systems.

  6. Nanostructure, Chemistry and Crystallography of Iron Nitride...

    Broader source: Energy.gov (indexed) [DOE]

    Nanostructure, Chemistry and Crystallography of Iron Nitride Magnetic Materials by Ultra-High-Resolution Electron Microscopy and Related Methods DOE 2011 Vehicle Technologies...

  7. Lithium Insertion Chemistry of Some Iron Vanadates

    E-Print Network [OSTI]

    Patoux, Sebastien; Richardson, Thomas J.

    2008-01-01T23:59:59.000Z

    in A. Nazri, G.Pistoia (Eds. ), Lithium batteries, Science &structure materials in lithium cells, for a lower limitLithium Insertion Chemistry of Some Iron Vanadates Sébastien

  8. Method for producing iron-based catalysts

    DOE Patents [OSTI]

    Farcasiu, Malvina (Pittsburgh, PA); Kaufman, Phillip B. (Library, PA); Diehl, J. Rodney (Pittsburgh, PA); Kathrein, Hendrik (McMurray, PA)

    1999-01-01T23:59:59.000Z

    A method for preparing an acid catalyst having a long shelf-life is provided comprising doping crystalline iron oxides with lattice-compatible metals and heating the now-doped oxide with halogen compounds at elevated temperatures. The invention also provides for a catalyst comprising an iron oxide particle having a predetermined lattice structure, one or more metal dopants for said iron oxide, said dopants having an ionic radius compatible with said lattice structure; and a halogen bound with the iron and the metal dopants on the surface of the particle.

  9. Lithium Insertion Chemistry of Some Iron Vanadates

    E-Print Network [OSTI]

    Patoux, Sebastien; Richardson, Thomas J.

    2008-01-01T23:59:59.000Z

    G.Pistoia (Eds. ), Lithium batteries, Science & Technology,Keywords: Lithium batteries, iron vanadates, insertionelectrode materials for lithium batteries, (mostly layered

  10. Nanostructure, Chemistry and Crystallography of Iron Nitride...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Nanostructure, Chemistry and Crystallography of Iron Nitride Magnetic Materials by Ultra-High-Resolution Electron Microscopy and Related Methods Nanostructure, Chemistry and...

  11. Role of microbial iron reduction in the dissolution of iron hydroxysulfate minerals

    E-Print Network [OSTI]

    and for radionuclides such as 226 Ra. These mineral-bound contaminants are considered immobilized under oxic conditions in mineral dissolution, releasing these bound contaminants. Reduction of structural sulfate in the ironRole of microbial iron reduction in the dissolution of iron hydroxysulfate minerals Elizabeth J. P

  12. Modeling Red Blood Cell and Iron Dynamics in Patients Undergoing Periodic EPO and Iron Treatments

    E-Print Network [OSTI]

    Modeling Red Blood Cell and Iron Dynamics in Patients Undergoing Periodic EPO and Iron Treatments H in the kidneys, that stimulates red blood cell (RBC) production. Without intervention, patients suffer from, erythrocyte, red blood cell, chronic kidney disease, dialysis, iron, neocytolysis, hepcidin, EPO, hemoglobin e

  13. Simulation of Stresses during Casting of Binary Magnesium-Aluminum Alloys

    E-Print Network [OSTI]

    Beckermann, Christoph

    Simulation of Stresses during Casting of Binary Magnesium-Aluminum Alloys M.G. POKORNY, C.A. MONROE made for aluminum alloys.[6­8] Recently, Mathier and co-workers[9,10] performed a detailed com- parison between measured and predicted forces in the mush during solidification of dilute aluminum alloys

  14. Hot cracking in tungsten inert gas welding of magnesium alloy AZ91D

    E-Print Network [OSTI]

    Zhou, Wei

    Hot cracking in tungsten inert gas welding of magnesium alloy AZ91D W. Zhou*, T. Z. Long and C. K of the plates were produced using tungsten inert gas (TIG) welding method. The TIG arc was also used to deposit welding beads on some of the thin plates. No cracking was found in the butt joints. However, hot cracking

  15. The Effect of Rare Earth Elements, Temperature and Rolling Speed on the Microstructure Evolution of Magnesium

    E-Print Network [OSTI]

    Barthelat, Francois

    of Magnesium Jie Pan¹, supervised by Mehdi Sanjari¹ and Prof. Stephen Yue¹ ¹Department of Mining and Materials and neodymium additive samples were acquired then subsequently rolled at different temperatures (300°C and 450°C of the precipitate which led to a less pinning effect. ·The neodymium samples have longer grain growth period than

  16. Solid-State Gadolinium-Magnesium Hydride Optical Switch R. Armitage

    E-Print Network [OSTI]

    -state electrochromic device. With positive polarization of the hydride electrode, the visible reflectance approaches 35 and reflecting states. Keywords: gadolinium-magnesium; electrochromic hydride; optical switching device. 2 #12;A conventional electrochromics5 . Optical switching has also been demonstrated by varying the H content

  17. The effect of cooling rate on thermophysical properties of magnesium alloys

    E-Print Network [OSTI]

    Medraj, Mamoun

    been in widespread use in the automotive industry processed mainly by casting. In designing cast automotive compo- nents, it is important to know how these alloys solidify at different cross sections magnesium and aluminum. The samples were cut and mechanically polished to remove any possible contaminated

  18. Magnesium-rich crustal compositions on Mercury: Implications for magmatism from petrologic modeling

    E-Print Network [OSTI]

    Hauck II, Steven A.

    Magnesium-rich crustal compositions on Mercury: Implications for magmatism from petrologic modeling December 2012. [1] We have conducted petrologic modeling of MESSENGER-derived compositions and analog-rich crustal compositions on Mercury: Implications for magmatism from petrologic modeling, J. Geophys. Res

  19. Electrodynamics in Iron and Steel

    E-Print Network [OSTI]

    John Paul Wallace

    2009-06-03T23:59:59.000Z

    In order to calculate the reflected EM fields at low amplitudes in iron and steel, more must be understood about the nature of long wavelength excitations in these metals. A bulk piece of iron is a very complex material with microstructure, a split band structure, magnetic domains and crystallographic textures that affect domain orientation. Probing iron and other bulk ferromagnetic materials with weak reflected and transmitted inductive low frequency fields is an easy operation to perform but the responses are difficult to interpret because of the complexity and variety of the structures affected by the fields. First starting with a simple single coil induction measurement and classical EM calculation to show the error is grossly under estimating the measured response. Extending this experiment to measuring the transmission of the induced fields allows the extraction of three dispersion curves which define these internal fields. One dispersion curve yielded an exceedingly small effective mass of 1.8 10^{-39}kg (1.3 10^{-9} m_e) for those spin waves. There is a second distinct dispersion curve more representative of the density function of a zero momentum bound state rather than a propagating wave. The third dispersion curve describes a magneto-elastic coupling to a very long wave length propagating mode. These experiments taken together display the characteristics of a high temperature Bose-Einstein like condensation that can be initiated by pumping two different states. A weak time dependent field drives the formation of coupled J=0 spin wave pairs with the reduced effective mass reflecting the increased size of the coherent state. These field can dominate induction measurements well past the Curie temperature.

  20. Formation of manganese -doped atomic layer in wurtzite GaN Meng Shi, Abhijit Chinchore, Kangkang Wang, Andrada-Oana Mandru, Yinghao Liu et al.

    E-Print Network [OSTI]

    Formation of manganese -doped atomic layer in wurtzite GaN Meng Shi, Abhijit Chinchore, Kangkang in wurtzite GaN Meng Shi, Abhijit Chinchore, Kangkang Wang, Andrada-Oana Mandru, Yinghao Liu, and Arthur R 2012) We describe the formation of a d-doped manganese layer embedded within c-plane wurtzite gallium

  1. Magnetism in bcc and fcc Fe with carbon and manganese This article has been downloaded from IOPscience. Please scroll down to see the full text article.

    E-Print Network [OSTI]

    Medvedeva, Julia E.

    Magnetism in bcc and fcc Fe with carbon and manganese This article has been downloaded from.1088/0953-8984/22/31/316002 Magnetism in bcc and fcc Fe with carbon and manganese N I Medvedeva1,2 , D Van Aken2 and J E Medvedeva3 1 functional theory calculations were performed to study the structure and magnetic properties of bcc

  2. The production of iron carbide

    SciTech Connect (OSTI)

    Anderson, K.M.; Scheel, J. [Nucor Iron Carbide, Inc., Point Lisas (Trinidad and Tobago)

    1997-12-31T23:59:59.000Z

    From start-up in 1994 to present, Nucor`s Iron Carbide plant has overcome many obstacles in achieving design production. Many of these impediments were due to flaws in equipment design. With the integration existing within the plant, limitations in any one system reduced the operating capacity of others. For this reason, as modifications were made and system capacities were increased, the need for additional modifications became apparent. Subsequently, operating practices, maintenance scheduling, employee incentives, and production objectives were continually adapted. This paper discusses equipment and design corrections and the quality issues that contributed to achieving the plant`s production capacity.

  3. Oceanographic and ecological consequences of iron localization in phytoplankton photosystems

    E-Print Network [OSTI]

    Hopkinson, Brian Matthew

    2007-01-01T23:59:59.000Z

    Y. Zhang, and K.W. Bruland. 1998. An iron limitation mosaicRue, J. Conn, and K.W. Bruland. 2002. Phytoplankton ironY. Zhang, and K.W. Bruland. 1998. An iron limitation mosaic

  4. Iron Cycling and Redox Evolution in the Precambrian

    E-Print Network [OSTI]

    Planavsky, Noah John

    2012-01-01T23:59:59.000Z

    J.C.G. , 1984. Suboxic Diagenesis in Banded Iron Formations.J.C.G. , 1984. Suboxic Diagenesis in Banded Iron Formations.J.C.G. , 1984. Suboxic diagenesis in banded iron formations.

  5. AEC Lowman Station - coal switching and magnesium-enhanced lime scrubbing to lower operating costs

    SciTech Connect (OSTI)

    Inkenhaus, W.; Babu, M.; Smith, K. [Dravo Lime Co., Pittsburgh, PA (United States); Loper, L. [Alabama Electric Coopreative, Leroy, AL (United States)

    1997-12-31T23:59:59.000Z

    AEC`s Lowman Station is located in Leroy, Alabama. There are three coal-fired boilers at this station. Unit 1 is capable of generating 85 MW without a flue gas desulfurization, FGD, system. Units 2 and 3, with a total of 516 MW output capacity, are equipped with FGD systems. The FGD plant was designed for wet limestone FGD with natural oxidation. Lowman Station burned low sulfur, 1.3 to 1.8% sulfur, coal. In January of 1996 AEC switched Units 2 and 3 from limestone to magnesium-enhanced lime FGD operation. It was determined that the plant could take advantage of the higher SO{sub 2} removal efficiency of the magnesium-enhanced lime system. Major benefits resulting from this conversion were AEC`s ability to switch to a lower cost high sulfur coal while meeting the stringent SO{sub 2} emission requirements. Power cost savings resulted from the lower liquid to gas ratio required by the magnesium-enhanced lime process. Three recirculation pumps per module were reduced to a single operating pump per module, lowering the scrubber pressure drop. Significant cost reduction in the operating costs of the ball mill was realized due to modifications made to slake lime instead of grinding limestone. Prior to switching, personnel from AEC and Dravo Lime Company ran a four week test on magnesium-enhanced lime to obtain scrubber performance data including SO{sub 2} removal efficiencies on the modules while burning a 1.8% sulfur coal. This paper discusses the plant modifications that were needed to make the switch, cost justifications due to coal switching, and AEC`s operating experiences to date. AEC and Dravo Lime Company working together as a team conducted detailed cost studies, followed by extensive field tests and implemented the plant modifications. This plant continues to operate burning higher sulfur coal with the magnesium-enhanced lime FGD system.

  6. The iron reduction ability of various rose rootstocks

    E-Print Network [OSTI]

    McDonald, Garry Vernon

    1990-01-01T23:59:59.000Z

    and day 14. . . . . . . . 3. Summation of peak iron reduction rates in the rose genotypes at day 7, and FeEDTA concentration of peak reduction. . . . . . . . . . . . . . . Page . . . . 30 . . . . 36 . . . . 38 CHAPTER I INTRODUCTION Iron nutrition..., usually as oxides. The amount of iron that is soluble in a soil is quite low compared to the total iron content, being dependent on the solubility of inorganic iron oxides. Soluble forms of inorganic iron include Fe +, Fe(OH) +, Fe(OH)g+ and Fe...

  7. Dechlorination of TCE with palladized iron

    DOE Patents [OSTI]

    Fernando, Quintus (Tucson, AZ); Muftikian, Rosy (Tucson, AZ); Korte, Nic (Grand Junction, CO)

    1997-01-01T23:59:59.000Z

    The present invention relates to various methods, such as an above-ground method and an in-ground method, of using a palladized iron bimetallic system for the dechlorination of chlorinated organic compounds from various effluents or contaminated soil containing the same. The use of palladized iron bimetallic system results in the dechlorination of the chlorinated organic compound into environmentally safe reaction products.

  8. Production of iron from metallurgical waste

    DOE Patents [OSTI]

    Hendrickson, David W; Iwasaki, Iwao

    2013-09-17T23:59:59.000Z

    A method of recovering metallic iron from iron-bearing metallurgical waste in steelmaking comprising steps of providing an iron-bearing metallurgical waste containing more than 55% by weight FeO and FeO equivalent and a particle size of at least 80% less than 10 mesh, mixing the iron-bearing metallurgical waste with a carbonaceous material to form a reducible mixture where the carbonaceous material is between 80 and 110% of the stoichiometric amount needed to reduce the iron-bearing waste to metallic iron, and as needed additions to provide a silica content between 0.8 and 8% by weight and a ratio of CaO/SiO.sub.2 between 1.4 and 1.8, forming agglomerates of the reducible mixture over a hearth material layer to protect the hearth, heating the agglomerates to a higher temperature above the melting point of iron to form nodules of metallic iron and slag material from the agglomerates by melting.

  9. Helium Migration in Iron Christ's College

    E-Print Network [OSTI]

    Cambridge, University of

    Helium Migration in Iron Y. Zhang Christ's College Department of Materials Science and Metallurgy the achievement at all. ii #12;Abstract A theoretical model of helium migration in body centred cubic (BCC)structure irons has been developed using the concept of the effective helium diffusion coeffi- cient

  10. Introduction Southern Ocean natural iron fertilization

    E-Print Network [OSTI]

    led to immediate localized phytoplankton blooms. They also have stimulated con- siderable speculation processes motivated three field programs in 2004­ 2006. The United Kingdom led the "CROZet natural iron into surface waters, recycling of nutrients, reactivity of iron, and phytoplankton physiology. This special

  11. Thermal treatment for recovery of manganese and zinc from zinc-carbon and alkaline spent batteries

    SciTech Connect (OSTI)

    Belardi, G. [Institute for Environmental Engineering and Geosciences (CNR) Area della Ricerca CNR, via Salaria km 29,300, Monterotondo, 00016 Rome (Italy); Lavecchia, R.; Medici, F. [Department of Chemical Engineering, Materials and Environment, Sapienza University of Rome, via Eudossiana 84, 00184 Rome (Italy); Piga, L., E-mail: luigi.piga@uniroma1.it [Department of Chemical Engineering, Materials and Environment, Sapienza University of Rome, via Eudossiana 84, 00184 Rome (Italy)

    2012-10-15T23:59:59.000Z

    Highlights: Black-Right-Pointing-Pointer We separated Zn from Mn in zinc-carbon and alkaline batteries after removal of Hg. Black-Right-Pointing-Pointer Almost total removal of Hg is achieved at low temperature in air. Black-Right-Pointing-Pointer Nitrogen atmosphere is needed to reduce zinc and to permit its volatilization. Black-Right-Pointing-Pointer A high grade Zn concentrate was obtained with a high recovery at 1000-1200 Degree-Sign C. Black-Right-Pointing-Pointer The grade of Mn in the residue was enhanced with complete recovery. - Abstract: The aim of this paper is the recovery of manganese and zinc from a mixture of zinc-carbon and alkaline spent batteries, containing 40.9% of Mn and 30.1% of Zn, after preliminary physical treatment followed by removal of mercury. Separation of the metals has been carried out on the basis of their different boiling points, being 357 Degree-Sign C and 906 Degree-Sign C the boiling point of mercury and zinc and 1564 Degree-Sign C the melting point of Mn{sub 2}O{sub 3}. Characterization by chemical analysis, TGA/DTA and X-ray powder diffraction of the mixture has been carried out after comminution sieving and shaking table treatment to remove the anodic collectors and most of chlorides contained in the mixture. The mixture has been roasted at various temperatures and resident times in a flow of air to set the best conditions to remove mercury that were 400 Degree-Sign C and 10 min. After that, the flow of air has been turned into a nitrogen one (inert atmosphere) and the temperatures raised, thus permitting the zinc oxide to be reduced to metallic zinc by the carbon present in the original mixture and recovered after volatilization as a high grade concentrate, while manganese was left in the residue. The recovery and the grade of the two metals, at 1000 Degree-Sign C and 30 min residence time, were 84% and 100% for zinc and 85% and 63% for manganese, respectively. The recovery of zinc increased to 99% with a grade of 97% at 1200 Degree-Sign C and 30 min residence time, while the recovery and grade of manganese were 86% and 87%, respectively, at that temperature. Moreover, the chlorinated compounds that could form by the combustion of the plastics contained in the spent batteries, are destroyed at the temperature required by the process.

  12. Synthesis and Characterization of Rare-earth-free Magnetic Manganese Bismuth Nanocrystals

    SciTech Connect (OSTI)

    Shen, Jian Q.; Cui, Huizhong; Huang, Xiaopeng; Gong, Maogang; Qin, Wei; Kirkeminde, Alec; Cui, Jun; Ren, Shenqiang

    2015-01-01T23:59:59.000Z

    Earth abundant manganese bismuth (MnBi) has long been of interest due to its large magnetocrystalline anisotropy and high energy density for advanced permanent magnet applications. However, solution synthesis of MnBi phase is challenging due to the reduction potential mismatch between Mn and Bi elements. In this study, we show a versatile MnBi synthesis method involving the metal co-reduction followed by thermal annealing. The magnetically hard MnBi crystalline phase is then exchange coupled with magnetically soft cobalt coating. Our processing approach offers a promising strategy for manufacturing rare-earth-free magnetic nanocrystals.

  13. Influence of film thickness and air exposure on the transport gap of manganese phthalocyanine

    SciTech Connect (OSTI)

    Haidu, F.; Fechner, A.; Salvan, G.; Gordan, O. D.; Fronk, M.; Zahn, D. R. T. [Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz (Germany); Lehmann, D. [Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz (Germany); INNOVENT Technology Development, D-07745 Jena (Germany); Mahns, B.; Knupfer, M. [Electronic and Optical Properties Department, IFW Dresden, D-01171 Dresden (Germany)

    2013-06-15T23:59:59.000Z

    The interface formation between manganese phthalocyanine (MnPc) and cobalt was investigated combining ultraviolet photoelectron spectroscopy and inverse photoelectron spectroscopy. The transport band gap of the MnPc increases with the film thickness up to a value of (1.2 {+-} 0.3) eV while the optical band gap as determined from spectroscopic ellipsometry amounts to 0.5 eV. The gap values are smaller compared to other phthalocyanines due to metallic Mn 3d states close to the Fermi level. The transport band gap was found to open upon air exposure as a result of the disappearance of the occupied 3d electronic states.

  14. Manganese-Aluminum-Based Magnets: Nanocrystalline t-MnAI Permanent Magnets

    SciTech Connect (OSTI)

    None

    2012-01-01T23:59:59.000Z

    REACT Project: Dartmouth is developing specialized alloys with magnetic properties superior to the rare earths used in today’s best magnets. EVs and renewable power generators typically use rare earths to turn the axles in their electric motors due to the magnetic strength of these minerals. However, rare earths are difficult and expensive to refine. Dartmouth will swap rare earths for a manganese-aluminum alloy that could demonstrate better performance and cost significantly less. The ultimate goal of this project is to develop an easily scalable process that enables the widespread use of low-cost and abundant materials for the magnets used in EVs and renewable power generators.

  15. Climate VISION: Private Sector Initiatives: Iron and Steel: Resources...

    Office of Scientific and Technical Information (OSTI)

    Industry Associations American Iron and Steel Institute For over a century, North American steel producers have worked as partners and members of the American Iron and Steel...

  16. Preparations of rare earth-iron alloys by thermite reduction

    DOE Patents [OSTI]

    Schmidt, Frederick A. (Ames, IA); Peterson, David T. (Ames, IA); Wheelock, John T. (Nevada, IA)

    1986-09-16T23:59:59.000Z

    An improved method for the preparation of high-purity rare earth-iron alloys by the aluminothermic reduction of a mixture of rare earth and iron fluorides.

  17. Morphology and Oxide Shell Structure of Iron Nanoparticles Grown...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Oxide Shell Structure of Iron Nanoparticles Grown by Sputter-Gas-Aggregation. Morphology and Oxide Shell Structure of Iron Nanoparticles Grown by Sputter-Gas-Aggregation. Abstract:...

  18. Production and Early Preservation of Lipid Biomarkers in Iron...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Production and Early Preservation of Lipid Biomarkers in Iron Hot Springs. Production and Early Preservation of Lipid Biomarkers in Iron Hot Springs. Abstract: The...

  19. Bioreduction of hematite nanoparticles by the dissimilatory iron...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    nanoparticles by the dissimilatory iron reducing bacterium Shewanella oneidensis MR-1. Bioreduction of hematite nanoparticles by the dissimilatory iron reducing bacterium...

  20. Electrochemical Studies of Packed Iron Powder Electrodes: Effects...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    of Packed Iron Powder Electrodes: Effects of Common Constituents of Natural Waters on Corrosion Electrochemical Studies of Packed Iron Powder Electrodes: Effects of Common...

  1. Microbial Reduction of Uranium under Iron- and Sulfate-reducing...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Uranium under Iron- and Sulfate-reducing Conditions: Effect of Amended Goethite on Microbial Community Microbial Reduction of Uranium under Iron- and Sulfate-reducing Conditions:...

  2. Manufacturing Energy and Carbon Footprint - Sector: Iron and...

    Broader source: Energy.gov (indexed) [DOE]

    Iron and Steel (NAICS 3311, 3312), October 2012 (MECS 2006) Manufacturing Energy and Carbon Footprint - Sector: Iron and Steel (NAICS 3311, 3312), October 2012 (MECS 2006)...

  3. Watermelon-like iron nanoparticles: Cr doping effect on magnetism...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Watermelon-like iron nanoparticles: Cr doping effect on magnetism and magnetization interaction reversal. Watermelon-like iron nanoparticles: Cr doping effect on magnetism and...

  4. Iron is the Key to Preserving Dinosaur Soft Tissue

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    the iron associated with fossil tissues, which occurred primarily as the mineral goethite. They then employed experiments to show that iron, derived from hemoglobin lysate,...

  5. Iron Cycling and Redox Evolution in the Precambrian

    E-Print Network [OSTI]

    Planavsky, Noah John

    2012-01-01T23:59:59.000Z

    aqueous ferrous iron and goethite. Earth and PlanetaryAdsorption of Phosphate on Goethite in Marine Electrolytes.aqueous ferrous iron and goethite and found an equilibrium

  6. Vehicle Technologies Office Merit Review 2015: Scale-Up of Magnesium Production by Fully Stabilized Zirconia Electrolysis

    Broader source: Energy.gov [DOE]

    Presentation given by INFINIUM, Inc. at 2015 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Office Annual Merit Review and Peer Evaluation Meeting about scale-up of magnesium...

  7. An approach to modeling the cost-strength-weight tradeoff in aluminum and magnesium extrusions for automotive applications

    E-Print Network [OSTI]

    Komander, Johann Kasper

    2009-01-01T23:59:59.000Z

    In light of volatile fuel prices and tightening emissions regulations, automobile manufacturers have been increasingly considering the use of light-weight magnesium in their efforts to improve fuel economy. While mainly ...

  8. Vehicle Technologies Office Merit Review 2014: Scale-Up of Magnesium Production by Fully Stabilized Zirconia Electrolysis

    Broader source: Energy.gov [DOE]

    Presentation given by INFINIUM, Inc. at 2014 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Office Annual Merit Review and Peer Evaluation Meeting about scale-up of magnesium...

  9. Identifying barriers to the availability and use of Magnesium Sulphate Injection in resource poor countries: A case study in Zambia

    E-Print Network [OSTI]

    Ridge, Anna L; Bero, Lisa A; Hill, Suzanne R

    2010-01-01T23:59:59.000Z

    barriers to the availability and use of Magnesium Sulphateto identify barriers to the availability and use of MgSO4 infacilitators to the availability and use of MgSO4 identified

  10. Synthesis and Structural Characterization of Magnesium Based Coordination Networks in Different Solvents

    SciTech Connect (OSTI)

    D Banerjee; J Finkelstein; A Smirnov; P Forster; L Borkowski; S Teat; J Parise

    2011-12-31T23:59:59.000Z

    Three magnesium based metal-organic frameworks, Mg{sub 3}(3,5-PDC){sub 3}(DMF){sub 3} {center_dot} DMF [1], Mg(3,5-PDC)(H{sub 2}O) {center_dot} (H{sub 2}O) [3], and Mg{sub 4}(3,5-PDC){sub 4}(DMF){sub 2}(H{sub 2}O){sub 2} {center_dot} 2DMF {center_dot} 4.5H{sub 2}O [4], and a 2-D coordination polymer, [Mg(3,5-PDC)(H{sub 2}O){sub 2}] [2] [PDC = pyridinedicarboxylate], were synthesized using a combination of DMF, methanol, ethanol, and water. Compound 1 [space group P2{sub 1}/n, a = 12.3475(5) {angstrom}, b = 11.1929(5) {angstrom}, c = 28.6734(12) {angstrom}, {beta} = 98.8160(10){sup o}, V = 3916.0(3) {angstrom}{sup 3}] consists of a combination of isolated and corner-sharing magnesium octahedra connected by the organic linkers to form a 3-D network with a 12.2 {angstrom} x 4.6 {angstrom} 1-D channel. The channel contains coordinated and free DMF molecules. In compound 2 [space group C2/c, a = 9.964(5) {angstrom}, b = 12.0694(6) {angstrom}, c = 7.2763(4) {angstrom}, {beta} = 106.4970(6){sup o}, V = 836.70(6) {angstrom}{sup 3}], PDC connects isolated seven coordinated magnesium polyhedra into a layered structure. Compound 3 [space group P6{sub 1}22, a = 11.479(1) {angstrom}, c = 14.735(3) {angstrom}, V = 1681.7(4) {angstrom}{sup 3}] (previously reported) contains isolated magnesium octahedra connected by the organic linker with each other forming a 3D network. Compound 4 [space group P2{sub 1}/c, a = 13.7442(14) {angstrom}, b = 14.2887(15) {angstrom}, c = 14.1178(14) {angstrom}, {beta} = 104.912(2){sup o}, V = 2679.2(5) {angstrom}{sup 3}] also exhibits a 3D network based on isolated magnesium octahedra with square cavities containing both disordered DMF and water molecules. The structural topologies originate due to the variable coordination ability of solvent molecules with the metal center. Water molecules coordinate with the magnesium metal centers preferably over other polar solvents (DMF, methanol, ethanol) used to synthesize the coordination networks. Despite testing multiple desolvation routes, we were unable to measure BET surface areas greater than 51.9 m{sup 2}/g for compound 1.

  11. Synthesis and Structural Characterization of Magnesium Based Coordination Networks in Different Solvents

    SciTech Connect (OSTI)

    Banerjee, Debasis; Finkelstein, Jeffrey; Smirnov, A.; Forster, Paul M.; Borkowski, Lauren A.; Teat, Simon J.; Parise, John B. (UNLV); (SUNYB); (LBNL)

    2012-10-11T23:59:59.000Z

    Three magnesium based metal-organic frameworks, Mg{sub 3}(3,5-PDC){sub 3}(DMF){sub 3} {center_dot} DMF [1], Mg(3,5-PDC)(H{sub 2}O) {center_dot} (H{sub 2}O) [3], and Mg4(3,5-PDC)4(DMF){sub 2}(H{sub 2}O){sub 2} {center_dot} 2DMF {center_dot} 4.5H{sub 2}O [4], and a 2-D coordination polymer, [Mg(3,5-PDC)(H{sub 2}O){sub 2}] [2] [PDC = pyridinedicarboxylate], were synthesized using a combination of DMF, methanol, ethanol, and water. Compound 1 [space group P2{sub 1}/n, a = 12.3475(5) {angstrom}, b = 11.1929(5) {angstrom}, c = 28.6734(12) {angstrom}, {beta} = 98.8160(10){sup o}, V = 3916.0(3) {angstrom}{sup 3}] consists of a combination of isolated and corner-sharing magnesium octahedra connected by the organic linkers to form a 3-D network with a 12.2 {angstrom} x 4.6 {angstrom} 1-D channel. The channel contains coordinated and free DMF molecules. In compound 2 [space group C2/c, a = 9.964(5) {angstrom}, b = 12.0694(6) {angstrom}, c = 7.2763(4) {angstrom}, {beta} = 106.4970(6){sup o}, V = 836.70(6) {angstrom}{sup 3}], PDC connects isolated seven coordinated magnesium polyhedra into a layered structure. Compound 3 [space group P6{sub 1}22, a = 11.479(1) {angstrom}, c = 14.735(3) {angstrom}, V = 1681.7(4) {angstrom}{sup 3}] (previously reported) contains isolated magnesium octahedra connected by the organic linker with each other forming a 3D network. Compound 4 [space group P2{sub 1}/c, a = 13.7442(14) {angstrom}, b = 14.2887(15) {angstrom}, c = 14.1178(14) {angstrom}, {beta} = 104.912(2){sup o}, V = 2679.2(5) {angstrom}{sup 3}] also exhibits a 3D network based on isolated magnesium octahedra with square cavities containing both disordered DMF and water molecules. The structural topologies originate due to the variable coordination ability of solvent molecules with the metal center. Water molecules coordinate with the magnesium metal centers preferably over other polar solvents (DMF, methanol, ethanol) used to synthesize the coordination networks. Despite testing multiple desolvation routes, we were unable to measure BET surface areas greater than 51.9 m{sup 2}/g for compound 1.

  12. 2iron-based superconductors

    SciTech Connect (OSTI)

    Bossoni, L [University of Pavia-CNISM; Romano, L [University of Parma, Parco Area dell Scienze; Canfield, Paul C [Ames Laboratory; Lascialfari, A [Universita degli Studi di Milano

    2014-10-08T23:59:59.000Z

    We measured the static uniform spin susceptibility of Ba(Fe1?xRhx)2As2 iron-based superconductors, over a broad range of doping (0.041x0.094) and magnetic fields. At small fields (H1kOe) we observed, above the transition temperature Tc, the occurrence of precursor diamagnetism, which is not ascribable to the Ginzburg–Landau theory. On the contrary, our data agree with a phase fluctuation model, which has been used to interpret a similar phenomenology occurring in the high- Tc cuprate superconductors. Additionally, in the presence of strong fields, the unconventional fluctuating diamagnetism is suppressed, whereas Ginzburg–Landau fluctuations are found, in agreement with literature.

  13. Effects of solar radiation on manganese oxide reactions with selected organic compounds

    SciTech Connect (OSTI)

    Bertino, D.J.; Zepp, R.G. (Environmental Protection Agency, Athens, GA (United States))

    1991-07-01T23:59:59.000Z

    The effects of sunlight on aqueous redox reactions between manganese oxides (MnO{sub x}) and selected organic substances are reported. No sunlight-induced rate enhancement was observed for the MnO{sub x} oxidation of substituted phenols, anisole, o-dichlorobenzene, or p-chloroaniline. On the other hand, solar radiation did accelerate the reduction of manganese oxides by dissolved organic matter (DOM) from aquatic environments. The photoreduction of MnO{sub x} by DOM was little affected by molecular oxygen in air-saturated water (250 {mu}M), but was inhibited by 2,6-dichloroindophenol (0.5-6 {mu}M), and excellent electron acceptor. MnO{sub x} reduction also was photosensitized by anthraquinone-2-sulfonate. These results indicate that the photoreduction probably involves electron transfer from excited states of sorbed DOM to the oxide surface. Wavelength studies indicated that ultraviolet-B radiation (280-320 nm) plays an important role in this photoreduction.

  14. Forms and pedogenic distribution of extractable manganese in some soils of south-western Nigeria

    SciTech Connect (OSTI)

    Ayanlaja, S.A.

    1984-01-01T23:59:59.000Z

    The contents of various forms of manganese in 10 profiles from S.W. Nigeria was determined by selective extraction methods: dithionite (total), oxalate (amorphous), hydroquinone (easily reducible) and pyrophosphate (organic). All forms were generally highest in the surface horizon and decreased down the profile. Amorphous Mn is the dominant form, being between 80-100% of the total Mn. This indicates that a high proportion of the total soil Mn is potentially available to plant. The active Mn ratio remains fairly constant through most of the profiles suggesting that a dynamic equilibrium exists between the crystalline and the amorphous forms. X-ray diffraction analysis of the manganese concretions picked out from the soils revealed birnessite as the prevalent crystalline form, and the formula derived for birnessite by chemical and thermogravimetric analyses is: (Mn/sub 6.37/, Co/sub 0.16/, Na/sub 1.52/, Ni/sub 0.03/, Ca/sub 0.02/, K/sub 0.06/, Cu/sub 0.01/, Mg/ sub 0.07/) O/sub 14/.4H/sub 2/O.

  15. Mesoporous titanium-manganese dioxide for sulphur mustard and soman decontamination

    SciTech Connect (OSTI)

    Stengl, Vaclav, E-mail: stengl@iic.cas.cz [Department of Solid State Chemistry, Institute of Inorganic Chemistry AS CR v.v.i., 250 68 Rez (Czech Republic)] [Department of Solid State Chemistry, Institute of Inorganic Chemistry AS CR v.v.i., 250 68 Rez (Czech Republic); Bludska, Jana [Department of Solid State Chemistry, Institute of Inorganic Chemistry AS CR v.v.i., 250 68 Rez (Czech Republic)] [Department of Solid State Chemistry, Institute of Inorganic Chemistry AS CR v.v.i., 250 68 Rez (Czech Republic); Oplustil, Frantisek; Nemec, Tomas [Military Technical Institute of Protection Brno, Veslarska 230, 628 00 Brno (Czech Republic)] [Military Technical Institute of Protection Brno, Veslarska 230, 628 00 Brno (Czech Republic)

    2011-11-15T23:59:59.000Z

    Highlights: {yields} New nano-dispersive materials for warfare agents decontamination. {yields} 95% decontamination activities for sulphur mustard. {yields} New materials base on titanium and manganese oxides. -- Abstract: Titanium(IV)-manganese(IV) nano-dispersed oxides were prepared by a homogeneous hydrolysis of potassium permanganate and titanium(IV) oxo-sulphate with 2-chloroacetamide. Synthesised samples were characterised using Brunauer-Emmett-Teller (BET) surface area and Barrett-Joiner-Halenda porosity (BJH), X-ray diffraction (XRD), infrared spectroscopy (IR), and scanning electron microscopy (SEM). These oxides were taken for an experimental evaluation of their reactivity with sulphur mustard (HD or bis(2-chloroethyl)sulphide) and soman (GD or (3,3'-dimethylbutan-2-yl)-methylphosphonofluoridate). Mn{sup 4+} content affects the decontamination activity; with increasing Mn{sup 4+} content the activity increases for sulphur mustard and decreases for soman. The best decontamination activities for sulphur mustard and soman were observed for samples TiMn{sub 3}7 with 18.6 wt.% Mn and TiMn{sub 5} with 2.1 wt.% Mn, respectively.

  16. The interaction of nitrogen and magnesium deficiences in certain aspects of the physiology of the cotton plant 

    E-Print Network [OSTI]

    Ghosh, Debabrata

    1961-01-01T23:59:59.000Z

    THE INTERACTION OF NITROGEN AND MAGNESIUM DEFICIENCIES IN CERTAIN ASPECTS OF THE PHYSIOLOGY OF THE COTTON PLANT A Thesis By DEBABRATA GHOSH Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partial... fulfillment of the requirements for the degree of MASTER OF SCIENCE January 1961 Major Subject: plant physiology THE INTERACTION OF NITROGEN AND MAGNESIUM DEFICIENCIES IN CERTAIN ASPECTS OF THE PHYSIOLOGY OF THE COTTON PLANT A Thesis By DEBABRATA...

  17. The determination of the bioavailability and the site of absorption in lambs fed different sources of magnesium 

    E-Print Network [OSTI]

    Hurley, Leigh Anne

    1988-01-01T23:59:59.000Z

    of the animal influences Ng avail- ability. Grace (1972) found that older cows exhibited a sharper decrease in plasma Ng than did younger cows in the early stages of lactation. Magnesium Supplementation The adequacy of dietary Mg levels is probably...THE DETERMINATION OF THE BIOAVAILABILITY AND THE SITE OF ABSORPTION IN LAMBS FED DIFFERENT SOURCES OF MAGNESIUM A Thesis I, EIGH ANNE HURLEY Submitted to the Of f ice of Graduate Studies Texas AAM UniversitY in partial fulfillment...

  18. Ash, calcium, phosphorus and magnesium content of the metacarpus of hereford cows under different nutritional and physiological conditions 

    E-Print Network [OSTI]

    Haque, Mozammel

    1967-01-01T23:59:59.000Z

    ASH, CALCIUM, PHOSPHORUS AND MAGNESIUM CONTENT OF THE METACARPUS OF HEREFORD COWS UNDER DIFFERENT NUTRITIONAL AND PHYSIOLOGICAL CONDITIONS A Thesis By MOZAMMEL HAQUE Submitted to the Graduate College of the Texas A&M University in partial... centages of Calcium, Phosphorus snd Magnesium in Bone Ash for Cows Gi;en Different Treatments During Pre- And Post-Partum Periods 22 10 Analysis of Variance oi Calcium in Bone Ash Dun an's )tultiple tvange Test 1'or Calcium in Bone Ash. Analy...

  19. The effects of a suboptimal intake of magnesium with soy protein concentrate on parturition, growth, and viability in the rat 

    E-Print Network [OSTI]

    Carson, Sonja D'Awn

    1985-01-01T23:59:59.000Z

    % casein or 20% soy concentrate as the protein source, and supplemented with 700 ppm, 650 ppm, 75 ppm or 0 ppm magnesium. The experiment was conducted from growth throughout lactation. Maternal performance postpartum was adversely affected by sub... prompted research of soy products (23). Few have reported on the effects of feeding rats a suboptimal level of magnesium in a diet based on casein or soy protein concentrate from weanling through gestation and lactation. The objectives of this study...

  20. The effect of sulfur, magnesium, and various rates of potassium on forage production in some sandy soils of East Texas 

    E-Print Network [OSTI]

    Landua, Dennis Paul

    1969-01-01T23:59:59.000Z

    THE EFFECT OF SULFUR, MAGNESIUM, AND VARIOUS RATES OF POTASSIUM ON FORAGE PRODUCTION IN SOME SANDy SOILS OF EAST TEXAS A Thesis by DENNIS PAUL LANDUA Submitted to the Graduate Collccje of Texas AFM Unive, sity in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE Ma 1969 Major Subject Soil Chemistr THE EFFECT OF SULFUR, MAGNESIUM, AND VARIOUS RATES OF POTASSIUM ON FORAGE PRODUCTION IN SOME SANDY SOILS OF EAST TEXAS A Thesis by DENNIS PAUL LANDUA Approved...

  1. Dechlorination of TCE with palladized iron

    DOE Patents [OSTI]

    Fernando, Q.; Muftikian, R.; Korte, N.

    1997-03-18T23:59:59.000Z

    The present invention relates to various methods, such as an above-ground method and an in-ground method, of using a palladized iron bimetallic system for the dechlorination of chlorinated organic compounds from effluents containing the same. The use of palladized iron bimetallic system results in the dechlorination of the chlorinated organic compound into environmentally safe reaction products. The present invention also provides kits, devices, and other instruments that use the above-mentioned palladized iron bimetallic system for the dechlorination of chlorinated organic compounds. 10 figs.

  2. Dechlorination of TCE with palladized iron

    DOE Patents [OSTI]

    Fernando, Q.; Muftikian, R.; Korte, N.

    1998-06-02T23:59:59.000Z

    The present invention relates to various methods, such as an above-ground method and an in-ground method, of using a palladized iron bimetallic system for the dechlorination of chlorinated organic compounds from effluents containing the same. The use of palladized iron bimetallic system results in the dechlorination of the chlorinated organic compound into environmentally safe reaction products. The present invention also provides kits, devices, and other instruments that use the above-mentioned palladized iron bimetallic system for the dechlorination of chlorinated organic compounds. 10 figs.

  3. Composition and Flow Behavior of F-Canyon Tank 804 Sludge following Manganese Addition and pH Adjustment

    SciTech Connect (OSTI)

    Poirier, M. R.; Stallings, M. E.; Burket, P.R.; Fink, S. D.

    2005-11-30T23:59:59.000Z

    The Site Deactivation and Decommissioning (SDD) Organization is evaluating options to disposition the 800 underground tanks (including removal of the sludge heels from these tanks). To support this effort, SDD requested assistance from Savannah River National Laboratory (SRNL) personnel to examine the composition and flow characteristics of the Tank 804 sludge slurry after diluting it 10:1 with water, adding manganese nitrate to produce a slurry containing 5.5 wt % manganese (40:1 ratio of Mn:Pu), and adding sufficient 8 M caustic to raise the pH to 7, 10, and 14. Researchers prepared slurries containing one part Tank 804 sludge and 10 parts water. The water contained 5.5 wt % manganese (which SDD will add to poison the plutonium in Tank 804) and was pH adjusted to 3, 7, 10, or 14. They hand mixed (i.e., shook) these slurries and allowed them to sit overnight. With the pH 3, 7, and 10 slurries, much of the sludge remained stuck to the container wall. With the pH 14 slurry, most of the sludge appeared to be suspended in the slurry. They collected samples from the top and bottom of each container, which were analyzed for plutonium, manganese, and organic constituents. Following sampling, they placed the remaining material into a viscometer and measured the relationship between applied shear stress and shear rate. The pH 14 slurry was placed in a spiral ''race track'' apparatus and allowed to gravity drain.

  4. ENVR Dionysios Dionysiou Wednesday, August 22, 2012 261 -Arsenic mobilization in the critical zone: Oxidation by manganese oxide minerals

    E-Print Network [OSTI]

    Sparks, Donald L.

    : Oxidation by manganese oxide minerals Jason S. Fischel1, fischelj@udel.edu, Matthew H. Fischel1, Brandon J, biogenic and abiotic. Five Mn oxide minerals were reacted under identical conditions with equal reactivity, due to passivation. Understanding the reactivity of naturally occurring Mn oxide minerals

  5. Defining manganese(II) removal processes in passive coal mine drainage treatment systems through laboratory incubation experiments

    E-Print Network [OSTI]

    Burgos, William

    - trations. At operating coal mines, the most commonly used ``active treatment'' method to remove MnDefining manganese(II) removal processes in passive coal mine drainage treatment systems through for the passive removal of Mn(II) from coal mine drainage (CMD). Aqueous Mn(II) is removed via oxidative

  6. Electronic transport in Lithium Nickel Manganese Oxide, a high-voltage cathode material for Lithium-Ion batteries

    E-Print Network [OSTI]

    Ransil, Alan Patrick Adams

    2013-01-01T23:59:59.000Z

    Potential routes by which the energy densities of lithium-ion batteries may be improved abound. However, the introduction of Lithium Nickel Manganese Oxide (LixNi1i/2Mn3/2O4, or LNMO) as a positive electrode material appears ...

  7. Selective adsorption of manganese onto cobalt for optimized Mn/Co/TiO2 FischerTropsch catalysts

    E-Print Network [OSTI]

    Regalbuto, John R.

    Selective adsorption of manganese onto cobalt for optimized Mn/Co/TiO2 Fischer­Tropsch catalysts promotion Fischer­Tropsch Strong Electrostatic Adsorption a b s t r a c t The Strong Electrostatic Adsorption (SEA) method was applied to the rational design of a promoted Co catalyst for Fischer­Tropsch (FT

  8. Sol-gel preparation of lead magnesium niobate (PMN) powders and thin films

    DOE Patents [OSTI]

    Boyle, T.J.

    1999-01-12T23:59:59.000Z

    A method of preparing a lead magnesium niobium oxide (PMN), Pb(Mg{sub 1/3}Nb{sub 2/3})O{sub 3}, precursor solution by a solvent method wherein a liquid solution of a lead-complex PMN precursor is combined with a liquid solution of a niobium-complex PMN precursor, the combined lead- and niobium-complex liquid solutions are reacted with a magnesium-alkyl solution, forming a PMN precursor solution and a lead-based precipitate, and the precipitate is separated from the reacted liquid PMN precursor solution to form a precipitate-free PMN precursor solution. This precursor solution can be processed to form both ferroelectric powders and thin films. 3 figs.

  9. Sol-Gel Preparation Of Lead Magnesium Ni Obate (Pmn) Powdersand Thin Films

    DOE Patents [OSTI]

    Boyle, Timothy J. (Albuquerque, NM)

    1999-01-12T23:59:59.000Z

    A method of preparing a lead magnesium niobium oxide (PMN), Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3, precursor solution by a solvent method wherein a liquid solution of a lead-complex PMN precursor is combined with a liquid solution of a niobium-complex PMN precursor, the combined lead- and niobium-complex liquid solutions are reacted with a magnesium-alkyl solution, forming a PMN precursor solution and a lead-based precipitate, and the precipitate is separated from the reacted liquid PMN precursor solution to form a precipitate-free PMN precursor solution. This precursor solution can be processed to form both ferroelectric powders and thin films.

  10. Honeywell Modular Automation System Computer Software Documentation for the Magnesium Hydroxide Precipitation Process

    SciTech Connect (OSTI)

    STUBBS, A.M.

    2001-02-01T23:59:59.000Z

    The purpose of this Computer Software Document (CSWD) is to provide configuration control of the Honeywell Modular Automation System (MAS) in use at the Plutonium Finishing Plant (PFP) for the Magnesium Hydroxide Precipitation Process in Rm 23OC/234-52. This CSWD describes hardware and PFP/FFS developed software for control of Magnesium Hydroxide Precipitation process located in room 230, 234-52. The Honeywell and Plant Scape software generate limited configuration reports for the developed control software. These reports are described in the following section and are attached as addendum's. This plan applies to PFP Engineering Manager, Thermal Stabilization Cognizant Engineers, Solutions Stabilization Engineers, and the Shift Technical Advisors responsible for the Honeywell MAS software/hardware and administration of the Honeywell System.

  11. Yield Asymmetry Design of Magnesium Alloys by Integrated Computational Materials Engineering

    SciTech Connect (OSTI)

    Li, Dongsheng; Joshi, Vineet V.; Lavender, Curt A.; Khaleel, Mohammad A.; Ahzi, Said

    2013-11-01T23:59:59.000Z

    Deformation asymmetry of magnesium alloys is an important factor on machine design in automobile industry. Represented by the ratio of compressive yield stress (CYS) against tensile yield stress (TYS), deformation asymmetry is strongly related to microstructure, characterized by texture and grain size. Modified intermediate phi-model, a polycrystalline viscoplasticity model, is used to predict the deformation behavior of magnesium alloys with different grain sizes. Validated with experimental results, integrated computational materials engineering is applied to find out the route in achieving desired asymmetry by thermomechanical processing. In some texture, for example, rolled texture, CYS/TYS is smaller than 1 under different loading directions. In some texture, for example, extruded texture, asymmetry is large along normal direction. Starting from rolled texture, the asymmetry will increased to close to 1 along rolling direction after compressed to a strain of 0.2. Our model shows that grain refinement increases CYS/TYS. Besides texture control, grain refinement can also optimize the yield asymmetry. After the grain size decreased to a critical value, CYS/TYS reaches to 1 since CYS increases much faster than TYS. By tailoring the microstructure using texture control and grain refinement, it is achievable to optimize yield asymmetry in wrought magnesium alloys.

  12. Process for CO.sub.2 capture using a regenerable magnesium hydroxide sorbent

    DOE Patents [OSTI]

    Siriwardane, Ranjani V; Stevens, Jr., Robert W

    2013-06-25T23:59:59.000Z

    A process for CO.sub.2 separation using a regenerable Mg(OH).sub.2 sorbent. The process absorbs CO.sub.2 through the formation of MgCO.sub.3 and releases water product H.sub.2O. The MgCO.sub.3 is partially regenerated through direct contact with steam, which acts to heat the magnesium carbonate to a higher temperature, provide heat duty required to decompose the magnesium carbonate to yield MgO and CO.sub.2, provide an H.sub.2O environment over the magnesium carbonate thereby shifting the equilibrium and increasing the potential for CO.sub.2 desorption, and supply H.sub.2O for rehydroxylation of a portion of the MgO. The mixture is polished in the absence of CO.sub.2 using water product H.sub.2O produced during the CO.sub.2 absorption to maintain sorbent capture capacity. The sorbent now comprised substantially of Mg(OH).sub.2 is then available for further CO.sub.2 absorption duty in a cyclic process.

  13. MOSSBAUER STUDIES ON THE STATE OF TIN ATOMS SEGREGATED AT THE GRAIN BOUNDARY OF IRON AND IRON ALLOYS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    MOSSBAUER STUDIES ON THE STATE OF TIN ATOMS SEGREGATED AT THE GRAIN BOUNDARY OF IRON AND IRON iron and iron alloys is investigated by Mossbauer source experiments. It is found that the electronic. The Mossbauer effect should be potentially a powerful technique to investigate the binding state of individual

  14. Thermal transport properties of grey cast irons

    SciTech Connect (OSTI)

    Hecht, R.L. [Ford Motor Co., Dearborn, MI (United States). Ford Research Lab.; Dinwiddie, R.B.; Porter, W.D.; Wang, Hsin [Oak Ridge National Lab., TN (United States)

    1996-10-01T23:59:59.000Z

    Thermal diffusivity and thermal conductivity of grey cast iron have been measured as a function of graphite flake morphology, chemical composition, and position in a finished brake rotor. Cast iron samples used for this investigation were cut from ``step block`` castings designed to produce iron with different graphite flake morphologies resulting from different cooling rates. Samples were also machined from prototype alloys and from production brake rotors representing a variation in foundry practice. Thermal diffusivity was measured at room and elevated temperatures via the flash technique. Heat capacity of selected samples was measured with differential scanning calorimetry, and these results were used to calculate the thermal conductivity. Microstructure of the various cast iron samples was quantified by standard metallography and image analysis, and the chemical compositions were determined by optical emission spectroscopy.

  15. System and method for producing metallic iron

    DOE Patents [OSTI]

    Englund, David J.; Schlichting, Mark; Meehan, John; Crouch, Jeremiah; Wilson, Logan

    2014-07-29T23:59:59.000Z

    A method of production of metallic iron nodules comprises assembling a hearth furnace having a moveable hearth comprising refractory material and having a conversion zone and a fusion zone, providing a hearth material layer comprising carbonaceous material on the refractory material, providing a layer of reducible material comprising and iron bearing material arranged in discrete portions over at least a portion of the hearth material layer, delivering oxygen gas into the hearth furnace to a ratio of at least 0.8:1 ponds of oxygen to pounds of iron in the reducible material to heat the conversion zone to a temperature sufficient to at least partially reduce the reducible material and to heat the fusion zone to a temperature sufficient to at least partially reduce the reducible material, and heating the reducible material to form one or more metallic iron nodules and slag.

  16. Iron and the ecology of marine microbes

    E-Print Network [OSTI]

    Ventouras, Laure-Anne

    2013-01-01T23:59:59.000Z

    Iron is a cofactor of a number biochemical reactions that are essential for life. In the marine environment, this micronutrient is a scarce resource that limits processes of global importance such as photosynthesis and ...

  17. Dechlorination of TCE with palladized iron

    DOE Patents [OSTI]

    Fernando, Q.; Muftikian, R.; Korte, N.

    1997-04-01T23:59:59.000Z

    The present invention relates to various methods, such as an above-ground method and an in-ground method, of using a palladized iron bimetallic system for the dechlorination of chlorinated organic compounds from various effluents or contaminated soil containing the same. The use of palladized iron bimetallic system results in the dechlorination of the chlorinated organic compound into environmentally safe reaction products. 10 figs.

  18. Structure analysis of aluminium silicon manganese nitride precipitates formed in grain-oriented electrical steels

    SciTech Connect (OSTI)

    Bernier, Nicolas, E-mail: n.bernier@yahoo.fr [OCAS N.V., ArcelorMittal Global R and D Gent, Pres. J.F. Kennedylaan 3, 9060 Zelzate (Belgium); Xhoffer, Chris [OCAS N.V., ArcelorMittal Global R and D Gent, Pres. J.F. Kennedylaan 3, 9060 Zelzate (Belgium); Van De Putte, Tom, E-mail: tom.vandeputte@arcelormittal.com [OCAS N.V., ArcelorMittal Global R and D Gent, Pres. J.F. Kennedylaan 3, 9060 Zelzate (Belgium); Galceran, Montserrat [Université Libre de Bruxelles, 4MAT (Materials Engineering, Characterization, Synthesis and Recycling), Avenue F.D. Roosevelt 50, 1050 Brussels (Belgium); CIC Energigune, Albert Einstein 48, 01510 Miñano (Álava) (Spain); Godet, Stéphane [Université Libre de Bruxelles, 4MAT (Materials Engineering, Characterization, Synthesis and Recycling), Avenue F.D. Roosevelt 50, 1050 Brussels (Belgium)

    2013-12-15T23:59:59.000Z

    We report a detailed structural and chemical characterisation of aluminium silicon manganese nitrides that act as grain growth inhibitors in industrially processed grain-oriented (GO) electrical steels. The compounds are characterised using energy dispersive X-ray spectrometry (EDX) and energy filtered transmission electron microscopy (EFTEM), while their crystal structures are analysed using X-ray diffraction (XRD) and TEM in electron diffraction (ED), dark-field, high-resolution and automated crystallographic orientation mapping (ACOM) modes. The chemical bonding character is determined using electron energy loss spectroscopy (EELS). Despite the wide variation in composition, all the precipitates exhibit a hexagonal close-packed (h.c.p.) crystal structure and lattice parameters of aluminium nitride. The EDX measurement of ? 900 stoichiometrically different precipitates indicates intermediate structures between pure aluminium nitride and pure silicon manganese nitride, with a constant Si/Mn atomic ratio of ? 4. It is demonstrated that aluminium and silicon are interchangeably precipitated with the same local arrangement, while both Mn{sup 2+} and Mn{sup 3+} are incorporated in the h.c.p. silicon nitride interstitial sites. The oxidation of the silicon manganese nitrides most likely originates from the incorporation of oxygen during the decarburisation annealing process, thus creating extended planar defects such as stacking faults and inversion domain boundaries. The chemical composition of the inhibitors may be written as (AlN){sub x}(SiMn{sub 0.25}N{sub y}O{sub z}){sub 1?x} with x ranging from 0 to 1. - Highlights: • We study the structure of (Al,Si,Mn)N inhibitors in grain oriented electrical steels. • Inhibitors have the hexagonal close-packed symmetry with lattice parameters of AlN. • Inhibitors are intermediate structures between pure AlN and (Si,Mn)N with Si/Mn ? 4. • Al and Si share the same local arrangement; Mn is incorporated in both Mn{sup 2+} and Mn{sup 3+}. • Oxygen incorporation is invoked to account for the thermal stability of (Al,Si,Mn)N.

  19. Fabrication of Chemically Doped, High Upper Critical Field Magnesium Diboride Superconducting Wires

    SciTech Connect (OSTI)

    Marzik, James, V.

    2005-10-13T23:59:59.000Z

    Controlled chemical doping of magnesium diboride (MgB2) has been shown to substantially improve its superconducting properties to the levels required for high field magnets, but the doping is difficult to accomplish through the usual route of solid state reaction and diffusion. Further, superconducting cables of MgB2 are difficult to fabricate because of the friable nature of the material. In this Phase I STTR project, doped and undoped boron fibers were made by chemical vapor deposition (CVD). Several >100m long batches of doped and undoped fiber were made by CVD codeposition of boron plus dopants. Bundles of these fibers infiltrated with liquid magnesium and subsequently converted to MgB2 to form Mg-MgB2 metal matrix composites. In a parallel path, doped boron nano-sized powder was produced by a plasma synthesis technique, reacted with magnesium to produce doped MgB2 superconducting ceramic bodies. The doped powder was also fabricated into superconducting wires several meters long. The doped boron fibers and powders made in this program were fabricated into fiber-metal composites and powder-metal composites by a liquid metal infiltration technique. The kinetics of the reaction between boron fiber and magnesium metal was investigated in fiber-metal composites. It was found that the presence of dopants had significantly slowed the reaction between magnesium and boron. The superconducting properties were measured for MgB2 fibers and MgB2 powders made by liquid metal infiltration. Properties of MgB2 products (Jc, Hc2) from Phase I are among the highest reported to date for MgB2 bulk superconductors. Chemically doped MgB2 superconducting magnets can perform at least as well as NbTi and NbSn3 in high magnetic fields and still offer an improvement over the latter two in terms of operating temperature. These characteristics make doped MgB2 an effective material for high magnetic field applications, such as magnetic confined fusion, and medical MRI devices. Developing fusion as an energy source will dramatically reduce energy costs, global warming, and radioactive waste. Cheaper and more efficient medical MRI devices could lower examination costs, find potential health problems earlier, and thus also benefit society as a whole. Other potential commercial applications for this material are devices for the generation and storage of electrical power, thus lowering the cost of delivered electricity.

  20. Marine Conservation Science and Policy Service learning Program

    E-Print Network [OSTI]

    Miami, University of

    for minerals, including salt, sand, gravel, manganese, copper, nickel, and iron, and drilled for crude oil

  1. Nano-sized Lithium Manganese Oxide Dispersed on Carbon Nanotubes for Energy Storage Applications

    SciTech Connect (OSTI)

    Bak, S.B.

    2009-08-01T23:59:59.000Z

    Nano-sized lithium manganese oxide (LMO) dispersed on carbon nanotubes (CNT) has been synthesized successfully via a microwave-assisted hydrothermal reaction at 200 C for 30 min using MnO{sub 2}-coated CNT and an aqueous LiOH solution. The initial specific capacity is 99.4 mAh/g at a 1.6 C-rate, and is maintained at 99.1 mAh/g even at a 16 C-rate. The initial specific capacity is also maintained up to the 50th cycle to give 97% capacity retention. The LMO/CNT nanocomposite shows excellent power performance and good structural reversibility as an electrode material in energy storage systems, such as lithium-ion batteries and electrochemical capacitors. This synthetic strategy opens a new avenue for the effective and facile synthesis of lithium transition metal oxide/CNT nanocomposite.

  2. Investigation of the release of Si from SiO{sub 2} during the formation of manganese/ruthenium barrier layers

    SciTech Connect (OSTI)

    McCoy, A. P.; Casey, P.; Bogan, J.; Byrne, C.; Hughes, G. [School of Physical Sciences, Dublin City University, Dublin 9 (Ireland)] [School of Physical Sciences, Dublin City University, Dublin 9 (Ireland)

    2013-05-20T23:59:59.000Z

    The thermodynamic and structural stability of ruthenium-manganese diffusion barriers on SiO{sub 2} is assessed. A {approx}2 nm film composed of partially oxidized manganese (MnO{sub x} where x < 1) was deposited on a 3 nm thick Ru film and the Mn-MnO{sub x}/Ru/SiO{sub 2} structure was subsequently thermally annealed. X-ray photoelectron spectroscopy and secondary ion mass spectroscopy studies suggest the release and upward diffusion of Si from the dielectric substrate as a result of manganese-silicate formation at the Ru/SiO{sub 2} interface. The migration of Si up through the Ru film results in further manganese-silicate formation upon its interaction with the Mn-MnO{sub x} deposited layer.

  3. Effect of different intravenous iron preparations on lymphocyte intracellular reactive oxygen species generation and subpopulation survival.

    E-Print Network [OSTI]

    Gupta, Ajay; Zhuo, Jiaying; Zha, Junli; Reddy, Srinivasa; Olp, Jonathan; Pai, Amy

    2010-01-01T23:59:59.000Z

    IV iron compounds induced greater intracellular ROS generation,IV iron preparations on intracellular reactive oxygen species generationIV iron preparations on intracellular immune cell ROS generation

  4. Iron availability limits the ocean nitrogen inventory stabilizing feedbacks between marine denitrification and nitrogen fixation

    E-Print Network [OSTI]

    Moore, J. Keith; Doney, Scott C

    2007-01-01T23:59:59.000Z

    Falkowski (2001), Iron availability, cellular iron quotas,C. Doney (2007), Iron availability limits the ocean nitrogentemperature, P and Fe availability. Diazotrophs have higher

  5. Iron speciation in urban dust

    SciTech Connect (OSTI)

    Elzinga, E.J.; Fitts, J.; Gao, Y.; Tappero, R.

    2011-08-01T23:59:59.000Z

    An improved understanding of anthropogenic impacts on ocean fertility requires knowledge of anthropogenic dust mineralogy and associated Fe speciation as a critical step toward developing Fe solubility models constrained by mineralogical composition. This study explored the utility of micro-focused X-ray absorption spectroscopy ({mu}-XAS) in characterizing the speciation of Fe in urban dust samples. A micro-focused beam of 10 x 7 {mu}m made possible the measurement of the Fe K edge XAS spectra of individual dust particles in the PM5.6 size fraction collected in Newark, New Jersey, USA. Spectral analysis indicated the presence of mixtures of Fe-containing minerals within individual dust particles; we observed significant magnetite content along with other Fe(III)-(hydr)oxide minerals which could not be conclusively identified. Our data indicate that detailed quantitative determination of Fe speciation requires extended energy scans to constrain the types and relative abundance of Fe species present. We observe heterogeneity in Fe speciation at the dust particle level, which underscores the importance of analyzing a statistically adequate number of particles within each dust sample. Where possible, {mu}-XAS measurements should be complemented with additional characterization techniques such as {mu}-XRD and bulk XAS to obtain a comprehensive picture of the Fe speciation in dust materials. X-ray microprobes should be used to complement bulk methods used to determine particle composition, methods that fail to record particle heterogeneity. Keywords - Urban dust; Iron; Speciation; Micro-focused X-ray absorption spectroscopy.

  6. Electronic structure of the dioxygen to transition metal bond: generalized molecular orbital calculations on models of manganese, iron, and cobalt porphyrins

    E-Print Network [OSTI]

    Newton, James Edward

    1982-01-01T23:59:59.000Z

    are reported for FeP where P = porphinato(2-) ~ (NH2)4 , (NHCH2)4 , (N4C2H10) , (N4CBH6) and for Fe(02)PL where P = porphi nato(2-), (NH2)4 , (N4C2H6) and L = imidazole, NH3. The MO calculations indicate that (N4C2H6) is a better model for the porphyri n... ring in metal-dioxygen porphyrin complexes than the model (NH ) . This model was employed in generalized molecular orbital-confi guration interaction calculations of Fe(02)P(NH3), Co(02)P(NH3), and Mn(02)P where P = (N4C2H6) The ozone...

  7. Iron, Manganese and Ruthenium Metal Carbonyls as Photoactive Carbon Monoxide Releasing Molecules (photoCORMS): Ligand Design Strategies, Syntheses and Structure Characterizations

    E-Print Network [OSTI]

    Gonzales, Margarita Andal

    2013-01-01T23:59:59.000Z

    15 , components of dye-sensitized solar cells 16 and ion-components in dye-sensitized solar cells. 2-4 When carbon

  8. Iron, Manganese and Ruthenium Metal Carbonyls as Photoactive Carbon Monoxide Releasing Molecules (photoCORMS): Ligand Design Strategies, Syntheses and Structure Characterizations

    E-Print Network [OSTI]

    Gonzales, Margarita Andal

    2013-01-01T23:59:59.000Z

    L = SBPy 3 , Tpmen [(L)Fe(CO)] n+ [(L)Fe(Solv)] n+ + CO (Eq.1b) Solvent (Solv) MeCN, DMF, H 2 O The stronger tendency ofCl,Cl)- [Ru(Cl) 2 (CO)(solv)(bpy)] adduct. With prolonged

  9. THE INFLUENCE OF LIGAND PARAMETERS ON THE PHOTOLABILITY OF NITRIC OXIDE FROM DESIGNED IRON, MANGANESE, AND RUTHENIUM NITROSYLS UNDER VISIBLE LIGHT

    E-Print Network [OSTI]

    Fry, Nicole L.

    2012-01-01T23:59:59.000Z

    typically exhibits a low-energy (L)Ru-NO + h? + solv ? (L)Ru(III)-solv + NO • absorption band in its electronicin The [(L)Ru(III)(FlEt)(solv)] (L = Me 2 bpb or (OMe) 2

  10. Relationships between chemical forms of soil iron and manganese and their absorption by rice from 34 flooded Gulf Coast soils of Texas

    E-Print Network [OSTI]

    Phillips, Douglas Patton

    1971-01-01T23:59:59.000Z

    measure of the level of reduction of a system. It is given by the electrical potential where an inert electrode, such as platinum or gold, comes in contact with the system (15, 47) . The reduction potential of a system of the type, Oxidant + ne... climatic conditions. All soils were slightly acid to acid with the exception of soil 20. It has been shown that the pH of acid soils increases to approximately neutrality upon constant submergence (41). Soil texture ranged from sandy loam to clay. Most...

  11. Electronic structure of the dioxygen to transition metal bond: generalized molecular orbital calculations on models of manganese, iron, and cobalt porphyrins 

    E-Print Network [OSTI]

    Newton, James Edward

    1982-01-01T23:59:59.000Z

    calculat1on y1elded a I ground. state conf1gurat1on in which the bonding orbital has an occu- pation number of 1. 97 and the antibond1ng orbital has an occupat1on number of 0. 03 electrons. Both Pauling and Griffith geometr1es of Nn(0 )(H C H ) y1... Geometries. Basis sets. . Results Fenske-Hall molecular orbi tal calculations. Restricted Hartree-Fock-Roothaan-Configuration Interaction calculations. 56 58 59 ~ ~ 59 ~ ~ 61 62 62 65 Generalized Molecular Orbi tal-Conf i gurati on Interaction...

  12. Effects of iron and manganese in culture solution on their concentrations in roots and shoots of rice plants (Oryza sativa L.) grown under anaerobic conditions

    E-Print Network [OSTI]

    Bacha, Richard E

    1976-01-01T23:59:59.000Z

    into pots containing sand with varying Fe and Mn concentrations which were established by the addition of soluble Fe and Mn salts. Solution concentrations of Fe and Mn were monitored through a 30-day growth period of the plants. Solution concentrations... of Fe varied from 0. 5 to 50. 5 ppm; whereas Mn concen- trations ranged from 0. 1 to 12. 5 ppm. Variations in solution concen- trations of Fe and Mn over time were obtained. Initial high concentrations (50. 5 ppm Fe and 12. 5 ppm Mn) in solution...

  13. Iron, Manganese and Ruthenium Metal Carbonyls as Photoactive Carbon Monoxide Releasing Molecules (photoCORMS): Ligand Design Strategies, Syntheses and Structure Characterizations

    E-Print Network [OSTI]

    Gonzales, Margarita Andal

    2013-01-01T23:59:59.000Z

    is due to the bound acetonitrile ligands. Figure 3.II.21. IR2 (qmtpm)(PPh 3 )]ClO 4 in acetonitrile xi Figure 3.II.7.CO) 2 (qmtpm)]ClO 4 in acetonitrile Figure 3.II.8. Changes

  14. Catalytic iron oxide for lime regeneration in carbonaceous fuel combustion

    SciTech Connect (OSTI)

    Shen, M.; Yang, R.T.

    1980-09-30T23:59:59.000Z

    Lime utilization for sulfurous oxides absorption in fluidized combustion of carbonaceous fuels is improved by impregnation of porous lime particulates with iron oxide. The impregnation is achieved by spraying an aqueous solution of mixed iron sulfate and sulfite on the limestone before transfer to the fluidized bed combustor, whereby the iron compounds react with the limestone substrate to form iron oxide at the limestone surface. It is found that iron oxide present in the spent limestone acts as a catalyst to regenerate the spent limestone in a reducing environment. With only small quantities of iron oxide the calcium can be recycled at a significantly increased rate.

  15. Magnesium cage shows promise for carbon capture http://www.rsc.org/chemistryworld/News/2009/December/01120901.asp[12/2/2009 12:27:18 PM

    E-Print Network [OSTI]

    Yaghi, Omar M.

    Magnesium cage shows promise for carbon capture http://www.rsc.org/chemistryworld/News/2009 Links Tools Magnesium cage shows promise for carbon capture 01 December 2009 US chemists have shown and selectively capture carbon dioxide from a mixture of gases and subsequently release it using little energy

  16. JOURNAL DE PHYSIQUE Colloque C1, suppliment au no 4, Tome 38, Avril 1977, page C1-207 KINETICS OF THE CATION REDISTRIBUTION IN MAGNESIUM FERRITES

    E-Print Network [OSTI]

    Boyer, Edmond

    OF THE CATION REDISTRIBUTION IN MAGNESIUM FERRITES V. A. M. BRABERS and J. KLERK Department of Physics distribution des ions Mg2+et Fe3+sur les sites tetrakdriques et octakdriquesde ferrites de magnesium est Ctudi octahedral and tetrahedral sites in Mg ferrites has been studiedwith dilatometricmeasurements

  17. Tropical forest soil microbial communities couple iron and carbon biogeochemistry

    SciTech Connect (OSTI)

    Dubinsky, E.A.; Silver, W.L.; Firestone, M.K.

    2009-10-15T23:59:59.000Z

    We report that iron-reducing bacteria are primary mediators of anaerobic carbon oxidation in upland tropical soils spanning a rainfall gradient (3500 - 5000 mm yr-1) in northeast Puerto Rico. The abundant rainfall and high net primary productivity of these tropical forests provide optimal soil habitat for iron-reducing and iron-oxidizing bacteria. Spatially and temporally dynamic redox conditions make iron-transforming microbial communities central to the belowground carbon cycle in these wet tropical forests. The exceedingly high abundance of iron-reducing bacteria (up to 1.2 x 10{sup 9} cells per gram soil) indicated that they possess extensive metabolic capacity to catalyze the reduction of iron minerals. In soils from the higher rainfall sites, measured rates of ferric iron reduction could account for up to 44 % of organic carbon oxidation. Iron reducers appeared to compete with methanogens when labile carbon availability was limited. We found large numbers of bacteria that oxidize reduced iron at sites with high rates of iron reduction and large numbers of iron-reducers. the coexistence of large populations of ironreducing and iron-oxidizing bacteria is evidence for rapid iron cycling between its reduced and oxidized states, and suggests that mutualistic interactions among these bacteria ultimately fuel organic carbon oxidation and inhibit CH4 production in these upland tropical forests.

  18. Magnesium deficiency and type of protein during gestation and lactation in rats

    E-Print Network [OSTI]

    Holmes, Kathryn Ellen Hughes

    1988-01-01T23:59:59.000Z

    to the irregular schedule of cage clean1ng. 13 Animals were observed for physical signs of magnesium deficiency. Upon parturition the stainless steel grids were removed from the cages, and dams and pups were maintained on the wood-chip bedding... in a machine designed for this pur- pose. Clean cages with fresh wood-chip bedding were provided as needed, and clean feeders were provided weekly. All other instruments and glassware used in the study were acid-washed in 10% nitric acid or soaked...

  19. Steam reforming utilizing iron oxide catalyst

    SciTech Connect (OSTI)

    Setzer, H. T.; Bett, J. A. S.

    1985-06-11T23:59:59.000Z

    High activity steam reforming iron oxide catalysts are described. Such catalysts can be unsupported utilizing at least 90% by weight iron oxide and various modifiers (Ai/sub 2/O/sub 3/, K/sub 2/O, CaO, SiO/sub 2/) or unmodified and supported on such things as alumina, CaO impregnated alumina, and lanthanum stabilized alumina. When used in steam reformers such as autothermal and tubular steam reformers, these catalysts demonstrate much improved resistance to carbon plugging.

  20. Iron Availability in the Southern Ocean

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12 Investigation Peer Review 2012IowaFebruaryIronIron

  1. Preparations of rare earth-iron alloys by thermite reduction

    DOE Patents [OSTI]

    Schmidt, F.A.; Peterson, D.T.; Wheelock, J.T.

    1985-10-28T23:59:59.000Z

    Disclosed is an improved method for the preparation of high-purity rare earth-iron alloys by the aluminothermic reduction of a mixture of rare earth and iron fluorides.

  2. Candidate anode materials for iron production by molten oxide electrolysis

    E-Print Network [OSTI]

    Paramore, James D

    2010-01-01T23:59:59.000Z

    Molten oxide electrolysis (MOE) has been identified by the American Iron and Steel Institute (AISI) as one of four possible breakthrough technologies to alleviate the environmental impact of iron and steel production. This ...

  3. Iron-based Superconductor Simulations Spin Out New Possibilities...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    in 15 iron-based materials, including iron compounds that are high-temperature superconductors (images d-h). The x axis shows the momentum of the spin excitation in selected...

  4. The marine biogeochemistry of dissolved and colloidal iron

    E-Print Network [OSTI]

    Fitzsimmons, Jessica Nicole

    2013-01-01T23:59:59.000Z

    Iron is a redox active trace metal micronutrient essential for primary production and nitrogen acquisition in the open ocean. Dissolved iron (dFe) has extremely low concentrations in marine waters that can drive phytoplankton ...

  5. arabian iron age: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    iron deficiency should be the goal of nutritional intervention programs. In the United States, approximately 5 % of children from 1-5 years of age suffer from iron deficiency...

  6. Effect of dietary magnesium and calcium on blood lipids and minerals in tissues in rats fed a high fat diet

    E-Print Network [OSTI]

    Conboy-Downs, Jean

    1991-01-01T23:59:59.000Z

    EFFECT OF DIETARY MAGNESIUM AND CALCIUM ON BLOOD LIPIDS AND MINERALS ZN TISSUES IN BATS FED A HIGH FAT DIET A Thesis by JEAN CONBOY-DONNS Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE May 1991 Major Subject: Nutrition EFFECT OF DIETARY MAGNESIUM AND CALCIUM ON BLOOD LIPZDS AND MZNERALS ZN TISSUES IN RATS FED A BIGS FAT DIET A Thesis by JEAN CONBOY-DOWNS Approved as to style...

  7. The determination of the bioavailability and the site of absorption in lambs fed different sources of magnesium

    E-Print Network [OSTI]

    Hurley, Leigh Anne

    1988-01-01T23:59:59.000Z

    followed by a 3-d total collection of feces and urine. Fecal excretions and apparent absorptions of Mg increased (P&. 05) 43 and 320'4 respectively, as Ng intakes increased (P&. 05) from . 96 to 1. 85 g/d intake. Apparent Ng absorptions were . 17, . 51...'% with and average of . 10% in order to meet daily Hg requirements . $0 Magnesium Losses Magnesium is lost from the body by three main zoutes: milk, urine and feces (Allczoft and Burns, 1968). The main route of Ng excretion is by way of the feces (Todd, 1976...

  8. Effect of dietary magnesium and calcium on blood lipids and minerals in tissues in rats fed a high fat diet 

    E-Print Network [OSTI]

    Conboy-Downs, Jean

    1991-01-01T23:59:59.000Z

    EFFECT OF DIETARY MAGNESIUM AND CALCIUM ON BLOOD LIPIDS AND MINERALS ZN TISSUES IN BATS FED A HIGH FAT DIET A Thesis by JEAN CONBOY-DONNS Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE May 1991 Major Subject: Nutrition EFFECT OF DIETARY MAGNESIUM AND CALCIUM ON BLOOD LIPZDS AND MZNERALS ZN TISSUES IN RATS FED A BIGS FAT DIET A Thesis by JEAN CONBOY-DOWNS Approved as to style...

  9. The effects of a marginal intake of magnesium with soy protein concentrate on growth, gestation, and lactation in the rat 

    E-Print Network [OSTI]

    McLaughlin, Cynthia Anne

    1986-01-01T23:59:59.000Z

    THE EFFECTS OF A MARGINAL INTAKE OF MAGNESIUM WITH SOY PROTEIN CONCENTRATE ON GROWTH, GESTATION, AND LACTATION IN THE RAT A Thesis by CYNTHIA ANNE MCLAUGHLIN Submitted to the Graduate College of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE May 19B6 Major Subject: Nutrrtion THE EFFECTS OF A MARGINAL INTAKE OF MAGNESIUM WITH SOY PROTEIN CONCENTRATE ON GROWTH, GESTATION, AND LACTATION IN THE RAT A Thesis by CYNTHIA ANNE MCLAUGHLIN Approved...

  10. Lithium Iron Phosphate Composites for Lithium Batteries | Argonne...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Lithium Iron Phosphate Composites for Lithium Batteries Technology available for licensing: Inexpensive, electrochemically active phosphate compounds with high functionality for...

  11. Minnesota Jobs to Come with Efficient Iron Plant

    Broader source: Energy.gov [DOE]

    New energy-efficient iron plant offers a ray of hope for workers after local mining company shuts down.

  12. Synthesis, structures and properties of a series of manganese coordination complexes constructed from dicarboxylic fluorene derivatives

    SciTech Connect (OSTI)

    Li Xing, E-mail: lixing@nbu.edu.cn [State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211 (China); Zhao Xiuhua; Bing Yue; Zha Meiqin; Xie Hongzhen; Guo Zhiyong [State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211 (China)

    2013-01-15T23:59:59.000Z

    Assembly reactions of 9,9-diethylfluorene-2,7-dicarboxylic acid (H{sub 2}DFDC) and Mn(CH{sub 3}COO){sub 2}{center_dot}4H{sub 2}O or MnCl{sub 2}{center_dot}4H{sub 2}O by tuning of various secondary ligands such as 2,2 Prime -bipyridine (2,2 Prime -bpy), 4,4 Prime -bipyridine (4,4 Prime -bpy) or 1,3-bis(4-pyridyl)propane) (bpp), gave rise to four complexes {l_brace} [Mn{sub 2}(DFDC){sub 2}(DMF){sub 2}]{center_dot}H{sub 2}O{r_brace} {sub n} (1), [Mn(DFDC)(2,2 Prime -bpy)]{sub n} (2), {l_brace} [Mn{sub 2}(DFDC){sub 2}(4,4 Prime -bpy){sub 2}]{center_dot}2CH{sub 3}OH{r_brace} {sub n} (3), and {l_brace} [Mn{sub 4}(DFDC){sub 4}(bpp){sub 2}(CH{sub 3}OH){sub 3} (H{sub 2}O){sub 3}]{center_dot}3(CH{sub 3}OH){center_dot}3(H{sub 2}O){r_brace} {sub n} (4). Single crystal X-ray diffraction analysis reveal that complex 1 is three dimensional structure with rhombic channels filled by guest water molecules; 2 presents a close-packed structure with high thermal stability; 3 exhibits a three dimensional framework with micro-porous channels filled by guest methanol molecules and 4 is a two-dimensional structure. The photoluminescent properties of 1-4 have been studied, respectively, showing that the Mn(II) ions, accessorial organic ligands or crystal structures exert important influences on the photoluminescence emissions of H{sub 2}DFDC ligands. Thermogravimetric analysis show that the complexes have remarkably high thermal stability. Magnetic susceptibility measurements have been finished and discussed for the complexes. - Graphical abstract: Assembly of 9,9-diethylfluorene-2,7-dicarboxylic acid and Mn(II) salts by tuning of various accessorial ligands resulted in four manganese complexes with different topological frameworks. Highlights: Black-Right-Pointing-Pointer Four manganese complexes based on 9,9-diethylfluorene-2,7-dicarboxylic acid were obtained. Black-Right-Pointing-Pointer The complexes were structurally characterized by single-crystal X-ray diffraction. Black-Right-Pointing-Pointer The complexes 1-4 display different topological structures. Black-Right-Pointing-Pointer Thermogravimetric analysis show the complexes have remarkably high thermal stability.

  13. Versatile ferrofluids based on polyethylene glycol coated iron oxide nanoparticles

    E-Print Network [OSTI]

    Versatile ferrofluids based on polyethylene glycol coated iron oxide nanoparticles W. Brullot a coated iron oxide nanoparticles were obtained by a facile protocol and thoroughly characterized to chemical treatments and biocompatible [12]. An impression of an iron oxide nanoparticle coated with a PEG

  14. The Adsorption of Arsenic Oxyacids to Iron Oxyhydroxide Columns

    E-Print Network [OSTI]

    The Adsorption of Arsenic Oxyacids to Iron Oxyhydroxide Columns Including Studies of Weakly. (photo: Mr. J. Mähler, image editing Dr. D. Lundberg) #12;The Adsorption of Arsenic Oxyacids to Iron of columns and iron content of the adsorbent material. Experiments have shown that adsorption does occur

  15. Bronze metallurgy in Iron Age central Europe : a metallurgical study of Early Iron Age bronzes from Sti?na, Slovenia.

    E-Print Network [OSTI]

    Cooney, Elizabeth Myers

    2007-01-01T23:59:59.000Z

    The Early Iron Age (750-450 BCE) marks a time in the European Alpine Region in which cultural ideologies surrounding bronze objects and bronze production were changing. Iron was becoming the preferred material from which ...

  16. Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide

    SciTech Connect (OSTI)

    Jiang, Weilin; Jung, Hee Joon; Kovarik, Libor; Wang, Zhaoying; Roosendaal, Timothy J.; Zhu, Zihua; Edwards, Danny J.; Hu, Shenyang Y.; Henager, Charles H.; Kurtz, Richard J.; Wang, Yongqiang

    2015-01-01T23:59:59.000Z

    As a candidate material for fusion reactor applications, silicon carbide (SiC) undergoes transmutation reactions under high-energy neutron irradiation with magnesium as the major metallic transmutant; the others include aluminum, beryllium and phosphorus in addition to helium and hydrogen gaseous species. The impact of these transmutants on SiC structural stability is currently unknown. This study uses ion implantation to introduce Mg into SiC. Multiaxial ion-channeling analysis of the as-produced damage state suggests that there are preferred Si <100> interstitial splits. The microstructure of the annealed sample was examined using high-resolution scanning transmission electron microscopy. The results show a high concentration of likely non-faulted tetrahedral voids and possible stacking fault tetrahedra near the damage peak. In addition to lattice distortion, dislocations and intrinsic and extrinsic stacking faults are also observed. Magnesium in 3C-SiC prefers to substitute for Si and it forms precipitates of cubic Mg2Si and tetragonal MgC2. The diffusion coefficient of Mg in 3C-SiC single crystal at 1573 K has been determined to be 3.8±0.4×10e-19 m2/sec.

  17. Manufacture of gradient micro-structures of magnesium alloys using two stage extrusion dies

    SciTech Connect (OSTI)

    Hwang, Yeong-Maw; Huang, Tze-Hui [Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, No. 70, Lien-Hai Rd., Kaohsiung, 804, Taiwan (China); Alexandrov, Sergei [Institute for Problems in Mechanics, Russian Academy of Sciences, Moscow (Russian Federation); Naimark, Oleg Borisovich [Institute of Continuous Media Mechanics, Russian Academy of Sciences, Perm (Russian Federation); Jeng, Yeau-Ren [Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-tech Innovations, National Chung Cheng University, Ming-Hsiung, Chia-Yi 621, Taiwan (China)

    2013-12-16T23:59:59.000Z

    This paper aims to manufacture magnesium alloy metals with gradient micro-structures using hot extrusion process. The extrusion die was designed to have a straight channel part combined with a conical part. Materials pushed through this specially-designed die generate a non-uniform velocity distribution at cross sections inside the die and result in different strain and strain rate distributions. Accordingly, a gradient microstructure product can be obtained. Using the finite element analysis, the forming temperature, effective strain, and effective strain rate distributions at the die exit were firstly discussed for various inclination angles in the conical die. Then, hot extrusion experiments with a two stage die were conducted to obtain magnesium alloy products with gradient micro-structures. The effects of the inclination angle on the grain size distribution at cross sections of the products were also discussed. Using a die of an inclination angle of 15°, gradient micro-structures of the grain size decreasing gradually from 17 ?m at the center to 4 ?m at the edge of product were achieved.

  18. Thermal Property Evaluation of Cerium Dioxide and Cerium Dioxide Magnesium Oxide Powders for Testing Plutonium

    SciTech Connect (OSTI)

    HOYT, R C

    2002-06-01T23:59:59.000Z

    Ceric oxide (CeO{sub 2}) and mixtures of CeO{sub 2} -magnesium oxide (MgO) have been utilized at the Plutonium Finishing Plant (PFP) as surrogate materials to represent plutonium dioxide (PuO{sub 2}) and impure PuO{sub 2} containing impurities such as MgO during verification tests on PFP's stabilization furnaces. Magnesium oxide was selected during furnace testing as the impurity of interest since much of the impure PuO{sub 2} to be stabilized and packaged at the PFP contains significant amounts of MgO from solution stabilization work. The issue being addressed in this study is whether or not heating the surrogate materials to 950 C adequately simulates heating PuO{sub 2} powders to 950 C. This paper evaluates some of the thermal properties of these oxides, as related to the heating of powders of these materials where heat transfer within the powders is governed primarily by conduction. Detailed heat transfer modeling was outside the scope of this paper.

  19. Iron distribution and phytoplankton iron limitation in the southern California Current System

    E-Print Network [OSTI]

    King, Andrew Luke

    2008-01-01T23:59:59.000Z

    layer density (sigma-theta) are shown for six CalCOFI surveysolution (Sigma-Aldrich) in 0.016 M ultrapure HCl every sixsigma-theta. Macronutrients, dissolved iron, and chl were elevated during all six

  20. Iron Air collision with high density QCD

    E-Print Network [OSTI]

    Hans-Joachim Drescher

    2006-12-08T23:59:59.000Z

    The color glass condensate approach describes successfully heavy ion collisions at RHIC. We investigate Iron-air collisions within this approach and compare results to event generators commonly used in air shower simulations. We estimate uncertainties in the extrapolation to GZK energies and discuss implications for air shower simulations.

  1. Superconductivity in iron compounds G. R. Stewart

    E-Print Network [OSTI]

    Wu, Zhigang

    of the superconductivity in this new class of compounds. These iron pnictide and chalcogenide (FePn/Ch) superconductors-phonon coupled ``conventional'' superconductors. Clearly, superconductivity and magnetism or magnetic of magnetism and superconductivity in FePn/Ch superconductors 1606 D. Tc and TS=TSDW versus pressure 1607 1

  2. Ligand effects on bioinspired iron complexes

    E-Print Network [OSTI]

    Mejia Rodriguez, Ma. del Rosario

    2005-11-01T23:59:59.000Z

    - phosphaadamantane, PTA, coordinates to the Fe centers forming the disubstituted complex (m-pdt)[Fe(CO)2PTA]2, which presents one PTA in each iron in a transoid arrangement. Substitution of one CO ligand in the (m-pdt)[Fe(CO)3]2 parent complex forms the asymmetric (m-pdt)[Fe...

  3. Enhanced power factor of higher manganese silicide via melt spin synthesis method

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Shi, Xiaoya [Brookhaven National Lab. (BNL), Upton, NY (United States); Shi, Xun [Chinese Academy of Sciences, Shanghai (China); Li, Yulong [Chinese Academy of Sciences, Shanghai (China); He, Ying [Chinese Academy of Sciences, Shanghai (China); Chen, Lidong [Chinese Academy of Sciences, Shanghai (China); Li, Qiang [Brookhaven National Lab. (BNL), Upton, NY (United States)

    2014-12-28T23:59:59.000Z

    We report on the thermoelectric properties of the Higher Manganese Silicide MnSi?.?? (HMS) synthesized by means of a one-step non-equilibrium method. The ultrahigh cooling rate generated from the melt-spin technique is found to be effective in reducing second phases, which are inevitable during the traditional solid state diffusion processes. Aside from being detrimental to thermoelectric properties, second phases skew the revealing of the intrinsic properties of this class of materials, for example the optimal level of carrier concentration. With this melt-spin sample, we are able to formulate a simple model based on a single parabolic band that can well describe the carrier concentration dependence of the Seebeck coefficient and power factor of the data reported in the literature. An optimal carrier concentration around 5x10²? cm?³ at 300 K is predicted according to this model. The phase-pure melt-spin sample shows the largest power factor at high temperature, resulting in the highest zT value among the three samples in this paper. And the maximum value is superior to those reported in the literatures.

  4. Influence of nitrogen sufficiency and manganese deficiency on PAH degradation by Bjerkandera sp.

    SciTech Connect (OSTI)

    Kotterman, M.J.J.; Wasseveld, R.; Field, J.A. [Wageningen Agricultural Univ. (Netherlands). Div. of Industrial Microbiology

    1995-12-31T23:59:59.000Z

    The effect of Mn and N nutrients on the biodegradation of the model polycyclic aromatic hydrocarbon (PAH) compound, anthracene, by the N-deregulated ligninolytic fungus Bjerkandera sp. BOS55 was studied. Organic N supplements in the form of an amino acid mixture or peptone resulted in 10- to 14-fold increases in the extracellular peroxidase titers compared to those obtained in the basal N-limited medium. Although these enzymes are involved in the initial attack on PAH, the peptone supplement only increased the rate of anthracene elimination by 2.5 fold. The absence of Mn, which decreased the manganese peroxidase (MnP) titer and increased the lignin peroxidase (LiP) titer, was associated with a large improvement in the anthracene degradation. Mn deficiency also increased the yield of anthraquinone, a known product from peroxidase-mediated conversions of anthracene. Under the best conditions, with peptone N supplementing Mn-free medium, the anthracene degradation rate was 31 mg L{sup {minus}1} day{sup {minus}1}.

  5. Synthesis and crystal structure of the coordination compound of pyridoxine with manganese sulfate

    SciTech Connect (OSTI)

    Furmanova, N. G., E-mail: furm@ns.crys.ras.ru; Verin, I. A. [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation); Shyityeva, N.; Sulaimankulov, K. S.; Berdalieva, Zh.; Resnyanskii, V. F. [National Academy of Sciences of Kyrgyzstan, Institute of Chemistry and Chemical Technology (Kyrgyzstan); Duishenbaeva, A. T. [Kyrgyz National University (Kyrgyzstan)

    2011-11-15T23:59:59.000Z

    The reaction of pyridoxine with manganese sulfate in an aqueous solution gave the coordination compound MnSO{sub 4} {center_dot} 2C{sub 8}H{sub 11}O{sub 3}N {center_dot} 2H{sub 2}O (I). The structure of I was determined from single-crystal X-ray diffraction data. In the centrosymmetric complex (sp. gr. P1-bar, Z = 1), the Mn atom is coordinated by two pyridoxine molecules and two water molecules, thus adopting an octahedral coordination. The sulfate anion is also at a center of symmetry and, consequently, is disordered. The pyridoxine molecules are coordinated to the metal atom through the oxygen atoms of the deprotonated hydroxyl group and the CH{sub 2}OH group that retains the hydrogen atom. The nitrogen atom is protonated in such a way that the heterocycle assumes a pyridinium character. The crystal structure also contains six water molecules of crystallization. A thermogravimetric study showed that the decomposition of I occurs in several successive steps, such as dehydration, the combustion of organic ligands, and the formation of an inorganic residue.

  6. Approaching the Minimum Thermal Conductivity in Rhenium-Substituted Higher Manganese Silicides

    SciTech Connect (OSTI)

    Chen, Xi [University of Texas at Austin] [University of Texas at Austin; Girard, S. N. [University of Wisconsin, Madison] [University of Wisconsin, Madison; Meng, F. [University of Wisconsin, Madison] [University of Wisconsin, Madison; Lara-Curzio, Edgar [ORNL] [ORNL; Jin, S [University of Wisconsin, Madison] [University of Wisconsin, Madison; Goodenough, J. B. [University of Texas at Austin] [University of Texas at Austin; Zhou, J. S. [University of Texas at Austin] [University of Texas at Austin; Shi, L [University of Texas at Austin] [University of Texas at Austin

    2014-01-01T23:59:59.000Z

    Higher manganese silicides (HMS) made of earth-abundant and non-toxic elements are regarded as promising p-type thermoelectric materials because their complex crystal structure results in low lattice thermal conductivity. It is shown here that the already low thermal conductivity of HMS can be reduced further to approach the minimum thermal conductivity via partial substitu- tion of Mn with heavier rhenium (Re) to increase point defect scattering. The solubility limit of Re in the obtained RexMn1 xSi1.8 is determined to be about x = 0.18. Elemental inhomogeneity and the formation of ReSi1.75 inclusions with 50 200 nm size are found within the HMS matrix. It is found that the power factor does not change markedly at low Re content of x 0.04 before it drops considerably at higher Re contents. Compared to pure HMS, the reduced lattice thermal conductivity in RexMn1 xSi1.8 results in a 25% increase of the peak figure of merit ZT to reach 0.57 0.08 at 800 K for x = 0.04. The suppressed thermal conductivity in the pure RexMn1 xSi1.8 can enable further investigations of the ZT limit of this system by exploring different impurity doping strategies to optimize the carrier concentration and power factor.

  7. Enhanced power factor of higher manganese silicide via melt spin synthesis method

    SciTech Connect (OSTI)

    Shi, Xiaoya [Brookhaven National Lab. (BNL), Upton, NY (United States); Shi, Xun [Chinese Academy of Sciences, Shanghai (China); Li, Yulong [Chinese Academy of Sciences, Shanghai (China); He, Ying [Chinese Academy of Sciences, Shanghai (China); Chen, Lidong [Chinese Academy of Sciences, Shanghai (China); Li, Qiang [Brookhaven National Lab. (BNL), Upton, NY (United States)

    2014-12-28T23:59:59.000Z

    We report on the thermoelectric properties of the Higher Manganese Silicide MnSi?.?? (HMS) synthesized by means of a one-step non-equilibrium method. The ultrahigh cooling rate generated from the melt-spin technique is found to be effective in reducing second phases, which are inevitable during the traditional solid state diffusion processes. Aside from being detrimental to thermoelectric properties, second phases skew the revealing of the intrinsic properties of this class of materials, for example the optimal level of carrier concentration. With this melt-spin sample, we are able to formulate a simple model based on a single parabolic band that can well describe the carrier concentration dependence of the Seebeck coefficient and power factor of the data reported in the literature. An optimal carrier concentration around 5x10²? cm?³ at 300 K is predicted according to this model. The phase-pure melt-spin sample shows the largest power factor at high temperature, resulting in the highest zT value among the three samples in this paper. And the maximum value is superior to those reported in the literatures.

  8. Solar-thermal Water Splitting Using the Sodium Manganese Oxide Process & Preliminary H2A Analysis

    SciTech Connect (OSTI)

    Todd M. Francis, Paul R. Lichty, Christopher Perkins, Melinda Tucker, Peter B. Kreider, Hans H. Funke, Allan Lewandowski, and Alan W. Weimer

    2012-10-24T23:59:59.000Z

    There are three primary reactions in the sodium manganese oxide high temperature water splitting cycle. In the first reaction, Mn2O3 is decomposed to MnO at 1,500°C and 50 psig. This reaction occurs in a high temperature solar reactor and has a heat of reaction of 173,212 J/mol. Hydrogen is produced in the next step of this cycle. This step occurs at 700°C and 1 atm in the presence of sodium hydroxide. Finally, water is added in the hydrolysis step, which removes NaOH and regenerates the original reactant, Mn2O3. The high temperature solar�driven step for decomposing Mn2O3 to MnO can be carried out to high conversion without major complication in an inert environment. The second step to produce H2 in the presence of sodium hydroxide is also straightforward and can be completed. The third step, the low temperature step to recover the sodium hydroxide is the most difficult. The amount of energy required to essentially distill water to recover sodium hydroxide is prohibitive and too costly. Methods must be found for lower cost recovery. This report provides information on the use of ZnO as an additive to improve the recovery of sodium hydroxide.

  9. Enhanced power factor of higher manganese silicide via melt spin synthesis method

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Shi, Xiaoya; Shi, Xun; Li, Yulong; He, Ying; Chen, Lidong; Li, Qiang

    2014-12-28T23:59:59.000Z

    We report on the thermoelectric properties of the Higher Manganese Silicide MnSi?.?? (HMS) synthesized by means of a one-step non-equilibrium method. The ultrahigh cooling rate generated from the melt-spin technique is found to be effective in reducing second phases, which are inevitable during the traditional solid state diffusion processes. Aside from being detrimental to thermoelectric properties, second phases skew the revealing of the intrinsic properties of this class of materials, for example the optimal level of carrier concentration. With this melt-spin sample, we are able to formulate a simple model based on a single parabolic band that can well describemore »the carrier concentration dependence of the Seebeck coefficient and power factor of the data reported in the literature. An optimal carrier concentration around 5x10²? cm?³ at 300 K is predicted according to this model. The phase-pure melt-spin sample shows the largest power factor at high temperature, resulting in the highest zT value among the three samples in this paper. And the maximum value is superior to those reported in the literatures.« less

  10. Investigation of the Highly Active Manganese Superoxide Dismutase from Saccharomyces cerevisiae

    SciTech Connect (OSTI)

    Cabelli, D.E.; Barnese, K.; Sheng, Y.; Stich, T.A.; Gralla, E.B.; Britt, R.D.; Valentine, J.S.

    2010-09-15T23:59:59.000Z

    Manganese superoxide dismutase (MnSOD) from different species differs in its efficiency in removing high concentrations of superoxide (O{sub 2}{sup -}), due to different levels of product inhibition. Human MnSOD exhibits a substantially higher level of product inhibition than the MnSODs from bacteria. In order to investigate the mechanism of product inhibition and whether it is a feature common to eukaryotic MnSODs, we purified MnSOD from Saccharomyces cerevisiae (ScMnSOD). It was a tetramer with 0.6 equiv of Mn per monomer. The catalytic activity of ScMnSOD was investigated by pulse radiolysis and compared with human and two bacterial (Escherichia coli and Deinococcus radiodurans) MnSODs. To our surprise, ScMnSOD most efficiently facilitates removal of high concentrations of O{sub 2}{sup -} among these MnSODs. The gating value k{sub 2}/k{sub 3} that characterizes the level of product inhibition scales as ScMnSOD > D. radiodurans MnSOD > E. coli MnSOD > human MnSOD. While most MnSODs rest as the oxidized form, ScMnSOD was isolated in the Mn{sup 2+} oxidation state as revealed by its optical and electron paramagnetic resonance spectra. This finding poses the possibility of elucidating the origin of product inhibition by comparing human MnSOD with ScMnSOD.

  11. Magnesium aluminate (MgAl2O4) spinel produced via self-heat-sustained (SHS) technique

    E-Print Network [OSTI]

    Azad, Abdul-Majeed

    , conventional solid-state-reaction (SSR), sol-gel, spray drying (atomization) and organic gel-assisted citrateMagnesium aluminate (MgAl2O4) spinel produced via self-heat-sustained (SHS) technique Lim Rooi Pinga,1 , Abdul-Majeed Azadb, *, Teng Wan Dunga a Ceramics Technology Center, SIRIM Berhad, 1 Persiaran

  12. A Comparison of Magnesium and Beryllium Acceptors in GaN Grown by rf-Plasma Assisted Molecular Beam Epitaxy

    E-Print Network [OSTI]

    Myers, Tom

    as a function of substrate temperature and dopant flux for Ga-polarity and N-polarity GaN. Incorporation GaN templates on (0001) sapphire substrates. The doped layers were grown at a rate of 0.25 µmA Comparison of Magnesium and Beryllium Acceptors in GaN Grown by rf-Plasma Assisted Molecular Beam

  13. Visualizing Iron Deposition in Multiple Sclerosis Cadaver Brains

    SciTech Connect (OSTI)

    Habib, Charbel A.; Zheng Weili; Mark Haacke, E. [Department Of Biomedical Engineering, Wayne State University, Detroit, MI 48202 (United States); Webb, Sam [Stanford Synchrotron Radiation Lightsource, Stanford Linear Accelerator Complex National Accelerator Laboratory, Menlo Park, California (United States); Nichol, Helen [Department of Anatomy and Cell Biology, University of Saskatchewan, 107 Wiggins Rd. Rm A302, Saskatoon, SK S7N5E5 (Canada)

    2010-07-23T23:59:59.000Z

    Aim: To visualize and validate iron deposition in two cases of multiple sclerosis using rapid scanning X-Ray Fluorescence (RS-XRF) and Susceptibility Weighted Imaging (SWI). Material and Methods: Two (2) coronal cadaver brain slices from patients clinically diagnosed with multiple sclerosis underwent magnetic resonance imaging (MRI), specifically SWI to image iron content. To confirm the presence of iron deposits and the absence of zinc-rich myelin in lesions, iron and zinc were mapped using RS-XRF. Results: MS lesions were visualized using FLAIR and correlated with the absence of zinc by XRF. XRF and SWI showed that in the first MS case, there were large iron deposits proximal to the draining vein of the caudate nucleus as well as iron deposits associated with blood vessels throughout the globus pallidus. Less iron was seen in association with lesions than in the basal ganglia. The presence of larger amounts of iron correlated reasonably well between RS-XRF and SWI. In the second case, the basal ganglia appeared normal and acute perivascular iron deposition was absent. Conclusion: Perivascular iron deposition is seen in some but not all MS cases, giving credence to the use of SWI to assess iron involvement in MS pathology in vivo.

  14. Method for preparing hydrous iron oxide gels and spherules

    DOE Patents [OSTI]

    Collins, Jack L.; Lauf, Robert J.; Anderson, Kimberly K.

    2003-07-29T23:59:59.000Z

    The present invention is directed to methods for preparing hydrous iron oxide spherules, hydrous iron oxide gels such as gel slabs, films, capillary and electrophoresis gels, iron monohydrogen phosphate spherules, hydrous iron oxide spherules having suspendable particles homogeneously embedded within to form composite sorbents and catalysts, iron monohydrogen phosphate spherules having suspendable particles of at least one different sorbent homogeneously embedded within to form a composite sorbent, iron oxide spherules having suspendable particles homogeneously embedded within to form a composite of hydrous iron oxide fiber materials, iron oxide fiber materials, hydrous iron oxide fiber materials having suspendable particles homogeneously embedded within to form a composite, iron oxide fiber materials having suspendable particles homogeneously embedded within to form a composite, dielectric spherules of barium, strontium, and lead ferrites and mixtures thereof, and composite catalytic spherules of barium or strontium ferrite embedded with oxides of Mg, Zn, Pb, Ce and mixtures thereof. These variations of hydrous iron oxide spherules and gel forms prepared by the gel-sphere, internal gelation process offer more useful forms of inorganic ion exchangers, catalysts, getters, dielectrics, and ceramics.

  15. Magnesium Projects

    Broader source: Energy.gov (indexed) [DOE]

    cyberinfrastructure projects and will be augmented by original research in Computer Science and Software Engineering towards the creation of large, distributed, autonomic and...

  16. Comparison of gleptoferron iron compound to two commonly used iron supplements for the prevention of baby pig anemia

    E-Print Network [OSTI]

    Homann, Ervin R.

    1985-01-01T23:59:59.000Z

    access to soil, the pigs become anemic if they are denied access to sources of iron other than the sow's milk. Even with the best management systems, supplemental iron is required because the pig is born with limited iron body stores ((50 mg). sow.... 1957. A parenteral hematinic for the control of iron- deficiency anemia in baby pigs. N, Am. Vet. 38:6. London, E. and G. D. Twigg. 1952. (Unpublished). Maner, J. H. , W. G. Pond and R. S. Lowrey. 1959. Effect of method and level of iron...

  17. Search for new manganese-cobalt oxides as positive electrode materials for lithium batteries P. Strobel, J. Tillier, A. Diaz, A. Ibarra-Palos, F. Thiry and J.B. Soupart *

    E-Print Network [OSTI]

    Boyer, Edmond

    positive electrode material for lithium batteries ; last but not least, copper or cobalt substitutionSearch for new manganese-cobalt oxides as positive electrode materials for lithium batteries P new mixed manganese-cobalt oxides for lithium battery positive electrode materials were obtained using

  18. Site-specific local structure of Mn in artificial manganese ferrite films E. Kravtsov,1,2 D. Haskel,1 A. Cady,1 A. Yang,3 C. Vittoria,3 X. Zuo,4 and V. G. Harris3

    E-Print Network [OSTI]

    Haskel, Daniel

    Site-specific local structure of Mn in artificial manganese ferrite films E. Kravtsov,1,2 D. Haskel in manganese ferrite films grown under nonequilibrium conditions. The DAFS spectra were measured at a number. INTRODUCTION There has been considerable long-term interest in spinel ferrite materials due

  19. Effects of soil treatments supplemented with two rates of magnesium sulfate on the availability of soil nutrients and on the yield and chemical composition of coastal Bermuda grass 

    E-Print Network [OSTI]

    Evatt, Nathan S

    1951-01-01T23:59:59.000Z

    'ZATZ ON THE AVAILABILITY OF SOIL NUTRIENTS AND ON TH YIELD AND CHENICAL COMPOSITICN GF CO. iSTAL BERNUDA GHASS INTRODUCTION It is known that magnesium is one of' the elements essential for plant growth; however much is to be learned concerning its specific functions... within the plant, Host Texas soils are not deficient, in magnesium (23). Magnesium is reported to be a carrier of the phos- phorus used by the plant. It is entirely possible that the failure to obtain crops of higher phosphorus content upon...

  20. Evaluation of the Magnesium Hydroxide Treatment Process for Stabilizing PFP Plutonium/Nitric Acid Solutions

    SciTech Connect (OSTI)

    Gerber, Mark A.; Schmidt, Andrew J.; Delegard, Calvin H.; Silvers, Kurt L.; Baker, Aaron B.; Gano, Susan R.; Thornton, Brenda M.

    2000-09-28T23:59:59.000Z

    This document summarizes an evaluation of the magnesium hydroxide [Mg(OH)2] process to be used at the Hanford Plutonium Finishing Plant (PFP) for stabilizing plutonium/nitric acid solutions to meet the goal of stabilizing the plutonium in an oxide form suitable for storage under DOE-STD-3013-99. During the treatment process, nitric acid solutions bearing plutonium nitrate are neutralized with Mg(OH)2 in an air sparge reactor. The resulting slurry, containing plutonium hydroxide, is filtered and calcined. The process evaluation included a literature review and extensive laboratory- and bench-scale testing. The testing was conducted using cerium as a surrogate for plutonium to identify and quantify the effects of key processing variables on processing time (primarily neutralization and filtration time) and calcined product properties.

  1. Punchless Drawing of Magnesium Alloy Sheet under Cold Condition and its Computation

    SciTech Connect (OSTI)

    Yamashita, Minoru [Center for Advanced Die Engineering and Technology, Gifu University, Yanagido Gifu, 501-1193 (Japan); Hattori, Toshio [Department of Mechanical and Systems Engineering, Gifu University, ditto. (Japan); Sato, Joji [Research Institute for Machinery and Materials, Gifu Prefectural Government, 1288 Oze Seki, 501-3265 (Japan)

    2011-01-17T23:59:59.000Z

    The punchless drawing with Maslennikov's technique was applied to the circular cup drawing of magnesium alloy AZ31B sheet under cold condition. The elastic rubber ring was used instead of the 'hard' punch, where the compressed ring dragged the sheet inward the die cavity. Attainable circumferential strain of the blank was increased by this technique with repetitive drawing operation. Thickness of the rubber pad affected little the attainable strain. The shape appearance became better when a harder rubber was used. The cup forming by single drawing operation was also tested using a small die shoulder radius. The LDR of 1.250 was obtained with the straight cup wall. Further, the computation of the punchless drawing was also conducted for the single drawing operation. The computed deformation pattern was well consistent with the corresponding experimental result.

  2. Multiple-shocks induced nanocrystallization in iron

    SciTech Connect (OSTI)

    Matsuda, Tomoki; Hirose, Akio [Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871 (Japan); Sano, Tomokazu [Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871 (Japan); JST, CREST, Suita, Osaka 565-0871 (Japan); Arakawa, Kazuto [JST, CREST, Suita, Osaka 565-0871 (Japan); Department of Material Science, Interdisciplinary Faculty of Science and Engineering, Shimane University, Matsue, Shimane 690-8504 (Japan)

    2014-07-14T23:59:59.000Z

    We found that multiple shots of femtosecond laser-driven shock pulses changed coarse crystalline iron grains with a size of 140??m into nanocrystals with a high density of dislocations, which had never been observed in conventional shock processes. We performed metallurgical microstructure observations using transmission electron microscopy (TEM) and hardness measurements using nanoindentation on cross-sections of shocked iron. TEM images showed that grains with sizes from 10?nm through 1??m exist within 2??m of the surface, where the dislocation density reached 2?×?10{sup 15?}m{sup ?2}. Results of the hardness measurements showed a significant increase in hardness in the nanocrystallized region. We suggest that the formation of a high density of dislocations, which is produced by a single shock, induces local three-dimensional pile-up by the multiple-shocks, which causes grain refinement at the nanoscale.

  3. Iron-sulfide redox flow batteries

    DOE Patents [OSTI]

    Xia, Guan-Guang; Yang, Zhenguo; Li, Liyu; Kim, Soowhan; Liu, Jun; Graff, Gordon L

    2013-12-17T23:59:59.000Z

    Iron-sulfide redox flow battery (RFB) systems can be advantageous for energy storage, particularly when the electrolytes have pH values greater than 6. Such systems can exhibit excellent energy conversion efficiency and stability and can utilize low-cost materials that are relatively safer and more environmentally friendly. One example of an iron-sulfide RFB is characterized by a positive electrolyte that comprises Fe(III) and/or Fe(II) in a positive electrolyte supporting solution, a negative electrolyte that comprises S.sup.2- and/or S in a negative electrolyte supporting solution, and a membrane, or a separator, that separates the positive electrolyte and electrode from the negative electrolyte and electrode.

  4. Thin Wall Cast Iron: Phase II

    SciTech Connect (OSTI)

    Doru M. Stefanescu

    2005-07-21T23:59:59.000Z

    The development of thin-wall technology allows the designers of energy consuming equipment to select the most appropriate material based on cost/material properties considerations, and not solely on density. The technology developed in this research project will permit the designers working for the automotive industry to make a better informed choice between competing materials and thin wall cast iron, thus decreasing the overall cost of the automobile.

  5. Synthesis, characterization and magnetic properties of a manganese (II) silicate containing frustrated S=5/2 zig–zag ladders

    SciTech Connect (OSTI)

    Brandão, P., E-mail: pbrandao@ua.pt [Departamento de Qímica/CICECO, Universidade de Aveiro, 3810-193 Aveiro (Portugal); Santos, A.M. dos [Quantum Condensed Matter Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6475 (United States); Paixão, L.S.; Reis, M.S. [Instituto de Física, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza s/n, 24210-346 Niterói, RJ (Brazil)

    2014-03-15T23:59:59.000Z

    The hydrothermal synthesis, structural characterization and magnetic properties of a manganese silicate with ideal formula of NaMn{sub 2}Si{sub 3}O{sub 8}(OH) is reported. This compound is a synthetic analog to the naturally occurring mineral Serandite. The crystal structure comprises MnO{sub 6} octahedra and SiO{sub 4} tetrahedra. The MnO{sub 6} share four edges with neighboring octahedra forming double chains. These chains are connected by silicate chains Si{sub 3}O{sub 8}(OH) resulting in an open framework structure with six-member ring channels where sodium ions are located. From the magnetic point of view, the intra-chain exchange between neighboring S=5/2 manganese ions is weak, partly due to the distortion observed in the octahedra, but also due to the frustrated topology of the chain. A successful fitting of the magnetic susceptibility was obtained by considering a double chain numerical model with Monte Carlo derived empirical parameters. -- Graphical abstract: A manganese silicate prepared hydrothermally with formula NaMn{sub 2}Si{sub 3}O{sub 8}(OH) possessing the structure of the mineral Serandite contains doubled chains of edge-sharing MnO{sub 6} octahedra. The magnetic susceptibility was measured and shows an antiferromagnetic behavior. Highlights: • Characterization of a synthetic analog to the mineral Serandite: NaMn{sub 2}Si{sub 3}O{sub 8}(OH). • Fitting of the magnetic susceptibility considering a classical regular chain. • Weak metal–oxygen–metal super-exchange interactions; antiferromagnetic in nature. • Elevated degree of frustration along the chain, without sign of interchain ordering.

  6. Role of microbial iron reduction in the dissolution of iron hydroxysulfate minerals - article no. G01012

    SciTech Connect (OSTI)

    Jones, E.J.P.; Nadeau, T.L.; Voytek, M.A.; Landa, E.R. [US Geological Survey, Reston, VA (United States)

    2006-03-28T23:59:59.000Z

    Reduction of structural sulfate in the iron-hydroxysulfate mineral jarosite by sulfate-reducing bacteria has previously been demonstrated. The primary objective of this work was to evaluate the potential for anaerobic dissolution of the iron-hydroxysulfate minerals jarosite and schwertmannite at neutral pH by iron-reducing bacteria. Mineral dissolution was tested using a long-term cultivar, Geobacter metallireducens strain GS-15, and a fresh isolate Geobacter sp. strain ENN1, previously undescribed. ENN1 was isolated from the discharge site of Shadle Mine, in the southern anthracite coalfield of Pennsylvania, where schwertmannite was the predominant iron-hydroxysulfate mineral. When jarosite from Elizabeth Mine (Vermont) was provided as the sole terminal electron acceptor, resting cells of both G. metallireducens and ENN1 were able to reduce structural Fe(III), releasing Fe{sup +2}, SO{sub 4}{sup -2}, and K{sup +} ions. A lithified jarosite sample from Utah was more resistant to microbial attack, but slow release of Fe{sup +2} was observed. Neither bacterium released Fe{sup +2} from poorly crystalline synthetic schwertmannite. Our results indicate that exposure of jarosite to iron-reducing conditions at neutral pH is likely to promote the mobility of hazardous constituents and should therefore be considered in evaluating waste disposal and/or reclamation options involving jarosite-bearing materials.

  7. Seal welded cast iron nuclear waste container

    DOE Patents [OSTI]

    Filippi, Arthur M. (Pittsburgh, PA); Sprecace, Richard P. (Murrysville, PA)

    1987-01-01T23:59:59.000Z

    This invention identifies methods and articles designed to circumvent metallurgical problems associated with hermetically closing an all cast iron nuclear waste package by welding. It involves welding nickel-carbon alloy inserts which are bonded to the mating plug and main body components of the package. The welding inserts might be bonded in place during casting of the package components. When the waste package closure weld is made, the most severe thermal effects of the process are restricted to the nickel-carbon insert material which is far better able to accommodate them than is cast iron. Use of nickel-carbon weld inserts should eliminate any need for pre-weld and post-weld heat treatments which are a problem to apply to nuclear waste packages. Although the waste package closure weld approach described results in a dissimilar metal combination, the relative surface area of nickel-to-iron, their electrochemical relationship, and the presence of graphite in both materials will act to prevent any galvanic corrosion problem.

  8. Spatially resolved characterization of biogenic manganese oxideproduction within a bacterial biofilm

    SciTech Connect (OSTI)

    Toner, Brandy; Fakra, Sirine; Villalobos, Mario; Warwick, Tony; Sposito, Garrison

    2004-10-01T23:59:59.000Z

    Pseudomonas putida strain MnB1, a biofilm forming bacteria, was used as a model for the study of bacterial Mn oxidation in freshwater and soil environments. The oxidation of Mn{sub (aq)}{sup +2} by P. putida was characterized by spatially and temporally resolving the oxidation state of Mn in the presence of a bacterial biofilm using scanning transmission x-ray microscopy (STXM) combined with near edge x-ray absorption fine structure (NEXAFS) spectroscopy at the Mn-L{sub 2,3} absorption edges. Subsamples were collected from growth flasks containing 0.1 mM and 1 mM total Mn at 16, 24, 36 and 48 hours after inoculation. Immediately after collection, the unprocessed hydrated subsamples were imaged at 40 nm resolution. Manganese NEXAFS spectra were extracted from x-ray energy sequences of STXM images (stacks) and fit with linear combinations of well characterized reference spectra to obtain quantitative relative abundances of Mn(II), Mn(III) and Mn(IV). Careful consideration was given to uncertainty in the normalization of the reference spectra, choice of reference compounds, and chemical changes due to radiation damage. The STXM results confirm that Mn{sub (aq)}{sup +2} was removed from solution by P. putida and was concentrated as Mn(III) and Mn(IV) immediately adjacent to the bacterial cells. The Mn precipitates were completely enveloped by bacterial biofilm material. The distribution of Mn oxidation states was spatially heterogeneous within and between the clusters of bacterial cells. Scanning transmission x-ray microscopy is a promising tool to advance the study of hydrated interfaces between minerals and bacteria, particularly in cases where the structure of bacterial biofilms needs to be maintained.

  9. Mixed metal films with switchable optical properties

    SciTech Connect (OSTI)

    Richardson, Thomas J.; Slack, Jonathan L.; Farangis, Baker; Rubin, Michael D.

    2001-10-16T23:59:59.000Z

    Thin, Pd-capped metallic films containing magnesium and first row transition metals (Mn, Fe, Co) switch reversibly from their initial reflecting state to visually transparent states when exposed to gaseous hydrogen or following cathodic polarization in an alkaline electrolyte. Reversion to the reflecting state is achieved by exposure to air or by anodic polarization. The films were prepared by co-sputtering from one magnesium target and one manganese, iron, or cobalt target. Both the dynamic optical switching range and the speed of the transition depend on the magnesium-transition metal ratio. Infrared spectra of films in the transparent, hydrided (deuterided) states support the presence of the intermetallic hydride phases Mg3MnH7, Mg2FeH6, and Mg2CoH5.

  10. Structural implications of the C-terminal tail in the catalytic and stability properties of manganese peroxidases from ligninolytic fungi

    SciTech Connect (OSTI)

    Fernández-Fueyo, Elena [CSIC, Ramiro de Maeztu 9, 28040 Madrid (Spain); Acebes, Sandra [Barcelona Supercomputing Center, Jordi Girona 29, 08034 Barcelona (Spain); Ruiz-Dueñas, Francisco J.; Martínez, María Jesús; Romero, Antonio; Medrano, Francisco Javier, E-mail: fjmedrano@cib.csic.es [CSIC, Ramiro de Maeztu 9, 28040 Madrid (Spain); Guallar, Victor, E-mail: fjmedrano@cib.csic.es [Barcelona Supercomputing Center, Jordi Girona 29, 08034 Barcelona (Spain); ICREA, Passeig Lluís Companys 23, 08010 Barcelona (Spain); Martínez, Angel T., E-mail: fjmedrano@cib.csic.es [CSIC, Ramiro de Maeztu 9, 28040 Madrid (Spain)

    2014-12-01T23:59:59.000Z

    The variable C-terminal tail of manganese peroxidases, a group of enzymes involved in lignin degradation, is implicated in their catalytic and stability properties, as shown by new crystal structures, molecular-simulation and directed-mutagenesis data. Based on this structural–functional evaluation, short and long/extralong manganese peroxidase subfamilies have been accepted; the latter are characterized by exceptional stability, while it is shown for the first time that the former are able to oxidize other substrates at the same site where manganese(II) is oxidized. The genome of Ceriporiopsis subvermispora includes 13 manganese peroxidase (MnP) genes representative of the three subfamilies described in ligninolytic fungi, which share an Mn{sup 2+}-oxidation site and have varying lengths of the C-terminal tail. Short, long and extralong MnPs were heterologously expressed and biochemically characterized, and the first structure of an extralong MnP was solved. Its C-terminal tail surrounds the haem-propionate access channel, contributing to Mn{sup 2+} oxidation by the internal propionate, but prevents the oxidation of 2, 2?-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS), which is only oxidized by short MnPs and by shortened-tail variants from site-directed mutagenesis. The tail, which is anchored by numerous contacts, not only affects the catalytic properties of long/extralong MnPs but is also associated with their high acidic stability. Cd{sup 2+} binds at the Mn{sup 2+}-oxidation site and competitively inhibits oxidation of both Mn{sup 2+} and ABTS. Moreover, mutations blocking the haem-propionate channel prevent substrate oxidation. This agrees with molecular simulations that position ABTS at an electron-transfer distance from the haem propionates of an in silico shortened-tail form, while it cannot reach this position in the extralong MnP crystal structure. Only small differences exist between the long and the extralong MnPs, which do not justify their classification as two different subfamilies, but they significantly differ from the short MnPs, with the presence/absence of the C-terminal tail extension being implicated in these differences.

  11. Iron phosphate compositions for containment of hazardous metal waste

    DOE Patents [OSTI]

    Day, D.E.

    1998-05-12T23:59:59.000Z

    An improved iron phosphate waste form for the vitrification, containment and long-term disposition of hazardous metal waste such as radioactive nuclear waste is provided. The waste form comprises a rigid iron phosphate matrix resulting from the cooling of a melt formed by heating a batch mixture comprising the metal waste and a matrix-forming component. The waste form comprises from about 30 to about 70 weight percent P{sub 2}O{sub 5} and from about 25 to about 50 weight percent iron oxide and has metals present in the metal waste chemically dissolved therein. The concentration of iron oxide in the waste form along with a high proportion of the iron in the waste form being present as Fe{sup 3+} provide a waste form exhibiting improved chemical resistance to corrosive attack. A method for preparing the improved iron phosphate waste forms is also provided. 21 figs.

  12. Iron phosphate compositions for containment of hazardous metal waste

    DOE Patents [OSTI]

    Day, Delbert E. (Rolla, MO)

    1998-01-01T23:59:59.000Z

    An improved iron phosphate waste form for the vitrification, containment and long-term disposition of hazardous metal waste such as radioactive nuclear waste is provided. The waste form comprises a rigid iron phosphate matrix resulting from the cooling of a melt formed by heating a batch mixture comprising the metal waste and a matrix-forming component. The waste form comprises from about 30 to about 70 weight percent P.sub.2 O.sub.5 and from about 25 to about 50 weight percent iron oxide and has metals present in the metal waste chemically dissolved therein. The concentration of iron oxide in the waste form along with a high proportion of the iron in the waste form being present as Fe.sup.3+ provide a waste form exhibiting improved chemical resistance to corrosive attack. A method for preparing the improved iron phosphate waste forms is also provided.

  13. The effect of modifications of dietary fat, fiber and sodium with magnesium deficiency on serum lipids and minerals, tissue and femur minerals and femur load force 

    E-Print Network [OSTI]

    Howe, Cathlyn Ann

    1992-01-01T23:59:59.000Z

    THE EFFECT OF MODIFICATIONS OF DIETARY FAT, FIBER AND SODIUM WITH MAGNESIUM DEFICIENCY ON SERUM LIPIDS AND MINERALS, TISSUE AND FEMUR MINERALS AND FEMUR LOAD FORCE A Thesis by CATHLYN ANN HOWE "Submitted to the Office of Graduate Studies oz..." Texas A&M University partial fulfillment of the requirements for the degree of MASTER OF SCIENCE December 1992 Major Subject: Nutrition THE EFFECTS OF MODIFICATIONS OF DIETARY FAT, FIBER AND SODIUM WITH MAGNESIUM DEFICIENCY ON SERUM LIPIDS...

  14. Mineral interactions and absorption in the equine digestive tract: calcium, phosphorus, and magnesium interaction with aluminum, and calcium digestibility of alfalfa in ponies 

    E-Print Network [OSTI]

    Kapusniak, Linda J.

    1987-01-01T23:59:59.000Z

    MINERAL INTERACTIONS AND ABSORPTION IN THE EQUINE DIGESTIVE TRACT: CALCIUM, PHOSPHORUS, AND MAGNESIUM INTERACTION WITH ALUMINUM, AND CALCIUM DIGESTIBILITY OF ALFALFA IN PONIES A Thesis by LINDA J. KAPUSN IAK Subnitted to the Graduate College... of Texas ARM University. in partial fulfillment of the requirenent for the degree of MASTER OF SCIENCE August 1987 Major Subject: Nutrition MINERAL INTER4CTIONS AND ABSORPTION IN THE EQUINE DIGESTIVE TR4CT: C4LCIUM, PHOSPHORUS, AND MAGNESIUM...

  15. An experimental investigation of the effect of sodium chloride on talc solubility and complexing of aqueous magnesium in supercritical hydrothermal fluids 

    E-Print Network [OSTI]

    Grabman, Kenneth Bryan

    1989-01-01T23:59:59.000Z

    AN EXPERIMENTAL INVESTIGATION OF THE EFFECT OF SODIUM CHLORIDE ON TALC SOLUBILITY AND COMPLEXING OF AQUEOUS MAGNESIUM IN SUPERCRITICAL HYDROTHERMAL FLUIDS A Thesis by KENNETH BRYAN GRABMAN Submitted to the Office of Graduate Studies of Texas... MAGNESIUM IN SUPERCRITICAL HYDROTHERMAL FLUIDS A Thesis by KENNETH BRYAN GRABMAN Approved as to style and content by: ~A. Robert K. Popp (Ch of Commi ee) Andrew Haj sh, Jr. (Member) Brann J son (Me ) J Span (Head o Department) December 1989...

  16. Iron Networks Microsoft Fast Track Architecture Reference Architecture Technical White Paper

    E-Print Network [OSTI]

    Chaudhuri, Surajit

    Iron Networks Microsoft Fast Track Architecture Reference Architecture Technical White Paper Iron://www.ironnetworks.com #12;Iron Networks IronPOD Fast Track Hyper-V Private Cloud - 2 Copyright©2014 Iron-V Private Cloud - 3 Contents 1 Introduction

  17. Hepcidin Is Involved in Iron Regulation in the Ischemic Brain

    E-Print Network [OSTI]

    Ding, Hui; Yan, Cai-Zhen; Shi, Honglian; Zhao, Ya-Shuo; Chang, Shi-Yang; Yu, Peng; Wu, Wen_Shuang; Zhao, Chen-Yang; Chang, Yan-Zhong; Duan, Xiang-Lin

    2011-09-21T23:59:59.000Z

    : #2; 2011 Ding et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source... an important role in the management of iron metabolism. Accumulated evidence suggests that the transferrin– transferrin receptor (Tf–TfR) pathway might be the major route of iron transport across the luminal membrane of the capillary endothelium and iron uptake...

  18. Reduction and carburization reactions in the iron bath smelter

    SciTech Connect (OSTI)

    Uemura, Kenichiro

    1993-01-01T23:59:59.000Z

    Slag-metal-coal reactions in the iron-bath smelter were analyzed based on a reaction model. It was concluded that the productivity and carbon content of the hot metal produced in a smelter can be controlled by adjusting the slag volume and iron oxide content in slag. Furthermore, iron oxide content is determined by the slag volume and the stirring intensity of the slag.

  19. Australian Mining carries rare-earth-like iron release | The...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Australian Mining carries rare-earth-like iron release Australian Mining, the leading news source for the mining industry in Australia, carried a story on research Ames Lab...

  20. Influence of Iron Redox Transformations on Plutonium Sorption...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    and Pu(V) reduction demonstrates the potential impact of changing iron mineralogy on plutonium subsurface transport through redox transition areas. These findings...

  1. Zero Valent Iron: Impact of Anions Present during Synthesis on...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    iron nanoparticles was quantified by monitoring the kinetics as well as products of carbon tetrachloride reduction, and significant differences in reactivity and chloroform...

  2. Microstructural Modification of a Cast Iron by Magnetic Field Processing

    SciTech Connect (OSTI)

    Kenik, Edward A [ORNL; Ludtka, Gail Mackiewicz- [ORNL; Ludtka, Gerard Michael [ORNL; Wilgen, John B [ORNL; Kisner, Roger A [ORNL

    2010-01-01T23:59:59.000Z

    The current study deals with the microstructural modification of a nodular cast iron during solidification under the influence of high magnetic fields (up to 18 tesla).

  3. Mineral Precipitation Upgradient from a Zero-Valent Iron Permeable...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Abstract: Core samples taken from a zero-valent iron permeable reactive barrier (ZVI PRB) at Cornhusker Army Ammunition Plant, Nebraska, were analyzed for physical and chemical...

  4. Demonstration of Combined Zero-Valent Iron and Electrical Resistance...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    and M Oostrom.2011."Demonstration of Combined Zero-Valent Iron and Electrical Resistance Heating for In Situ Trichloroethene Remediation."Environmental Science & Technology...

  5. Percolation Explains How Earth's Iron Core Formed | Stanford...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    history. Earth's present layered structure with a metallic core and an overlying silicate mantle would have required mechanisms to separate iron alloy from a silicate phase....

  6. The Fate of Bioavailable Iron in Antarctic Coastal Seas | Advanced...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    of iron mirrors the distribution of silicon. Science is exploring many options for carbon dioxide sequestration in order to mitigate the climatological impact of CO2. One of...

  7. approved iron nanoparticles: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    thickness on magnetic interactions in self-assembled single domain iron nanoparticles Materials Science Websites Summary: of Mechanical and Chemical Engineering, North Carolina...

  8. Argonne scientists discover new magnetic phase in iron-based...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    neutron diffraction image giving evidence for the new magnetic phase in iron-based superconductors discovered by Argonne scientists. It shows the scattering results from a sample...

  9. Metal regeneration of iron chelates in nitric oxide scrubbing

    DOE Patents [OSTI]

    Chang, Shih-Ger (El Cerrito, CA); Littlejohn, David (Oakland, CA); Shi, Yao (Berkeley, CA)

    1997-08-19T23:59:59.000Z

    The present invention relates to a process of using metal particles to reduce NO to NH.sub.3. More specifically, the invention concerns an improved process to regenerate iron (II) (CHELATE) by reduction of iron (II) (CHELATE) (NO) complex, which process comprises: a) contacting an aqueous solution containing iron (II) (CHELATE) (NO) with metal particles at between about 20.degree. and 90.degree. C. to reduce NO present, produce ammonia or an ammonium ion, and produce free iron (II) (CHELATE) at a pH of between about 3 and 8. The process is useful to remove NO from flue gas and reduce pollution.

  10. Metal regeneration of iron chelates in nitric oxide scrubbing

    DOE Patents [OSTI]

    Chang, S.G.; Littlejohn, D.; Shi, Y.

    1997-08-19T23:59:59.000Z

    The present invention relates to a process of using metal particles to reduce NO to NH{sub 3}. More specifically, the invention concerns an improved process to regenerate iron (II) (CHELATE) by reduction of iron (II) (CHELATE) (NO) complex, which process comprises: (a) contacting an aqueous solution containing iron (II) (CHELATE) (NO) with metal particles at between about 20 and 90 C to reduce NO present, produce ammonia or an ammonium ion, and produce free iron (II) (CHELATE) at a pH of between about 3 and 8. The process is useful to remove NO from flue gas and reduce pollution. 34 figs.

  11. Iron Speciation and Mixing in Single Aerosol Particles from the...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    iron from atmospheric aerosol is an essential nutrient that can control oceanic productivity, thereby impacting the global carbon budget and climate. Particles collected on...

  12. Beyond iron: non-classical biological functions of bacterial siderophores

    E-Print Network [OSTI]

    Nolan, Elizabeth M.

    Bacteria secrete small molecules known as siderophores to acquire iron from their surroundings. For over 60 years, investigations into the bioinorganic chemistry of these molecules, including fundamental coordination ...

  13. Climate VISION: Private Sector Initiatives: Iron and Steel: Resources...

    Office of Scientific and Technical Information (OSTI)

    Publications The Industrial Technologies Program offers a wide array of publications, videos, software, and other information products for improving energy efficiency in the iron...

  14. The effects of copper and iron deficiencies in the chick

    E-Print Network [OSTI]

    McGhee, Flin Cameron

    1964-01-01T23:59:59.000Z

    was assimilated by the chick. Cunningham (1931) and Josephs (1932) found that rats fed a milk diet plus iron showed no significant difference from rats fed milk plus sources of copper and iron. Elvehjem and Sherman (1932) reported that when rats de- ficient.../or iron as follows: Group Group Group Group Group Group 1 ? no added copper or iron 2 - cupric sulfate added (5 ppm) 3 - cupric oxide added (5 ppm) 4 ? ferrous sulfate added (40 ppm) 5 - cupric sulfate (5 ppm) plus ferrous sulfate added (40 ppm...

  15. Formation of iron complexs from trifluoroacetic acid based liquid...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Instead these ions are clusters of trifluoroacetic acid formed in association with acetonitrile, water and iron from the stainless steel union used to connect the column with the...

  16. Iron is the Key to Preserving Dinosaur Soft Tissue

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12 Investigation Peer Review 2012IowaFebruaryIronIronIronIron

  17. Preparation of anionic clay-birnessite manganese oxide composites by interlayer oxidation of oxalate ions by permanganate

    SciTech Connect (OSTI)

    Arulraj, James [Materials Research Group, Department of Chemistry, St. Joseph's College, 36 Langford Road, Bangalore 560 027 (India)] [Materials Research Group, Department of Chemistry, St. Joseph's College, 36 Langford Road, Bangalore 560 027 (India); Rajamathi, Michael, E-mail: mikerajamathi@rediffmail.com [Materials Research Group, Department of Chemistry, St. Joseph's College, 36 Langford Road, Bangalore 560 027 (India)] [Materials Research Group, Department of Chemistry, St. Joseph's College, 36 Langford Road, Bangalore 560 027 (India)

    2013-02-15T23:59:59.000Z

    Oxalate intercalated anionic clay-like nickel zinc hydroxysalt was obtained starting from nickel zinc hydroxyacetate, Ni{sub 3}Zn{sub 2}(OH){sub 8}(OAc){sub 2}{center_dot}2H{sub 2}O, by anion exchange. The intercalated oxalate species was reacted with potassium permanganate in such a way that the layered manganese oxide formed was within the interlayer region of the anionic clay resulting in a layered composite in which the negative charges on the birnessite type manganese oxide layers compensate the positive charges on the anionic clay layers. Birnessite to anionic clay ratio could be varied by varying the reaction time or the amount of potassium permanganate used. - Graphical abstract: Nickel zinc hydroxyoxalate was reacted with potassium permanganate to get nickel zinc hydroxide birnessite composites in which the positive charges on the hydroxide layers are neutralized by the negative charges on birnessite layers. Highlights: Black-Right-Pointing-Pointer Anionic and cationic layered solid composites prepared. Black-Right-Pointing-Pointer Ni-Zn hydroxyoxalate reacted with KMnO{sub 4} to deposit MnO{sub 2} in the interlayer. Black-Right-Pointing-Pointer Birnessite layers coexist with anionic clay layers in the composites. Black-Right-Pointing-Pointer Birnessite/anionic clay ratio controlled by amount of KMnO{sub 4} used and reaction time.

  18. Manganese reduction/oxidation reaction on graphene composites as a reversible process for storing enormous energy at a fast rate

    E-Print Network [OSTI]

    Chen, Yanyi; Shi, Shan; Li, Jia; Kang, Feiyu; Wei, Chunguang

    2014-01-01T23:59:59.000Z

    Oxygen reduction/evolution reaction (ORR/OER) is a basic process for fuel cells or metal air batteries. However, ORR/OER generally requires noble metal catalysts and suffers from low solubility (10-3 molar per liter) of O2, low kinetics rate (10-6 cm2/s) and low reversibility. We report a manganese reduction/oxidation reaction (MRR/MOR) on graphene/MnO2 composites, delivering a high capacity (4200 mAh/g), fast kinetics (0.0024 cm2/s, three orders higher than ORR/OER), high solubility (three orders than O2), and high reversibility (100%). We further use MRR/MOR to invent a rechargeable manganese ion battery (MIB), which delivers an energy density of 1200 Wh/Kg (several times of lithium ion battery), a fast charge ability (3 minutes), and a long cycle life (10,000 cycles). MRR/MOR renders a new class of energy conversion or storage systems with a very high energy density enabling electric vehicles run much more miles at one charge.

  19. Electrodeposited Manganese Oxides on Three-Dimensional Carbon Nanotube Substrate: Supercapacitive Behaviour in Aqueous and Organic Electrolytes

    SciTech Connect (OSTI)

    Nam,K.W.; Yang,X.

    2009-03-01T23:59:59.000Z

    Thin amorphous manganese oxide layers with a thickness of 3-5nm are electrodeposited on a carbon nanotube (CNT) film substrate that has a three-dimensional nanoporous structure (denoted asMnO2/CNT electrode). For the purpose of comparison, manganese oxide films are also electrodeposited on a flat Pt-coated Si wafer substrate (denoted as MnO2 film electrode). The pseudocapacitive properties of the MnO2 film and MnO2/CNT electrodes are examined in both aqueous electrolyte (1.0M KCl) and nonaqueousorganic electrolyte (1.0M LiClO4 in propylene carbonate). While both types of electrode showpseudocapacitive behaviour in the aqueous electrolyte, only the MnO2/CNT electrode does so in the organic electrolyte, due to its high oxide/electrolyte interfacial area and improved electron conduction through the CNT substrate. Compared with the MnO2 film electrode, the MnO2/CNT electrode shows a much higher specific capacitance and better high-rate capability, regardless of the electrolyte used.Use of the organic electrolyte results in a ?6 times higher specific energy compared with that obtained with the aqueous electrolyte, while maintaining a similar specific power. The construction of a threedimensional nanoporous network structure consisting of a thin oxide layer on a CNT film substrate at the nm scale and the use of an organic electrolyte are promising approaches to improving the specific energyof supercapacitors.

  20. Iron-Air Rechargeable Battery: A Robust and Inexpensive Iron-Air Rechargeable Battery for Grid-Scale Energy Storage

    SciTech Connect (OSTI)

    None

    2010-10-01T23:59:59.000Z

    GRIDS Project: USC is developing an iron-air rechargeable battery for large-scale energy storage that could help integrate renewable energy sources into the electric grid. Iron-air batteries have the potential to store large amounts of energy at low cost—iron is inexpensive and abundant, while oxygen is freely obtained from the air we breathe. However, current iron-air battery technologies have suffered from low efficiency and short life spans. USC is working to dramatically increase the efficiency of the battery by placing chemical additives on the battery’s iron-based electrode and restructuring the catalysts at the molecular level on the battery’s air-based electrode. This can help the battery resist degradation and increase life span. The goal of the project is to develop a prototype iron-air battery at significantly cost lower than today’s best commercial batteries.

  1. Displacement of the proton in hydrogen-bonded complexes of hydrogen fluoride by beryllium and magnesium ions

    SciTech Connect (OSTI)

    McDowell, Sean A. C. [Department of Biological and Chemical Sciences, University of the West Indies, Cave Hill Campus (Barbados)

    2009-05-14T23:59:59.000Z

    The displacement of the proton by a beryllium ion and by a magnesium ion from hydrogen-bonded complexes of hydrogen fluoride, of varying hydrogen bond strengths, was investigated theoretically using ab initio methods. Stable metal-containing species were obtained from all of the hydrogen-bonded complexes regardless of the strength of the hydrogen bond. It was found that the beryllium ion was energetically very effective in displacing the proton from hydrogen bonds, whereas the magnesium ion was unable to do so. The high stability of the beryllium-containing complexes is mainly due to the strong electrostatic bonding between the beryllium and fluoride atoms. This work supports the recent finding from a multidisciplinary bioinorganic study that beryllium displaces the proton in many strong hydrogen bonds.

  2. Abnormal macropore formation during double-sided gas tungsten arc welding of magnesium AZ91D alloy

    SciTech Connect (OSTI)

    Shen Jun [College of Mechanical Engineering, Chongqing University, Chongqing 400044 (China)], E-mail: shenjun2626@163.com; You Guoqiang; Long Siyuan [College of Mechanical Engineering, Chongqing University, Chongqing 400044 (China); Pan Fusheng [College of Material Science and Engineering, Chongqing University, Chongqing 400044 (China)

    2008-08-15T23:59:59.000Z

    One of the major concerns during gas tungsten arc (GTA) welding of cast magnesium alloys is the presence of large macroporosity in weldments, normally thought to occur from the presence of gas in the castings. In this study, a double-sided GTA welding process was adopted to join wrought magnesium AZ91D alloy plates. Micropores were formed in the weld zone of the first side that was welded, due to precipitation of H{sub 2} as the mushy zone freezes. When the reverse side was welded, the heat generated caused the mushy zone in the initial weld to reform. The micropores in the initial weld then coalesced and expanded to form macropores by means of gas expansion through small holes that are present at the grain boundaries in the partially melted zone. Macropores in the partially melted zone increase with increased heat input, so that when a filler metal is used the macropores are smaller in number and in size.

  3. Effects of (Al,Ge) double doping on the thermoelectric properties of higher manganese silicides

    SciTech Connect (OSTI)

    Chen, Xi; Salta, Daniel; Zhang, Libin [Materials Science and Engineering Program, Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712 (United States); Weathers, Annie [Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712 (United States); Zhou, Jianshi; Goodenough, John B.; Shi, Li [Materials Science and Engineering Program, Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712 (United States); Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712 (United States)

    2013-11-07T23:59:59.000Z

    Experiments and analysis have been carried out to investigate the effects of Al and (Al,Ge) doping on the microstructure and thermoelectric properties of polycrystalline higher manganese silicide (HMS) samples, which were prepared by solid-state reaction, ball milling, and followed by spark plasma sintering. It has been found that Al doping effectively increases the hole concentration, which leads to an increase in the electrical conductivity and power factor. By introducing the second dopant Ge into Al-doped HMS, the electrical conductivity is increased, and the Seebeck coefficient is decreased as a result of further increased hole concentration. The peak power factor is found to occur at a hole concentration between 1.8?×?10{sup 21} and 2.2?×?10{sup 21}?cm{sup ?3} measured at room temperature. The (Al,Ge)-doped HMS samples show lower power factors owing to their higher hole concentrations. The mobility of Mn(Al{sub 0.0035}Ge{sub y}Si{sub 0.9965-y}){sub 1.8} with y?=?0.035 varies approximately as T{sup ?3/2} above 200?K, suggesting acoustic phonon scattering is the dominant scattering mechanism. The thermal conductivity of HMS does not change appreciably by Al or (Al,Ge) doping. The maximum ZT of (Al,Ge)-doped HMS is 0.57 at 823?K, which is similar to the highest value found in the Al-doped HMS samples. The ZT values were reduced in the Mn(Al{sub 0.0035}Ge{sub y}Si{sub 0.9965-y}){sub 1.8} samples with high Ge concentration of y?=?0.025 and 0.035, because of reduced power factor. In addition, a two-band model was employed to show that the hole contribution to the thermal conductivity dominates the bipolar and electron contributions for all samples from 300 to 823?K and accounts for about 12% of the total thermal conductivity at about 800?K.

  4. Correlation between structural, magnetic, and dielectric properties of manganese substituted cobalt ferrite

    SciTech Connect (OSTI)

    Ramana, C. V., E-mail: rvchintalapalle@utep.edu; Kolekar, Y. D.; Kamala Bharathi, K. [Department of Mechanical Engineering, University of Texas at El Paso, El Paso, Texas 79968 (United States); Sinha, B. [Functional Nanopowder Material Division, Korea Institute of Material Science, Changwon 642-831, Gyeongnam (Korea, Republic of); Ghosh, K. [Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, Missouri 65897 (United States)

    2013-11-14T23:59:59.000Z

    Manganese (Mn) substituted cobalt ferrites (CoFe{sub 2?x}Mn{sub x}O{sub 4}, referred to CFMO) were synthesized and their structural, magnetic, and dielectric properties were evaluated. X-ray diffraction measurements coupled with Rietveld refinement indicate that the CFMO materials crystallize in the inverse cubic spinel phase. Temperature (T?=?300?K and 10?K) dependent magnetization (M(H)) measurements indicate the long range ferromagnetic ordering in CoFe{sub 2?x}Mn{sub x}O{sub 4} (x?=?0.00–0.15) ferrites. The cubic anisotropy constant (K{sub 1}(T)) and saturation magnetization (M{sub s}(T)) were derived by using the “law of approach” to saturation that describes the field dependence of M(H) for magnetic fields much higher than the coercive field (H{sub c}). Saturation magnetization (M{sub s}), obtained from the model, decreases with increasing temperature. For CoFe{sub 2}O{sub 4}, M{sub s} decreases from 3.63??{sub B} per formula unit (f.u.) to 3.47??{sub B}/f.u. with increasing temperature from 10 to 300?K. CFMO (0.00–0.15) exhibit the similar trend while the magnitude of M{sub s} is dependent on Mn-concentration. M{sub s}-T functional relationship obeys the Bloch's law. The lattice parameter and magnetic moment calculated for CFMO reveals that Mn ions occupying the Fe and Co position at the octahedral site in the inverse cubic spinel phase. The structure and magnetism in CFMO are further corroborated by bond length and bond angle calculations. The dielectric constant dispersion of CFMO in the frequency range of 20?Hz–1?MHz fits to the modified Debye's function with more than one ion contributing to the relaxation. The relaxation time and spread factor derived from modeling the experimental data are ?10{sup ?4}?s and ?0.35(±0.05), respectively.

  5. Suspension Hydrogen Reduction of Iron Oxide Concentrates

    SciTech Connect (OSTI)

    H.Y. Sohn

    2008-03-31T23:59:59.000Z

    The objective of the project is to develop a new ironmaking technology based on hydrogen and fine iron oxide concentrates in a suspension reduction process. The ultimate objective of the new technology is to replace the blast furnace and to drastically reduce CO2 emissions in the steel industry. The goals of this phase of development are; the performance of detailed material and energy balances, thermochemical and equilibrium calculations for sulfur and phosphorus impurities, the determination of the complete kinetics of hydrogen reduction and bench-scale testing of the suspension reduction process using a large laboratory flash reactor.

  6. Carbon Emissions: Iron and Steel Industry

    Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 111 1,613 122 40CoalLease(Billion2,128 2,469 2,321Spain (Million Cubic Feet)Iron and Steel

  7. Iron Availability in the Southern Ocean

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes | NationalCurriculum IntroductionInvestor14,566 SiteIron

  8. Kumba Iron Ore | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer Plant Jump to: navigation, search GEOTHERMALTexas:Kuju Kanko Hotel GeothermalKumba Iron Ore

  9. Iron Availability in the Southern Ocean

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12 Investigation Peer Review 2012IowaFebruary 9,JanuaryIron

  10. Iron Availability in the Southern Ocean

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12 Investigation Peer Review 2012IowaFebruaryIron Availability

  11. Iron Availability in the Southern Ocean

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12 Investigation Peer Review 2012IowaFebruaryIron

  12. Thermal chemistry of Mn{sub 2}(CO){sub 10} during deposition of thin manganese films on silicon oxide and on copper surfaces

    SciTech Connect (OSTI)

    Qin Xiangdong; Sun Huaxing; Zaera, Francisco [Department of Chemistry, University of California, Riverside, California 92521 (United States)

    2012-01-15T23:59:59.000Z

    The surface chemistry of dimanganese decacarbonyl on the native oxide of Si(100) wafers was characterized with the aid of x-ray photoelectron spectroscopy. Initial experiments in a small stainless-steel reactor identified a narrow range of temperatures, between approximately 445 and 465 K, in which the deposition of manganese could be achieved in a self-limiting fashion, as is desirable for atomic layer deposition. Deposition at higher temperatures leads to multilayer growth, but the extent of this Mn deposition reverses at even higher temperatures (about 625 K), and also ifhydrogen is added to the reaction mixture. Extensive decarbonylation takes place below room temperature, but limited C-O bond dissociation and carbon deposition are still seen after high exposures at 625 K. The films deposited at low ({approx}450 K) temperatures are mostly in the form of MnO, but at 625 K that converts to a manganese silicate, and upon higher doses a manganese silicide forms at the SiO{sub 2}/Si(100) interface as well. No metallic manganese could be deposited with this precursor on either silicon dioxide or copper surfaces.

  13. Atomic layer structure of manganese atoms on wurtzite gallium nitride Abhijit Chinchore, Kangkang Wang, Wenzhi Lin, Jeongihm Pak, and Arthur R. Smitha

    E-Print Network [OSTI]

    Atomic layer structure of manganese atoms on wurtzite gallium nitride ,,0001¯... Abhijit Chinchore on wurtzite GaN 0001¯ . The surface is monitored using reflection high energy electron diffraction, which to grow with an abrupt interface and well- defined epitaxial orientation on top of wurtzite w -GaN. Re

  14. A Large Manganese-doped Polyoxotitanate Nanocluster: Ti14MnO14(OH)2(OEt)28 Yang Chen,a

    E-Print Network [OSTI]

    Coppens, Philip

    containing titanium were stored and handled in a glove-box under a nitrogen atmosphere. Synthesis of Ti14Mn; Polyoxotitanate; Nanocluster; Crystal structure; Band gap. INTRODUCTION During the past decades, titanium dioxide as received: Titanium(IV) ethoxide (99+ %) was purchased from Alfa Aesar; manganese(III) acetate dihydrate (97

  15. Electrochemical properties of magnesium doped LiFePO{sub 4} cathode material prepared by sol–gel method

    SciTech Connect (OSTI)

    Zhao, Xiaohui; Baek, Dong-Ho; Manuel, James; Heo, Min-Yeong; Yang, Rong [Department of Chemical and Biological Engineering and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, 900, Gajwa-dong, Jinju 600-701 (Korea, Republic of)] [Department of Chemical and Biological Engineering and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, 900, Gajwa-dong, Jinju 600-701 (Korea, Republic of); Ha, Jong Keun; Ryu, Ho-Suk; Ahn, Hyo-Jun; Kim, Ki-Won [Department of Metallurgical Science and Engineering, Gyeongsang National University, 900, Gajwa-dong, Jinju 600-701 (Korea, Republic of)] [Department of Metallurgical Science and Engineering, Gyeongsang National University, 900, Gajwa-dong, Jinju 600-701 (Korea, Republic of); Cho, Kwon-Koo, E-mail: kkcho66@gnu.ac.kr [Department of Metallurgical Science and Engineering, Gyeongsang National University, 900, Gajwa-dong, Jinju 600-701 (Korea, Republic of)] [Department of Metallurgical Science and Engineering, Gyeongsang National University, 900, Gajwa-dong, Jinju 600-701 (Korea, Republic of); Ahn, Jou-Hyeon, E-mail: jhahn@gnu.ac.kr [Department of Chemical and Biological Engineering and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, 900, Gajwa-dong, Jinju 600-701 (Korea, Republic of)] [Department of Chemical and Biological Engineering and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, 900, Gajwa-dong, Jinju 600-701 (Korea, Republic of)

    2012-10-15T23:59:59.000Z

    Magnesium doped Li{sub 1?2x}Mg{sub x}FePO{sub 4}/C (x = 0.00, 0.01, 0.03, 0.05) cathode materials were synthesized by sol–gel method, and the effect of magnesium doping as well as its content on the electrochemical properties for lithium batteries was also investigated{sub .} Their morphology was studied with field emission scanning electron microscope and Li{sub 1?2x}Mg{sub x}FePO{sub 4} materials showed the olivine phase without impurities. The thin carbon layer of Li{sub 1?2x}Mg{sub x}FePO{sub 4}/C was confirmed by high resolution transmission electron microscopy. The magnesium doped Li{sub 1?2x}Mg{sub x}FePO{sub 4}/C particles were smaller than those undoped. The Li{sub 1?2x}Mg{sub x}FePO{sub 4}/C materials showed better cycling behavior than undoped LiFePO{sub 4}, especially at high C-rate in which Li{sub 0.94}Mg{sub 0.03}FePO{sub 4}/C composition exhibited the best electrochemical properties.

  16. Arsenic remediation of drinking water using iron-oxide coated coal bottom ash

    E-Print Network [OSTI]

    MATHIEU, JOHANNA L.

    2010-01-01T23:59:59.000Z

    using Iron-oxide Coated Coal Ash. In Arsenic Contaminationwater using  iron?oxide coated coal bottom ash  Johanna L.  using iron-oxide coated coal bottom ash JOHANNA L. MATHIEU

  17. Public good dynamics drive evolution of iron acquisition strategies in natural bacterioplankton populations

    E-Print Network [OSTI]

    Cordero, Otto X.

    A common strategy among microbes living in iron-limited environments is the secretion of siderophores, which can bind poorly soluble iron and make it available to cells via active transport mechanisms. Such siderophore–iron ...

  18. THE EFFECT OF SMECTITE ON THE CORROSION OF IRON METAL. | EMSL

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    THE EFFECT OF SMECTITE ON THE CORROSION OF IRON METAL. THE EFFECT OF SMECTITE ON THE CORROSION OF IRON METAL. Abstract: The combination of zero-valent iron and a clay-type...

  19. Electrically insulating phosphate coatings for iron powder based electromagnetic core applications

    E-Print Network [OSTI]

    Nolan, William Rane

    2009-01-01T23:59:59.000Z

    Powdered metals, such as iron, are a common building block for electromagnetic cores. An iron powder was reacted with phosphoric acid to create a layer of iron phosphate on each particle. This electrically insulating ...

  20. Moessbauer studies of iron hydride at high pressure

    SciTech Connect (OSTI)

    Choe, I.; Ingalls, R. (Department of Physics, FM-15, University of Washington, Seattle, Washington 98195 (USA)); Brown, J.M.; Sato-Sorensen, Y. (Geophysics Program, AK-50, University of Washington, Seattle, Washington 98195 (USA)); Mills, R. (Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (USA))

    1991-07-01T23:59:59.000Z

    We have measured {ital in} {ital situ} Moessbauer spectra of iron hydride made in a diamond anvil cell at high pressure and room temperature. The spectra show a sudden change at 3.5{plus minus}0.5 GPa from a single hyperfine pattern to a superposition of three. The former pattern results from normal {alpha}-iron with negligible hydrogen content, and the latter from residual {alpha}-iron plus newly formed iron hydride. Between 3.5 and 10.4 GPa, the extra hydride pattern have hyperfine fields for one ranging from 276 to 263 kOe, and the other, from 317 to 309 kOe. Both have isomer shifts of about 0.4 mm/sec, and negligible quadrupole splittings. X-ray studies on quenched samples have shown that iron hydride is of double hexagonal close-packed structure, whose two nonequivalent iron sites may account for the observation of two different patterns. Even allowing for the effect of volume expansion, the observed isomer shifts for the hydride are considerably more positive than those of other metallic phases of iron. At the same time, the hyperfine fields are slightly smaller than that of {alpha}-iron. As a possible explanation, one may expect a bonding of hydrogen with iron, which would result in a small reduction of 4{ital s} electrons, possibly accompanied by a small increase of 3{ital d} electrons compared with the neutral atom in metallic iron. The difference between the hyperfine fields in the two spectra are presumably due to the different symmetry at the two iron sites.

  1. Investigation of Iron Aluminide Weld Overlays

    SciTech Connect (OSTI)

    Banovic, S.W.; DuPont, J.B.; Levin, B.F.; Marder, A.R.

    1999-08-02T23:59:59.000Z

    Conventional fossil fired boilers have been retrofitted with low NO(sub)x burners in order for the power plants to comply with new clean air regulations. Due to the operating characteristics of these burners, boiler tube sulfidation corrosion typically has been enhanced resulting in premature tube failure. To protect the existing panels from accelerated attack, weld overlay coatings are typically being applied. By depositing an alloy that offers better corrosion resistance than the underlying tube material, the wastage rates can be reduced. While Ni-based and stainless steel compositions are presently providing protection, they are expensive and susceptible to failure via corrosion-fatigue due to microsegregation upon solidification. Another material system presently under consideration for use as a coating in the oxidation/sulfidation environments is iron-aluminum. These alloys are relatively inexpensive, exhibit little microsegregation, and show excellent corrosion resistance. However, their use is limited due to weldability issues and their lack of corrosion characterization in simulated low NO(sub)x gas compositions. Therefore a program was initiated in 1996 to evaluate the use of iron-aluminum weld overlay coatings for erosion/corrosion protection of boiler tubes in fossil fired boilers with low NO(sub)x burners. Investigated properties included weldability, corrosion behavior, erosion resistance, and erosion-corrosion performance.

  2. U.S. Department of the Interior U.S. Geological Survey

    E-Print Network [OSTI]

    Torgersen, Christian

    Lithium Magnesium Manganese Mercury Mica Molybdenum Nickel Nitrogen Peat Perlite Phosphate Rock Platinum..............................................................192 Appendix C--A Resource/Reserve Classification for Minerals

  3. Complement receptor type 2conjugated superparamagnetic iron oxide nanoparticles

    E-Print Network [OSTI]

    Levin, Judith G.

    Complement receptor type 2­conjugated superparamagnetic iron oxide nanoparticles [CR2-Fc-SPIO] Kam: Complement receptor type 2­conjugated gold/superparamagnetic iron oxide nanoparticles Abbreviated name: CR2, and oligodendroglial cells. SPIO nanoparticles are sometimes modified with dextran, poly(ethylene glycol) (PEG

  4. Enhanced Superconducting Properties of Iron Chalcogenide Thin Films

    E-Print Network [OSTI]

    Chen, Li

    2013-07-26T23:59:59.000Z

    Among the newly discovered iron-based superconductor, FeSe with the simplest structure and a transition temperature (T_c) around 8 K arouses much research interest. Although its Tc is much lower than that of the cuprates, iron chalcogenide has low...

  5. atmospheric iron corrosion: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    atmospheric iron corrosion First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Atmospheric Iron Deposition:...

  6. Degradation of organic and inorganic contaminants by zero valent iron

    E-Print Network [OSTI]

    Malla, Deepak Babu

    1997-01-01T23:59:59.000Z

    and in combination. All three target contaminants were effectively reduced by both iron (Feo) and palladized iron (Pd/Fe'). However, the rate of reduction by Pd/Fe' was found to be much faster than that by Feo. The reduction of all the contaminants in mixed waste...

  7. Electrodeposition of hybrid organicinorganic films containing iron oxide

    E-Print Network [OSTI]

    Niewczas, Marek

    Electrodeposition of hybrid organic­inorganic films containing iron oxide I. Zhitomirsky *, M has been developed for the preparation of hybrid organic­inorganic films containing iron oxide properties could be varied. Magnetic measurements revealed that the nanocomposite films are superparamagnetic

  8. MATHEMATICAL MODELING OF THE LITHIUM-ALUMINUM, IRON SULFIDE BATTERY. I. GALVONOSTATIC DISCHARGE BEHAVIOR

    E-Print Network [OSTI]

    Pollard, Richard

    2012-01-01T23:59:59.000Z

    composition profiles in lithium/sulfur battery analogues hasTHE LITHIUM-ALUMINUM, IRON SULFIDE BATTERY. I. GALVONOSTATICthe Lithium-Aluminum, Iron Sulfide Battery I. Galvanostatic

  9. Trophic status of Chlamydomonas reinhardtii influences the impact of iron deficiency on photosynthesis

    E-Print Network [OSTI]

    Terauchi, Aimee M.; Peers, Graham; Kobayashi, Marilyn C.; Niyogi, Krishna K.; Merchant, Sabeeha S.

    2010-01-01T23:59:59.000Z

    of iron de?ciency on photosynthesis Aimee M. Terauchi •rates by suppress- ing photosynthesis but increasing insteadal. 2007). In oxygenic photosynthesis, iron is a cofactor in

  10. Using Disorder to Study How Electrons Pair in Iron-Based Superconducto...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Using Disorder to Study How Electrons Pair in Iron-Based Superconductors Researchers introduced disorder to test electron pairing in iron-based superconductors and produced...

  11. Non-LTE Abundances of Magnesium, Aluminum and Sulfur in OB Stars Near the Solar Circle

    E-Print Network [OSTI]

    S. Daflon; K. Cunha; V. V. Smith; K. Butler

    2002-12-09T23:59:59.000Z

    Non-LTE abundances of magnesium, aluminum and sulfur are derived for a sample of 23 low-v \\sin i stars belonging to six northern OB associations of the Galactic disk within 1 kpc of the Sun. The abundances are obtained from the fitting of synthetic line profiles to high resolution spectra. A comparison of our results with HII region abundances indicates good agreement for sulfur while the cepheid abundances are higher. The derived abundances of Mg show good overlap with the cepheid results. The aluminum abundances for OB stars are significantly below the cepheid values. But, the OB star results show a dependence with effective temperature and need further investigation. The high Al abundances in the cepheids could be the result of mixing. A discussion of the oxygen abundance in objects near the solar circle suggests that the current mean galactic oxygen abundance in this region is 8.6-8.7 and in agreement with the recently revised oxygen abundance in the solar photosphere. Meaningful comparisons of the absolute S, Al and Mg abundances in OB stars with the Sun must await a reinvestigation of these elements, as well as the meteoritic reference element Si, with 3D hydrodynamical model atmospheres for the Sun. No abundance gradients are found within the limited range in galactocentric distances in the present study. Such variations would be expected only if there were large metallicity gradients in the disk.

  12. Polymer Stable Magnesium Nanocomposites Prepared by Laser Ablation for Efficient Hydrogen Storage

    E-Print Network [OSTI]

    Makridis, S S; Panagakos, G; Kikkinides, E S; Stubos, A K; Wagener, P; Barcikowski, S

    2013-01-01T23:59:59.000Z

    Hydrogen is a promising alternative energy carrier that can potentially facilitate the transition from fossil fuels to sources of clean energy because of its prominent advantages such as high energy density (142 MJ per kg), great variety of potential sources (for example water, biomass, organic matter), and low environmental impact (water is the sole combustion product). However, due to its light weight, the efficient storage of hydrogen is still an issue investigated intensely. Various solid media have been considered in that respect among which magnesium hydride stands out as a candidate offering distinct advantages. Recent theoretical work indicates that MgH2 becomes less thermodynamically stable as particle diameter decreases below 2 nm. Our DFT (density functional theory) modeling studies have shown that the smallest enthalpy change, corresponding to 2 unit-cell thickness (1.6 {\\AA} Mg/3.0{\\AA} MgH2) of the film, is 57.7 kJ/molMg. This enthalpy change is over 10 kJ per molMg smaller than that of the bulk...

  13. System and method for producing metallic iron nodules

    DOE Patents [OSTI]

    Bleifuss, Rodney L. (Grand Rapids, MN); Englund, David J. (Bovey, MN); Iwasaki, Iwao (Grand Rapids, MN); Lindgren, Andrew J. (Grand Rapids, MN); Kiesel, Richard F. (Hibbing, MN)

    2011-09-20T23:59:59.000Z

    A method for producing metallic iron nodules by assembling a shielding entry system to introduce coarse carbonaceous material greater than 6 mesh in to the furnace atmosphere at location(s) where the temperature of the furnace atmosphere adjacent at least partially reduced reducible iron bearing material is between about 2200 and 2650.degree. F. (1200 and 1450.degree. C.), the shielding entry system adapted to inhibit emission of infrared radiation from the furnace atmosphere and seal the furnace atmosphere from exterior atmosphere while introducing coarse carbonaceous material greater than 6 mesh into the furnace to be distributed over the at least partially reduced reducible iron bearing material, and heating the covered at least partially reduced reducible iron bearing material in a fusion atmosphere to assist in fusion and inhibit reoxidation of the reduced material during fusion to assist in fusion and inhibit reoxidation of the reduced material in forming metallic iron nodules.

  14. FeCycle: Attempting an iron biogeochemical budget from a mesoscale SF6 tracer experiment in unperturbed low iron waters

    E-Print Network [OSTI]

    Wilhelm, Steven W.

    FeCycle: Attempting an iron biogeochemical budget from a mesoscale SF6 tracer experiment to ocean physics. In summer 2003 we conducted FeCycle, a 10-day mesoscale tracer release in HNLC waters SE biogeochemical budget from a mesoscale SF6 tracer experiment in unperturbed low iron waters, Global Biogeochem

  15. Selective dissolution of magnetic iron oxides in the acidammonium oxalate/ferrous iron extraction method--I. Synthetic samples

    E-Print Network [OSTI]

    Utrecht, Universiteit

    for specific dissolution of magnetic minerals from soils and sediments. To prevent changes in the extractionSelective dissolution of magnetic iron oxides in the acid­ammonium oxalate/ferrous iron extraction the pedogenic magnetic fractions. Sequential extraction techniques have therefore been incorporated

  16. Linking local structure and properties in perovskites containing equal concentrations of manganese and ruthenium

    SciTech Connect (OSTI)

    King, Graham; Ricciardo, Rebecca A.; Soliz, Jennifer R.; Woodward, Patrick M.; Llobet, Anna (OSU); (LANL)

    2011-08-16T23:59:59.000Z

    The local structures of six perovskite compounds containing equal amounts of manganese and ruthenium on the B-site have been investigated by neutron and x-ray pair distribution function analysis. The compounds SrMn{sub 0.5}Ru{sub 0.5}O{sub 3}, Sr{sub 0.5}Ca{sub 0.5}Mn{sub 0.5}Ru{sub 0.5}O{sub 3}, and CaMn{sub 0.5}Ru{sub 0.5}O{sub 3} were studied to investigate the effects of pure chemical pressure on the local structure and valency ratio between Mn{sup 3+}/Ru{sup 5+} and Mn{sup 4+}/Ru{sup 4+}. Reverse Monte Carlo simulations confirm that there is a shift in the B-site cation charge distribution from nearly equal amounts of Mn{sup 3+}, Ru{sup 5+}, Mn{sup 4+}, and Ru{sup 4+} for SrMn{sub 0.5}Ru{sub 0.5}O{sub 3} to primarily Mn{sup 4+} and Ru{sup 4+} for CaMn{sub 0.5}Ru{sub 0.5}O{sub 3}. The compounds Ba{sub 0.5}La{sub 0.5}Mn{sub 0.5}Ru{sub 0.5}O{sub 3}, Ca{sub 0.5}La{sub 0.5}Mn{sub 0.5}Ru{sub 0.5}O{sub 3}, and Sr{sub 0.5}Ca{sub 0.25}La{sub 0.25}Mn{sub 0.5}Ru{sub 0.5}O{sub 3} were also investigated to study the effects of changing the charge of the A-site cation. Although substitution of La{sup 3+} for a divalent alkaline earth ion increases the Mn{sup 3+} content, this series of compounds also shows a relative increase in the concentration of Mn{sup 4+} as the average size of the A-site cation is decreased. In all compounds the octahedra containing Mn{sup 3+} are found to be Jahn-Teller distorted regardless of whether or not long-range orbital ordering is observed, while the Ru-centered octahedra are symmetric. No evidence for short-range cation ordering at either the A- or B-sites was found for any of the compositions. This study also reports that locally the A-site cations lie closer to the Mn ions than to the Ru ions and this asymmetry appears to be correlated to the degree of octahedral tilting.

  17. Structural Study of Biotic and Abiotic Poorly-crystalline Manganese Oxides Using Atomic Pair Distribution Function Analysis

    SciTech Connect (OSTI)

    Billinge S. J.; Zhu, M.; Farrow, C.L.; Post, J.E.; Livi, K.J.T.; Ginder-Vogel, M.; Sparks, D.L.

    2012-03-15T23:59:59.000Z

    Manganese (Mn) oxides are among the most reactive natural minerals and play an important role in elemental cycling in oceanic and terrestrial environments. A large portion of naturally-occurring Mn oxides tend to be poorly-crystalline and/or nanocrystalline, with not fully resolved crystal structures. In this study, the crystal structures of their synthetic analogs including acid birnessite (AcidBir), {delta}-MnO{sub 2}, polymeric MnO{sub 2} (PolyMnO{sub 2}) and a bacteriogenic Mn oxide (BioMnO{sub x}), have been revealed using atomic pair distribution function (PDF) analysis. Results unambiguously verify that these Mn oxides are layered materials. The best models that accurately allow simulation of pair distribution functions (PDFs) belong to the monoclinic C12/m1 space group with a disk-like shape. The single MnO{sub 6} layers in the average structures deviate significantly from hexagonal symmetry, in contrast to the results of previous studies based on X-ray diffraction analysis in reciprocal space. Manganese occupancies in MnO{sub 6} layers are estimated to be 0.936, 0.847, 0.930 and 0.935, for AcidBir, BioMnO{sub x}, {delta}-MnO{sub 2} and PolyMnO{sub 2}, respectively; however, occupancies of interlayer cations and water molecules cannot be accurately determined using the models in this study. The coherent scattering domains (CSDs) of PolyMnO{sub 2}, {delta}-MnO{sub 2} and BioMnO{sub x} are at the nanometer scale, comprising one to three MnO{sub 6} layers stacked with a high disorder in the crystallographic c-axis direction. Overall, the results of this study advance our understanding of the mineralogy of Mn oxide minerals in the environment.

  18. Structural study of biotic and abiotic poorly-crystalline manganese oxides using atomic pair distribution function analysis

    SciTech Connect (OSTI)

    Zhu, Mengqiang; Farrow, Christopher L.; Post, Jeffrey E.; Livi, Kenneth J.T.; Billinge, Simon J.L.; Ginder-Vogel, Matthew; Sparks, Donald L. (Delaware); (Columbia); (JHU); (Smithsonian)

    2012-03-15T23:59:59.000Z

    Manganese (Mn) oxides are among the most reactive natural minerals and play an important role in elemental cycling in oceanic and terrestrial environments. A large portion of naturally-occurring Mn oxides tend to be poorly-crystalline and/or nanocrystalline, with not fully resolved crystal structures. In this study, the crystal structures of their synthetic analogs including acid birnessite (AcidBir), {delta}-MnO{sub 2}, polymeric MnO{sub 2} (PolyMnO{sub 2}) and a bacteriogenic Mn oxide (BioMnO{sub x}), have been revealed using atomic pair distribution function (PDF) analysis. Results unambiguously verify that these Mn oxides are layered materials. The best models that accurately allow simulation of pair distribution functions (PDFs) belong to the monoclinic C12/m1 space group with a disk-like shape. The single MnO{sub 6} layers in the average structures deviate significantly from hexagonal symmetry, in contrast to the results of previous studies based on X-ray diffraction analysis in reciprocal space. Manganese occupancies in MnO{sub 6} layers are estimated to be 0.936, 0.847, 0.930 and 0.935, for AcidBir, BioMnOx, {delta}-MnO{sub 2} and PolyMnO{sub 2}, respectively; however, occupancies of interlayer cations and water molecules cannot be accurately determined using the models in this study. The coherent scattering domains (CSDs) of PolyMnO{sub 2}, {delta}-MnO{sub 2} and BioMnO{sub x} are at the nanometer scale, comprising one to three MnO{sub 6} layers stacked with a high disorder in the crystallographic c-axis direction. Overall, the results of this study advance our understanding of the mineralogy of Mn oxide minerals in the environment.

  19. Kinetics of dissolution and bio-availability of iron in amorphous siliceous iron oxides

    E-Print Network [OSTI]

    Seaman, John C.

    1990-01-01T23:59:59.000Z

    A&M University Chair of Advisory Committee: Dr. Richard H. Loeppert Amorphous iron (Fe) oxides are of interest because of their high reactivity, surface area, and influence on Fe availability in the soil environment. These materials may have... potential utilization as slow-release Fe amendments for calcareous soils. The objective of this study was to evaluate the impact of various concentrations of silicon (Si), present during precipitation, on the dissolution kinetics of amorphous Fe oxides...

  20. Multiple hearth furnace for reducing iron oxide

    DOE Patents [OSTI]

    Brandon, Mark M. (Charlotte, NC); True, Bradford G. (Charlotte, NC)

    2012-03-13T23:59:59.000Z

    A multiple moving hearth furnace (10) having a furnace housing (11) with at least two moving hearths (20) positioned laterally within the furnace housing, the hearths moving in opposite directions and each moving hearth (20) capable of being charged with at least one layer of iron oxide and carbon bearing material at one end, and being capable of discharging reduced material at the other end. A heat insulating partition (92) is positioned between adjacent moving hearths of at least portions of the conversion zones (13), and is capable of communicating gases between the atmospheres of the conversion zones of adjacent moving hearths. A drying/preheat zone (12), a conversion zone (13), and optionally a cooling zone (15) are sequentially positioned along each moving hearth (30) in the furnace housing (11).

  1. System and method for producing metallic iron

    DOE Patents [OSTI]

    Bleifuss, Rodney L; Englund, David J; Iwasaki, Iwao; Fosnacht, Donald R; Brandon, Mark M; True, Bradford G

    2013-09-17T23:59:59.000Z

    A hearth furnace for producing metallic iron material has a furnace housing having a drying/preheat zone, a conversion zone, a fusion zone, and optionally a cooling zone, the conversion zone is between the drying/preheat zone and the fusion zone. A moving hearth is positioned within the furnace housing. A hood or separation barrier within at least a portion of the conversion zone, fusion zone or both separates the fusion zone into an upper region and a lower region with the lower region adjacent the hearth and the upper region adjacent the lower region and spaced from the hearth. An injector introduces a gaseous reductant into the lower region adjacent the hearth. A combustion region may be formed above the hood or separation barrier.

  2. System and method for producing metallic iron

    DOE Patents [OSTI]

    Bleifuss, Rodney L. (Grand Rapids, MN); Englund, David J. (Bovey, MN); Iwasaki, Iwao (Grand Rapids, MN); Fosnacht, Donald R. (Hermantown, MN); Brandon, Mark M. (Charlotte, NC); True, Bradford G. (Charlotte, NC)

    2012-01-17T23:59:59.000Z

    A hearth furnace 10 for producing metallic iron material has a furnace housing 11 having a drying/preheat zone 12, a conversion zone 13, a fusion zone 14, and optionally a cooling zone 15, the conversion zone 13 is between the drying/preheat zone 12 and the fusion zone 14. A moving hearth 20 is positioned within the furnace housing 11. A hood or separation barrier 30 within at least a portion of the conversion zone 13, fusion zone 14 or both separates the fusion zone 14 into an upper region and a lower region with the lower region adjacent the hearth 20 and the upper region adjacent the lower region and spaced from the hearth 20. An injector introduces a gaseous reductant into the lower region adjacent the hearth 20. A combustion region may be formed above the hood or separation barrier.

  3. Iron and steel industry process model

    SciTech Connect (OSTI)

    Sparrow, F.T.; Pilati, D.; Dougherty, T.; McBreen, E.; Juang, L.L.

    1980-01-01T23:59:59.000Z

    The iron and steel industry process model depicts expected energy-consumption characteristics of the iron and steel industry and ancillary industries for the next 25 years by means of a process model of the major steps in steelmaking, from ore mining and scrap recycling to the final finishing of carbon, alloy, and stainless steel into steel products such as structural steel, slabs, plates, tubes, and bars. Two plant types are modeled: fully integrated mills and mini-mills. User-determined inputs into the model are as follows: projected energy and materials prices; projected costs of capacity expansion and replacement; energy-conserving options, both operating modes and investments; the internal rate of return required on investment; and projected demand for finished steel. Nominal input choices in the model for the inputs listed above are as follows: National Academy of Sciences Committee on Nuclear and Alternative Energy Systems Demand Panel nominal energy-price projections for oil, gas, distillates, residuals, and electricity and 1975 actual prices for materials; actual 1975 costs; new technologies added; 15% after taxes; and 1975 actual demand with 1.5%/y growth. The model reproduces the base-year (1975) actual performance of the industry; then, given the above nominal input choices, it projects modes of operation and capacity expansion that minimize the cost of meeting the given final demands for each of 5 years, each year being the midpoint of a 5-year interval. The output of the model includes the following: total energy use and intensity (Btu/ton) by type, by process, and by time period; energy conservation options chosen; utilization rates for existing capacity; capital-investment decisions for capacity expansion.

  4. Theoretical Investigation of Hydrogen Adsorption and Dissociation on Iron and Iron Carbide Surfaces Using the ReaxFF Reactive Force Field Method

    SciTech Connect (OSTI)

    Zou, Chenyu; van Duin, Adri C.T.; Sorescu, Dan C.

    2012-06-01T23:59:59.000Z

    We have developed a ReaxFF reactive force field to describe hydrogen adsorption and dissociation on iron and iron carbide surfaces relevant for simulation of Fischer–Tropsch (FT) synthesis on iron catalysts. This force field enables large system (>>1000 atoms) simulations of hydrogen related reactions with iron. The ReaxFF force field parameters are trained against a substantial amount of structural and energetic data including the equations of state and heats of formation of iron and iron carbide related materials, as well as hydrogen interaction with iron surfaces and different phases of bulk iron. We have validated the accuracy and applicability of ReaxFF force field by carrying out molecular dynamics simulations of hydrogen adsorption, dissociation and recombination on iron and iron carbide surfaces. The barriers and reaction energies for molecular dissociation on these two types of surfaces have been compared and the effect of subsurface carbon on hydrogen interaction with iron surface is evaluated. We found that existence of carbon atoms at subsurface iron sites tends to increase the hydrogen dissociation energy barrier on the surface, and also makes the corresponding hydrogen dissociative state relatively more stable compared to that on bare iron. These properties of iron carbide will affect the dissociation rate of H{sub 2} and will retain more surface hydride species, thus influencing the dynamics of the FT synthesis process.

  5. RUSTY OLD STARS: A SOURCE OF THE MISSING INTERSTELLAR IRON?

    SciTech Connect (OSTI)

    McDonald, I.; Zijlstra, A. A.; Markwick, A. J. [Jodrell Bank Centre for Astrophysics, Alan Turing Building, Manchester, M13 9PL (United Kingdom); Sloan, G. C.; Bernard-Salas, J. [Cornell University, Astronomy Department, Ithaca, NY 14853-6801 (United States); Matsunaga, N. [Institute of Astronomy, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015 (Japan); Matsuura, M. [UCL-Institute of Origins, Astrophysics Group, Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT (United Kingdom); Kraemer, K. E., E-mail: iain.mcdonald-2@jb.man.ac.u, E-mail: albert.zijlstra@manchester.ac.u, E-mail: andrew.markwick@manchester.ac.u, E-mail: sloan@isc.astro.cornell.ed, E-mail: matsunaga@ioa.s.u-tokyo.ac.j, E-mail: mikako@star.ucl.ac.u [Air Force Research Laboratory, Space Vehicles Directorate, Hanscom AFB, MA 01731 (United States)

    2010-07-10T23:59:59.000Z

    Iron, the universe's most abundant refractory element, is highly depleted in both circumstellar and interstellar environments, meaning it exists in solid form. The nature of this solid is unknown. In this Letter, we provide evidence that metallic iron grains are present around oxygen-rich asymptotic giant branch stars, where it is observationally manifest as a featureless mid-infrared excess. This identification is made using Spitzer Space Telescope observations of evolved globular cluster stars, where iron dust production appears ubiquitous and in some cases can be modeled as the only observed dust product. In this context, FeO is examined as the likely carrier for the 20 {mu}m feature observed in some of these stars. Metallic iron appears to be an important part of the dust condensation sequence at low metallicity, and subsequently plays an influential role in the interstellar medium. We explore the stellar metallicities and luminosities at which iron formation is observed, and how the presence of iron affects the outflow and its chemistry. The conditions under which iron can provide sufficient opacity to drive a wind remain unclear.

  6. Iron/soot interaction in a laminar ethylene nonpremixed flame

    SciTech Connect (OSTI)

    Zhang, J.; Megaridis, C.M. [Univ. of Illinois, Chicago, IL (United States). Dept. of Mechanical Engineering

    1994-12-31T23:59:59.000Z

    A laminar, coannular, ethylene/air nonpremixed flame doped with ferrocene additive is employed to address the fundamental question of how iron becomes incorporated into the carbonaceous soot phase, thus interfering with the soot formation processes. The structure and chemical composition of individual aggregates are characterized with respect to flame coordinates via a combination of thermophoretic sampling, transmission electron microscopy, and energy dispersive spectrometry. Soot aggregate microstructure clearly reveals iron occlusion, as well as stratification of soot layers over the occluded phase. The study provides physical evidence that the soot and iron compounds combine in the flame to form a hybrid (inhomogeneous) particulate phase. The reported observations are consistent with the hypothesis that ferrocene decomposes early in the combustion process and before the onset of soot particle inception, thus forming a fine aerosol for the subsequent deposition of carbonaceous substances. Examination of a series of inhomogeneous soot aggregates shows that the flame aerosol composition varies with flame coordinates. In particular, aggregates transported in the soot annulus near the luminous flame front are primarily composed of carbon and oxygen, with traces of iron finely dispersed through the aggregate matrix. On the other hand, carbonaceous soot transported at low heights and near the flame axis contains iron in its elemental form. Finally, soot aggregates in all other areas of the flame contain both iron and oxygen, thus implying the possible presence of iron oxides within the carbonaceous matrix.

  7. Iron aluminide alloy coatings and joints, and methods of forming

    DOE Patents [OSTI]

    Wright, R.N.; Wright, J.K.; Moore, G.A.

    1994-09-27T23:59:59.000Z

    Disclosed is a method of joining two bodies together, at least one of the bodies being predominantly composed of metal, the two bodies each having a respective joint surface for joining with the joint surface of the other body, the two bodies having a respective melting point, includes the following steps: (a) providing aluminum metal and iron metal on at least one of the joint surfaces of the two bodies; (b) after providing the aluminum metal and iron metal on the one joint surface, positioning the joint surfaces of the two bodies in juxtaposition against one another with the aluminum and iron positioned therebetween; (c) heating the aluminum and iron on the juxtaposed bodies to a temperature from greater than or equal to 600 C to less than the melting point of the lower melting point body; (d) applying pressure on the juxtaposed surfaces; and (e) maintaining the pressure and the temperature for a time period effective to form the aluminum and iron into an iron aluminide alloy joint which bonds the juxtaposed surfaces and correspondingly the two bodies together. The method can also effectively be used to coat a body with an iron aluminide coating.

  8. Spall behavior of cast iron with varying microstructures

    SciTech Connect (OSTI)

    Plume, Gifford; Rousseau, Carl-Ernst, E-mail: rousseau@uri.edu [Mechanical Engineering, University of Rhode Island, 92 Upper College Rd., Kingston, Rhode Island 02881 (United States)

    2014-07-21T23:59:59.000Z

    The spall strength of cast iron with varying microstructures has been investigated using plate impact at moderate speed. Stress history measurements were made with manganin stress gauges embedded between the back face of the specimen and a low impedance polycarbonate backing. Five separate cast irons were tested. Four of these consisted of gray cast iron with graphite in flake form, with three classified as Type VII A2 and the fourth containing a bimodal distribution of Types VII A4 and VII D8. The fifth casting consisted of ductile cast iron with graphite in nodular form, classified as Type I, size class 5. The spall strength for the Type VII A2 gray cast irons varied between 40 and 370?MPa, and that of the additional gray cast iron, between 410 and 490?MPa. The spall strength of the ductile cast iron fell within the range of 0.94–1.2?GPa. It is shown that the spall strength is linked to the damage level at the spall plane, where an increased level of tensile stress is required to generate higher levels of damage. Post mortem analysis was performed on the recovered samples, revealing the graphite phase to be the primary factor governing the spall fracture of cast irons, where crack nucleation is directly correlated to the debonding of graphite from the metal matrix. The average length of graphite found within a casting is linked to the material's strength, where strength increases as a function of decreasing length. The morphology and mean free path of graphite precipitates further govern the subsequent coalescence of initiated cracks to form a complete fracture plane. In cases where graphite spacing is large, increased energy level is required to complete the fracture process. A secondary factor governing the spall fracture of cast irons has also been linked to the microstructure of the metal matrix, with pearlite yielding higher spall strengths than free ferrite.

  9. MAGNESIUM ISOTOPE EVIDENCE FOR SINGLE STAGE FORMATION OF CB CHONDRULES BY COLLIDING PLANETESIMALS

    SciTech Connect (OSTI)

    Olsen, Mia B.; Schiller, Martin; Krot, Alexander N.; Bizzarro, Martin [Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, Copenhagen DK-1350 (Denmark)] [Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, Copenhagen DK-1350 (Denmark)

    2013-10-10T23:59:59.000Z

    Chondrules are igneous spherical objects preserved in chondritic meteorites and believed to have formed during transient heating events in the solar protoplanetary disk. Chondrules present in the metal-rich CB chondrites show unusual chemical and petrologic features not observed in other chondrite groups, implying a markedly distinct formation mechanism. Here, we report high-precision Mg-isotope data for 10 skeletal olivine chondrules from the Hammadah al Hamra 237 (HH237) chondrite to probe the formation history of CB chondrules. The {sup 27}Al/{sup 24}Mg ratios of individual chondrules are positively correlated to their stable Mg-isotope composition (?{sup 25}Mg), indicating that the correlated variability was imparted by a volatility-controlled process (evaporation/condensation). The mass-independent {sup 26}Mg composition (?{sup 26}Mg*) of chondrules is consistent with single stage formation from an initially homogeneous magnesium reservoir if the observed ?{sup 25}Mg variability was generated by non-ideal Rayleigh-type evaporative fractionation characterized by a ? value of 0.5142, in agreement with experimental work. The magnitude of the mass-dependent fractionation (?300 ppm) is significantly lower than that suggested by the increase in {sup 27}Al/{sup 24}Mg values, indicating substantial suppression of isotopic fractionation during evaporative loss of Mg, possibly due to evaporation at high Mg partial pressure. Thus, the Mg-isotope data of skeletal chondrules from HH237 are consistent with their origin as melts produced in the impact-generated plume of colliding planetesimals. The inferred ?{sup 26}Mg* value of –3.87 ± 0.93 ppm for the CB parent body is significantly lower than the bulk solar system value of 4.5 ± 1.1 ppm inferred from CI chondrites, suggesting that CB chondrites accreted material comprising an early formed {sup 26}Al-free component.

  10. Notice of Construction for the Magnesium Hydroxide Precipitation Process at the Plutonium Finishing Plant (PFP)

    SciTech Connect (OSTI)

    JANSKY, M.T.

    1999-12-01T23:59:59.000Z

    The following description and any attachments and references are provided to the Washington State Department of Health (WDOH), Division of Radiation Protection, Air Emissions & Defense Waste (WAC) 246-247, Radiation Protection-Air Emissions. The WAC 246-247-060, ''Applications, registration, and licensing'', states ''This section describes the information requirements for approval to construct, modify, and operate an emission unit. Any NOC requires the submittal of information listed in Appendix A.'' Appendix A (WAC 246-247-1 10) lists the requirements that must be addressed. Additionally, the following description, attachments and references are provided to the US Environmental Protection Agency (EPA) as an NOC, in accordance with Title 40, Code of Federal Regulations (CFR), Part 61, ''National Emission Standards for Hazardous Air Pollutants.'' The information required for submittal to the EPA is specified in 40 CFR 61.07. The potential emissions from this activity are estimated to provide greater than 0.1 millirem per year total effective dose equivalent (TEDE) to the hypothetical offsite maximally exposed individual (MEI), and commencement is needed within a short time. Therefore, this application also is intended to provide notification of the anticipated date of initial startup in accordance with the requirement listed in 40 CFR 61.09(a)(1), and it is requested that approval of this application also will constitute EPA acceptance of this initial startup notification. Written notification of the actual date of initial startup, in accordance with the requirement listed in 40 CFR 61.09(a)(2) will be provided at a later date. This NOC covers the activities associated with the Construction and operation activities involving the magnesium hydroxide precipitation process of plutonium solutions within the Plutonium Finishing Plant (PFP).

  11. Iron-carbon compacts and process for making them

    DOE Patents [OSTI]

    Sheinberg, Haskell (Santa Fe, NM)

    2000-01-01T23:59:59.000Z

    The present invention includes iron-carbon compacts and a process for making them. The process includes preparing a slurry comprising iron powder, furfuryl alcohol, and a polymerization catalyst for initiating the polymerization of the furfuryl alcohol into a resin, and heating the slurry to convert the alcohol into the resin. The resulting mixture is pressed into a green body and heated to form the iron-carbon compact. The compact can be used as, or machined into, a magnetic flux concentrator for an induction heating apparatus.

  12. Iron is the Key to Preserving Dinosaur Soft Tissue

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes | NationalCurriculum IntroductionInvestor14,566 SiteIronIronIron

  13. Iron is the Key to Preserving Dinosaur Soft Tissue

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12 Investigation Peer Review 2012IowaFebruaryIronIronIron

  14. Snapshot of iron response in Shewanella oneidensis by gene network reconstruction

    E-Print Network [OSTI]

    Harris, Daniel P.

    2010-01-01T23:59:59.000Z

    dissection of the Helicobacter pylori Fur regulatory circuitregulation of the Helicobacter pylori iron-cofactored

  15. Synthesis and characterization of iron-impregnated porous carbon spheres prepared by ultrasonic spray pyrolysis

    E-Print Network [OSTI]

    Suslick, Kenneth S.

    applications for iron nanoparticles include Fischer­Tropsch catalysts, oxygen reduction catalysts in fuel cells

  16. Wintertime pytoplankton bloom in the Subarctic Pacific supported by continental margin iron

    E-Print Network [OSTI]

    Lam, Phoebe J.; Bishop, James K.B.; Henning, Cara C.; Marcus, Matthew A.; Waychunas, Glenn A.; Fung, Inez

    2008-01-01T23:59:59.000Z

    of iron hydroxide (60% goethite) and amorphous irona linear combination of goethite (60%) and ferrihydrite (

  17. Decoupling of iron and phosphate in the global ocean

    E-Print Network [OSTI]

    Parekh, Payal

    2003-01-01T23:59:59.000Z

    Iron (Fe) is an essential micronutrient for marine phytoplankton often limiting phytoplankton growth due to its low concentration in the ocean and thus playing a role in modulating the ocean's biological pump. In order to ...

  18. Evidence for a Weak Iron Core at Earth's Center

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Iron Core at Earth's Center Print Seismic waves that pass through the center of the Earth travel faster going from pole to pole than along the equatorial plane-why? One theory...

  19. Iron Cycling and Redox Evolution in the Precambrian

    E-Print Network [OSTI]

    Planavsky, Noah John

    2012-01-01T23:59:59.000Z

    in a greater enrichment in the lighter Fe isotopes in theIron isotopes provide evidence that Fe enrichment in IF is2003). This enrichment in heavy Fe isotopes contrasts with

  20. In Situ Iron Oxide Emplacement for Groundwater Arsenic Remediation 

    E-Print Network [OSTI]

    Abia, Thomas Sunday

    2012-02-14T23:59:59.000Z

    Iron oxide-bearing minerals have long been recognized as an effective reactive media for arsenic-contaminated groundwater remediation. This research aimed to develop a technique that could facilitate in situ oxidative precipitation of Fe3+ in a soil...